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| Registros recuperados: 473 | |
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| 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 |
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| 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... |
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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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| Registros recuperados: 473 | |
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