Consulta: subjectFacets:"Temperature"
Registros recuperados: 473
Data/hora: 07/06/2024 01:13:24

CARACTERIZAÇÃO MICROMETEOROLÓGICA DE AMBIENTES PROTEGIDOS PARA A PRODUÇÃO VEGETAL
Provedor de dados: 196
Autores: Silva, Abimael Gomes da; Costa, Edilson; Zoz, Tiago; Binotti, Flávio Ferreira da Silva.
This study evaluates the influence of the four seasons and twelve months of the year on the micrometeorological variables of global solar radiation, air temperature, and relative air humidity in different protected environments for plant production. The protected environment types and the characteristics of the shade screen modify the indoor air temperature. This environment provides greater relative humidity. The global solar radiation percentages in the environments were: full sun (100%); black screen with 30% shading (47.3%); greenhouse with LDPE + 22-30% shading screen under the film (38.1%); aluminized screen with 35% shading (36.9%) and greenhouse with LDPE + 42-50% shading screen under the film (26.9%). The micrometeorological conditions of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solar radiation; Temperature; Relative humidity; Radiação solar; Temperatura; Umidade Relativa.
Ano: 2021
URL: http://periodicosonline.uems.br/index.php/agrineo/article/view/6177

Diseño de un sistema de telemetría para varialbes climatológicas y humedad del sustrato en invernadero.
Provedor de dados: 32
Autores: Gardea Flores, Carlos Alberto.
Se diseñó un sistema electrónico de telemetría, basado en microcontroladores PIC como centro de procesamiento y transceptores LINX de comunicación inalámbrica, para el monitoreo de humedad relativa, temperatura y humedad del sustrato en invernadero. El sistema cuenta con un módulo central que coordina las mediciones y almacena los datos de cinco unidades remotas que contienen los sensores. Como parte del software se implementó un protocolo de comunicación bidireccional que permite el control y flujo de información entre los dispositivos. La verificación de los sensores se realizó comparando las mediciones de éstos con las tomadas por la estación agrometeorológica del Colegio de Postgraduados Campus Montecillo. El funcionamiento del equipo se validó en el...
Palavras-chave: Telemetría; Comunicación inalámbrica; Electrónica; Microcontrolador; Temperatura; Humedad; Invernadero; Telemetry; Wireless; Communication; Electronics; Microcontroller; Temperature; Humidity; Greenhouse.
Ano: 2010
URL: http://hdl.handle.net/10521/148

Interacción genotipo-ambiente sobre la producción de litchi en las regiones centro y norte del estado de Veracruz.
Provedor de dados: 32
Autores: Aguas Atlahua, Aristarco.
El cultivo de litchi (Litchi Chinensis Sonn.) presenta fuerte alternancia de producción, ya que se estableció en diferentes zonas sin considerar los requerimientos climáticos de la especie. El objetivo fue evaluar la interacción genotipo-ambiente, en las fases de floración y fructificación, conocer las prácticas de manejo y determinar la calidad de fruto en huertas de litchi de la zona centro y norte del estado de Veracruz. Se seleccionaron seis huertas representativas, cinco con el cv ‘Mauritius’ y una con el cv ‘Brewster’. Se marcaron 10 árboles para contar brotes florales y vegetativos. Se registró la temperatura media diaria y se utilizó un diseño completamente al azar con cinco repeticiones. Se registraron las siguientes variables: floración,...
Palavras-chave: Litchi chinensis; Genotipo-ambiente; Temperatura; Producción; Calidad del fruto; Genotype-environment; Temperature; Flowering; Production; Fruit quality; Agroecositemas Tropicales; Maestría; Floración.
Ano: 2012
URL: http://hdl.handle.net/10521/1840

Fluctuación poblacional de Aeneolamina postica (Walker) (Hemiptera: Cercopidae) en la zona productora de caña de azúcar
Provedor de dados: 32
Autores: Olan Hernández, José Francisco.
En el estado de Tabasco existen alrededor de 27,041 ha de caña de azúcar (Saccharum officinarum L), cuya producción está destinada para la industria azucarera. Entre los problemas fitosanitarios que limitan la producción del cultivo destaca la especie Aeneolamia postica (Walker) que ocasiona reducciones de hasta el 60% en los rendimien tos. La presente investigación tuvo como objetivo conocer la fluctuación poblacional de ninfas y adultos de  A. postica durante un año en la zona productora de caña de azúcar de la Chontalpa, Tabasco, El estudio se desarrolló mediante muestreos semanales de noviembre de 2007 a octubre de 2008 en una plantación de caña de una hectárea, de la variedad CP722086, en el ciclo de resoca, localizada a la altura del km 21 de la...
Tipo: Tesis
Palavras-chave: Saccharum officinarum; Aeneolamia postica; Precipitación; Temperatura; Saccharum officinarum; Aeneolamia postica; Precipitation; Temperature.
Ano: 2009
URL: http://hdl.handle.net/10521/1614

Fluctuación poblacional de Aeneolamia postica (Walker) (Hemiptera: Cercopidae) en la zona productora de caña de azúcar (Saccharum officinarum L.) de la Chontalpa Tabasco
Provedor de dados: 32
Autores: Olán Hernández, José Francisco.
En el estado de Tabasco existen alrededor de 27,041 ha de caña de azúcar  (Saccharum officinarum L), cuya producción está destinada para la industria azucarera.  Entre los problemas fitosanitarios que limitan la producción del cultivo destaca la  especie Aeneolamia postica (Walker) que ocasiona reducciones de hasta el 60% en los  rendimientos. La presente investigación tuvo como objetivo conocer la fluctuación  poblacional de ninfas y adultos de  A. postica durante un año en la zona productora de  caña de azúcar de la Chontalpa, Tabasco, El estudio se desarrolló mediante muestreos  semanales de noviembre de 2007 a octubre de 2008 en una plantación de caña de una  hectárea, de la variedad CP722086, en el ciclo de resoca, localizada a la altura del km  21 de...
Tipo: Tesis
Palavras-chave: Saccharum officinarum; Aeneolamia postica; Precipitación; Temperatura; Maestría; Producción Agroalimentaria en el Trópico; Precipitation; Temperature.
Ano: 2009
URL: http://hdl.handle.net/10521/1288

Diseño de un sistema de telemetría para varialbes climatológicas y humedad del sustrato en invernadero.
Provedor de dados: 32
Autores: Gardea Flores, Carlos Alberto.
Se diseñó un sistema electrónico de telemetría, basado en microcontroladores PIC como centro de procesamiento y transceptores LINX de comunicación inalámbrica, para el monitoreo de humedad relativa, temperatura y humedad del sustrato en invernadero. El sistema cuenta con un módulo central que coordina las mediciones y almacena los datos de cinco unidades remotas que contienen los sensores. Como parte del software se implementó un protocolo de comunicación bidireccional que permite el control y flujo de información entre los dispositivos. La verificación de los sensores se realizó comparando las mediciones de éstos con las tomadas por la estación agrometeorológica del Colegio de Postgraduados Campus Montecillo. El funcionamiento del equipo se validó en el...
Palavras-chave: Telemetría; Comunicación inalámbrica; Electrónica; Microcontrolador; Temperatura; Humedad; Invernadero; Telemetry; Wireless; Communication; Electronics; Microcontroller; Temperature; Humidity; Greenhouse.
Ano: 2010
URL: http://hdl.handle.net/10521/148

Temperatura, humedad relativa y luz para almacenamiento de tallos florales de Heliconia psittacorum L. f. cv. Trópica.
Provedor de dados: 32
Autores: Bañuelos Hernández, Karina Patricia.
La especie Heliconia psittacorum L. f. cv. Trópica se ha identificado en los últimos años como una  ornamental tropical con gran demanda debido a su belleza y a  su vida postcosecha prolongada, que puede superar los 15 días; sin embargo, se desconoce el manejo postcosecha adecuado durante su comercialización. El objetivo de este estudio fue identificar las condiciones adecuadas para el almacenamiento postcosecha de tallos florales de H. psittacorum L. f. cv. Trópica. Se postula que la combinación adecuada de temperatura, H.R. y luz contribuirían a conservar la calidad de las inflorescencias durante la comercialización. Los tallos florales evaluados se obtuvieron de una plantación comercial en Campo Chico, municipio de Iztaczoquitlán, Veracruz. Inicialmente...
Palavras-chave: Almacenamiento; Heliconia; Trópica; Humedad relativa; Luz; Temperatura; Light; Relative humidity; Storage; Temperature; Botánica; Maestría.
Ano: 2012
URL: http://hdl.handle.net/10521/1745

Climate and Tickborne Encephalitis
Provedor de dados: 7
Autores: Lindgren, Elisabet; Stockholm University; elisa@system.ecology.su.se.
Climatic changes are projected to alter the abundance, dynamics, and geographical distribution of many vector-borne diseases in human populations. Tick-borne diseases such as Lyme disease and tick-borne encephalitis (TBE) are a growing concern in northern Europe and the United States. The impact of a future climate change on the transmission of tick-borne diseases is not known. To make such assumptions, more empirical data are needed on the relations between short-term fluctuations in contemporary weather and disease incidence. This paper analyzes relations between daily minimum and maximum temperatures, monthly precipitation, and TBE incidence during a 36-yr period in Stockholm County, a high-endemic region for TBE in Sweden. Multiple regression analyses...
Tipo: Peer-Reviewed Reports
Palavras-chave: Encephalitis; Tickborne; Tickborne diseases; Temperature; Climate; Ticks.
Ano: 1998

Spatial and temporal trends in the distribution of macronutrients in surface waters of the Drake Passage
Provedor de dados: 67
Autores: Paparazzo,Flavio E.; Alder,Viviana A.; Schloss,Irene R.; Bianchi,Alejandro; Esteves,Jose L.
The Drake Passage (DP) links the Southern Pacific and Atlantic Oceans, and acts as a physical narrowing for the largest current of the World Ocean, the Antarctic Circumpolar Current (ACC). This result in a constriction of the main circumpolar fronts related to the ACC: the Subantarctic Front, the Polar Front, the Southern Antarctic Circumpolar Current Front and the Continental Water Boundary Front. Previous studies showed that the DP is a high-nutrient low-chlorophyll (HNLC) region, but studies on the interannual and seasonal macronutrients' fluctuations in relation with chlorophyll and frontal areas in the DP are scarce. This study analyzes the spatial and temporal trends of nitrate, phosphate, and silicate on surface samples from 113 oceanographic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nitrate; Phosphate; Silicate; Chlorophyll-a; Temperature; Salinity; Antarctic fronts; Antarctic zones; Seasonal variation; Interannual variation.
Ano: 2016
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1667-782X2016000100004

Physiological-enzymatic characteristics and inoculation of mycelial strains of Descolea antarctica Sing. in Nothofagus seedlings
Provedor de dados: 69
Autores: Valenzuela,Eduardo; Hipp,Joseline; Alonso,Claudia; Godoy,Roberto; Alberdi,Miren; Alvarez,Maricel; Saavedra,Isabel.
At present, reforestation has focused on native forests with anthropogenic intervention and eroded soils. There is interest in producing Nothofagus seedlings which can overcome adverse conditions encountered on reforestation sites. It is necessary to find new fungi that can be utilized as mycorrhizal inoculants and that enable the seedlings to increase their tolerance to adverse conditions. Two ectomycorrhizal strains of the fungus Descolea antarctica (D1 and D2) were cultured at different temperatures, pH levels and the activities of amylases, cellulases, and phosphatases were determined. In greenhouse and nursery trials, the growth responses of inoculated Nothofagus obliqua seedlings were evaluated. D1 and D2 exhibited the highest growth rates at 23ºC....
Tipo: Journal article
Palavras-chave: Cellulose; Ectomycorrhizal fungi; Nothofagus; PH; Phosphatase; Temperature.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000200012

Fermentation technologies for the production of exopolysaccharide-synthesizing Lactobacillus rhamnosus concentrated cultures
Provedor de dados: 69
Autores: Champagne,Claude P; Gardner,Nancy J; Lacroix,Christophe.
The exopolysaccharide (EPS)-producing cultures such as Lactobacillus rhamnosus RW-9595M present a challenge for the culture producers because the high viscosity of the fermented growth medium makes it difficult to recover the cells by centrifugation or filtration. This study examined four approaches to reduce viscosity of the medium while producing high cell densities: incubation temperature, extended incubation in the stationary growth phase, production in alginate gel beads and fed-batch fermentation technology. Automated spectrophotometry (AS) was used to study the effects of temperature, pH and lactate level on growth of the strain. In AS assays, there was no significant difference in final maximal biomass production at temperatures ranging between...
Tipo: Journal article
Palavras-chave: Alginate beads; Fed-batch culture; Temperature.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000200005

Effects of temperature on the sorption of Pb2+ and Cd2+ from aqueous solution by Caladium bicolor (Wild Cocoyam) biomass
Provedor de dados: 69
Autores: Horsfall Jnr,Michael; Spiff,Ayebaemi I.
This report is based on the investigation of the effect of temperature on the removal of Pb2+ and Cd2+ in aqueous effluent using C. bicolor biomass in a batch sorption process. The result showed that the most suitable sorption temperature was 40ºC with maximum sorption capacities of 49.02 mg/g and 52.63 mg/g for Pb2+ and Cd2+ respectively. Various thermodynamic parameters, such as &amp;#916;Gº, &amp;#916;Hº, &amp;#916;Sº and Ea have been calculated. The data showed that the sorption process is spontaneous and exothermic in nature and that lower solution temperatures favours metal ion removal by the biomass. The findings of this investigation suggest that physical sorption plays a role in controlling the sorption rate. The sticking probability model was...
Tipo: Journal article
Palavras-chave: Biosorption; Cocoyam; Heavy metals removal; Temperature; Thermodynamics of sorption; Waste management.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582005000200005

Impact of different light sources on broiler rearing environment
Provedor de dados: 70
Autores: Lima,Karla A. O.; Nääs,Irenilza de A.; Garcia,Rodrigo G.; Borille,Rodrigo; Caldara,Fabiana R.
Broiler production is highly dependent on the use of artificial light. The light source may affect the effectiveness of housing conditions due to increasing ambient temperature and concentration of noxious gases. This research aimed to evaluate the effects of different bulb types on the thermal, aerial, and acoustic environment of broiler aviaries. The experiment was carried out at a commercial broiler farm in Dourados, Mato Grosso do Sul State, Brazil. Three aviaries were used, and two flocks of male broilers from Cobb® genetic strain were reared from the first day to slaughter. Each aviary was equipped with a different light source, comprising the adopted treatments (A1 - incandescent light bulb, control; A2 - sodium vapor light bulb; A3 - fluorescent...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Poultry industry; Gas concentration; Lighting; Temperature.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000300006

INFLUENCE OF EXPOSURE TIME TO OPERATING TEMPERATURE ON SHEAR STRENGTH OF WOOD USED IN ROOF STRUCTURES
Provedor de dados: 70
Autores: Christoforo,André L.; Almeida,Tiago H. de; Almeida,Diego H. de; Balanco,Giovana G.; Lahr,Francisco A. R.
ABSTRACT Wood is one of the main materials used in the constructing of covering structures (roofs) because of its versatility. Under this situation, due to solar radiation incidence, the temperature can exceed 60 °C and, such as other environmental conditions, influence the mechanical properties of the wood in use. The aim of this research was to study the influence of exposure time of the wood of four different hardwood species at a temperature of 60 °C on the shear strength parallel to fibers. The wood of the following species was used: Cupiúba (Goupia glabra), Eucalyptus (Eucalyptus saligna), Garapeira (Apuleia leiocarpa), and Jatobá Tamarindo (Hymenaea sp.). In order to investigate the effect of exposure time (0, 168, 456, 720, and 2160 hours) of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hardwoods; Mechanical properties; Roofs; Temperature.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162019000300365

Internal ambience of beehives Apis mellifera with different colors and roofing materials in the sub middle of the São Francisco Valley
Provedor de dados: 70
Autores: Souza,Maria de F. P; Turco,Silvia H. N.; Silva,Eva M. S; Costa,Daniel dos S; Freire,Murilo S.
ABSTRACT The current study aimed to evaluate the influence of three colors and two types of roofing materials under the internal temperature of bee colonies Apis mellifera. The experiment was conducted at the Agricultural Sciences Campus at the Federal University of Sao Francisco Valley located in Petrolina-PE, in November and December 2013, using 24 colonies housed in Langstroth hives. The experiment was a completely randomized factorial design (3x2) with three colors of box (blue, white, and traditional) and two types of cover (with and without the use of plaster) with six treatments and four replications. The internal temperature dates of the colonies were hourly recorded, during 24 hours, and surface temperatures were hourly recorded between 08h00 and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Thermal comfort; Insects; Temperature.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162015000400625

Experimental dryer design for agricultural products
Provedor de dados: 70
Autores: GONELI,ANDRÉ L. D.; MARTINS,ELTON A. S.; JORDAN,RODRIGO A.; GEISENHOFF,LUCIANO O.; GARCIA,RENATO T.
ABSTRACT This study consisted of designing and building an experimental dryer that allows working with different temperatures and velocities of the air, aiming to perform studies on thin- and thick-layer drying of agricultural products. The project was divided into three stages: heat source designing, dryer geometric parameters, and fan selection to meet operational demand. Heating was made by a set of six electrical resistances totaling 12 kW and the drying bed in thin layer was composed of two trays with diameter of 0.20 m. Operational demands were met using a centrifugal fan with a power rating of 735.5 W. The used methodology was able to size the experimental dryers for thin- and thick-layer drying working at distinct temperatures and air velocities.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Thin layer; Electrical resistance; Temperature; Air velocity.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162016000500938

MATHEMATICAL MODELING AND HYSTERESIS OF SORPTION ISOTHERMS FOR PADDY RICE GRAINS
Provedor de dados: 70
Autores: Zeymer,Juliana S.; Corrêa,Paulo C.; Oliveira,Gabriel H. H.; Baptestini,Fernanda M.; Campos,Renata C.
ABSTRACT Knowledge on sorption isotherms is important for predicting drying and storage processes of a product. A sorption isotherm can be generated from two processes: desorption and adsorption. The lag between these two curves is called hysteresis. Static method was used to obtain the equilibrium moisture content of paddy rice grains, in different temperature (10, 20, 30, 40 and 50 ± 1°C) and relative humidity (between 11 and 76% ± 2%) conditions. Equilibrium moisture content data were correlated with eight mathematical models and. The Chung Pfost model had the best fit to the experimental data. Desorption and adsorption isotherms, represented by the Chung Pfost model, showed a sigmoidal shape, characteristic of type II curve. Equilibrium moisture...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Adsorption; Desorption; Hygroscopic equilibrium; Relative humidity; Temperature.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162019000400524

Soluble malate dehydrogenase of Geophagus brasiliensis (Cichlidae, Perciformes): isolated isoforms and kinetics properties
Provedor de dados: 74
Autores: Aquino-Silva,Maria Regina de; Schwantes,Maria Luiza Barcellos; Munin,Flavia Simone; Schwantes,Arno Rudi; Santos,Silvana Pereira dos.
Kinetic properties and thermal stabilities of Geophagus brasiliensis skeletal muscle unfractionated malate dehydrogenase (MDH, EC 1.1.1.37) and its isolated isoforms were analyzed to examine a possible sMDH-B* locus duplication in a fixation process influenced by genetic drift. Two optimal pHs were detected: 7.5 for AB1 unfractionated muscle phenotype and its B1 isoform, and 8.0 for AB1B2 unfractionated muscle phenotype, A and B2 isoforms. While G. brasiliensis A isoform could be characterized as thermostable, the duplicated B isoform cannot be assumed as thermolabile. Km values for isolated B2 isoforms were 1.6 times lower than for B1. A duplication event in progress best explains the electrophoretic six-band pattern detected in G. brasiliensis, which...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gene duplication; SMDH; Substrate concentration; Temperature; PH isoforms.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000200029

Chromosomal inversion polymorphism in Drosophila mediopunctata: seasonal, altitudinal, and latitudinal variation
Provedor de dados: 74
Autores: Ananina,Galina; Peixoto,Alexandre A.; Bitner-Mathé,Blanche C.; Souza,Wilma N.; Silva,Luciano Basso da; Valente,Vera L.S.; Klaczko,Louis B.
The most polymorphic chromosome for inversions in Drosophila mediopunctata is the chromosome II, where 17 inversions have been found, eight of which occurring in the distal region and nine in the proximal region. We present an analysis of the chromosome II inversion polymorphism with respect to seasonal, altitudinal and latitudinal variation. In D. mediopunctata from the Parque Nacional do Itatiaia (southeastern Brazil), the frequencies of three of the distal inversions (namely DA, DS, and DP) vary seasonally. These inversions also show altitudinal clines in their frequencies. This microgeographic pattern was not observed on a macrogeographic scale. D. mediopunctata from Porto Alegre are less polymorphic for inversions than other populations, the most...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cline; Microgeographic variation; Temperature; Tripunctata group; Brazil.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572004000100011

Potential of rosemary leaves and branches to enhance storage life of onion bulbs
Provedor de dados: 75
Autores: Bina,Fatemeh; Bostani,Abdolamir; Talei,Daryush.
ABSTRACT Although its importance as vegetable, a considerable amount of onion bulbs is lost in storage. That's why storage condition is one of the most important issues to maintain post-harvest quality. For this purpose, a factorial experiment based on randomized complete block design with two factors and three replicates was carried out. The factors were storage conditions of onion bulbs with five levels (4oC in the seed storage apparatus, 25 and 30oC without using rosemary leaves and branches in the incubator, and 25 and 30oC using rosemary leaves and branches in the incubator) and storage times with ten levels (10 consecutive weeks). The storage feedbacks of bulbs in terms of the weight loss (WL) and the average bud length (ABL) of bulbs were analyzed....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allium cepa; Rosmarinus officinalis; Temperature; Sprouting; Storage life.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362016000300381

Physiological and quality attributes associated with different centrifugation times of baby carrots
Provedor de dados: 75
Autores: Moretti,Celso Luiz; Mattos,Leonora Mansur; Machado,Cristina MM; Kluge,Ricardo Alfredo.
Centrifugation is one of the most important steps in the fresh-cut industry. Inadequate centrifugation can lead to increased white blush in baby carrots. The present work was carried out aiming at evaluating the effects of different centrifugation times in baby carrots physiological and quality attributes. Carrot roots cv. Alvorada were harvested and minimally processed as baby carrots. After processing, samples were placed in nylon bags and centrifuged (378 rad. s-1) for 0; 30; 60; 90, and 120 seconds. Temperature of baby carrots centrifuged for 120 seconds was 63% higher than the temperature at the beginning of the experiment. Respiratory activity increased 49% when centrifugation time increased from 30 to 120 seconds. Ethylene evolution remained around...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Daucus carota; Total carotenoids; Color; Postharvest; Temperature; White blush.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362007000400012

Hydroponic rocket salad growth and production according to different color profiles
Provedor de dados: 75
Autores: Schmidt,Denise; Gabriel,Vilson J; Caron,Braulio O; Souza,Velci Q; Boscaini,Ricardo; Pinheiro,Renes R; Cocco,Carine.
ABSTRACT The aim of this study was to evaluate the influence of different profile colors based on nutrient flux on microclimate, growth and yield of four rocket cultivars. The experiment was conducted during four months in a protected environment in the NLT system, which consisted of benches composed of eight hydroponic profiles for the plants conduction. The treatments were arranged in a 4x2x2 factorial design, with four cultivars (Cultivada, Folha Larga, Rococo and Runway), two color profiles (black and white) and two growing seasons (autumn and winter). The experiments were conducted in a randomized block design with three replications. The evaluations were realized on every four days, throughout the growth period. Leaves fresh and dry mass, stems and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eruca sativa; NLT; Temperature; Dry mass; Yield.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362017000100111

Cooling and concentration of nutrient solution in hydroponic lettuce crop
Provedor de dados: 75
Autores: Cometti,Nilton N; Bremenkamp,Diene M; Galon,Karla; Hell,Leonardo R; Zanotelli,Marinaldo F.
The study was conducted in greenhouse at horticulture department of the Instituto Federal do Espírito Santo, Campus Itapina, Colatina, northwestern Espírito Santo state, Brazil, with the objective of evaluating the effect of cooling and electrical conductivity of nutrient solution on growth and development of lettuce cv. Vitória de Santo Antão in hydroponics. The study was conducted in a completely randomized design with two factors (control of the maximum temperature of the nutrient solution: 26ºC and without control; and electrical conductivity, EC, of the solution: 1, 2 and 3 dS m-1) with three repetitions. The plants were harvested fifty-two days after sowing (DAS). We evaluated the dry and fresh mass of leaves, stems and roots, stem and root length,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lactuca sativa; Greenhouse; Temperature.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362013000200018

Phytoplankton carbon to chlorophyll a ratio:  response to light, temperature and nutrient
Provedor de dados: 13
Autores: Finenko, Z. Z.; Hoepffner, N.; Williams, R.; Piontkovski, S. A.
Выполнено обобщение литературных и собственных экспериментальных данных по действию света, темпе-ратуры и биогенных элементов на отношение углерод-хлорофилл а в клетках 36 видов водорослей из 7 так-сономических групп. При одинаковых условиях средние значения С:Хл. отношения для отдельных таксоно-мических групп увеличиваются в следующем порядке: Chlorophyceae &lt; Bacillariophyceae, Prochlorococcus &lt; Prymnesiophyceae &lt; Cyanophyceae &lt; Dinophyceae. При постоянной температуре С:Хл. отношение повышается линейно с увеличением света и уменьшается экспоненциально с ростом температуры при одинаковой интен-сивности света. Комбинированное действие света и температуры на С:Хл. отношение у всех исследованных водорослей описано одним уравнением с 3...
Tipo: Journal Contribution
Palavras-chave: Углерод: хлорофилл а отношение; Свет; Температура; Биогенное лимитирование; Фотоадаптация; Микроводоросли; Carbon:chlorophyll a ratio; Light; Temperature; Nutrient-limitation; Photoacclimation; Microalgae Temperature Light Light Temperature http://aims.fao.org/aos/agrovoc/c_4322 http://aims.fao.org/aos/agrovoc/c_7657.
Ano: 2003
URL: http://repository.ibss.org.ua/dspace/handle/99011/38

Воздействие глобальных климатических и региональных  факторов на мелких пелагических рыб Чёрного  моря.
Provedor de dados: 13
Autores: Шульман, Г. Е.; Никольский, В. Н.; Юнева, Т. В.; Щепкина, А. М.; Бат, Л.; Кидейш, А. Е.
Рассмотрена многолетняя динамика содержания жира у шпрота и анчоуса Чёрного моря как индикаторов обеспеченности пищей в связи с температурой воды, концентрацией фитопланктона, величинами запасов и уловов этих рыб. Глобальным климатическим фактором, оказывающим прямое и косвенное влияние на обеспеченность мелких пелагических рыб Чёрного моря пищей, является температура. Региональные факторы, воздействующие на состояние шпрота и анчоуса, – пищевая конкуренция, речной сток и загрязнение водной среды.
Tipo: Journal Contribution
Palavras-chave: Шпрот; Анчоус; Содержание жира; Обеспеченность пищей; Температура; Конкуренция; Фитопланктон; Запасы и уловы; Чёрное море; Sprat; Anchovy; Fat content; Food supply; Temperature; Competition; Phytoplankton; Stocks and yields; Black Sea; Камса; Вміст жиру; Забезпеченість їжею; Конкуренція; Фітопланктон; Вилови; Чорне море.
Ano: 2007
URL: http://repository.ibss.org.ua/dspace/handle/99011/854

Anchovies of the Sea of Azov and The Black Sea: Regularities of wintering migrations (Brief review)
Provedor de dados: 13
Autores: Shulman, G. E.
Close relation between internal (level of fat stores) and external (temperature fall) impulses of wintering migration of Azov and Black Sea anchovies Engraulis encrasicolus maeoticus and E. e. ponticus (“dosage principle”) was revealed. Schools with high fatness begin migration at more high temperature than that ones with low fatness. Intensity of migration also correlates with level of fatness. Regularities obtained may be used for study of wintering migration of other truly marine fishes.
Tipo: Journal Contribution
Palavras-chave: Anchovy; Migrations; Fat; Temperature; Анчоус; Миграции; Жир; Температура.
Ano: 2002
URL: http://repository.ibss.org.ua/dspace/handle/99011/143

Diversity and Variability of the Cорероd Behaviour in Environmental Gradients: an Overview
Provedor de dados: 13
Autores: Seregin, S. A.; Piontkovski, S. A.
The overview is based on results of long-term experimental studies оf the authors and literature data, and applies to copepod species from plankton of the Black Sea, the Mediterranean Sea and the Atlantic Ocean. The work has incorporated the analysis of diversity and variability of the locomotory acts under the impact of abiotic factors: light, temperature, salinity, and the turbulent diffusion. Variability of locomotory activity depending on intensity, orientation (for the scalar factors), from a various combination of the environmental factors is shown. One of the mechanisms of a preferred conditions selection and phenomenon of a polymodality of copepod distribution in gradient conditions of environment is analyzed on an example of Acartia clausi...
Tipo: Journal Contribution
Palavras-chave: Diversity; Copepod behaviour; Light; Temperature; Salinity; Turbulent diffusion; Pазнообразие; Поведение копепод; Свет; Температура; Соленость; Турбулентная диффузия Light Temperature Salinity Turbulent diffusion Light Temperature Salinity http://aims.fao.org/aos/agrovoc/c_4322 http://aims.fao.org/aos/agrovoc/c_7657 http://aims.fao.org/aos/agrovoc/c_6751.
Ano: 2003
URL: http://repository.ibss.org.ua/dspace/handle/99011/148

Effect of temperature on the survival and growth of freshwater prawns Macrobrachium borellii and Palaemonetes argentinus (Crustacea, Palaemonidae)
Provedor de dados: 76
Autores: Montagna,Marcela C.
During the two-month rearing period, the effect of four water temperatures (15°C, 20°C, 25°C and 30°C) on survival rate, number of molts, and growth rate (molt increment and intermolt period) of juvenile Macrobrachium borellii Nobili, 1896 and Palaemonetes argentinus Nobili, 1901 prawns was evaluated in laboratory conditions. The two species showed some similarities in their both survival and growth pattern at different temperatures. The survival rate was highest at 20°C and 25°C, decreasing at the lowest temperature. The number of molts increased at higher temperatures, ranging the intermolt period from 22.2 days to 9.9 days, for M. borellii, and from 20.8 to 9.5 days for P. argentinus, corresponding those values to 15°C and 30°C, respectively. No...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Decapods; Molt increment; Intermolt period; Temperature.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212011000200011

Reproductive biology of the swimming crab Achelous spinimanus (Decapoda, Portunoidea): a potential fishing resource
Provedor de dados: 76
Autores: Sousa,Aline N.; Bernardes,Veronica P.; Bernardo,Camila H.; Taddei,Fabiano G.; Teixeira,Gustavo M.; Costa,Rogério C.; Fransozo,Adilson.
ABSTRACT This study describes the reproductive and recruitment patterns of the swimming crab Achelous spinimanus (Latreille, 1819) in the Ubatuba region of the northern coast of São Paulo, Brazil. Crabs were captured monthly from January 1998 to December 1999 in 18 sites located in three bays (Ubatumirim, Ubatuba, and Mar Virado), using a commercial fishing boat. In each sampling area, bottom temperature, salinity, and organic matter content were recorded. A total of 1,911 individuals were captured: 350 adult males, 475 non-ovigerous adult females, 584 adult ovigerous females, and 502 immature individuals. Reproductive females were more abundant in deeper areas; this migration might be a strategy to improve larval dispersion and survival. Ovigerous females...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fishing; Organic matter; Recruitment; Temperature; Ubatuba.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212020000100210

Temperature, urbanization and body color polymorphism in South Brazilian populations of Drosophila kikkawai (Diptera, Drosophilidae)
Provedor de dados: 76
Autores: Costa,Bartira E. Pinheiro da; Rohde,Cláudia; Valente,Vera Lúcia da Silva.
Body color polymorphism of urban populations of cosmopolite fly Drosophila kikkawai Burla, 1954 was investigated in relation to its possible association with environmental temperature. Samples of D. kikkawai were collected in spring, summer, autumn and winter between 1987 to 1988, in zones with different levels of urbanization in the southern Brazilian city of Porto Alegre, Rio Grande do Sul. A clear association was observed between darker flies and both seasons with low temperatures and areas of low urbanization (where temperature is generally lower than in urbanized areas). Results of preliminary laboratory experiments involving six generations of flies grown in chambers at temperatures of 17º and 25ºC confirmed this tendency to a relationship between...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Drosophila; Urban populations; Color polymorphism; Temperature.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212003000400005

Exigências térmicas para o desenvolvimento de Palmistichus elaeisis (Hymenoptera, Eulophidae) em pupas de cinco espécies de lepidópteros
Provedor de dados: 76
Autores: Bittencourt,Maria Aparecida L.; Berti Filho,Evoneo.
The thermal requirements of Palmistichus elaeisis Delvare &amp;amp; LaSalle, 1993 were determined by rearing this pupal parasitoid in the following lepidopteran hosts: Diatraea saccharalis (Fabricius, 1794) (Crambidae), Anticarsia gemmatalis (Hübner, 1818), Heliothis virescens (Fabricius, 1777), Spodoptera frugiperda (J.E. Smith, 1797) (Noctuidae) and Thyrinteina arnobia (Stoll, 1782) (Geometridae). The experiment was set in laboratory conditions (temperatures between 18ºC and 30ºC, RH=70 ± 10% and 14-hour photoperiod). The life cycle (egg-adult) ranged from 40.4 ± 0.63 days (18ºC, H. virescens) to 18.1 ± 0.13 days (28ºC, D. saccharalis). The thermal constant of the egg-adult period ranged from 353.1 (D. saccharalis) to 407.7 degree-days (S. frugiperda)....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lepidoptera; Parasitoids; Biology; Temperature.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212004000300016

Effect of temperature changes on the cercarial-shedding rate of two trematodes
Provedor de dados: 76
Autores: Achiorno,Cecilia L.; Martorelli,Sergio R.
ABSTRACT Since temperature is a key condition in the initiation of cercarial emergence, the objective of the work reported here was to evaluate the effect of that variable on the shedding of two morphologic and taxonomic types of cercariae. Bioassays were accordingly performed with snails naturally infected with either monostome or pleurolophocercous cercariae because those two cercarial types were found to be the most prevalent in the environment under study. The snails were placed in 6-ml circular plastic dishes with soft plastic stoppers containing 3 ml of reconstituted water and then sequentially exposed for 24 h to a 14:10-h light:dark cycle at 20, 25, or 30 °C. The data were analyzed at a significance level of p &lt;0.05 by means of the InfoStat...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Parasites; Cercarial emergence; Freshwater; Temperature; Bioassay.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212016000100220

Contribuição ao conhecimento da temperatura do solo na região de Belém.
Provedor de dados: 14
Autores: BASTOS, T. X.; SÁ, T. D. de A.
bitstream/item/93573/1/Comunicado28.pdf
Tipo: Séries anteriores (INFOTECA-E)
Palavras-chave: Belem; Pará; Brasil.; Temperatura; Solo.; Amazonia; Temperature; Soil.
Ano: 1972
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/376656

Mudanças climáticas em Sete Lagoas-MG, Brasil: tendências de variações de temperatura e precipitação entre 1926 e 2021.
Provedor de dados: 14
Autores: LANDAU, E. C.; GUIMARAES, D. P.; VALADARES, G. M.
O aquecimento global e os efeitos relacionados a esse fenômeno representam uma preocupação para a tomada de decisões na agropecuária e outras atividades dependentes do clima. Este trabalho objetiva identificar possíveis tendências de mudanças climáticas de temperatura e precipitação pluvial ou pluviométrica, considerando período de análise de mais de 90 anos consecutivos, na Estação Meteorológica de Sete Lagoas, Minas Gerais. As análises de tendência de mudança de temperatura e dos padrões de precipitação foram realizadas através do ajuste de regressão linear simples. Foram analisadas possíveis tendências de mudanças nos padrões de temperatura e precipitação nas últimas décadas considerando série histórica de dados registrados na Estação Meteorológica de...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Aquecimento global; Precipitation; Temperatura; Precipitação Pluvial; Clima; Aquecimento; Global warming; Temperature.
Ano: 2021
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1133038

Avaliação do potencial desenvolvimento de Helicoverpa armigera (Hübner, 1808) (Lepidoptera: Noctuidae) em cultivo de soja na região de Barretos - norte do estado de São Paulo.
Provedor de dados: 14
Autores: PESSOA, M. C. P. Y.; MARINHO-PRADO, J. S.; SA, L. A. N. de.
Resumo: O objetivo deste trabalho foi avaliar o potencial desenvolvimento de estágios de Helicoverpa armigera, considerando suas diferentes necessidades térmicas, as características de cultivo de soja e as condições climáticas predominantes no município de Guaíra, localizado na região administrativa de Barretos ao norte do estado de São Paulo. A região norte do estado está exposta à potencial dispersão de H. armigera proveniente de infestações já relatadas em Goiás e tem importância significativa no setor agropecuário paulista. O município foi escolhido por ser o maior produtor estadual de soja e pela sua proximidade aos outros municípios com cultivos hospedeiros preferenciais da praga, tanto na região de Barretos como de Olímpia. Foram considerados dados...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Defesa fitossanitária; Exigências térmicas; São Paulo (estado); Barretos; Praga quarentenária; Praga de planta; Soja; Clima; Temperatura; Lepidoptero; Plant pests; Pest monitoring; Helicoverpa armigera; Climate; Temperature.
Ano: 2014
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1011836

Condições meteorológicas e a fenologia de macieiras da região de Vacaria, RS.
Provedor de dados: 14
Autores: CARDOSO, L. S.; NACHTIGALL, G. R.; BERGAMASCHI, H.; PAULA, V. A. de; BOSCO, L. C.; MARODIN, G. A. B.
bitstream/item/103397/1/Comunicado-Tecnico-145.pdf
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Vacaria; Flutuação de temperatura; Maca; Meteorologia; Frio; Clima; Fenologia; Temperatura; Apples; Meteorology and climatology; Cold zones; Climate; Temperature; Phenology.
Ano: 2013
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/988063

Emergência e vigor de sementes de guaraná submetidas a pré-tratamentos térmicos.
Provedor de dados: 14
Autores: FRAZÃO, D. A. C.; FIGUEIRÊDO, F. J. C.; CARVALHO, J. E. U. de; POPINIGIS, F.; OLIVEIRA, R. P. de.
bitstream/item/31894/1/CPATU-BP29.pdf
Tipo: Séries anteriores (INFOTECA-E)
Palavras-chave: Efeito; Seed; Emergency; Effect; Methyd bromide.; Brometo de Metila; Emergência; Germinação; Guaraná; Paullinia Cupana; Semente; Temperatura.; Germination; Temperature; Vigor.
Ano: 1981
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/380317

Classificação da incidência de área gessada do arroz de terras altas e o impacto das variáveis climáticas.
Provedor de dados: 14
Autores: RODRIGUES, B.; BASSINELLO, P. Z.; BORBA, T. C. de O.; MATTA, D. H. da; STONE, L. F.; HEINEMANN, A. B.
O gessamento no grão de arroz torna-o opaco, mais quebradiço e com maior probabilidade de empapamento, portanto diminui a qualidade, além do valor de mercado. É um problema altamente influenciado por adversidades meteorológicas durante a safra. Até então, não há classificação oficial definida para a área gessada. Este estudo objetivou estabelecer uma classificação para a área gessada e determinar as variáveis climáticas que mais impactam esse defeito. Dados de quatro experimentos realizados em Porangatu, GO, e Vilhena, RO, safras 2018/2019 e 2019/2020, com 11 genótipos contrastantes, foram utilizados. A análise estatística foi dividida em três passos: 1) análise dos valores preditos da área gessada de 11 genótipos; 2) classificação dos valores preditos; e...
Tipo: Folhetos
Palavras-chave: Gessamento; Chalkiness; Climate variables; Selo ODS 2; Agenda 2030; Objetivo de desenvolvimento sustentável; Arroz; Oryza Sativa; Temperatura; Qualidade; Grão; Rice; Temperature.
Ano: 2022
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1149253

Efeito do desmatamento na temperatura do solo em região equatorial úmida.
Provedor de dados: 14
Autores: DINIZ, T. D. de A. S.; BASTOS, T. X.
bitstream/item/28817/1/CPATU-BP7.pdf
Tipo: Séries anteriores (INFOTECA-E)
Palavras-chave: Efeito; Belem; Pará; Brasil; Forest; Effect.; Desmatamento; Floresta; Temperatura; Solo.; Deforestation; Temperature; Soil.
Ano: 1980
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/376817

Sources de variation de la forme des otolithes: Implications pour la discrimination des stocks de poissons
Provedor de dados: 5
Autores: Mahe, Kelig.
The assessment and management of fish populations is based on the use of management units called fish stocks. The shape of otoliths, calcified structures of the fish's inner ear, can be used to discriminate these stocks. First, this thesis focuses on the study of the spatio-temporal variability of the otolith’s shape for three fish species with different ecological characteristics (size, swimming speed, behaviour in the water column, etc.) and biogeographical environments. The results showed that there is a decreasing structural gradient across stock sizes from large pelagic species to more localised demersal species. This is linked to the fact that some demersal species such as the bogue (Boops boops) are constrained by the presence of geographical...
Tipo: Text
Palavras-chave: Otolithe; Forme; Stock halieutique; Descripteurs de Fourier; Température; Acides gras; Asymétrie directionnelle; Degrés-jours de croissance; Otolith; Shape; Fish stock; Fourier descriptors; Temperature; Fatty acids; Directional asymmetry; Growing degree days.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00598/70972/69201.pdf

MEDAR/MEDATLAS 2002: A Mediterranean and Black Sea database for operational oceanography Elsevier Oceanography Series
Provedor de dados: 5
Autores: Fichaut, Michele; Garcia, Maria-jesus; Giorgetti, Alessandra; Iona, Athanasia; Kuznetsov, Alexander; Rixen, Michel; Medar Group,.
A comprehensive database of temperature, salinity and bio-chemical parameters in the Mediterranean and Black Sea has been constructed through comprehensive co-operation between the bordering countries. Statistical climatologies have been computed with all assembled and quality controlled data. The database, designed to initiate and validate prediction models, also represents a system to quality-check new incoming data produced by ocean observing systems.
Tipo: Text
Palavras-chave: Database; Temperature; Salinity; Nutrients; Climatology; Quality control.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/00351/46177/45876.pdf

Influence of food density and temperature on ingestion, growth and settlement of Pacific oyster larvae, Crassostrea gigas
Provedor de dados: 5
Autores: Rico Villa, Benjamin; Pouvreau, Stephane; Robert, Rene.
Ingestion, growth and metamorphosis of Pacific oyster, Crassostrea gigas, larvae were studied under controlled conditions of food density and temperature using a combination of a flow-through rearing system and a hydrobiological monitoring device. In a first experiment larvae were exposed to three different phytoplankton densities (12, 20 and 40 cells &amp;#956;l-1) while in a second trial larvae were reared at five different temperatures (17, 22, 25, 27 and 32°C). Both food concentration and temperature significantly affected the larval physiology throughout the entire development from D-veliger to young spat. Larvae survived over a wide range of both environmental parameters with high survival at the end of experiments. The feeding functional response...
Tipo: Text
Palavras-chave: Temperature; Food; Growth; Ecophysiology; Bivalve larvae; Crassostrea gigas.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2008/publication-4747.pdf

Detection of ostreid herpesvirus 1 (OsHV-1) DNA in seawater by PCR: influence of water parameters in bioassays
Provedor de dados: 5
Autores: Vigneron, Vassilia; Solliec, Gaelle; Montanie, Hélène; Renault, Tristan.
Since 1991, herpesvirus infections have been reported among larvae and juveniles of various bivalves. Most of the studies focused on detection of viral infections of economically important species. However, the persistence of bivalve herpesviruses; in the marine environment is poorly documented. The present study concerns the role of seawater parameters in Ostreid Herpesvirus I (OsHV-1) detection by polymerase chain reaction (PCR). Viral DNA extracted from purified particles or virions present in infected oyster larvae were detected by PCR after storage in different media at different temperatures. The lowest detection threshold was found using distilled water or Tris EDTA buffer. In seawater, the threshold was higher. The use of sterile media permitted...
Tipo: Text
Palavras-chave: Temperature; PCR; Detection; Seawater; Viral DNA; Oyster herpesvirus 1.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/publication-2909.pdf

S'acclimater à des salinités et températures changeantes : un focus sur la branchie chez le loup européen Dicentrarchus labrax
Provedor de dados: 5
Autores: Masroor, Waliullah.
The European sea bass Dicentrarchus labrax undertakes seasonal migrations to estuaries and lagoons that are characterized by fluctuations in environmental conditions. It is unclear to what extent salinity acclimation mechanisms are affected at temperatures higher than in the sea, as usually encountered in transitional waters in spring and summer. In this study, juvenile sea bass were pre-acclimated to seawater (SW) at 18 °C (temperate) or 24 °C (warm) for two weeks and then transferred to either fresh water (FW) or SW at the considered temperatures. We have shown that sea bass are able to efficiently maintain blood osmolality at 24 °C at both salinities. However, temperature increase induced significant changes regarding several physiological traits...
Tipo: Text
Palavras-chave: Salinité; Poisson téléostéen; Écophysiologie; Branchies; Transport ionique; Salinity; Ecophysiology; Teleost fish; Temperature; Gills; Ion transport.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00500/61175/64661.pdf

Seasonal and intraseasonal biogeochemical variability in the thermocline ridge of the southern tropical Indian Ocean
Provedor de dados: 5
Autores: Resplandy, L.; Vialard, Jerome; Levy, M.; Aumont, Olivier; Dandonneau, Y.
The Sea-viewing Wide Field-of-view Sensor (SeaWiFS) time series shows high variability of surface chlorophyll at seasonal and intraseasonal time scales in the oligotrophic southern tropical Indian Ocean thermocline ridge called the Seychelles-Chagos thermocline ridge (SCTR). The SCTR is characterized by an open ocean upwelling due to local Ekman pumping, which annually maintains the mixed layer (ML) shallow and is responsive to atmospheric forcing and in particular to the Madden-Julian Oscillation (MJO) at an intraseasonal time scale. Here we present an overview of SCTR biogeochemistry and investigate the physical processes driving the response observed at seasonal and intraseasonal time scales. Using satellite observations and biophysical ocean...
Tipo: Text
Palavras-chave: Madden julian oscillation; Arabian sea; Rossby waves; Interannual variability; Circulation model; Monsoon; Temperature; Perturbations; Nutrients; Dynamics.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/00185/29630/27994.pdf

Seasonal Variation of Lipids and Fatty Acids of the Microalgae Nannochloropsis oculata Grown in Outdoor Large-Scale Photobioreactors
Provedor de dados: 5
Autores: Olofsson, Martin; Lamela, Teresa; Nilsson, Emmelie; Berge, Jean-pascal; Del Pino, Victoria; Uronen, Pauliina; Legrand, Catherine.
While focus in oil-producing microalgae is normally on nutrient deficiency, we addressed the seasonal variations of lipid content and composition in large-scale cultivation. Lipid content, fatty acid profiles and mono- di- and triglycerides (MAGs, DAGs, and TAGs) were analyzed during May 2007-May 2009 in Nannochloropsis oculata grown outdoors in closed vertical flat panels photobioreactors. Total lipids (TL) ranged from 11% of dry weight (DW) in winter to 30% of DW in autumn. 50% of the variation in TL could be explained by light and temperature. As the highest lipid content was recorded during autumn indicating an optimal, non-linear, response to light and temperature we hypothesize that enhanced thylakoid stacking under reduced light conditions resulted...
Tipo: Text
Palavras-chave: Biodiesel; Microalgae; Seasonal variation; Nannochloropsis oculata; Large-scale; Lipids; Fatty acids; Light; Temperature.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00085/19582/17206.pdf

Anchovy population expansion in the North Sea
Provedor de dados: 5
Autores: Petitgas, Pierre; Alheit, Juergen; Peck, Myron A.; Raab, Kristina; Irigoien, Xabier; Huret, Martin; Van Der Kooij, Jeroen; Pohlmann, Thomas; Wagner, Carola; Zarraonaindia, Iratxe; Dickey-collas, Mark.
The abundance and spatial occupation of European anchovy Engraulis encrasicolus have increased in the North Sea since the mid-1990s. We use a cross-disciplinary approach combining genetics, transport modelling, survey time series analyses and physical oceanographic modelling to investigate 3 hypotheses on the reasons for this change. Evidence from connectivity studies suggests that the population of North Sea anchovy is separate from that in the Bay of Biscay. The recruitment pulses observed in survey data fit a life cycle which includes spawning in early summer and larval development in late summer. This also supports the concept of population expansion originating from local remnant population(s). In terms of growth physiology, suitable thermal windows...
Tipo: Text
Palavras-chave: Climate variability; Small pelagic fish; Regime shift; Temperature; Anchovy; North Sea.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00060/17140/14638.pdf

Etude experimentale preliminaire sur les echanges gazeux chez Pinna nobilis
Provedor de dados: 5
Autores: Vicente, N; Riva, A; Butler, A.
Breathing exchanges of Pinna nobilis L. are studied in situ and in the laboratory with two methods. First method consist in introducing samples of Pinna under a 40l plexiglass bell equipped with haps. The bell is positionned by diving. The consumption of oxygen is observed with water samples and the oxygen concentration is measured with an electronic oxymeter. Experiments which are carried out during nycthemeral cycles are reproduced in the laboratory with the same type of bell. A second method carry into effect an apparatus more sophisticated, who put into circulation a current of water in an airtight thermostated cellule, where a specimen of young Pinna is introduced. This sample is gradually adaptated to the conditions of the medium. Breathing...
Tipo: Text
Palavras-chave: Pinna nobilis; Bivalvia; Temperature; Metabolism; Oxygen consumption; Experimental research; Breathing mixtures; Marine molluscs.
Ano: 1991
URL: http://archimer.ifremer.fr/doc/1991/acte-1761.pdf

MIMOC: A global monthly isopycnal upper-ocean climatology with mixed layers
Provedor de dados: 5
Autores: Schmidtko, Sunke; Johnson, Gregory C.; Lyman, John M.
A monthly, isopycnal/mixed-layer ocean climatology (MIMOC), global from 0 to 1950dbar, is compared with other monthly ocean climatologies. All available quality-controlled profiles of temperature (T) and salinity (S) versus pressure (P) collected by conductivity-temperature-depth (CTD) instruments from the Argo Program, Ice-Tethered Profilers, and archived in the World Ocean Database are used. MIMOC provides maps of mixed layer properties (conservative temperature, , absolute salinity, SA, and maximum P) as well as maps of interior ocean properties (, SA, and P) to 1950dbar on isopycnal surfaces. A third product merges the two onto a pressure grid spanning the upper 1950dbar, adding more familiar potential temperature () and practical salinity (S) maps....
Tipo: Text
Palavras-chave: Climatology; Global; Temperature; Salinity; Mapping; Objective mapping.
Ano: 2013
URL: https://archimer.ifremer.fr/doc/00383/49447/49930.pdf

A flow-through rearing system for ecophysiological studies of Pacific oyster Crassostrea gigas larvae
Provedor de dados: 5
Autores: Rico Villa, Benjamin; Woerther, Patrice; Mingant, Christian; Le Piver, David; Pouvreau, Stephane; Hamon, Michel; Robert, Rene.
While literature is relatively abundant on adult shellfish, ecophysiological studies at the larval stage are scarce because of both technical difficulties and inadequate methodology. A tool dedicated to provide basic information for larval ecophysiology was accordingly developed. Two steps were followed: first a flow-through method of Crassostrea gigas larval culture was perfected during a set of experiments in which rearing systems and larval density were assessed. Then a continuous hydrobiological data recorder was adapted with modifications to comply with our experimental aim. SILO (Système d'Instrumentation des Larves en flux Ouvert) allowed the successive acquisition of hydrobiological parameters in ten 150 l larval tanks in which larvae were reared...
Tipo: Text
Palavras-chave: Temperature; Ecophysiology; Bivalve larvae; Crassostrea gigas; Flow through.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-4167.pdf

Southwest Pacific Ocean response to a warming world: Using Mg/Ca, Zn/Ca, and Mn/Ca in foraminifera to track surface ocean water masses during the last deglaciation
Provedor de dados: 5
Autores: Marr, Julene P.; Carter, Lionel; Bostock, Helen C.; Bolton, Annette; Smith, Euan.
In situ measurements of Mg/Ca, Zn/Ca, Mn/Ca, and Ba/Ca in Globigerinoides bulloides and Globigerina ruber from southwest Pacific core top sites and plankton tow are reported and their potential as paleoproxies is explored. The modern samples cover 20 degrees of latitude from 34 degrees S to 54 degrees S, 7-19 degrees C water temperature, and variable influence of subantarctic (SAW) and subtropical (STW) surface waters. Trace element signatures recorded in core top and plankton tow planktic foraminifera are examined in the context of the chemistry and nutrient profiles of their modern water masses. Our observations suggest that Zn/Ca and Mn/Ca may have the potential to trace SAW and STW. Intraspecies and interspecies offsets identified by in situ...
Tipo: Text
Palavras-chave: Mg; Ca; Mn; Ca; Ba; Ca; Zn; Ca; Southwest Pacific Ocean; Globigerina bulloides; Globigerinoides ruber; Surface ocean; Stratification; Temperature; Nutrient.
Ano: 2013
URL: https://archimer.ifremer.fr/doc/00264/37528/35765.pdf

Impact of essential fatty acid deficiency and temperature on tissues' fatty acid composition of European sea bass (Dicentrarchus labrax)
Provedor de dados: 5
Autores: Skalli, Ali; Robin, Jean; Le Bayon, Nicolas; Le Delliou, Herve; Person, Jeannine.
The effects of essential fatty acid deficiency and temperature on the fatty acid profiles of polar lipids (PL) and neutral lipids (NL) from various tissues (muscle, liver, gills, eyes and brain) of European sea bass juveniles were compared in a two factorial design. Fish (60 g) were held for 84 days at 22 or 29 C (upper limit for growth) and fed either at a lower or a higher level than n-3 HUFA minimal requirement for growth (0.4% and 2.2% n-3 HUFA dry matter for diets LD and HD, respectively). Essential fatty acid deficiency had a major influence on fatty acids in NL fraction of all tissues, a more moderate influence on PL of muscle, liver and gills, while a low and very low diet influence was observed on eyes and brain PL fatty acid content,...
Tipo: Text
Palavras-chave: Tissue fatty acid composition; Temperature; N 3 HUFA; European sea bass.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-1688.pdf

Does dietary n-3 highly unsaturated fatty acids level influence the European sea bass (Dicentrachus labrax) capacity to adapt to a high temperature?
Provedor de dados: 5
Autores: Person, Jeannine; Skalli, Ali; Dulau, Barbara; Le Bayon, Nicolas; Le Delliou, Herve; Robin, Jean.
Triplicate groups of European sea bass juveniles (60 g) were fed for 84 days two experimental diets containing either vegetable or marine oil (0.4 and 2.2% n-3 highly unsaturated fatty acid [n-3 HUFA] dry matter in LD and HD, respectively) and held at 22 or 29 degreesC (LD-22, LD-29, HD-22 and HD-29 groups). Significant differences in mass gain between the two diets and temperatures were, observed from day 28 onwards, and on day 84, weight was 18% higher in the HD-29 group than in the LD-22 group (the highest and lowest values. respectively). Over the 84-day period-SGR was significantly affected both by temperatures and diets (P=6x10(-4) and 2x10(-4) respectively), averaging 1.01 and 1.07 in the HD-22 and HD-29 groups compared to 0.92 and 1.0 in the LD-22...
Tipo: Text
Palavras-chave: Oxygen consumption; Fatty acid composition; Growth; Temperature; N 3 HUFA; European sea bass.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/publication-502.pdf

Determination of gender in the pearl oyster pinctada margaritifera
Provedor de dados: 5
Autores: Chavez-villalba, Jorge; Soyez, Claude; Huvet, Arnaud; Gueguen, Yannick; Lo, Cedrik; Le Moullac, Gilles.
The pearl industry in French Polynesia is based on exploitation of natural stocks of the black-lip pearl oyster (Pinctada margaritifera); it generates an annual turnover of 90 million euros. Improvements in pearl quality need genetic studies to improve the populations. This pearl oyster is a protandric species, where the sex-ratio normally is biased towards males. There is an increasing interest in gender control to find the mechanisms to augment female proportions for management purposes. This review summarizes information on exogenous and endogenous factors regulating gender in this and other bivalves and concludes that P. margaritifera is a protandric hermaphrodite, developing as a male during the first two years and without evidence of an effect from...
Tipo: Text
Palavras-chave: Pearl oyster; Pinctada; Hermaphrodite; Temperature; Food; Stress; Sex genes; Sex steroids.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00040/15100/12543.pdf

Seasonal and longer term trends in sea temperature along the French North Sea coast, 1975 to 2002
Provedor de dados: 5
Autores: Woehrlings, D; Lefebvre, Alain; Lehoerff, Genevieve; Delesmont, R.
Regular sea temperature measurements have been made since 1975 at Gravelines (French coast of the Southern Bight of the North Sea) within the framework of a research programme aimed at monitoring the influence of the thermal discharge of a nuclear power plant. The sampling has yielded a 28-year time-series. Pluriannual natural fluctuations of temperature show cyclic patterns and long-term trends in good accordance with global climatic changes as revealed by the NAO (North Atlantic Oscillation) annual index.
Tipo: Text
Palavras-chave: Fluctuation; Temperature; Long term; Seasonal.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-616.pdf

Domestication and Temperature Modulate Gene Expression Signatures and Growth in the Australasian Snapper     Chrysophrys auratus
Provedor de dados: 5
Autores: Wellenreuther, Maren; Le Luyer, Jeremy; Cook, Denham; Ritchie, Peter A.; Bernatchez, Louis.
Identifying genes and pathways involved in domestication is critical to understand how species change in response to human-induced selection pressures, such as increased temperatures. Given the profound influence of temperature on fish metabolism and organismal performance, a comparison of how temperature affects wild and domestic strains of snapper is an important question to address. We experimentally manipulated temperature conditions for F1-hatchery and wild Australasian snapper (Chrysophrys auratus) for 18 days to mimic seasonal extremes and measured differences in growth, white muscle RNA transcription and hematological parameters. Over 2.2 Gb paired-end reads were assembled de novo for a total set of 33,017 transcripts (N50 = 2,804). We found...
Tipo: Text
Palavras-chave: Domestication; Temperature; Transcriptomics; Growth; Sparidae.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00476/58788/61321.pdf

Effects of oil exposure and dispersant use upon environmental adaptation performance and fitness in the European sea bass, Dicentrarchus labrax
Provedor de dados: 5
Autores: Claireaux, Guy; Theron, Michael; Prineau, Michel; Dussauze, Matthieu; Merlin, Francois Xavier; Le Floch, Stephane.
The worldwide increasing recourse to chemical dispersants to deal with oil spills in marine coastal ecosystems is a controversial issue. Yet, there exists no adequate methodology that can provide reliable predictions of how oil and dispersant-treated oil can affect relevant organism or population-level performance. The primary objective of the present study was to examine and compare the effects of exposure to untreated oil (weathered Arabian light crude oil), chemically dispersed oil (Finasol, TOTAL-Fluides) or dispersant alone, upon the ability of fish for environmental adaptation. To reach that goal, we implemented high-throughput, non-lethal challenge tests to estimate individual hypoxia and heat tolerance as surrogate measures of their capacity to...
Tipo: Text
Palavras-chave: Oil-spill; Dispersant; Fish; Temperature; Hypoxia; Survival; Growth; Environmental adaptation ability; Darwinian fitness.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00137/24831/23045.pdf

Cycle annuel de mesures physiques dans le milieu récepteur marin. Mouillage T.O. dans la grande rade de Toulon. Programme rejets urbains. Volet Méditerranée
Provedor de dados: 5
Autores: Thouvenin, Benedicte; Romana, L. A.; Loarer, Ronan; Joly, R.
This report is a compilation of current, wind, temperature and salinity measurements carried out during one and a half years, in the bay of Toulon, near the Sainte Marguerite sea outfall.
Tipo: Text
Palavras-chave: Mesures; Courants; Température; Salinité; Météorologie; Toulon; Méditerranée; Measurements; Currents; Temperature; Salinity; Meteorology; Toulon; Mediterranean sea.
Ano: 1988
URL: http://archimer.ifremer.fr/doc/00432/54351/58914.pdf

Influence de la température sur la physiologie de l'huître Crassostrea
Provedor de dados: 5
Autores: Le Gall, Jean-luc; Raillard, Olivier.
After four weeks' stabulation, at temperatures ranging from 30°C to 10°C for a given level of food (2.10 cells of Chaetoceros calcitrans.1(-1) ), a study of the growth and evolution of the biochemical contents of the oyster Crassostrea gigas showed a negative effect of high (30°C) and low (10°C) temperatures on growth; levels of total glucid and glycogen were inversely proportional to temperature and related to gametogenesis. At the same time measurements of the filtration rate, respiration and food consumption done at different levels of food (10(6) to 8.10(7) cells.1(-1) showed a better adaptation of the oysters to 20°C after one month.
Tipo: Text
Palavras-chave: Crassostrea gigas; Filtration rate; Respiration; Food; Temperature; Crassostrea gigas; Filtration; Respiration; Nourriture; Température.
Ano: 1988
URL: http://archimer.ifremer.fr/doc/1988/publication-2871.pdf

Effet de traitements thermiques sur la résistance du naissain d’huître creuse au phénomène de mortalité massive - THERMARES
Provedor de dados: 5
Autores: Pernet, Fabrice; Petton, Bruno; Tamayo, David.
L’objectif de cette étude vise à déterminer l’effet de basses températures (10°C et 13°C) pendant des durées variables (0 et 80 jours) sur la survie du naissain d’huîtres creuses préalablement infecté suite à une exposition en rade de Brest pendant 5 ou 8 jours.  Le naissain d’huître creuse préalablement infecté par OsHV-1 µvar par exposition en milieu naturel pendant 5 d ou 8 d, puis transféré à basse température (10°C ou 13°C) pendant 5 à 80 d, présente des mortalités plus faibles et plus tardives que les animaux témoins en laboratoire. La réduction des mortalités observée dans le naissain exposé à basse température coïncide avec une diminution progressive des concentrations d’ADN appartenant à OsHV-1 dans les tissus, au point de devenir non-détecté ou...
Tipo: Text
Palavras-chave: Huître creuse; Naissain; Mortalité massive; OsHV-1 μvar; Température; Pacific oyster; Mass mortality; OsHV-1 μvar; Spat; Temperature.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00210/32135/30592.pdf

Environmental controlling factors of copepod communities in the Gulf of Tunis (south western Mediterranean Sea)
Provedor de dados: 5
Autores: Ben Lamine, Yosra; Pringault, Olivier; Aissi, Mehdi; Ensibi, Cherif; Mahmoudi, Ezzeddine; Kefi, Ons Daly Yahia; Yahia, Mohamed Nejib Daly.
The copepod community structure and the distribution of the main groups of zooplankton were studied along an inshore-offshore gradient in the Gulf of Tunis during the rainy and dry seasons of 2007-2008. Hydrological parameters were also measured to assess the potential role of abiotic and biotic factors in the distribution of copepod species. The copepod community in the Gulf of Tunis comprises 86 species dominated by Paracalanus parvus, Clausocalanus lividus, Centropages kroyeri and Acartia clausi. Time had a greater influence than space (horizontal and vertical gradients) in shaping the copepod community structure with a significant influence of the seasons; winter (cold and rainy) resulted in hydrological conditions that were strongly different from...
Tipo: Text
Palavras-chave: Copepod diversity; Multivariate analysis; Temperature; Salinity; Top-down control; Competition.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00275/38670/73416.pdf

Expédition OceanoScientific 2016-2017 : Etudes des mesures de température et de salinité de surface
Provedor de dados: 5
Autores: Reynaud, Thierry; Reverdin, Gilles; Metzl, Nicolas; Griboval, Yvan.
The OceanoScientific Programm was initiated in 2006 and yielded the creation of a specific equipment : the OSC-System. The OSC-System measures physical parameters at the air-sea interface including Sea Surface temperature and Salinity. An OSC-System was installed on board of the OceanoScientific Explorer Boogaloo sailing ship. A cruise around the world was initiated the 17/11/2016 and ended 02/06/2017 including 60 days south of 40°S. Sea Surface temperature and salinity collected along this cruise are discussed in this technical report.
Tipo: Text
Palavras-chave: Mesures; Température; Salinité; Surface; Oceanoscientific; Boogaloo; Antarctique; Temperature; Salinity; SST; SSS; Measurements; Antarctic.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00472/58356/60914.pdf

Deep sequencing of the mantle transcriptome of the great scallop Pecten maximus
Provedor de dados: 5
Autores: Artigaud, Sebastien; Thorne, Michael A. S.; Richard, Joelle; Lavaud, Romain; Jean, Fred; Flye-sainte-marie, Jonathan; Peck, Lloyd S.; Pichereau, Vianney; Clark, Melody S.
RNA-Seq transcriptome data were generated from mantle tissue of the great scallop, Pecten maximus. The consensus data were produced from a time course series of animals subjected to a 56-day thermal challenge at 3 different temperatures. A total of 26,064 contigs were assembled de novo, providing a useful resource for both the aquaculture community and researchers with an interest in mollusc shell production.
Tipo: Text
Palavras-chave: Pecten maximus; RNAseq; Temperature.
Ano: 2014
URL: https://archimer.ifremer.fr/doc/00202/31362/82662.pdf

The use of high rate algal ponds for the treatment of marine effluent from a recirculating fish rearing system
Provedor de dados: 5
Autores: Pagand, Pascal; Blancheton, Jean-paul; Lemoalle, J; Casellas, C.
A high rate algal pond (HRAP) system was used to treat effluent from a recirculating sea water aquaculture system in southern France. Dicentrarchus labrax L. were farmed at a high density, with effluents containing an average of 10 mg L-1 dissolved inorganic nitrogen (DIN) and 1.3 mg L-1 reactive phosphorus (RP). On a yearly basis, the algal pond removed 59% of the dissolved nitrogen and 56% of the phosphorus input, which was converted into 3.3 kg DW m(-2) algae. Green macroalgae were dominant throughout the year and the algal biomass mirrored the seasonal changes in daily irradiance and temperature. This first year study supports the possibility of treating marine aquaculture wastes using HPAPs, although conditions will have to be found to mitigate the...
Tipo: Text
Palavras-chave: Nitrogen; Biofilters; Irradiance; Temperature; Photosynthesis; Growth; Culture; Chlorophyta; Nutrient Removal.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/2000/publication-515.pdf

High temperature induces transcriptomic changes in   Crassostrea gigas   that hinder progress of ostreid herpesvirus (OsHV-1) and promote survival
Provedor de dados: 5
Autores: Delisle, Lizenn; Pauletto, Marianna; Vidal-dupiol, Jeremie; Petton, Bruno; Bargelloni, Luca; Montagnani, Caroline; Pernet, Fabrice; Corporeau, Charlotte; Fleury, Elodie.
Of all environmental factors, seawater temperature plays a decisive role in triggering marine diseases. Like fever in vertebrates, high seawater temperature could modulate the host response to pathogens in ectothermic animals. In France, massive mortality of Pacific oysters, Crassostrea gigas, caused by the ostreid herpesvirus 1 (OsHV-1) is markedly reduced when temperatures exceed 24°C in the field. In the present study we assess how high temperature influences the host response to the pathogen by comparing transcriptomes (RNA sequencing) during the course of experimental infection at 21°C (reference) and 29°C. We show that high temperature induced host physiological processes that are unfavorable to the viral infection. Temperature influenced the...
Tipo: Text
Palavras-chave: Anti-viral molecular pathway; Host-pathogen interaction; Marine disease; OsHV-1; Resistance; Temperature.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00656/76806/77974.pdf

Summer seed mortality of the Pacific oyster, Crassostrea gigas Thunberg grown in Tomales Bay, California, USA : the influence of oyster stock, planting time, pathogens, and environmental stressors
Provedor de dados: 5
Autores: Burge, Colleen; Judah, Linda; Conquest, Loveday; Griffin, Frederick; Cheney, Daniel; Suhrbier, Andrew; Vadopalas, Brent; Olin, Paul G.; Renault, Tristan; Friedman, Carolyn S.
Summer seed mortality (SSM) has occurred yearly in Tomales Bay, California since 1993. SSM has resulted in up to 90% cumulative losses, and has been associated with extreme temperature, phytoplankton blooms, and an oyster herpesvirus. In this study, three stocks of Pacific oysters were planted at three sites in California (Inner Tomales Bay, Outer Tomales Bay, and Bodega Harbor) in October of 2000 (Fall) and April of 2001 (Spring) and monitored for mortality, growth, and health status. In April of 2001, a similar study was conducted in Totten Inlet, WA state using cohorts of oysters planted in California; animals were monitored for mortality and growth. Temperature data were collected at all sites; phytoplankton abundance data were collected  at the...
Tipo: Text
Palavras-chave: California; Tomales Bay; Oyster herpesvirus; Temperature; Mortality; Crassostrea gigas; Pacific oysters.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2976.pdf

Effects of temperature, stocking density and farming conditions on fin damage in European sea bass (Dicentrarchus labrax)
Provedor de dados: 5
Autores: Person, Jeannine; Le Bayon, Nicolas.
This paper presents a non invasive, rapid and reliable way to quantitatively assess fin erosion in sea bass (Dicentrarchus labrax). The method is based on a visual assessment of fin profile and area loss of all fins except the anterior dorsal, on a scale from 0 to 4 in comparison with a perfect fin. The effects of stocking density (SD) and temperature on fin damage were investigated under experimental conditions (100-250 g fish). Over a 4-month period, mean erosion index (mean erosion level of all fins) was 10 times higher at 120 than at 20 kg m(-3), where most fins were undamaged. Damage was also dependent on time and oxygen concentration (35% lower at 53% O-2 saturation than at 105%). Fin condition was also affected by temperature: mean erosion index was...
Tipo: Text
Palavras-chave: Rearing systems; Stocking density; Temperature; Welfare; Fin damage; Sea bass.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6873.pdf

Première approche de la dynamique d'une population de Temora Longicornis O.F. Müler (Copepoda, Calanoida) dans les bassins à flot du port de Dunkerque (France)
Provedor de dados: 5
Autores: Brylinski, Jm.
The wet docks of Dunkirk are 3 to 4 degrees Celcius warmer than the seaboard waters of the North Sea. Such warmth is due to thermic industrial was­te mainly from the E.D.F. power-station. A thermic and saline stratification can be observed that favours heterogeneousness among the populations of Temora lon- gicomis. The samples of copepods taken from the North Sea are significantly bigger than those found in the port of Dunkirk. Differences in size vary in the course of the year. The action of high temperatures upon reproduction is being debated j so is the existence of an autochtonous population in the docks in sum­mer.
Tipo: Text
Palavras-chave: Temora longicornis; Milieu portuaire; Température; Biométrie; Dynamique; Temora longicornis; Harbour; Temperature; Biometry; Dynamic.
Ano: 1979
URL: http://archimer.ifremer.fr/doc/00305/41656/40865.pdf

Comparaison de la respiration chez Ruditapes decussatus (L.) et R. philippinarum (Adams &amp; Reeve) en fonction de la température
Provedor de dados: 5
Autores: Bodoy, Alain; Riva, Alain; Maitre-allain, Thierry.
Measurements of oxygen consumption in the two species Ruditapes  decussatus and Ruditapes phi/ippinarum were perfonned using hatchery-reared juveniles, grown under controlled conditions. The temperature range varied from 10 to 30°C. The linear relations between the logarithms of the dry weight and of the oxygen consumption were calculated for each species. Rates were compared in terms of standardized clam tissue weight calculated from the regression of respiration on tissue weight. Such a technique allows to make comparisons between the species by avoiding any interference from the variations in individual weight. Within this range of temperature, oxygen consumption of R. philippinarum and of R. decussatus exhibit the same variations, with a maximum at...
Tipo: Text
Palavras-chave: Temperature; Oxygen consumption; Ruditapes philippinarum; Ruditapes decussatus; Température; Consommation oxygène; Ruditapes philippinarum; Ruditapes decussatus.
Ano: 1986
URL: http://archimer.ifremer.fr/doc/1986/publication-2963.pdf

Air-sea CO2 flux variability in frontal regions of the Southern Ocean from CARbon Interface OCean Atmosphere drifters
Provedor de dados: 5
Autores: Boutin, Jacqueline; Merlivat, L.; Henocq, C.; Martin, Nicolas; Sallee, Jean-baptiste.
Nine CARbon Interface OCean Atmosphere (CARIOCA) drifters were deployed in the Southern Ocean (south of the subtropical front, STF) between 2001 and 2006. They recorded 65 months of measurements in all seasons between 57 degrees S and 40 degrees S. Hydrological fronts detected by altimetry indicate that one buoy explored the polar zone (PZ) of the Atlantic Ocean and the western Indian Ocean; the remaining buoys explored the northern and southern parts of the subantarctic zone (SAZ) from the mid-Indian Ocean (73 degrees E) to the eastern Pacific Ocean (112 degrees W). The air-sea CO2 fluxes along the buoy trajectories are primarily driven by the spatial variability of the fugacity of CO2 in seawater, fCO(2): in the SAZ, they vary between -1.1 and -4.2 mol...
Tipo: Text
Palavras-chave: Antarctic circumpolar current; Northwestern mediterranean sea; Atlantic sector; Surface water; Gas exchange; Polar front; Temperature; Seawater; Transport.
Ano: 2008
URL: https://archimer.ifremer.fr/doc/00204/31483/29880.pdf

Toxicite des Elements Metalliques Dissous pour les Larves d'Organismes Marins: Donnees Bibliographiques.
Provedor de dados: 5
Autores: Deslous-paoli, Jean-marc.
A bibliographic review has been made on the toxicity of ten metals for some marine larvae of commercial interest. We have classified, according to toxicity, organic salts of tin, mercury, silver, copper, zinc, nickel, lead, cadmium, chromium and manganese. Some synergistic effects of metals, temperature and salinity are described as well as the action of silt suspended in water.
Tipo: Text
Palavras-chave: Mollusca; Crustacea; Pollution effects; Bibliographies; Salinity; Temperature; Synergism; Heavy metals; Toxicity.
Ano: 1981
URL: http://archimer.ifremer.fr/doc/1981/publication-1885.pdf

Improved Statistical Method for Quality Control of Hydrographic Observations
Provedor de dados: 5
Autores: Gourrion, Jerome; Szekely, Tanguy; Killick, Rachel; Owens, Breck; Reverdin, Gilles; Chapron, Bertrand.
Realistic ocean state prediction and its validation rely on the availability of high quality in situ observations. To detect data errors, adequate quality check procedures must be designed. This paper presents procedures that take advantage of the ever-growing observation databases that provide climatological knowledge of the ocean variability in the neighborhood of an observation location. Local validity intervals are used to estimate binarily whether the observed values are considered as good or erroneous. Whereas a classical approach estimates validity bounds from first- and second-order moments of the climatological parameter distribution, that is, mean and variance, this work proposes to infer them directly from minimum and maximum observed values....
Tipo: Text
Palavras-chave: Ocean; Climatology; Salinity; Temperature; Data quality control; Oceanic variability.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00628/74031/73359.pdf

Influence of Environmental Factors on the Paralytic Shellfish Toxin Content and Profile of Alexandrium catenella (Dinophyceae) Isolated from the Mediterranean Sea
Provedor de dados: 5
Autores: Laabir, Mohamed; Collos, Yves; Masseret, Estelle; Grzebyk, Daniel; Abadie, Eric; Savar, Veronique; Sibat, Manoella; Amzil, Zouher.
Laboratory experiments were designed to study the toxin content and profile of the Alexandrium catenella strain ACT03 (isolated from Thau Lagoon, French Mediterranean) in response to abiotic environmental factors under nutrient-replete conditions. This dinoflagellate can produce various paralytic shellfish toxins with concentrations ranging from 2.9 to 50.3 fmol/cell. The toxin profile was characterized by carbamate toxins (GTX3, GTX4 and GTX5) and N-sulfocarbamoyl toxins (C1, C2, C3 and C4). C2 dominated at 12-18 degrees C, but only for salinities ranging from 10 to 25 psu, whereas GTX5 became dominant at temperatures ranging from 21 to 30 degrees C at almost all salinities. There was no significant variation in the cellular toxin amount from 18 degrees C...
Tipo: Text
Palavras-chave: Alexandrium catenella; PSP toxins; Temperature; Salinity; Light.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00148/25969/24056.pdf

Is temperature a good proxy for sulfide in hydrothermal vent habitats?
Provedor de dados: 5
Autores: Le Bris, Nadine; Rodier, Philippe; Sarradin, Pierre-marie; Le Gall, Christian.
On the basis of previous studies at 9 degrees N and 13 degrees N East Pacific Rise (EPR) fields, we discuss the general assumption that temperature is a proxy for sulfide in vent fauna habitat. The main conclusion of these works is illustrated here through selected examples. In situ measurements were used to assess the variability of chemical parameters as function of temperature at the scale of fauna aggregations. Over a single vent site, aggregations of mussels or Riftia pachyptila discretely distributed around diffuse vents exhibit, in first assumption, similar sulfide-temperature correlation. In contrast, sulfide is much higher, for a given temperature, in the habitat of alvinellids than in neighboring habitats of Riftia pachyptila. Some consistency in...
Tipo: Text
Palavras-chave: Alvinellids; Riftia pachyptila; Mussel beds; Temperature; Sulfide; Hydrothermal vent.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-3609.pdf

The Role of Sustained Photoprotective Non-photochemical Quenching in Low Temperature and High Light Acclimation in the Bloom-Forming Arctic Diatom Thalassiosira gravida
Provedor de dados: 5
Autores: Lacour, Thomas; Lariviere, Jade; Ferland, Joannie; Bruyant, Flavienne; Lavaud, Johann; Babin, Marcel.
Thalassiosira gravida is a major Arctic diatom responsible for the under-ice spring bloom. We investigated T. gravida physiological plasticity growing it at two temperatures (0 and 5°C) and under different light intensities typically found in its natural environment. T. gravida showed remarkable thermal- and photo-acclimatory plasticity including: low light saturation parameter for growth (KE) and photosynthesis (EK), low μmax but relatively high Chl a/C, low C/N, and decreasing light-saturated carbon fixation rate (PmC) with increasing growth irradiance. T. gravida also showed remarkable photoprotective features, namely a strong sustained non-photochemical quenching (NPQs, hour kinetics relaxation) supported by a high amount of xanthophyll cycle pigments....
Tipo: Text
Palavras-chave: Arctic diatom; Photosynthesis; Sustained NPQ; Irradiance; Temperature.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00462/57387/59468.pdf

Dynamics of gas hydrate: case of the Congo continental slope
Provedor de dados: 5
Autores: Sultan, Nabil; Foucher, Jean-paul; Cochonat, Pierre; Tonnerre, T; Bourillet, Jean-francois; Ondreas, Helene; Cauquil, E; Grauls, D.
A numerical model is developed to study the temperature effect on stability and phase transformation of gas-hydrate. The model uses a mathematical formulation based on the enthalpy form of the conservation law of energy. The use of the enthalpy form instead of the temperature form as often done in the literature has made the problem numerically simpler. The model is then applied to describe the effect of sea bottom temperature variations on the stability of gas hydrate occurrences and on the seafloor reflectivity in sediments of the Congo continental slope. Indeed, a migrating seafloor reflectivity front is observed on 3D seimic images from two surveys performed 6 months apart and interpreted as a migrating gas hydrate stability zone. Seawater temperature...
Tipo: Text
Palavras-chave: Temperature; Stefan problem; Seafloor reflectivity; Gas hydrate; Heat flow; Finite difference; Continental margins.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/publication-702.pdf

Influence of water temperature and oxygenation on the aerobic metabolic scope of Atlantic cod (Gadus morhua)
Provedor de dados: 5
Autores: Claireaux, Guy; Webber, D; Lagardere, Jean-paul; Kerr, S.
Environmental influences (temperature and oxygenation) on cod metabolism and their impact on the ecology of this species were investigated. Limiting oxygen concentration curves (O-2 level ranging between 15 and 100% air saturation) were established at 2, 5 and 10 degreesC. The standard metabolic rate (SMR), the maximum metabolic rate and the metabolic score were then modelled as functions of temperature and/or oxygen saturation. The mean SMR at 2, 5 and 10 degreesC were 19.8 +/- 4.9, 30.8 +/- 6.1 and 54.3 +/- 4.1 mg O-2 h(-1) kg(-1). respectively. Between 2 and 5 degreesC, the active metabolic rate of cod almost doubled from 65 to 120 mg O-2 h(-1) kg(-1), to reach 177 mg O-2 h(-1) kg(-1) at 10 degreesC. In terms of metabolic scope (MS), the temperature...
Tipo: Text
Palavras-chave: Oxygen; Temperature; Physiological ecology; Metabolism; Atlantic cod.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/2000/publication-428.pdf

Characteristics of the convergence zone at the eastern edge of the Pacific warm pool
Provedor de dados: 5
Autores: Maes, Christophe; Picaut, Joël; Kuroda, Yoshifumi; Ando, Kentaro.
The characteristics of the convergence zone at the eastern edge of the equatorial Pacific warm pool are studied using a compilation of in-situ current and salinity measurements during the period 1992-2001. The displacement of the convergence zone is observed, for the first time, as far west as 140degreesE in the far western Pacific, mainly during La Nina periods, and near 140degreesW in the central Pacific during the 1997-98 El Nino. The convergence zone may be associated with a salinity front dividing the fresh waters of the warm pool from the salty waters upwelled in the central equatorial Pacific. Despite a zonal displacement ranging over about one fifth of the equatorial circumference of the earth, the characteristics of the main parameters involved in...
Tipo: Text
Palavras-chave: Nino la nina; El nino; Salinity variability; Southern oscillation; Fresh pool; Sea level; Displacements; Temperature; Model; Ocean.
Ano: 2004
URL: https://archimer.ifremer.fr/doc/00208/31888/30307.pdf

Environmental anomalies, energetic reserves and fatty acid modifications in oysters coincide with an exceptional mortality event
Provedor de dados: 5
Autores: Pernet, Fabrice; Barret, Jean; Marty, Claire; Moal, Jeanne; Le Gall, Patrik; Boudry, Pierre.
Mortality of oysters Crassostrea gigas occurred along the coasts of France during summer 2008, causing a serious crisis in French oyster production. During spring to summer 2008, 5 groups of 1-yr old oysters of different origins and ploidy levels deployed in the Thau lagoon (France) were sampled for biometrical and biochemical analyses; environmental parameters were monitored in the same area. Mortality occurred in 2 episodes: 13 May to 10 June and 24 June to 9 July. Wild-collected oysters showed mortality sooner than other groups but total overall mortality was 85% in all groups. Mortality occurred when seawater temperature was &gt;19 degrees C during the reproductive season when energetic reserves of oysters were at their lowest. Energy reserve levels...
Tipo: Text
Palavras-chave: Bivalves; Energetic reserve; Environment; Fatty acid; Summer mortality; Trophic signatures; Temperature.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00003/11388/7964.pdf

Oyster sex determination is influenced by temperature - First clues in spat during first gonadic differentiation and gametogenesis
Provedor de dados: 5
Autores: Santerre, Christelle; Sourdaine, Pascal; Marc, Nicolas; Mingant, Christian; Robert, Rene; Martinez, Anne-sophie.
The sex-determining system of Crassostrea gigas is still poorly known, especially regarding the potential influence of temperature. In order to address this question, mRNA expressions of actors of the molecular cascade (Cg-DMI, Cg-SoxE, Cg-beta-catenin, Cg-Foxl2/Cg-FoxI2os) and of Oyvlg, a germ cell marker, were investigated by real-time PCR in spat grown at different temperatures (18, 22, 25 and 28 degrees C). In parallel, gonadic differentiation, gametogenesis and sex ratios were assessed by histology at each of these temperatures. Whatever the temperature, Cg-DMI, Cg-SoxE, Cg-beta-catenin and Oyvlg expressions peaked at the same developmental stage, always after Cg-Foxl2/Cg-Foxl2os (around 40-44 dpf for spat grown at 18 degrees C). Temperatures...
Tipo: Text
Palavras-chave: Oyster spat; Temperature; Sex ratio; TSD; Sex determination pathway.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00136/24767/22874.pdf

Influence of feeding regime and temperature on development and settlement of oyster   Ostrea edulis   (Linnaeus, 1758) larvae
Provedor de dados: 5
Autores: Robert, Rene; Vignier, Julien; Petton, Bruno.
Under controlled conditions of food density and temperature, larval performances (ingestion, growth, survival and settlement success) of the flat oyster, Ostrea edulis, were investigated using a flow-through rearing system. In the first experiment, oyster larvae were reared at five different phytoplankton densities (70, 500, 1500, 2500 and 3500 μm3 μL−1: ≈1, 8, 25, 42 and 58 cells μL−1 equivalent TCg), and in the second, larvae were grown at four different temperatures (15, 20, 25 and 30°C). Overall, larvae survived a wide range of food density and temperature, with high survival recorded at the end of the experiments. Microalgae concentration and temperature both impacted significantly larval development and settlement success. A mixed diet of Chaetoceros...
Tipo: Text
Palavras-chave: Ostrea edulis; Larvae; Temperature; Feeding regime; Flow-through; DEB parameters.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00377/48817/49295.pdf

Effect of oxygen and temperature on the dynamic of the dominant bacterial populations of pig manure and on the persistence of pig-associated genetic markers, assessed in river water microcosms
Provedor de dados: 5
Autores: Marti, R.; Mieszkin, Sophie; Solecki, O.; Pourcher, A. -m.; Hervio-heath, Dominique; Gourmelon, Michele.
Aims: The aim is to evaluate the dynamic of Bacteroides-Prevotella and Bacillus-Streptococcus-Lactobacillus populations originating from pig manure and the persistence of pig-associated markers belonging to these groups according to temperature and oxygen. Methods and Results: River water was inoculated with pig manure and incubated under microaerophilic and aerobic conditions, at 4 and 20 degrees C over 43 days. The diversity of bacterial populations was analysed by capillary electrophoresis-single-strand conformation polymorphism. The persistence of the pig-associated markers was measured by real-time PCR and compared with the survival of Escherichia coli and enterococci. Decay was characterized by the estimation of the time needed to produce a 1-log...
Tipo: Text
Palavras-chave: Lactobacillus amylovorus; Microbial source tracking; Oxygen; Persistence; Pig-associated Bacteroidales markers; Quantitative real-time PCR; River water; Temperature.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00053/16470/14534.pdf

First insights into macro-and meiofaunal colonisation patterns on paired wood/slate substrata at Atlantic deep-sea hydrothermal vents
Provedor de dados: 5
Autores: Cuvelier, Daphne; Beesau, Julie; Ivanenko, Viatcheslav; Zeppilli, Daniela; Sarradin, Pierre-marie; Sarrazin, Jozee.
In 2006, paired wood and slate panels, each equipped with a temperature probe, were deployed on three different localities on and around the Eiffel Tower edifice (Lucky Strike vent field, Mid-Atlantic Ridge) within close proximity of visible hydrothermal activity. Recovery of these panels took place in 2008. For this two-year deployment period, the composition of colonising organisms (both macro-and meiofauna) was assessed, along with image analyses of the deployment sites in 2006 and 2008. Very few significant differences in colonisation between organic (wood) and inorganic (slate) panels were revealed. Rather, the locality of deployment and the local environmental conditions and hydrothermal activity were found to influence taxonomic composition....
Tipo: Text
Palavras-chave: Colonisation; Organic and inorganic substrata; Mid-Atlantic Ridge; Hydrothermal; Recruitment; Diversity; Temperature.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00180/29090/27505.pdf

Influence of low temperatures on the survival of the Pacific oyster (Crassostrea gigas) infected with Ostreid herpesvirus type 1
Provedor de dados: 5
Autores: Pernet, Fabrice; Tamayo, David; Petton, Bruno.
Mortalities of oyster seed of Crassostrea gigas associated with ostreid herpes virus OsHV-1 μVar have been observed in many oyster producing countries since 2008. The objective of this study was to further investigate whether low temperature treatments can offer a viable option to mitigate oyster mortalities. An experiment was set-up to further evaluate the effect of low temperature treatments (10 and 13°C vs. 21°C) and their duration (6 d to 83 d) on the survival of oysters previously infected with OsHV-1 μVar by means of exposure to field conditions in areas where mortalities were occurring. Average survival of oysters infected with OsHV-1μVar was 71% after 83 d at low temperatures compared to only 23% in controls maintained at 21°C. During...
Tipo: Text
Palavras-chave: Bivalve; Disease; OsHV-1; Oyster; Temperature; Virus.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00259/37047/35555.pdf

Sea Surface Salinity and Temperature Budgets in the North Atlantic Subtropical Gyre during SPURS Experiment: August 2012-August 2013
Provedor de dados: 5
Autores: Sommer, Anna; Reverdin, Gilles; Kolodziejczyk, Nicolas; Boutin, Jacqueline.
Variability at large to meso-scale in sea surface salinity (SSS) and sea surface temperature (SST) is investigated in the subtropical North Atlantic Ocean during the Subtropical Atlantic Surface Salinity Experiment Strasse/SPURS in August 2012—August 2013. The products of the Soil Moisture and Ocean Salinity (SMOS) mission corrected from large scale systematic errors are tested and used to retrieve meso-scale salinity features, while OSTIA products, resolving meso-scale temperature features are used for SST. The comparison of corrected SMOS SSS data with drifter's in situ measurements from SPURS experiment shows a reasonable agreement, especially during winter time with RMS differences on the order of 0.15 pss (for 10 days, 75 km resolution SMOS product)....
Tipo: Text
Palavras-chave: Salinity; Temperature; Budget; Meso-scale; Advection; SMOS; SPURS.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00468/57933/60319.pdf

The silicon isotopic composition of fine-grained river sediments and its relation to climate and lithology
Provedor de dados: 5
Autores: Bayon, Germain; Delvigne, C.; Ponzevera, Emmanuel; Borges, A. V.; Darchambeau, F.; De Deckker, P.; Lambert, T.; Monin, L.; Toucanne, Samuel; Andre, L.
The δ30Si stable isotopic composition of silicon in soils and fine-grained sediments can provide insights into weathering processes on continents, with important implications on the Si budget of modern and past oceans. To further constrain the factors controlling the distribution of Si isotopes in sediments, we have analysed a large number (n=50) of separate size-fractions of sediments and suspended particulate materials collected near the mouth of rivers worldwide. This includes some of the world’s largest rivers (e.g. Amazon, Congo, Mackenzie, Mississippi, Murray-Darling, Nile, Yangtze) and rivers from the case study areas of the Congo River Basin and Northern Ireland. Silt-size fractions exhibit a mean Si isotopic composition (δ30Si = -0.21 ± 0.19‰; 2...
Tipo: Text
Palavras-chave: World rivers; Congo basin; Northern Ireland; Si isotopes; Clay minerals; Weathering; Temperature; Precipitation.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00434/54609/55991.pdf

Factors influencing primary production of seagrass beds (Zostera noltii Hornem.) in the Thau lagoon (French Mediterranean coast)
Provedor de dados: 5
Autores: Plus, Martin; Deslous-paoli, Jean-marc; Auby, Isabelle; Dagault, Francoise.
The primary production and the respiration of Zostera noltii beds in the Thau lagoon were studied by means of the benthic bell jar technique, Concurrently, environmental data (temperature, light and nutrients) as well as morphological data of seagrass meadows (leaf width and height, density of shoots, above/below-ground biomass ratio) were collected with the purpose of explaining most of the observed variations in metabolism, Seagrass plus epiphyte respiration rates were influenced mainly by the water temperature, showing a typical exponential response to an increase in temperature, Surprisingly, measurements of production rates were not related to incoming light intensities recorded at the seagrass canopy level, An equation frequently used for terrestrial...
Tipo: Text
Palavras-chave: Nitrogen contents; Temperature; Intercepted light by canopies; Seagrass ecosystem; Primary production.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/2001/publication-458.pdf

Effects of temperature on herpes-like virus detection among hatchery-reared larval Pacific oyster Crassostrea gigas
Provedor de dados: 5
Autores: Le Deuff, Rose-marie; Renault, Tristan; Gerard, Andre.
This paper describes effects of temperature on herpes-like virus detection in Pacific oyster Crassostrea gigas larvae held at different temperatures. Intranuclear, intracytoplasmic and extracellular viral particles were observed in velum and mantle connective tissues of oyster larvae reared at 25-26°C. In larvae held at 22-23OC, although nuclear lesions were observed, the presence of viral particles was not detected. Results were obtained for oyster larvae with 4 different parental origins. Herpesvirus infection was found in 3 of the 4 groups of oyster larvae held In the same conditions at the higher temperature.
Tipo: Text
Palavras-chave: Temperature; Mortality; Larval culture; Crassotrea gigas; Pacific oyster; Herpesvirus.
Ano: 1996
URL: http://archimer.ifremer.fr/doc/1996/publication-2900.pdf

Etalonnage de capteurs de température et conductivité, et détermination des incertitudes de mesure associées
Provedor de dados: 5
Autores: Jacqueline, Franck.
The first aim of this experimentation is to calculate uncertainty of measurement fo Ysi 6560 and wTw LF 197's sensors. in a second time we shall try to quantify the influence of the choice of the calibration point for the quality of the measurements, in function of the environment measured.
Tipo: Text
Palavras-chave: Incertitude de mesure; Calibrage; Température; Salinité; Conductivité.; Uncertainity; Gauging; Temperature; Salinity; Conductivity.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/00175/28618/27046.pdf

Complex coupled metabolic and prokaryotic community responses to increasing temperatures in anaerobic marine sediments: critical temperatures and substrate changes
Provedor de dados: 5
Autores: Roussel, Erwan; Cragg, Barry A.; Webster, Gordon; Sass, Henrik; Tang, Xiaohong; Williams, Angharad S.; Gorra, Roberta; Weightman, Andrew J.; Parkes, R. John.
The impact of temperature (0 - 80°C) on anaerobic biogeochemical processes and prokaryotic communities in marine sediments (tidal flat) was investigated in slurries for up to 100 days. Temperature had a non-linear effect on biogeochemistry and prokaryotes with rapid changes over small temperature intervals. Some activities (e.g. methanogenesis) had multiple “windows” within a large temperature range (~10 - 80°C). Others, including acetate oxidation, had maximum activities within a temperature zone, which varied with electron acceptor (metal oxide [up to ~34°C] and sulphate [up to ~50°C]). Substrates for sulphate reduction changed from predominantly acetate below, and H2 above, a 43°C critical temperature; along with changes in activation energies and types...
Tipo: Text
Palavras-chave: Sediment; Temperature; Anaerobic processes; Chemoorganotrophic; Chemolithotrophic; Mineralisation; Sulphate reduction; Methanogenesis; Acetogenesis.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00273/38464/36883.pdf

Experiences de reproduction artificielle de Loup Dicentrarchus labrax (Linne 1758).
Provedor de dados: 5
Autores: Barnabe, G.; Tournamille, J.-c.
Mature eggs were expressed from captured female and fertilised artificially with slightly bloody sperm, in dry conditions or in a humid atmosphere, both at 13 degree C. The best incubation conditions proved to be 13 degree C, with streptomycin and penicillin. Another sample was kept at 18 degree C. Hatching occurred after 4 or 5 days, larvae showing positive phototropism. The system of renewal of water and artificial food is described. The embryonic reserve drop of lipid disappeared between day 14 and 16. Observations on larvae were like previous ones, but live larvae had larger mouths than had fixed specimens, and it was found that temperatures of 13 degree C or 18 degree C were suitable beyond the egg stage. A sudden change in temperature caused by a...
Tipo: Text
Palavras-chave: Temperature; Sperm; Eggs; Dicentrarchus labrax; Artificial reproduction.
Ano: 1972
URL: http://archimer.ifremer.fr/doc/1972/publication-2063.pdf

Hydrologie de la Mediterranée Occidentale au nord du 42e parallèle en automne 1958 (Campagne du navire « Président-Théodore-Tissier » du 27 septembre au 18 octobre 1958)
Provedor de dados: 5
Autores: Furnestin, Jean; Allain, Charles.
Tipo: Text
Palavras-chave: Mediterranean sea; Temperature; Salinity; Hydrology.
Ano: 1962
URL: http://archimer.ifremer.fr/doc/00127/23788/21698.pdf

Physiological basis of interactive responses to temperature and salinity in coastal marine invertebrate: Implications for responses to warming
Provedor de dados: 5
Autores: Torres, Gabriela; Charmantier, Guy; Wilcockson, David; Harzsch, Steffen; Giménez, Luis.
Developing physiological mechanistic models to predict species’ responses to climate‐driven environmental variables remains a key endeavor in ecology. Such approaches are challenging, because they require linking physiological processes with fitness and contraction or expansion in species’ distributions. We explore those links for coastal marine species, occurring in regions of freshwater influence (ROFIs) and exposed to changes in temperature and salinity. First, we evaluated the effect of temperature on hemolymph osmolality and on the expression of genes relevant for osmoregulation in larvae of the shore crab Carcinus maenas. We then discuss and develop a hypothetical model linking osmoregulation, fitness, and species expansion/contraction toward or away...
Tipo: Text
Palavras-chave: Carcinus maenas; Climate change; Coastal zone; Larva; MRNA expression; Multiple stressors; Osmoregulation; Salinity; Temperature.
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00692/80408/83516.pdf

Acumulación de ácido araquidónico en fosfolípidos y triglicéridos y producción de prostaglandinas con relación a estrés térmico en semilla de ostión Crassostrea gigas
Provedor de dados: 5
Autores: Duran Encinas, Yazmin.
Crassostrea gigas is a marine invertebrate that inhabits the intertidal zone and therefore, is commonly exposed to multiple environmental stressors, including temperature. In recent years mass mortality events have been reported in Mexico in C. gigas associated with the increase in temperature during the summer. Organisms under thermal stress present an increase in prostaglandins (PG) production by cyclooxygenases (COX), an enzymatic route using arachidonic acid (ARA) present in the phospholipids (FL) of the cell membrane as substrate, but PG can also increase non-enzymatically by reactive oxygen species (ROS) that are produced during increased metabolism. It has been reported that some organisms exposed to stress accumulate a higher concentration of ARA...
Tipo: Text
Palavras-chave: Arachidonic acid; Stress; Phospholipid; Isotope; Mollusk; Temperature; Triglyceride; Prostaglandin.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00620/73193/72387.pdf

Argo Data 1999–2019: Two Million Temperature-Salinity Profiles and Subsurface Velocity Observations From a Global Array of Profiling Floats
Provedor de dados: 5
Autores: Wong, Annie P. S.; Wijffels, Susan E.; Riser, Stephen C.; Pouliquen, Sylvie; Hosoda, Shigeki; Roemmich, Dean; Gilson, John; Johnson, Gregory C.; Martini, Kim; Murphy, David J.; Scanderbeg, Megan; Bhaskar, T. V. S. Udaya; Buck, Justin J. H.; Merceur, Frederic; Carval, Thierry; Maze, Guillaume; Cabanes, Cécile; André, Xavier; Poffa, Noe; Yashayaev, Igor; Barker, Paul M.; Guinehut, Stéphanie; Belbéoch, Mathieu; Ignaszewski, Mark; Baringer, Molly O'Neil; Schmid, Claudia; Lyman, John M.; Mctaggart, Kristene E.; Purkey, Sarah G.; Zilberman, Nathalie; Alkire, Matthew B.; Swift, Dana; Owens, W. Brechner; Jayne, Steven R.; Hersh, Cora; Robbins, Pelle; West-mack, Deb; Bahr, Frank; Yoshida, Sachiko; Sutton, Philip J. H.; Cancouët, Romain; Coatanoan, Christine; Dobbler, Delphine; Juan, Andrea Garcia; Gourrion, Jerome; Kolodziejczyk, Nicolas; Bernard, Vincent; Bourlès, Bernard; Claustre, Hervé; D'Ortenzio, Fabrizio; Le Reste, Serge; Le Traon, Pierre-yves; Rannou, Jean Philippe; Saout-grit, Carole; Speich, Sabrina; Thierry, Virginie; Verbrugge, Nathalie; Angel-benavides, Ingrid M.; Klein, Birgit; Notarstefano, Giulio; Poulain, Pierre-marie; Vélez-belchí, Pedro; Suga, Toshio; Ando, Kentaro; Iwasaska, Naoto; Kobayashi, Taiyo; Masuda, Shuhei; Oka, Eitarou; Sato, Kanako; Nakamura, Tomoaki; Sato, Katsunari; Takatsuki, Yasushi; Yoshida, Takashi; Cowley, Rebecca; Lovell, Jenny L.; Oke, Peter R.; Van Wijk, Esmee M.; Carse, Fiona; Donnelly, Matthew; Gould, W. John; Gowers, Katie; King, Brian A.; Loch, Stephen G.; Mowat, Mary; Turton, Jon; Rama Rao, E. Pattabhi; Ravichandran, M.; Freeland, Howard J.; Gaboury, Isabelle; Gilbert, Denis; Greenan, Blair J. W.; Ouellet, Mathieu; Ross, Tetjana; Tran, Anh; Dong, Mingmei; Liu, Zenghong; Xu, Jianping; Kang, Kiryong; Jo, Hyeongjun; Kim, Sung-dae; Park, Hyuk-min.
In the past two decades, the Argo Program has collected, processed, and distributed over two million vertical profiles of temperature and salinity from the upper two kilometers of the global ocean. A similar number of subsurface velocity observations near 1,000 dbar have also been collected. This paper recounts the history of the global Argo Program, from its aspiration arising out of the World Ocean Circulation Experiment, to the development and implementation of its instrumentation and telecommunication systems, and the various technical problems encountered. We describe the Argo data system and its quality control procedures, and the gradual changes in the vertical resolution and spatial coverage of Argo data from 1999 to 2019. The accuracies of the...
Tipo: Text
Palavras-chave: Global; Ocean; Pressure; Temperature; Salinity; Argo; Profiling; Floats.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00652/76377/77385.pdf

Husbandry stress during early life stages affects the stress response and health status of juvenile sea bass, Dicentrarchus labrax
Provedor de dados: 5
Autores: Varsamos, S; Flik, G; Pepin, Jean-francois; Bonga, S; Breuil, Gilles.
In aquaculture management it is important to establish objective criteria to assess health and welfare of the fish. Here we show that European sea bass (Dicentrarchus labrax) confronted with husbandry-associated stress (tank cleaning, i.e. scrubbing, and water temperature variation) during early life stages show poorer survival and disease resistance as juveniles. We evaluated several parameters for stress (plasma cortisol, glucose and lactate, hydromineral status), growth performance, the immune response (plasma IgM levels) and the effects of a nodavirus challenge. Principal component analysis allowed the establishment of a stress panel including plasma cortisol, osmolality, IgM levels and weight. Sea bass juveniles reared during early life in high and...
Tipo: Text
Palavras-chave: Dicentrarchus labrax; Nodavirus challenge; Scrubbing; Temperature; Welfare; Health; Allostasis; Stress.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-2395.pdf

Variability in the onset of hatching of Maja brachydactyla Balss, 1922 (Brachyura: Majidae) in the English Channel in relation to sea temperature
Provedor de dados: 5
Autores: Martin, Jocelyne; Planque, Benjamin.
Long-term monitoring of zooplankton and temperature has been carried out at the nuclear power station of Flamanville (west coast of Cotentin, English Channel, France) since 1977. Zooplankton sampling and temperature measurements took place at fortnightly intervals, particularly during the spring and summer. In addition, daily records of water temperature were recorded since 1986. The seasonal appearance of Maja brachydactyla Balss, 1922 first stage zoeae in the plankton outside the thermal plume near to the power station can greatly vary from year-to-year. Earliest observations have occurred in early June whilst latest observations were made at the end of July. During the period of study, temperature records display a warming trend whilst hatching is...
Tipo: Text
Palavras-chave: Temperature; Larvae; Hatching; Maja brachydactyla.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-1349.pdf

Spatial variation in growth, maturation schedules and reproductive investment of female sole Solea solea in the Northeast Atlantic
Provedor de dados: 5
Autores: Mollet, Fabian M.; Engelhard, Georg; Vainikka, Anssi; Laugen, Ane; Rijnsdorp, Adriaan D.; Ernande, Bruno.
Latitudinal variation in life-history traits is often explained by phenotypically plastic responses or local adaptations to different thermal regimes. We compared growth, maturation schedules and reproductive investment of female sole Solea solea between 8 populations, covering much of the species' distribution in northern Europe, with respect to thermal gradients. An energy allocation model was fitted to size–age data, and probabilistic maturation reaction norms were estimated from size–age–maturity data. We found that northern populations from colder environments had higher rates of energy acquisition and reproductive investment, an intrinsic tendency to mature earlier, and had smaller asymptotic sizes than southern populations from warmer environments....
Tipo: Text
Palavras-chave: Countergradient variation; Phenotypic plasticity; Growth; Maturation reaction norm; Temperature; Mortality-induced evolution.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00124/23523/21360.pdf

Effects of temperature on the growth of pollack (Pollachius pollachius) juveniles
Provedor de dados: 5
Autores: Person, Jeannine; Buchet, Vincent; Vincent, Benoit; Le Delliou, Herve; Quemener, Loic.
Growth of juvenile pollack was assessed at five constant temperatures (9, 12, 15, 18 and 21 degrees C) in an 84-day trial. Duplicate groups of 75 fish (initial weight 143 +/- 2 g) were held in O-2 saturated water (102-103% saturation) and fed to apparent satiation. Growth increased as temperature increased from 9 degrees C up to a plateau at 12-15 degrees C (NS differences between 12 and 15 degrees C) followed by a decrease from 18 degrees C. No growth occurred at 21 degrees C. For the overall period, specific growth rates were 0.52% and 0.53% day(-1) at 12 and 15 degrees C compared to 0.40% day(-1) at 18 degrees C. Feed intake was maximum at 15-18 degrees C (0.68-0.69% day(-1)) and it was significantly lower at 21 degrees C (0.45% day(-1)). Apparent feed...
Tipo: Text
Palavras-chave: Feed efficiency; Growth; Temperature; Pollack.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-1122.pdf

Influence of water temperature on the economic value of growth rate in fish farming: The case of sea bass (Dicentrarchus labrax) cage farming in the Mediterranean
Provedor de dados: 5
Autores: Besson, M.; Vandeputte, Marc; Van Arendonk, J. A. M.; Aubin, J.; De Boer, I. J. M.; Quillet, E.; Komen, H.
In sea cage farming, fish are exposed to seasonal variations of water temperature, and these variations can differ from one location to another. A small increase in water temperature does not only stimulate growth of the fish (until an optimal level) but also lowers dissolved oxygen concentration in water. Dissolved oxygen may then become a rearing constraint during the production cycle if the oxygen requirement of fish is higher than the supply. The impact of this constraint on production parameters (stocking density of cages and/or batch rotation) and thus on economic profit of a farm will depend on both local thermal regime and growth potential of the fish. Increased growth is one of the most important traits in a breeding objective to increase...
Tipo: Text
Palavras-chave: Economic values; Bioeconomic model; Fish farming; Genetic improvement; Temperature; Thermal growth coefficient.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00332/44361/43964.pdf

Interaction de la bactérie Vibrio harveyi avec son hôte, l'hormeau Haliotis tuberculata : approches physiologiques, cellulaires et moléculaires
Provedor de dados: 5
Autores: Travers, Marie-agnes.
Abalone aquaculture only recently developed in western Europe, but already it has to face numerous pathologies. Since 1998, the natural and farm stocks of Haliotis tuberculata suffer regularly high mortalities, mainly due to the pathogenic bacterium, Vibrio harveyi. The vibriosis of the European abalone, in particular its macroscopic signs, and the conditions necessary for its development have been studied in detail by field and laboratory experiments. We have been able to show the importance of the interplay between water temperature (&gt;17°C), animal physiology (reproduction period) and a pathogenic strain (harbouring the plasmid pVCR1) for the development of this abalone disease. A limited localisation study of the abalone target tissues (gills, muscle...
Tipo: Text
Palavras-chave: Ormeau; Haliotis tuberculata; Bactéries; Vibrio harveyi; Vibriose; Température; Immunité; Reproduction; Hémocytes; MAP Kinases; Plasmide; Virulence; GFP; Abalone; Haliotis tuberculata; Bacteria; Vibrio harveyi; Vibriosis; Temperature; Immunity; Reproduction; Haemocytes; MAP Kinases; Plasmid; Virulence; GFP.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/00176/28729/27196.pdf

Context dependency of trait repeatability and its relevance for management and conservation of fish populations
Provedor de dados: 5
Autores: Killen, S. S.; Adriaenssens, B.; Marras, S.; Claireaux, Guy; Cooke, S. J.
Repeatability of behavioural and physiological traits is increasingly a focus for animal researchers, for which fish have become important models. Almost all of this work has been done in the context of evolutionary ecology, with few explicit attempts to apply repeatability and context dependency of trait variation toward understanding conservation-related issues. Here, we review work examining the degree to which repeatability of traits (such as boldness, swimming performance, metabolic rate and stress responsiveness) is context dependent. We review methods for quantifying repeatability (distinguishing between within-context and across-context repeatability) and confounding factors that may be especially problematic when attempting to measure...
Tipo: Text
Palavras-chave: Environmental effects; Intraclass correlation; Personality; Phenotypic plasticity; Reaction norm; Temperature.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00337/44823/44372.pdf

Rapid metabolic adaptation in European sea bass (Dicentrarchus labrax) juveniles fed different carbohydrate sources after heat shock stress
Provedor de dados: 5
Autores: Enes, P; Panserat, S; Kaushik, Sadasivam; Oliva Teles, A.
A study was conducted to evaluate the effect of two dietary carbohydrate sources (waxy maize starch and glucose) on the metabolic adaptation of sea bass juveniles (initial weight: 24 g) to a heat shock treatment (temperature rise from 18 degrees C to 25 degrees C within 24 h). Two isonitrogenous and isolipidic diets were fon-nulated to contain 20% waxy maize starch (WS diet) or 20% glucose (GLU diet). Triplicate groups of fish were fed to near satiation for 4 weeks at both temperatures (18 degrees C and 25 degrees C). Then, fish previously maintained at 18 degrees C were submitted to a heat shock (18 degrees C to 25 degrees C) and continued to be fed with the same diets during I more week. The higher water temperature significantly improved growth...
Tipo: Text
Palavras-chave: Waxy maize starch; Temperature; Lipogenic enzymes; HSP70; Glycolytic enzymes; Glucose; Gluconeogenic enzymes; European sea bass; Carbohydrate utilization; Biomarker.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-6958.pdf

Latitude, temperature, and habitat complexity predict predation pressure in eelgrass beds across the Northern Hemisphere
Provedor de dados: 5
Autores: Reynolds, Pamela L.; Stachowicz, John J.; Hovel, Kevin; Bostrom, Christoffer; Boyer, Katharyn; Cusson, Mathieu; Eklof, Johan S.; Engel, Friederike G.; Engelen, Aschwin H.; Eriksson, Britas Klemens; Fodrie, F. Joel; Griffin, John N.; Hereu, Clara M.; Hori, Masakazu; Hanley, Torrance C.; Ivanov, Mikhail; Jorgensen, Pablo; Kruschel, Claudia; Lee, Kun-seop; Mcglathery, Karen; Moksnes, Per-olav; Nakaoka, Masahiro; O'Connor, Mary I.; O'Connor, Nessa E.; Orth, Robert J.; Rossi, Francesca; Ruesink, Jennifer; Sotka, Erik E.; Thormar, Jonas; Tomas, Fiona; Unsworth, Richard K. F.; Whalen, Matthew A.; Duffy, J. Emmett.
Latitudinal gradients in species interactions are widely cited as potential causes or consequences of global patterns of biodiversity. However, mechanistic studies documenting changes in interactions across broad geographic ranges are limited. We surveyed predation intensity on common prey (live amphipods and gastropods) in communities of eelgrass (Zostera marina) at 48 sites across its Northern Hemisphere range, encompassing over 37 degrees of latitude and four continental coastlines. Predation on amphipods declined with latitude on all coasts but declined more strongly along western ocean margins where temperature gradients are steeper. Whereas insitu water temperature at the time of the experiments was uncorrelated with predation, mean annual...
Tipo: Text
Palavras-chave: Biogeography; Latitude; Mesograzer; Predation; Seagrass; Species interactions; Temperature; Zostera.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00610/72246/71053.pdf

Influence de la température sur la consommation d'oxygène du bar juvénile, Dicentrarchus labrax L.
Provedor de dados: 5
Autores: Bical, C.; Lasserre, P.
This study quantifies the influence of temperature on the respiratory activity of juvenile Dicentrarchus labrax L. The fry were less than one year old and were obtained from the breeding tanks at the C.O.B. (Centre Océanologique de Bretagne). Diminution in the oxygen concentration, during time, within sealed ves­sels was measured with a Clark oxygen electrode (Orbisphere Material modified). Initially the respiratory rate was determined, for acclimatized fishes, as a function of the decrease in the oxygen concentration of the milieu at diffe­rent temperatures (8°, 10°, 15°, 20° and 25°C) and constant salinity 30 %o . The relationship between metabolism and weight, at these temperatures was then established for two different levels of activity "routine" and...
Tipo: Text
Palavras-chave: Respiration; Adaptations métaboliques; Méthode confinement; Température; Bar Dicentrarchus Zabrax L.; Respiratory metabolism; Sealed vessel; Temperature; Sea bass Dicentrarchus Zabrax L.
Ano: 1979
URL: http://archimer.ifremer.fr/doc/00306/41685/40894.pdf

Low oxygen levels can help to prevent the detrimental effect of acute warming on mitochondrial efficiency in fish
Provedor de dados: 5
Autores: Thoral, Elisa; Roussel, Damien; Chinopoulos, Christos; Teulier, Loïc; Salin, Karine.
Aerobic metabolism of aquatic ectotherms is highly sensitive to fluctuating climates. Many mitochondrial traits exhibit phenotypic plasticity in response to acute variations in temperature and oxygen availability. These responses are critical for understanding the effects of environmental variations on aquatic ectotherms' performance. Using the European seabass, Dicentrarchus labrax, we determined the effects of acute warming and deoxygenation in vitro on mitochondrial respiratory capacities and mitochondrial efficiency to produce ATP (ATP/O ratio). We show that acute warming reduced ATP/O ratio but deoxygenation marginally raised ATP/O ratio, leading to a compensatory effect of low oxygen availability on mitochondrial ATP/O ratio at high temperature. The...
Tipo: Text
Palavras-chave: ATP/O ratio; Mitochondrial respiratory capacities; Dissolved oxygen; Temperature.
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00679/79098/81571.pdf

Variability in the ICES/NAFO region between 1950 and 2009: observations from the ICES Report on Ocean Climate
Provedor de dados: 5
Autores: Hughes, Sarah L.; Holliday, N. Penny; Gaillard, Fabienne.
The ICES Report on Ocean Climate presents the latest information on the status and trends of sea temperature and salinity in the North Atlantic and Nordic Seas. It is the main product of the ICES Working Group on Oceanic Hydrography, published annually. Bringing together multiple time-series from across the ICES and NAFO regions offers insight into the concurrent spatial and temporal trends in ocean temperature and salinity. This paper presents an overview of the physical variability in the North Atlantic Ocean at decadal and longer time-scales and reviews the current state of understanding of the causes and mechanisms of this variability. Between the 1960s and the 1990s, the North Atlantic Oscillation (NAO) index increased from a persistent negative phase...
Tipo: Text
Palavras-chave: Circulation; Multidecadal variability; North Atlantic; Salinity; Temperature.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00087/19854/17513.pdf

Genetically based resistance to summer mortality in the Pacific oyster (Crassostrea gigas) and its relationship with physiological, immunological characteristics and infection processes
Provedor de dados: 5
Autores: Samain, Jean-francois; Degremont, Lionel; Soletchnik, Patrick; Haure, Joel; Bedier, Edouard; Ropert, Michel; Moal, Jeanne; Huvet, Arnaud; Bacca, Helene; Van Wormhoudt, A; Delaporte, Maryse; Costil, K; Pouvreau, Stephane; Lambert, Christian; Boulo, Viviane; Soudant, Philippe; Nicolas, Jean-louis; Leroux, Frederique; Renault, Tristan; Gagnaire, Beatrice; Geret, Florence; Boutet, Isabelle; Burgeot, Thierry; Boudry, Pierre.
Summer mortality of Pacific oysters is known in several countries. However no specific pathogen has been systematically associated with this phenomenon. A complex combination of environmental and biological parameters has been suggested as the cause and is now starting to be identified. A high genetic basis was found for survival in oysters when a first generation (G1) was tested in three sites during summer. This paper presents a synthesis on physiological characteristics of two selected groups ('R' and 'S', from families selected for resistance and susceptibility to summer mortality respectively), of the second and third generations. R and S showed improvement or reduction of survival compared with the control in both field and laboratory trials...
Tipo: Text
Palavras-chave: ROS; Temperature; Stress; Hemocytes; Reproduction; Genetic selection; Resistant oyster; Crassostrea gigas; Pacific Oyster; Summer mortality.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2809.pdf

Horizontal distribution and overlap of planktivorous fish stocks in the Norwegian Sea during summers 1995–2006
Provedor de dados: 5
Autores: Rong Utne, Kjell; Huse, Geir; Ottersen, Geir; Holst, Jens C.; Zabavnikov, Vladimir; Jacobsen, Jan A.; Óskarsson, Guđmundur J.; Nøttestad, Leif.
The Norwegian Sea harbours several large pelagic fish stocks, which use the area for feeding during the summer. The period 1995–2006 had some of the highest biomass of pelagic fish feeding in the Norwegian Sea on record. Here we address the horizontal distribution and overlap between herring, blue whiting and mackerel in this period during the summers using a combination of acoustic, trawl and LIDAR data. A newly developed temperature atlas for the Norwegian Sea is used to present the horizontal fish distributions in relation to temperature. The centre of gravity of the herring distribution changed markedly several times during the investigated period. Blue whiting feeding habitat expanded in a northwestern direction until 2003, corresponding with an...
Tipo: Text
Palavras-chave: Herring; Mackerel; Blue whiting; Temperature; Competition; Interaction.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00079/19018/16602.pdf

Croissance de jeunes palourdes (Venerupis semidecussata) en nurserie et en mer en fonction des conditions d'élevage
Provedor de dados: 5
Autores: Lucas, Albert.
The japanese palourde Venerupis semidecussata was reared in the Bay of Brest, using hatchery reared spat. Experiments were performed with individuals of lenght 2 to 10 mm raised in a nursery, using raceways with slow running water enriched with unicellular algae, And also with individuals of lenght 8 to 20 mm raised at sea in suspended culture. It was observed that growth depends upon four groups of factors : (1) the functioning and equipment of the raceways, (2) the quantity and quality of the food, (3) the temperature and (4) various physico-chemical factors. When the equipment is satisfactory and when the physico-chemical fac­tors are normal for the species in question, the rate of growth depends essen­tially on the quantity of food, provided that the...
Tipo: Text
Palavras-chave: Palourde; Venerupis; Bivalves; Croissance; Nourriture; Température; Nurserie; Culture suspendue; Aquaculture; Clam; Venerupis; Bivalves; Growth; Food; Temperature; Nursery; Suspended culture; Aquaculture.
Ano: 1979
URL: http://archimer.ifremer.fr/doc/00305/41657/40866.pdf

Eastern Tropical Atlantic Mixed Layer Depth: Assessment of Methods from In Situ Profiles in the Gulf of Guinea from Coastal to High Sea
Provedor de dados: 5
Autores: N’guessan, Benjamin Kouadio; Kouassi, Aka Marcel; Trokourey, Albert; Toualy, Elisée; Kanga, Desiré Kouamé; Brehmer, Patrice.
To assess the eastern Atlantic tropical mixed layer depth (MLD) at 4°W in the Gulf of Guinea, water temperature and density profiles from over five hundred historical observational Conductivity – Temperature - Depth (CTD) data were used. These data, obtained from key oceanographic survey databases covering 60 years (1956 to 2016) were used for a numerical and visual determination of the MLD. The numerical approach consists of the use of the algorithms of three methods; while the visual estimation of the MLD were made on both temperature and density profiles. The numerical approaches were evaluated by comparing their results on the determination of tropical MLD with those of the visual inspections by means of statistical and graphical analysis in order to...
Tipo: Text
Palavras-chave: Mixed layer depth; Gulf of Guinea; Atlantic Ocean; Density; Temperature.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00599/71115/75615.pdf

Metabolic and digestive activity profiles of newly hatched spotted wolffish (Anarhichas minor Olafsen): effect of temperature
Provedor de dados: 5
Autores: Savoie, A; Le Francois, N; Cahu, Chantal; Blier, P.
Three groups of newly hatched spotted wolffish (Anarhichas minor) were held at three different temperatures in order to determine relationships between metabolic, digestive and growth response in rapidly developing larvae. Growth rates were successfully modulated by temperature (5, 8 and 12 degrees C). Activity levels of trypsin and lactate dehydrogenase (LDH) were positively linked to specific growth rates at all temperatures. Trypsin showed a positive compensation (higher activity at lower temperature) whereas glycolytic enzymes (pyruvate kinase and Lactate dehydrogenase) and aspartate aminotransferase (AST) showed a negative compensation (lower activity at lower temperature). Citrate synthase was not affected by growth rate, indicating that the level of...
Tipo: Text
Palavras-chave: Anarhichas minor; Temperature; Growth; Energy metabolism; Digestive capacities.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-3810.pdf

Long-term series in ichthyoplankton: Sole and sprat at French coast of the North Sea from 1975 to 1994
Provedor de dados: 5
Autores: Woehrling, Daniel; Le Fevre-lehoerff, Geneviève.
The sampling of eggs and larvae of sole and sprat at Gravelines (French part of the North Sea coast) since 1975 has produced a long-term series showing major interannual changes, Comparison of the results obtained on two species, one benthic and the other one pelagic, suggests some events affecting the environment that are also revealed by the holoplanktonic (appendicularia, chaetognatha) and meroplanktonic (cirripeda larvae) compartment. This Study attempts also to distinguish general variations from more closely species-related fluctuations.
Tipo: Text
Palavras-chave: Séries temporelles; Cycles; Sole; Ichtyoplancton; Temperature; Biological series; Cycles; Sole; Ichthyoplankton; Temperature.
Ano: 1998
URL: https://archimer.ifremer.fr/doc/1998/publication-856.pdf

Effect of water temperature on individual reproductive activity of pollack (Pollachius pollachius)
Provedor de dados: 5
Autores: Suquet, Marc; Normant, Yvon; Gaignon, Jean-louis; Quemener, Loic; Fauvel, Christian.
The effects of water temperature on pollack (Pollachius pollachius) spawning features were individually assessed. During the spawning period, nine fish sets, each composed of one female and two males (mean body weight: 2.5+/-1.0 kg), were placed in small-volume tanks (2 m(3)). Fish sets were held at 8, 10, or 12 degreesC (n=3 for each temperature).   Three females released eggs at 8 and 10 degreesC, while only two spawned at 12 degreesC. One hundred thirty-one individual spawns were collected from the eight spawning fish sets. The number of spawns collected per female was significantly lower at 12 degreesC (3.0+/-3.6), compared to 10 degreesC (17.3+/-10.1) and 8 degreesC (23.3+/-2.5). Egg number (eggs kg(-1) BW) was significantly lowered at 12 degreesC...
Tipo: Text
Palavras-chave: Egg quality; Temperature; Reproduction; Pollachius pollachius; Pollack; Gadoids.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-470.pdf

Recruitment of mussels in the Pertuis Breston (France) in these last years. A preliminary analysis on the influence of temperature and sunshine
Provedor de dados: 5
Autores: Prou, Jean; Dardignac, Marie-jose.
Since 1979, the IFREMER Laboratory follows mussel recruitement in the Pertuis Breton. Gametogenesis generally begins in September or October and ends in Décember. Spawning may begin in Februrary and continues up ta the end of April, but it usually occurs in the second fortnigh of March. The most important settlement generaly runs after the middle of May up to the middle of June. Duririg the study period, four years are noticeable by lack of settlement : 1982, 1989, 1990 and 1991. This failure thraughout these three last years resulted in a breakdown of the cultivated biomass. The present paper outlines a preliminary analysis on the influence of temperature and sunshine.
Tipo: Text
Palavras-chave: Mussels; Recruitment; Temperature; Sunshine; Pertuis Breton.
Ano: 1993
URL: http://archimer.ifremer.fr/doc/00039/15064/12387.pdf

New insights into behavioural ecology of European seabass off the West Coast of France: implications at local and population scales
Provedor de dados: 5
Autores: De Pontual, Helene; Lalire, Maxime; Fablet, Ronan; Laspougeas, Claire; Garren, Francois; Martin, Stephane; Drogou, Mickael; Woillez, Mathieu.
From 2010 to 2012, 246 data storage tags were deployed on European seabass in the Iroise Natural Marine Park, a marine protected area (MPA) off west Brittany, France. A return rate of 14.6% associated with long time series of data provided new information on fish ecology (e.g. maximum experienced depth greater than 225 m, temperature range 6.80–21.87°C). Depth and temperature series were used to infer individual migration using an innovative hidden Markov model (HMM) especially developed for seabass geolocation. Reconstructed fish tracks revealed that seabass is a partially migratory species, as individuals exhibited either long-distance migrations towards the Bay of Biscay or the Celtic Sea, or residency behaviour in the Iroise Sea. Fidelity to summer...
Tipo: Text
Palavras-chave: Cod; Connectivity; Data Storage Tag (DST); Depth; European sea bass; Dicentrarchus labrax; Geolocation; Partial migration; Spawning site fidelity; Temperature; Vertical movement.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00451/56230/57790.pdf

Trade-off between thermal sensitivity, hypoxia tolerance and growth in fish
Provedor de dados: 5
Autores: Roze, Thomas; Christen, Felix; Amerand, Aline; Claireaux, Guy.
One outcome of contemporary climate trends is that the involvement of hypoxia and heat tolerance in determining individual fitness will increase in many fish populations. Large fish are believed to be more tolerant to hypoxia than small fish (Nilsson and Ostlund-Nilsson, 2008) whereas thermal sensitivity is thought to decrease with body size (Clark et al., 2008). To better understand the bases of inter-individual variation in environmental adaptation performance, the current study examined hypoxia and heat tolerance in a fast growing (FGS; 288.3 +/- 14.4 g, 26.04 +/- 0.49 cm) and a slow growing (SGS; 119.95 +/- 6.41 g; 20.98 +/- 0.41 cm) strain of 1-year old rainbow trout (Oncorhynchus mykiss). This examination was conducted using two standardized...
Tipo: Text
Palavras-chave: Fish; Hypoxia; Temperature; Trade-off; Growth; Body size.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00130/24104/22371.pdf

Hydrologie de la Mediterranée Occidentale au nord du 42e parallèle en automne 1958 (Campagne du navire « Président-Théodore-Tissier » du 27 septembre au 18 octobre 1958)
Provedor de dados: 5
Autores: Furnestin, Jean; Allain, Charles.
Tipo: Text
Palavras-chave: Mediterranean sea; Temperature; Salinity; Hydrology.
Ano: 1962
URL: http://archimer.ifremer.fr/doc/1962/publication-2232.pdf

Temperature influence on pathogen transmission and subsequent mortalities in juvenile Pacific oysters Crassostrea gigas
Provedor de dados: 5
Autores: Petton, Bruno; Pernet, Fabrice; Robert, Rene; Boudry, Pierre.
Since 2008, mass mortalities of 1-yr-old Crassostrea gigas associated with the ostreid herpesvirus OsHV-1 μVar have occurred along all the coasts of France when seawater temperature reaches 16 to 17°C. The present study aimed to characterize the effect of temperature on oyster survival in combination with OsHV-1 DNA quantification by standard real-time PCR and total vibrio population levels in oyster tissues. To examine the effect of seawater temperature on disease transmission and related mortality of oysters, cohabitation experiments were conducted between healthy naïve oysters and oysters previously exposed to field conditions in areas where mortalities were occurring. Oysters initially maintained in controlled conditions (free of mortality and negative...
Tipo: Text
Palavras-chave: Juvenile oyster; Pathology; Temperature; Survival; Vibrios; Ostreid herpesvirus 1.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00148/25891/23912.pdf

Physiological changes in Pacific oyster Crassostrea gigas exposed to the herpesvirus OsHV-1 μvar
Provedor de dados: 5
Autores: Tamayo, David; Corporeau, Charlotte; Petton, Bruno; Quere, Claudie; Pernet, Fabrice.
Since 2008, mass mortality events of Crassostrea gigas have been occurring along the French coast when seawater temperature exceeds 16ºC. These mortality events are related to a particular genotype of the ostreid herpesvirus named OsHV-1 μvar. The present study aimed to detail various physiological aspects underlying the onset of the disease. In the laboratory, both exposed (infected) and naïve (healthy) oysters were maintained at 13.0°C and 20.6ºC. These temperatures were respectively lower and higher than the threshold values of 16°C at which the disease generally occur. At 20.6ºC, exposed oysters were characterized by a reduction in energetic reserves (carbohydrates and triglycerides) together with a decrease in protein content. Sterols levels were...
Tipo: Text
Palavras-chave: Crassostrea gigas; Energetic reserves; Energetic metabolism; Enzyme activity; OsHV-1; Temperature.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00192/30330/28803.pdf

Feet, heat and scallops: what is the cost of anthropogenic disturbance in bivalve aquaculture?
Provedor de dados: 5
Autores: Robson, Anthony A.; Halsey, Lewis G.; Chauvaud, Laurent.
The effects of unnatural disturbances on the behaviour and energetics of animals are an important issue for conservation and commercial animal production. Biologging enables estimation of the energy costs of these disturbances, but not specifically the effect these costs have on growth; a key outcome measure for animal farming enterprises. We looked at how natural and anthropogenically induced activity and energy expenditure of king scallops Pecten maximus varies with temperature. These data were then used to model growth time of king scallops reared in an aquaculture facility under different temperatures and anthropogenic disturbance levels. The scallops exhibited a typical total metabolic rate (MR)-temperature curve, with a peak reached at a middling...
Tipo: Text
Palavras-chave: Growth; Temperature; Anthropogenic disturbance; Activity; Metabolic rate; Energy expenditure.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00344/45561/72893.pdf

Activite mecanique comparee des huitres portugaises et des Ciones, Epibiontes.
Provedor de dados: 5
Autores: Le Borgne-david, A.
The Portuguese oyster (Crassostrea angulata) and the sea-squirt Ciona intestinalis are both filter-feeders and compete for space in the oyster beds. Valve movement in oysters and shortening and elongation in Ciona were recorded on a smoked drum. Oysters showed a slow (3 one half min) spontaneous opening/closing rhythm, which was speeded up by stimulatory (vitamin) substances and increased in amplitude by toxic accumulated waste substances, or sudden change in temperature. Ciona showed a regular contraction rhythm of similar to 1 min and single sharp shortening after a strong light stimulus or a food particle touch stimulus to the oral tentacles. The neural ganglion discharges spikes 3 times faster than in the dark, after light stimulation. Filtration rates...
Tipo: Text
Palavras-chave: Stimulation; Rhythm; Temperature; Crassostrea angulata; Portuguese oyster.
Ano: 1972
URL: http://archimer.ifremer.fr/doc/1972/publication-2052.pdf

Impact of temperature on larval development and evolution of physiological indices in Crassostrea gigas
Provedor de dados: 5
Autores: Ben Kheder, Rym; Moal, Jeanne; Robert, Rene.
The effect of four temperatures, ranging between 17 degrees C and 32 degrees C, was studied on development and lipid reserve management of Crassostrea gigas larvae. No effect of temperature was found on larval mortality, as high survival (&gt;90%) was recorded before competence at all temperatures studied. Temperature did, nonetheless, have a strong effect on growth and settlement success. At low temperature (17 degrees C), larvae competent to metamorphose were only observed from day 23 and only a low percentage finally achieved metamorphosis (12%). The opposite was seen at temperatures &gt;= 27 degrees C: larval competence appeared at day 18 and led to high rates of metamorphosis (60-90%). This difference at settlement seemed to be linked to larval...
Tipo: Text
Palavras-chave: Crassostrea gigas; Larvae; Growth; Metamorphosis; Temperature; Lipids; Physiological indices.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00019/13046/10146.pdf

Combined effect of temperature and salinity on osmoregulation of juvenile and subadult Penaeus stylirostris
Provedor de dados: 5
Autores: Lemaire, Pierrette; Bernard, Eric; Martinez-paz, J; Chim, Liet.
In New Caledonia, the "syndrome 93," which results in mass mortalities of farmed shrimp Penaeus stylirostris, occurs during the transitional and the cold seasons. The transitional season is characterized by an important fall in the average water temperature from 28 to 19 degreesC in 2 weeks. Besides this marked temperature fall, there are also nyctemeral temperature changes of up to 7 degreesC in 12 h. The cold season is characterized by an average water temperature of 19 degreesC with extreme lows of 14 degreesC. The objective of this study was to determine the effect of temperature and its variations on the osmoregulatory capacity of juvenile (7-10 g average weight) and subadult (25 g average weight) shrimps subjected to conditions of different salinity....
Tipo: Text
Palavras-chave: Temperature; Salinity; Osmoregulatory capacity; Penaeus stylirostris; Shrimp.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/2002/publication-395.pdf

Assessing chronic fish health: An application to a case of an acute exposure to chemically treated crude oil
Provedor de dados: 5
Autores: Mauduit, Florian; Domenici, P.; Farrell, A. P.; Lacroix, C.; Le Floch, S.; Lemaire, P.; Nicolas-kopec, A.; Whittington, M.; Zambonino-infante, Jose-luis; Claireaux, Guy.
Human alteration of marine ecosystems is substantial and growing. Yet, no adequate methodology exists that provides reliable predictions of how environmental degradation will affect these ecosystems at a relevant level of biological organization. The primary objective of this study was to develop a methodology to evaluate a fish’s capacity to face a well-established environmental challenge, an exposure to chemically dispersed oil, and characterize the long-term consequences. Therefore, we applied high-throughput, non-lethal challenge tests to assess hypoxia tolerance, temperature susceptibility and maximal swimming speed as proxies for a fish’s functional integrity. These whole animal challenge tests were implemented before (1 month) and after (1 month)...
Tipo: Text
Palavras-chave: Fish; Oil spill; Dispersant; Biomarkers; Physiological integrity; Ecological performance; Temperature; Hypoxia; Swimming; Growth.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00347/45828/45916.pdf

Response of the blue shrimp Litopenaeus stylirostris to temperature decrease and hypoxia in relation to molt stage
Provedor de dados: 5
Autores: Mugnier, Chantal; Soyez, Claude.
The effect of different levels of dissolved oxygen (DO) and a decreased temperature combined with severe hypoxia were studied in the blue shrimp Litopenaeus stylirostris in relation to molt stage. In the first experiment, shrimps were submitted to DO concentrations of 5 to 1 mg l(-1). Osmoregulatory capacity (OC) was measured in shrimps at molt stage C after 6, 24, or 48 h of exposure. No mortality was recorded but a significant negative effect of DO concentration on hypo-OC was observed for DO concentrations below 3 mg l(-1). Osmoregulation improved after 48 h exposure, compared to 6 and 24 h exposure.   In a second experiment, temperature was decreased from 28 to 22 degreesC in 24 h, before a severe hypoxia of 0.5+/-0.1 mg O-2 l(-1) was applied....
Tipo: Text
Palavras-chave: Temperature; Stress; Penaeid shrimp; Osmoregulation; Molt stage; Litopenaeus stylirostris; Hypoxia.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-372.pdf

RESCO - Réseau d'observations Conchylicoles : Campagne 2013
Provedor de dados: 5
Autores: Fleury, Elodie.
The French network RESCO was developed in 2009, following the widespread mortalities in French oysters stocks of Crassostrea gigas that killed a majority of young cultivated oysters in summer 2008. The main objective of this network was to develop a tool of estimation of the mortalities at national scale, through a standardized monitoring of sentinel oysters In 2013, similar batches of spat and 18 month old oysters from different origins were deployed in thirteen sites located all along the French coasts to measure the spatial and temporal evolution of the mortality and growth rates. At the same time, the program provides a high-frequency recording of environmental parameters and the detection of the main infectious agents associated to the oyster...
Tipo: Text
Palavras-chave: Crassostrea gigas; Huître creuse; Mortalité; Croissance; Température; Enregistrement haute fréquence; Herpes virus; Vibrio aesturianus; Agent pathogène; Crassostrea gigas; Pacific oyster; Mortality; Growth; Temperature; High frequency data acquisition; Herpes virus; Vibrio aestuarianus; Infectious agent.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00197/30851/29212.pdf

Température et salinité dans l'Aber Benoît et l'Aber Wrach été 1991, rapport de mesures
Provedor de dados: 5
Autores: Merceron, Michel; Gaffet, Jean-dominique.
This report displays the data of temperature and salinity from the records performed in the Aber Wrach and Aber Benoît estuaries during the summer 1991. This work was decided after a massive oyster kill in the Aber Benoît estuary.
Tipo: Text
Palavras-chave: Brittany; Estuary; Salinity; Temperature; Bretagne; Estuaire; Salinité; Température.
Ano: 1991
URL: http://archimer.ifremer.fr/doc/1991/rapport-2659.pdf

Temperature modulate disease susceptibility of the Pacific oyster Crassostrea gigas and virulence of the Ostreid herpesvirus type 1
Provedor de dados: 5
Autores: Delisle, Lizenn; Petton, Bruno; Burguin, Jean Francois; Morga, Benjamin; Corporeau, Charlotte; Pernet, Fabrice.
Temperature triggers marine diseases by changing host susceptibility and pathogen virulence. Oyster mortalities associated with the Ostreid herpesvirus type 1 (OsHV-1) have occurred seasonally in Europe when the seawater temperature range reaches 16–24 °C. Here we assess how temperature modulates oyster susceptibility to OsHV-1 and pathogen virulence. Oysters were injected with OsHV-1 suspension incubated at 21 °C, 26 °C and 29 °C and were placed in cohabitation with healthy oysters (recipients) at these three temperatures according to a fractional factorial design. Survival was followed for 14 d and recipients were sampled for OsHV-1 DNA quantification and viral gene expression. The oysters were all subsequently placed at 21 °C to evaluate the potential...
Tipo: Text
Palavras-chave: Bivalve; Health; Marine disease; Mortality risk; Temperature; Virulence.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00442/55337/56847.pdf

Long-term fluctuations in bluefin tuna trap catches: are they environmentally driven?
Provedor de dados: 5
Autores: Ravier-mailly, Christelle; Fromentin, Jean-marc.
We tested whether synchronous long-term fluctuations in Atlantic bluefin tuna (Thunnus thynnus) trap catches, collected from the ancestral Mediterranean and Atlantic trap fishery, might be related to environmental changes in NAO and/or in temperature. Spectral analyses of trap catches and temperature displayed similar spectra with peak at low frequency whereas those of the NAO exhibited a broad band spectrum. Regression analyses and tests of correlation did not reveal any clear relationship between trap catches and NAO. In contrast, long-term fluctuations in trap catches appear to be negatively and significantly related to long-term trends in temperature. Underlying processes that could explain such a relationship are discussed, with special focus on...
Tipo: Text
Palavras-chave: Thunnus thynnus; NAO; Temperature; Trap fishery; Migration.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/00194/30530/28940.pdf

Temperature and photoperiod drive Crassostrea gigas reproductive internal clock
Provedor de dados: 5
Autores: Fabioux, Caroline; Huvet, Arnaud; Le Souchu, Pierrick; Le Pennec, Marcel; Pouvreau, Stephane.
This study examined the gametogenic cycle of Crassostrea gigas in controlled conditions over one year, with a focus on the initiation of gametogenesis. This work analysed also the role of temperature and photoperiod in the regulation of oyster reproduction. Broodstock were maintained in natural (NC), accelerated (AC) and perpetual winter (WC) conditions of temperature and photoperiod, with feeding ad libitum. Qualitative and quantitative analyses of the reproductive pattern were performed using biometric measurement approach, sex ratio determination, histology and a gonad filling index. Each experimental treatment led to different strategies for growth and resource allocation. The gametogenic cycle, appeared entirely modulated, accelerated or delayed, by...
Tipo: Text
Palavras-chave: Temperature; Regulation; Gonad filling index; Gonial mitosis; Reproduction; Oyster.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-826.pdf

Moisture sorption in polyamide 6.6: experimental investigation and comparison to four physical-based models
Provedor de dados: 5
Autores: Broudin, Morgane; Le Saux, V.; Le Gac, Pierre-yves; Champy, C.; Robert, G.; Charrier, P.; Marco, Y.
Water sorption in polyamide 6.6 has been characterized for a wide range of temperature (25°C to 80°C) and various water activities using a Dynamic Vapor Sorption testing machine. Complex sorption mechanisms govern the water uptake in the material. The competition between two main temperature dependant mechanisms has been observed: a Henry’s sorption mechanism that mainly governs the sorption curve at low water activities, and a second mechanism at high water activities that could be related to the formation of water clusters. It is observed that the temperature dependency can mainly be attributed to the Henry’s contribution. Four physically based models are then used and identified thanks to the extended experimental database. It is shown that a simple...
Tipo: Text
Palavras-chave: Polyamide 6.6; Water sorption; Temperature; Relative humidity; Physically-based models.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00252/36371/34911.pdf

On the Future of Argo: A Global, Full-Depth, Multi-Disciplinary Array
Provedor de dados: 5
Autores: Roemmich, Dean; Alford, Matthew H.; Claustre, Hervé; Johnson, Kenneth; King, Brian; Moum, James; Oke, Peter; Owens, W. Brechner; Pouliquen, Sylvie; Purkey, Sarah; Scanderbeg, Megan; Suga, Toshio; Wijffels, Susan; Zilberman, Nathalie; Bakker, Dorothee; Baringer, Molly; Belbeoch, Mathieu; Bittig, Henry C.; Boss, Emmanuel; Calil, Paulo; Carse, Fiona; Carval, Thierry; Chai, Fei; Conchubhair, Diarmuid Ó.; D’ortenzio, Fabrizio; Dall’olmo, Giorgio; Desbruyeres, Damien; Fennel, Katja; Fer, Ilker; Ferrari, Raffaele; Forget, Gael; Freeland, Howard; Fujiki, Tetsuichi; Gehlen, Marion; Greenan, Blair; Hallberg, Robert; Hibiya, Toshiyuki; Hosoda, Shigeki; Jayne, Steven; Jochum, Markus; Johnson, Gregory C.; Kang, Kiryong; Kolodziejczyk, Nicolas; Körtzinger, Arne; Traon, Pierre-yves Le; Lenn, Yueng-djern; Maze, Guillaume; Mork, Kjell Arne; Morris, Tamaryn; Nagai, Takeyoshi; Nash, Jonathan; Garabato, Alberto Naveira; Olsen, Are; Pattabhi, Rama Rao; Prakash, Satya; Riser, Stephen; Schmechtig, Catherine; Schmid, Claudia; Shroyer, Emily; Sterl, Andreas; Sutton, Philip; Talley, Lynne; Tanhua, Toste; Thierry, Virginie; Thomalla, Sandy; Toole, John; Troisi, Ariel; Trull, Thomas W.; Turton, Jon; Velez-belchi, Pedro Joaquin; Walczowski, Waldemar; Wang, Haili; Wanninkhof, Rik; Waterhouse, Amy F.; Waterman, Stephanie; Watson, Andrew; Wilson, Cara; Wong, Annie P. S.; Xu, Jianping; Yasuda, Ichiro.
The Argo Program has been implemented and sustained for almost two decades, as a global array of about 4000 profiling floats. Argo provides continuous observations of ocean temperature and salinity versus pressure, from the sea surface to 2000 dbar. The successful installation of the Argo array and its innovative data management system arose opportunistically from the combination of great scientific need and technological innovation. Through the data system, Argo provides fundamental physical observations with broad societally-valuable applications, built on the cost-efficient and robust technologies of autonomous profiling floats. Following recent advances in platform and sensor technologies, even greater opportunity exists now than 20 years ago to (i)...
Tipo: Text
Palavras-chave: Argo; Floats; Global; Ocean; Warming; Circulation; Temperature; Salinity.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00509/62043/66192.pdf

Les besoins écophysiologiques des larves d'huitres creuse Crassostrea gigas en conditions contrôlees : effet de la température, de la nourriture et modélisation de la croissance
Provedor de dados: 5
Autores: Rico Villa, Benjamin.
Nowadays, spat production of Pacific oyster Crassostrea gigas relies on rearing techniques under controlled conditions in hatchery. In this context, an extensive research in aquaculture is necessary because larval development and metamorphosis are critical for hatchery management. Firstly, a diet consisted in a Haptophyceae: Isochrysis affinis galbana (clone T-ISO) and a Bacillariophyceae: Chaetoceros calcitrans forma pumilum demonstrated its efficiency to supply the nutritional needs throughout the whole larval rearing. Then, a flow-through rearing system was developed and coupled with a continuous hydrobiological data recorder to provide basic information for ecophysiology research through different trophic levels and/or temperature throughout larval...
Tipo: Text
Palavras-chave: Crassostrea gigas; Larve; Huître; Croissance; Ecophysiologie; Microalgues; Température; Système d’élevage; Modélisation; Crassostrea gigas; Larvae; Oyster; Growth; Ecophysiology; Microalgae; Temperature; Rearing System; Modelling.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/00012/12308/9102.pdf

L'élevage larvaire intensif du loup Dicentrarchus labrax. Influence de la lumière, de la densité en proies et de la température sur l'aluminium, sur le transit digestif et sur les performances zootechniques
Provedor de dados: 5
Autores: Ronzani Cerqueira, Vinicius.
Several sea bass-rearing experiments were performed from hatching trough metamorphosis. The rearing units employed were 500 1 polyester tanks, where flow rate and temperature of seawater, light and suitable food (rotifer and artemia) were controlled. Stock density ranged between 50 and 100 larvae per liter.  Individuals held in tanks with internal black walls developed faster and had a greater survival rate than those in white tanks. This suggests that a better contrast between preys and background assists the larvae to see food organisms more clearly.  The sea bass larvae search for food is based only in vision and not trought mechanoreceptors or chemoreceptors. It was very difficult to evaluate the light intensity (50-5000 lux) influence on feeding,...
Tipo: Text
Palavras-chave: Food; Prey; Light; Zootechnical; Digestive transit; Temperature; Dicentrarchus labrax; Intensive rearing; Sea bass.
Ano: 1986
URL: http://archimer.ifremer.fr/doc/1986/these-1676.pdf

Shore-level size gradients and thermal refuge use in the predatory sea star Pisaster ochraceus: the role of environmental stressors
Provedor de dados: 5
Autores: Monaco, Cristian; Wethey, David S.; Gulledge, Shadow; Helmuth, Brian.
The body size of a mobile intertidal invertebrate can determine its access to different microhabitats, and thus alter its exposure to environmental stressors. We surveyed a rocky intertidal keystone predator, the sea star Pisaster ochraceus, and characterized size-dependent distribution, defined by individuals' shore level and refuge use. At 2 field sites (in California and Oregon, USA) we examined temporal and geographical variability in habitat selection. We evaluated the hypothesis that environmental drivers measured on-site and body temperatures measured using biomimetic sensors (i.e. 'robo-sea stars'), explained the observed distribution patterns, including shore-level size gradients, with larger animals lower on the shore. We tested the effect of...
Tipo: Text
Palavras-chave: Ecology; Physiology; Rocky intertidal; Environmental stress; Climate change; Temperature; Desiccation; Solar radiation; Body size; Behavior.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00605/71695/70137.pdf

Growth and gonad development of the tropical black-lip pearl oyster, Pinctada margaritifera (L.), in the Gambier archipelago (French Polynesia)
Provedor de dados: 5
Autores: Le Moullac, Gilles; Tiapari, Jerome; Teissier, Hinano; Martinez, Elodie; Cochard, Jean-claude.
The growth and reproductive cycle of cultured black-lipped pearl oysters, Pinctada margaritifera (L.), were studied in the Gambier Islands (134°52' W, 23°07' S) from September 2002 to August 2003. Temperatures were recorded throughout the year, revealing seasonal temperature variations between 22.3 °C and 27.8 °C. The mean annual chlorophyll a value, as computed from satellite data, was 0.188 ± 0.075 µg L-1. To study growth and reproduction, 720 two-year-old individuals were ear hung on longlines suspended at a depth of 7 m. Samples were taken twice a month to obtain the following measurements: shell height; wet weight of flesh and total oyster; dry weight of adductor muscle, mantle and visceral mass; and glycogen content. Gonad development was also...
Tipo: Text
Palavras-chave: Pearl oyster; Pinctada margaritifera; Growth; Reproduction; Temperature; Chlorophyll; Seasonality; Gambier archipelago.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00040/15099/13570.pdf

Interannual variability of zooplankton in the Dumont d'Urville sea (139 degrees E-146 degrees E), east Antarctica, 2004-2008
Provedor de dados: 5
Autores: Swadling, Kerrie M.; Penot, Florian; Vallet, Carole; Rouyer, Armelle; Gasparini, Stephane; Mousseau, Laure; Smith, Martina; Goffart, Anne; Koubbi, Philippe.
Spatial and temporal variability of zooplankton was studied during five summers (2004-2008) in the Dumont d'Urville Sea, east Antarctica. The species recorded, based on the catch of a 500 mm-mesh Bongo net, were typical of southern continental shelf communities in Antarctica, including Euphausia crystallorophias, polychaetes, pteropods and biomass-dominant copepods. There was a strong degree of temporal variation in abundance, possibly related to the thickness and extent of the sea ice cover during each spring prior to the surveys. Total mean abundance was highly variable between years, with a minimum of 961 ind. 1000m(-3) in 2004 (range 65-3407 ind. 1000 m(-3)) and a maximum of 15,627 ind. 1000 m(-3) in 2005 (range 5109-33,869 ind. 1000 m(-3)). Spatially,...
Tipo: Text
Palavras-chave: Salinity; Temperature; Sea ice; Zooplankton-environment relationships; Mertz glacier.
Ano: 2011
URL: https://archimer.ifremer.fr/doc/00230/34123/32600.pdf

Decoupling light harvesting, electron transport and carbon fixation during prolonged darkness supports rapid recovery upon re-illumination in the Arctic diatom Chaetoceros neogracilis
Provedor de dados: 5
Autores: Lacour, Thomas; Morin, Philippe-israël; Sciandra, Théo; Donaher, Natalie; Campbell, Douglas A.; Ferland, Joannie; Babin, Marcel.
During winter in the Arctic marine ecosystem, diatoms have to survive long periods of darkness caused by low sun elevations and the presence of sea ice covered by snow. To better understand how diatoms survive in the dark, we subjected cultures of the Arctic diatom Chaetoceros neogracilis to a prolonged period of darkness (1 month) and to light resupply. Chaetoceros neogracilis was not able to grow in the dark but cell biovolume remained constant after 1 month in darkness. Rapid resumption of photosynthesis and growth recovery was also found when the cells were transferred back to light at four different light levels ranging from 5 to 154 µmol photon m−2 s−1. This demonstrates the remarkable ability of this species to re-initiate growth over a wide range...
Tipo: Text
Palavras-chave: Arctic microalgae; Polar night; Diatom; Darkness; Photosynthesis; Growth rate; Temperature.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00499/61066/64597.pdf

Influence of early thermic and photoperiodic control on growth and smoltification in Atlantic salmon (Salmo salar)
Provedor de dados: 5
Autores: Gaignon, Jean-louis; Quemener, Loic.
Atlantic salmon juveniles were subjected to a precocious (day 104 after first feeding) photoperiodic (P) and thermic (T) control. After rearing the fry at 16 degrees C, constant (16 hours of light and 8 hours of darkness, 16 degrees C) (C) and shortened simulated natural S photoperiod and temperature regimes were used in a factorial experimental design until transfer to seawater. The growth obtained with constant (C) regimes was better than with S regimes. In all cases, we observed very early (day 141, mid-June) a clear segregation of the population into two different subpopulations. Among the conditions, all the differences between the upper and lower modes were growth-dependent. We observed different developmental trends of the gill (Na+-K+)-ATPase...
Tipo: Text
Palavras-chave: Photopériode; Température; Smolts 0+; Saumon atlantique; Photoperiod; Temperature; 0(+) smolts; Atlantic salmon.
Ano: 1992
URL: http://archimer.ifremer.fr/doc/00190/30159/28746.pdf

Temperature Measurements from Surface Drifters
Provedor de dados: 5
Autores: Reverdin, G.; Boutin, J.; Martin, N.; Lourenco, A.; Bouruet-aubertot, P.; Lavin, A.; Mader, J.; Blouch, P.; Rolland,; Gaillard, Fabienne; Lazure, Pascal.
The accuracy of temperature measurements from drifters is first examined for 16 drifters (manufactured either by Metocean Data Systems or by Pacific Gyre) deployed with two temperature sensors in the tropical or North Atlantic Ocean. One of these sensors is the SST thermistor commonly used on Surface Velocity Program (SVP) drifters since the late 1980s; whereas the other sensor is a platinum temperature probe associated with a Seabird conductivity cell. The authors find (for 19 separate deployments) an average positive offset of the SST thermistor measurements in 17 out of 19 cases, exceeding 0.1 degrees C in five instances. Among the five drifters that were at sea for a year or more, two present a large trend in this offset (0.10 degrees and -0.10 degrees...
Tipo: Text
Palavras-chave: Temperature; Sea surface temperature; Instrumentation; Sensors.
Ano: 2010
URL: https://archimer.ifremer.fr/doc/00012/12327/9112.pdf

Fluctuations à long terme du thon rouge: validité, origines et conséquences
Provedor de dados: 5
Autores: Ravier, Christelle.
Describe and gain understanding on fluctuations in animal population over time and space is a central goal of population ecology. This is also crucial to ensure the sustainable management of exploited resources, particularly those with complex population dynamics such as the bluefin tuna. The goal of this work is to collect bluefin tuna catches from the ancestral Mediterranean and Atlantic trap fisheries to (i) characterise long-term fluctuations in bluefin tuna population migrating in the Mediterranean, (ii) analyse their causes et (iii) assess their implications for fisheries management.  The bluefin tuna main biological and ecological characteristics are first detailed. Then, the first part presents the trap fishery, and the process of collect and...
Tipo: Text
Palavras-chave: Biological reference point; V.p.a.; Management; Migration; N.a.o.; Temperature; Tunas/environment relationships; Population dynamics; Periodic fluctuations; Long term trend; Time series; East Atlantic; Mediterranean Sea; Trap fishery; Thunnus thynnus; Points biologiques de référence; V.p.a.; Modèle global; Migration; N.a.o.; Température; Relation thon/environnement; Dynamique de population; Fluctuations périodiques; Tendances à long terme; Séries temporelles; Atlantique Est; Méditerranée; Madrague; Thunnus thynnus.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/2003/these-65.pdf

Organic Carbon Export and Loss Rates in the Red Sea
Provedor de dados: 5
Autores: Kheireddine, Malika; Dall'Olmo, Giorgio; Ouhssain, Mustapha; Krokos, George; Claustre, Hervé; Schmechtig, Catherine; Poteau, Antoine; Zhan, Peng; Hoteit, Ibrahim; Jones, Burton H.
The export and fate of organic carbon in the mesopelagic zone are still poorly understood and quantified due to lack of observations. We exploited data from a biogeochemical‐Argo float that was deployed in the Red Sea to study how a warm and hypoxic environment can affect the fate of the organic carbon in the ocean's interior. We observed that only 10% of the particulate organic carbon (POC) exported survived at depth due to remineralization processes in the upper mesopelagic zone. We also found that POC exported was rapidly degraded in a first stage and slowly in a second one, which may be dependent on the palatability of the organic matter. We observed that apparent oxygen utilization (AOU)‐based loss rates (a proxy of the remineralization of total...
Tipo: Text
Palavras-chave: Carbon export; Carbon loss rates; Mesopelagic zone; Temperature; Oxygen; Tropical ecosystem.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00655/76730/77877.pdf

Natural factors to consider when using acetylcholinesterase activity as neurotoxicity biomarker in Young-Of-Year striped bass (Morone saxatilis)
Provedor de dados: 5
Autores: Durieux, Eric; Farver, Thomas B.; Fitzgerald, Patrick S.; Eder, Kai J.; Ostrach, David J.
Acetylcholinesterase (AChE) activity is one of the most common biomarkers of neurotoxicity used in aquatic organisms. However, compared to its extensive use as biomarker, the effects of natural factors onAChE activity remain unclear especially in estuarine fishes. The aim of this study was to evaluate the effects of natural factors on AChE activity of striped bass (Morone saxatilis) juveniles. Brain AChE activity was measured in YOY (Young-Of-Year) individuals collected monthly from August 2007 to January 2008 at 12 different sites in the San Francisco Estuary system. The spatio-temporal variability of AChE was analyzed relative to water temperature and salinity as well as fish size. AChE activity was highly positively correlated with water temperature and...
Tipo: Text
Palavras-chave: Fish; Biomarker; Acetylcholinesterase; Brain; Temperature; Salinity; Size.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00008/11939/8642.pdf

Global expressions for seasonal temperatures of the sea surface and ambient air - The influence of tidal currents and water depth
Provedor de dados: 5
Autores: Prandle, D.
A 'single point' coupled ocean-atmosphere model is formulated to study seasonal temperature cycles with particular application to shelf seas. The simplified atmospheric module is consistent with the physical processes described by Gill [4] while the vertical exchange of heat in the ocean module is determined via a turbulence closure model. The various empirical coefficients in the atmospheric module were determined by fitting the model output to North Atlantic observational data over the latitude range 0 degrees to 65 degrees N. The model is then applied to the shallow, strongly tidal North Sea. The general validity of the model is demonstrated, thereby indicating that the seasonal cycles of the sea surface, T-s, and ambient air, T-a, are generally...
Tipo: Text
Palavras-chave: Température; Cycle annuel; Couplage océan-atmosphère; Mer bordière; Mer du Nord; Temperature; Annual cycle; Atmosphere-ocean coupling; Shelf seas; North Sea.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00325/43665/43205.pdf

Modeling the impact of hypoxia on the energy budget of Atlantic cod in two populations of the Gulf of Saint-Lawrence, Canada
Provedor de dados: 5
Autores: Lavaud, Romain; Thomas, Yoann; Pecquerie, Laure; Benoit, Hugues P.; Guyondet, Thomas; Flye-sainte-marie, Jonathan; Chabot, Denis.
Like many marine species around the globe, several stocks of Atlantic cod (Gadus morhua) live in increasingly hypoxic waters. In the Gulf of Saint Lawrence (GSL) in Canada, the deep channels traversing the semi-enclosed sea exhibit year-round hypoxia, identified as one of the limiting factor for the recovery of GSL cod in its northern part. While many individuals in the northern GSL are known to venture in deeper, warmer, and more hypoxic waters of the Gulf channels, those in the southern GSL live in a shallower, colder, and more oxygenated environment. In this study, we use the modeling framework of the Dynamic Energy Budget (DEB) theory to disentangle the effects of hypoxia, temperature and food on the life-history traits of these two populations of cod...
Tipo: Text
Palavras-chave: Hypoxia; Dynamic energy budget; Atlantic cod; Growth; Temperature; Gulf of Saint-Lawrence.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00448/55966/57472.pdf

Toxin and Growth Responses of the Neurotoxic Dinoflagellate Vulcanodinium rugosum to Varying Temperature and Salinity
Provedor de dados: 5
Autores: Abadie, Eric; Muguet, Alexia; Berteaux, Tom; Chomerat, Nicolas; Hess, Philipp; Roque D'Orbcastel, Emmanuelle; Masseret, Estelle; Laabir, Mohamed.
Vulcanodinium rugosum, a recently described species, produces pinnatoxins. The IFR-VRU-01 strain, isolated from a French Mediterranean lagoon in 2010 and identified as the causative dinoflagellate contaminating mussels in the Ingril Lagoon (French Mediterranean) with pinnatoxin-G, was grown in an enriched natural seawater medium. We tested the effect of temperature and salinity on growth, pinnatoxin-G production and chlorophyll a levels of this dinoflagellate. These factors were tested in combinations of five temperatures (15, 20, 25, 30 and 35 °C) and five salinities (20, 25, 30, 35 and 40) at an irradiance of 100 µmol photon m−2 s−1. V. rugosum can grow at temperatures and salinities ranging from 20 °C to 30 °C and 20 to 40, respectively. The optimal...
Tipo: Text
Palavras-chave: Vulcanodinium rugosum; Mediterranean Ingril Lagoon; Toxin production; Growth conditions; Temperature; Salinity.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00333/44429/44095.pdf

Flow cytometry to measure impact of temperature and salinity on the survival of Bonamia ostreae, parasite infecting flat oyster Ostrea edulis, in seawater
Provedor de dados: 5
Autores: Arzul, Isabelle; Bond, Celine; Gagnaire, Beatrice; Morga, Benjamin; Chollet, Bruno; Ferrand, Sylvie; Robert, Maeva; Renault, Tristan.
Bonamiosis due to the intrahaemocytic protistan parasite Bonamia ostreae is a European endemic disease affecting the flat oyster, Ostrea edulis. After its first description in June 1979&amp;#305; in Brittany, the parasite rapidly spread to all French oyster farming areas and in other European countries through transfers of live molluscs. The parasite has been described in different ecosystems from estuaries to open sea and no clear correlations could he demonstrated between the disease development and environmental parameters like temperature or salinity. The infection can he directly transmitted by cohabitation between infected and non infected oysters. Nevertheless, the parasite life cycle, including its survival outside the host, is not completely...
Tipo: Text
Palavras-chave: Impact; Salinity; Temperature; Flow cytometry; Bonamia ostreae; Parasite; Ostrea edulis; Oyster.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/acte-3372.pdf

Evidence for northward expansion of Antarctic Bottom Water mass in the Southern Ocean during the last glacial inception
Provedor de dados: 5
Autores: Govin, Aline; Michel, Elisabeth; Labeyrie, Laurent; Waelbroeck, Claire; Dewilde, Fabien; Jansen, Eystein.
We investigated deep water changes in the Southern Ocean during the last glacial inception, in relationship to surface hydrology and global climatology, to better understand the mechanisms of the establishment of a glacial ocean circulation. Changes in benthic foraminiferal delta(13)C from three high-resolution cores are compared and indicate decoupled intermediate and deep water changes in the Southern Ocean. From the comparison with records from the North Atlantic, South Atlantic, and the Southern Ocean, we show that the early southern deep water delta(13)C drop observed at the MIS 5.5-5.4 transition occurred before any significant reduction of North Atlantic Deep Water ventilation. We propose that this drop is linked to the northward expansion of poorly...
Tipo: Text
Palavras-chave: Isotope substage 5E; Ice core; Interglacial period; Climate variability; Deep ocean; Atlantic; Sea; Circulation; Temperature; Hemisphere.
Ano: 2009
URL: https://archimer.ifremer.fr/doc/00208/31952/30375.pdf

Traitement à haute température des huîtres infectées par l’ostreid herpesvirus 1 (OsHV-1). TEMPO - Rapport 2016
Provedor de dados: 5
Autores: Pernet, Fabrice.
Le naissain d’huître creuse Crassostrea gigas est touché chaque année depuis 2008 par des mortalités causées par un microvariant de l’ostreid herpesvirus 1 (OsHV-1 μVar). Plusieurs études montrent que ces évènements de mortalité se produisent préférentiellement lorsque la température de l’eau est comprise entre 16°C et 24°C. Par conséquent, une exposition rapide des huîtres infectées par OsHV-1 à des températures supérieures à 24°C pourrait limiter les mortalités causées par le virus. Il est proposé de (1) vérifier l’hypothèse selon laquelle l’exposition à haute température réduit la mortalité des huîtres infectées par OsHV-1, et (2) déterminer si les animaux qui ont survécu suite à l’infection par OsHV-1 et au traitement thermique sont...
Tipo: Text
Palavras-chave: Epidémiologie; Huître; OsHV-1; Risque; Survie; Température; Epidemiology; Oysters; OsHV-1; Risk; Survival; Temperature.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00434/54574/55953.pdf

Modelling the influence of environmental factors on the physiological status of the Pacific oyster Crassostrea gigas in an estuarine embayment; The Baie des Veys (France)
Provedor de dados: 5
Autores: Grangere, Karine; Menesguen, Alain; Lefebvre, Sébastien; Bacher, Cedric; Pouvreau, Stephane.
It is well known that temporal changes in bivalve body mass are strongly correlated with temporal variations in water temperature and food supply. In order to study the influence of the year-to-year variability of environmental factors on oyster growth, we coupled a biogeochemical sub-model, which simulates trophic resources of oysters (i.e. phytoplankton biomass via chlorophyll a), and an ecophysiological sub-model, which simulates growth and reproduction (i.e. gametogenesis and spawning), using mechanistic bases. The biogeochemical sub-model successfully simulated phytoplankton dynamics using river nutrient inputs and meteorological factors as forcing functions. Adequate simulation of oyster growth dynamics requires a relevant food quantifier compatible...
Tipo: Text
Palavras-chave: Baie des Veys; Normandy; France; Physiological Status; Phytoplankton Carbon Concentration; Food Supply; Temperature; Dynamic Energy Budget model; Biogeochemical Model.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6809.pdf

Influence of ambient oxygenation and temperature on metabolic scope and scope for heart rate in the common sole Solea solea
Provedor de dados: 5
Autores: Lefrancois, Christelle; Claireaux, Guy.
The objective of this study was to quantify the constraints exerted by temperature and oxygenation on both metabolic scope and scope for heart rate of the common sole Solea solea. We exposed sole to a large range of temperature and oxygenation conditions and a modelling procedure was implemented to describe metabolic and cardiac responses. Standard metabolic rate (SMR) rose exponentially from 4 to 24degreesC, whereas active metabolic rate (AMR) increased from 55.4 to 159.2 mgO(2) kg(-1) h(-1) between 4 and 19.7degreesC, and then dropped to 129.9 mgO(2) kg(-1) h(-1) at 24degreesC. In parallel, optimal temperature for maximising metabolic scope, defined as the difference between AMR and SMR, was estimated to 18.8degreesC. Active heart rates increased...
Tipo: Text
Palavras-chave: Metabolic scope; Heart rate; Biological performance; Temperature; Oxygen; Common sole.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/00000/10690/7594.pdf

Full-depth temperature trends in the northeastern Atlantic through the early 21st century
Provedor de dados: 5
Autores: Desbruyeres, D.g.; Mcdonagh, E. L.; King, B. A.; Garry, F. K.; Blaker, A. T.; Moat, B. I.; Mercier, Herle.
The vertical structure of temperature trends in the northeastern Atlantic (NEA) is investigated using a blend of Argo and hydrography data. The representativeness of sparse hydrography sampling in the basin mean is assessed using a numerical model. Between 2003 and 2013, the NEA underwent a strong surface cooling (0–450 m) and a significant warming at intermediate and deep levels (1000 m to 3000 m) that followed a strong cooling trend observed between 1988 and 2003. During 2003–2013, gyre-specific changes are found in the upper 1000 m (warming and cooling of the subtropical and subpolar gyres, respectively), while the intermediate and deep warming primarily occurred in the subpolar gyre, with important contributions from isopycnal heave and water mass...
Tipo: Text
Palavras-chave: North Atlantic; Temperature; Observations; Hiatus.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00236/34677/33026.pdf

THE AEROCLIPPER A New Device to Explore Convective Systems and Cyclones
Provedor de dados: 5
Autores: Duvel, J. P.; Basdevant, C.; Bellenger, H.; Reverdin, Gilles; Vargas, A.; Vialard, Jerome.
Aeroclipper balloons, designed for taking measurements at the air-sea interface, can withstand extreme conditions encountered when they are drawn into tropical cyclones and then follow the eye trajectory.
Tipo: Text
Palavras-chave: Atmospheric research; Boundary layer; Surface fluxes; Arabian sea; Parameterization; Balloons; Ocean; Temperature; Enhancement; Evaporation.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/00185/29635/27989.pdf

Assessing the long-term effect of exposure to dispersant-treated oil on fish health using hypoxia tolerance and temperature susceptibility as ecologically relevant biomarkers
Provedor de dados: 5
Autores: Mauduit, Florian; Farrell, Anthony P.; Domenici, Paolo; Lacroix, Camille; Le Floch, Stephane; Lemaire, Pphilippe; Nicolas-kopec, Annabelle; Whittington, Mark; Le Bayon, Nicolas; Zambonino-infante, Jose-luis; Claireaux, Guy.
Consequences of exposure to polyaromatic hydrocarbons (PAH), toxic components of crude oil, on fish has been widely documented due to their ecological and economical importance. However, although forming a valuable and consistent body of knowledge, use of these data in spill response is limited. Objective of the present study was thus to facilitate the translation of published data into information of operational value. For this, we investigated the dose‐response relationship between dispersant‐treated oil exposure and ecologically‐relevant consequences by combining laboratory and field experiments. Effects were examined over almost a year using juveniles of the slow growing, commercially important European sea bass (Dicentrarchus labrax). Moreover, a...
Tipo: Text
Palavras-chave: Oil spills; Polycyclic aromatic hydrocarbons (PAHs); Fish indices; Hypoxia; Temperature.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00455/56679/58438.pdf

The role of hydrographic parameters, measured from a ship of opportunity, in bloom formation of Karenia mikimotoi in the English Channel
Provedor de dados: 5
Autores: Hartman, S.e.; Hartman, M. C.; Hydes, D.j.; Smythe-wright, D.; Gohin, Francis; Lazure, Pascal.
Unusually high chlorophyll values (~ 14 mg chl m− 3 at 5 m depth), recorded on a ship of opportunity (SOO) in July 2010, indicated the occurrence of a potential Harmful Algal Bloom (HAB) in the Western approaches of the English Channel. This bloom, located at 49.7°N, 3.2°W was observed via complementary datasets. These included data from samples collected for microscopic phytoplankton identification, information from satellite maps to follow geographical bloom development and in situ data to identify hydrographic factors related to bloom initiation. The relationships between chlorophyll-fluorescence, temperature, salinity and wind speed were examined. The intense summer bloom predominantly consisted of the dinoflagellate Karenia mikimotoi and followed an...
Tipo: Text
Palavras-chave: Karenia mikimotoi; Harmful algae; Wind speed; Temperature; Low salinity water; French Atlantic rivers; English Channel; Ferry-box.
Ano: 2014
URL: https://archimer.ifremer.fr/doc/00199/31033/29437.pdf

Storage of Pacific oysters Crassostrea gigas in recirculating tank: ammonia excretion and potential nitrification rates
Provedor de dados: 5
Autores: Buzin, Florence; Dupuy, Beatrice; Lefebvre, Sebastien; Barille, Laurent; Haure, Joel.
In response to the closure of shellfish production sites due to increasing occurrence of toxic algal blooms, land-based recirculating aquaculture systems (RAS) could be used by producers to store a proportion of their stock temporarily. An RAS prototype was tested in this study to store Pacific oyster Crassostrea gigas over a range of temperatures. In such systems, the water temperature is a variable that could influence the bivalve excretion rate of ammonia, the concentration of which may become critical for the water quality. In this study, we first estimated the total ammonia nitrogen (TAN, N-NH4+ + N-NH3) excretion of the Pacific oyster and then investigated whether the bacterial population associated with the oysters could act as a natural biofilter...
Tipo: Text
Palavras-chave: Crassostrea gigas; Ammonia excretion; Nitrification rate; Recirculating system; Temperature.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00248/35889/34409.pdf

Ocean warming combined with lower omega-3 nutritional availability impairs the cardio-respiratory function of a marine fish
Provedor de dados: 5
Autores: Vagner, Marie; Pante, Eric; Viricel, Amelia; Lacoue-labarthe, Thomas; Zambonino-infante, Jose-luis; Quazuguel, Patrick; Dubillot, Emmanuel; Huet, Valerie; Le Delliou, Herve; Lefrançois, Christel; Imbert-auvray, Nathalie.
Highly unsaturated fatty acids of the omega-3 series (HUFA) are major constituents of cell membranes, yet poorly synthesised de novo by consumers. Their production, mainly supported by aquatic microalgae, has been decreasing with global change. Understanding the consequences of such reductions is essential for ectotherm consumers, since temperature tightly regulates the HUFA content in cell membranes, maintaining their functionality. Integrating individual, tissue and molecular approaches, we examined the consequences of the combined effects of temperature and HUFA depletion on the key cardio-respiratory functions of the golden grey mullet, an ectotherm grazer of high ecological importance. For four months, fish were exposed to two contrasting HUFA diets...
Tipo: Text
Palavras-chave: Omega-3 highly unsaturated fatty acids; Temperature; Cardiac performance; Swimming performance; Chelon auratus; RNAseq.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00476/58744/63565.pdf

Effect of exposure to petroleum hydrocarbons upon cardio-respiratory function in the common sole (Solea solea)
Provedor de dados: 5
Autores: Claireaux, Guy; Davoodi, Fariba.
The long term consequences of oil exposure upon marine populations are still poorly evaluated. One particular missing piece of information relates to the link between oil exposure, individuals' ability to face environmental contingencies and populations' production and dynamics. In that context, the present paper investigates the impact of oil exposure upon fish cardio-respiratory performance, this performance being viewed as a key determinant of individual fitness. Experimental conditions replicated the contamination conditions observed during the weeks that immediately followed the Erika oil spill (west coast of France; December 1999). Sole (Solea solea), were exposed to number-2 oil for 5 days and were then challenged with an acute rise in temperature...
Tipo: Text
Palavras-chave: Petroleum hydrocarbons; Temperature; Oxygen consumption; Cardiac performance; Environmental adaptation; Solea solea.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00006/11765/9272.pdf

Caracteristiques topographiques et thermiques d'un site de ponte majeur de la tortue verte Chelonia mydas dans l'Ocean Indien sud-ouest: Europa
Provedor de dados: 5
Autores: Le Gall, Jean-yves; Taquet, Marc; Cluet, Denis; Biais, Gerard.
The beach of the meteorological station of Europa Island (Indian Ocean S.W.) is a major nesting site for the green turtle. Altimetric distribution of nests on the beach is such than 95 % of nests are laid in the band located between 1.25 and 3 m above the mean level of upper tides. Nest density is a function of adult females number and varies from 0.175 to 0.043 nest/m2 for the two analyzed nesting seasons. Ground temperatures at 60 cm and 100 cm depth range from 22 (winter) to, 30°C (summer). Interannual variability of ground temperature at same depth (incubation depth) is 1.5° C from extreme hot to cold years. These intra and interannual variations are supposed to have an effect upon the sex-ratio of hatchlings
Tipo: Text
Palavras-chave: Tortue verte; Chelonia mydas; Ponte; Distribution; Température; Incubation; Green turtle; Chelonia mydas; Nest; Distribution; Temperature; Incubation.
Ano: 1988
URL: http://archimer.ifremer.fr/doc/00113/22407/20104.pdf

Moderate hypoxia but not warming conditions at larval stage induces adverse carry-over effects on hypoxia tolerance of European sea bass ( Dicentrarchus labrax ) juveniles
Provedor de dados: 5
Autores: Cadiz, Laura; Ernande, Bruno; Quazuguel, Patrick; Servili, Arianna; Zambonino-infante, Jose-luis; Mazurais, David.
Environmental conditions, to which organisms are exposed during all their life, may cause possible adaptive responses with consequences in their subsequent life-history trajectory. The objective of this study was to investigate whether ecologically relevant combinations of hypoxia (40% and 100% air saturation) and temperature (15° and 20 °C), occurring during the larval period of European sea bass larvae (Dicentrarchus labrax), could have long-lasting impacts on the physiology of resulting juveniles. Hypoxic challenge tests were performed over one year to give an integrative evaluation of physiological performance. We revealed that juvenile performance was negatively impacted by hypoxia but not by the thermal conditions experienced at larval stage. This...
Tipo: Text
Palavras-chave: Hypoxia; Temperature; Developmental plasticity; Carry-over effects; Opercular malformation; European sea bass.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00434/54606/55988.pdf

Toxic factors of Vibrio strains pathogenic to shrimp
Provedor de dados: 5
Autores: Goarant, Cyrille; Herlin, Jose; Brizard, Raphael; Marteau, Anne-laure; Martin, C; Martin, B.
Vibriosis is a major disease problem in shrimp aquaculture. 'Syndrome 93' is a seasonal juvenile vibriosis caused by Vibrio penaeicida which affects Litopenaeus stylirostris in grow-out ponds in New Caledonia. This study assessed the toxic activities of extracellular products (ECPs) from V: penaeicida, V. alginolyticus and V, nigripulchritudo using in vivo injections in healthy juvenile L. stylirostris (= Penaeus stylirostris) and in vitro assays on shrimp primary cell cultures and the fish cell line epithelioma papulosum cyprini (EPC). Toxic effects of ECPs were demonstrated for all pathogenic Vibrio strains tested both in vivo and in vitro, but for shrimp only; no effect was observed on the fish cell line. ECP toxicity for New Caledonian V. penaeicida...
Tipo: Text
Palavras-chave: Vibrio; Vibrio penaeicida; Shrimp; Extracellular products; Temperature.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/00000/10543/7600.pdf

Climate change impacts on fish reproduction are mediated at multiple levels of the brain-pituitary-gonad axis
Provedor de dados: 5
Autores: Servili, Arianna; Canario, Adelino V.m.; Mouchel, Olivier; Muñoz-cueto, José Antonio.
Anthropogenic emissions of carbon dioxide in the atmosphere have generated rapid variations in atmospheric composition which drives major climate changes. Climate change related effects include changes in physico-chemical proprieties of sea and freshwater, such as variations in water temperature, salinity, pH/PCO2 and oxygen content, which can impact fish critical physiological functions including reproduction. In this context, the main aim of the present review is to discuss how climate change related effects (variation in water temperature and salinity, increases in duration and frequency of hypoxia events, water acidification) would impact reproduction by affecting the neuroendocrine axis (brain-pituitary-gonad axis). Variations in temperature and...
Tipo: Text
Palavras-chave: Climate change; Fish reproduction; Gonads; Neuroendocrine regulation; Environmental control; Temperature.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00609/72079/70796.pdf

Deep temperature variability in Drake Passage
Provedor de dados: 5
Autores: Firing, Yvonne L.; Mcdonagh, Elaine L.; King, Brian A.; Desbruyeres, Damien.
Observations made on 21 occupations between 1993 and 2016 of GO-SHIP line SR1b in eastern Drake Passage show an average temperature of 0.53 degrees C deeper than 2000 dbar, with no significant trend, but substantial year-to-year variability (standard deviation 0.08 degrees C). Using a neutral density framework to decompose the temperature variability into isopycnal displacement (heave) and isopycnal property change components shows that approximately 95% of the year-to-year variance in deep temperature is due to heave. Changes on isopycnals make a small contribution to year-to-year variability but contribute a significant trend of -1.40.6 m degrees C per year, largest for density ((n))&gt;28.1, south of the Polar Front (PF). The heave component is...
Tipo: Text
Palavras-chave: Temperature; Trends; Southern Ocean.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00387/49812/50390.pdf

Persistent establishment of a tropical disease in Europe: the preadaptation of schistosomes to overwinter
Provedor de dados: 5
Autores: Mulero, Stephen; Rey, Olivier; Arancibia, Nathalie; Mas-coma, Santiago; Boissier, Jerome.
BackgroundGlobal changes promote the spread of infectious diseases worldwide. In this context, tropical urogenital schistosomiasis is now permanently established in Corsica since its first emergence in 2013. The local persistence of the tropical pathogens (schistosomes) responsible for urogenital schistosomiasis at such latitudes might be explained by (i) the presence of its intermediate host, the snail Bulinus truncatus, (ii) the recurrent local reseeding of schistosomes by their vertebrate hosts (either human or animal) every summer, and/or (iii) the maintenance and survival of schistosomes within their snail hosts over winter.MethodsIn this study we conducted an ecological experiment to assess the ability of temperate and tropical schistosome strains to...
Tipo: Text
Palavras-chave: Schistosomiasis; Bulinus truncatus; Corsica; Persistence; Schistosoma haematobium; Temperature.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00509/62088/66275.pdf

La Reproduction naturelle et contrôlée des bivalves cultivés en France. -Rapport de Groupe de Travail- IFREMER/Nantes/France, 14 et 15 novembre 1995
Provedor de dados: 5
Autores: Devauchelle, Nicole; Barret, Jean; Salaun, Gilles.
This report compiles 17 short and illustrated syntheses concerning the natural strategies of reproduction and the artificial control of the reproductive process for the flat oyster, Ostrea edulis, the japanese oyster, Crassostrea gigas, the mussels, Mytilus edulis and My ti/us galloprovincialis, the scallop, Pecten maximus. An additional syntheses is presented, as a comparison within molluscs, which are the main research topics at IFREMER concerning the artificial control of the reproductive processes in Marine Fish. Three main subjects are documented :  1. the ecophysiology of the natural period of reproduction in the wild,  2. the methods developed in the hatcheries for the artificial control of the reproductive periods, the gametes collection and the...
Tipo: Text
Palavras-chave: Bivalves; Stratégie de reproduction; Contrôle artificiel; Gonades; Gamètes; Coquille St Jacques; Moules; Huîtres; Nourriture; Photopériode; Température; Biologie; Physiologie; Biochimie.; Bivalves; Reproductive strategy; Artificial induction of reproduction; Gonads; Gametes; Scallop; Mussels; Oysters; Food; Light; Temperature; Biology; Physiology; Biochemistry.
Ano: 1997
URL: http://archimer.ifremer.fr/doc/00043/15441/12811.pdf

La reproduction de l'Ormeau Haliotis tuberculata L.
Provedor de dados: 5
Autores: Girard, Annie.
In order to improve the regulation of abalone 'fishing' and to provide for the restocking of supplies, more details of the reproductive cycle were sought. Attention is given to gonad morphology, acquisition of sexual maturity, juvenile hermaphroditism, gonad histogenesis and histology of gametogenesis, annual cycle of gamete emission, and the relation between size and fertility. Results are presented in graphs, histograms, diagrams and photographs. It was found that female reached sexual maturity during the 3rd year, at 38-54 mm, male during year 2 at 25-40 mm; there was successive juvenile hermaphroditism; an active period from mid-June to mid-November was indicated by the volumentric index of maturity; water temperature was associated with the...
Tipo: Text
Palavras-chave: Ormeau; Cycle; Temperature; Haliotis tuberculata L.; Reproduction.
Ano: 1972
URL: http://archimer.ifremer.fr/doc/1972/publication-2062.pdf

Chemical and thermal description of the environment of the Genesis hydrothermal vent community (13 degrees N, EPR)
Provedor de dados: 5
Autores: Sarradin, Pierre-marie; Caprais, Jean-claude; Briand, Patrick; Gaill, Françoise; Shillito, Bruce; Desbruyeres, Daniel.
The objective of this study is to describe the chemical and physical environment surrounding the vent organisms at the Genesis site (EPR, 2640 m). The main chimney is colonized by Riftia pachyptila, fishes Zoarcidae and crabs Bythograeidae. The top of the smoker is covered with tubes of polychaetes Alvinellidae, the frontier zone by limpet gastropods. Temperature measurements and water sampling were made on an axis along the chimney. The environment was characterized using relationships between chemical concentrations and temperature to provide a chemo-thermal model of the site. Discrete temperature ranges were 1-1.6 degrees C in sea water, 1.6-10 degrees C among Riftia plumes (up to 25 degrees C at the tube base), 7-91 degrees C close to the alvinellid...
Tipo: Text
Palavras-chave: Hydrothermal ecosystem; Hydrogen sulphide; Carbon dioxide; Temperature.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00186/29764/28200.pdf

Rôle de la température dans l'interaction huître creuse / Ostreid Herpesvirus de type 1 : réponses transcriptomiques et métaboliques
Provedor de dados: 5
Autores: Delisle, Lizenn.
Crassostrea gigas is the main species of oyster cultivated in the world. Since 2008, mass mortality events have been affecting oysters aged less than one year old in Europe and Oceania and have been associated with the emergence of the Ostreid herpes virus μVar (OsHV-1 μVar). In Europe, these events are seasonal and occur when the seawater temperature is between 16°C and 24°C. In this work, the effect of high temperatures (21°C, 26°C and 29°C) was evaluated on the susceptibility of oysters to OsHV- 1 but also on the virulence of virus.High temperatures (29°C) reduce the susceptibility of oysters to OsHV-1 without altering the infectivity of the virus and its virulence. High temperature could reduce viral infection and virus synthesis by reducing the...
Tipo: Text
Palavras-chave: Huître creuse; Transcriptomique; Interaction hôte/virus; Protéomique; Pacific oysters; Crassostrea gigas; OsHV-1; RNAseq; Temperature; Host/pathogen; Proteomic.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00499/61085/64545.pdf

Effects of temperature and salinity on haemocyte activities of the Pacific oyster, Crassostrea gigas (Thunberg)
Provedor de dados: 5
Autores: Gagnaire, Beatrice; Frouin, Heloise; Moreau, Kevin; Thomas Guyon, Helene; Renault, Tristan.
The Pacific oyster, Crassostrea gigas, is extensively cultivated and represents an important economic activity. Oysters are reared in estuarine areas, subjected to various biotic and abiotic factors. One of the limiting factors in aquaculture is mortality outbreaks, which may limit oyster production, and the causes of these outbreaks are not completely understood. In this context, the effects of temperature and salinity on Pacific oyster, C. gigas, haemocytes, were studied. Haemocytes are the invertebrate blood cells and thus have been shown to be involved in defence mechanisms. Flow cytometry was used for monitoring several haemocyte parameters. An increase of temperature induced an increase of haemocyte mortality, in both in vitro and in vivo...
Tipo: Text
Palavras-chave: Cellular activity; Flow cytometry; Salinity; Temperature; Haemocyte; Crassostrea gigas; Pacific oyster.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-934.pdf

Metabolic adjustments in the oyster Crassostrea gigas according to oxygen level and temperature
Provedor de dados: 5
Autores: Le Moullac, Gilles; Queau, Isabelle; Le Souchu, Pierrick; Pouvreau, Stephane; Moal, Jeanne; Le Coz, Jean-rene; Samain, Jean-francois.
The purpose of this study was to examine the responses of the oyster C. gigas to oxygen levels at subcellular and whole-organism levels. Two experiments were carried out. The first experiment was designed to measure at 15°C, 20°C and 25°C for 20 hours the clearance (CR) and oxygen consumption (OC) rates of oysters exposed at different concentrations of oxygen. The goal of this first part was to estimate the hypoxic threshold for oysters below which their metabolism shifts toward anaerobiosis, by estimating the oxygen critical point (PcO2) at 15, 20 and 25°C. The second experiment was carried out to evaluate the metabolic adaptations to hypoxia for 20 days at three temperatures: 12°C, 15°C and 20°C. The metabolic pathways were characterized by the...
Tipo: Text
Palavras-chave: Succinate; Alanine; Phosphoenolpyruvate carboxykinase; Pyruvate kinase; Temperature; Hypoxia; Oysters.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2693.pdf

Temperature and seston quantity and quality effects on field reproduction of farmed oysters, Crassostrea gigas, in Bourgneuf Bay, France
Provedor de dados: 5
Autores: Dutertre, Mickael; Beninger, Peter G.; Barille, Laurent; Papin, Mathias; Rosa, Philippe; Barille, Anne-laure; Haure, Joel.
The proliferation of the voluntarily-introduced cupped oyster, Crassostrea gigas, has attained the proportions of species invasion in many intertidal habitats in Europe, presumably resulting from successful reproduction of farmed individuals. It is thus imperative to better understand the reproductive characteristics of farmed oysters, since they are directly under human control. We quantified the dry tissue mass (DTM), gametosomatic index (GSI), and reproductive cycle of farmed oysters at two sites in Bourgneuf Bay, France, in relation to environmental parameters using continuously-recording probes in 2005 and 2006. The GSI was developed for this study, based on the actual area occupied by gametes, rather than the area of the gonad previously used for...
Tipo: Text
Palavras-chave: Atlantic Ocean; Crassostrea gigas; Oyster farming; Bivalve; Gametosomatic index; Biological invasion; Atresia; Oocytes; Turbidity; Temperature; Reproduction.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6871.pdf

Un modèle empirique du recrutement pour le stock de coquilles Saint Jacques, Pecten maximus (L.) en baie de Saint-Brieuc (Manche, France)
Provedor de dados: 5
Autores: Fifas, Spyros; Dao, Jean-claude; Boucher, Jean.
This paper proposes an empirical model for the recruitment of the scallop stock, Pecten maximus (L.), in Saint-Brieuc Bay (English Channel, France). This stock shows important fluctuations in recruitment. The use of traditional models for fish population dynamics based upon an equilibrium state were inadéquate. This model includes three independent variables: spawning biomass, effects of fishing effort on the unexploited year classes, and temperature. Correlations between these expressions of independent parameters and recruitment are systematically analysed. The choice of the final model relies on minimization of the total variance unexplained portion. Introduction of fishing pattern into the model is realized by testing fishing effort effects upon two...
Tipo: Text
Palavras-chave: Recrutement; Modèle empirique; Pecten maximus; Température; Biomasse féconde; Effort de pêche; Recruitment; Empirical model; Pecten maximus; Temperature; Spawning biomass; Fishing effort.
Ano: 1990
URL: http://archimer.ifremer.fr/doc/00189/30069/28557.pdf

Hydrological characterisation of Ria de Aveiro, Portugal, in early summer
Provedor de dados: 5
Autores: Dias, Jm; Lopes, Jf; Dekeyser, I.
The hydrological features of Ria de Aveiro, a coastal lagoon on the northwest Atlantic coast of Portugal, were investigated in two sampling surveys carried out between 3/6 and 24/6/97 and between 29/6 and 7/7/97, respectively There was a significant freshwater inflow into the lagoon during the first survey, especially in the first days, due to the recent rainfalls. Records concerning water level, salinity, temperature and current velocity were performed at several stations located along the four main channels of the lagoon. The type of tide at the mouth was determined and was observed that astronomical tide is the main forcing agent driving water circulation in Ria de Aveiro. The tide at the mouth is semidiurnal and the tidal wave propagation in the lagoon...
Tipo: Text
Palavras-chave: Surélévation; Salinité; Température; Vitesse du courant; Ria de Aveiro; Water level; Salinity; Temperature; Current velocity; Ria de Aveiro.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/00325/43597/43928.pdf

Histological and Morphometric Analysis of Testes of Adult Quail (Coturnix coturnix japonica) of Bangladesh
Provedor de dados: 77
Autores: Shil,Subrata Kumar; Quasem,Md. Abul; Rahman,Mohammad Lutfur.
A histological and morphometric study was conducted to evaluate the seasonal testicular variations in the adult Japanese quail (Coturnix coturnix japonica) in Bangladesh. The weight of birds and testes, volume, length, circumference, seminiferous tubule diameter, circumference and height of germinal epithelium of testes were measured. Sections of testes obtained from studied birds were stained with H&amp;E and images were taken by J software. Weight and volume of paired testes of quails significantly heavier (P&lt;0.05) in long day period of summer and rainy season (March ­ September) than the short day period of autumn and winter (October ­ February). Seasons had no significant effect on live weight gain of quails. The weight and diameter of testes or...
Tipo: Journal article
Palavras-chave: Japanese quail; Morphometry; Testis; Season; Day length; Temperature.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000100017

Selection of environmental temperature by the yellow scorpion Tityus serrulatus Lutz &amp;amp; Mello, 1922 (Scorpiones, Buthidae)
Provedor de dados: 80
Autores: Hoshino,K.; Moura,A. T. V.; De Paula,H. M. G.
The preferred temperature of the yellow scorpion Tityus serrulatus was investigated since its dispersion is a matter of concern. Adult T. serrulatus, weighing 1.24 + 0.20 g (mean + sd) and with a standard length of 59.3 + 2.5 mm, were used. A metallic corridor (120 cm long, 5 cm large and 10 cm high) with thermal gradient ranging from 0°C to 40°C was used. Tityus serrulatus chose and stayed in temperatures ranging from 14°C to 38°C when safe conditions were offered (dark and thigmotactic stimuli). The number of animals that remained in the 11°C-20°C, 21°C-30°C, and 31°C-40°C temperature zones were 8, 8, and 9, respectively. The chi-square test (degree of freedom = 2) showed that differences were not significant (p&gt;0.05). Some animals moved to lower...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tityus serrulatus; Scorpion; Temperature; Thermal gradient; Zoogeography.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992006000100005

Impact of climate and moonlight on a venomous mammal, the Javan slow loris (Nycticebus javanicus Geoffroy, 1812)
Provedor de dados: 16
Autores: Rode-Margono, E.J.; Nekaris, K.A.-I.
Predation pressure, food availability, and activity may be affected by level of moonlight and climatic conditions. While many nocturnal mammals reduce activity at high lunar illumination to avoid predators (lunarphobia), most visually-oriented nocturnal primates and birds increase activity in bright nights (lunarphilia) to improve foraging efficiency. Similarly, weather conditions may influence activity level and foraging ability. We examined the response of Javan slow lorises (Nycticebus javanicus Geoffroy, 1812) to moonlight and temperature. We radio-tracked 12 animals in West Java, Indonesia, over 1.5 years, resulting in over 600 hours direct observations. We collected behavioural and environmental data including lunar illumination, number of human...
Tipo: Article / Letter to the editor
Palavras-chave: Activity; Environmental factors; Humidity; Lunarphobia; Moon; Predation; Temperature; 42.84.
Ano: 2014
URL: http://www.repository.naturalis.nl/record/499291

Laboratory environment effects on the reproduction and mortality of adult screwworm (Diptera: Calliphoridae)
Provedor de dados: 82
Autores: Berkebile,Dennis R.; Sagel,Agustin; Skoda,Steven R.; Foster,John E.
The New World screwworm, Cochliomyia hominivorax Coquerel, is mass reared for screwworm eradication initiatives that use the sterile insect technique. New methods for rearing have helped to reduce the cost of the eradication program. We examined the effect and interaction of three temperatures (24.5, 29.5 and 34.5ºC), two diets (2% spray-dried blood plus 0.05% vitamins and corn syrup carrageenan) and three population densities (300, 400, and 500 flies/cage) on egg production, egg hatch, number of observable fertilized eggs, mortality (male and female) and ovarian development. The three population densities did not affect any of the parameters monitored. Using the protein diet increased egg production at all temperatures. Diet did not affect egg hatch or...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Temperature; Cochliomyia hominivorax; Egg production; Ovarian development.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2006000600010

Biology of Diadegma sp. (Hymenoptera: Ichneumonidae), a parasitoid of Plutella xylostella (L.) (Lepidoptera: Yponomeutidae), from Reunion Island
Provedor de dados: 82
Autores: MONNERAT,R.G.; KIRK,A.A.; BORDAT,D.
The genus Diadegma have some species able to parasite Plutella xylostella (L.) (DBM). Laboratory studies were carried out on a Diadegma sp. from Reunion Island to elucidate its ability to parasite DBM larvae, and to determine the influence of the temperature on its fecundity, longevity, oviposition and the consumption of cabbage leaves by parasitized DBM larvae. Parasitism rates were close to 70% for the L2 and L3 instar, and 53% for the L4. At 15°C, there were no progeny. At 20°C and 25°C, the percentage of parasitism was near 70%. At 29°C, the percentage parasitism was similar but the number of males produced was higher. Parasitized DBM larvae consumed 35% less leaf surface than non parasitized larvae. This Diadegma sp. is a possible candidate for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Natural enemies; Cabbage; Temperature; Parasitism; Diamondback moth.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2002000200015

Partial characterization of digestive proteases in juveniles of Microphis brachyurus (short-tailed pipefish) (Syngnathiformes: Syngnathidae)
Provedor de dados: 83
Autores: Martínez-Cárdenas,Leonardo; Frías-Quintana,Carlos A.; Álvarez-González,Carlos A.; Jiménez-Martínez,Luis D.; Martínez-García,Rafael; Hernández-Almeida,Oscar U.; Bello-Pineda,Javier; Arellano-Méndez,Leonardo U.; Ponce-Palafox,Jesús T.
ABSTRACT Short-tailed pipe fish (Microphis brachyurus) is a freshwater organism with high economic potential for the aquarium hobby, so it is necessary to implement methods to promote its culture through studies of digestive physiology. General activities of acid and alkaline proteases were evaluated, as well as the effect of pH, temperature and inhibitors. The optimal pH of stomach proteases was 2, while the optimal pH of intestinal proteases was 10. Optimal temperature for the acidic proteases was 35 ºC, while for alkaline proteases it was 45 ºC. Thermal stability showed high resistance at 35 ºC for both acid and alkaline proteases (above 100% residual activity). Acid proteases are resistant at pH 2 (50% of residual activity), meanwhile alkaline...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Enzyme activity; Sygnathidae; PH; Protease inhibitors; Temperature.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252020000200212

Comparative characterization of digestive proteases in redhead cichlid (Vieja melanurus) and twoband cichlid (Vieja bifasciata) (Percoidei: Cichlidae)
Provedor de dados: 83
Autores: Frías-Quintana,Carlos Alfonso; Peña-Marín,Emyr Saul; Ramírez-Custodio,Carlos David; Martínez-García,Rafael; Jiménez-Martínez,Luis Daniel; Camarillo-Coop,Susana; Guerrero-Zárate,Rocío; Asencio-Alcudia,Gloria Gertrudys; Álvarez-González,Carlos Alfonso.
ABSTRACT In the Southeast of Mexico, there are many native cichlids with commercial interest such as redhead cichlid (Vieja melanurus) and twoband cichlid (V. bifasciata), which have a great local demand and excellent meat quality. However, it is necessary to implement their culture based on nutrition studies and digestive biochemistry. This study’s objective was to characterize these two cichlids’ digestive proteases (pH, temperature, and inhibitors) through biochemistry techniques. Results showed that V. melanurus and V. bifasciata have a digestive capacity analogous to other omnivore fishes, where the optimal pH values of stomach proteases (4 and 2, respectively) and intestinal proteases (6 and 12, respectively), the optimal temperature of acid (35°C...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Inhibitors; PH; Proteases; Stability; Temperature.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252021000100210

Effects of Seasonal Changes on In Vitro Developmental Competence of Porcine Oocytes
Provedor de dados: 19
Autores: SUZUKI, Yo; WATANABE, Hiroyuki; FUKUI, Yutaka; 福井, 豊.
The aim of this study was to investigate whether seasonal changes affected in vitro developmental competence of porcine oocytes. The relationship between atmospheric temperature and embryonic development of in vitro matured porcine oocytes following intracytoplasmic sperm injection was examined throughout the year. The blastocyst rate (31.1%) in winter (mean atmospheric temperature during December to February: -3.8 C) was significantly higher (P&lt;0.05) than those of other seasons in 2008/2009 (19.7-23.5%; 6.3-17.5 C). The monthly mean blastocyst rates were negatively correlated with the temperatures (r=-0.5944, P&lt;0.05). The results of the present study suggest that porcine embryos could be produced throughout the year, but the in vitro production...
Palavras-chave: Embryonic development; Pig; Seasonal changes; Temperature.
Ano: 2010
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/2814

An analysis of natural factors of traffic accidents involving Yezo deer (Cervus nippon yesoensis)
Provedor de dados: 19
Autores: Kawata, Yukichika.
In Hokkaido, Japan, the number of Yezo deer (Cervus nippon yesoensis) has recently increased drastically, causing a large number of deer-vehicle traffic accidents. This paper examines conditions related to deer-vehicle traffic accidents by analysing the following relationships: time of accident and lunar phase; time of accidents and time of sunrise/sunset; likelihood of accidents and rainfall patterns, temperature and season (particularly snow and hunting seasons). The results suggest that the potential for deer-vehicle traffic accidents increases during hunting and non-snow seasons when there is little or no rainfall, just before sunrise or just after sunset, or during a full, first quarter, or third quarter moon. A statistically significant relationship...
Palavras-chave: Deer-vehicle traffic accidents; Hunting season; Lunar phase; Rainfall; Snow season; Sunrise/sunset; Temperature.
Ano: 2011
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3079

The kinetic analysis and simulation of hardening in bread made by the yudane dough method
Provedor de dados: 19
Autores: Tsuboi, Kazumasa; Ohara, Ami; Matsushita, Koki; Yamada, Daiju; Santiago, Dennis Marvin; Kawakami, Sakura; Koaze, Hiroshi; Yamauchi, Hiroaki.
Pullman type white breads with or without Yudane dough at 10 and 20% (w/w, flour base) were made by the no first fermentation method. Yudane dough was prepared by mixing boiling water and flour at a 1:1 ratio. The breads were stored at various temperature conditions and then subjected to analyses of bread hardening (temporal changes in hardness), hardening rate constant of bread (HRC), and simulation of hardening behavior using a hardening model. The results were as follows: The hardening of all breads slowed with the increase in storage temperature. The hardening of breads made with Yudane dough (Yudane breads) was slower than that without Yudane dough (Control) at any storage temperature. The HRC of all breads sharply decreased with the increase in...
Palavras-chave: Bread; Temperature; Hardening; Kinetic model; Simulation.
Ano: 2017
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4484

The life span of theront stages of Cryptocaryon irritans in different media, temperature and salinity
Provedor de dados: 19
Autores: Chu, Kua Beng; Seng, Leong Tak; Yong, Wong See; Thye, Chuah Toh; Veloo, Palanisamy.
Study on the in vitro survival of the theront stages of Cryptocaryon irritans in different nutrient media, temperature and salinity showed that these three factors could influence then- life span. Theront of C. irritans had a longer mean life span in HBSS (62.40±23.02 hrs) and BBSS (46.64 ± 13.29 hrs) compared to control seawater medium (29.23 ± 6.81 hrs). The shortest mean life span was obtained from the MEME non-essential ammo acid medium ranging from 0.45 to 0.83 hrs. Out of 9 media, only 2 media (HBSS and BBSS) managed to prolong the life span of theront compared to the other 7 media (MEME, MEME non-essential amino acid, L-15 with 5% serum, L-15 with 10% serum, tissue homogenate (gills, scale &amp; mucus, fin and muscle). Tukey HSD analysis showed that...
Palavras-chave: Cryptocaryon irritans; Theront; Fish protozoan; Temperature; Media; Salinity.
Ano: 2001
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/139

Efectos del ENOS sobre la temperatura superficial  del mar y la abundancia de larvas de peces en las  aguas oceánicas de Cuba
Provedor de dados: 20
Autores: Gutiérrez Delgado, A. R.; Alvarez Cruz, A.; Frías, M. del P.; Alfonso, I.
Esta investigación muestra los efectos del evento ENOS 1997-1998 en la temperatura  superficial del mar (TSM) y en la abundancia de larvas  de peces de las familias  Thunnidae, Carangidae y Lutjanidae en las aguas oceánicas adyacentes a Cuba. La data  histórica está integrada por 37 cruceros oceanográficos realizados entre los años 1966  y 1999. De ellos, 3 cruceros fueron realizados bajo el efecto del ENOS 1997-1998 en  los meses de diciembre de 1997, septiembre de 1998 y mayo de 1999. También fue  utilizada la serie de TSM desarrollada en  el Centro Meteorológico Nacional de la  NOAA para la cuadrícula de Cuba 23º-24ºN y 74º-85ºO entre los años 1966 y 1999.  Las anomalías térmicas de la TSM, durante septiembre de 1998, provocaron un  aumento tanto de la...
Tipo: Book
Palavras-chave: Temperature; Water levels; Spawning; Pelagic fish; Fish.
Ano: 2008
URL: http://hdl.handle.net/1834/5789

Tasas de filtración y aclaramiento en la almeja mano de león (Nodipecten subnodosus Sowerby, 1835) a dos tallas, en función de la temperatura y cantidad del alimento
Provedor de dados: 20
Autores: López, J.A.
Se estudió la tasa de filtración (TF) y de aclaramiento (TA) en juveniles de 46.1 ± 2.2 y 65.1 ± 1.9 mm de altura de Nodipecten subnodosus expuesto a una combinación de siete tratamientos de concentración de la microalga Isochrysis galbana (entre 1.7 x 104 y 4.7 x 105 cél/mL), y tres temperaturas (19, 24 y 28 °C). Además se investigó la actividad alimenticia en almejas de mayor talla, a condiciones variables (24 ± 4 °C) y constantes (24 °C) de temperatura, determinándose si la especie era un filtrador continuo o discontinuo, y si existía un efecto de la iluminación (0 y 420 lx) sobre la TF. La TF fue similar a 24 y 28 °C pero más alta que a 19 °C (P&gt;0.05), en las dos tallas y en todas las concentraciones probadas. La TF fue dependiente de la...
Tipo: Theses and Dissertations
Palavras-chave: 973; Marine molluscs; Temperature; Filtration; Temperature; Filtration; Http://aims.fao.org/aos/agrovoc/c_7657; Http://aims.fao.org/aos/agrovoc/c_2900.
Ano: 2003
URL: http://hdl.handle.net/1834/3432

Variación mensual del plancton en una estación fija La Libertad (Salinas), Ecuador.  Período: 1988 - 1989
Provedor de dados: 20
Autores: Bonilla, M.A.
El presente trabajo es el resultado del estudio cuali-cuantitativo de análisis de plancton colectado mediante muestreos mensuales en aguas superficiales costeras en una estación fija en La Libertad (Salinas) entre diciembre 1988 y diciembre 1989. Se dan a conocer 29 grupos de organismos del zooplancton, determinándose que los dominantes en orden decreciente fueron: larvas de eufáusidos, quetognatos, apendicularios, larvas de decápodos, huevos de peces, foraminíferos, cladóceros, huevos de decápodos y los más frecuentes: copépodos, apendicularios, quetognatos, larvas de decápodos y huevos de peces. Se presentan las especies más abundantes y dominantes de copépodos en orden decreciente: Acartia levequei, Centropages furcatus y Temora discaudata. Se determina...
Tipo: Journal Contribution
Palavras-chave: Plankton; Zooplankton; Seasonal distribution; Geological distribution; Salinity; Temperature; Plankton; Zooplankton; Salinity; Temperature; Http://aims.fao.org/aos/agrovoc/c_5950; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_6751; Http://aims.fao.org/aos/agrovoc/c_7657.
Ano: 1990
URL: http://hdl.handle.net/1834/2165

Variaciones verticales y su relación con algunos parámetros físico-químicos en una estación fija en el área externa del Golfo de Guayaquil
Provedor de dados: 20
Autores: Chiriguaya, J.; Burgos, L.
Las variaciones hidroquímicas (oxígeno disuelto, nitrato, fosfato y silicato) fueron estudiadas durante 12 horas con intervalos de aproximadamente 3 horas en una estación fija situada frente al Golfo de Guayaquil entre las coordenadas 02° 59' 42 S-81° 40' 92 W. La máxima profundidad en la que se efectuó dicho análisis fue hasta los 50 metros. Se ha detectado una posible relación entre las variaciones verticales (Ondas Internas) y los parámetros físico-químicos, ya que las fluctuaciones de ascensos y descensos fueron observadas en las concentraciones de oxígeno y nutrientes, siendo las ondas internas un factor preponderante en los movimientos verticales de éstos. Estas fluctuaciones también fueron encontradas en el comportamiento de la temperatura,...
Tipo: Journal Contribution
Palavras-chave: Chemical oceanography; Temperature; Salinity; Vertical distribution; Chemical oceanography; Temperature; Salinity; Http://aims.fao.org/aos/agrovoc/c_1516; Http://aims.fao.org/aos/agrovoc/c_7657; Http://aims.fao.org/aos/agrovoc/c_6751.
Ano: 1990
URL: http://hdl.handle.net/1834/2179

Pérdidas ocasionadas por  insectos en cacao almacenado
Provedor de dados: 20
Autores: Fraga, R.; Carrillo, M.; Pedroso, H.
Se evaluaron las pérdidas que Lasioderma serricorne (F.) y Araecerus fasciculatus  (De G.), ocasionaron en el cacao almacenado durante tres meses bajo condiciones controladas de temperatura (28 ± 2 ºC) y humedad relativa (73 %). Se determinó el consumo de materia seca de cada estadio biológico activo y la pérdida de peso, los granos dañados y la producción de polvo, ocasionada por cada especie durante su desarrollo. Los estadios larval y adulto de L. sericorne fueron los que mayor cantidad de cacao ingirieron,  alcanzando valores de 6,76 y 0,81 mg, respectivamente. A los 90 días de almacenamiento, la especie L. serricorne ocasionó 20,3 % de pérdida en peso, 31,5 % de granos dañados y 14,8 % de producción de polvo.
Tipo: Journal Contribution
Palavras-chave: Weight; Storage; Temperature; Cocoa beans; Weight losses; Spoilage; Humidity; Pests.
Ano: 2008
URL: http://hdl.handle.net/1834/5011

Reproductive cycle of edible echinoderms from the Southwestern Indian Ocean:  I. Tripneustes gratilla L. (Echinoidea, Echinodermatata)
Provedor de dados: 20
Autores: Vaïtilingon, D.; Rasolofonirina, R.; Jangoux, M.
The reproductive cycle of the edible echinoid Tripneustes gratilla (Linneaus 1758) was investigated in a population located in the southwest coast of Madagascar (Toliara). The reproductive cycle was followed for two consecutive years (October 1999 to October 2001) and characterised by means of gonad and maturity indices. T. gratilla has an annual reproductive cycle mediated by seawater temperature, day length and feeding activity. The histology of the gonads revealed six different maturity stages grouped in three main reproductive phases: growing and maturing, spawning, and spent and recovering. Reproduction is seasonal. Growing and maturing stages occurred from late summer to early winter correlating with decreasing temperatures and day length. Spawning...
Tipo: Journal Contribution
Palavras-chave: TRIPNEUSTES GRATILLA; Abiotic factors; Sexual maturity; Reproductive cycle; Temperature; Sea water; Maturity; Temperature.
Ano: 2005
URL: http://hdl.handle.net/1834/1133

Distribución y composición del macrozooplancton en Bahía Chile y Ensenada Guayaquil, Isla Greenwich-verano austral 1998
Provedor de dados: 20
Autores: Ortega, D.
Durante el verano austral, se efectuó la VII Expedición Antártica Ecuatoriana, a bordo del B/I Orión, perteneciente a la Armada del Ecuador. Entre los meses de enero y febrero de 1998, en la Ensenada Guayaquil y Bahía Chile (Isla Greenwich), se colectaron y analizaron muestras de macrozooplancton obtenidas de arrastres superficales con redes tipo cónica simple de 500μ m, con la finalidad de conocer la distribución y composición del zooplancton. Las salpas fueron los organismos más representativos con el 46%, en segundo lugar estuvieron los copépodos 17% y quetognatos 15%, en la Ensenada Guayaquil donde también se presentó la mayor heterogeneidad zooplanctónica, registrándose la mayor distribución al oeste, próximo a la Isla Dee. En Bahía Chile, la...
Tipo: Journal Contribution
Palavras-chave: Distribution; Composition; Temperature; Salinity; Zooplankton; Distribution; Zooplankton; Temperature; Salinity; Http://aims.fao.org/aos/agrovoc/c_35773; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_7657; Http://aims.fao.org/aos/agrovoc/c_6751.
Ano: 1998
URL: http://hdl.handle.net/1834/3851

Contribución al conocimiento de la oceanografía física del Estrecho Bransfield
Provedor de dados: 20
Autores: Zambrano Q., E.; Cardin, V.
Durante el verano austral de 1988, el Ecuador realizó la Primera Expedición Científica a la Antártica abordo del buque oceanográfico ORION. Se investigó en detalle el Estrecho Bransfiel realizándose un total de 23 estaciones oceanográficas, en las que se tomó información desde la superficie hasta los 500 m. de profundidad, obteniéndose datos de temperatura y salinidad, además de parámetros químicos y bilógicos. En este trabajo se presenta una descripción de las condiciones oceanográficas predominantes durante las fechas del muestreo así como la estructura termohalina del estrecho; mediante el uso de diagramas T-S se identificaron las masas de agua presentes en la región. Del análisis de la topografía dinámica se deduce que la circulación es hacia NE y, en...
Tipo: Journal Contribution
Palavras-chave: Temperature; Salinity; Water masses; Thermohaline circulation; Dynamic topography; Oceanographic stations; Physical oceanography; Physical oceanography; Temperature; Salinity.
Ano: 1989
URL: http://hdl.handle.net/1834/3826

Hydrological Characteristics of Cienfuegos’ Bay, Cuba, Related to the Presence  of the Invasive Green Mussel Perna viridis
Provedor de dados: 20
Autores: Garcés, Y.; Betanzos, A.; Lopeztegui, A.; Artiles, A.
The aim of this work was to analyze hydrological condition variations in Cienfuegos’ Bay in 2011 and its possible  influence in life cycle and distribution of the green mussel  Perna viridis. The hydrological parameters in the bay are described  according to the campaigns performed in February, May and November. Samples from two levels (surface and bottom) were taken, in  order to get water temperature, salinity and dissolved oxygen. The results show the climatic seasonality influence (dry and rain) both  in spatial as well as in vertical distribution of the observed parameters. The mean concentrations of the analyzed hydrological  markers were in agreement with the NC 25: 1999 requirements of good quality water  for fishing use. The observed hydrological...
Tipo: Journal Contribution
Palavras-chave: Marine aquaculture; Temperature; Parameters; Environmental conditions; Salinity effects.
Ano: 2012
URL: http://hdl.handle.net/1834/5349

Contribution à l'analyse d’intensité de l'upwelling près du Cap Blanc (Mauritanie) à partir des températures d'eau de la station « standard » Bayadère
Provedor de dados: 20
Autores: Loktionov, Y.
Cet article décrit les résultats d’une analyse du niveau de corrélation entre les températures d’eau près de la bouée Bayadère (20°40’N – 17°04’W) et l’intensité de l’upwelling dans le secteur du Cap Blanc. La relation entre les températures d’eau et l’activité du vent (Indice d’upwelling) a été étudiée en intégrant la variabilité saisonnière des conditions thermiques dans cette région. Une modification de cette relation en fonction des saisons hydrologiques a été mise en évidence.
Tipo: Journal Contribution
Palavras-chave: Seasonal distribution; Seasonal variations; Surface currents; Surface temperature; Temperature; Upwelling; Temperature; Http://aims.fao.org/aos/agrovoc/c_7657.
Ano: 1989
URL: http://hdl.handle.net/1834/1143

Effets de la  salinité et de la température du milieu sur le degré de saturation des acides gras et sur les différentes catégories lipidiques des alevins de Mugil cephalus.
Provedor de dados: 20
Autores: El Cafsi., M.; Kheriji., S.; Masmoudi., W.; Romdhane., M.S.
Le suivi de l’évolution des lipides des alevins de Mugil cephalus en fonction de la salinité et de la température du milieu, montre qu’après acclimatation à 14°C, le rapport acides gras polyinsaturés/acides gras saturés, chez les alevins acclimatés à la basse salinité (0,5‰) augmente de 6,5%. D’autre part, nous avons noté une diminution de 65% de la masse des triacylglycérols et une augmentation de 37% de celle des lipides polaires.  Par ailleurs, nous avons relevé que l’abaissement de la température du milieu de 26 à 14°C, entraîne une augmentation plus importante du rapport acides gras polyinsaturés/acides gras saturés à 0,5‰ qu’à  35‰. La diminution de la température du milieu provoque  une augmentation respective de 365 et de 53%, de la masse des...
Tipo: Journal Contribution
Palavras-chave: Biochemical composition; Salinity; Lipids; Fry; Fatty acids; Temperature; Accumulation; Mugil cephalus; Http://aims.fao.org/aos/agrovoc/c_35403.
Ano: 2000
URL: http://hdl.handle.net/1834/4296

GTSPP real-time quality control manual
Provedor de dados: 20
This manual has been produced within the context of the Global Temperature Salinity Pilot Project (GTSPP). Because of the work of assuring the quality of data handled by the Project is shared amongst data centres, it is important to have both consistent and well documented procedures. This manual describes the means by which data quality is assessed and the actions taken as a result of the procedures.
Tipo: Report
Palavras-chave: Temperature; Salinity.
Ano: 1990
URL: http://hdl.handle.net/1834/4331

Project Report: Global Temperature and Salinity Profile Programme (GTSPP): presented at the Twenty-first Session of the IOC Committee on International Oceanographic Data and Information Exchange (IODE-XXI), Liège, Belgium, 23-26 March 2011.
Provedor de dados: 20
Autores: Sun, Charles.
The Global Temperature and Salinity Programme (GTSPP) is a joint program of the International Oceanographic Data and Information Exchange (IODE) and the Joint Commission on Oceanography and Marine Meteorology (JCOMM°. The document summarizes the GTSPP progress made covering the past two years period 2009-2010 and shows how GTSPP continues to develop in response to evolving needs. It also provides the GTSPP work plan in 2011 and 2012-2013. The GTSPP bi-annual report gives the detailed information about the program and progress made during the inter-session period. A draft GTSPP bi-annual report for 2009-2010 has been completed and is posed at the GTSPP Web Site.
Tipo: Working Paper
Palavras-chave: Temperature; Salinity profiles.
Ano: 2011
URL: http://hdl.handle.net/1834/5648

La subcorriente ecuatorial: características oceanográficas alrededor de las Islas Galápagos
Provedor de dados: 20
Autores: Lucero, M.
El propósito de este trabajo consiste en presentar nuevas evidencias de la presencia de esta subcorriente, que pasa a través de las Islas Galápagos y que sus aguas han sido observadas hasta los 82°W (frente al Golfo de Guayaquil), este trabajo esta basado en mediciones directas de corrientes efectuadas a bordo del BAE ORION, en un crucero oceanográfico desarrollado entre abril y mayo del 2002.
Tipo: Journal Contribution
Palavras-chave: Temperature; Salinity; Surface salinity; Upwelling; Equatorial undercurrents; Cruises; Temperature; Salinity; Http://aims.fao.org/aos/agrovoc/c_7657; Http://aims.fao.org/aos/agrovoc/c_6751.
Ano: 2004
URL: http://hdl.handle.net/1834/2375

Caracterización de la temperatura superficial del mar en los sitios de visita turística de la Reserva Marina de Galápagos
Provedor de dados: 20
Autores: Ortega, J.; Jara, V.; Alvarez, M.; Rentería, W.
El presente estudio consiste en un análisis descriptivo de los parámetros físicos (temperatura-salinidad) y corrientes superficiales y sub-superficiales, obtenidos en los sitios de visita turística de la Reserva Marina de Galápagos (RMG), los cuales describen las condiciones oceanográficas de dichos lugares. Estos datos han sido procesados con el propósito de establecer una caracterización de la temperatura superficial del mar en estos sitios, y sus variaciones a lo largo del 2011. Esta caracterización será soportada con el uso de los datos del Análisis Operacional de Temperatura Superficial del Mar y de Hielo Marino (UKMO-L4HRfnd-GLOB-OSTIA) a fin de conseguir una continuidad en la serie de tiempo anual.
Tipo: Journal Contribution
Palavras-chave: Temperature; Salinity; Surface temperature; Sea ice; Marine parks; Surface currents currents.
Ano: 2012
URL: http://hdl.handle.net/1834/4658

Oceanographic and faunistic structures across an Angola Current intrusion into northern Namibia waters.
Provedor de dados: 20
Autores: John, H.C.H.; Mohrholz, V.; Lutjeharms, J.R.E.
It is thought that the penetration of Angolan waters through the Angola–Benguela Frontal Zone (ABFZ) into the much cooler Benguela regime may come about by a poleward slope undercurrent as well as by cross-frontal filaments. To test this hypothesis, two zonal transects off the northern Namibian coast were surveyed by CTD casts, current measurements and ichthyoplankton samples during April 1999. Simultaneous sea-surface temperature (SST), chlorophyll-a concentration, and wind data were obtained from satellite. The multidisciplinary results are described.An intense intrusion of the Angola Current into northern Namibian waters occurred with distinct signals of high temperatures and salinities, low chlorophyll-a concentration, and Angolan fish larvae of both...
Tipo: Journal Contribution
Palavras-chave: Oceanographic data; Fauna; Frontal features; Chlorophylls; Temperature; Mesoscale features; Larvae; Surveys; Fish larvae; Hydrography.
Ano: 2004
URL: http://hdl.handle.net/1834/4937

Efecto de los parámetros en la extracción alcalina de colorante de bija. Parte 1
Provedor de dados: 20
Autores: García, Y.; Núñez de Villavicencio, M.; Rodríguez, J. L.; Borrego, I.; Cruz, L.
Se investigó la influencia de la temperatura (50 y 60 ºC), la relación disolvente-semillas (3:1 y 5:1), la agitación (100 y 300 rev/min) y la concentración de hidróxido de sodio (0,5 y 1,0 N) en la extracción de colorante de bija. La extracción se favoreció con el aumento de la temperatura y la disminución de la concentración de sosa. La agitación prácticamente no causó efectos en los niveles de extracción. Las relaciones disolvente-semillas ensayadas no tuvieron incidencia en la cantidad de pigmentos extraída.
Tipo: Journal Contribution
Palavras-chave: Extraction (salts); Temperature; Solvents; Hydroxides; Annatto (tree); Sodium hydroxide; Chemical concentration.
Ano: 2008
URL: http://hdl.handle.net/1834/5026

El Niño 2006-2007. Desarrollo y manifestaciones en aguas ecuatorianas
Provedor de dados: 20
Autores: Zambrano, E.
Se revisan las características generales de los eventos El Niño en el Pacífico Tropical y la manera como se manifiestan frente a las costas del Ecuador. Se analiza la elevación del nivel del mar en la estación de La Libertad y se compara con el contenido de calor en el Pacífico central. Utilizando la información de las boyas del programa TAO se analiza la propagación de temperatura y altura dinámica desde el Pacífico ecuatorial occidental hasta el borde oriental. De igual manera se analiza el arribo de ondas ecuatoriales al borde oriental del Pacífico y su incidencia en el nivel medio del mar. El Niño 2006-07 concluyó rápidamente y de intensidad débil; puede considerarse como en evento de corta duración que presentó las características generales de otros...
Tipo: Journal Contribution
Palavras-chave: El Nino phenomena; Sea level; Buoys; Rain; Edge waves; Equatorial waves; Temperature; Sea level; Rain; Temperature.
Ano: 2007
URL: http://hdl.handle.net/1834/2337

Caracterização da hidrodinâmica e do estado trófico da lagoa de Bilene, Sul de Moçambique
Provedor de dados: 20
Autores: André, E.
Foi observado um evento de afloramento de algas nocivas e morte maciça de peixes e interrupção temporária das actividades turísticas na lagoa de Bilene, Moçambique em 2007. O presente estudo pretende fazer uma caracterização da hidrodinâmica e do estado trófico desta lagoa e compreender processos que resultam em afloramentos de algas tóxicas. Entre Julho de 2010 e Agosto de 2011, foram realizados oito campanhas de colheitas de dados de CTD incluindo a concentração de oxigénio em água,cobrindo um ciclo anual. Os resultados revelaram que a Lagoa de Bilene contem duas sub-bacias, uma a sul, maior em extensão geográfica mas menos profunda, e uma bacia a norte, com menor extensão geográfica mas mais profunda. As massas de água tem uma caracterização típica com...
Tipo: Journal Contribution
Palavras-chave: Eutrophication; Fertilization (biological); Salinity; Oxygen; Temperature; Oxygen deficiency; Temperature.
Ano: 2012
URL: http://hdl.handle.net/1834/5143

Studies on Tanzanian hypneaceae: seasonal variation in content and quality of Kappa-Carrageenan from Hypnea musciformis (Gigartinales : Rhodophyta)
Provedor de dados: 20
Autores: Buriyo, A.S.; Mtolera, M.S.P.
Seasonal effects on yield and quality of kappa-carrageenan from the red alga Hypnea musciformis were investigated in samples collected from natural populations in Oyster Bay, Dar es Salaam during June 1996–May 1997. The mean annual carrageenan yield, gel strength (after treatment with 0.1 M KCl) gelling and melting temperature (± standard deviation) were 25.24 ± 4.44 % dry weight, 171.72 ± 41.42 g/cm2, 54.66 ± 3.12 ºC and 68.62 ± 0.60 ºC, respectively. Carrageenan yield and quality (gel strength) during the SE and NE monsoon seasons were not significantly different (t = 0.55, p &gt; 0.05) and (t = 1.91, p &gt; 0.05), respectively. The reported carrageenan yield and gel strength values were, respectively, about 50% and 40% those of carrageenan from...
Tipo: Journal Contribution
Palavras-chave: Mariculture; Algal blooms; Temperature; Algal blooms; Http://aims.fao.org/aos/agrovoc/c_32367.
Ano: 2004
URL: http://hdl.handle.net/1834/1089

Short-term variability in alongshore  winds and temperature off Swakopmund, Namibia, during a non-upwelling event in 1998-1999.
Provedor de dados: 20
Autores: Bartholomae, Ch.; Hagen, E.
Swakopmund is a popular coastal resort in Namibia, especially during the summer holiday season when daily sea temperatures can fluctuate several degrees in a short period. Hourly measurements of the nearbottom water temperature were collected off the Swakopmund Jetty to investigate the thermal variability in relation to local winds. The thermal regime of this coastal region appears to be controlled by the locally forced Ekman offshore transport. Related changes in offshore transport led those of the surf-zone temperature by about one day. A transfer of kinetic energy from the alongshore wind into the temperature field of the nearshore zone dominated relative short time scales (hourly). The longer periods (7–9 days) are associated with the forcing of...
Tipo: Journal Contribution
Palavras-chave: Variability; Winds; Temperature; Upwelling; Fish species; Shelf geology; Currents (water); Anomalies; Surf; Continental shelf; Coastal upwelling; Nearshore environment.
Ano: 2007
URL: http://hdl.handle.net/1834/4936

Cyanobacterial occurrence and diversity in seagrass meadows in coastal Tanzania
Provedor de dados: 20
Autores: Lyimo, T.J.; Hamisi, M.I.; Muruke, M.H.S.
We report on the occurrence and diversity of cyanobacteria in intertidal seagrass meadows at Ocean Road and Mjimwema, Dar es Salaam, Tanzania. Nutrients, temperature and salinity were measured as comparative environmental factors. A total of 19 different cyanobacteria taxa were encountered, out of which eight were found exclusively in Mjimwema, four exclusively in Ocean Road and seven were common to both sites. Oscillatoria, Lyngbya and Spirulina were the dominant cyanobacterial genera. Cyanobacterial coverage was higher in Mjimwema (31–100%) than in Ocean Road (0–60%). The levels of nutrients in tidal pool waters at Ocean Road ranged from 0.45–1.03 ìmol NO3 -N/l, 0.19–0.27 ìmol NO2 -N/l and 0.03–0.09 ìmol PO4 -P/l. At Mjimwema the nutrient concentration...
Tipo: Journal Contribution
Palavras-chave: Sea grass; Salinity; Temperature; Bacteria; Nutrients; Salinity; Temperature; Http://aims.fao.org/aos/agrovoc/c_5274; Http://aims.fao.org/aos/agrovoc/c_6751; Http://aims.fao.org/aos/agrovoc/c_7657.
Ano: 2004
URL: http://hdl.handle.net/1834/1137

Maduración y desove del pargo amarillo Lutjanus argentiventris (Peters, 1869) en condiciones controladas de temperatura y fotoperíodo
Provedor de dados: 20
Autores: Martínez, R.A.
El cultivo de peces marinos ha atraído considerable atención en la última década, experimentando un gran auge en años recientes. Esto se debe principalmente al desarrollo y optimización de la tecnología de cultivo en jaulas, como también al mejoramiento de las técnicas de producción de juveniles, lo que ha incrementado el número de especies para las cuales existen cultivos de orientación comercial. En las circunstancias actuales, para que el cultivo de peces sea rentable es necesario controlar todas las fases del ciclo vital de la especie. En el presente trabajo se abordó esta problemática a través de estudios enfocados a la maduración gonadal y desove a través de tratamientos de temperatura y fotoperíodo denominados no invasivos. En el primer experimento...
Tipo: Theses and Dissertations
Palavras-chave: 959; Temperature; Lipids; Photoperiods; Marine fish; Fish culture; Fish culture; Temperature; Lipids; Http://aims.fao.org/aos/agrovoc/c_2918; Http://aims.fao.org/aos/agrovoc/c_7657; Http://aims.fao.org/aos/agrovoc/c_4362.
Ano: 2003
URL: http://hdl.handle.net/1834/3445

Project Report: Global Temperature and Salinity Profile Programme (GTSPP)
Provedor de dados: 20
Autores: Sun, Charles.
The document summarizes the Global Temperature and Salinity Profile Programme (GTSPP) progress made covering the past two year period 2007-2008 and provides the GTSPP work plans in 2009 and 2010. A summary meeting report for the most recent ad hoc session on the GTSPP is also attached in the Appendix.
Tipo: Conference Material
Palavras-chave: Temperature; Salinity profiles; Temperature; Http://aims.fao.org/aos/agrovoc/c_7657.
Ano: 2009
URL: http://hdl.handle.net/1834/2991

Oceanographic conditions at the southern end of the argentine continental slope
Provedor de dados: 20
Autores: Guerrero, R.A.; Baldoni, A.G.; Benavides, H.R.
The characteristics of the upper Antartic Intermediate water (AAIW) entering the Southern Atlantic are described on the base of oceanographic data collected from four late austral winters (1978-1980-1994-1995). The upper 500 meters regime along the shelf break and around Malvinas Islands (48° to 55° S) is analyzed. In particular, the 1994 horizontal distribution of temperature, salinity and density was mapped in order to show the extreme winter pattern of these parameters. Three salinity sections crossing the water flow direction in the Malvinas Channel (South to the islands) were selected to describe the vertical stratification 1995 and 1995. Horizontal and vertical distribution of chlorophyll a from the 1995 cruise is presented as reference data,...
Tipo: Journal Contribution
Palavras-chave: Shelf edge; Continental slope; Salinity; Temperature; Chlorophylls; Water circulation; Water circulation; Chlorophylls; Salinity; Temperature; Http://aims.fao.org/aos/agrovoc/c_8314; Http://aims.fao.org/aos/agrovoc/c_1577; Http://aims.fao.org/aos/agrovoc/c_6751; Http://aims.fao.org/aos/agrovoc/c_7657.
Ano: 1999
URL: http://hdl.handle.net/1834/2575

Temperatur-Toleranz tropischer Meeresalgen und mariner Phanerogamen
Provedor de dados: 20
Autores: Hammer, L.
Se estudió la influencia de temperaturas elevadas y disminuidas, en algunas especies de algas y dos especies de fanerógamas marinas tropicales, de la costa colombiana. Como control de tolerancia se midieron fotosíntesis y respiración a temperatura ambiente (25°C), luego de haber sometido el material vegetal durante 12 horas a la temperatura cambiada. Para todas las algas investigadas se encontró el límite de resistencia de temperaturas entre 34° y 36°C. Ninguna de las algas toleró la temperatura de 38°C. El límite de la tolerancia de temperaturas para las fanerógamas Thalassia testudinum y halophila decipiens está entre 32,5 y 34°C. En general, el aparato fotosintético resultó menos resistente al elevar la temperatura que el sistema respiratorio. La...
Tipo: Journal Contribution
Palavras-chave: Temperature; Seaweeds; Temperature; Seaweeds; Http://aims.fao.org/aos/agrovoc/c_7657; Http://aims.fao.org/aos/agrovoc/c_14154.
Ano: 1972
URL: http://hdl.handle.net/1834/3288

Altas temperaturas estacionales del agua como condición disturbadora de las macroalgas del Parque Nacional Tairona, Caribe colombiano: una hipotesis
Provedor de dados: 20
Autores: Bula-Meyer, G.
Con base en observaciones de campo y en mediciones de los factores temperatura, salinidad, nutrientes, transparencia y movimiento del agua, se analizó cada uno de éstos con el fin de conocer el factor más importante en el control del crecimiento y productividad de las macroalgas del Parque Nacional Tairona en la costa Caribe de Colombia. Se hipotetiza que el factor clave que regula estos aspectos fisiológicos de las macroalgas del Parquees la temperatura. Su ascenso por encima de los 26°C, como resultado de la declinación del afloramiento y de otros fenómenos oceanográficos-meteorológicos, produce la disturbancia (remoción de biomasa) de las macroalgas que se observa anualmente en la estación húmeda mayor.
Tipo: Journal Contribution
Palavras-chave: Temperature; Salinity; Nutrients (mineral); Temperature; Salinity; Http://aims.fao.org/aos/agrovoc/c_7657; Http://aims.fao.org/aos/agrovoc/c_6751.
Ano: 1990
URL: http://hdl.handle.net/1834/3882

La chaîne de froid en amont de la filière pêche artisanale au Sénégal: état des lieux et mise à niveau
Provedor de dados: 20
Autores: Sarr, S. L.
La présente étude porte sur l’état des lieux et la mise à niveau de la chaîne de froid en Amont de la filière pêche artisanale au Sénégal, notamment dans les régions de Thiès et de Dakar. L’objectif de cette étude est d’une part, de faire l’état des lieux des infrastructures de froid dans les pirogues, les quais pilotes de débarquement, les véhicules de transport et le Marché Central au Poisson de Dakar, d’autre part de formuler un programme de mise à niveau visant à solutionner les insuffisances constatées lors de la dernière mission en 2007 de l’Office Vétérinaire Alimentaire. Le contexte actuel montre que malgré les multiples efforts de mise en place d’ une chaine de froid au niveau de la filière de pêche artisanale avec l’avènement de pirogues...
Tipo: Theses and Dissertations
Palavras-chave: Artisanal fishing; Freezing storage; Temperature; Transport; Transport; Temperature; Http://aims.fao.org/aos/agrovoc/c_7874; Http://aims.fao.org/aos/agrovoc/c_7657.
Ano: 2009
URL: http://hdl.handle.net/1834/4071

Combined Effects of Temperature and Salinity on Larval Development of the Mangrove Crab Parasesarma catenata Ortman, 1897 (Brachyura: Sesarmidae)
Provedor de dados: 20
Autores: Mwaluma, J.; Nogueira Mendes, R.; Raedig, C.; Emmerson, W.; Paula, J.
The larval stages of the mangrove crab Parasesarma catenata were reared in the laboratory from eggs of females collected in the Mgazana estuary, South Africa. Survival and duration of larval stages were tested for the combined effects of temperature and salinity in a factorial design experiment, using three females each with two replicates of 15 larvae per combination. Combinations were made from five temperature (15, 20, 25, 30 and 35 ºC) and four salinity values (15, 25, 35 and 45 ‰). Results were tested by ANOVA and multiple regression was applied to generate contour models by polynomial equation. It was found that P. catenata larvae develop optimally in near to seawater salinity at a temperature of around 25 ºC. These results support the assumption...
Tipo: Journal Contribution
Palavras-chave: Mangroves; Crab culture; Salinity; Temperature.
Ano: 2003
URL: http://hdl.handle.net/1834/956

Conservación de un queso tipo crema de alta humedad a partir de leche de búfala
Provedor de dados: 20
Autores: Iñiguez, C.; Cardoso, F.; Suárez-Solíz, V.
El objetivo del presente trabajo fue definir la vida útil de un queso tipo crema de alta humedad a partir de leche entera de búfala envasado en potes de polipropileno de 200 mL y conservado a la temperatura de 4 ºC. Para definir la durabilidad del producto se tomaron como criterio de rechazo, la evaluación sensorial y la calidad higiénica- sanitaria, como variables de control fueron consideradas el desarrollo de acidez y valor del pH. La estimación de la durabilidad se efectuó por el método gráfico para datos incompletos de fallo utilizando la distribución de Weibull. Se concluyó que alteraciones detectadas por los evaluadores en el olor y sabor resultaron la primera causa de deterioro. La vida útil del producto fue de 12 días.
Tipo: Journal Contribution
Palavras-chave: Shelf life; Refrigeration; Temperature; Cream cheese; Buffalo milk.
Ano: 2008
URL: http://hdl.handle.net/1834/5008

Comportamiento del perfil de textura del queso cubano patagrás con diferentes tamaños y condiciones de maduración
Provedor de dados: 20
Autores: Hernández, A.; de Hombre, R.; Díaz, J. A.
Este trabajo tuvo como objetivo determinar el comportamiento del perfil de textura en el queso cubano Patagrás durante su maduración y la influencia que ejercen su tamaño y la temperatura de maduración en dichas propiedades. Se utilizaron quesos de forma cilíndrica de 4 y 10 kg de peso. Los quesos se maduraron a 10 ± 1 ºC y 14 ± 1 ºC y se tomaron muestras a los 30, 60 y 90 días de maduración, para analizar el perfil de textura con el texturómetro INSTRON. Se concluyó que durante la maduración del queso aumentan la dureza y la fragilidad, mientras que disminuyen la elasticidad y la cohesividad. Para los quesos de 10 kg no se recomienda realizar el proceso a la temperatura de maduración de 10 ± 1 ºC, ya que sus propiedades texturales no alcanzan valores...
Tipo: Journal Contribution
Palavras-chave: Temperature; Textural soil types; Ripening.
Ano: 2008
URL: http://hdl.handle.net/1834/4875

Condiciones hidrometeorológicas en la porción central del golfo de Ana  María, Cuba
Provedor de dados: 20
Autores: Matos Pupo, F.; Batista Tamayo, L. M.; Sánchez Hernández, A.
El golfo de Ana María constituye una zona con grandes reservas naturales y de condiciones climáticas muy específicas, que la  ubica como favorable para explotar por dos sectores económicos de importancia nacional: la pesca y el turismo; el que cobra  mayor auge en los últimos años. Se realizó una evaluación de las condiciones hidrometeorológicas en su porción central,  determinándose en diecisiete puntos de muestreo durante octubre de 2011, el comportamiento de cinco elementos  meteorológicos: nubosidad, dirección y velocidad del viento,  temperatura y fenómenos atmosféricos. Todas las mediciones y  observaciones fueron realizadas por medio de una metodología elaborada previamente, aplicable a zonas alejadas del alcance  máximo de las estaciones de...
Tipo: Journal Contribution
Palavras-chave: Atmospheric conditions; Meteorological data; Environmental monitoring; Temperature; Wind; Cloudiness.
Ano: 2012
URL: http://hdl.handle.net/1834/4635

Conservación de una bebida saborizada de leche de soya parcialmente hidrolizada
Provedor de dados: 20
Autores: Ruiz, A.; Mejías, E.; Silveira, I.; Lafargue, D.
Se realizó un estudio de conservación de una bebida saborizada de leche de soya parcialmente hidrolizada. Se incluyeron bebidas de tres sabores: cocoa (CHC), sabor chocolate en polvo (CHP) y sabor café en polvo (SCP) en versiones endulzadas con azúcar o con una mezcla de aspartame y acesulfame (ASPACE). Estas se envasaron en potes de poliestireno de 100 mL con tapa. Se probó la conservación a 4 y a 10 ºC. En el primer caso se tomaron muestras a los 0, 7, 14 y 21 días y en el segundo a los 0, 5, 8 y 12 días. Fueron variables de respuesta el análisis sensorial, global y por los atributos de olor, sabor y textura; la acidez y la calidad microbiológica mediante determinación de aerobios totales, mohos, levaduras y E. coli. Resultó que a 4 ºC las bebidas con...
Tipo: Journal Contribution
Palavras-chave: Conservation; Temperature; Soy milk; Refrigeration.
Ano: 2008
URL: http://hdl.handle.net/1834/5007

The GTSPP Project: Overview and Options for the Future
Provedor de dados: 20
Autores: Keeley, R.
The Global Temperature-Salinity Profile Programme (GTSPP) is a joint programme of the IOC Committee on International Oceanographic Data and Information Exchange (IODE) and the Joint IOC/WMO Committee on the Integrated Global Ocean Services System (IGOSS). IODE and IGOSS are technical committees of the Intergovernmental Oceanographic Commission (IOC) and the World Meteorological Organization (WMO). Development of the GTSPP (then called the Global Temperature-Salinity Pilot Project) began in 1989. The short-term goal of the GTSPP was to respond to the needs of the Tropical Ocean and Global Atmosphere (TOGA) Experiment and the World Ocean Circulation Experiment (WOCE) for temperature and salinity data. The longer-term goal was to develop and implement an...
Tipo: Report
Palavras-chave: Temperature; Salinity; Oceanography.
Ano: 2000
URL: http://hdl.handle.net/1834/1806

Project report: Global Temperature and Salinity Profile Programme (GTSPP)
Provedor de dados: 20
Autores: Keeley, R.
The Global Temperature Salinity Profile Project continues to deal in greater volumes of data. The project began in 1990, with the goal of collecting and archiving all profile data from the oceans and providing the highest quality and resolution to users as soon as possible after collection. The last annual report prepared was for 2004. Since then, other work pressures have prevented completion of the report for 2005.
Tipo: Conference Material
Palavras-chave: Temperature; Salinity profiles; Programmes; Temperature; Http://aims.fao.org/aos/agrovoc/c_7657.
Ano: 2007
URL: http://hdl.handle.net/1834/2818

Estimación de los flujos mar-atmósfera de CO2 y la variabilidad de la clorofila-a en el Mar Argentino.
Provedor de dados: 20
Autores: Luz Clara, M.
En ocho campañas oceanográficas realizadas entre los años 2000 y 2006 en el Mar Patagónico se obtuvieron datos superficiales de temperatura y salinidad, presiones parciales de CO2 (pCO2) en el mar y la atmósfera, fluorescencia (utilizada como indicador de biomasa fitoplanctónica), clorofila-a (Cl-a) y vientos, entre otros. La magnitud y dirección del flujo de CO2 se encuentran gobernadas por la diferencia entre las pCO2 de la superficie del mar y del aire (?pCO2), la solubilidad del gas y la velocidad del viento. Los flujos mar-atmósfera de CO2 conforman una parte esencial en el ciclo global del carbono. En este trabajo se realiza una comparación entre los flujos de CO2 y la intensidad del viento con datos in-situ y satelitales. Los flujos se calculan...
Tipo: Theses and Dissertations
Palavras-chave: Oceanographic surveys; Salinity; Temperature; Chlorophylls; Air-sea interaction; Oceanic fronts; Climatology.
Ano: 2008
URL: http://hdl.handle.net/1834/4207

Variación interanual del mesozooplancton en la plataforma bonaerense en primavera: introducción de nuevas metodologías para su análisis
Provedor de dados: 20
Autores: Di Mauro, R.
The distribution and abundance of mesozooplankton (specially copepod, cladoceran and appendicularian species) of the Buenos Aires shelf obtained in spring, during the years 2002, 2003 and 2004, were analysed. A small bongo net provided with 67 and 220 µm meshes, was employed in order to obtain a complete representation of the size spectrum of the mesozooplankton. The analysis included both the traditional optical method and the a new automatic image analysis (ZooImage). The results were related with the oceanographic conditions, which were, in general similar to the mean conditions for the study area. The finer mesh (67 µm) allowed a more accurate estimation of the abundance and biomass of small copepod species ( 1mm total length), producing the tick mesh...
Tipo: Theses and Dissertations
Palavras-chave: Zooplankton; Abundance; Biomass; Annual variations; Fish larvae; Imaging techniques; Oceanographic data; Environmental conditions; Salinity; Temperature; Water masses.
Ano: 2011
URL: http://hdl.handle.net/1834/4204

Características químicas de las masas de aguas costeras ecuatorianas durante los eventos ENSO de 1993-1998
Provedor de dados: 20
Autores: de Morán, A.R.; Valencia, M.; de Ordóñez, C.P.
El objetivo del presente es coadyuvar al conocimiento de la génesis y evolución del evento El Niño mediante la determinación de las características hidroquímicas de las masas de agua presentes en los eventos de 1993, considerado de moderada intensidad, de 1998, de gran intensidad; comparándolas con 1994, año considerado normal, utilizando para ello la información obtenida en cruceros del B/ORION realizados en los meses de Marzo de los años citados y tomando como área de estudio, por su coincidencia espacio-temporal las transectas comprendidas entre los meriadianos 82 y 83°30' de longitud oeste.
Tipo: Journal Contribution
Palavras-chave: Chemical oceanography; Water masses; Nutrients (mineral); Temperature; Dissolved oxygen; El Nino phenomena; Dissolved oxygen; Chemical oceanography; Temperature.
Ano: 1998
URL: http://hdl.handle.net/1834/2551

Investigation on possible chemical pollution of the BouGhraa lagoon south of Tunisia by chemical wastes
Provedor de dados: 20
Autores: Farhat, F.; Ben Aoun, Z.; Chouba, L.; Hadj Ali, M. S.
La mer de BouGhrara, un milieu quasi-lagunaire de cinquante milles hectares environ, a contribué d’une manière remarquable à la production halieutique Tunisienne jusqu’au 1992  4.786 tonnes, année à partir de laquelle cette production n’a cessé de décroître (1.118 tonnes en 2002). Par ailleurs le premier projet industriel d’aquaculture marine y a également vu le jour, atteignant une production aquacole en cages flottantes de 252 tonnes en 1990. Malheureusement cette activité a cessé en 1995, après une dizaine d’années et la société  qui assurait cette production a cessé ses activités et les quelques cages ont été déplacées de la lagune vers le bassin du port de Zarzis à la recherche de conditions environnementales meilleures. Plusieurs raisons ont été...
Tipo: Journal Contribution
Palavras-chave: Chemical pollution; Depletion; Eutrophication; Lagoon fisheries; Organic matter; Pollution effects; Salinity; Temperature; Waste disposal; Acidity.
Ano: 2007
URL: http://hdl.handle.net/1834/4249

Interrelaciones entre salinidad y temperatura en la Bahía de Santa Marta
Provedor de dados: 20
Autores: Müller, K.
La salinidad y la temperatura en la bahía de Santa Marta se ven afectadas, durante una época del año, por los vientos alisios que entran a la bahía en dirección oeste y que influyen en la distribución de las capas de agua de la superficie y el fondo. El agua es además afectada en la época de lluvias por el Río Manzanares que desemboca en esta bahía.
Tipo: Journal Contribution
Palavras-chave: Oceanography; Temperature; Salinity; Oceanography; Temperature; Salinity; Http://aims.fao.org/aos/agrovoc/c_12889; Http://aims.fao.org/aos/agrovoc/c_7657; Http://aims.fao.org/aos/agrovoc/c_6751.
Ano: 1979
URL: http://hdl.handle.net/1834/3954

Variaciones interanuales (1995-2000) de la temperatura y la salinidad registradas en los meses de enero en el golfo San Jorge y aguas adyacentes (43°S-47°S).
Provedor de dados: 20
Autores: Louge, E.; Reta, R.; Santos, B.A.; Hernandez, D.R.
Temperature and salinity interannual variations are analyzed south ofthe hake (Merluccius hubbsi)spawning grounds area, in the San Jorge Gulf and adjacent waters Argentine Sea, SW Atlantic. The study period comprises the months of January 1995-2000. Results of cruises carried out on board of INIDEP research vessels to assess hake juveniles were studied. Statistically significant increase of temperature from 1997 was observed. Change trends over a period of 20 years at a global climate scale are discussed. Mean salinity did not show variations except for 2000 when it was slightly higher probably due to the scarce influence of the Patagonian Current in the area. Temperature and salinity fields showed a horizontal gradient south of the Gulf (thermohaline...
Tipo: Journal Contribution
Palavras-chave: Salinity; Temperature; Shelf fronts; Thermocline; Environmental factors; Nursery grounds; Climatic changes; Environmental factors; Salinity; Temperature; Nursery grounds; Http://aims.fao.org/aos/agrovoc/c_2594; Http://aims.fao.org/aos/agrovoc/c_6751; Http://aims.fao.org/aos/agrovoc/c_7657; Http://aims.fao.org/aos/agrovoc/c_25438.
Ano: 2004
URL: http://hdl.handle.net/1834/1500

The selection of spawning location of sardine (Sardinops sagax) in the northern Benguela after changes in stock structure and environmental conditions
Provedor de dados: 20
Autores: Kreiner, Anja; Yemane, Dawit; Stenevik, Erling K.; Moroff, Nadine E.
Most reports on the distribution of spawning areas of sardine (Sardinops sagax) in the northern Benguela originate from the 1970s and 1980s. The northern Benguela system was in a high upwelling regime during those decades. Since the early 1990s upwelling favourable winds have decreased and a trend of increasing sea surface temperature (SST) has been observed. Changes in the structure of sardine stock in the northern Benguela have been observed and it has been suggested that a reduced biomass and changes in stock structure has led to decreased spawning in the favourable southern locations, thus preventing a recovery of the sardine stock. The present paper on the contrary shows that there has been a shift in spawning location from the less favourable...
Tipo: Journal Contribution
Palavras-chave: Coastal upwelling; Upwelling system; Temperature; Spawning; Seasonal changes.
Ano: 2011
URL: http://hdl.handle.net/1834/4625

Un système d'indicateurs de durabilité des pêcheries côtières comme outil de gestion intégrée des ressources halieutiques sénégalaises
Provedor de dados: 20
Autores: Thiao, Djiga.
Cette thèse est axée sur une analyse de la durabilité des pêcheries côtières qui aboutit  sur la proposition d’un système d’indicateurs comme  outil de gestion intégrée des ressources halieutiques sénégalaises.  L’objectif est d’encourager  une meilleure gouvernance de ces  systèmes halieutiques et côtiers dont l’exploitation est caractérisée par la complexité, la multiplicité et l’interactivité de plusieurs facteurs écologiques, économiques et sociaux. La stratégie adoptée est fondée sur l’approche systémique à travers  une vision multidimensionnelle et multi-acteurs  s’appuyant  sur le modèle PER (pression-état-réponse).  Le diagnostic  reflète  une détérioration générale de l’état  des écosystèmes côtiers  nécessitant  des mesures d’ajustement de la...
Tipo: Theses and Dissertations
Palavras-chave: Sustainable fishing; Inshore waters; Coastal zone management; Fisheries resources; Ecosystem management; Hydrology; Phytoplankton; Flora; Coastal environment; Sustainable development; Zooplankton; Ecology; Temperature; Salinity; Tourism; Rivers; Upwelling.
Ano: 2009
URL: http://hdl.handle.net/1834/5002

Temperaturas letales y temperatura óptima para crecimiento en una población de almeja mano de león (Nodipecten subnodosus Sowerby, 1835)
Provedor de dados: 20
Autores: González, F.
En el presente estudio se establecieron los intervalos de resistencia y tolerancia térmica, así como la temperatura óptima para el crecimiento de la almeja mano de león (Nodipecten subnodosus). Juveniles de 7.29 + 0.42 mm de altura, fueron aclimatados a diferentes temperaturas (15, 18, 22, 26 y 30˚C) y alimentados con una mezcla 1:1 de Isochrysis galbana y Chaetoceros calcitrans a una concentración de 12x106 cél/org/día. Posteriormente se estimó la temperatura letal media superior (TLMs) e inferior (TLMi) a través del método de TLM96 de Rand y Petrocelli (1985), y la temperatura letal incipiente superior (TLIs) e inferior (TLIi) incrementado o disminuyendo la temperatura 1 °C/día a partir de las temperaturas de aclimatación, hasta alcanzar el 100% de...
Tipo: Theses and Dissertations
Palavras-chave: 958; Marine molluscs; Temperature; Animal growth; Temperature; Http://aims.fao.org/aos/agrovoc/c_7657.
Ano: 2003
URL: http://hdl.handle.net/1834/3425

Evolution du pH et de la température au cours de la transformation artisanale du cymbium (voluté). Essai sur les perspectives de valorisation du produit transformé
Provedor de dados: 20
Autores: Diouf, A.
L’étude porte sur l’évolution du pH et de la température au cours de la transformation artisanale du Cymbium, ainsi que sur les perspectives de valorisation du produit transformé. Les expérimentations menées au site de transformation artisanale de Joal ont permis de constater que :   Après 12 heures de séjour en bac (1ère nuit), le Cymbium est encore en phase de rigor mortis. Le pH moyen affiché à l’issue de cette première nuit est de 7,6 ; donc proche de celui du mollusque vivant ;   Le pH moyen du produit fini est légèrement acide et se situe entre 6,3 et 6,4. Donc le yeet de Joal est très peu fermenté ;   Les difficultés de séchage notées sont dues : soit au manque de maîtrise des paramètres tels que, la température, l’humidité relative et la vitesse de...
Tipo: Theses and Dissertations
Palavras-chave: Processing fishery products; Fermentation; Biology; Marketing; Drying; Temperature; Statistics; Ph; Marketing; Biology; Fermentation; Drying; Temperature.
Ano: 2008
URL: http://hdl.handle.net/1834/3007

Presencia de Limnoria sp., perforador marino de maderas en los principales puertos del Ecuador (Crustacea: Isopoda: Flabellifera)
Provedor de dados: 20
Autores: Torres, G.
El propósito de estas investigaciones, es contribuir al conocimiento sobre la presencia de Limnorias en los principales puertos del Ecuador, además evaluar el daño que ocasionan.
Tipo: Journal Contribution
Palavras-chave: Marine molluscs; Marine organisms; Geographical distribution; Oceanographic data; Environmental factors; Salinity; Temperature; Geographical distribution; Environmental factors; Salinity; Temperature; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_2594; Http://aims.fao.org/aos/agrovoc/c_6751; Http://aims.fao.org/aos/agrovoc/c_7657.
Ano: 1990
URL: http://hdl.handle.net/1834/2171

Parámetros de conservación del tofu proteolizado fermentado
Provedor de dados: 20
Autores: Mejías, E.; Ruíz, A.; Silveira, I.; Padrón, X.; Lafargue, D.; Fajo, A.
Se determinaron las condiciones y parámetros de conservación del tofu proteolizado fermentado por un período no mayor de 15 días. Se obtuvo el tofu a partir de leche de soya parcialmente proteolizada con papaína grado alimentario a la cual se le añadió sales de calcio y de magnesio. El tofu proteolizado se envasó en potes de poliestireno que se inocularon con un cultivo láctico y se incubaron a 23 ± 1 ºC. Se ensayó el empleo del sorbato de potasio y la pasteurización del tofu proteolizado, una vez finalizada la fermentación. Los productos se colocaron a 4 y 10 ºC por 15 días y se analizaron química, microbiológica y sensorialmente. El tofu proteolizado fermentado se puede conservar en potes de poliestireno de 100 mL con tapa a una temperatura de 4 ºC por...
Tipo: Journal Contribution
Palavras-chave: Conservation; Analysis; Temperature; Tofu; Fermentation; Proteolysis; Cold storage.
Ano: 2008
URL: http://hdl.handle.net/1834/4888

GTSPP real-time quality control manual
Provedor de dados: 20
This manual has been produced within the context of the Global Temperature Salinity Pilot Project (GTSPP). Because of the work of assuring the quality of data handled by the Project is shared amongst data centres, it is important to have both consistent and well documented procedures. This manual describes the means by which data quality is assessed and the actions taken as a result of the procedures.
Tipo: Report
Palavras-chave: Temperature; Salinity.
Ano: 1990
URL: http://hdl.handle.net/1834/4331

Rate of transmission of Indian peanut clump virus to groundnut by mechanical inoculation
Provedor de dados: 30
Autores: Reddy, A.S.
Palavras-chave: Groundnuts; ELISA; Genotypes; Poultry equipment; Application methods; Temperature; Germplasm; Barley; Inorganic acid salts; Potassium.
Ano: 2005
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3224

Survival of groundnut seeds under different storage conditions
Provedor de dados: 30
Autores: Sastry, D.V.S.S.R.
Palavras-chave: Seed viability; Seed longevity; Seed testing; Seed storage; Groundnuts; Sampling; Silica; Storage; Germplasm; Temperature.
Ano: 2007
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3356

Influence of seed size in chickpea on moisture content during seed drying
Provedor de dados: 30
Autores: Sastry, D.V.S.S.R.
Palavras-chave: Seed viability; Chickpeas; Sampling; Seed testing; Seed treatment; Germplasm; Animal developmental stages; Replication; Environment; Temperature.
Ano: 2007
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3289

Improving Vegetable Productivity in a Variable and Changing Climate
Provedor de dados: 30
Autores: de la Peña,R.
Palavras-chave: Tolerance; Genes; Climatic change; Grafting; Rootstocks; Drought stress; Vegetable products; Trickle irrigation; Genomes; Temperature.
Ano: 2007
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3331

Facility for Growing Plants in Test Tubes at ICRISAT
Provedor de dados: 30
Autores: O.P.
Palavras-chave: Rhizobium; Chickpeas; Pigeonpeas; Root nodulation; Temperature; Nitrogen fixation; Polymers; Iron; Tropical zones; Quality.
Ano: 1984
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/4025

Agroclimatology of West Africa: Burkina Faso
Provedor de dados: 30
Autores: M.V.K.
Palavras-chave: Land management; Water balance; Agroclimatology; Evapotranspiration; Climate; Wet season; Temperature; Atmospheric disturbances; Runoff; Climatic zones.
Ano: 1987
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/4043

Cold-tolerant Chickpea Varieties ICCV 88503, ICCV 88506, ICCV 88510
Provedor de dados: 30
Palavras-chave: Tolerance; Chickpeas; Temperature; Double cropping; Genotypes; Sowing date; Segregation; Grain legumes; Breeds (animals); Cropping systems.
Ano: 1994
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3858

Genetic variability for cold tolerance in pigeonpea
Provedor de dados: 30
Autores: Sandhu,J.S.
Palavras-chave: Pigeonpeas; Genotypes; Tolerance; Genetic variation; Temperature; Chickpeas; Germplasm; Genetic resources; Genetics; Freezing.
Ano: 2007
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3340

A room temperature procedure for the manual determination of urea in seawater
Provedor de dados: 27
Autores: Goeyens, L.; Kindermans, N.; Yusuf, M.A.; Elskens, M.
Several earlier studies underpin the important role of dissolved organic matter and more particularly urea in phytoplanktonic nitrogen uptake fluxes. Generally, the determination of urea concentrations relies on the formation of an imidazolone-thiosemicarbizide complex, a complexation which requires very accurate temperature control when carried out at high temperature. It is also possible, however, to obtain reliable results with a room temperature procedure. The measured abundances for both complexation at high temperature (85 degree C, 20 min) and at ambient temperature (22 degree C, 72 h) are closely comparable. Lower values are observed for temperatures &lt;10 degree C though. Moreover, a comparison of both techniques reveals similar precision...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dissolved organic carbon; Sea water; Temperature; Urea; Water analysis.
Ano: 1998
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=7858

A model of nematode dynamics in the Westerschelde Estuary
Provedor de dados: 27
Autores: Li, J.; Vincx, M.; Herman, P.M.J.
We developed a time dynamic model to investigate the temporal dynamics of nematode community in the brackish zone of the Westerschelde Estuary. The biomass of four nematode feeding groups observed from March 1991 to February 1992 is used to calibrate the model. Using environmental data as the input, the model predicts the temporal modification and interrelation of four nematode feeding groups. Nematodes achieve a dominant position in the community because of their lower loss rate (in respiration, excretion and natural death). Predators which are deposit-feeding macrobenthos control the variations of dominant nematodes, such as omnivores and non-selective deposit feeders. Food availability causes modification only for rare nematodes such as epigrowth...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diatoms; Ecology; Food; Light; Marine nematodes; Meiobenthos; Population dynamics; Predation; Respiration; Temperature; Nematoda [Nematodes].
Ano: 1996
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=7284

Dendrochronology of species from Brazilian Araucaria Forest, Candoi, PR
Provedor de dados: 190
Autores: Mattos, Patricia Póvoa de; Santos, Andreia Taborda dos; Oliveira, Yeda Maria Malheiros de; Rosot, Maria Augusta Doetzer.
In the present work the dendrochronological potential of six species of the Araucaria Forest is analyzed. The trunks of 20 trees were collected in Candoi, State of Parana, Brazil, from an area that belongs toELEJOR, Centrais Elétricas do Rio Jordão, for the following species: Araucaria angustifolia, Clethra scabra, Cedrela lilloi, Ocotea porosa, Podocarpus lambertii and Sebastiania commersoniana (3 to 6, from each species). The trunks were sawed, and at breast height a sample was taken from the center of the board, from bark to bark, crossing the pith, for macroscopic analysis. These samples were dried and polished, making possible the recognition and measurement of growth rings The historical climatic data series were provided by SIMEPAR, the State...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Growth rings; Precipitation; Temperature; Forest dynamics; Atlantic Rain Forest Anéis de crescimento; Precipitação pluviométrica; Temperatura; Dinâmica de florestas; Mata Atlântica.
Ano: 2010
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/141

Morphological characterization and germination of seeds of Casearia decandra
Provedor de dados: 190
Autores: Haliski, Sérgio Luis; Cosmo, Nelson Luiz; Gogosz, Alessandra Mara; Rego, Suelen Santos; Nogueira, Antonio Carlos; Saito Kuniyoshi, Yoshiko.
This study aimed at to characterize morphologically the fruits, seeds and seedling development of Casearia decandra and examine the best substrate and temperature for seed germination. The fruits were collected from 13 mothers in the municipality of Irati, Parana State, Brazil. Tests were conducted to determine the weight of 1,000 seeds, number of seeds per kilogram and the seeds moisture content. To test the influence of different substrate and temperature on germination it was tested four temperatures: 20 ºC, 25 ºC, 30 ºC and 35 ºC on four substrates: sand, paper towels, roll paper and vermiculite. The fruit is spherical, with dry pericarp, thin, with glabrous , smooth, and light yellow surface. The seed presents ellipsoid shape, chartaceous, creamy and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Salicaceae; Temperature; Substrate; Forest Recursos Florestais; Engenharia Florestal; Sementes Florestais; Morfologia Vegetal Salicaceae; Temperatura; Substrato; Florestal.
Ano: 2013
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/451

Leaf gas exchange differences between males and females of yerba-mate
Provedor de dados: 190
Autores: Rakocevic, Miroslava; Medrado, Moacir José Sales; Lavoranti, Osmir José.
A preliminary study was developed on leaf gas exchange properties of males and females in yerbamate (Ilex paraguariensis St. Hil.), planted in open growth conditions. The photosynthesic photon flux density (PPFD) on leaf level, stomatal conductance (gs), net photosynthesis (A), transpiration (E), and leaf temperature (Tl) was measured during the biennial production period: in the summer during the fruit ripening when there is a pause in its growth (January, February), spring  sprouting (November) and autumn sprouting (March, Jun). The measurements have been taken in different tree crown positions (inside, exterior and tips). First indications of sex physiological  dimorphism in yerba-mate have been shown.  Conductance was superior on female plants, with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Light; Photosynthesis; Stomatal conductance; Temperature; Transpiration Condutância estomática; Fotossíntese; Luz; Temperatura; Transpiração.
Ano: 2010
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/127

Growth and germination of some thermophilic fungi isolated from eucalypt wood chips
Provedor de dados: 190
Autores: Auer, Celso Garcia.
The main fungal species present in self-heated chip piles of eucalypt wood in Brazil were Aspergillusfumigatus, Chrysosporium thermophilum, Dactylomyces thermophilus, Penicillium bacillisporum, Rhizomucorpusillus and Thermoascus aurantiacus. This study determined the micelial growth and spore germination of these species at several temperatures on PDA medium ranging from 20 °C to 70 °C. Optimum growth temperatures were observed at 30 °C for A. fumigatus and P. bacillisporum; 40 °C for R. pusillus and 50 °C for D. thermophilus, C. thermophilum and T. aurantiacus. Growth was not observed at 60 °C and 70 °C. Incubation of spores on wateragar medium at 20 °C, 30 °C, 40 °C and 50 °C showed that only A. fumigatus, P. bacillisporum and R. pusillus could germinate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microorganism; Physiology; Temperature; Thermophilism Fisiologia; Microorganismos; Termofilia; Temperatura.
Ano: 2010
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/140

Plastochron index of 'Cabernet Sauvignon' and 'Chardonnay' grapevines in Fronteira Oeste, in the state of Rio Grande do Sul, Brazil
Provedor de dados: 86
Autores: Zeist,André Ricardo; Tomazetti,Tiago Camponogara; Rossarolla,Márcia Denise; Alberto,Cleber Maus; Giacobbo,Clevison Luiz; Welter,Leocir José.
Abstract: The objective of this work was to estimate the plastochron index of the 'Cabernet Sauvignon' and 'Chardonnay' grapevine varieties in Fronteira Oeste, in the state of Rio Grande do Sul, Brazil. The experiment was conducted in 2010, in a completely randomized design, using 'Cabernet Sauvignon' and 'Chardonnay' grapevines grown in the municipalities of Itaqui, São Borja, and Maçambará, which were referred to as sites 1, 2, and 3, respectively. Phenological monitoring of the varieties was done from the beginning of sprouting until the pruning of canes (green trimming). The daily thermal sum (dTS, oC day) was calculated using the cardinal temperatures for node appearance in grapevines (10, 25, and 35ºC), whereas the accumulated thermal sum (aTS, oC...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis vinifera; Degree-days; Plant development; Temperature; Thermal sum; Viticulture.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017000400244

Biological parameters and thermal requirements of Trichogramma pretiosum reared on Helicoverpa armigera eggs
Provedor de dados: 86
Autores: Carvalho,Gabriel dos Santos; Silva,Luciana Barboza; Reis,Soislan Sousa; Veras,Maisa Sousa; Carneiro,Eliane; Almeida,Mayra Layra dos Santos; Silva,Alexandre Faria da; Lopes,Gleidyane Novais.
Abstract: The objective of this work was to determine the biological parameters and thermal requirements of Trichogramma pretiosum TM strain reared on Helicoverpa armigera eggs. A card containing 20 eggs of H. armigera was offered for each T. pretiosum female, at temperatures of 18, 20, 22, 25, 28, 30 and 32°C. All life stages of T. pretiosum were observed under the given temperature conditions. The optimum temperature for the parasitism of T. pretiosum was 25°C, and the highest longevity was found at the same temperature. The highest parasitoid emergence rates occurred at temperatures of 22, 25 and 28°C. The highest proportion of T. pretiosum individuals emerged per egg was observed at 18°C. Concerning the sex ratio, the highest proportion of females...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trichogrammatidae; Biological control; Parasitoid; Temperature.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017001100961

Stability of soybean yield through different sowing periods
Provedor de dados: 86
Autores: LIMA,WILMAR FERREIRA; TOLEDO,JOSÉ FRANCISCO FERRAZ DE; ARIAS,CARLOS ALBERTO ARRABAL; OLIVEIRA,MARCELO FERNANDES DE.
Soybean yield is highly affected by sowing period and there are significant productivity losses when sowings are done outward a relatively restricted period in many regions of Brazil. Breeding cultivars less sensitive to photoperiod and to temperature variations is desirable for adaptation to wider sowing period and wider latitude range and also make irrigated soybean cultivation possible during the fall-winter seasons in frost free regions. The possibility of selecting high yielding and stable lines for yield during various sowing periods was studied by analyzing the behavior of 100 non-selected advanced lines (F9 and F10), from each one of all possible biparental crosses involving the genotypes BR85-29009, OCEPAR 8, FT-2, and BR-13. Experiments were set...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Cultivars; Genotypes; Progeny; Photoperiodicity; Temperature; Yields; Productivity.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2000001100009

Photosynthetic responses of young cashew plants to varying environmental conditions
Provedor de dados: 86
Autores: Souza,Rogéria Pereira de; Ribeiro,Rafael Vasconcelos; Machado,Eduardo Caruso; Oliveira,Ricardo Ferraz de; Silveira,Joaquim Albenísio Gomes da.
The aim of this study was to characterize gas exchange responses of young cashew plants to varying photosynthetic photon flux density (PPFD), temperature, vapor-pressure deficit (VPD), and intercellular CO2 concentration (Ci), under controlled conditions. Daily courses of gas exchange and chlorophyll a fluorescence parameters were measured under natural conditions. Maximum CO2 assimilation rates, under optimal controlled conditions, were about 13 mmol m-2 s-1 , with light saturation around 1,000 mmol m-2 s-1. Leaf temperatures between 25ºC and 35ºC were optimal for photosynthesis. Stomata showed sensitivity to CO2, and a closing response with increasing Ci. Increasing VPD had a small effect on CO2 assimilation rates, with a small decrease above 2.5 kPa....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anacardium occidentale; Gas exchange; Chlorophyll fluorescence; Temperature; Vapor-pressure deficit.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2005000800002

Whitefly, aphids and thrips attack on cabbage
Provedor de dados: 86
Autores: Leite,Germano Leão Demolin; Picanço,Marcelo; Jham,Gulab Newandram; Moreira,Márcio Dionízio.
The objective of this work was to investigate the relationships between predators and parasitoids, leaf chemical composition, levels of leaf nitrogen and potassium, total rainfall, relative humidity, daylight and median temperature on the intensity of whitefly, aphid, and thrips attack on cabbage. Whitefly, aphids and thrips population tended to proliferate in the final stage of plant or reached a peak population about 40 days after plantation. The whitefly and thrips tended to increase with an increase in the median temperature. A dependence of Cheiracanthium inclusum and Adialytus spp. populations on whitefly and aphids populations, respectively, was observed. No significant effect was detected between K and nonacosane leaf content and aphid population....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bemisia tabaci; Brevicoryne brassicae; Thrips tabaci; Brassica oleracea; Temperature; Nonacosane.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2006001000003

Shoot growth of Merlot and Cabernet Sauvignon grapevine varieties
Provedor de dados: 86
Autores: Borghezan,Marcelo; Gavioli,Olavo; Vieira,Hamilton Justino; Silva,Aparecido Lima da.
The objective of this work was to evaluate shoot growth of the grapevine varieties Merlot and Cabernet Sauvignon, during 2006/2007, and Cabernet Sauvignon, during 2008/2009, in São Joaquim, SC, Brazil. The experiment was carried out in a commercial vineyard trained on a vertical trellis system. The shoots of the central part of the plants were selected, and the lengths from the base to the apex of 20 shoots per cultivar were evaluated. In 2006/2007, monitoring began at pruning, on 9/15/2006, and ended on 2/6/2007, totalizing 144 days of evaluation. During the 2008/2009 cycle, phenology and shoot growth for 'Cabernet Sauvignon' were assessed from grape development (1/13/2009) (pea-sized grapes) until shoot vegetative growth had ceased. Budburst occurred in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis vinifera; Photoperiod; Temperature; Vegetative growth.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2012000200008

Whitefly population dynamics in okra plantations
Provedor de dados: 86
Autores: Leite,Germano Leão Demolin; Picanço,Marcelo; Jham,Gulab Newandram; Moreira,Márcio Dionízio.
The control of whitefly Bemisia tabaci (Gennadius) biotype B (Hemiptera: Aleyrodidae) on okra (Abelmoschus esculentus L.) consists primarily in the use of insecticides, due to the lack of information on other mortality factors. The objective of this study was to evaluate the spatial and temporal population dynamics of the whitefly B. tabaci biotype B on two successive A. esculentus var. "Santa Cruz" plantations. Leaf chemical composition, leaf nitrogen and potassium contents, trichome density, canopy height, plant age, predators, parasitoids, total rainfall and median temperature were evaluated and their relationships with whitefly on okra were determined. Monthly number estimates of whitefly adults, nymphs (visual inspection) and eggs (magnifying lens)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bemisia tabaci; Abelmoschus esculentus; Natural enemies; Plant phenology; Temperature.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2005000100003

Conservation of 'Pedro Sato' guavas under treatment with 1-methylcyclopropene
Provedor de dados: 86
Autores: Bassetto,Eliane; Jacomino,Angelo Pedro; Pinheiro,Ana Luiza.
The search for techniques that extend shelf life of guava (Psidium guajava) fruits, and reduce its postharvest losses is desirable. The objective of this work was to evaluate the effects of concentrations of competitive ethylene antagonist 1-methylcyclopropene (1-MCP) on conservation of 'Pedro Sato' guava fruits. Treatments consisted of 0, 100, 300 or 900 nL L-1 of 1-MCP for 3 hours followed by storage at 25ºC, and 10ºC with 90±5% RH. The application of 900 nL L-1 1-MCP for 3 hours was efficient in delaying loss of skin color, and in keeping fruit firmness at both storage temperatures. The 300 nL L-1 of 1-MCP concentration was efficient in delaying skin color loss only when fruits were stored at 10ºC. The effect of 1-MCP was quite significant on the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Psidium guajava; Temperature; Conservation; Postharvest.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2005000500002

Germination of grasses and shrubs under various water stress and temperature conditions: (With 4 Figures &amp;amp; 2 Tables)
Provedor de dados: 85
Autores: Bonvissuto,GL; Busso,CA.
The effects of various temperature combinations and water potentials were determined on the germination of Atriplex lampa Gill. ex Moquin, Larrea divaricata Cav., Leymus erianthus (Phil.) Dubcovsky, Stipa neaei Nees ex Steudel and Poa ligularis Nees ap. Steudel under controlled conditions. The tested hypothesis was that seed germination increases with increasing temperatures and water potentials in A. lampa, L. divaricata, L. erianthus, S. neaei and P. ligularis, and that time to reach 50% of total germination is greater at lower than higher water potentials. PEG 2000 was used to impose water stress conditions. In general, obtained results conducted to accept the posted hyphotesis.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water stress; Temperature; Germination index; Perennial grasses and shrubs; Arid Argentina.
Ano: 2007
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572007000100011

Comparative analysis of fatty acids, tocopherols and phytosterols content in sunflower cultivars (Helianthus annuus) from a three-year multi-local study
Provedor de dados: 85
Autores: Ayerdi Gotor,A; Berger,M; Labalette,F; Centis,S; Daydé,J; Calmon,A.
Sunflower oil is naturally rich in both unsaturated fatty acids and numerous minor components, with high levels ofa-tocopherol and phytosterols that could play an important role in plant protection. These micronutriments, tocopherols and phytosterols, also exhibit health benefits for humans including reducing both cardiovascular diseases and aging disorders. a&amp;#8722;Tocopherol represents more than 95% of total sunflower tocopherol and has the greatest vitaminic activity. Furthermore, this oil contains high amounts of &amp;#946;-sitosterol which is a promising health beneficial phytosterol. The objective of this study was to compare the content and composition of fatty acids, tocopherols and phytosterols in sunflower oil between different cultivars and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sunflower oil; Fatty acids; Tocopherols; Phytosterols; Genotype x environment interaction; Temperature.
Ano: 2015
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572015000100004

Light and temperature effects on seed germination of four native species of Mediterranean high mountains(Spain)
Provedor de dados: 85
Autores: Serrano-Bernardo,F; Rosúa,JL; Díaz-Miguel,M.
The Mediterranean region is considered one of the most important zones worldwide in terms of plant diversity. Sierra Nevada (S Spain) is a unique mountain massif within the high-mountain systems of the Mediterranean. It is of great floristic importance and very rich in endemic species. However, it requires numerous tasks for restoring plant cover due to the constant anthropic degradation, especially because of the ski station located near the second-highest peak of the mountain. One of the restoration efforts consists of trying to reproduce, in the laboratory, the ideal conditions to pre-germinate seeds of some of the species most threatened by these perturbations. This is to transplant the seedlings afterwards in the mountain, thereby contributing to the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Germination; Plant-cover restoration; Mediterranean high mountains; Sierra Nevada; Light; Temperature.
Ano: 2007
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572007000100003

Responses of Conocarpus lancifolius to environmental stress: a case study in the semi-arid land of Kuwait
Provedor de dados: 85
Autores: Redha,A; Suleman,P; Al-Hasan,R; Afzal,M.
Cococarpus lancifolius Engl. grows wild in Djibouti, Somalia and East Africa, and South Asia. The species was introduced into Kuwait, where it is exposed to several stresses: oil pollution, salinity, high temperature and harsh climatic conditions. These conditions are prevalent in its semi-arid environment. In this study, the impact of salinity (2, 6 and 10%), temperature (20, 30 and 40 °C), polyethylene glycol (10, 30 and 60%) and drought has been investigated on C. lancifolius. Proline (Pro) accumulation (5.5 ± 0.03 µg/g dry weight; p=0.05-0.005), protein (16.47 ± 0.052 mg/g; p=0.001), free amino acids (10.92 ± 0.082 mg/g; p=0.006) and lipids (116.05 ± 2.17 µg/g; p=0.05) were measured in plants irrigated with 60% polyethylene glycol (PEG) for 6 days....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conocarpus lancifolius; Drought; Electron transport rate; Environmental stress; Salinity; Temperature; Photosynthesis.
Ano: 2012
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572012000200008

EFFECTS OF ENVIRONMENTAL FACTORS ON SEED GERMINATION AND EMERGENCE OF GLYPHOSATE RESISTANT AND SUSCEPTIBLE SOURGRASS
Provedor de dados: 87
Autores: MARTINS,J.F.; BARROSO,A.A.M.; ALVES,P.L.C.A.
ABSTRACT Sourgrass is one of the most problematic weeds of Brazil. It is an aggressive species in the allocation of resources from the environment and reported to be glyphosate resistant in several states of the country. This work has aimed to verify environmental effects on seed germination and seedling emergence of sourgrass. Laboratory and field trials were conducted to determine the effects of temperature, light, photoperiod, water availability and depth of burial in germination and emergence of seeds. The maximum germination was greater than 80% for seed originated from resistant plants between 15 and 30 oC. For the susceptible ones, the maximum germination occurred only at 30 oC. Germination occurred for both biotypes independent of the presence of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Digitaria insularis; Water availability; Photoperiod; Seeds; Temperature.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100243

Influence of environmental factors on seed germination and seedling emergence of yellow sweet clover (Melilotus officinalis)
Provedor de dados: 87
Autores: Ghaderi-Far,F; Gherekhloo,J.; Alimagham,M.
Laboratory and greenhouse experiments were conducted to determine the effects of drought and salinity stress, temperature, pH and planting depth on yellow sweet clover (Melilotus officinalis) germination and emergence. Base, optimum and ceiling germination temperatures were estimated as 0, 18.47 and 34.60 ºC, respectively. Seed germination was sensitive to drought stress and completely inhibited at a potential of -1 MPa, but it was tolerant to salinity. Salinity stress up to 90 mM had no effect over the M. officinalis seed germination, but the germination decreased by increasing the salt concentration. The drought and salinity required for 50% inhibition of maximum germination were 207 mM and -0.49 MPa, respectively. High percentage of seed germination...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Germination; PH; Salinity stress; Soil depth; Temperature; Water stress.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582010000300002

Effects of Environmental Factors on Seed Germination and Emergence of Velvetleaf (Abutilon theophrasti)
Provedor de dados: 87
Autores: XIONG,RC.; MA,Y.; WU,HW.; JIANG,WL.; MA,XY.
ABSTRACT: Velvetleaf, an annual broadleaf weed, is a common and troublesome weed of cropping systems worldwide. Laboratory and field experiments were conducted to determine the effects of environmental factors on germination and emergence of velvetleaf. Seeds germinated over a range of constant temperatures from 10 to 40 oC regardless of light conditions, but no germination occurred at temperature below 5 oC and beyond 50 oC. Seeds germinated at alternating temperature regimes of 15/5 to 40/30 oC, with maximum germination (&gt;90%) at alternating temperatures of 40/30 oC. Germination was sensitive to water stress, and only 0.4% of the seeds germinated at the osmotic potential of -0.4 MPa. There was no germination at ? 0.6 MPa. Moreover, germination was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Burial depth; Light; Osmotic potential; Saline and alkaline stress; Temperature.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100321

Morphometry and Germination of Passovia pyrifolia, Struthanthus marginatus and Phoradendron mucronatum Diaspores
Provedor de dados: 87
Autores: AZEVEDO,J.M.L.; SANTOS,C.G.G.; CAIRES,C.S.; ARAÚJO NETO,J.C.; SOUZA,R.C.
ABSTRACT: The goal of this work was to characterize morphometrically diaspores from three species of mistletoes (Passovia pyrifolia, Struthanthus marginatus e Phoradendron mucronatum), as well as to study its germination behavior according to temperature and luminosity. In germination tests, the completely randomized design was used, in factor scheme 4 x 2, with 4 replications of 15 diaspores. The factors for the first test were different temperatures and two diaspore conditions (intact and without epicarp). In the second test, factors were different light qualities and two diaspore conditions. The analyzed variables were: germination percentage, germination rate index (GRI) and mean germination time (MGT). Mistletoe’s diaspores present an elliptic shape...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mistletoes; Temperature; Luminosity.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100218

Germination and emergence of trumpet flower (tecoma stans) under different environmental conditions
Provedor de dados: 87
Autores: Reis,F.C.; Medina Sotomayor,J.F.; Garcia,D.B.; Barroso,A.A.M.; Albrecht,A.J.P.; Filho,R.V.
The aim of this work was to analyze the effect of temperature and light intensity on trumpet flower seed germination, as well as the effect of seeding depth on its emergence. To study the influence of temperature, nine temperature intervals were evaluated, ranging from 15.0 to 40.0 ºC. A randomized block design experiment was used with five replications and 20 seeds per replication, and performed twice. To evaluate light intensity on seed germination, a randomized experimental design was used with eight replications and 25 seeds per replication. The treatments applied were: photoperiod with temperature alternation; photoperiod with constant temperature; darkness with temperature alternation; and darkness with constant temperature. The photoperiod consisted...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Temperature; Light; Photoperiod; Photoblastism.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582014000200005

Effect of Environmental Factors on Seed Germination and Early Seedling Emergence of Carolina geranium (Geranium carolinianum)
Provedor de dados: 87
Autores: LIU,X.; ZONG,T.; LI,Y.; ZHOU,X.; BAI,L.
ABSTRACT: Carolina geranium (Geranium carolinianum) is an emerging invasive weed in rape and wheat fields in China. A better understanding of its germination and emergence ecology will enable the development of integrated weed control strategies. In this study, we investigated the effects of temperature, photoperiod, soil water content, salinity, and burial depth, on germination and emergence of Carolina geranium. Germination percentages were over 74% under 15/20 and 20/25 oC night/day temperature regimes. Germination rate was independent of light/dark regime. Increasing salinity reduced germination of Carolina geranium from 81.1% at 0 mM to 0% at 160 mM NaCl. Seeds germination was peaked at 50% soil moisture, but was completely inhibited at &lt; 20% and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Temperature; Photoperiod; Salinity stress; Soil water content; Burial depth.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100335

Germination Ecology of Lathyrus aphaca, a Problematic Weed of Wheat Crop under Semi-Arid Conditions of Pakistan
Provedor de dados: 87
Autores: AAMIR,M.; KHAN,E.A.; BALOCH,M.S.; ASLAM,M.
ABSTRACT: Lathyrus aphaca is an aggressive dicotyledonous weed. The effect of different agroecological components/factors on the germination ecology of this weed was explored under a glasshouse and laboratory condition in 2014. The germination response of L. aphaca was lower at high temperature while maximum seed germination was found at 15/12 oC (day/night). Light significantly stimulated L. aphaca germination; nevertheless, substantial germination occurred under dark conditions. More than 86-90% of L. aphaca seeds germinated at pH level of 6.2-7.5. A significant quantity of seed germinated at 250 mM NaCl. There was no germination at -1 MPa. When the temperature was lower than 20/15 oC (day/night) initiation time of germination and germination index (GI)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Osmotic stress; Weed seeds; Salt stress; Temperature; PH; Light.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100253

Germination Ecology of Two Troublesome Weeds of Arid Chickpea: Euphorbia dracunculoides and Astragalus Species
Provedor de dados: 87
Autores: IKRAM,R.M.; TANVEER,A.; ALI,H.H.; SAFDAR,M.E.; JAVAID,M.M.; ABBAS,T.; HASHIM,S.; CHAUHAN,B.S.
ABSTRACT: The species Euphorbia dracunculoides and Astragalus are problematic weeds of arid chickpea in the chickpea mono-cropping system in Pakistan. The influence of various ecological factors on germination and seedling emergence characteristics of these weeds was determined under laboratory conditions. The results suggested that seed germination of both species was 50% at 15 oC under light conditions, and germination decreased when the temperature was increased. The increase in drought stress from 2.5 to 15% significantly decreased germination of E. dracunculoides and Astragalus spp. Both species failed to germinate at the osmotic potential of -3.02 MPa. The increase in field capacity from 25 to 100% increased emergence percentage and emergence index...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Temperature; Burial depth; Light; Management; Emergence; Salinity.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100247

Germination ecology of wild onion: a rainfed crop weed
Provedor de dados: 87
Autores: Tanveer,A.; Sibtain,M.; Javaid,M.M.; Ali,H.H.
Asphodelus tenuifolius is becoming a more common weed in rain-fed area in Pakistan. Laboratory and greenhouse experiments were conducted to determine the effect of different environmental factors on germination and emergence of A.tenuifolius. Results showed that A.tenuifolius can tolerate a wide range of varying environmental factors. Greatest percentage of germination (80%) was recorded at 15 ºC constant temperature; however, considerable germination occurred at 20 and 25 ºC. Light for 10 h photoperiod stimulate germination of Asphodelus tenuifolius compared with complete darkness. Germination was totally inhibited at osmotic stress higher than -0.8 MPa. There was no significant difference in germination at pH 6 to 8; however, there was a slightly...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Asphodelus tenuifolius; Temperature; Water stress; Salt stress; PH; Seedling emergence; Seeding depth.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582014000100008

Factors affecting Cyperus difformis seed germination and seedling emergence
Provedor de dados: 87
Autores: Derakhshan,A.; Gherekhloo,J.
Specific knowledge about the dormancy, germination, and emergence patterns of weed species aids the development of integrated management strategies. Laboratory studies were conducted to determine the effect of several environmental factors on seed germination and seedling emergence of Cyperus difformis. Germination of freshly harvested seeds was inhibited by darkness; however, when seeds were subsequently transferred to complete light they germinated readily. Our results showed that 2 wk of cold stratification overcome the light requirement for germination. Seeds of C. difformis were able to germinate over a broad range of temperatures (25/15, 30/20, 35/25, and 40/30 ºC day/night). The response of germination rate to temperature was described as a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Osmotic potential; Salinity stress; PH; Soil depth; Temperature.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582013000400008

Effects of irrigated rice sowing season and imazapyr + imazapic time of application on rice grain yield and red rice management
Provedor de dados: 87
Autores: Sartori,G.M.S.; Marchesan,E.; Azevedo,C.F.; Filho,A.C.; Roso,R.; Coelho,L.L.; Oliveira,M.L.
Irrigated rice sowing season and red rice competition are among the main factors affecting grain yield. The objective of this work was to evaluate the sowing date of irrigated rice and moments of application of the herbicide imazapyr + imazapic to control red rice management and irrigated rice grain yield. Eight experiments were performed at the following dates (09/30, 10/19, 11/08 and 12/01) for the 2010/2011 harvest season and (09/27, 10/17, 11/08 and 12/05) for the 2011/2012 harvest season. The treatments were: application of the herbicide imazapyr + imazapic at doses of 105+35 g ha-1 in pre-emergence (PRE); 52.5+17.5 g ha‑1 in pre-emergence and 52.5+17.5 g ha-1 in post-emergence (PRE + POST); and 105+35 g ha-1 in post- emergence (POST), and a control...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Weed; Herbicide; Chemical control; Temperature; Solar radiation; Oryza sativa.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582013000300015

Environmental and physiological factors that affect the efficacy of herbicides that inhibit the enzyme protoporphyrinogen oxidase: a literature review
Provedor de dados: 87
Autores: Matzenbacher,F.O.; Vidal,R.A.; Merotto Jr.,A; Trezzi,M.M.
Herbicides that inhibit the enzyme protoporphyrinogen oxidase (PROTOX) are usually effective to control dicotyledonous weeds and their agronomic efficacy is affected by environmental and physiological factors. The objective of this review is to summarize the knowledge of those factors available in the scientific literature in the last decade. Environmental factors that influence PROTOX inhibitors include temperature, irradiance and relative humidity. The most relevant physiological factors are the activity of enzymes that can detoxify herbicides and also of enzymes that mitigate the effects of oxidative stress in plants. The study also suggests some possible management strategies that could optimize the activity of PROTOX-inhibiting herbicides.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Temperature; Light; Relative humidity; Enzymes.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582014000200024

Effect of ecological factors on germination of horse purslane (Trianthema portulacastrum)
Provedor de dados: 87
Autores: Tanveer,A.; Mumtaz,K.; Javaid,M.M.; Chaudhry,M.N.; Balal,R.M.; Khaliq,A.
Trianthema portulacastrum is a very problematic summer crop weed and a complete crop failure has been observed because of this weed at high density. The effect of different ecological factors on germination of T. portulacastrum seeds collected in two different years (2009 and 2005) was studied in laboratory experiments. An increase in temperature from 25 to 35 ºC increased germination percentage of T. portulacastrum from 65 to 85%, after which germination started to decrease, reducing to 71.25% at 45 ºC. Trianthema portulacastrum had maximum germination with distilled water compared with different salt solutions and drought stress levels. Germination was significantly minimum at salinity and drought stress level of 250 mM and -0.8 MPa, respectively....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Temperature; Drought stress; Salt stress; Field capacity; PH; Sowing depth.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582013000300011

Abiotic Factors Affecting Seed Germination and Early Seedling Emergence of Large Crabgrass (Digitaria sanguinalis)
Provedor de dados: 87
Autores: WANG,Y.H.; MA,Y.L.; FENG,G.J.; LI,H.H.
ABSTRACT:  Large crabgrass is one of the worst exotic weed in tropical, subtropical, and temperate regions of the world. In this study, the abiotic factors affecting seed germination and early seedling emergence of large crabgrass were investigated under laboratory conditions. The optimum temperatures of germination occurred at the range from 25 to 35 oC under 12 h light/12 h dark condition. Some seeds could germinate in the dark, but light exposure significantly stimulated the germination. Large crabgrass seed was tolerant to salinity level range of 0 to 160 and low water potential (11% germination at -0.8 MPa). Medium pH had no significant effect on seed germination and more than 90% seeds germination was obtained over a broad pH range from 4.0 to 10.0....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Temperature; Light; Osmotic potential; Heat-shock; Burial depth.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100268

INVESTIGATION OF THE MECHANISM OF RESISTANCE TO GLYPHOSATE HERBICIDE IN HAIRY FLEABANE
Provedor de dados: 87
Autores: KASPARY,T.E.; LAMEGO,F.P.; LANGARO,A.C.; RUCHEL,Q.; AGOSTINETTO,D.
ABSTRACT The resistance of weeds to herbicides is a consequence of one or more mechanisms in the plant, responsible for not allowing the herbicide to act properly at the active site. The objective of this study was to investigate the mechanism(s) of resistance to glyphosate in Conyza bonariensis. An experiment was conducted in November and December, 2012 and repeated in February and March, 2013 using a factorial arrangement of the treatments, where the factor A corresponded to biotypes of hairy fleabane, susceptible (S) and resistant (R); the factor B to seven rates of glyphosate from 0 to 11,520 g e.a. ha-1, and factor C were simulated environmental conditions of winter (12/8 oC day/night of temperature and 10/14 h of photoperiod) and summer (28/20 oC...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conyza bonariensis; Temperature; Photoperiod; EPSPs.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582016000300555

Effect of environmental factors on the germination of Megathyrsus maximus: an invasive weed in sugarcane in Argentina
Provedor de dados: 87
Autores: C. Cabrera,Debora; Sobrero,María T.; Pece,Marta; Chaila,Salvador.
Abstract  Background: Megathyrsus maximus (Jacq.) is a perennial weed that affects many crops. In Argentina, sugarcane is the most affected.  Objective:  Study effective techniques to break dormancy and the effect of environmental factors on the germination of this weed.  Methods: Experiments were carried out in cabinet incubators twice, with five replicates per treatment. The experimental unit was made up for 50 seeds.  Results: Seed dormancy was strongly associated with the presence of glumes. Manual extractions of glumes and immersion in sulphuric acid were the most effective techniques for breaking dormancy. Megathyrsus maximus did not depend on light to germinate, and it did so both under a 12 h-light-dark photoperiod and in complete darkness, with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Megathyrsus maximus; Guinea grass; Scarification; Salt stress; Temperature; Osmotic stress; Dormancy.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100304

Germination of Solanum nigrum L. (Black Nightshade) in Response to Different Abiotic Factors
Provedor de dados: 87
Autores: DONG,H.; MA,Y.; WU,H.; JIANG,W.; MA,X.
ABSTRACT: Solanum nigrum L. (black nightshade), an annual to short-lived perennial weed, has become a problem weed in farming systems in central China. Laboratory and greenhouse experiments were conducted to examine the influence of various abiotic factors on seed germination of black nightshade to develop effective weed control programs. Seeds germinated at a range of constant temperatures from 15 to 30 oC, but no germination occurred at temperatures below 10 oC or above 35 oC. Seeds also germinated at alternating temperature regimes from 15/5 to 40/30 oC, with maximum germination (&gt; 93.5%) at the alternating temperatures of 25/15 and 30/20 oC. Germination decreased as osmotic potential became more negative, and no germination was observed at ≤ -0.8...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Burial depth; Light; Osmotic potential; Saline and alkaline stress; Seed biology; Temperature.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100245

ENVIRONMENTAL FACTORS AFFECTING SEED GERMINATION OF COMMON TEASEL (Dipsacus fullonum)
Provedor de dados: 87
Autores: DADDARIO,J.F.F.; BENTIVEGNA,D.J.; TUCAT,G.; FERNÁNDEZ,O.A.
ABSTRACT Common teasel is a widespread, invasive species that has been introduced in Buenos Aires province, Argentina, where it alters the species composition of protected areas and native grasslands. A better understanding of seed germination behavior is essential for predicting its invasion potential in new areas and would be useful for developing effective management strategies. This research, conducted under laboratory conditions, evaluated the influence of several environmental factors such as pH, constant temperature, osmotic stress, salt stress and dry storage, on germination and rate of germination of common teasel seed. Between-year variation in germination responses was also examined. Seed germination was not affected by different pH levels....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Invasive weed; Dry storage; Osmotic stress; PH; Salt concentration; Temperature.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100263

Seed germination and seedling emergence of velvetleaf (Abutilon theophrasti) and Barnyardgrass (Echinochloa crus-galli)
Provedor de dados: 87
Autores: Sadeghloo,A.; Asghari,J.; Ghaderi-Far,F.
Abutilon theophrasti and Barnyardgrass (Echinochloa crus-galli) are major weeds that affect cropping systems worldwide. Laboratory and greenhouse studies were conducted to determine the effects of temperature, pH, water and salinity stress, and planting depth on seed germination and seedling emergence of Velvetleaf and Barnyardgrass. For Velvetleaf, the base, optimum and ceiling germination temperatures were estimated as 5, 35 and 48 ºC, respectively. Seed germination was sensitive to drought stress and completely inhibited by a potential of -0.6 MPa, but it was tolerant to salinity. Salinity stress up to 45 mM had no effect on the germination of Velvetleaf, but germination decreased with increasing salt concentration. Drought and salinity levels for 50%...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: PH; Planting depth; Seed germination; Temperature; Weed.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582013000200003

The Impact of Temperature Change on Energy Demand: A Dynamic Panel Analysis
Provedor de dados: 31
Autores: De Cian,   Enrica; Lanzi,   Elisa; Roson,   Roberto.
This paper presents an empirical study of energy demand, in which demand for a series of energy goods (Gas, Oil Products, Coal, Electricity) is expressed as a function of various factors, including temperature. Parameter values are estimated econometrically, using a dynamic panel data approach. Unlike previous studies in this field, the data sample has a global coverage, and special emphasis is given to the dynamic nature of demand, as well as to interactions between income levels and sensitivity to temperature variations. These features make the model results especially valuable in the analysis of climate change impacts. Results are interpreted in terms of derived demand for heating and cooling. Non-linearities and discontinuities emerge, making it...
Tipo: Working or Discussion Paper
Palavras-chave: Energy Demand; Cooling Heating Effect; Temperature; Dynamic Panel; Resource /Energy Economics and Policy; C3; Q41; Q54.
Ano: 2007
URL: http://purl.umn.edu/9322

TEMPROB: A Fortran IV Program for Calculating Temperature Probabilities from Extreme Minimum Temperature Data
Provedor de dados: 31
Autores: Sporleder,   Thomas L.
Texas Valley Citrus Committee
Tipo: Report
Palavras-chave: TEMPROB; Temperature; Probabilities; Minimum; Research and Development/Tech Change/Emerging Technologies.
Ano: 1970
URL: http://purl.umn.edu/96143

High irradiance and temperature inhibit the germination of spores of the fern Rumohra adiantiformis (Forst.) Ching (Dryopteridaceae)
Provedor de dados: 88
Autores: BRUM,FRANCIS R.; RANDI,ÁUREA M.
Rumohra adiantiformis (Forst.) Ching is a fern (Dryopteridaceae) which is used to compose floral arrangements. Fertile fronds were harvested in the "Permanently Protected Area" of Ilha Comprida, São Paulo, Brazil. Sterilized spores were germinated in Mohr liquid medium modified by Dyer. The effect of 72%, 54%, 17% and 9% of total irradiance on germination under field conditions, was analyzed. Experiments were carried out in March (I), April (II) and August of 2000 (III). Under 54% and 72% of total irradiance in Experiment I (March) the germination was completely inhibited and partially inhibited under 72% of total irradiance in Experiment II (April). The lowest mean germination time (&lt;img border=0 width=10 height=12 id="_x0000_i1025"...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Germination; Irradiance; Rumohra adiantiformis; Temperature.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042002012000002

Thermal-biological aspects on the seed germination of Cucumis anguria L.: influence of the seed coat
Provedor de dados: 88
Autores: SANTOS,DÉBORA LEONARDO DOS; CARDOSO,VICTOR JOSÉ MENDES.
The seed coat influences the early stages of germination of many seeds and sometimes maintains seed dormancy. Early reports have shown that the testa influences the germination response of Cucumis anguria seeds to light although the response to temperature as influenced by the tegument is not well understood. The main purpose of this study was to observe the influence of the testa on the germination of Cucumis anguria by using parameters as germinability and isothermal germination rate. The assays were carried out in a thermal-gradient block with water imbibed seeds kept in darkness. Estimates of the activation enthalpies (deltaH) show |deltaH| &lt; 50 kJ.mol-1 between 26.1 °C and 35.2 °C (intact seeds) and between 25.4 °C and 35.2 °C (scarified seeds),...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cucumis anguria; Seed germination; Temperature; Tegument; Thermal-biology.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042001000400009

Effects of moisture content and temperature during storage on germination of the achenes of Bidens gardneri Baker
Provedor de dados: 88
Autores: RONDON,JOSIMARA N.; SASSAKI,REGINA M.; ZAIDAN,LILIAN B.P.; FELIPPE,G.M.
Bidens gardneri is a herbaceous species of the cerrados, whose seeds are light sensitive at 25 °C, but they become indifferent to light when stored in soil. In this work the effects of moisture content, temperature and light (during storage) upon light sensitivity during germination were studied. Ripe achenes were collected in the cerrados of Itirapina and Moji Guaçu, State of São Paulo, Brazil. The storage conditions of the achenes varied in each experiment. Achenes were stored in darkness or light, in closed bottles, at 4 °C, 20/30 °C or 25 °C. Achenes were imbibed for 24 h at 4 °C, 25 °C or 20/30 °C (in darkness) and then stored for 1, 10, 20, 30 and 40 days (40 days only for 4 °C and 25 °C). Germination tests were conducted at 25 °C and 20/30 °C. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cerrado; Light sensitivity; Storage; Moisture content; Temperature.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042001000100004

Physiological, morphological and biochemical characteristics of the sexual propagation of Piper aduncum (Piperaceae)
Provedor de dados: 88
Autores: Dousseau,Sara; Alvarenga,Amauri Alves de; Alves,Eduardo; Chaves,Izabel de Souza; Souza,Elma dos Santos; Alves,Juliana da Silva.
In this work we attempted to characterize the diaspores and the germination process of Piper aduncum L., as well as to verify the influence of the interaction between presence and absence of light (photoperiod of 12 hours and dark) and temperature (25 °C, 30 °C and 20-30 °C) and also of gibberellin (0, 50, 100, 200 and 400 mg L-1) on the root protrusion and normal seedlings formation. The diaspores are very small with a thousand seed weight of 0.3645 g, 13% moisture and protein reserve. Diaspores are strict positively photoblastic in the tested temperature range and the optimum temperature for root protrusion was 30 °C, while for normal seedlings was 25 °C. The previous permanence in the dark led to an increase in the speed of root protrusion and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Germination; Gibberellin; Light; Post-germination; Temperature.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042011000300005

Note on the germination of Vochysia tucanorum seeds treated with growth regulators
Provedor de dados: 88
Autores: Pereira,Bruno F.; Simão,Edson; Terra Filho,João B.; Cardoso,Jean C.; Cardoso,Victor J. M.
(Note on the germination of Vochysia tucanorum seeds treated with growth regulators). The aim of this work was to evaluate the germination response of Vochysia tucanorum Mart. seeds treated with GA3 and CEPA and germinated under white light or darkness. Newly collected seeds from a Cerrado area were stored for 14 days at two temperatures (25 °C ± 2 and 7 °C ± 1). After the storage period the seeds were pre-treated with distilled water (control), gibberellic acid (GA3), 2-chloroethylphosphonic acid (CEPA) and a mixture of GA3 + CEPA. Following this, the seeds were sown in Petri dishes on filter paper moistened with distilled water and germinated in either darkness or white light. The results suggest that seeds are non-photoblastic and non-dormant, however a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: CEPA; Ethylene; Gibberellin; Light; Temperature.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042011000200010

Influência de fatores ambientais sobre o crescimento in vitro de Hypnea musciformis (Wulfen) Lamouroux (Rhodophyta)
Provedor de dados: 88
Autores: BRAVIN,ISOLDA C.; YONESHIGUE-VALENTIN,YOCIE.
Hypnea musciformis (Wulfen) Lamourox (Hypneaceae, Gigartinales) é uma fonte importante para o Brasil de um agente ficocolóide geleificante (carragenano) usado na indústria. O objetivo deste estudo foi o de investigar a influência da temperatura (20 e 25 ºC), do enriquecimento água do mar com a solução de Provasoli e aeração sobre o desenvolvimento desta espécie in vitro. Os talos de H. musciformis foram coletados na Prainha, Arraial do Cabo (RJ) em duas diferentes épocas do ano de 2000 (abril e julho). No laboratório, fragmentos apicais pesando 0,2 g (15 mm de comprimento) foram excisados do talo e preparados para as incubações em diferentes combinações de fatores. Em ordem decrescente, a análise de variância multifatorial mostrou que os fatores de maior...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aeration; Culture; Enrichment; Hypnea musciformis; Temperature.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042002012000011

Isothermal seed germination of Adenanthera pavonina
Provedor de dados: 88
Autores: Zpevak,Francisco Antonio; Perez,Sônia Cristina Juliano Güaltieri de Andrade; Buckeridge,Marcos Silveira.
This work reports aspects of seed germination at different temperatures of Adenanthera pavonina L., a woody Southeast Asian Leguminosae. Germination was studied by measuring the final percentages, the rate, the rate variance and the synchronisation of the individual seeds calculated by the minimal informational entropy of frequencies distribution of seed germination. Overlapping the germinability range with the range for the highest values of germination rates and the minimal informational entropy of frequencies distribution of seed germination, we found that the best temperature for the germination of A. pavonina seeds is 35 ºC. The slope µ of the Arrhenius plot of the germination rates is positive for T &lt; 35 ºC and negative for T &amp;gt; 35 ºC. The...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Leguminosae; Synchronisation; Temperature; Thermobiology.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042012000400013

Effect of dietary betaine supplementation on the performance, carcass yield, and intestinal morphometrics of broilers submitted to heat stress
Provedor de dados: 89
Autores: Sakomura,NK; Barbosa,NAA; Longo,FA; Silva,EP da; Bonato,MA; Fernandes,JBK.
The objective of this study was to evaluate the effect of betaine in methionine- and choline-reduced diets fed to broilers submitted to heat stress. In total, 1,408 male broilers were randomly distributed into eight treatments, according to 2 x 4 (environment x diet) factorial arrangement, with eight replicates of 2 birds each. Birds were reared environmental chambers under controlled temperature (25-26 °C) or cyclic heat-stressing temperature (25-31 °C). The following diets were tested: positive control (PC), formulated to meet broiler nutritional requirements; negative control (NC), with reduced DL-methionine and choline chloride levels; and with two supplementation levels of natural betaine to the negative control diet (NC+NB1 and NC+NB2). Live...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Additives; Environment; Methionine; Temperature.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2013000200005

Effect of breeder age on eggshell thickness, surface temperature, hatchability and chick weigh
Provedor de dados: 89
Autores: Gualhanone,A; Furlan,RL; Fernandez-Alarcon,MF; Macari,M.
Two experiments were carried out to study the effect of breeder age on incubation parameters (hatchability, eggshell thickness, egg surface temperature and chick weight). In Exp. 1, fertile eggs (30- and 60-wk-old breeders) were incubated at three different temperatures (36.8, 37.8 and 38.8 ºC). Eggshell surface temperature was measured by attaching a thermocouple to the shell and data were collected in a datalogger every ten minutes. This study was conducted according to a 3 x 2 factorial design (three temperatures and two breeder ages). Data revealed that eggshell surface temperature changed according to incubation temperature, with the main increase occurring between 10 and 13 days of incubation, and that the maximum increase in eggshell surface...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broiler breeder; Development; Embryo; Temperature; Incubation.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2012000100002

Effect of temperature on incubation period, embryonic mortality, hatch rate, egg water loss and partridge chick weight (Rhynchotus rufescens)
Provedor de dados: 89
Autores: Nakage,ES; Cardozo,JP; Pereira,GT; ,SA; Boleli,IC.
The aim of this study was to determine the effects of incubation temperature (34.5; 35.5; 36.5; 37.5 and 38.5ºC), on incubation period, embryonic mortality, hatching rate, water loss and chick weight at hatch, using daily incubation of partridge (Rhynchotus rufescens) eggs. The highest hatching percentage was obtained between 35.5 and 36.5ºC. Incubation length and temperature were inversely proportional. Water loss was lower in eggs incubated at low temperatures as compared to high temperatures. There was no difference among incubation temperatures in absolute and relative hatchling weights. Early embryonic mortality increased at low temperatures (&lt;35.5ºC), whereas intermediate and late embryonic mortality increased at high temperatures (&gt;36.5ºC)....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Incubation; Hatchability; Mortality; Temperature; Water loss.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2003000200007

Physiological Responses of Slow-Growing Chickens under Diurnally Cycling Temperature in a Hot Environment
Provedor de dados: 89
Autores: Mutibvu,T; Chimonyo,M; Halimani,TE.
ABSTRACT Free-range chicken production has significantly increased in recent years and it often entails exposing birds to cyclic environmental conditions. The objective of the current study was to investigate the effect of bird strain and sex, and rearing system on the physiological responses of Potchefstroom Koekoek (PK), Ovambo (OV) and Naked Neck (NN) chickens reared in a hot environment. Body weight (BW), rectal temperature (RT), respiratory rate (RR) and heart rate (HR) were determined weekly for 4 weeks, in 3 slow-growing chicken strains under cyclic environmental conditions. A total of 288, 20-week old Potchefstroom Koekoek (PK), Ovambo (OV) and Naked Neck (NN) chickens were separated by sex and allocated to extensive and intensive rearing systems....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Extensive; Intensive; Respiratory rate; Heart rate; Strain; Temperature.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2017000400567

Storage Period Affects Weight Loss of Japanese Quail Eggs
Provedor de dados: 89
Autores: Roriz,BC; Sgavioli,S; Garcia,RG; Nääs,IA; Domingues,CHF; Caldara,FR; Rombola,LG; Ayla,CM; Bernnecke,K.
ABSTRACT Long storage periods may increase embryo mortality. The objective of this study was to evaluate the effects of storage period on the weight loss, eggshell surface temperature, hatchability, and embryonic mortality of Japanese quail eggs. Two hundred fertile eggs were collected from a flock of 30-week-old Japanese quails (Coturnix coturnix japonica). The eggs were collected for 10 consecutive days after lay, and immediately incubated. A completely randomized experimental design with 10 treatments, corresponding to the number of days eggs were stored between egg collection and setting, with 20 replicates each, was applied. Egg weight loss increased with storage period duration, starting on day 6 (2.1%, on average) and reached 3.26%, on average, in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Embryo; Hatchability; Incubation; Laying; Temperature.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2016000400589

Meeting embryonic requirements of broilers throughout incubation: a review
Provedor de dados: 89
Autores: Molenaar,R; Reijrink,IAM; Meijerhof,R; Van den Brand,H.
During incubation of chicken embryos, environmental conditions, such as temperature, relative humidity, and CO2 concentration, must be controlled to meet embryonic requirements that change during the different phases of embryonic development. In the current review, the effects of embryo temperature, egg weight loss, and CO2 concentration on hatchability, hatchling quality, and subsequent performance are discussed from an embryonic point of view. In addition, new insights related to the incubation process are described. Several studies have shown that a constant eggshell temperature (EST) of 37.5 to 38.0°C throughout incubation results in the highest hatchability, hatchling quality, and subsequent performance. Egg weight loss must be between 6.5 and 14.0%...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broiler embryos; CO2 concentration; Incubation; Relative humidity; Temperature.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2010000300001

Effect of dietary organic selenium and zinc on the internal egg quality of quail eggs for different periods and under different temperatures
Provedor de dados: 89
Autores: Fernandez,IB; Cruz,VC; Polycarpo,GV.
The objective of this study was to evaluate the internal quality of eggs of Japanese quails fed diets supplemented with chelated selenium and zinc. The experiment was carried out for 120 days, and 144 birds were divided in random blocks into four treatments (control; 0.3 ppm Se; 60 ppm Zn and 0.3 ppm Se + 60 ppm Zn). Ten, 14, 18, and 22 weeks after the beginning of lay, eggs were collected and stored under two different temperatures (environmental temperature or refrigeration) and for 10, 20, and 30 days. Eggs were analyzed for: Haugh units (HU), albumen height (AH), yolk index (YI), and albumen index (AI). Parameters were only statistically influenced by the interaction between dietary treatment and storage time. It was concluded that the addition of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eggs; Organic trace minerals; Quails; Storage; Temperature.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2011000100006

Modelling energy utilization for laying type Pullets
Provedor de dados: 89
Autores: Neme,R; Sakomura,NK; Fialho,FB; Freitas,ER; Fukayama,EH.
Three trials were carried out to determine energy metabolized (EM) requirement model for starting and growing pullets from different strains, at five ambient temperatures and different percentage feather coverage. In Trial I, metabolizable energy requirements for maintenance (MEm) and efficiency of energy utilization were estimated using 64 birds of two different strains, Hy-Line W36 (HLW36) and Hy-Line Semi-heavy (HLSH), from 9 to 13 weeks of age. The effects of ambient temperature (12, 18, 24, 30 and 36ºC) and percentage feather coverage (0, 50 and 100%) on MEm were assessed in the second trial, using 48 birds per temperature per strain (HLSH and HLW36) from 9 to 13 weeks of age. Trial III evaluated ME requirements for weight gain (MEg) using 1,200 birds...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Body composition; Energy requirements; Feather coverage; Laying hens; Model; Temperature.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2005000100007

TECHNIQUES TO MINIMIZE THE EFFECTS OF ACUTE HEAT STRESS OR CHRONIC IN BROILERS
Provedor de dados: 89
Autores: Rodrigues,MM; Garcia Neto,M; Perri,SHV; Sandre,DG; Faria Jr,MJA; Oliveira,PM; Pinto,MF; Cassiano,RP.
ABSTRACT High environmental temperature is limiting factor in broiler production. In order to minimize the undesirable consequences of acute or chronic heat stress, the techniques of fixed dietary electrolyte balance and early heat conditioning were evaluated. The objective of this study was to evaluate the possible interactions and effects of dietary electrolyte balance and early heat conditioning on feed intake, body weight, feed conversion ratio, mortality, energy bioeconomic index, fecal moisture, abdominal fat, and breast meat color (L*a*b*) of broilers submitted to chronic or acute heat stress. In total, 1280 chicks, were equally divided in experiment I (chronic heat stress, 6h/day at 32ºC from 35 to 39 d of age) and II (acute heat stress, 36 ºC for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Animal nutrition; Broilers; Electrolyte balance; Pale muscle syndrome; Temperature.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2019000300325

Internal quality of conventional and omega-3-enriched commercial eggs stored under different temperatures
Provedor de dados: 89
Autores: Cedro,TMM; Calixto,LFL; Gaspar,A; Curvello,FA; Hora,AS.
The internal quality of conventional and ω-3 enriched commercial eggs stored at different temperatures was evaluated. Eggs derived from Isa Brown layers fed two different diets. In Group 1, 432 hens were fed throughout their productive life with a diet based on corn and soybean meal (production of conventional eggs). In Group 2, starting at 22 weeks of age, other 432 hens were fed a diet containing 1.5% of marine algae substrate and 1.8% of fish oil (production of ω-3 enriched eggs). The following parameters were evaluated: Haugh unit, yolk index, albumen pH, and yolk pH. There were no significant differences between conventional and enriched with ω-3 eggs as to internal quality parameters. Only the interaction between storage time and temperature was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Commercial eggs; Hens; Omega-3; Storage; Temperature.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2009000300007

Methionine sources do not affect performance and carcass yield of broilers fed vegetable diets and aubmitted to cyclic heat stress
Provedor de dados: 89
Autores: Ribeiro,AML; Dahlke,F; Kessler,AM.
The supplementation of vegetal diets with L-methionine (100% molar), methionine hydroxyl analogue (HMB) (88% molar) or DL-methionine (99% molar) was compared as to the performance of broilers allocated in cages and submitted to cyclic heat stress (CHS). The trial was carried out from 21 to 42 days of age. Two levels of synthetic methionine were supplemented for each methionine source (0.1 or 0.3 %), and the control treatment was not supplemented with synthetic methionine (negative control). Statistical analyses included the negative control treatment or were performed in a 3 x 2 factorial design (sources x levels). Addition of synthetic methionine to the basal level containing 0.63 % of total sulphur amino acids significantly improved feed conversion (FC)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Methionine source; Poultry; Sulphur amino acids; Temperature.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2005000300004

Development and water requirements of cowpea under climate change conditions in the Brazilian semi-arid region
Provedor de dados: 91
Autores: Cavalcante Junior,Edmilson G.; Medeiros,José F. de; Espínola Sobrinho,José; Figueirêdo,Vladimir B.; Costa,João P. N. da; Santos,Wesley de O.
ABSTRACT This study aimed to determine the impacts that climate change may cause on the development and evapotranspiration of cowpea, in semi-arid climate region of Northeast Brazil. The study was conducted in the municipalities of Apodi, Ipanguaçu and Mossoró, in the state of Rio Grande do Norte. In order to evaluate the influence of climate change on crop water consumption, changes in air temperature and relative humidity were simulated using the PRECIS climate model. Two scenarios of emissions were evaluated based on the report of the Intergovernmental Panel on Climate Change: a pessimistic named A2 and an optimistic B2. The duration of the crop cycle showed an average reduction of 14 and 23 days for the optimistic and pessimistic scenarios,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Temperature; Relative humidity; Evapotranspiration.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000900783

Physiological quality of soybean seeds artificially cooled and stored in different packages
Provedor de dados: 91
Autores: Virgolino,Zirvaldo Z.; Resende,Osvaldo; Gonçalves,Douglas N.; Marçal,Kaique A. F.; Sales,Juliana de F.
ABSTRACT The aeration of seeds with artificially cooled air and their storage in big-bag packages aim to lengthen the shelf life while maintaining the quality. Thus, the objective was to study the effects of cooling before storage on germination and vigor of soybean seeds stored in trifoliate kraft paper bag and big bag in non-air-conditioned environment. Seeds of soybean cultivar NA 7337 RR were mechanically harvested in March 2013, holding an average moisture content of 18% w.b. In June, 16,000 kg of seeds were processed and cooled to 18 °C. Equal amount of non-cooled seeds was used as a control. Equally divided in kraft paper and in big bags, and combining cooling and packaging, the seeds were stored for three months and analyzed for moisture content,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Storage; Temperature; Moisture contente; Vigor; Germination.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000500473

Physical quality of grains subjected to moistening and drying processes for marketing
Provedor de dados: 91
Autores: Coradi,Paulo C.; Sousa,Alisson H. S. de; Camilo,Lucas J.; Lima,Roney E.; Milane,Lélia V.; Lemes,Ângelo F. C.
ABSTRACT The aim was to evaluate the physical quality of conventional and transgenic corn grains, through drying and wetting processes for marketing. The experimental design was completely randomized in a factorial scheme (7 x 3 x 2), corresponding to seven drying times (0, 20, 40, 60, 80, 100 and 120 min), three temperatures of the drying air (80, 100 and 120 °C) and two hybrids of corn (conventional AG 1051 and transgenic Herculex@ 30S31H). Grain drying was held in convection oven with forced air ventilation while the wetting was done in a B.O.D chamber. The water movement in the grain, the volume and the electrical conductivity were evaluated periodically. The results showed that the transgenic corn grain reduced the negative effects of drying and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: AG 1051; Herculex@ 30S31H; Water content; Temperature.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000900847

Phytosanitary quality of Brachiaria brizantha ‘BRS Piatã’ seeds in function of climate conditions
Provedor de dados: 91
Autores: Silva,Givanildo Z. da; Martins,Cibele C.; Nascimento,Luciana C. do; Barreto,Gabriel G.; Farias,Otília R. de.
ABSTRACT Infected seeds are one of the main pathogen transmission vehicles, and they are responsible for significant losses in production fields; phytosanitary defense depends on the inoculum and climatic factors. Thus, in this study, it was aimed to identify climatic variables of the regions that propitiate the production of Brachiaria brizantha ‘BRS Piatã’ seeds infected with phytopathogenic fungi. Temperature and rainfall data were obtained from 10 production fields, and phytosanitary quality of the seeds was evaluated with the filter paper method; the means were compared using the Kruskal–Wallis non-parametric analysis. Principal component analysis was performed to determine the relationship between the climatic variables and seed phytosanitary...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Forage grasses; Piatã grass; Temperature; Humidity; Phytosanitary barrier.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019000400237

Single and split nitrogen dose in wheat yield indicators
Provedor de dados: 91
Autores: Costa,Juliane S. P.; Mantai,Rubia D.; Silva,José A. G. da; Scremin,Osmar B.; Arenhardt,Emilio G.; Lima,Andressa R. C. de.
ABSTRACT Single or split nitrogen (N) supply can maximize the expression of wheat yield indicators. The objective of the study was to evaluate the greater N use efficiency on wheat yield indicators by the single and split N supply under favorable and unfavorable year conditions to the crop in succession system of high and reduced residual N release. The study was conducted in 2014 and 2015, in a randomized complete block design with four replicates in a 4 x 3 factorial, for N-fertilizer doses (0, 30, 60, 120 kg ha-1) and supply forms [full dose (100%) in the phenological stage V3 (third expanded leaf); split dose (70 and 30%) in the phenological stages V3/V6 (third and sixth expanded leaves, respectively) and; split dose (70 and 30%) in the phenological...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triticum aestivum; Urea; Residual N; Temperature; Rainfall.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000100016

Germination test of Eucalyptus phaeotricha seeds
Provedor de dados: 91
Autores: Affonso,Carlos E.; Silva,Givanildo Z. da; Jeromini,Tatiane S.; Martins,Cibele C.
ABSTRACT The rules for seed analysis do not have recommendations for conducting the germination test of Eucalyptus phaeotricha seeds. Thus, the aim of this study was to determine the best substrate, temperature, conduction time, and substrate moistening level for the germination test of E. phaeotricha seeds. First count of germination, germination, germination speed index and mean time of germination were evaluated. The first experiment was carried out in a completely randomized design, in a factorial scheme (6 x 2), corresponding to six temperature regimes (15, 20, 25, 30, 35 °C and 20-30 °C) and two substrates (paper and sand) with four replicates, and the means were compared by Tukey test at 0.05 probability level. In the second experiment, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Temperature; Substrate; Moistening; Eucalyptus tindaliae.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000900653

Desorption isotherms of Lactuca sativa seeds
Provedor de dados: 91
Autores: Zeymer,Juliana S.; Corrêa,Paulo C.; Oliveira,Gabriel H. H. de; Baptestini,Fernanda M.; Freitas,Rita C. P.
ABSTRACT Lactuca sativa seeds are highly sensitive to climate conditions; thus, they should be stored securely to maintain their qualitative and quantitative characteristics. Studies on hygroscopicity aim to decrease possible changes in agricultural products under specific environmental conditions. Accordingly, this study aims to develop an appropriate mathematical model to represent the desorption isotherms of Lactuca sativa seeds. The hygroscopic equilibrium was achieved using a static-gravimetric method at temperatures of 10, 20, 30, 40 and 50 °C and water activity in the range 0.11-0.96. Six mathematical models were fitted to the experimental data of the equilibrium moisture content of Lactuca sativa seeds. The best model was chosen based on the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mathematical modeling; Hygroscopic equilibrium; Relative humidity; Temperature.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000800568

Thermodynamic properties and drying kinetics of Bauhinia forficata Link leaves
Provedor de dados: 91
Autores: Silva,Fernanda P. da; Siqueira,Valdiney C.; Martins,Elton A. S.; Miranda,Fábio M. N.; Melo,Rogerio M.
ABSTRACT The aim of this study was to determine the effective diffusion coefficient and the thermodynamic properties of Bauhinia forficata Link leaves, considering two forms of thickness measurements and to describe the process by fitting mathematical models. The leaves were collected, taken to the laboratory and prepared to start the drying process in which four temperatures (40, 50, 60 and 70 °C) were applied. After the drying process, the effective diffusion coefficient was determined through the theory of diffusion in liquid, allowing to obtain the values of the activation energy, enthalpy, entropy and Gibbs free energy. The description of the drying process was performed by setting the thirteen mathematical models used to represent constant drying of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Medicinal plants; Effective diffusion coefficient; Temperature.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000100061

Kinetics of drying of basil leaves (Ocimum basilicum L.) in the infrared
Provedor de dados: 91
Autores: Reis,Renata C. dos; Devilla,Ivano A.; Ascheri,Diego P. R.; Servulo,Ana C. O.; Souza,Athina B. M.
The objective of this paper was to model the drying curves of the leaves of basil (Ocimum basilicum L.) in the infrared at temperatures of 50, 60, 70 and 80 ºC and to evaluate the influence of drying temperature on the color of dried leaves. Drying was conducted in infrared dryer with temperature and greenhouse air circulation. Experimental data were fitted to eight mathematical models. The magnitude of the coefficient of determination (R²), the mean relative error (P), the estimated mean error (SE) and chisquare test (χ2) were used to verify the degree of fitness of the models. From the study it was concluded that: a) the behavior of the drying curves of basil leaves was similar to most agricultural products, the drying times in the infrared were less...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Medicinal plants; Dehydration; Temperature; Chlorophyll.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662012001200012

Simulation of wheat yield by nitrogen and nonlinearity of environmental conditions
Provedor de dados: 91
Autores: Trautmann,Ana P. B.; Silva,José A. G. da; Binelo,Manuel O.; Valdiero,Antonio C.; Henrichsen,Luana; Basso,Natiane C. F.
ABSTRACT Fuzzy logic can simulate wheat productivity by assisting crop predictability. The objective of the study is the use of fuzzy logic to simulate wheat yield in the conditions of nitrogen use, together with the effects of air temperature and rainfall, in the main cereal succession systems in Southern Brazil. The study was conducted in the years 2014, 2015 and 2016, in Augusto Pestana, RS, Brazil. The experimental design was a randomized block design with four repetitions in a 4 x 3 factorial scheme for N-fertilizer doses (0, 30, 60, 120 kg ha-1) and nutrient supply forms [100% in phenological stage V3 (third expanded leaf); (70%/30%) in the phenological stage V3/V6 (third and sixth expanded leaf) and; fractionated (70%/30%) at the phenological stage...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triticum aestivum; Temperature; Precipitation; Fuzzy logic; Modeling.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662020000100044

Influência da temperatura sobre a longevidade, fecundidade e atividade hematofágica de Aedes (Stegomyia) albopictus Skuse, 1894 (Diptera, Culicidae) sob condições de laboratório
Provedor de dados: 92
Autores: Calado,Daniéla C.; Navarro-Silva,Mario Antonio.
Influence of temperature on longevity, fecundity, and haematophagic activity of Aedes (Stegomyia) albopictus Skuse, 1894 (Diptera, Culicidae) under laboratory condition. Based on adults of Aedes albopictus maintained under four constant temperatures, 15ºC, 20ºC, 25ºC and 30ºC, longevity of males and females, fecundity, eggs viability, number of days from emergence to the first bloodsucking, and duration of the preoviposition period were observed. The average of the longevity for female was 19.45, 59.35, 61.55 and 42.72 days, under 15ºC, 20ºC, 25ºC and 30ºC, respectively. The greatest average number of bloodsucking per female was 8.32, under 25ºC. The average number of eggs per female was 1.00, 73.91, 269.87 and 183.69, and the greatest rates of viable eggs...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aedes albopictus; Biology; Fecundity; Longevity; Temperature.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262002000100011

Temporal distribution of Aedes aegypti Linnaeus (Diptera, Culicidae), in a Hospital in Cuiabá, State of Mato Grosso, Brazil
Provedor de dados: 92
Autores: Carvalho-Leandro,Danilo de; Ribeiro,Ana Lúcia Maria; Rodrigues,Jorge Senatore Vargas; Albuquerque,Cleide Maria Riberiro de; Acel,Anagela Maria; Leal-Santos,Fábio Alexandre; Leite Jr,Diniz Pereira; Miyazaki,Rosina Djunko.
This study aimed at registering and monitoring the presence of Aedes aegypti in the University Hospital Júlio Muller, Cuiabá-MT, as well as investigating the influence of temperature and rainfall on its temporal distribution and egg densities in ovitraps. The study was performed from April/2007 to March/2008, utilizing ovitraps with 10% of hay infusion and a wood paddle as an oviposition substrate. For surveillance, one ovitrap was placed in each of the 12 points distributed throughout the hospital. Ovitraps were collected monthly at the end of a 5-day installation period. After egg counting, wood paddles were immersed in water to allow larval eclosion for species identification through optical microscopy. Egg Density Index (EDI), Positive Ovitraps Index...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Monitoring; Ovitraps; Rainfall; Temperature.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262010000400025

Biological characteristics and parasitism capacity of Trichogramma pretiosum Riley (Hymenoptera, Trichogrammatidae) on eggs of Spodoptera frugiperda (J. E. Smith) (Lepidoptera, Noctuidae)
Provedor de dados: 92
Autores: Bueno,Regiane Cristina Oliveira de Freitas; Bueno,Adeney de Freitas; Parra,José Roberto Postalli; Vieira,Simone Silva; Oliveira,Luciele Januário de.
This study aimed at evaluating the biological characteristics and the capacity of parasitism of a Trichogramma pretiosum Riley, 1869 (Hymenoptera, Trichogrammatidae) strain (T. pretiosum RV) collected in Rio Verde County, State of Goiás, Brazil. The study was carried out on eggs of Spodoptera frugiperda (J. E. Smith, 1797) (Lepidoptera, Noctuidae) and conducted under controlled environmental conditions at different constant temperatures. The biological parameters determined were: developmental time (egg-adult; days); emergence (%); sex ratio; number of progeny/egg; number of generation/year; thermal constant (K); temperature threshold (Tb); daily number of parasitized eggs; cumulative parasitism (%); total number of eggs parasitized by T. pretiosum; and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biological control; Egg parasitoids; Fall armyworm; Temperature.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262010000200016

Effects of fruiting on the growth of Arabica coffee trees as related to carbohydrate and nitrogen status and to nitrate reductase activity
Provedor de dados: 93
Autores: AMARAL,JOSÉ A.T.; DA MATTA,FÁBIO M.; RENA,ALEMAR B.
Active vegetative and reproductive growth in field-grown trees of Coffea arabica L. in Viçosa (20º45’S, 650 m altitude), south-eastern Brazil, occur concurrently. The overall patterns of branch growth and leaf area gain were to a certain extent altered by fruit removal, with growth rates being remarkably greater in de-fruited trees. The content of N-NO3 was not affected by fruiting, whilst that of amino-N was greater in de-fruited than fruiting trees most of the time, but the differences were not large enough to have significantly contributed to the increased growth rates in de-fruited trees. Leaf nitrate reductase activity was greater in plants bearing fruit than in non-bearing ones most of the time; activity was roughly inversely associated with growth....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amino acids; Ammonium; Coffea arabica; Nitrate; Starch; Sugars; Temperature.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-31312001000100008

Physiological potential of seeds and morphological characterization of Campomanesia adamantium seedlings
Provedor de dados: 94
Autores: Leão-Araújo,Érica Fernandes; Souza,Eli Regina Barboza de; Peixoto,Nei; Gomes-Júnior,Francisco Guilhien.
Abstract  The cultivation of native fruit species depends on the existence of consistent technical and scientific information on the germination and vigor of seeds for efficient management by seedling producers. The evaluation of the physiological potential of seeds is performed through germination and vigor tests, which must be standardized to ensure the generation of accurate information. For Campomanesia adamantium, information on parameters for conducting physiological tests is scarce. The aims of this work were (i) to evaluate the effect of temperature and seed positioning on the substrate for seed germination and vigor, and (ii) to characterize and describe the essential structures and main types of seedling abnormality. After harvest, fruits were...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Abnormal seedling; Gabiroba; Temperature; Viability; Vigor.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452019000402001

INFLUENCE OF DIFFERENT TEMPERATURE LEVELS ON THE DATE OF FULL BLOOM OF PEACH VARIETIES IN SUBTROPICAL CLIMATE
Provedor de dados: 94
Autores: POLA,AUGUSTO CARLOS; BRUNA,EMILIO DELLA; BACK,ÁLVARO JOSÉ; MORETO,ALEXSANDER LUÍS.
ABSTRACT  The dormancy dynamics of temperate fruit tree species is complex and highly variable according to genotype and environment. Due to this variability, many phenological models of cold units have not been suitable for subtropical climatic conditions in southern Brazil. The aim of this study was to evaluate the influence of air temperature on the peach dormancy in Urussanga-SC. For this purpose, the correlations between the date of full bloom of sixteen peach varieties and the total hours in which the temperatures remain in certain thermal levels were evaluated. Two groups of varieties with highly differentiated responses to temperature in various times were identified. In the first group, consisting of ten varieties, the beginning of significant...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Prunus persica; Dormancy; Temperature; Statistical method.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452016000400802

Phenology of Campomanesia adamantium (Cambess.) O. Berg in Brazilian Cerrado
Provedor de dados: 94
Autores: Leão-Araújo,Érica Fernandes; Souza,Eli Regina Barboza de; Naves,Ronaldo Veloso; Peixoto,Nei.
Abstract Campomanesia adamantium is a fruit tree native to Cerrado and important for human consumption as food, herbal medicine and even in the beverage industry. The aim of this study was to evaluate the vegetative and reproductive phenology of C. adamantium plants in the region of Ipameri-GO, the synchronization of phenophases and the correlation with climatic data. Rainfall, relative humidity, average, maximum and minimum temperature, as well as sprouting, flowering and fruiting data of C. adamantium plants were collected between September and December of 2016 and 2017. Graphs were plotted for climatological data and phenological phases. Phenophase synchrony analysis and correlation of these phases with the climate of the region were performed....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Flowering; Fructification; Gabiroba; Phenophases; Rainfall; Relative humidity; Savannah; Sprouting; Temperature.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452019000200203

CORRELATION AMONG DAMAGES CAUSED BY YELLOW BEETLE, CLIMATOLOGICAL ELEMENTS AND PRODUCTION OF GUAVA ACCESSES GROWN IN ORGANIC SYSTEM
Provedor de dados: 94
Autores: GALLI,JULIANA ALTAFIN; MICHELOTTO,MARCOS DONISETI; FISCHER,IVAN HERMAN; SOARES,MARIA BEATRIZ BERNARDES; MARTINS,ANTÔNIO LUCIO MELLO.
ABSTRACT The objective of this research was evaluate the damage caused by the yellow beetle on 85 guava accessions and correlations of the damage with the climatological elements and the production of fruit in an orchard of guava conducted in organic system. Ten leaves by access were analyzed containing the injury of insect attack. Each leaf had its foliar area measured by leaf area meter and, after obtaining the total area, the leaf was covered with duct tape, and measure again. The averages were compared by Scott-Knott test at 5% probability. The 15 accessions with highest average damage had the data submitted to the correlation with the minimum and maximum temperature, precipitation and relative humidity. The production was obtained by the number of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Psidium guajava; Costalimaita ferruginea; Temperature; Precipitation; Relative humidity.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452017000300402

Physical purity and germination of sugarcane seeds (caryopses) (Saccharum spp.)
Provedor de dados: 95
Autores: Caieiro,Juliana Terezinha; Panobianco,Maristela; Bespalhok Filho,João Carlos; Ohlson,Osvaldo de Castro.
Plant breeding is generally done through sexual reproduction even when the species is propagated asexually for commercial exploitation, as for example, in sugarcane. Therefore, the development of procedures to evaluate sugarcane seed viability is important for plant breeding programs. The objective of this research was to develop a methodology for analyzing the viability of sugarcane seeds (Saccharum spp.). Three crosses were used, two biparental crosses and one polycross. For the germination test study, two substrates (paper and sand) and three constant incubation temperatures (25 ºC, 30 ºC and 35 ºC), in the presence of constant light and also an alternating temperatures (20-30 ºC), with 8 hours light (30 ºC) and 16 hours darkness (20 ºC), were studied....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Substrate; Temperature; Plant breeding.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-31222010000200017

Hydric restriction as vigor assessment method of soybean seeds
Provedor de dados: 95
Autores: Costa,Denis Santiago da; Rocha,Cartiane Rubishirley Macêdo da; Novembre,Ana Dionisia da Luz Coelho.
The objective of this study was to investigate the possibility of using hydric restriction as a method for evaluating vigor of soybean seeds. The soybean seeds, cultivar BRS 245RR, represented by four different seed lots, were characterized by germination and vigor. For the treatment of hydric restriction and temperature, the combination of substrate water potential and temperature were the following: deionized water (0.0 MPa); polyethylene glycol (PEG 6000) aqueous solution (-0.1, -0.3 and -0.5 MPa); and four temperatures (20 ºC, 25 ºC, 30 ºC, and 35 ºC), respectively. A completely randomized experimental design was used, with four replications per treatment, and the ANOVA was performed individually for each combination of temperature and water potential...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Temperature; PEG6000; Physiological potential.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-31222012000200008

Assessment of the physiological potential of bell pepper seeds and relationship with seedling emergence
Provedor de dados: 95
Autores: Gagliardi,Bruna; Marcos Filho,Júlio.
The objective in this study was to verify the efficiency of different procedures for evaluating the physiological potential of bell pepper seed and identify its relationship with germination at different temperatures and with seedling emergence. Five seed lots each of the Reinger and Sentinel hybrids were used. Seed physiological potential was evaluated by germination, saturated salt accelerated aging (48 h/41 °C), seedling emergence (percentage and speed), and tetrazolium tests (preconditioning at 45 °C/3 h and seed staining at 45 °C/2 h). Germination (percentage and speed) on a thermogradient table at 15 °C, 18 °C, 21 °C, 25 °C and 30 °C was also evaluated the saturated salt accelerated aging and tetrazolium tests are suitable for access the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Capsicum annuum; Seed analysis; Germination; Vigor; Temperature.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-31222011000100018

Evidence of vertical migration in the Ipanema bat Pygoderma bilabiatum (Chiroptera: Phyllostomidae: Stenodermatinae)
Provedor de dados: 103
Autores: Esbérard,Carlos E. L.; Lima,Isaac P. de; Nobre,Pedro H.; Althoff,Sérgio L.; Jordão-Nogueira,Tássia; Dias,Daniela; Carvalho,Fernando; Fabián,Marta E.; Sekiama,Margareth L.; Sobrinho,Artur Stanke.
Migration is defined as a seasonal and cyclic population movement observed in all animal classes and studied mainly in vertebrates. A considerable part of the knowledge on migration comes from birds, for which migration is an important aspect of their biology. In the case of bats, females usually migrate larger distances than males in some species. The present study analyzes the seasonal occurrence of Pygoderma bilabiatum (Wagner, 1843) at different elevations, in order to test for a pattern that evidences migration, using data from the states of Espírito Santo, Minas Gerais, Rio de Janeiro, São Paulo, Paraná, Santa Catarina, and Rio Grande do Sul, Brazil. A total of 529 specimens of P. bilabiatum were captured. Pygoderma bilabiatum seems to be more...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic Forest; Brazil; Capture efficiency; Seasonality; Temperature.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702011000600004

Ecological niche differentiation between Acanthodactylus micropholis and A. khamirensis (Sauria: Lacertidae) in southern Iran
Provedor de dados: 103
Autores: Heidari,Nastaran.
ABSTRACT Acanthodactylus micropholis Heidari, Rastegar-Pouyani, Rastegar-Pouyani &amp; Rajabizadeh, 2013 and A. khamirensis Blanford, 1874 are genetically and morphologically distinct, but their ecological differentiation has not previously been evaluated. The ecological niche models of these two sister species Acanthodactylus were reconstructed using climate and geographical data. Species distribution modeling for A. micropholis and A. khamirensis was used to make predictions and showed that most parts of southern and southeastern Iran are suitable for the distribution of both species. Habitat suitability was mostly dependent upon minimum temperature of the coldest month and seasonal precipitation for A. micropholis and A. khamirensis, respectively. Niche...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ecological species concept; Fringed-toed lizard; Iranian Plateau; Precipitation; Temperature.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702019000100308

Influence of structural habitat use on the thermal ecology of Gonatodes humeralis (Squamata: Gekkonidae) from a transitional forest in Maranhão, Brazil
Provedor de dados: 103
Autores: Miranda,Jivanildo P.; Ricci-Lobão,Andréa; Rocha,Carlos Frederico D.
We studied the structural habitat use and the thermal ecology of Gonatodes humeralis (Guichenot, 1855) in São Luís, Maranhão, Brazil, to examine intersexual differences in the use of perch features and to simultaneously analyze reciprocal differences on thermal ecology between the sexes. Gonatodes humeralis body temperature was strongly correlated with environmental temperatures (air and substrate), but air temperature had an additional effect on the males' body temperatures after removing the effect of the substrate temperature. Males and females differed significantly in perch height use above ground (males perched higher) but the sexes did not differ in the trunk perimeter used. Gonatodes humeralis tended to use the larger tree trunks available in its...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gecko; Temperature; Intersexual differences; Microhabitat; Thermoregulation.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702010000100006

Thermal tolerance of the zoea I stage of four Neotropical crab species (Crustacea: Decapoda)
Provedor de dados: 103
Autores: Rebolledo,Adriana P.; Collin,Rachel.
ABSTRACT Although larval stages are often considered particularly vulnerable to stressors, for many marine invertebrates studies of thermal tolerance have focused on adults. Here we determined the upper thermal limit (LT50) of the zoea I of four Caribbean crab species (Macrocoeloma trispinosum, Aratus pisonii, Armases ricordi, and Minuca rapax) and compared their thermal tolerance over time and among species. The zoea from the subtidal species M. trispinosum and tree climbing mangrove species A. pisonii had a lower thermal tolerance, 35 and 38.5 °C respectively, than did the semiterrestrial A. ricordi and M. rapax. In all four species tested, the estimates of thermal tolerance depend on the duration of exposure to elevated temperatures. Longer exposures to...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Caribbean; Larvae; Survival; Temperature; Exposure time.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702018000100501

Available phosphorus for 15- to 30-kg pigs kept in hot environment
Provedor de dados: 96
Autores: Alebrante,Leandro; Donzele,Juarez Lopes; Oliveira,Rita Flavia Miranda de; Saraiva,Alysson; Guimarães,Simoni Eliza Facioni; Ferreira,Aloízio Soares; Silva,Francisco Carlos de Oliveira; Abreu,Márvio Lobão Teixeira de.
This experiment was conducted to determine the requirement of available phosphorus (aP) for pigs kept in hot environment. Seventy-two pigs (36 castrated males and 36 females) with initial weight of 15.10±0.31 kg were allotted in a completely randomized block design with six treatments (0.107, 0.214, 0.321, 0.428, 0.535, and 0.642% of aP), six replicates and two pigs (1 castrated male and 1 female) per experimental unit. Pigs were kept in a hot environment with temperature of 34.1±0.8 ºC. The levels of aP influenced the daily weight gain, which increased quadratically up to the estimated level of 0.477%, and feed conversion, which improved quadratically up to the estimated level of 0.457%. The levels of aP also influenced the content of phosphorus in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genotype; Minerals; Requirement; Swine; Temperature.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011001200016

Energy requirement for maintenance and gain for two genotypes of quails housed in different breeding rearing systems
Provedor de dados: 96
Autores: Jordão Filho,José; Silva,José Humberto Vilar da; Silva,Cidinei Trajano; Costa,Fernando Guilherme Perazzo; Sousa,Janaína Maria Batista de; Givisiez,Patrícia Emília Naves.
This study aimed to estimate the energy requirements for maintenance and gain of Japanese and European quails under growth housed in two rearing systems: floor pens and cages. To determine maintenance requirements, two experiments were conducted with birds housed in cages in environmental chambers (experiment 1) and in floor pens at room temperature conditions (experiment 2). The experimental design was completely randomized with four levels of feed supply (100, 75, 50 and 25%) and four repetitions. Energy requirements for maintenance were estimated by the comparative slaughter method through a feeding trial. In experiment 1, 64 Japanese and European quails per treatment were housed in cages of climatic chambers at 18, 24, and 28 °C, while in experiment 2,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Breeding system; Energy; Modeling; Temperature.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011001100019

Dietary crude protein reduction on growth and carcass performance of 22 to 42-day-old broilers reared under different temperatures
Provedor de dados: 96
Autores: Oliveira,Will Pereira de; Oliveira,Rita Flávia Miranda de; Donzele,Juarez Lopes; Oliveira Neto,Adhemar Rodrigues de; Gomes,Paulo Cezar; Maia,Ana Paula de Assis; Campos,Paulo Henrique Reis Furtado; Gasparino,Eliane.
This study was conducted to verify the effects of dietary crude protein reduction on growth and carcass performance of 22-42-day-old broilers reared under different temperatures. Treatments were set up in a five by two factorial arrangement, with five crude protein levels (220, 210, 200, 190 and 184 g/kg) and two temperatures (21.6 and 32.2 ºC). Diets were isocaloric and essential amino acid-to-lysine ratio was maintained constant in all treatments. There was no interaction between crude protein reduction and environmental temperature for any of the parameters evaluated. Crude protein had no influence on feed intake. Nevertheless, weight gain and feed conversion ratio were linearly influenced by crude protein reduction. Worse performance was also observed...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Breast yield; Heat stress; Temperature; Thermoneutral temperature.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013000800010

Influence of feeding regime and finishing system on lamb muscle fiber and meat quality
Provedor de dados: 96
Autores: Gallo,Sarita Bonagurio; Siqueira,Edson Ramos de; Delgado,Eduardo Francisquine; Silva,Maeli Dal Pai; Rosa,Gilberto Teixeira da.
The study verified the influence of different nutritional levels of the dams, before parturition, the weaning age of the lambs and the finishing system on lamb muscle fiber morphology and meat quality. Ile-de-France × Bergamacia crossbred dams grazing on natural grassland were divided into two groups: 1) nutritional supplement 30 days before the parturition (SUPL), and 2) no nutritional supplement (NS). These groups were further subdivided by weaning age of the lambs, which corresponded to either 45 or 60 days. The weaned lambs from each of the previous groups were also divided into different finishing systems: confined and fed a complete diet (CD), confined and fed hay (H) and kept on grassland (P). The lambs were slaughtered at 30 kg live weight (CD and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Muscle fiber type; Myofibrill; Morphology; PH; Temperature.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982009001100020

Productive performance and economic evaluation of tilapia stocked in different times of the year
Provedor de dados: 96
Autores: Costa,Jesaias Ismael da; Sabbag,Omar Jorge; Ayroza,Luiz Marques da Silva; Martins,Maria Inez Espagnoli Geraldo.
ABSTRACT This study aimed to determine production cycles based on the stocking period and the influence of the cycles on productive performance indices, production costs, and profitability. The present study was carried out on a fish farm located in Palmital - SP, Brazil, which consists of 2706 m3 of net cages with an annual production of 400 tons of tilapia and regular harvests throughout the year. Production data, investment and expenditures were obtained by using a semi-structured questionnaire to calculate the total operational costs and profit indices. All monetary values of invested items have been corrected by the General Price Index (GPI) for December 2014. Three rearing phases were identified and characterized as the nursery, pre-finishing, and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fish farm; Production costs; Profitability; Temperature.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982017000700553

Effect of different substrates on composting of poultry litter
Provedor de dados: 96
Autores: Orrico,Ana Carolina Amorim; Centurion,Stanley Ribeiro; Farias,Romildo Marques de; Orrico Junior,Marco Antonio Previdelli; Garcia,Rodrigo Garófallo.
The objective was to evaluate the differences between distinct types of litter material and their combinations in the dynamics of degradation on the organic matter fractions and the quality of the final compound. The treatments were established according to material used as substrate for broiler litter: treatment 1 - rice husks; 2 - sugar cane bagasse; 3 - wood shavings; 4 - wood shavings + sugar cane bagasse; 5 - rice husks + sugar cane bagasse; and 6 - Napier grass. The following variables were monitored: temperature, levels of total solids (TS), volatile solids (VS), mass and volume of the pile, fibrous fraction, and levels and reductions of N, P and K during the process. Piles formed with Napier grass and sugar cane bagasse presented the highest...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broiler production; Cellulose; Lignin; Temperature; Total solids.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000700028

Application of a precision nutrition tool for growing and finishing pigs
Provedor de dados: 96
Autores: Lovato,Gustavo Dias; Vale,Marcos Martinez do; Oliveira,Vladimir de; Klein,Daniela Regina; Branco,Tatiane.
ABSTRACT The objective of this study was to evaluate a growth model applied to adjust nutritional programs for growing and finishing pigs, in a commercial production context. The phase I (calibration) was conducted in a commercial pig production unit. The data were collected from a nutritional program, a feed program, and an animal profile. In experimental phase II, these data were entered in the InraPorc® model for simulations and to propose adjustments to the commercial nutritional program. Afterwards, the conventional nutritional program (CNP) and the adjusted nutritional program (ANP) were compared with InraPorc® simulation. Animal profile was collected by weighing 30% of pigs per stall and monitoring their feed intake in each stage. Four hundred and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: InraPorc®; Modeling; Pig production; Temperature.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982017000900755

Reduction in the protein level and addition of oil in diets for finishing pugs under different temperatures
Provedor de dados: 96
Autores: Rodrigues,Nair Elizabeth Barreto; Tadeu Filho,Elias; Zangeronimo,Márcio Gilberto; Cantarelli,Vinícius de Souza; Rodrigues,Paulo Borges; Rodrigues Filho,Moacir; Gomide,Elisangela Minati; Betarelli,Rafael Pedroso.
The objective of this study was to evaluate the effect of reducing the crude protein (CP) with the use of amino acids in diets with the same amount of calories anddifferent levels of soybean oil (SO) for finishing pigs kept in two different ambient temperatures. A total of 120 barrows (initial weight of 68.0±1.9 kg) were utilized for the experiment. The design was of randomized blocks in a 2 × 3 × 2 factorial arrangement (two levels of CP, 16.2 and 13.7%; three levels of SO, 1.5; 3.0 and 4.5%; and two ambient temperatures, 19 and 31 ºC), totaling twelve treatments with five replicates for thirty days. The heat reduced feed intake (FI) of the animals, regardless of the levels of CP and SO used, and reduced weight gain (WG) in diets with reduced CP and SO or...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carcass; Nutrition; Performance; Temperature.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000800011

Available phosphorus levels in diets for pigs with high genetic potential for lean meat deposition kept in thermoneutral environment from 15 to 30 kg
Provedor de dados: 96
Autores: Alebrante,Leandro; Donzele,Juarez Lopes; Oliveira,Rita Flávia Miranda de; Saraiva,Alysson; Guimarães,Simone Eliza Facioni; Ferreira,Aloízio Soares.
It was used 72 pigs, 36 castrated males and 36 females, with initial weight of 14.97 ± 0.36 kg to evaluate levels of dietary available phosphorus (aP). The animals were distributed in a completely randomized block design, with six levels of aP (0.107; 0.214; 0.321; 0.428; 0.535 and 0.642%), six replicates and two animals (one castrated male and one female) per experimental unit. Air temperature and relative humidity in the room were kept at 24.5 ± 1.2°C and 76.3 ± 8.5%, respectively. The levels of aP influenced both daily feed intake and daily weight gain, which increased in a quadratic way up to the estimated levels of 0.420% and 0.443%, respectively and feed conversion, which improved in a quadratic manner up to the estimated level of 0.461%. It was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genotype; Minerals; Requirement; Swine; Temperature.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000200013

Variability in per capita oogonia and sporophyte production from giant kelp gametophytes (Macrocystis pyrifera, Phaeophyceae)
Provedor de dados: 97
Autores: MUÑOZ,VERÓNICA; HERNÁNDEZ-GONZÁLEZ,MARÍA C.; BUSCHMANN,ALEJANDRO H.; GRAHAM,MICHAEL H.; VÁSQUEZ,JULIO A.
Vegetative growth and fertility of kelp gametophytes are thought to be antagonistic, such that most successful kelp recruitment is assumed to result from fertilization of single oogonia released from unicellular female gametophytes. We used laboratory culture experiments to study the effect of temperature and nutrient addition on the per capita production of oogonia and sporophytes from Macrocystis pyrifera female gametophytes. Our results indicate that individual multicellular female gametophytes can give rise to more than one oogonium and that per capita oogonia production significantly increases with the enhancement of culture conditions (i.e., decreased temperature and increased nutrient concentration). Furthermore, the production of multiple oogonia...
Tipo: Journal article
Palavras-chave: Gametophytes; Macrocystis pyrifera; Nutrients; Oogonia production; Sporophyte production; Temperature.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2004000400007

Stress tolerance of Antarctic macroalgae in the early life stages
Provedor de dados: 97
Autores: Navarro,Nelso P.; Huovinen,Pirjo; Gomez,Ivan.
BACKGROUND: Early life stages of macroalgae, especially from polar species, can be highly vulnerable to physical stressors, leading to important consequences for the fate of the whole population in scenarios of changing environmental variability. In the present study, tolerance to UV and temperature stress, as measured by rapid adjustment of photochemistry, Fv/Fm, and photosynthetic characteristics based on P-E curves (ETRmax, &amp;#945; and Ek), was assessed in the early life stages of six Antarctic macroalgal species from eulittoral (Pyropia endiviifolia, Iridaea cordata, Adenocystis utricularis and Monostroma hariotii) and sublittoral (Ascoseira mirabilis and Gigartina skottsbergii. RESULTS: Reproductive cells of eulittoral species showed the highest...
Tipo: Journal article
Palavras-chave: Antarctica; Reproductive cells; Seaweeds; Temperature; UV tolerance.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2016000100005

Immunological vulnerability and adjustments to environmental thermal variability
Provedor de dados: 97
Autores: BOZINOVIC,FRANCISCO; CATALÁN,TAMARA P; KALERGIS,ALEXIS M.
Ecological physiologists recognize the potential impacts of temperature on physiological traits, however less attention has been paid to changes in thermal variation on a scale that pertains directly to living organisms. Also, few studies have examined the effects of temperature variation or other climatic drivers on host-pathogen interactions. We evaluated the effect of acclimation to ambient temperature variability (0, 4 and 8 °C daily variability) on the immune performance in the insect Tenebrio molitor (Coleoptera). We observed that antibacterial activity differed significantly between treatments. In addition, variances of antibacterial activity were larger under the more variable thermal conditions. Similarly to antibacterial responses, tyrosinase...
Tipo: Journal article
Palavras-chave: Ecoimmunology; Immune performance; Mealworm beetles; Temperature; Tyrosinase phenoloxidase.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2013000400009

Photosynthetic UV stress tolerance of the Antarctic snow alga Chlorella sp. modified by enhanced temperature?
Provedor de dados: 97
Autores: Rivas,C.; Navarro,N.; Huovinen,P.; Gómez,I.
BACKGROUND: Photosynthetic characteristics and the effect of UV radiation and elevated temperature measured were studied in Chlorella sp. isolated from a snow microalgal community at King George Island, Maritime Antarctica through the chlorophyll florescence (rapid light curves and maximum quantum yield, respectively). The environmental context was monitored through measurements of spectral depth profiles of solar radiation (down to 40 cm) in the snowpack as well as a through continuous recording of temperature and PAR using dataloggers located at different depths (0-30 cm) within the snow column RESULTS: The photochemistry of Chlorella sp. was affected by UV radiation in a 12-h laboratory exposure under all studied temperatures (5, 10, 15, 20 °C): the...
Tipo: Journal article
Palavras-chave: Antarctica; Snow algae; Chlorella sp; Photosynthesis; UV radiation; Temperature.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2016000100006

The effects of temperature and oxygen availability on intracapsular development of Acanthina monodon (Gastropoda: Muricidae)
Provedor de dados: 97
Autores: FERNÁNDEZ,MIRIAM; PAPPALARDO,PAULA; JENO,KATHERINE.
Freshwater and marine organisms show similar models of parental care and are faced with similar constraints to brood, which suggest that comparable environmental limits drive the evolution of parental care in aquatic systems. In fact, the low diffusion coefficient and solubility of oxygen in aquatic environments affect oxygen acquisition and therefore the capacity to aggregate embryos. The effect of other critical environmental variables, such as temperature, is less clear. We assessed the effects of temperature and oxygen availability on (1) the number of developed and undeveloped encapsulated embryos, (2) the proportion of embryos reaching advanced stages during intracapsular development (counting not only developed and undeveloped embryos but also...
Tipo: Journal article
Palavras-chave: Brooding; Intracapsular development; Gastropods; Oxygen; Temperature.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2006000200002

Optimisation of the liquid-liquid extraction of soybean oil using a binary mixture1
Provedor de dados: 124
Autores: Martins,Glêndara Aparecida de Souza; Peluzio,Joênes Mucci.
The soybean has been widely studied due to its constituents and to their application. Authors have pointed out that its composition can vary, with its use frequently taking the form of oil. The oil extraction process, which is in constant application in the market, consists of the use of extraction solvents, with hexane being one of the most used; however the fact that this comes from non-renewable sources has aroused interest in its replacement. As a result, ethanol has been seen as an alternative solvent, despite increasing the cost of the process. This study therefore aims to evaluate the composition of three soybean cultivars planted in the region of Palmas, in the state of Tocantins, Brazil, and to optimise oil extraction from the beans through the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Extraction Solvent; Temperature; Time.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902015000100064

Ecophysiology of seed germination in Digitaria insularis ((L.) Fedde)
Provedor de dados: 124
Autores: Mendonça,Giovana Soares de; Martins,Cibele Chalita; Martins,Dagoberto; Costa,Neumárcio Vilanova da.
The invasive behaviour of sourgrass (Digitaria insularis) in cultivated areas is due to its strategy of aggressive regeneration, which is based on seed germination. Knowledge of the physiological ecology of this species can contribute to the development of management and control strategies. The aim of this research was to understand the effects of provenance, temperature and light on the germination of sourgrass seeds collected in the Brazilian state of São Paulo in the cities of Americana, Botucatu and São José do Rio Preto and in the state of Paraná in the city of São Miguel do Iguaçu. The seeds were left to germinate at temperatures of 15, 25, 35 and 45 °C, both with and without light. The number of normal seedlings was recorded daily from seven to 60...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sourgrass; Plant physiology; Provenance; Light; Temperature.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902014000400021

CALIBRATION OF THE HARGREAVES-SAMANI EQUATION FOR SPECIFIC PERIODS OF THE YEAR IN THE MUNICIPALITY OF JAÍBA-MG, BRAZIL
Provedor de dados: 107
Autores: Duarte, Anunciene Barbosa; Ferreira, Lucas Borges; dos Santos, Edson Fagne.
Reference evapotranspiration (ET0) explains the climatic effects on crop water demand. The Food and Agriculture Organization (FAO) recommends the Penman Monteith equation as a standard method for estimating ET0. However, because this equation requires a large amount of meteorological data, it has limited application. An alternative is the Hargreaves-Samani (HS) equation, which only requires air temperature data, and can be calibrated to specifc locations and periods. The present study aimed to calibrate the empirical parameters (coeffcients and exponent) of the HS equation for specifc periods of the year, as well as evaluate the behavior and calibration of this equation throughout the year in the municipality of Jaíba-MG, Brazil. The daily meteorological...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Metereologia Agrícola evapotranspiration; Irrigation scheduling; Missing data; Temperature.
Ano: 2017
URL: http://www.seer.ufv.br/seer/index.php/reveng/article/view/838

Qualidade fisiológica de sementes de milho sob diferentes condições de  armazenamento
Provedor de dados: 22
Autores: E. V. de Carvalho; Universidade Federal do Tocantins; S. C. Siebeneichler; Universidade Federal do Tocantins; W. L. Matos; Universidade Federal do Tocantins; R. P.L. dos Santos; Universidade Federal do Tocantins.
O objetivo deste trabalho foi avaliar a qualidade de sementes de milho armazenadas em diferentes condi&amp;ccedil;&amp;otilde;es, durante os meses de maio a outubro de 2008. O experimento foi conduzido no Laborat&amp;oacute;rio de Pesquisa em An&amp;aacute;lise de Sementes do Campus Universit&amp;aacute;rio de Gurupi&amp;nbsp; -&amp;nbsp; TO, da Universidade Federal do Tocantins, utilizando-se sementes de cultivares comerciais de milho obtidas na gera&amp;ccedil;&amp;atilde;o F2, armazenadas em condi&amp;ccedil;&amp;otilde;es ambientais do estado do Tocantins, e em c&amp;acirc;mara fria (20 &amp;deg;C, e umidade relativa de 20%). Utilizou-se solu&amp;ccedil;&amp;otilde;es de cloreto de pot&amp;aacute;ssio (KCl) para a obten&amp;ccedil;&amp;atilde;o do...
Tipo: Artigo Avaliado por Pares
Palavras-chave: Temperature; Salt concentration; Zea mays; Analysis of seeds.
Ano: 2011
URL: http://e-revista.unioeste.br/index.php/scientiaagraria/article/view/5261

Climatic risk for potato late blight in the Andes region of Venezuela
Provedor de dados: 63
Autores: Garcia,Beatriz Ibet Lozada; Sentelhas,Paulo Cesar; Tapia,Luciano Roberto; Sparovek,Gerd.
Potato is an important crop for Venezuelan agriculture. However, its production is highly affected by late blight (Phytophtora infestans), since weather is commonly favorable for this disease. The aim of this study was to determine the sowing dates of low climatic risk for potato late blight in the Andes region of Venezuela, with an agrometeorological disease model and geographical information system (GIS) tools. The disease model used in this study was developed by Hyre (1954) which requires daily rainfall and temperature data which were obtained from 106 weather stations, located at the States of Mérida, Táchira, and Trujillo, for a period of 31 years. Hyre's model was applied for all stations obtainig the following variables: number of disease favorable...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phytophtora infestans; Hyre's model; Temperature; Rainfall.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000700007

Temperature effect on CARBON biomass in soils FROM TROPICAL AND TEMPERATE REGIONS
Provedor de dados: 63
Autores: Vasconcellos,C.A.
Four soils from various origins, (tropical and temperate regions) were amended with 14C labelled glucose (1mg C.g-1 soil) and incubated at 15ºC and 35ºC to determine the temperature effect on the carbon turnover and on the microbial biomass. The temperature effect on the biomass increased with the glucose addition. The biomass mineralization rates were higher at 35ºC than at 15ºC and higher for Woburn and Pegwell soils (temperate region) than for Capinopolis and Janauba (tropical region). Specific respiration rate (SRR) of new biomass (from glucose) and old biomass showed different behaviors between soils. At 15ºC, the turnover C was 207, 225, 115 and 141 days for Janauba, Capinopolis, Woburn and Pegwell soil, respectively. At 35ºC, it was 92, 69, 69 and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carbon biomass; Organic carbon; Soil; Temperature; Turnover.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000100016

Improving predictions of leaf appearance in field grown potato
Provedor de dados: 63
Autores: Streck,Nereu Augusto; Lago,Isabel; Paula,Fabiana Luiza Matielo de; Bisognin,Dilson Antônio; Heldwein,Arno Bernardo.
The calculation of leaf appearance rate (LAR) and number of accumulated or emerged leaves (NL) on the main stem are part of many crop simulation models. The purpose of this study was to adapt and evaluate a model (WE model) for simulating the main stem LAR and NL in potato (Solanum tuberosum L.). The WE model is a non-linear multiplicative model that takes into account the effect of genotype and environmental factors on LAR. A linear model (Phyllochron model) was also used as a comparison with the WE model. A series of field experiments with 14 planting dates over two years (2003 and 2004) was carried out in Santa Maria, RS, Brazil, using the cultivar Asterix. Coefficients of the WE model and the phyllochron model were estimated with data from four...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Modeling; Temperature; Leaf development; Phyllochron.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000100002

Seasonal fluctuations of bacterial population and microbial activity in soils cultivated with eucalyptus and pinus
Provedor de dados: 63
Autores: Rigobelo,Everlon Cid; Nahas,Ely.
The accumulation and decomposition of litter in soils under forests depend on climatic and biotic conditions. This work evaluated the effect of monthly rainfall and temperature on total bacteria, and on the dehydrogenase and respiration microbial activities. The effects of organic matter, total organic C and soil moisture were also evaluated. Performed from April, 1999 to March, 2000 in an Eucalyptus-cultivated and Pinus-cultivated Oxisol (Typic Haplustox), the study showed that climate and the soil variables affect the total number of bacteria and the microbial activities. The highest air temperatures and rainfall intensities were found during the Summer and, consequently, all the studied variables were maximal during this period. Minimal values varied...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: MPN; Dehydrogenase; Microbial respiration; Litter; Temperature.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000100015

Scheduling optimum planting window for gladiola based on El Niño Southern Oscillation
Provedor de dados: 63
Autores: Becker,Camila Coelho; Streck,Nereu Augusto; Uhlmann,Lilian Osmari; Silveira,Waleska Bolson.
ABSTRACT: Gladiola is an important cut flower worldwide and scheduling field gladiola production is largely dependent on planting at the correct time since its development is controlled by the air temperature. The aim of this study was to configure a planting window of gladiola in order to harvest spikes to be sold on All Souls' Day and Mother's Day holidays in the state of Rio Grande do Sul, Brazil, taking into account the El Niño Southern Oscillation (ENSO) phases. The PhenoGlad model, a dynamic process-based simulation model that simulates gladiola phenology on a daily time step was used in this study. Daily minimum and maximum temperatures over 55 years (1961-2015) from 18 weather stations across Rio Grande do Sul state, Brazil, were used as input data...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: PhenoGlad; Peaks of consumption; Scheduling flowering; Temperature; Target date.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000500301

Morphomolecular characterization of Pleurotus ostreatus (Jacq. Fr.) kummer strains in relation to luminosity and temperature of frutification
Provedor de dados: 63
Autores: Marino,Regina Helena; Eira,Augusto Ferreira da; Kuramae,Eiko Eurya; Queiroz,Elvio Cardoso.
Temperature is one of the main factors affecting mushrooms development and introduction in new areas. Effects of temperature (15ºC and 28ºC) and luminosity (120 and 900 lux) were evaluated for eight P. ostreatus strains in relation to precocity, yield, pileus area, stalk formation pattern, coloration and handling resistance. Genetic variability of strains was analysed by the Random Amplified Polymorphic DNA (RAPD) method. The Pos 98/37 strain was the only to yield white pileus at 28ºC - 900 lux, and grey ones at 15ºC and 120 lux. The Pos 96/05 strain, the latest, produced lead-coloured pileus at 15ºC, as did the remaining strains at this temperature. Strains cultivated at 15ºC did not differ in relation to handling resistance. At 28ºC mushrooms were less...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mushrooms; Temperature; Morphology of basidiocarps; Yield and marked RAPD.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000300018

Climatic risk of grape downy mildew (Plasmopara viticola) for the State of São Paulo, Brazil
Provedor de dados: 63
Autores: Hamada,Emília; Ghini,Raquel; Rossi,Paulo; Pedro Júnior,Mário José; Fernandes,Jeferson Lobato.
Viticulture in Brazil has been growing in importance in recent years. In the State of São Paulo, a significant percentage of the production is basically destined to in natura consumption and, more recently, much effort has been made by institutions to revitalize the viticulture in the State. Among fungal diseases, the downy mildew (Plasmopara viticola) is one of the main diseases affecting this crop in Brazil, with extreme damage effects on its production. The objective of this study was to estimate the incidence of the downy mildew on grape under the climatic conditions of the State of São Paulo, based on a mathematical model and using Geographical Information System - GIS tools. The study considered the months from September to April, a period in which...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis spp.; Geographical Information System; Temperature; Relative humidity; Leaf wetness duration.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000700010

Agrometeorology and plant disease management: a happy marriage
Provedor de dados: 63
Autores: Gillespie,Terry James; Sentelhas,Paulo Cesar.
Many plant disease outbreaks are triggered by suitably warm temperatures during periods of leaf wetness. Measurements or estimations of leaf wetness duration provided by Agrometeorologists have allowed Plant Pathologists to devise weather timed spray schemes which often reduce the number of sprays required to control plant diseases, thus lowering costs and benefitting the environment. In the near future, tools such as numerical weather models with small grid spacings, and improved weather radar, are expected to reduce the need for tight networks of surface observations. The weather models will also provide growers with forecast warnings of potential upcoming disease outbreaks, which will further enhance the contribution of agrometeorology to plant disease...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leaf wetness duration; Temperature; Disease warning systems.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000700012

Hydrothermal treatment favors peeling of 'Pera' sweet orange fruit and does not alter quality
Provedor de dados: 63
Autores: Arruda,Maria Cecília de; Jacomino,Angelo Pedro; Pinheiro,Ana Luíza; Ribeiro,Rafael Vasconcelos; Lochoski,Michelle Antonio; Moreira,Raquel Capistrano.
Consumer demand for ready-to-eat-products has stimulated the development of new processing techniques to prepare fresh-cut fruit and vegetables. The aim of this study was to propose a peeling method for 'Pera' oranges (Citrus sinensis [L.] Osb.) by using a hydrothermal treatment and to determine its influence on the respiratory activity, physicochemical and sensorial characteristics, as well as on the peeling time. Cooled oranges (6ºC) were immersed in heated water (50ºC) for eight minutes and then, peeled and stored at 6ºC. The internal fruit temperatures taken at 1 and 3 cm depths (from fruit surface) were 15ºC and 10ºC, respectively, at the end of the hydrothermal treatment. Non-hydrothermally-treated peeled oranges were used as control. The peeling...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus sinensis; Fresh-cut; Temperature.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000200007

อิทธิพลของสภาพแวดล้อมต่อความแปรปรวนของลักษณะประจำพันธุ์ข้าวไม่ไวต่อช่วงแสง
Provedor de dados: 106
Autores: Pichatorn Ruangdej; Nutthapun Pinkum; Precha Punyaphong; Jarat Singkee.
Effect of climate change on rice growth and yield had been studied during January 2011 through October 2013 at Chiang mai Rice Research Center, Chiang mai Province. Experimental design was split plot with three replications. Main plot were planting dates in each month as planting at January (stage1) April (stage2) July (stage3) and October (stage4). Sub plots were rice varieties, consisting of Plathumtani 1, Phitsanulok 2, RD31 and RD41. The research found that the climate change under stress of environmental. Effect to the rice varieties as a permanent. Planting in January in 2011, temperature in the night less than 15 degree and between the day temperature more than 30 degree effect to plant height of Plathumtani 1 and effect to germination of rice seed....
Tipo: PhysicalObject
Palavras-chave: Rice; Rice production; Non photosensitive rice; Climatatic change; Global warming; Phitsanulok 2 variety; Plathumtani 1 variety; RD 31 variety; RD 41 variety; Growth affect; Characteristic; Variance; Temperature; Season; ข้าว; การผลิตข้าว; ความเปลี่ยนแปลงของภูมิอากาศ; พันธุ์ข้าวไม่ไวต่อช่วงแสง; พันธุ์พิษณุโลก 2; พันธุ์ปทุมธานี 1; พันธุ์กข 31; พันธุ์กข 41; การปลูกปักดำ; สภาพแวดล้อม; ลักษณะประจําพันธุ์; ความแปรปรวน; อุณหภูมิ; ฤดูกาล; การเจริญเติบโต; ผลผลิต; ภาวะโลกร้อน.
Ano: 2014
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5699

การพัฒนาการเลี้ยงผีเสื้อข้าวสารเพื่อการผลิตแตนเบียนไข่ Trichogramma spp.
Provedor de dados: 106
Autores: Winipa Chaleecan; Nutcharee Siri.
Tipo: PhysicalObject
Palavras-chave: Rice moth; Corcyra cephalonica; Stainton; Trichogramma; Egg parasitoid; Rearing; Temperature; Animal feeding; Egg yields; Egg size; Hatching; Parasitism; ผีเสื้อข้าวสาร; แตนเบียนไข่; การเลี้ยงผีเสื้อ; การผลิตไข่; อุณหภูมิ; การให้อาหาร; การวางไข่; ขนาดไข่; การฟักไข่; ประสิทธิภาพการเบียน.
Ano: 2012
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5822

การขจัดความฝาดในผลพลับ (Diospyros kaki L.) ด้วยแก๊สคาร์บอนไดออกไซด์และการเก็บรักษา
Provedor de dados: 106
Autores: Manit Kosittrakun.
Thesis (M.Sc. in Agriculture)
Tipo: PhysicalObject
Palavras-chave: Persimmon; Kaki; Astringency removal; Carbon dioxide treatment; Storage; Temperature; Packaging containers; Quality; Flesh firmness; Soluble solids; พลับ; การขจัดความฝาด; แก๊สคาร์บอนไดออกไซด์; การเก็บรักษา; อุณหภูมิ; ภาชนะบรรจุ; คุณภาพการเก็บรักษา; ความแน่นของเนื้อ; ความฝาด; การสูญเสียน้ำหนัก; รสชาติ; ของแข็งละลายน้ำ.
Ano: 1982
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5499

กระบวนการลดอุณหภูมิแบบสุญญากาศของผักกาดหวาน (Lactuca sativa var. longefolla)
Provedor de dados: 106
Autores: Thitipong Panyakham; Danai Boonyakiat; Pichaya Boonprasoom Poonlarp.
Research was aimed at studying the optimum vacuum cooling process of cos lettuce precooled from initial core temperature of 19-21 °C to the final core temperature of 4±1 °C. The experiment was carried out in a rectangular vacuum chamber having a volume of 14.98 m3. In the experiment, the final pressures for vacuum-cooled cos lettuce were set at three different levels namely, 5.5, 6.0 and 6.5 millibar. The ressures were were at the final pressure of 0.60 kPa and the holding time of 25 minutes. The total cooling time was 39 minutes and the energy consumption was 4.17 kwh per 200 kilograms of cos lettuce. The electricity cost was 0.067 baht per kilogram of fresh weight. The weight loss during precooled cos lettuce with the previous optimum parameters was...
Tipo: Collection
Palavras-chave: Vacuum cooling; Cos lettuce; Temperature; Weight loss; ผักกาดหวาน; การลดอุณหภูมิโดยใช้ระบบสุญญากาศ; อุณหภูมิ; ความดัน; การสูญเสียน้ำหนัก.
Ano: 2011
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5184

การเร่งอายุเมล็ดพันธุ์ข้าวเพื่อประเมินอายุการเก็บรักษาในเขตร้อนชื้น
Provedor de dados: 106
Autores: Marisa Songkrairat; Anchalee Prasertsak.
Rice seed accelerated aging for longevity evaluation in humid tropic was conducted in order to study the temperature and optimum duration for evaluation of seed longivity at Krabi Rice Research Center during 2012-2013. Rice seeds from rice planted in both wet and dry seasons were used. By storing the rice seeds in plastic bags at room temperature and every month rice seeds were monitored and quality testing, another part seeds were aged in nearly 100 percent  relative humidity at 40, 42, 44 and 46 0C for 24, 48, 72 and 96 hours. Seed germination from each temperature and time accelerated aging was correlated to seed stored in plastic bags at room temperature. The result showed that rice seed at moisture content below 12 percent in plastic bag could be...
Tipo: PhysicalObject
Palavras-chave: Rice seed; Accelerated aging; Shelf life; Longevity; Temperature; Seed quality; Krabi province; Humid tropical; เมล็ดพันธุ์ข้าว; พันธุ์ปทุมธานี 1; การเก็บรักษาเมล็ดพันธุ์; อายุการเก็บรักษา; การทำนาย; การเร่งอายุ; คุณภาพเมล็ดพันธุ์; จังหวัดกระบี่; เขตร้อนชื้น.
Ano: 2014
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5662

อิทธิพลของสภาพแวดล้อมต่อความแปรปรวนของลักษณะประจำพันธุ์ข้าวไม่ไวต่อช่วงแสง
Provedor de dados: 106
Autores: Prachack Lengbumrung; Kittima Raksopa; Charoen Thongraya; Wanchai Rojanahusdin; Anchalee Prasertsak.
Study on effect of environment on four rice planting durations (January, April, July and October) and four rice varieties (PTT1, PSL2, RD31 and RD41) was conducted at Ratchaburi Rice Research Center in 2011.  The experimental design was split plot in RCB with three replications.  Varietal characteristics, yield, yield component and meteorological data were recorded. PTT1 variety showed the longest maturity (128 days).  Rice planting in April showed higher yield (808 kg/rai) than that planting in other durations.  In addition, planting in April also showed the highest panicle length, number of filled seeds/panicle and 1,000 seed weight. The longest harvesting period (123 days) and lowest yield (510 kg/rai) was found in October planting.  This could be...
Tipo: PhysicalObject
Palavras-chave: Rice; Rice production; Non photosensitive rice; Climatatic change; Global warming; Phitsanulok 2 variety; Plathumtani 1 variety; RD 31 variety; RD 41 variety; Growth affect; Characteristic; Variance; Temperature; Season; Planting date; Rice seed; ข้าว; การผลิตข้าว; สภาพแวดล้อม; พันธุ์ข้าวไม่ไวต่อช่วงแสง; พันธุ์พิษณุโลก 2; พันธุ์ปทุมธานี 1; พันธุ์กข 31; พันธุ์กข 41; การปลูกปักดำ; การเปลี่ยนแปลงสภาพภูมิอากาศ; ลักษณะประจําพันธุ์; ความแปรปรวน; อุณหภูมิ; ฤดูกาล; การเจริญเติบโต; ผลผลิต; ภาวะโลกร้อน; เมล็ดพันธุ์.
Ano: 2013
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5700

ผลของวิธีการเก็บรักษาไข่อาศัยต่อการเบียนของแตนเบียนไข่ Trichogramma spp.
Provedor de dados: 106
Autores: Winipa Chaleecan; Nutcharee Siri.
The parasitoid, Trichogramma spp. was produced using the rice moth eggs Corcyra cephalonica as host. Thus, the study of storage methods was done for the right timing of the parasitoid application during the pest out break. Various storage methods were studied by comparing different set of packed eggs in tissue paper and fire mesh, and unpacked eggs. The eggs were then stored at 5±2°C and 7±2°C for 1-4 weeks. The interaction between temperatures and packing methods resulted in the reduction of egg weight. At 5±2°C reduced fewer egg weight and more larval emergence than that at 7±2°C. Additional emergences were found more in packing eggs with tissue paper than fine mesh and unpacked. The one week storage eggs at both temperatures showed more than 80%...
Tipo: PhysicalObject
Palavras-chave: Rice moth; Corcyra cephalonica; Stainton; Trichogramma; Egg parasitoid; Egg storage; Temperature; Packing eggs; Parasitism; ผีเสื้อข้าวสาร; แตนเบียนไข่; วิธีการเก็บรักษา; การรักษาคุณภาพ; อุณหภูมิ; การห่อไข่; การฟัก; อัตราการรอด; ประสิทธิภาพการเบียน.
Ano: 2013
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5797

ผลของการใช้อุณหภูมิสูงในการอบลดความชื้นต่ออายุการเก็บรักษาของเมล็ดพันธุ์ข้าว
Provedor de dados: 106
Autores: Wilai Palawisut; Duangorn Ariyapruek; Pornsuree Kanjana.
Seed drying is one of the most important processes of seed production in rice. The purpose for reduce seed moisture without any effects on seed quality. The continuous-flow drier need higher temperature than bacth drier for increased drying rate was used in this experiment. In2008 at Pichit province, Five Experiments were conducted on 12 tons continuous-flow driers to find out the effected of temperature on quality of PSL2 and RD29 rice seed under different levels of temperature including 45, 50, 55 45 followed by 50 and 50 followed by 55°c compared with sun drying method. In2009 at Suphan Buri province, PSL2 rice seeds were used on 30 tons ontinuous-flow driers to study in two experiments. First experiment 3 levels of temperature including 45, 50, 55°c...
Tipo: Collection
Palavras-chave: Rice seeds; Temperature; Storability; Seed quality; ข้าว; การเก็บรักษาของเมล็ดพันธุ์; การลดความชื้นของเมล็ด; อุณหภูมิ; เครื่องอบ; ความแข็งแรงของเมล็ด.
Ano: 2011
URL: http://anchan.lib.ku.ac.th/agnet/handle/123456789/3100

Distribution of polycaprolactone (PCL) degrading microorganisms and degradation at high temperature
Provedor de dados: 106
Autores: Jarerat, A.; Sriroth, K.
Palavras-chave: Temperature; Microorganisms; Polycaprolactone.
Ano: 1997
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/4843

ผลของอุณหภูมิต่อแมลงพาหะ Matsumuratettix hiroglyphicus นำโรคใบขาวอ้อย
Provedor de dados: 106
Autores: Chananat Kaewmanee; Yupa Hanboonsong; Tasanee Jamjanya.
Tipo: PhysicalObject
Palavras-chave: Leafhopper; Matsumuratettix hiroglyphicus; Insect vectors; Phytoplasma; Sugarcane white leaf disease; SCWL; Temperature; Reproduction; Multiplication; Disease transmission efficiency; Disease outbreak; Sugarcane; เพลี้ยจักจั่น; แมลงพาหะนำโรค; เชื้อไฟโตพลาสมา; โรคใบขาวอ้อย; อุณหภูมิ; การเจริญพันธุ์ของแมลงพาหะ; การเจริญเติบโตของเชื้อโรค; การถ่ายทอดเชื้อโรค; อ้อย; การระบาดของแมลงพาหะ; การแพร่กระจายเชื้อโรค.
Ano: 2012
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5821

ผลของการเปลี่ยนแปลงสภาพภูมิอากาศต่อการระบาดของโรคข้าว จังหวัดเชียงรายและพะเยา
Provedor de dados: 106
Autores: Nootjarin Jungkhun; Piyapa Srikhom; Konsiri Srinil; Taraporn Yuneyong; Kanteera Kanta.
Main objective of this study was to evaluate the relationship between climate changes and rice disease s epidemics in Chiangrai and Phayao provinces. The study was conducted at Chiangrai Rice Research Center during the year 2011-2013 by monthly broadcasting two popular rice varieties in the area; Phitsanulok 2 and Sanpatong 1. The experiment was carried out in Split plot in RCB Design with 3 replicates having month as main plot and variety as sub-plot. Disease incidence and severity were evaluated at 3 growth stages i.e. 20, 50 and 90 days after sowing. Concurrently, Disease incidence and severity were recorded for rice diseases in the farmers’ fields of Chiangrai and Phayao provinces having infected at 10 rai and above. Disease data showed that both rice...
Tipo: PhysicalObject
Palavras-chave: Climate change; Temperature; Relative humidity; Rainfall; Rice disease; Epidemic; Global warming; Rice pathogen; Rice; Rice production; Phitsanulok 2 variety; Sanpatong 1 variety; Plant diseases survey; Pathogens; Chiangrai province; Phayao province; ข้าว; พันธุ์พิษณุโลก 2; พันธุ์สันป่าตอง 1; การผลิตข้าว; การสำรวจโรคพืช; โรคข้าว; เชื้อสาเหตุของโรค; การระบาดของโรค; ภาวะโลกร้อน; การเปลี่ยนแปลงสภาพภูมิอากาศ; อุณหภูมิ; ความชื้นสัมพัทธ์; ปริมาณน้ำฝน; การประเมินความเสียหาย; จ.เชียงราย; จ.พะเยา.
Ano: 2014
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5695

Critical thermal maxima and minima of the platyfish Xiphophorus maculatus Günther (Poecillidae, Cyprinodontiformes): a tropical species of ornamental freshwater fish
Provedor de dados: 104
Autores: Prodocimo,Viviane; Freire,Carolina Arruda.
Temperature as an environmental factor has been a frequent subject of study, since it affects either directly or indirectly all living organisms. The determination of thermal limits (critical thermal minima - CTmin and maxima - CTmax) for the tropical ornamental freshwater teleost Xiphophorus maculatus Günther, 1866 (platyfish) was performed after their acclimation to the following temperatures: 15, 20, 25, and 30ºC, for seven days. After this period, the water temperature was elevated or reduced at a rate of 0.125ºC/min until CTmax and CTmin could be determined as the temperature at which 50% of the animals had lost equilibrium. Mean values for CTmax and CTmin for the acclimation temperatures of 15, 20, 25, and 30ºC were respectively:...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Xiphophorus maculatus; Temperature; Critical thermal maxima and minima; Acclimation; Platyfish.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752001000500007

Behaviour and orcadian rhythm of the fish bathygobius soporator Valenciennes (Gobiidae) under the influence of environmental salinity and temperature
Provedor de dados: 104
Autores: Fanta,Edith.
The behavioural patterns and their cireadian rhythms may be adaptive to the peculiar environmental conditions of subtropical brackish waters where Ba-thygobius soporator Valenciennes, 1837 live. Adult fish were caught at the southern Brazilian coast from mangrove rivers and rocky shores in a bay, where temperature and water salinity vary during the day and through the year. Observation on the behaviour of the animals was undertaken in salinity 8.5ppt, 17.0ppt, 25.5ppt and 34.0ppt, each one in temperatures of 18ºC and 28ºC. Temperature and salinity affect the frequency and intensity of some of the behavioural events, more than its pattern or rhythm. Swimming is rare, decreasing along the day and with temperature increase, being even lower at low salinity;...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bathygobius soporator; Fish; Behaviour; Cireadian rhythm; Salinity; Temperature.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751997000100021

A conceptual model to describe heat stress in dairy cows from actual to questionable loops
Provedor de dados: 109
Autores: Molina Benavides,Raúl Andrés; Sánchez Guerrero,Hugo; Atzori,Alberto Stanislao.
Abstract Thermal environment is recognized to be one the most important ecological factor to determine domestic animal growth, development and productivity for direct and indirect effects on its physiology and behavior. Despite having specific and individual adaptation, is very common, within seasonal or diurnal temperature variations, animals deal with situations outside their thermal comfort zone. Due to heat stress, dairy cows reduce milk production and fertility, and therefore, had achieved an increasing in metabolic disorders incidence, causing low revenues to farm in short and medium periods. Due to world climate change more impact of the meteorological variables on animal responses is expected for the future. This study aimed to describe and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Climate change; Grazing; Livestock production systems; Milk production; System dynamics; Temperature.
Ano: 2018
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122018000100059

Population fluctuation of fruit fly Anastrepha spp. (Díptera: Tephritidae) in guava (Psidium guajava L.) accesses produced in organic system
Provedor de dados: 109
Autores: Galli,Juliana Altafin; Michelotto,Marcos Doniseti; Bernardes-Soares,Maria Beatriz; Mello-Martins,Antonio Lucio; Fischer,Ivan Herman.
Abstract Guava   (Psidium guajava L.) presented prominence among the tropical fruit. Guava exports are still unimpressive, because of the quarantine pests, among them the fruit flies. The present research had as objective to evaluate the population fluctuation of fruit flies Anastrepha spp. and the fruits infestation caused in guava accesses cultivated in organic system, and study the possible correlations between this pest and meteorological factors. To estimate population fluctuation, 20 yellow sticky traps were used. The reviews were initiated in April 2013, for 378 days. The traps were kept in the field for the entire duration of the experiment, and they were reviewed every 14 days in most cases, during replacement of traps for new ones. With the data,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Psidium guajava; Precipitation; Temperature; Varietal resistance.
Ano: 2019
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122019000100009

Postharvest quality of strawberry (Fragaria χ ananassa (Duchesne ex Weston) Duchesne ex Rozier) genotypes according to vernalization
Provedor de dados: 109
Autores: Santacruz Oviedo,Victoria Rossmary; Cabral,Moisés; Enciso Garay,Cipriano Ramón; de Jesús Cabrera Arredondo,Graciela Antonia.
Abstract Strawberry production in Paraguay is carried out by small producers, using minimal technology and obtaining low productivity, with the need to expand strawberry genotypes and production techniques. The aim of this study was to evaluate fruit quality of strawberry genotypes according to vernalization. A randomized block design with factorial arrangement 14x2 was performed; factors were genotypes and chilling using 15 plants per treatment and three replicates. Plants were kept in cold room at 5°C, with 8 hours of artificial light and 16 of darkness for a period of 25 days. Five fruits were used per treatment and were evaluated as follows: the amount of total soluble solids, titratable acidity and ratio of total soluble solids to titratable acidity,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citric acid; Mass loss; Temperature; Total soluble solids; Titratable acidity.
Ano: 2018
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122018000200208

Preliminary observations on the effect of sudden changes of temperature on survival of young Matrinxã (Brycon cephalus) under laboratory conditions
Provedor de dados: 36
Autores: Guimarães,Sérgio Fonsêca; Storti Filho,Atílio.
Matrinxã is a very promising amazonian fish for fish culture in Brazil. This study is aimed at determining the approximate tolerated temperature range in this species. Groups of ten young matrinxã specimens (15.1±0.8 cm average length and 58.3±10.3 g average weight) were subjected to 9 different temperatures for 24 hours without previous acclimation. Fish were transferred from an initial temperature of 27ºC to those ranging from 12 to 39ºC at 3ºC intervals. Both 12ºC and 39ºC temperatures were lethal for this species with 100% mortality rate. Following 2 minutes of exposure to 39ºC fish changed behavior, showing an increase in opercular movements and erratic swimming; mortality reached 100% after 18 minutes. At 12ºC, fish lost equilibrium immediately after...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Matrinxã; Brycon cephalus; Temperature; Thermal tolerance.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672003000400018

TEMPORAL VARIATION IN THE ABUNDANCE OF Poblana alchichica IN NEAR-SHORE HABITAT OF THE HIGH ELEVATION LAKE, LAGO DE ALCHICHICA, PUEBLA, MEXICO
Provedor de dados: 37
Autores: WOOLRICH-PIÑA,GUILLERMO A; GEOFFREY R,SMITH; LEMOS-ESPINAL,JULIO A; MONTOYA-AYALA,RAYMUNDO; ÁVILABOCANEGRA,LUIS E; BENAVIDES GARDUÑO,EDUARDO.
The distribution and abundance of organisms within a pond or lake can reflect the result of a variety of factors. We examined the abundance of the endemic fish, Poblana alchichica, in Lago de Alchichica, Puebla, Mexico, as well as how the abundance varied among months. Dissolved oxygen, temperature, and salinity varied among months. The abundance of Poblana alchichica peaked in December and February. For the months when fish were observed, their abundances were positively related to dissolved oxygen concentration and were generally not related to temperature. Our results provide evidence that there is substantial seasonal variation in the abundances of Poblana alchichica and that within months, their distributions are likely driven by dissolved oxygen than...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abundance; Dissolved oxygen; Poblana alchichica; Salinity; Seasonal variation; Temperature.
Ano: 2012
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2012000100015

Photosynthetic characteristics of the freshwater red alga Batrachospermum delicatulum (Skuja) Necchi &amp;amp; Entwisle
Provedor de dados: 39
Autores: Necchi Júnior,Orlando; Alves,Abner H.S.
Six populations of the freshwater red alga Batrachospermum delicatulum (Skuja) Necchi &amp;amp; Entwisle, including gametophyte and 'Chantransia' stage, were analysed in culture and natural conditions applying chlorophyll fluorescence and oxygen evolution. Parameters derived from the photosynthesis-irradiance curves indicated adaptation to low irradiance for all populations, which was characterized by photoinhibition, low values of Ik and Ic and high values of a. Data from both techniques revealed significant differences among populations and phases for most photosynthetic parameters. Similarly, photosynthesis responded differently to variations in temperature in each population with similar rates under a wide range of temperature. No consistent pattern...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Batrachospermum; Photosynthesis; Irradiance; PH; Diurnal rhythm; Temperature.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062005000100012

Global warming decreases the morphological traits of germination and environmental suitability of Dipteryx alata (Fabaceae) in Brazilian Cerrado
Provedor de dados: 39
Autores: Ribeiro,Raquel Menestrino; Tessarolo,Geizianne; Soares,Thannya Nascimento; Teixeira,Itamar Rosa; Nabout,João Carlos.
ABSTRACT We experimentally evaluated how different temperatures affect germination of individual seedlings of Dipteryx alata, and estimated the impact of climate change on the species using ecological niche modeling. A total of 240 seeds were randomly distributed among three different temperature treatments (32 ºC, 36 ºC, and 40 ºC), and monitored for 35 days. We measured seven seed traits and estimated the ecological niche of D. alata using a consensus of four methods. The treatment with the highest temperature produced smaller and lighter seedlings. The consensus of ecological niche modeling indicated that are expected to reduce the areas with climates favorable for D. alata in future scenarios. Thus, our two results (experiment and ecological niche...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Climatic scenarios; Germination; Global climate change; Ecological niche model; Temperature.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062019000300446

Effects of chemical treatments and environmental factors on seed dormancy and germination of shepherd's purse (Capsella bursa-pastoris (L.) Medic.)
Provedor de dados: 39
Autores: Rezvani,Mohammad; Zaefarian,Faezeh; Amini,Vajihe.
Shepherd's purse (Capsella bursa-pastoris) is a problematic weed in citrus orchards and crop fields in northern Iran. In a series of laboratory and greenhouse experiments, we evaluated the effects that treatment with gibberellic acid (GA3) and potassium nitrate (KNO3), as well as environmental factors, including temperature, the duration of pre-chilling (wet and dry), drought stress, salt stress, pH, and sowing depth, have on seed dormancy breaking and germination in C. bursa-pastoris. Treatment with GA3 strongly stimulated germination of C. bursa-pastoris in conditions of light/dark and continuous darkness. The germination rate was highest (40.08%) for seeds treated with 400 ppm of GA3 in the light/dark condition. Treatment with KNO3 did not significantly...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Drought and salt stress; Gibberellic acid; Light; Temperature; Sowing depth.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062014000400002

Light and temperature requirements for germination of seeds of Aechmea nudicaulis (l.) Griesebach and Streptocalyx floribundus (Martius ex Shultes f.) Mez (Bromeliaceae)
Provedor de dados: 39
Autores: Pinheiro,Fernanda; Borghetti,Fabian.
Seeds of A. nudicaulis and S. floribundus were collected in a restinga located at Presidente Kennedy (ES, Brazil). This sandy community is characterized by the presence of patches of vegetation interspersed by open areas with a sparse plant covering. In order to evaluate the capacity of A. nudicaulis and S. floribundus to recruit individuals from seeds in the distinct microclimates generated by this heterogeneous plant covering, experiments were conducted in laboratory to test the effects of light and temperature on the germination for both species. Seeds of A. nudicaulis were unable to germinate in darkness but they achieved high germinability (≥90%) from 15 to 40°C under red light. Seeds of S. floribundus germinated in darkness only at 40ºC (22.5%),...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aechmea nudicaulis; Streptocalyx floribundus; Restinga; Seed germination; Temperature.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062003000100003

Responses of quinoa (Chenopodium quinoa Willd.) seeds stored under different germination temperatures
Provedor de dados: 1
Autores: Strenske, Andressa; Vasconcelos, Edmar Soares de; Egewarth, Vanessa Aline; Herzog, Neusa Francisca Michelon; Malavasi, Marlene de Matos.
In this experiment, we assessed the germination and vigor of quinoa seeds packed in paper bags and stored at room temperature for 36, 85, 119, 146, 177 and 270 days. The seeds were harvested under experimental conditions in Marechal Candido Rondon, Paraná, during the 2012/13 growing seasons. Four replicates of 100 seeds each were established for each storage time, and the seeds were evaluated, on paper, based on the BOD under the following experimental temperature conditions: alternating temperatures of 20 and 30°C and a constant temperature of 25°C. The seeds from both treatments were subject to seven-hour photoperiods and 25°C under continuous darkness. The germinated seeds were counted daily for eight days after sowing, and we evaluated the percentages...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 5.01.03.03-2 Germination test; Temperature; Photoperiod; Seed vigor Produção e Beneficiamento de Sementes.
Ano: 2017
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/30989

Vegetative growth of Conilon coffee plants under two water conditions in the Atlantic region of Bahia State, Brazil
Provedor de dados: 1
Autores: Covre, André Monzoli; Partelli, Fábio Luiz; Bonomo, Robson; Braun, Heder; Ronchi, Cláudio Pagotto.
Extreme temperatures and persistent water stress stand out among the main factors that restrict the vegetative growth and productivity of Coffea canephora. The objective of this study was to evaluate the vegetative growth of orthotropic and plagiotropic branches of C. canephora under non-irrigated and irrigated conditions, and their correlation with climatic factors in the Atlantic region of Bahia State, Brazil. The experiment was established with two treatments (non-irrigated and irrigated) in a completely random design with 14 replicates. One orthotropic and four plagiotropic branches were labelled on each plant. During the two-year experimental period, the growth of these branches was evaluated at 14-day intervals. Two harvests were performed to obtain...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffea canephora; Water deficit; Temperature; Plagiotropic branches Crescimento vegetativo.
Ano: 2016
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/30627

Qualidade da silagem de grão úmido em função da temperatura ambiente e pressão interna de armazenagem - DOI: 10.4025/actasciagron.v31i3.325
Provedor de dados: 1
Autores: Biaggioni, Marco Antônio Martin; UNESP - Botucatu; Lopes, Ana Beatriz de Castro; UNESP - Botucatu; Jasper, Samir Paulo; UNESP - Botucatu; Berto, Dirlei Antonio; UNESP - Botucatu; Gonçalves, Elisa Vidal; UNESP-Botucatu.
Visando estabelecer a contribuição dos parâmetros físicos na qualidade final da silagem de grãos úmidos de milho, foi conduzido experimento, no interior de câmara climatizada, simulando cinco condições de temperatura ambiente (5&amp;deg;C 24h-1 por dia; 25&amp;deg;C 24h-1 por dia; 40&amp;deg;C 24h-1 por dia; 20&amp;deg;C 16h-1 por dia + 5&amp;deg;C 8h-1 por dia; 30&amp;deg;C 16h-1 por dia + 20&amp;deg;C 8h-1 por dia) e duas condições de pressão no interior dos tambores de armazenagem (com e sem pressão interna). Para se determinar os efeitos sobre o grau de disponibilidade do amido na silagem pronta, procedeu-se a análises para avaliar a qualidade final da silagem (teor de umidade, pH, ácidos orgânicos, amido total e granulometria). O delineamento...
Palavras-chave: 5.01.00.00-9    Agronomia silagem; Qualidade; Temperatura; Pressão silage; Quality; Temperature; Pressure.
Ano: 2009
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/325

Caracterização morfofisiológica e identificação molecular de isolados de Guignardia citricarpa, agente patogênico da mancha preta dos citros - DOI: 10.4025/actasciagron.v30i5.5962
Provedor de dados: 1
Autores: Caixeta, Marilda Pereira; UEM; Corazza, Maria Júlia; UEM; Oliveira, Ricardo Ribeiro de; UEM; Zanutto, Carlos Alexandre; UEM; Nunes, William Mário de Carvalho; UEM; Vida, João Batista; UEM.
O presente trabalho teve como objetivo identificar 11 isolados de Guignardia citricarpa, agente causal da mancha preta dos citros (MPC), obtidos de frutas cítricas sintomáticas de diferentes regiões geográficas, por meio da PCR e caracterização morfofisiológica das estruturas propagativas, esporulação e crescimento micelial em diferentes meios de cultura, temperaturas e regimes de luz, nas condições de laboratório.  Pelo teste de PCR, todos os isolados foram identificados como o patógeno G. citricarpa. Os isolados caracterizados foram submetidos às temperaturas de 20, 25 e 30ºC, em regime de luz contínua, escuro contínuo e fotoperíodos de 12 horas, durante 24 dias. Utilizaram-se os meios de cultura aveia-ágar (AA), batata-dextrose-ágar (BDA) e...
Palavras-chave: 5.01.02.00-1 Fitossanidade G. citricarpa; PCR; Esporulação; Crescimento micelial; Temperatura; Meio de cultura; Fotoperíodo. G. citricarpa; PCR; Sporing; Mycelial growth; Temperature; Mean of culture; Photoperiod.
Ano: 2008
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/5962

The influence of drying on the physiological quality of crambe fruits - doi:  10.4025/actasciagron.v34i2.12482
Provedor de dados: 1
Autores: Costa, Lílian Moreira; Instituto Federal de Educação, Ciência e Tecnologia Goiano - campus Rio Verde – Goiás; Resende, Osvaldo; Instituto Federal de Educação, Ciência e Tecnologia Goiano - campus Rio Verde – Goiás; Gonçalves, Douglas Nascimento; Instituto Federal de Educação, Ciência e Tecnologia Goiano - campus Rio Verde – Goiás; Souza, Kelly Aparecida; Instituto Federal de Educação, Ciência e Tecnologia Goiano - campus Rio Verde – Goiás; Sales, Juliana de Fátima; Instituto Federal de Educação, Ciência e Tecnologia Goiano - campus Rio Verde – Goiás; Donadon, Juliana Rodrigues; Instituto Federal de Educação - campus Rio Verde.
This study was performed to evaluate the physiological quality of Crambe abyssinica Hochst fruits subjected to drying under different treatments with air. The crambe fruits, with moisture content of 21.0 ± 1.3 (% w.b.), were manually collected and dried until their moisture content reached 7.0 ± 1.4 (% w.b.). The crambe fruits were dried with natural air (23°C mean temperature and 60.6% average relative humidity) and seven days after harvest in an experimental dryer with forced ventilation at temperatures of 30, 40, 50, 60 and 70°C and relative humidities of 37.4, 22.3, 14.0, 8.3 and 5.1%, respectively. The evaluation was the percent germination, the germination speed index (GSI), the amount of water absorption and the electrical conductivity. The results...
Palavras-chave: Oilseed; Temperature; Crambe abyssinica Hochst 5.01.03.03-2 Produção e Beneficiamento de Sementes.
Ano: 2012
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/12482

Is curtobacterium wilt biocontrol temperature dependent?
Provedor de dados: 1
Autores: Martins, Samuel Julio; Medeiros, Flavio Henrique Vasconcelos; Souza, Ricardo Magela; Vilela, Laize Aparecida Ferreira.
Abiotic stress interferes with plant-microbial interactions, but some microorganisms may buffer this interference. We investigated the interaction between temperature and bacterial wilt (Curtobacterium flaccumfaciens pv. flaccumfaciens - Cff) biocontrol and the ability of Bacillus subtilis strain ALB629 to colonize bean seedlings, to inhibit pathogen growth and to use different C and N sources. B. subtilis ALB629rif, a mutant selected from the wild population of ALB629, was used to monitor plant colonization at 20°C and 30°C. ALB629rif was detected only in the plant roots (103.22 CFU g-1) at the lower temperature but colonized the roots, stems, and leaves (105.85, 104.48, and 104.01 CFU g-1), respectively, at 30ºC. The area under the disease progress curve...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 5.01.02.01-0 seed treatment; Phaseolus vulgaris; Antibiosis; Temperature; Rhizobacteria; PGPR Fitopatologia.
Ano: 2014
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/18018

Produção de geleia real em colônias de abelhas africanizadas considerando diferentes suplementos proteicos e a influência de fatores ambientais - DOI: 10.4025/actascianimsci.v32i1.6836
Provedor de dados: 2
Autores: Toledo, Vagner de Alencar Arnaut de; UEM; Neves, Carolina Antunes; Copebrás; Alves, Eloi Machado; UEM; Oliveira, Jussara Ricardo de; Universidade Paranaense; Ruvolo-Takasusuki, Maria Cláudia Colla; UEM; Faquinello, Patrícia; UEM.
O objetivo foi avaliar o efeito da suplementação proteica sobre a produção de geleia real em colônias de Apis mellifera e correlacionar esta produção com as variáveis climáticas. Os tratamentos foram: colônias que receberam uma ração elaborada com 35% de proteína; colônias que receberam suplemento proteico comercial com 35% de proteína bruta e colônias que não receberam ração proteica. Não houve diferença (p &gt; 0,05) entre os tratamentos para as variáveis de produção. As médias foram: quantidade de larvas aceitas, 8,56 ± 6,76; porcentagem de aceitação, 29,20 ± 22,03%; quantidade de geleia real produzida por colônia, 1,83 ± 0,82 g e quantidade produzida por cúpula, 213,58 ± 108,36 mg. A precipitação pluviométrica não influenciou (p &gt; 0,05) a produção...
Tipo: Pesquisa de campo
Palavras-chave: 5.04.05.00-4 Apis mellifera; Nutrição de abelhas; Proteína; Umidade relativa; Temperatura 5.04.05.02-0 Apis mellifera; Honeybee nutrition; Protein; Relative humidity; Temperature.
Ano: 2009
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/6836

Circadian changes in thyroid hormones of piau, Leporinus obtusidens Valenciennes, 1847 (Osteichthyes, Anostomidae) after feeding - DOI: 10.4025/actascibiolsci.v31i4.5814
Provedor de dados: 3
Autores: Dias Junior, Walter; Mourgués-Schurter, Lea Rosa; UFLA.
To evaluate circadian changes in thyroid hormones of piau, Leporinus obtusidens Valenciennes, 1847, (Osteichthyes, Anostomidae) after feeding were determined the plasma levels of thyroid hormones (TH) of 128 fishes, same age, immature, both sexes, distributed into four classes of weight. They were kept in 16 aquaria (100 L), with artificial aeration and 2 L min. -1 water flow, from March to August, 1996, in Aquaculture Station of the Universidade Federal de Lavras (UFLA). Daily, feed was supplied at 5% body weight. For blood samples, the fishes were anesthetized with benzocaine 10%, and plasmatic levels of TH were determined at 1, 4, 7, 10, 13, 16 and 22h after food supply during 4 consecutive days in June and in August, period of lowest temperature. The...
Palavras-chave: 2.07.04.00-3 T3  T4; Teleost fish; Temperature; Photoperiod Fisiologia Comparada.
Ano: 2009
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/5814

Resposta das algas perifíticas às alterações de temperatura e ao enriquecimento artificial de nutrientes em curto período de tempo - DOI: 10.4025/actascibiolsci.v31i3.1627
Provedor de dados: 3
Autores: Murakami, Eliza Akane; UEM; Rodrigues, Liliana; UEM.
O estudo visou avaliar, em um experimento de mesocosmos, a influência da temperatura e de concentrações de nutrientes na abundância das algas perifíticas (exceto Bacillariophyceae) na planície de inundação do alto rio Paraná. O delineamento experimental constituiu-se de cinco tratamentos: controle (C) e adição de nutrientes (P+, N+ e NP+) a 25&amp;deg;C, e frio (F) com diminuição da temperatura a 15&amp;deg;C e sem adição de nutrientes. Lâminas de vidro foram utilizadas para colonização das algas perifíticas, e as amostragens foram feitas entre o 15&amp;deg; e o 31&amp;deg; dia de sucessão. Pela Análise de Correspondência Canônica, pode-se observar uma clara separação entre os tratamentos devido à temperatura e adição de nutrientes. A diminuição de...
Palavras-chave: 2.00.00.00-6    Ciências Biológicas algas perifíticas; Enriquecimento artificial; Temperatura; Mesocosmos; Planície de inundação periphytic algae; Artificial enrichment; Temperature; Abundance; Floodplain.
Ano: 2009
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/1627

Germinação de sementes de Dalbergia nigra (Vell.) Fr. All. - doi: 10.4025/actascibiolsci.v33i4.5834
Provedor de dados: 3
Autores: Guedes, Roberta Sales; UNIVERSIDADE FEDERAL DA PARAIBA; Alves, Edna Ursulino; UNIVERSIDADE FEDERAL DA PARAIBA; Gonçalves, Edilma Pereira; UFRPE; França, Pablo Radamés Cabral de; UNIVERSIDADE FEDERAL DA PARAIBA; Moura, Macio Faria de; UNIVERSIDADE FEDERAL DA PARAIBA; Santos, Sueli da Silva; UNIVERSIDADE FEDERAL DA PARAIBA.
Dalbergia nigra (Vell.) Fr. All., conhecida popularmente como jacarandá-da-bahia, é uma espécie bastante conhecida pela exploração da sua madeira. Foi realizado um experimento no Laboratório de Análises de Sementes (CCA/UFPB) Areia, Estado da Paraíba, com o objetivo de determinar metodologia adequada para a condução de testes de germinação e vigor com sementes de D. nigra. O experimento foi conduzido em delineamento inteiramente ao acaso, em esquema fatorial 2 x 7, sendo duas temperaturas (25 e 20-30°C) e sete substratos (entre areia, entre vermiculita, bioplant&amp;reg;, plantmax&amp;reg;, entre e sobre papel mata-borrão e papel toalha), com quatro repetições de 25 sementes cada. As características avaliadas foram: germinação (%), primeira contagem de...
Palavras-chave: 2.03.03.00-9 sementes florestais; Jacarandá-da-bahia; Vigor; Substrato; Temperatura 2.03.03.03-3 forest seeds; Jacarandá-da-bahia; Vigor; Substrate; Temperature.
Ano: 2011
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/5834

Energy and Exergy Analyses during Eggplant Drying in a Fluidized Bed Dryer
Provedor de dados: 111
Autores: Azadbakht, Mohsen; Ziaratban, Armin; Vahedi Torshizi, Mohammad; Aghili, Hajar.
In this research, energy and exergy loss were analyzed in the laboratory for the drying of eggplant using a fluidized bed dryer. The drying experiment was conducted at inlet temperatures of 40, 50, and 60  and air velocities of 3, 5, and 7 m/s using samples with diameters of 5, 10, and 13 mm and a height of 1 cm. The effects of temperature, velocity of drying air, and sample size on energy consumption and exergy losses were investigated. The results showed that the minimum energy consumption and exergy losses occurred at a diameter of 13 mm, velocity of 3 m/s, and temperature of 40. Meanwhile, the maximum energy consumption and exergy losses occurred at diameter of 5 mm, velocity of 7 m/s and temperature of 60;. Generally, the results demonstrated that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Energy utilization; Exergy losses; Eggplant; Fluidized bed dryer; Temperature; Air velocity.
Ano: 2017
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/4116

Effect of physical properties on the specific heat preserved ground sheanut kernel (BUTYROSPERNUMPARADOXUM)
Provedor de dados: 111
Autores: H.U., Nwannewuihe; M. C., Onwukwe; J.C., Edeh; N. I., Nwagugu; J.N., Nwakaire.
Most agricultural materials undergo various forms of preservation in order to enhance shelf life. Sheanut is usually preserved by heating the kernels over fire in a pot for a time period. This affects its properties especially during heat processing. It is expected that this work will provide information that would help optimize such processing. Preserved sheanut kernel samples sourced locally were prepared by manually cleaning, sorting, grinding and sieving to obtain desired particle sizes. The specific heat of the samples were evaluated as a function of particle size (2.36 mm), (1.18 mm and 1.00 mm), moisture content (initial moisture content, 10%, 20%, 30% and 40% db) and temperature (50oC, 60oC, 70oC, 80oC, and 90oC). The specific heat of each particle...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Power system Engineering specific heat; Particle size; Moisture content; Temperature; Sheanut.
Ano: 2016
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3800

Effects of different autoclaving parameters on the nutritional compositions of raw milk samples
Provedor de dados: 111
Autores: OLUSHOLA, SUNMONU MUSLIU; MAYOKUN, ODEWOLE MICHAEL; OLAMIDE, OYEDUN ALIU; OPEYEMI, OLA FUNMILAYO; MUSLIM, HAMID TAYE.
As milk provides a substantial amount of vitamins and minerals in relation to its energy content, it is considered a nutrient dense food The difference and changes in the nutritional compositions (Protein, fat, carbohydrate, moisture content, ash content, fibre content, magnesium and calcium)  of  White Fulani, Sokoto Gudali and mixture of the two breeds were investigated before and after autoclaving  of milk samples in glass, aluminium and stainless steel containers at various temperatures of 1100C,1210Cand 1300C with autoclaving time of 10minutes, 20 minutes and 30 minutes. The heat treatment was done using MA-DONAX YX-280A Vertical Column Autoclave of 18Litre capacity of pressure of 0.14MPa – 0.165MPa. The results were evaluated using ANOVA at p 0.05....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Breeds; Milk; Nutritional; Temperature; Time.
Ano: 2021
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/6147

Effect of moisture and temperature on thermal conductivity of pigeon pea seeds
Provedor de dados: 111
Autores: Ikegwu, Onyekachi John.
The thermal conductivity of agricultural seeds has been used as engineering parameter in the design of process and machines for drying, storing, aeration and refrigeration. The thermal conductivity of white and red pigeon pea seeds with changes in moisture content and temperature was investigated using the transient heat transfer method. The thermal conductivity of white and red pigeon pea seeds increased from 0.2387 to 0.3497 Wm-1k-1 , and 0.2375 to 0.3425 Wm-1k-1 respectively, as the moisture content increased from 5 to 35% w.b. Thermal conductivity of white and red pigeon pea seeds increased significantly (p&amp;lt;0.05) from 0.2643 to 0.3543 Wm-1k-1 , and from 0.2711 to 0.3311 Wm-1k-1 respectively, as temperature increased from 10 to 70 ℃. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Thermal conductivity; Pigeon pea seeds; Moisture content; Temperature; Activation energy.
Ano: 2021
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/6065

TEMPERATURE-HUMIDITY INDEX AND THERMAL COMFORT OF BROILERS IN HUMID TROPICS.
Provedor de dados: 111
Autores: Omomowo, Oluwafemi Owodunni.
In improving broiler welfare and ensuring better productivity thermal comfort of broilers is of utmost interest. To estimate the thermal comfort of broilers, the THI model was developed using commonly available meteorological parameters, namely temperature and relative humidity. This research re-examined the model by using the Levenberg-Marquardt Algorithm (Excel Solver) based nonlinear regression model to reduce the error space and generate new model constants unique to Akure, South West, Nigeria. Physiological data (cloacal temperature and body weight) were collected for a period of 6 weeks from 50 broilers raised in a developed adaptive poultry housing. Environmental data on temperature and relative humidity were used to calibrate the THI of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broilers; Thermal comfort; Temperature Humidity Index; Cloacal Temperature; Temperature.
Ano: 2021
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/6425

Optimisation of Process Parameters for Vacuum Concentration and Foaming Behaviour of Aloe vera (Aloe barbadensis Miller) Gel
Provedor de dados: 111
Autores: Mahapatra, Suryakanta; Srivastav, Prem Prakash; Halder, Kumaresh.
This study on Aloe vera gel was conducted to investigate the optimum condition for vacuum concentration in relation to its physicochemical properties and optimum foaming condition of the concentrated products which was used as raw material of foam mat drying. Twenty experiments were conducted for vacuum concentration at different temperature and time combinations. Solutions of numerical optimisation were obtained by using Design-Expert program 7.0 of stat-Ease software for the optimum concentration condition covering the criteria as temperature 55⁰C and time 60 min for concentration are- ascorbic acid 4.095%, total soluble solids  3.6 ºBx, total solids 3.7% , acidity 0.0698 % (as malic acid) and pH 4.97, while the experimental values at temperature 55⁰C...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Post harvest engineering and Food Processing optimisation; Aloe vera gel; Vacuum concentration; Temperature; Time; Foam expansion; Foam stability.
Ano: 2017
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3709

Assessing the Impact of Changing Climate on Crop Water Requirements in Nigeria.
Provedor de dados: 111
Autores: Ilesanmi, Oluwaseun Ayodele.
Climate change is a phenomenon most of the world is recently coming to terms with but unfortunately, the African region is yet to fully understand and prepare for its effects. The change is predicted to herald positive results likewise potentially severe consequences for global food security. This study aims to improve the understanding of the impact these changes being experienced in the Nigerian climate system will have on Crop Water Requirements (CWR) for optimal productivity. Five statistically downscaled and bias-corrected Global Climate Models (GCMs): CCCMA, NOAA, MIROC, ICHEC, and NCC were applied in the estimation of CWR through the period 1985–2100 under the Representative Concentration Pathway RCP8.5. These were used to produce values of crop...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crop water requirement; Climate Change; Nigeria; Rainfall; Temperature; Representative Concentration Pathways.
Ano: 2023
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/7521

Development of a hot water treatment plant suitable for banana
Provedor de dados: 111
Autores: Amin, Mohammad Nurul; Hossain, Md. Mosharraf.
Banana is a year round fruit in Bangladesh.  After harvesting, banana is attacked by postharvest disease caused by some fungi.  The quality and quantity losses of banana occur due to disease attacks and lack of proper postharvest handling.  Fungus can be destroyed or made inactive by chemical or heat treatment.  Most of the chemicals are hazardous to human health.  Heat treatment technology is simple and is a non-chemical method to kill or inactivate pest and to control fungus.  A hot water treatment plant was designed and developed with local materials for treating banana fruits.  Overall dimensions of the hot water treatment plant were 1600 mm×926 mm×1566 mm and operated by an electrical motor of 0.38 kW.  Water was heated by the six electric immersion...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hot-water treatment plant; Banana; Temperature; Exposure period; Break-even point and payback period.
Ano: 2013
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2658

Convective dehydration kinetics of noodles prepared from  taro (Colocasia esculenta), rice (Oryza sativa) and pigeonpea  (Cajanus cajan) flours
Provedor de dados: 111
Autores: Kaushal, Pragati; Sharma, Harish Kumar.
Drying characteristics of noodles prepared from 50% taro and remaining equal proportions of rice and pigeonpea flours were investigated in a convective type dryer for a temperature range of 50°C to 80°C at a constant air velocity of     1.5 m s-1.  Results indicated that drying took place in falling rate period.  The sample dried at 50°C was found better in color as compared to samples at 60°C, 70°C and 80°C.  The rehydration weight of noodles decreased with the increase in drying temperature.  Moisture transfer from noodles was described by applying Fick’s diffusion model and the effective moisture diffusivity was calculated.  Effective moisture diffusivity increased with increase in temperature.  An Arrhenius relation with activation energy of 38.53 kJ...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Noodle; Taro; Dehydration kinetics; Temperature; Moisture.
Ano: 2013
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2132

Effectiveness of a solar grain dryer for drying paddy seed in Bangladesh
Provedor de dados: 111
Autores: Roy, Dipika; Saha, Chayan Kumer; Alam, Md. Monjurul; Alam, Md. Ashraful; Sarker, Tumpa Rani.
Proper and timely drying is needed for producing quality paddy seed. Open sun drying is often produced seed with foreign materials.  Solar dryer produced by science for society (S4S), India might be suitable for country like Bangladesh. Therefore, an attempt was taken to evaluate S4S seed dryer at the Workshop, Department of Farm Power and Machinery, Bangladesh Agricultural University, Mymensingh. In this experiment, the spatial and temporal distribution of temperature and moisture in S4S solar grain dryer was investigated and the seed quality was also evaluated. The dryer performance was evaluated with six trials in Boro season from May 10 to June 6, 2017 and with three trials in Aman season from November 7 to 11, 2017. Paddy seed samples were also dried...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solar drying; Temperature; Moisture content; Drying loss; Germination.
Ano: 2020
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/5957

Comparison of five commonly used thin-layer moisture transfer models in fitting the re-wetting data of barley
Provedor de dados: 111
Autores: Basunia, Mohammad Ali.
Five commonly cited thin-layer rewetting models, including Page, Diffusion, Approximate form of diffusion, Exponential, and Polynomial were compared for their abilities to the fit the experimental re-wetting data of barley based on the root mean square error (RMSE) and mean relative error (MRE) of estimate of the measured and simulated moisture contents.  The comparison shows the Page model is the most suitable model (average, RMSE = 0.176% d.b. and MRE = 0.713% d.b.) followed by the Diffusion model (average RMSE = 0.199% d.b. and MRE = 0.862% d.b) to fit the re-wetting experimental data of barley.  The Approximate form of diffusion, the Exponential and the Polynomial models have less fitting ability then the Page and Diffusion models for the entire period...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agricultural Engineering; Post harvest technology Thin-layer; Barley; Re-wetting parameters; Temperature; Relative humidity.
Ano: 2013
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2539

Development of a photovoltaic driven ventilation system to modified traditional Ethiopian gombisa for on-cobs-maize drying
Provedor de dados: 111
Autores: Garbaba, Chemeda Abedeta.
Mycotoxin-producing fungal growth commonly reported from traditional maize storage system in southwestern Ethiopia. Un-safe moisture content at loading and non-climatically controlled nature of gombisa results in mycoflora growth and development on maize in storage system. Therefore, this paper was aimed to develop a photovoltaic driven ventilation system fitted to modified gomibsa for natural air in-bin drying of on-cobs-maize and increase the shelf life of the product. Modified gombisa was constructed from locally available materials for the current experiment. An appropriate fan type and size, humidistat set at &gt;70% and two 20 Wp photovoltaic panels were used for ventilation purpose, fan control and power the fan, respectively. In total 1.76 m3 of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Modified gombisa; Maize in cobs; Temperature; Relative humidity; Ventilation system.
Ano: 2018
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/4850

Storage performance of naturally ventilated structure  for onion bulbs
Provedor de dados: 111
Autores: Ambe, Wolelaw Endalew; Getahun, Abaye; Demissew, Ayalew; Ambaye, Tesfa.
A comparative study of naturally ventilated onion bulb storage structure and traditional in house floor storage was conducted in Fogera plain, Ethiopia to determine their performances.  Onion bulb of Bombay Red cultivar was stored for 90 days in naturally ventilated storage structure and in house floor.  The study was conducted from end of April to Jun 2011.  Hourly temperature and relative humidity of ambient and storage environment were monitored and the physiological weight loss, sprouting percentage, rotting percentage and percentage of marketable bulbs on stored bulb were recorded every ten days interval.  The observation has shown that the temperature profile of naturally ventilated storage structure has followed similar pattern with the ambient...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Physiological loss; Relative humidity; Sprouting loss; Temperature; Weight loss.
Ano: 2014
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3008

High temperatures and absence of light affect the hatching of resting eggs of Daphnia in the tropics
Provedor de dados: 42
Autores: Paes,Thécia A.S.V.; Rietzler,Arnola C.; Pujoni,Diego G.F.; Maia-Barbosa,Paulina M.
Temperature and light are acknowledged as important factors for hatching of resting eggs. The knowledge of how they affect hatching rates of this type of egg is important for the comprehension of the consequences of warming waters in recolonization of aquatic ecosystems dependent on dormant populations. This study aimed at comparing the influence of different temperature and light conditions on hatching rates of Daphnia ambigua andDaphnia laevis resting eggs from tropical environments. The ephippia were collected in the sediment of three aquatic ecosystems, in southeastern Brazil. For each lake, the resting eggs were exposed to temperatures of 20, 24, 28 and 32 °C, under light (12 h photoperiod) and dark conditions. The results showed that the absence of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cladocera; Diapause; Ephippium; Light; Temperature; Tropical aquatic ecosystems.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000100179

Influence of temperature and conductivity on the life-history characteristics of a pampean strain of Brachionus plicatilis
Provedor de dados: 42
Autores: FERRANDO,NOELIA S.; CLAPS,MARÍA C.; BENÍTEZ,HERNÁN H.; GABELLONE,NÉSTOR A.
ABSTRACT In the present work, we provide the first approach about the life-history of Brachionus plicatilis in South America. We tested with laboratory experiments the response of the pampean strain of B. plicatilis for two of its main stressors (conductivity and temperature). We evaluated the effects of eight conductivity values from 1 to 17 mS.cm-1 and two temperatures (15 and 25 °C) to compare its abundance with those obtained in the pampean lotic and lentic environments, where this rotifer is frequent or dominant. The results demonstrated that the increase in population-growth rate and the peak of abundance occurred at the highest temperature and at medium conductivity. Minimum values were obtained at the lowest temperature and conductivities analyzed,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Euryhaline rotifer; Experimental cultures; Growth rate; Salinity; Temperature.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401431

Bacterial and Archaeal Communities Variability Associated with Upwelling and Anthropogenic Pressures in the Protection Area of Arraial do Cabo (Cabo Frio region - RJ)
Provedor de dados: 42
Autores: COELHO-SOUZA,SERGIO A.; ARAÚJO,FÁBIO V.; CURY,JULIANO C.; JESUS,HUGO E.; PEREIRA,GILBERTO C.; GUIMARÃES,JEAN R.D.; PEIXOTO,RAQUEL S.; DÁVILA,ALBERTO M.R.; ROSADO,ALEXANDRE S.
ABSTRACTUpwelling systems contain a high diversity of pelagic microorganisms and their composition and activity are defined by factors like temperature and nutrient concentration. Denaturing gradient gel electrophoresis (DGGE) technique was used to verify the spatial and temporal genetic variability of Bacteria and Archaea in two stations of the Arraial do Cabo coastal region, one under upwelling pressure and another under anthropogenic pressure. In addition, biotic and abiotic variables were measured in surface and deep waters from three other stations between these stations. Six samplings were done during a year and adequately represented the degrees of upwelling and anthropogenic pressures to the system. Principal Component Analysis (PCA) showed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microbial diversity; Leucine incorporation; Flow cytometry; Temperature; Nutrients availability; Brazilian Upwelling System.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000401737

The effect of temperature on the germination of Melocactus violaceus Pfeiff. (Cactaceae), a threatened species in restinga sandy coastal plain of Brazil
Provedor de dados: 42
Autores: ZAMITH,LUIZ R.; CRUZ,DENISE D.; RICHERS,BARBARA T.T.
Melocactus violaceus is an endangered species due to habitat destruction and the overcollection of this species for ornamental use. The aim of this study was to test the effect of different temperatures on the germination of M. violaceus. Three treatments were conducted: a constant temperature of 25ºC, a 20-35ºC alternating temperature, both inside germination chamber, and an alternating temperature under room temperature (mean temperature ranged from 25-37ºC). The final seed germination rates at the alternating temperature treatments were not significantly different (65% in the seed germinator and 62.5% at room condition). However, both treatments with alternating temperatures had significantly higher germination rates compared to the treatment kept at...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cactaceae; Conservation; Germination; Melocactus violaceus; Restinga; Temperature.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200615

Effect of temperature on the development and thermal requirements of Wolbachia-infected and antibiotically cured Trichogramma kaykai Pinto and Stouthamer (Hymenoptera: Trichogrammatidae)
Provedor de dados: 44
Autores: Hohmann,Celso L.; Luck,Robert F.
The development times and the thermal requirements of Wolbachia-infected and antibiotically cured Trichogramma kaykai Pinto and Stouthamer (Hymenoptera: Trichogrammatidae), using Trichoplusia ni Hübner (Lepidoptera: Noctuidae) eggs, were assessed at four constant temperatures (15, 20, 25, and 30°C), 70 ± 5% RH, photophase 14 h. The knowledge of temperature effects are very important in helping understand the dynamics of desert organisms like T. kaykai that face extreme temperatures during the season. Cured wasps developed faster at higher temperatures (20, 25, and 30°C) than infected wasps. However, infected wasps developed faster at the lowest temperature (15°C) than cured wasps. Developmental times of cured and infected wasps increased from 7.0 and 7.1...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insecta; Parasitoids; Temperature; Parthenogenetic induced bacteria.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0301-80592000000300012

Isolated or associated experimental contamination of albumen and egg yolk for Salmonella Enteritidis and Escherichia coli: influence of temperature and storage time
Provedor de dados: 45
Autores: Pinto,A.T.; Mendonça,A.D.; Silva,E.N.
The behavior of Salmonella enteritidis (SE) and Escherichia coli in albumen and yolk of chicken eggs submitted to two different temperatures, 8ºC and 30ºC, when separately inoculated or in the form of mixed cultures was studied. There was no difference in the behaviour of the tested agents even when inoculated together. Even under high temperature, E. coli did not multiply in the albumen, demonstrating the inhibition power for that microorganism, while SE increased its population up to three logarithmic cycles. In egg yolk, SE demonstrated psychrotrophic characteristics.
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Hicken; Egg quality; Bacterial growth; Temperature; Storage.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352009000100018

Vegetable oil sources in diets for freshwater angelfish (Pterophyllum scalare, Cichlidae): growth and thermal tolerance
Provedor de dados: 45
Autores: Ikeda,A.K.; Zuanon,J.A.S.; Salaro,A.L.; Freitas,M.B.D.; Pontes,M.D.; Souza,L.S.; Santos,M.V.
The influence of fatty acid composition of the diets on the productive performance and on cold and heat tolerance of juvenile freshwater angelfish (Pterophyllum scalare), in three different phases, was studied. Phase I studied the productive performance of freshwater angelfish in a completely randomized experimental design with four treatments, canola, linseed, olive and soybean oils and four replicates during 50 days using 192 fish in 16 aquaria. Phase II studied the cold tolerance of juvenile freshwater angelfish using 72 juvenile freshwater angelfish, coming from phase I and maintained in 12 aquaria climatized chamber. The temperature was reduced 1ºC per day, until the observation of 100% fish mortality. Phase III, it was studied the heat tolerance of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ornamental fish; Fatty acids; Growth; Survival; Temperature.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352011000300019

Larval density, temperature and biological aspects of Chrysomya megacephala (Diptera: Calliphoridae)
Provedor de dados: 45
Autores: Reigada,C.; Godoy,W.A.C.
The effect of larval density on the survival, fecundity and body size at two temperatures in experimental populations of C. megacephala was studied. No effect from simultaneous influence of density and temperature on life history characteristics of C. megacephala was found. Significant effects of density and temperature on survival, fecundity and body size were observed. The importance of these results for the population dynamics of C. megacephala is discussed.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chrysomya megacephala; Density-dependence; Temperature; Survival; Fecundity.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352006000400018

Effects of abiotic stress on biomass and anthocyanin production in cell cultures of Melastoma malabathricum
Provedor de dados: 48
Autores: CHAN,L. K; KOAY,S. S; BOEY,P. L; BHATT,A.
Plant cell cultures could be used as an important tool for biochemical production, ranging from natural coloring (pigments) to pharmaceutical products. Anthocyanins are becoming a very important alternative to synthetic dyes because of increased public concern over the safety of artificial food coloring agents. Several factors are responsible for the production of anthocynin in cell cultures. In the present study, we investigate the effects of different environmental factors, such as light intensity, irradiance (continuous irradiance or continuous darkness), temperature and medium pH on cell biomass yield and anthocyanin production in cultures of Melastoma malabathricum. Moderate light intensity (301 - 600 lux) induced higher accumulation of anthocyanins...
Tipo: Journal article
Palavras-chave: Irradiance; Medium pH; Photoperiod; Temperature; Melastoma malabathricum.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602010000100014

Effect of temperature on the life cycle of Acanthagrion Selys, 1876 (Insecta: Coenagrionidae) under artificial conditions
Provedor de dados: 49
Autores: Fulan,João Ânderson; Anjos,Marcelo Rodrigues dos; Machado,Nadja Gomes.
The goal of this study was to investigate the effect of temperature on the life cycle of Acanthagrion nymphs sampled in a stream in the southern state of Amazonas. Altogether, 50 nymphs (10 in each of the five treatments) with ambient temperatures of 16, 20, 24, 28 and 32°C and water temperatures of 18, 22, 26, 30 and 34oC, respectively, were used. The only treatment that had a hatching adult was at a temperature of 28oC, identified in a single species, Acanthagrion apicale. In all other treatments (16, 20, 24 and 32oC), all nymphs died, respectively 1, 1, 3 and 2 days. We conclude from the results of this study that controlling water temperature near 28°C was the most efficient for obtaining adult A. apicale, and that this temperature was close to the...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Insecta; Nymphs; Temperature.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032015000200401

Epipelagic euphausiids assemblage in the Gerlache Strait (Antarctic Peninsula) during January 2015
Provedor de dados: 50
Autores: Rivera-Gómez,Marisol; Giraldo,Alan; Mojica-Moncada,Diego F.
ABSTRACT The spatial distribution of the epipelagic Euphausiids was investigated during the first Colombian Scientific Expedition to Antarctica -Expedición Caldas- in the Gerlache Strait during the austral summer of 2015. Surface zooplankton was collected at 20 oceanographic stations with a simple conical net of 0.6 m in diameter mouth and 200 µm of mesh net. Four euphausiid species were collected in 70 % of the sampling stations: Euphausia crystallorophias Holt and Tattersall 1906, Euphausia superba Dana 1850, Thysanoessa sp. and Thysanoessa macrura Sars 1883. Euphausia crystallorophias was the most abundant species with maximum density of 818 ind 1000 m-3 associated with the entrance of the Wilhelmina Bay, in the central area of the Gerlache Strait. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Euphausiacea; Temperature; Salinity; Antarctic Ocean; Austral summer.
Ano: 2021
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612021000300129

Efecto de la temperatura en la regeneración de especies leñosas del Chaco Serrano e implicancias en la distribución actual y potencial de bosques
Provedor de dados: 51
Autores: Pais Bosch,Ana I; Tecco,Paula A; Funes,Guillermo; Cabido,Marcelo.
La temperatura influye sobre los límites de distribución de las especies leñosas, actuando sobre los procesos asociados con la fase regenerativa de las plantas. Nos propusimos analizar su influencia en la distribución altitudinal del bosque chaqueño serrano y su potencial coexistencia con bosquecillos de altura en las Sierras Grandes de Córdoba. Se evaluó la regeneración a campo de dos especies del bosque serrano (Ruprechtia apetala y Lithraea molleoides) y la dominante en los bosquecillos de altura (Polylepis australis) abarcando el gradiente altitudinal completo de estas sierras (900-2700 m s.n.m.). En el laboratorio se evaluó la germinación bajo cuatro termo-períodos representativos de las condiciones del gradiente altitudinal. Polylepis australis...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Regeneración; Temperatura; Gradiente altitudinal; Chaco Serrano; Límite superior de bosques; Regeneration; Temperature; Altudinal gradient; Montane Chaco Woodland; Upper limits of forests.
Ano: 2012
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-23722012000200010

Seed germination performances of Styrax species help understand their distribution in Cerrado areas in Brazil
Provedor de dados: 53
Autores: Kissmann,Camila; Habermann,Gustavo.
In this descriptive paper, we described germination responses of Styrax pohlii, S. camporum and S. ferrugineus seeds at 5, 10, 15, 20, 25, 30, 35, 40 and 45 °C. We also assessed the percentage germination (%G) of S. pohlii seeds with different seed water contents because, as a forest species, it seems to have recalcitrant seed behavior. Intrigued by the capacity of seeds of this species to germinate directly from puddles formed on poorly drained soils of riparian forests, where it typically occurs, we also tested the effect of de-pulping fruits on germination of S. pohlii seeds under hypoxia and normoxia conditions. In addition, we checked whether distinct concentrations of gibberellic acid (GA3) could break S. ferrugineus seed dormancy, a typical seed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hypoxia; Styrax pohlii; S. camporum; S. ferrugineus; Temperature; Desiccation seed tolerance.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052013000300001

Base temperature for leaf appearance and phyllochron of selected strawberry cultivars in a subtropical environment
Provedor de dados: 53
Autores: Rosa,Hamilton Telles; Walter,Lidiane Cristine; Streck,Nereu Augusto; Andriolo,Jerônimo Luiz; Silva,Michel Rocha da; Langner,Josana Andréia.
Leaf development is characterized by the appearance of new leaves and is related to crop leaf area index, which affects the interception of solar radiation used for photosynthesis and biomass production and ultimately defines crop yield. The objectives of this paper were to estimate the base temperature for leaf appearance and to determine the phyllochron of two strawberry cultivars considering several planting dates. A two-year field experiment was conducted during 2008 and 2009 in Santa Maria (RS). The cultivars Arazá (early) and Yvapitá (late) were used at three planting dates in both years. Base temperature (Tb) was estimated using the Mean Square Error (MSE) approach of the regression between accumulated leaf number (LN) and accumulated thermal time...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fragaria x ananassa; Leaf development; Plant development; Temperature; Thermal time.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052011000400029

Temperature-dependent alterations of respiration in leaves of two selected vascular plant species: the role of the alternative oxidase pathway
Provedor de dados: 53
Autores: Pystina,Natalia V.; Danilov,Roman A.
Effects of higher temperatures on respiration and activity of alternative oxidase (AOX) were studied in mature leaves of Ajuga reptans L. and Rhodiola rosea L. Total respiration in both A. reptans and R. rosea increased exponentially with the increasing temperature of 10 °C to 35 °C. Respiration in the presence of benzhydroxamic acid (BHAM) also increased exponentially in accordance with the increasing temperature in the leaves of both A. reptans and R. rosea. Relative activity of the alternative pathway decreased significantly in the leaves of A. reptans with increasing temperatures. However, an increase in the relative activity of the alternative pathway was detected in the leaves of R. rosea. Thermoresistance of the alternative respiratory pathway was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alternative respiratory pathway; Respiration; Alternative oxidase; Leaves; Temperature.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052002000200004

Phytochrome and temperature control of seed germination in Muntingia calabura L. (Elaeocarpaceae)
Provedor de dados: 52
Autores: Leite,Idalina T. de A.; Takaki,Massanori.
The temperature range of germination of seeds of Muntingia calabura L. was 15-35° C and the optimum temperature at 35° C where more seeds germinated at short period. The fluence response curves demonstrated the involvement of phytochrome in the control of germination through the low fluence response. The effect of photoperiod showed that the species need long daily exposures to white light and that shade light inhibited completely seed germination, confirming as pioneer species that colonized only large gaps in the forest.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seed germination; Phytochrome; Light; Temperature; Muntingia calabura.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132001000300012

Thermoregulation in colonies of africanized and hybrids with Caucasian, Italian and Carniolan Apis mellifera honey bees
Provedor de dados: 52
Autores: Toledo,Vagner de Alencar Arnaut de; Nogueira-Couto,Regina Helena.
This experiment was carried out to study the internal temperature regulation of a colony of Africanized honey bees (AFR), compared with hybrid Caucasian (CAU), Italian (ITA), and Carniolan (CAR) bees, during the period of one year and different size hives located in a sub-tropical region. The instant internal temperature, 33.7 ± 1.5° C for the AFR, 33.5 ± 1.4° C for the CAU, 33.7 ± 1.5° C for the ITA and 33.8 ± 1.4° C for the CAR, did not show any significant difference (P&amp;gt;0.05). The maximum temperature (36.1 ± 2.3° C) was statistically different (P&lt;0.05) from the minimum (27.6 ± 5.3° C). There was no difference (P&amp;gt;0.05) in the mean internal temperature, between the nucleus (31.7 ± 6.3° C) and the brood nest (32.1 ± 5.3° C) measured...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Temperature; Honey bee; Apis; Thermoregulation; Hive; Hybrids.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131999000400007

Parasitism Capacity of Trichogramma pretiosum and Trichogramma acacioi (Hym.: Trichogrammatidae) on eggs of Sitotroga cerealella (Lep.: Gelechiidae)
Provedor de dados: 52
Autores: Pratissoli,Dirceu; Zanuncio,José Cola; Vianna,Ulysses Rodrigues; Andrade,Josimar Souza; Zinger,Fernando Domingo; Alencar,João Rafael de Conte Carvalho de; Leite,Germano Leão Demolin.
The objective of this work was to evaluate the parasitism capacity of Trichogramma pretiosum Riley and T. acacioi Brun, Moraes and Soares (Hymenoptera: Trichogrammatidae) in eggs of the alternative host Sitotroga cerealella (Olivier) (Lepidoptera: Gelechiidae) aiming to use both species in biological control programs of Nipteria panacea Tierry-Mieg (Lepidoptera: Geometridae). The parasitism rhythm and total parasitism of these parasitoid species were affected by the temperature with higher values during the first 24 h of their life. Parasitism period was longer for T. pretiosum and T. acacioi at the lowest temperature.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Avocado; Insecta; Trichogrammatidae; Temperature.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000600021

Gonadosomatic index and some hematological parameters in African catfish  Clarias gariepinus (Burchell, 1822) as affected by feed type and temperature level
Provedor de dados: 52
Autores: Al-Deghayem,Waleed A.; Al-Balawi,Hamoud F.; Kandeal,Saleh A.; Suliman,El Amin M.
ABSTRACT The purpose of the current study was to examine the effects of different feeds/nutrients and temperature on the gonadal development of Clarias gariepinus. The gonadosomatic index (GSI) and blood parameters including red blood cell count (RBCs), white blood cell count (WBCs), hemoglobin (Hgb) level, hematocrit (HCT), platelets (PLT) and mean corpuscular volume (MCV) were investigated. Four types of fish feed of 36% protein content [D1(fish meal), D2 (soybean meal), D3 (peameal) and D4 (commercial tilapia feed)] and 3 different levels of temperature (T1(24℃), T2(28℃) and T3(32℃) were tried in this study for a duration of 4 months. The mean values were as follows: female GSI (14.68 ± 4.86), male GSI (0.70 ± 0.32), RBCs x 106(2.45± 0.64), WBCs x...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Feed; Temperature; Clarias gariepinus; Hematology; GSI.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132017000100404

Effect of vacuum impregnation temperature on the mechanical properties and osmotic dehydration parameters of apples
Provedor de dados: 52
Autores: Paes,Sabrina Silva; Stringari,Gustavo Beulke; Laurindo,João Borges.
The effect of sucrose solution temperature on the mechanical properties, water loss (WL), solids gain (SG) and weight reduction (WR) of apples (Fuji var.) treated by vacuum impregnation was studied. Temperatures were varied from 10 to 50 ºC, using a sucrose solution of 50 ºBrix. The mechanical properties were studied throughout a stress relaxation test. The results showed that the SG varied between 10.57 and 14.29 % and the WL varied between 10.55 and 14.48 %. The treated fruit soluble solids increased with the temperature probably due to the lower viscosity of the solution. The maximum stress was highest at 10 ºC, decreasing at higher temperatures, probably due the softening of the structure.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vacuum; Impregnation; Temperature; Solids; Water; Texture.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000400018

Thermic Variation in Incubation and Development of Pantanal Caiman (Caiman crocodilus yacare) (Daudin, 1802) Kept in Metabolic Box
Provedor de dados: 52
Autores: Miranda,Maristela Parra; Moraes,Gentil Vanini de; Martins,Elias Nunes; Maia,Luis Carlos Pinto; Barbosa,Orlando Rus.
Thirty-two eggs of Pantanal caiman (Caiman crocodilus yacare) (Daudin, 1802) were incubated at 30° C. After 20 days of incubation at 30° C, the remaining eggs were distributed in the following way: seven at 34° C, seven at 32° C, six at 30° C and six at 28° C. At 32° C and 34° C a 100% hatchability was obtained while at 30° C 83.3% and at 28° C 66.6%. After hatching, the animals were kept for 120 days at the same temperature of their final incubation. Weight (g) control and morphometric (cm) analysis were carried out. The statistic design was totally randomized and the data were treated by regression analysis showing a quadratic behavior ( p&lt;0.05). It was found that weight, total length (TTL), tail length (TL), snout- vent length (SVL), head length...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Caiman; Development; Incubation; Temperature; Thermic variation.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132002000300012

Influences of Different Coating Materials on the Quality Changes of Hardboiled Salted Duck Eggs under Ambient Storage
Provedor de dados: 52
Autores: Venkatachalam,Karthikeyan; Lekjing,Somwang; Noonim,Paramee.
Abstract The present study investigated the influences of selected coatings (paraffin wax (PW), chitosan (CH), whey protein isolate (WPI), and soy protein isolate (SPI)) on the quality changes of hardboiled salted duck eggs when kept under ambient temperature (30±2 oC). At 5-day intervals for 15 days, samples were tested for color (L*, C*, and h˚), shell strength, weight loss, microbial analysis, water activity, moisture, pH, salt content, TBARS, and sensory analysis. L*, C* and h˚ gradually decreased in egg white, whereas C* and h˚ gradually increased in egg yolk. Shell strength gradually decreased in all cases, and weight loss similarly increased throughout the storage. PW and WPI coatings gave the best shell strengths and the least weight loss. The aw...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Duck egg; Salting; Coating; Storage; Temperature; Quality.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132019000100512

Temperature effects on Trichogramma pretiosum Riley and Trichogrammatoidea annulata De Santis
Provedor de dados: 52
Autores: Maceda,Arlei; Hohmann,Celso L; Santos,Honório R. dos.
The influence of temperature on lifetime attributes of Trichogramma pretiosum Riley and Trichogrammatoidea annulata De Santis (Hymenoptera: Trichogrammatidae) was evaluated at four constant temperatures (15, 20, 25, and 30º C), RH 70 ± 10%, photophase 14 h. Anagasta kuehniella (Lepidoptera: Pyralidae) eggs were used as hosts. Developmental times of both parasitoid species were similar when exposed to 20, 25, or 30º C. T. annulata, however, developed slightly faster than T. pretiosum at 15º C. Emergence rates of both species were above 89%. The temperature threshold for T. pretiosum and T. annulata was 11º C and the number of degree-days required for their development was 126.9 and 122.3, respectively. Parasitization was maximal at 25º C. T. annulata,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insecta; Biological control; Avocado fruit borer; Temperature.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132003000100005

Effects of temperature and salinity on the survival rates of coxicerberus ramosae (Albuquerque, 1978), an interstitial isopod of a Sandy Beach on the coast of Brazil
Provedor de dados: 52
Autores: Albuquerque,Elaine Figueiredo; Meurer,Bruno; Netto,Godofredo da Camara Genofre.
The tolerance to the combined effects of temperature and salinity was investigated in the interstitial isopod Coxicerberus ramosae (Albuquerque, 1978), a species of intertidal zone of sandy beaches in Rio de Janeiro, Brazil. The animals were collected on Praia Vermelha Beach. The experiments lasted 24 h and nine salinities and seven temperatures were used for a total of 63 combinations. Thirty animals were tested in each combination. The species showed high survival in most of the combinations. The temperature of 35 ºC was lethal and at 5 ºC, the animals tolerated only a narrow range of salinities. The statistical analyses showed that the effects of temperature and salinity were significant on the survival, which confirmed the euryhalinity and eurythermy...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Interstitial; Isopod; Resistance; Temperature; Salinity; Coxicerberus.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000500015

Spore Germination and Protonemal Development of Dolichomitriopsis diversiformis
Provedor de dados: 52
Autores: Liu,Shibiao; Wei,Hua; Peng,Xiaolie; Li,Jing.
ABSTRACT Dolichomitriopsis diversiformis is an endemic and threatened moss in eastern Asia. In vitro culture and light microscopic observation were employed to study its developmental process from spore germination to the formation of young gametophyte, as well as effects of light and temperature on its spore germination and protonemal development. Microscopic observations revealed that its spores were positively photoblastic with exosporous germination, and sporelings were classified as the bryum-type. Light and dark conditions were compared to understand their effects on spore germination. In 24 h continuous illumination, all spores germinated in both 20 ℃ and 25 ℃. In contrast, in darkness at 20 ℃ from one to 30 days, spores did not germinate. However,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dolichomitriopsis diversiformis; Spore; Protonema; Light; Temperature.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132016000100202

The effect of temperature and salinity on the physiological rates of the mussel Perna perna (Linnaeus 1758)
Provedor de dados: 52
Autores: Resgalla Jr.,Charrid; Brasil,Elisângela de Souza; Salomão,Luis Carlos.
The aim of this work was to study the rates of respiration, clearance, excretion and absorption efficiency at different temperature and salinity under laboratory conditions for Perna perna. Results showed variations in physiological rates and in acclimatization capacity which, taken together, enabled to understand its behavior in the environment, as well as to estimate its scope for growth. All experiments were carried out in static conditions, in ten replicas with one mussel by flasks. Perna perna was capable of achieving acclimatization for both clearance and absorption efficiency (15 to 30 ºC), but it achieved only partial acclimatization for respiration and excretion under chronic temperature conditions. The clearance and respiration rates increased...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mussel; Perna perna; Physiological rates; Temperature; Salinity; Net growth efficiency.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000300019

Intensity of bitterness of processed yerba mate leaves originated in two contrasted light environments
Provedor de dados: 52
Autores: Rakocevic,Miroslava; Medrado,Moacir José Sales; Lucambio,Fernando; Valduga,Alice Teresa.
The bitterness intensity of beverage prepared from the leaves produced on the males and females of yerba mate (Ilex paraguariensis), grown in the forest understory and monoculture, was evaluated. The leaves were grouped by their position (in the crown and on the branch tips) and by the leaf age. The leaf gas exchange, leaf temperature and photosynthetic photon flux density were observed. Inter and intra-specific competition for light and self-shading showed the same effect on yerba mate beverage taste. All the shading types resulted in bitterer taste of the processed yerba mate leaves compared to the leaves originated under the direct sun exposure. The leaves from the plants grown in the monoculture showed less bitterness than those grown in the forest...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leaf age; Photosynthesis; Shade; Stomatal conductance; Temperature; Transpiration.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000300018

Antimicrobial activity of lactic acid bacteria and the spectrum of their biopeptides against spoiling germs in foods
Provedor de dados: 52
Autores: Djadouni,Fatima; Kihal,Mebrouk.
The objective of this study was to isolate LAB from dairy, meat products and agro-industrial wastes and to investigate their antagonist activity. A total of 141 isolates were screened for the inhibitory effect on ten indicator strains in the agar spot test. Results showed that strain LBbb0141 contained antimicrobial compound with wide spectrum that inhibited the growth of ten indicator Gram-positive and Gram-negative strains. The bacteriocin activity attained its maximum value using the MRS agar at initial pH 7.5 and 30°C incubation temperature.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lactobacilli; Enterocoquess; Leuconostoc sp; Bacteriocins activities; Indicators microorganisms; Listeria innovii; Growth media; PH; Temperature.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132012000300015

Thermal requirements of Trichogramma pretiosum and T. acacioi (Hym.: Trichogrammatidae), parasitoids of the avocado defoliator Nipteria panacea (Lep.: Geometridae), in eggs of two alternative hosts
Provedor de dados: 52
Autores: Pratissoli,Dirceu; Zanuncio,José Cola; Vianna,Ulysses Rodrigues; Andrade,Josimar Souza; Pinon,Tobias Baruc Moreira; Andrade,Gilberto Santos.
This research studied the thermal requirements of Trichogramma pretiosum and T. acacioi (Hymenoptera: Trichogrammatidae), parasitoids of Nipteria panacea (Lepidoptera: Geometridae), with eggs of the alternative hosts Anagasta kuehniella (Lepidoptera: Pyralidae) and Sitotroga cerealella (Lepidoptera: Gelechiidae) aiming to use these natural enemies in biological control programs of this pest in avocado orchards. T. pretiosum needed 151.83 and 160.04 degree-days, above threshold of 10.70 and 10.75°C, while these values were 158.50 and 155.46 degree-days, above threshold of 10.67 and 10.46°C for T. acacioi when exposed to eggs of A. kuehniella and S. cerealella, respectively.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Avocado; Alternative host; Biological control; Temperature.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000500003

Hydrothermal treatments in the development of isoflavone aglycones in soybean (Glycine max (L.) Merrill) grains
Provedor de dados: 52
Autores: Carrão-Panizzi,Mercedes C.; Goés-Favoni,Silvana Pedroso de; Kikuchi,Akio.
Studies were carried out to enhance the development of isoflavone aglycones in soybean. Grains of two soybean cultivars, BR 36 and IAS 5, 115 and 278 mg/100g of total isoflavone, respectively, were treated hydrothermalyl at 45, 60 and 85° C for 5, 30 and 60 minutes. Pre-treatments of grains at 60° C for 60 minutes allowed a considerable increase of the isoflavone aglycones. Non-treated grains of BR 36 and IAS 5 showed 1.2 mg/100g of genistein, after hydrothermal treatments,which increased to 12 and 53 mg/100g, in each variety, respectively. At higher temperature (85 ° C) there was a decrease of the aglycones due to inactivation of beta-glycosidases. Malonyl compounds were also reduced at higher temperatures. In processing functional soybean foods,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soybean; Isoflavones; Glycosides; Aglycones; Temperature.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132004000200010

Microclimate of Atlantic forest fragments: regional and local scale heterogeneity
Provedor de dados: 52
Autores: Ramos,Flavio Nunes; Santos,Flavio Antonio Maës.
The aim of this work was to investigate whether (i) the organisms within different fragments, on regional scale (separated by up to 100 km), could be submitted to similar climatic conditions (rainfall and temperature), and whether (ii) the edge formation in forest fragments could stimulate microclimatic changes (canopy cover, air temperature and soil humidity), on local scale. The organisms within different fragments, on regional scale, were submitted to different climatic conditions, and the edge formation in the forest fragment stimulated microclimatic changes, on local scale, although in a heterogenic way. Not just the distance from the edge influenced the microclimatic differences. Probably, the edge age, location, the matrix structure, as well as, gap...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic forest; Canopy openness; Edges; Fragmentation; Soil moisture; Temperature.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000700011

Influence of temperature and diet on the development of Ulomoides dermestoides (Fairmaire, 1893) (Coleoptera, Tenebrionidae, Diaperinae)
Provedor de dados: 52
Autores: Marinoni,Renato C.; Ribeiro-Costa,Cibele S.
Ulomoides dermestoides (Fairmaire, 1893) develops in stored food products (peanuts, maize, oats, rice, sorghum, etc.) and breeds successfully in the laboratory. To determine the best conditions for development, experiments were set up in different temperatures and diets, similar to storage conditions of peanuts (Arachis hypogaea L.). The higher viability of individuals and the shorter developmental time were observed in the diet composed of hulls and seeds of fruits at 21 and 24°C.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coleoptera; Ulomoides dermestoides; Peanuts; Diet; Temperature; Moisture.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132001000200004

Population dynamics of Musca domestica (Diptera: Muscidae): experimental and theoretical studies at different temperatures
Provedor de dados: 52
Autores: Tardelli,Carina Aparecida; Godoy,Wesley Augusto Conde; Mancera,Paulo Fernando Arruda.
In the present study, the population dynamics of M. domestica was evaluated at two different temperatures, 20 and 30ºC. The dynamics was modeled using a density-dependent model of population growth. The temperatures investigated in this study produced no qualitative change in terms of dynamic behaviour, i. e. the population dynamics of M. domestica was characterized by a stable equilibrium at both temperatures. However, the steady state was influenced by the results obtained at different temperatures. The difference between the eigenvalues obtained at the two temperatures was probably the cause of the difference between the distinct steady states. The implications of these results for the population dynamics of M. domestica are discussed.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Population dynamics; Musca domestica; Density-dependent model; Temperature.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132004000500013

Seed germination in Miconia theaezans (Bonpl.) Cogniaux (Melastomataceae)
Provedor de dados: 52
Autores: Godoi,Simone; Takaki,Massanori.
The effects of light and temperature were studied on the seeds of Miconia theazeans by isothermic and alternating temperature incubations. The optimum temperature for seed germination was determined by final percentage and germination rates as located in the range of 27.5 to 30 °C and by germination kinetics at the range of 19.5 to 30 °C. The germination was dependent on diffusion processes. The minimum and maximum temperatures were 12.5-15°C and 32.5-35°C, respectively. The seeds showed strong light dependence for germination with the necessity of daily 4-6 h white light irradiation for the maximum induction of germination. However, under 30-20 °C alternating temperatures, daily 2 hours white light was enough to induce germination and attained maximum...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Light; Seed germination; Temperature.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000400002

Temperature Dependent Seed Germination of Dalbergia nigra Allem (Leguminosae)
Provedor de dados: 52
Autores: Ferraz-Grande,Fernanda G. A.; Takaki,Massanori.
The germination of endangered species Dalbergia nigra was studied and 30.5° C was found as optimum temperature, although the species presented a broad temperature range where germination occurs and light had no effect. The analysis of kinetics of seed germination confirmed the asynchronized germination below and above the optimum temperature. The light insensitive seed and germination also at high temperatures indicated that D. nigra could occur both in understories and gaps where the mean temperature was high.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dalbergia nigra; Endangered species; Seed germination; Temperature.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132001000400010

Longevity of Epidendrum ibaguense inflorescences influenced by the storage temperature and ethylene inhibitor
Provedor de dados: 52
Autores: Santos,Joice Simone dos; Finger,Fernando Luiz; Mapeli,Ana Maria; Karsten,Juliane; Mendes,Teresa Drummond Correia; Barbosa,José Geraldo.
This work had the goal to evaluate the influence of temperature and dry storage on the postharvest longevity of Epidendrum ibaguense flowers previously treated with silver thiosulfate (STS). The flowers were harvested and pulsed for 30 minutes with 2 mM STS. Then both, the STS treated and untreated flowers were packed in perforated low density polyethylene bags, packed in cardboard boxes and stored at 5 and 10°C, where they remained for four and eight days. After this period, the flowers were kept in vase with distilled water at 25ºC, and analyzed at every 24 h. The experiment was arranged in a complete random design 2 x 2 x 2 factorial scheme, with four replicates, containing four inflorescences each, except for the determination of transpiration and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Orchid; Cut flower; Temperature; Abscission.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132012000200004

Influence of low environmental temperature on inflammation in bullfrog (Rana catesbeiana): qualitative and quantitative evaluation
Provedor de dados: 62
Autores: CATÃO-DIAS,José Luiz; SINHORINI,Idércio Luiz.
Objectives of this study were to investigate the influence of low environmental temperature on the experimentally induced inflammatory response in post-metamorphic Rana catesbeiana (bullfrogs). To accomplish these goals, 120 specimens of Rana catesbeiana were kept at 6ºC and 24ºC, and treated by transfixion of thigh muscular tissue with a 5-0 suture or IM carrageenan injection. Results obtained through qualitative and quantitative evaluations showed that the lower environmental temperature significantly modulates the inflammatory process development. The animals in both models that were kept at 6ºC showed a significantly lower number of inflammatory cells in the lesion site than the one verified at 24ºC, apart from the evolution time. On the other hand,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Inflammation; Temperature; Amphibia; Rana catesbeiana; Bullfrog.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-95961999000200004

Effect of temperature on oviposition in four species of the melanogaster group of Drosophila
Provedor de dados: 57
Autores: SRIVASTAVA,TULIKA; SINGH,B. N.
Experiments were conducted to test the effect of temperature on oviposition in four species of the melanogaster group of Drosophila: D. ananassae, D. bipectinata, D. malerkotliana and D. biarmipes. In each species, two wild strains were used and eggs laid by females at three different temperatures (19°C, 24°C and 30°C) were counted for four days at 24 h interval. It is evident from the results that females of D. ananassae, D. bipectinata, D. malerkotliana and D. biarmipes lay low number of eggs at low temperature (19°C). Thus oviposition in these four species of Drosophila is significantly reduced at low temperature.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Four Drosophila species; Melanogaster group; Temperature; Oviposition.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081998000300014

Temperature, air pollution, and mortality from myocardial infarction in São Paulo, Brazil
Provedor de dados: 56
Autores: Sharovsky,R.; César,L.A.M.; Ramires,J.A.F.
An increase in daily mortality from myocardial infarction has been observed in association with meteorological factors and air pollution in several cities in the world, mainly in the northern hemisphere. The objective of the present study was to analyze the independent effects of environmental variables on daily counts of death from myocardial infarction in a subtropical region in South America. We used the robust Poisson regression to investigate associations between weather (temperature, humidity and barometric pressure), air pollution (sulfur dioxide, carbon monoxide, and inhalable particulate), and the daily death counts attributed to myocardial infarction in the city of São Paulo in Brazil, where 12,007 fatal events were observed from 1996 to 1998....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Epidemiology; Myocardial infarction; Mortality; Temperature; Atmospheric pressure; Air pollution.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2004001100009

Cardiovascular, respiratory and metabolic responses to temperature and hypoxia of the winter frog Rana catesbeiana
Provedor de dados: 56
The objective of the present study was to determine the effects of hypoxia and temperature on the cardiovascular and respiratory systems and plasma glucose levels of the winter bullfrog Rana catesbeiana. Body temperature was maintained at 10, 15, 25 and 35oC for measurements of breathing frequency, heart rate, arterial blood pressure, metabolic rate, plasma glucose levels, blood gases and acid-base status. Reducing body temperature from 35 to 10oC decreased (P&amp;lt;0.001) heart rate (bpm) from 64.0 ± 3.1 (N = 5) to 12.5 ± 2.5 (N = 6) and blood pressure (mmHg) (P&amp;lt;0.05) from 41.9 ± 2.1 (N = 5) to 33.1 ± 2.1 (N = 6), whereas no significant changes were observed under hypoxia. Hypoxia-induced changes in breathing frequency and acid-base status were...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Temperature; Hypoxia; Rana; Breathing frequency; Blood pressure; Heart rate; Acid-base status; Hyperglycemia.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1997000100019

Differences in pressure and temperature transitions of proteins and polymer gels
Provedor de dados: 56
Autores: Kunugi,S.; Kameyama,K.; Tada,T.; Tanaka,N.; Shibayama,M.; Akashi,M.
Pressure-driven and temperature-driven transitions of two thermoresponsive polymers, poly(N-isopropylacrylamide) (pNIPAM) and poly(N-vinylisobutyramide) (pNVIBA)), in both a soluble linear polymer form and a cross-linked hydro-gel form, were examined by a dynamic light-scattering method and direct microscopic observation, respectively. Their behavior was compared with that of protein systems. Changes in some characteristic parameters in the time-intensity correlation functions of dynamic light-scattering measurement of aqueous solutions of pNIPAM at various pressures and temperatures showed no essential differences during temperature and pressure scanning and, as a whole, the motions of polymers in aqueous solutions were similar in two types of transitions...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pressure; Temperature; Denaturation; Transition; Proteins; Thermoresponsive polymers; Polymer gel.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2005000800011

Time collection and storage conditions of lipid profile
Provedor de dados: 56
Autores: França,C.N.; Mendes,C.C.; Ferreira,C.E.S.
The stability of samples is crucial for getting reliable concentrations of many analytes, including lipid profile. Thus, the goal of this study was to analyze lipid profile under different storage and temperature conditions. This was a prospective study with 809 patients of both genders. Total cholesterol, triglycerides, high-density lipoprotein cholesterol, low density lipoprotein cholesterol and non-high-density lipoprotein were measured within 1 h from collection at room temperature, after 2-3 h of refrigeration (8°C) and after 4-5 h at room temperature. The processing time and storage conditions did not affect the analytes measured. These findings are important for multicenter studies, because of the difficulties related to centrifugation and freezing...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lipid profile; Storage; Temperature; Stability; Refrigerator; Room temperature.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2018000300608

A time series analysis of meteorological factors and hospital outpatient admissions for cardiovascular disease in the Northern district of Guizhou Province, China
Provedor de dados: 56
Autores: Jie,Y.; Houjin,H.; Mengxue,Y.; Wei,Q.; Jie,X.
Findings on the effects of weather on health, especially the effects of ambient temperature on overall morbidity, remain inconsistent. We conducted a time series study to examine the acute effects of meteorological factors (mainly air temperature) on daily hospital outpatient admissions for cardiovascular disease (CVD) in Zunyi City, China, from January 1, 2007 to November 30, 2009. We used the generalized additive model with penalized splines to analyze hospital outpatient admissions, climatic parameters, and covariate data. Results show that, in Zunyi, air temperature was associated with hospital outpatient admission for CVD. When air temperature was less than 10°C, hospital outpatient admissions for CVD increased 1.07-fold with each increase of 1°C, and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Temperature; Cardiovascular disease; Hospital outpatient admission.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2014000800689

Pathogenicity characteristics of stocked and fresh yeasts strains
Provedor de dados: 58
Autores: Chaves,Guilherme Maranhão; Cavalcanti,Maria Auxiliadora de Queiroz; Porto,Ana Lúcia Figueiredo.
In order to evaluate the pathogenicity of yeasts of medical importance, 15 strains stocked in mineral oil at the URM Culture Collection of the Department of Mycology, Biological Sciences Centre, Federal University of Pernambuco and 15 fresh strains isolated from AIDS patients interned at the Clinical Hospital, Centre of Health Sciences, Federal University of Pernambuco, were selected. As pathogenicity characteristics, the ability to grow at 37ºC and production of phospolipase and proteinase were tested. All samples grew at 37ºC and exhibited proteinase activity. However when tested on solid medium, the proteinase activity was negative. Among 15 stocked samples, 13 (86.66%) were phospholipase positive and two (13.34%) were phospholipase negative. From the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Yeasts; Pathogenicity; Temperature; Phospholipase; Proteinase.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822003000300003

Effects of growth temperature on polystyrene adhesion of Pseudomonas aeruginosa ATCC 27853
Provedor de dados: 58
Autores: Cappello,Simone; Guglielmino,Salvatore P.P.
The importance of avoiding bacterial adhesion to plastic medical devices is recognized. To better understand the interaction between bacteria and surface, we studied the influence of different growth temperatures (15, 30 and 47ºC) on the polystyrene adhesion capacity of Pseudomonas aeruginosa ATCC 27853.
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Pseudomonas aeruginosa; Temperature; Hydrophobicity; Adhesion.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822006000300001

Formation of biofilm by Listeria monocytogenes ATCC 19112 at different incubation temperatures and concentrations of sodium chloride
Provedor de dados: 58
Autores: Lee,H.Y.; Chai,L.C.; Pui,C.F.; Mustafa,S.; Cheah,Y.K.; Nishibuchi,M.; Radu,S.
Biofilm formation can lead to various consequences in the food processing line such as contamination and equipment breakdowns. Since formation of biofilm can occur in various conditions; this study was carried out using L. monocytogenes ATCC 19112 and its biofilm formation ability tested under various concentrations of sodium chloride and temperatures. Cultures of L. monocytogenes ATCC 19112 were placed in 96-well microtitre plate containing concentration of sodium chloride from 1-10% (w/v) and incubated at different temperature of 4 ºC, 30 ºC and 45 ºC for up to 60 h. Absorbance reading of crystal violet staining showed the density of biofilm formed in the 96-well microtitre plates was significantly higher when incubated in 4 ºC. The formation of biofilm...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Listeria monocytogenes; Biofilm; Sodium chloride; Temperature; Microtiter plate.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822013000100007

Culture Conditions stimulating high γ-Linolenic Acid accumulation by Spirulina platensis
Provedor de dados: 58
Autores: Ronda,Srinivasa Reddy; Lele,S.S.
Gamma-linolenic acid (GLA) production by Spirulina platensis under different stress-inducing conditions was studied. Submerged culture studies showed that low temperature (25ºC), strong light intensity (6 klux) and primrose oil supplement (0.8%w/v) induced 13.2 mg/g, 14.6 mg/g and 13.5 mg linolenic acid per gram dry cell weight respectively. A careful observation of fatty acid profile of the cyanobacteria shows that, oleic acid and linoleic acid, in experiments with varying growth temperature and oil supplements respectively, helped in accumulating excess γ-linolenic acid. In addition, cultures grown at increasing light regimes maintained the γ-linolenic acid to the total fatty acid ratio(GLA/TFA) constant, despite any change in γ-linolenic acid content of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gamma linolenic acid; Light intensity; Oil supplementation; Temperature.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822008000400018

Comparative study of the pathogenicity of seabed isolates of Fusarium equiseti and the effect of the composition of the mineral salt medium and temperature on mycelial growth
Provedor de dados: 58
Autores: Palmero,D; Cara,M. de; Iglesias,C; Gálvez,L; Tello,J.C.
The pathogenicity of seven strains of Fusarium equiseti isolated from seabed soil was evaluated on different host plants showing pre and post emergence damage. Radial growth of 27 strains was measured on culture media previously adjusted to different osmotic potentials with either KCl or NaCl (-1.50 to - 144.54 bars) at 15º, 25º and 35º C. Significant differences and interactive effects were observed in the response of mycelia to osmotic potential and temperature.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Salinity; Sodium chloride; Potassium chloride; Osmotic pressure; Temperature.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822011000300013

Impact of environmental stress on biochemical parameters of bacteria reducing chromium
Provedor de dados: 58
Autores: Batool,Rida; Yrjälä,Kim; Hasnain,Shahida.
Chromium pollution is produced in connection with industrial processes like in tanneries. It has been suggested that bioremediation could be a good option for clean up. The stress effect of variable chromate levels, pHs and growth temperatures on biochemical parameters of two Cr(VI) reducing bacterial strains Pseudomonas aeruginosa Rb-1 and Ochrobactrum intermedium Rb-2 was investigated. Transmission electrone microscopy (TEM) was performed to study the intracellular distribution of Cr(VI). It was observed that initial stress of 1000 µgmL-1 caused significant enhancement of all studied biochemical parameters at pH 7.0 and growth temperature of 37 °C showing great bioremediation potential of the strains. Transmission electron microscopy revealed that the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cr(VI); PH; Temperature; Biochemical parameters; TEM; FTIR spectroscopy.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822014000200028

Effect of combined function of temperature and water activity on the growth of Vibrio harveyi
Provedor de dados: 58
Autores: Zhou,Kang; Gui,Meng; Li,Pinglan; Xing,Shaohua; Cui,Tingting; Peng,Zhaohui.
Vibrio harveyi is considered as a causative agent of the systemic disease, vibriosis, which occurs in many biological fields. The effects of temperatures (12.9-27.1 ºC) and water activity (NaCl% 0.6%-3.4%) on V. harveyi were investigated. The behavior and growth characteristics of V. harveyi was studied and modeled. Growth curves were fitted by using Gompertz and Baranyi models, and the Baranyi model showed a better fittness. Then, the maximum growth rates (µmax) and lag phase durations (LPD, λ) obtained from both Gompertz and Baranyi model were modeled as a combination function of temperature and water activity using the response surface and Arrhenius-Davey models for secondary model. The value of r², MSE, bias and accuracy factor suggest Baranyi model...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vibrio harveyi; Modelling; Temperature; Water activity.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822012000400018

Growth of Aspergillus ochraceus, A. carbonarius and A. niger on culture media at different water activities and temperatures
Provedor de dados: 58
Autores: Palacios-Cabrera,Héctor; Taniwaki,Marta Hiromi; Hashimoto,Jorge Minoru; Menezes,Hilary Castle de.
The objective of this paper was to determine the influence of three culture media with different water activities, times of incubation and temperatures on the growth of A. ochraceus, A. carbonarius and A. niger. Spores of A. ochraceus, A. carbonarius and A. niger were inoculated onto three culture media: Czapeck Yeast extract Agar (CYA), Dichloran 18% Glycerol Agar (DG18) and Malt Yeast extract 40% Glucose Agar (MY40G). The plates were incubated at five different temperatures (8, 25, 30, 35 and 41ºC). The growth of fungi was evaluated every 24h, measuring the colony diameter (mm). None of the species grew at 8ºC in any culture media. For A. carbonarius, 30ºC was the best temperature for growth while for A. niger temperatures above 30ºC were better in all...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aspergillus ochraceus; Aspergillus carbonarius; Aspergillus niger; Growth measurement; Water activity; Temperature.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822005000100005

Growth and content of Spirulina platensis biomass chlorophyll cultivated at different values of light intensity and temperature using different nitrogen sources
Provedor de dados: 58
Autores: Danesi,Eliane Dalva Godoy; Rangel-Yagui,Carlota Oliveira; Sato,Sunao; Carvalho,João Carlos Monteiro de.
The effects of light intensity and temperature in S. platensis cultivation with potassium nitrate or urea as nitrogen source were investigated, as well as the biomass chlorophyll contents of this cyanobacteria, through the Response Surface Methodology. Experiments were performed at temperatures from 25 to 34.5ºC and light intensities from 15 to 69 µmol photons m-2 s-1, in mineral medium. In cultivations with both sources of nitrogen, KNO3 and urea, statistic evaluation through multiple regression, no interactions of such independent variables were detected in the results of the dependent variables maximum cell concentration, chlorophyll biomass contents, cell and chlorophyll productivities, as well as in the nitrogen-cell conversion factor. In cultivation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Spirulina platensis; Light intensity; Temperature; Nitrogen sources; Chlorophyll.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822011000100046

Effect of surfactants and temperature on germination and vegetative growth of Beauveria bassiana
Provedor de dados: 58
Autores: Mwamburi,Lizzy A.; Laing,Mark D.; Miller,Ray M.
Three non-ionic surfactants: Tween20, Tween80 and Breakthru® were screened for their effects on spore germination and mycelial growth rates and for their influence on three isolates of Beauveria bassianaspore germination at various temperatures. Tween20 and Tween80 were compatible with all the B. bassiana isolates in the germination studies, but inhibited germination at higher surfactant concentrations, irrespective of the conidial concentrations. Breakthru® had an inhibitory effect on germination even at the lowest concentration of 0.1% on all the B. bassiana isolates. The effects of the surfactants on spore germination did not correspond with their effects on colony growth. Conidial viability within the same formulation declined significantly with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beauveria bassiana; Surfactant; Temperature; Conidia germination; Mycelial growth.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822015000100067

Seasonality of viral respiratory infections in Southeast of Brazil: the influence of temperature and air humidity
Provedor de dados: 58
Autores: Gardinassi,Luiz Gustavo; Simas,Paulo Vitor Marques; Salomão,João Batista; Durigon,Edison Luiz; Trevisan,Dirce Maria Zanetta; Cordeiro,José Antonio; Lacerda,Mauricio Nogueira; Rahal,Paula; Souza,Fátima Pereira de.
Viruses are the major cause of lower respiratory tract infections in childhood and the main viruses involved are Human Respiratory Syncytial Virus (HRSV), Human Metapneumovirus (HMPV), Influenzavirus A and B (FLUA and FLUB), Human Parainfluenza Virus 1, 2 and 3 (HPIV1, 2 and 3) and Human Rhinovirus (HRV). The purposes of this study were to detect respiratory viruses in hospitalized children younger than six years and identify the influence of temperature and relative air humidity on the detected viruses. Samples of nasopharyngeal washes were collected from hospitalized children between May/2004 and September/2005. Methods of viral detection were RT-PCR, PCR and HRV amplicons were confirmed by hybridization. Results showed 54% (148/272) of viral positivity....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Viral Respiratory Infections; HRSV; HRV; Temperature; Relative Air Humidity.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822012000100011

Isolation and molecular characterization of Thraustochytrium strain isolated from Antarctic Peninsula and its biotechnological potential in the production of fatty acids
Provedor de dados: 58
Autores: Caamaño,Esteban; Loperena,Lyliam; Hinzpeter,Ivonne; Pradel,Paulina; Gordillo,Felipe; Corsini,Gino; Tello,Mario; Lavín,Paris; González,Alex R.
ABSTRACT Thraustochytrids are unicellular protists belonging to the Labyrinthulomycetes class, which are characterized by the presence of a high lipid content that could replace conventional fatty acids. They show a wide geographic distribution, however their diversity in the Antarctic Region is rather scarce. The analysis based on the complete sequence of 18S rRNA gene showed that strain 34-2 belongs to the species Thraustochytrium kinnei, with 99% identity. The total lipid profile shows a wide range of saturated fatty acids with abundance of palmitic acid (16:0), showing a range of 16.1-19.7%. On the other hand, long-chain polyunsaturated fatty acids, mainly docosahexaenoic acid and eicosapentaenoic acid are present in a range of 24-48% and 6.1-9.3%,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Thraustochytrids; Antarctic; Docosahexaenoic acid; Eicosapentaenoic acid; Temperature.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822017000400671

Ecophysiology of tea
Provedor de dados: 61
Autores: De Costa,W.A. Janendra M.; Mohotti,A. Janaki; Wijeratne,Madawala A.
Tea [Camellia sinensis (L.) O. Kuntze] is one of the most important beverage crops in the world. The major tea-growing regions of the world are South-East Asia and Eastern Africa where it is grown across a wide range of altitudes up to 2200 m a.s.l.. This paper reviews the key physiological processes responsible for yield determination of tea and discusses how these processes are influenced by genotypic and environmental factors. Yield formation of tea is discussed in terms of assimilate supply through photosynthesis and formation of harvestable sinks (i.e. shoots). The photosynthetic apparatus and partial processes (i.e. light capture, electron transport and carboxylation) of tea show specific adaptations to shade. Consequently, maximum light-saturated...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Climate change; Photoinhibition; Photosynthesis; Shoot growth; Temperature; Vapour pressure deficit; Water potential.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202007000400005

Photosynthetic characteristics of a tropical population of Nitella cernua (Characeae, Chlorophyta)
Provedor de dados: 61
Autores: Vieira Jr.,Jair; Necchi Jr.,Orlando.
Photosynthetic characteristics (assessed by chlorophyll fluorescence and O2 evolution) were analysed monthly during one year in a tropical population of Nitella cernua from southeastern Brazil (20º50'32" S, 49º26'15" W). Parameters derived from photosynthesis-irradiance (PI) curves by fluorescence (high values of the photosynthetic parameter, Ik, and lack or low values of photoinhibition, beta) suggested adaptation to high irradiance, whereas those by O2 evolution showed a different pattern (low values of Ik and compensation irradiance, Ic, high values of photosynthetic efficiency, alpha, and photoinhibition). Parameters from PI curves by O2 evolution suggested light acclimation: Ik and maximum photosynthetic rate, Pmax (as rETR, relative electron transfer...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Charophytes; Irradiance; Nitella; PH; Photosynthesis; Seasonal dynamics; Temperature.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202006000300004

Seed germination in Cerrado species
Provedor de dados: 61
Autores: Zaidan,Lilian B. P.; Carreira,Rosana C.
The aim of this review is to comment on the available data about germination of seeds from herb, shrub and tree species of the Cerrado after the publication of the review written by Felippe and Silva in 1984. Studies on seed germination of herbaceous species focused mainly on the responses of seeds to light, different ranges of temperature and storage in the soil. The majority of seeds from herb species germinate between 20°C and 30°C, and are photoblastic. Alternate temperatures favored germination in some seeds, but changed light sensitivity of the achenes of Bidens gardneri. Seeds of most of the shrub species of Melastomataceae are positive photoblastic; among the Velloziaceae, germination in the dark was observed in some species. Other shrub species...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dormancy; Photoblastism; Soil seed bank; Temperature.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202008000300002

High temperature effects on the response of photosynthesis to light in sweet orange plants infected with Xylella fastidiosa
Provedor de dados: 61
Autores: Ribeiro,Rafael Vasconcelos; Machado,Eduardo Caruso; Oliveira,Ricardo Ferraz de; Pimentel,Carlos.
The objective of this study was to evaluate the high temperature effects on the response of photosynthesis to light in sweet orange plants infected with Xylella fastidiosa. This vascular bacterium is the causal agent of the citrus variegated chlorosis that causes severe economical losses to the Brazilian citrus industry. The responses of the photosynthetic oxygen evolution and the parameters related to chlorophyll a fluorescence to the increase in light intensity were evaluated at 35ºC and 45ºC in both healthy and infected leaf discs. The increase in temperature affected the photosynthetic apparatus of both healthy and infected plants, although infected plants showed higher photochemical sensitivity at the higher temperature (e.g. in the potential quantum...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chlorophyll fluorescence; Citrus sinensis; Light response curve; Photosynthesis; Temperature; Xylella fastidiosa.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202003000200004

Environmental physiology of the bananas (Musa spp.)
Provedor de dados: 61
Autores: Turner,David W.; Fortescue,Jeanie A.; Thomas,Dane S.
The bananas are thought to be particularly sensitive to changes in the environment. This review considers some historical and recent investigations into the response of the leaf, root and reproductive system to the environment. Monteith's analysis of the response of plants to intercepted radiation is appropriate for analyzing the productivity of bananas and plantains. The banana is sensitive to soil water deficits, and expanding tissues such as emerging leaves and growing fruit are among the first to be affected. As soil begins to dry, stomata close and leaves remain highly hydrated, probably through root pressure. Productivity is affected because of the early closure of stomata. We find the common belief that bananas use large amounts of water does not...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crop yield; Leaf system; Light; Photoperiod; Photosynthesis; Reproductive system; Root system; Temperature; Water supply.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202007000400013

Changes in growth and superoxide dismutase activity in Hydrilla verticillata L. under abiotic stress
Provedor de dados: 61
Autores: Panda,Sanjib Kumar; Khan,Mohammad Hussain.
A study was made of the role of various heavy metals (chromium, zinc, copper and cadmium) together with the effects of NaCl-salinity, PEG-mediated water stress and temperature on growth and superoxide dismutase (SOD) activity in hydrilla (Hydrilla verticillata L.). Almost all metals studied reduced growth but presented a modulatory effect at lower concentrations. NaCl-salinity, water stress and temperature treatments also reduced growth. SOD activity was inhibited by both chromium and zinc but increased by copper and cadmium. NaCl-salinity increased SOD activity while water stress decreased it. SOD showed thermostability with a higher activity being recorded at 45ºC.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Growth; Heavy metals; NaCl; PEG; Superoxide dismutase; Temperature.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202004000200007

Impact of climate change on oil fatty acid composition of peanut (Arachis hypogaea L.) in three market classes
Provedor de dados: 117
Autores: Onemli,Fadul.
Peanut (Arachis hypogaea L.) is one of the most important oilseed crops of the world. The fatty acid composition plays an important role in oil quality. Experiments were performed to examine the variation in oil fatty acids of three normal oleic peanut market types (Virginia, Valencia, and Spanish) in 2008, 2009, and 2010. Variations of botanical variety, year and their interaction were highly significant for oil content and all 13 fatty acids studied. Oil content in different peanut market types exhibited significant differences. The maximum oil content (51.993%) was found in Virginia (NC-7), while Valencia (New Mexico Valencia A) accumulated the minimum oil content (47.197%). Virginia had also the highest oleic acid percentage. Higher temperatures during...
Tipo: Journal article
Palavras-chave: Arachis hypogaea subsp. fastigiata; Temperature; Correlation.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000400004

Biological characteristics of Palmistichus elaeisis Delvare &amp;amp; LaSalle (Hymenoptera: Eulophidae) on refrigerated pupae of Anticarsia gemmatalis Hubner (Lepidoptera: Noctuidae)
Provedor de dados: 117
Autores: Pereira,Fabricio Fagundes; Cola Zanuncio,José; Oliveira Kassab,Samir; Pastori,Patrik Luiz; Hidalgo Barbosa,Rogério; Rossoni,Camila.
Mass rearing of parasitoids is a fundamental step for biological control programs. The biological characteristics of Palmistichus elaeisis Delvare &amp;amp; LaSalle (Hymenoptera: Eulophidae) were evaluated in pupae of Anticarsia gemmatalis Hubner (Lepidoptera: Noctuidae) stored at low temperatures. Twenty four hours-old pupae of A. gemmatalis were stored at 12 °C for 0, 1, 3, 6, 9, and 12 d and then exposed to parasitism by P. elaeisis females. The life span of P. elaeisis was affected and ranged from 19 to 24 d on the pupae of the host. Parasitism reached 100% of the host pupae after storage in all periods at 12 °C, and adults emerged from 20.00 to 54.54% of them. The progeny of P. elaeisis ranged from 71 to 198 and had an inverse relationship with the...
Tipo: Journal article
Palavras-chave: Biological control; Parasitism; Parasitoid rearing; Temperature.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392013000200005

Antioxidant activity of corn seeds after thermal stress
Provedor de dados: 65
Autores: Marini,Patrícia; Bandeira,Juliana de Magalhães; Borba,Isabel Cristina Gouvea de; Martins,Andrea Bicca Noguez; Moraes,Dario Munt de; Amarante,Luciano do; Villela,Francisco Amaral.
The aim of this research was to analyze the effect of different temperatures on physiological quality and relate the responses with the antioxidant activity of three lots of corn seeds. The seeds from three lots were exposed for 24h at temperatures of 15, 25, 35 and 40°C and then evaluated for percentage, speed index and first germination count, as well as early growth and activity of antioxidant enzymes in the seedlings. The experimental design was completely randomized with four replications, with subsequent polynomial regression analysis. The results showed that the seeds from the three lots of corn exposed to temperatures of 15 and 40°C, were of better high physiological quality (vigor), which explains the low activity of enzymes of the antioxidant...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Temperature; Germination; Growth.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782013000600002

Estimated phyllochron in low tunnel cultivated strawberry cultivars
Provedor de dados: 65
Autores: Cocco,Kassia Luiza Teixeira; Schmidt,Denise; Caron,Braulio Otomar; Souza,Velci Queiroz de; Fontana,Daniele Cristina; Paula,Gizelli Moiano de.
ABSTRACT: The aim of this study was to determine phyllochron in strawberry cultivars, from two origins during two crop years, conducted in low tunnel. Experiments were conducted at the Universidade Federal de Santa Maria, campus Frederico Westphalen (CESNORS/UFSM), Brazil, evaluating 'Camarosa', 'Camino Real' and 'Albion' strawberry cultivars. During the 2012 crop year, seedlings from Chile and Pelotas/RS, Brazil were evaluated, for the 2013 crop year, only seedlings from Chile were submitted to evaluations. In order to determine the phyllochron, twice a week the numbers of leaves (NL) of the main crown were counted and a regression between NL and accumulated thermal time (ATT) was held. The experimental design was a complete randomized block, with three...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fragaria x ananassa; Leaf appearance; Number of leaves; Temperature; Thermal time.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016000901546

A generalized nonlinear tempeature response function for some growth and developmental parameters in kiwifruit (Actinidia deliciosa (A. Chev.) C. F. Liang &amp;amp; A. R. Ferguson)
Provedor de dados: 65
Autores: Streck,Nereu Augusto.
Temperature is a major factor that affects metabolic processes in living organisms. Thermal time has been widely used to account for the effects of temperature on crop growth and development. However, the thermal time approach has been criticized because it assumes a linear relationship between the rate of crop growth or development and temperature. The response of the rate of crop growth and development to temperature is nonlinear. The objective of this study was to develop a generalized nonlinear temperature response function for some growth and developmental parameters in kiwifruit (Actinidia deliciosa (A. Chev.) C. F. Liang &amp;amp; A. R. Ferguson). The nonlinear function has three coefficients (the cardinal temperatures), which were 0ºC, 25ºC, and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Temperature; Model; Growth; Development; Kiwifruit.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782003000200012

Sealing type effect on corn silage quality in bunker silos
Provedor de dados: 65
Autores: Neumann,Mikael; Leão,Guilherme Fernando Mattos; Askel,Eloize Jaqueline; Marafon,Fabiano; Figueira,Danúbia Nogueira; Poczynek,Mailson.
ABSTRACT: Forage conservation in silos depends on the efficiency of silo sealing, among other factors, to minimize aerobic deterioration and consequent qualitative and quantitative losses in silage. Thus, the aim of the present study was to evaluate the effect of two sealing types on dry matter recovery rate, aerobic stability, nutritional composition, and in vitro digestibility of corn silage in bunker silos: 110-µm-thick double-sided polyethylene sealing (conventional sealing) and110-µm-thick double-sided polyethylene sealing superimposed on 111-µm-thick translucent polyethylene sealing (double sealing). There were no significant differences in nutritional composition of silages between conventional and double sealing. However, the double sealing system...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Neutral-detergent fiber digestibility; Aerobic deterioration; Dry matter recovery; Temperature.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000500654

Dynamics of change in fermentation and fatty acid profiles in high moisture alfalfa silage during ensiling at different temperatures
Provedor de dados: 65
Autores: Liu,Qinhua; Dong,Zhihao; Shao,Tao.
ABSTRACT: The objective of present study was to investigate the dynamics of change in fermentation and fatty acid profiles in high moisture (DM=232g/kg FW) alfalfa silages during ensiling at 45°C, 30°C and 15°C. After ensiling for 1, 3, 7, 21, 39 and 65 days, silages was sampled and examined. Lactic fermentation changing into butyric fermentation in silage ensiled at 30°C and 45°C occurred on ensiling for 21 and 65 days, respectively, as accompanied with high ammonia-N content ( &gt;150g/kg N), which subsequently resulted in a sudden increase of pH (P &lt; 0.05). In contrast, the increase of lactic acid content was observed in silage ensiled at 15°C during ensiling for 65 days (P&lt;0.05). As the ensiling temperature rose, considerable losses in total FA,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Silage; Fermentation quality; Fatty acid; Temperature.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018000300652

Physical-chemical analysis of the cerebrospinal fluid of healthy dogs submitted to different storage periods and temperatures
Provedor de dados: 65
Autores: Rosato,Paula Nunes; Gama,Fernanda Gomes Velasque; Santana,Aureo Evangelista.
Disorders involving the nervous system have a great importance in veterinary medicine because they have a high incidence and few auxiliary tools for their diagnostic, prognostic and evaluation of the employed therapy. Today, the diagnostic is based, mainly, on the patient history and neurologic examination. Hence, evaluation of the cerebrospinal fluid elements is one of the few alternatives to clinically access the central nervous system (CNS). Even with the great usefullness of the physical-chemical and cytoscopy exams of the CSF in veterinary neurology, there are few studies concerning the stability of its elements under freezing storage. The present study was aimed at verifing the influence of temperature and period of conservation on physical-chemical...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cerebrospinal fluid; Dogs; Storage; Temperature.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782006000600021

Expolinear model on soybean growth in Argentina and Brazil
Provedor de dados: 65
Autores: Confalone,Adriana Elisabet; Bernardes,Marcos Silveira; Costa,Luiz Claudio; Righi,Ciro Abbud; Dourado Neto,Durval; Martin,Thomas Newton; Manfron,Paulo Augusto; Pereira,Carlos Rodrigues.
Predicting crop growth and yield with precision are one of the main concerns of the agricultural science. For these purpose mechanistic models of crop growth have been developed and tested worldwide. The feasibility of an expolinear model for crop growth was evaluated on predicting growth modification on soybean (Glycine max L. Merrill) of determined and undetermined growth cultivars, submitted to water restrictions imposed on different phenological stages. An experiment was carried out in Azul/Argentina and in Viçosa/Brazil during the growing seasons (1997/1998, 1998/1999 and 2002/2003). The expolinear model was adjusted to the dry-matter data obtained from each treatment. The model showed sensibility of Rm (maximum relative growth rate of the culture - g...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water deficit; Solar radiation; Temperature; Phenological phase.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782010000500002

Behavior of Staphylococcus aureus and autochthone microbiota in fresh sausages added of sodium nitrite and stored under refrigeration
Provedor de dados: 65
Autores: Correia,Lucyanne Maria Moraes; Pereira,Juliano Gonçalves; Pinto,José Paes de Almeida Nogueira; Barcellos,Vinicius Cunha; Bersot,Luciano dos Santos.
Fresh sausages are cured meat products that may be contaminated with Staphylococcus aureus during the manufacturing procedure, which is frequently related with inadequate handling practices. The use of nitrite in meat products has proven efficacy against Clostridium botulinum, and studies indicate that bactericidal action against S. aureus depends on factors that are intrinsic and extrinsic to the product. The objective of the present study was to evaluate the effect of nitrite concentration, and pH on S. aureus and psychrotrophic autochthone microbiota in fresh sausages stored at different times and temperatures. Fresh sausage were produced at nitrite concentrations 50, 150 and 200ppm and contaminated with S. aureus. The sausages were storage at...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fresh sausage; Nitrite; Psychrotrophic; S. aureus; Temperature.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782014001001880

Production of biquinho pepper in different growing seasons characterized by the logistic model and its critical points
Provedor de dados: 65
Autores: Diel,Maria Inês; Lúcio,Alessandro Dal’Col; Valera,Oscar Valeriano Sanchéz; Sari,Bruno Giacomini; Olivoto,Tiago; Pinheiro,Marcos Vinícius Marques; Melo,Patrícia Jesus de; Tartaglia,Francieli de Lima; Schmidt,Denise.
ABSTRACT: The objective of this study was to characterize the production of biquinho pepper through the interpretation of parameter estimates from the logistic model and its critical points obtained by the partial derivatives of the function, and to indicate the best cultivar and growing season for subtropical climate sites. For this, a 2x3 factorial experiment was conducted with two cultivars of biquinho pepper (BRS Moema and Airetama biquinho) in three growing seasons (E1: October 2015, E2: November 2015, E3: January 2016). The logistic non-linear model for fruit mass was specified as a function of the accumulated thermal sum, and the critical points were calculated through the partial derivatives of the model, in order to characterize the productive...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Capsicum chinense; Temperature; Fruit mass; Non-linear model.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782020000400202

A temperature response function for modeling leaf growth and development of the African violet (Saintpaulia ionantha Wendl.)
Provedor de dados: 65
Autores: Streck,Nereu Augusto.
Response functions used in crop simulation models are usually different for different physiological processes and cultivars, resulting in many unknown coefficients in the response functions. This is the case of African violet (Saintpaulia ionantha Wendl.), where a generalized temperature response for leaf growth and development has not been developed yet. The objective of this study was to develop a generalized nonlinear temperature response function for leaf appearance rate and leaf elongation rate in African violet. The nonlinear function has three coefficients, which are the cardinal temperatures (minimum, optimum, and maximum temperatures). These coefficients were defined as 10, 24, and 33ºC, based on the cardinal temperatures of other tropical...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Temperature; Model; Leaf growth; Leaf development; African violet.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782004000100009

Phenology and biometry of physic nut in the brazilian savannah
Provedor de dados: 64
Autores: Gurgel,Fábio de Lima; Laviola,Bruno Galvêas; Silva,Daniel Medeiros da; Kobayashi,Adilson Kenji; Rosado,Tatiana Barbosa.
Phenological studies on three morphologically distinct accessions of physic nut (Jatropha curcas L.) were conducted in the Brazilian Savannah biome. Plant growth rate, flowering, fruit formation and development were measured in order to establish appropriate management practices for increasing productivity. The accessions CNPAE-102 (toxic and susceptible to powdery mildew), CNPAE-169 (non-toxic and susceptible to powdery mildew) and CNPAE-259 (toxic and resistant to powdery mildew) were studied. Accessions with undetectable levels of phorbol ester in the grains were considered as non-toxic. The agronomic variables (plant height, number of inflorescences, number of green and ripe fruits per plant) from each accession were measured biweekly during one year...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Growth rate; Flowering; Fruiting; Temperature.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542011000600012

Growth and survival of tilapia Oreochromis niloticus (Linnaeus, 1758) submitted to different temperatures during the process of sex reversal
Provedor de dados: 64
Autores: Drummond,Cristina Delarete; Murgas,Luis David Solis; Vicentini,Bruno.
The objective of this research was to evaluate the sex reversal technique using 17α--methyltestosterone (MT) hormone, submitted to temperature modification of fry Nilo tilapia storage, aiming to get the data of sex reversal combined with growth performance and fry survival. The experiment was performed at UFLA Fish Culture Station, using tilapia fry (0,008 ± 0.002 g e 0,9 ± 0.1 cm) obeying a totally randomized experimental delineation in a factorial scheme 4x4, in 4 temperatures (26º, 28º, 30º, 32ºC) and 4 hormonal doses (0, 20, 40, 60mg of MT/kg of ration) during 28 days, with 5 repetitions. As temperature raised, weight gain rate, size and survival increased (p&lt;0.01); however, this temperature raise was not effective in modifying males ratio...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tilapia; 17α-methyltestosterone; Temperature.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542009000300033

Behavior of a portable solar dryer for pineapple fiber
Provedor de dados: 64
Autores: Moya,Róger; Solano,Marco.
In Costa Rica, there has been a growing interest to use pineapple fiber from plant, for which current processes need to be improved or new processes need to be developed, with emphasis on drying methods. This work presents the design and evaluation of the behavior of a prototype portable solar dryer in four sites of Costa Rica. The design describes the main parts of the dryer, as well as how they were constructed. The behavior was evaluated according to temperature and relative humidity inside e outside the chamber, and the influence of direct and indirect solar radiation. In order to achieve improved dryer efficiency, a dehumidifier was used to control relative humidity, and a heating system was implemented during the hours of low temperature, low solar...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Air drying; Relative humidity; Moisture content; Temperature; Solar radiation.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542012000600009

Efficiency of oxygen: absorbing sachets in different relative humidities and temperatures
Provedor de dados: 64
Autores: Cruz,Renato Souza; Soares,Nilda de Fátima Ferreira; Andrade,Nélio José de.
The main objective of this work was to evaluate the efficiency of oxygen - absorbing sachets at relative humidity of 75%, 80% and 85% and different temperatures, 10±2 ºC and 25±2 ºC. The experiment consisted in determining the O2 absorption under these conditions. A sachet was placed in desiccators with an internal air homogenization system. Aliquots of air were removed at pre-established time intervals and analyzed for oxygen content. The results showed that oxygen absorption by the sachet increased as the relative humidity increased for both temperature. Therefore the oxygen - absorbing sachets were most active under 25±2ºC and 85% relative humidity. At ambient condition (25±2ºC/75%RH) the rate of oxygen absorbed was 50 mL/day and 18,5 mL/day for 10±2ºC....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Active packaging; Oxygen - absorbing; Relative humidity; Temperature.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542007000600029

Calibration methods for the Hargreaves-Samani equation
Provedor de dados: 64
Autores: Ferreira,Lucas Borges; Cunha,Fernando França da; Duarte,Anunciene Barbosa; Sediyama,Gilberto Chohaku; Cecon,Paulo Roberto.
ABSTRACT The estimation of the reference evapotranspiration is an important factor for hydrological studies, design and management of irrigation systems, among others. The Penman Monteith equation presents high precision and accuracy in the estimation of this variable. However, its use becomes limited due to the large number of required meteorological data. In this context, the Hargreaves-Samani equation could be used as alternative, although, for a better performance a local calibration is required. Thus, the aim was to compare the calibration process of the Hargreaves-Samani equation by linear regression, by adjustment of the coefficients (A and B) and exponent (C) of the equation and by combinations of the two previous alternatives. Daily data from 6...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Evapotranspiration; Irrigation; Temperature; Agrometeorology.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542018000100104