Consulta: subjectFacets:"Light intensity"
Registros recuperados: 23
Data/hora: 09/06/2024 17:15:14

Intensidad luminosa y ácido giberélico en la producción de anturio para flor de corte.
Provedor de dados: Depósito Institucional Abierto de Documentos Digitales del Colegio de Postgraduados (COLPOS DIGITAL )
Autores: Rangel Estrada, Sandra Eloisa.
El anturio (Anthurium andraeanum Linden ex André) es una planta tropical que en su hábitat natural crece bajo la sombra de árboles y sus inflorescencias vistosas con larga vida en florero la ubican dentro de las más caras en el mercado de flores de corte en México y a escala mundial. En nuestro país se considera una especie ornamental no tradicional por lo que se desconocen muchos aspectos sobre los requerimientos de su cultivo. En la presente investigación, realizada en Fortín de las Flores, Veracruz, se estudiaron los efectos producidos por tres intensidades luminosas (256, 290 y 364 μmol m-2 s-1) proporcionadas por mallas sombra comerciales y la aplicación foliar del ácido giberélico (AG3) en el desarrollo, rendimiento y calidad de las inflorescencias...
Palavras-chave: Anthurium andraeanum; Antocianinas; Flor de corte; Vida florero; Intensidad luminosa; Anthocyanin; Cut flower; Vase life; Light intensity; Doctorado; Fisiologia vegetal.
Ano: 2011
URL: http://hdl.handle.net/10521/520

Intensidad luminosa y ácido giberélico en la producción de anturio para flor de corte.
Provedor de dados: Depósito Institucional Abierto de Documentos Digitales del Colegio de Postgraduados (COLPOS DIGITAL )
Autores: Rangel Estrada, Sandra Eloisa.
El anturio (Anthurium andraeanum Linden ex André) es una planta tropical que en su hábitat natural crece bajo la sombra de árboles y sus inflorescencias vistosas con larga vida en florero la ubican dentro de las más caras en el mercado de flores de corte en México y a escala mundial. En nuestro país se considera una especie ornamental no tradicional por lo que se desconocen muchos aspectos sobre los requerimientos de su cultivo. En la presente investigación, realizada en Fortín de las Flores, Veracruz, se estudiaron los efectos producidos por tres intensidades luminosas (256, 290 y 364 μmol m-2 s-1) proporcionadas por mallas sombra comerciales y la aplicación foliar del ácido giberélico (AG3) en el desarrollo, rendimiento y calidad de las inflorescencias...
Palavras-chave: Anthurium andraeanum; Antocianinas; Flor de corte; Vida florero; Intensidad luminosa; Anthocyanin; Cut flower; Vase life; Light intensity; Doctorado; Fisiologia vegetal.
Ano: 2011
URL: http://hdl.handle.net/10521/520

The upstream sequence of the phycocyanin b subunit gene from Arthrospira platensis regulates expression of gfp gene in response to light intensity
Provedor de dados: Electronic Journal of Biotechnology
Autores: Yongzhong,Lu; Zhang,Xuecheng.
In cyanobacteria, few details are known of the mechanisms through which the expression of the light-harvesting pigment c-phycocyanin is regulated. In the present study, a 419 bp upstream sequence of the phycocyanin b subunit (cpcB) gene from Arthrospira platensis FACHB341 was fused with green fluorescent protein (gfp) gene, and a heterologous reporting system was built up to investigate the influence of light intensity on the expression of gfp gene, and the regulation function of different region of the upstream sequence of cpcB gene. Results showed that the upstream sequence of cpcB gene could drive the expression of gfp gene in Synechococcus sp. strain PCC7942, and the expression was influenced by light intensity, the lower the light intensity, the...
Tipo: Journal article
Palavras-chave: CpcB gene; Deletion analysis; Light intensity; Synechococcus; Transformation.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582005000100010

Production and quality of strawberry cultivated under different colors of low tunnel cover
Provedor de dados: Horticultura Brasileira
Autores: Henschel,Juliane M; Resende,Juliano TV; Giloni-Lima,Patrícia C; Zeist,André R; Lima Filho,Renato B; Santos,Matheus H.
ABSTRACT Strawberry is a crop of great economic and social importance. Its fruits are appreciated both for their flavor and nutraceutical potential. Some studies confirm that light quality influences plant physiology. Thus, the aim of this study was to investigate if changes in light spectrum, provided by low tunnels, can improve vegetative traits, as well as, production and fruit quality of strawberry. The authors used six tunnel covers (red, yellow, blue, green, transparent and opaque and one control, without cover), and two cultivars: a short photoperiod cultivar (Camarosa) and a neutral photoperiod cultivar (Albion). Experiment was evaluated in two seasons: production and plant development first; and then, post-harvest quality. Overall, Camarosa showed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fragaria ananassa; Light spectrum; Light intensity; Colored films; Photomorphogenesis; Photoperiod.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362017000300364

Carbon Orientation in the Diatom Phaeodactylum tricornutum: The Effects of Carbon Limitation and Photon Flux Density
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Heydarizadeh, Parisa; Veidi, Brigitte; Huang, Bing; Lukomska, Ewa; Wielgosz-collin, Gaetane; Couzinet-mossion, Aurélie; Bougaran, Gael; Marchand, Justine; Schoefs, Benoit.
Diatoms adapt to changing environmental conditions in very efficient ways. Among the mechanisms that can be activated, the reorientation of carbon metabolism is crucial because it allows the storage of energy into energy-dense molecules, typically lipids. Beside their roles in physiology, lipids are commercially interesting compounds. Therefore studies dealing with this topic are relevant for both basic and applied science. Although the molecular mechanisms involved in the reorientation of carbon metabolism as a response to a deficiency in nutrients such as nitrogen or phosphorus has been partially elucidated, the impacts of carbon availability on the implementation of the reorientation mechanisms remain unclear. Indeed, it has not been determined if the...
Tipo: Text
Palavras-chave: Diatom; Carbon deficiency; Carbon metabolism; Stress; Light intensity; Regulation; Biotechnology; Phosphoenolpyruvate.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00489/60058/63338.pdf

Impact of Light Intensity on Antioxidant Activity of Tropical Microalgae
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Coulombier, Noémie; Nicolau, Elodie; Le Déan, Loic; Antheaume, Cyril; Jauffrais, Thierry; Lebouvier, Nicolas.
Twelve microalgae species isolated in tropical lagoons of New Caledonia were screened as a new source of antioxidants. Microalgae were cultivated at two light intensities to investigate their influence on antioxidant capacity. To assess antioxidant property of microalgae extracts, four assays with different modes of action were used: 1,1-diphenyl-2-picrylhydrazyl (DPPH), 2,2’-azinobis (3-éthylbenzothiazoline-6-sulphonique) (ABTS), oxygen radical absorbance capacity (ORAC), and thiobabituric acid reactive substances (TBARS). This screening was coupled to pigment analysis to link antioxidant activity and carotenoid content. The results showed that none of the microalgae studied can scavenge DPPH and ABTS radicals, but Chaetoceros sp., Nephroselmis sp., and...
Tipo: Text
Palavras-chave: Nephroselmis; Light intensity; In vitro antioxidant activity; Siphonaxanthin; Carotenoid; Bioactive compounds.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00609/72152/70900.pdf

Field Observations on Circadian Activities of the Flying Squirrel, Pteromys volans orii
Provedor de dados: Obihiro University of Agriculture and Veterinary Medicine Academic Repository (OAK)
Autores: 山口, 裕司; 柳川, 久; Yamaguchi, Yuji; Yanagawa, Hisashi.
Palavras-chave: Pteromys volans orii; Onset and cessation of activity; Light intensity; Ambient temperature; Nocturnal activity pattern.
Ano: 1995
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/2460

International study on &lt;i&gt;Artemia&lt;/i&gt; : 15. Effect of light intensity on hatching rate of &lt;i&gt;Artemia&lt;/i&gt; cysts from different geographical origin
Provedor de dados: Open Marine Archive
Autores: Vanhaecke, P.; Cooreman, A.; Sorgeloos, P.
&lt;i&gt;Artemia cysts&lt;/i&gt; from 4 geographical strains were incubated under standard hatching rates increased with increasing light intensities. The light-intensity threshold at which the maximal hatching rate was attained, varied from strain to strain. Differences in light sensitivity between the &lt;i&gt;Artemia&lt;/i&gt; strains studied can, at least partly, be attributed to variation in chorion characteristics. The hypothesis is discussed that light might act as a diapause inhibitor in marine and freshwater branchiopods.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cysts; Hatching; Light intensity; Artemia.
Ano: 1981
URL: http://www.vliz.be/imisdocs/publications/262164.pdf

Performance of Broilers Reared under Monochromatic Light Emitting Diode Supplemental Lighting
Provedor de dados: Revista Brasileira de Ciência Avícola
Autores: Guevara,BDM; Pech,PS; Zamora,BR; Navarrete,SLF; Magaña,SHF.
ABSTRACT The purpose of this study was to evaluate the effect of green monochromatic light emitting diodes (LED) or white fluorescent lamps on the growth performance of broilers reared in open houses. Two hundred broilers (Ross 308) were sexed and divided into four treatments, according to sex and supplemental light source: T1, males under green LED; T2, males under fluorescent lamps; T3, females under green LED; and T4, females under fluorescent lamps, totaling 50 birds per treatment with five replicates each (n=10). Broilers of both sexes received natural light during the day and supplemental lighting (fluorescent or LED) during the night, according to age. Individual body weight, mortality, and feed intake were recorded weekly per replicate. Feed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Light Emitting Diode; Light intensity; Photoperiod; Light wavelength; Broiler.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2015000400553

Evaluation of different pre-slaughter light intensities and fasting duration in broilers
Provedor de dados: Revista Brasileira de Ciência Avícola
Autores: Ramão,IB; Nunes,RV; Bruno,LDG; Tsutsumi,CY; Silva,WTM; Pozza,MSS.
The aim of this study was to determine the effects of different levels of light intensity (0, 5 or 20 lx) and different pre-slaughter feed fasting duration (3, 6, 9, 12 and 15 hours) on the parameters body weight loss, carcass yield, commercial cuts yield, water carcass retention, bacterial counts and breast meat pH. A number of 72 broiler chickens at 45 days of age (Cobb 500 strain) was distributed in three chambers, in a total of 24 broilers per chamber. The results showed that feed fasting significantly influenced (p&lt;0.05) body weight losswhen broilers were submitted to 9 hours of fasting. Broilers kept in the chamber with 0 lx presented higher body weight loss compared with other light intensities. The results showed an increase in carcass yield...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bacterial counts; Carcass yield; Feed fasting; Light intensity.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2011000400003

Effects of Light Intensity on Growth, Anti-Stress Ability and Immune Function in Yellow Feathered Broilers
Provedor de dados: Revista Brasileira de Ciência Avícola
Autores: Guo,YL; Ma,SM; Du,JJ; Chen,JL.
ABSTRACT An experiment was conducted to investigate the effects of light intensity on growth, anti-stress ability, and immune function of yellow feathered broilers. A total of 480 one-day-old male Lingnan yellow feathered broilers were randomly allocated to 4 treatments based on light intensity (1, 5, 20 and 80 lx) with 8 replicates of 15 chicks each. The experiment lasted for 63 days. Compared with those under high light intensity, broilers exposed to low light intensity had higher (p&lt;0.05) total antioxidant capacity (T-AOC), glutathione peroxidase (GSH-Px), a-Naphthylacetate esterase (ANAE+), antibody titer, but lower (p&lt;0.05) malonaldehyde (MDA) levels and heterophil/lymphocyte ratio (H/L). There was a linear effect for T-AOC(p=0.002),...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anti-stress ability; Growth; Immune function; Light intensity; Yellow feathered broilers.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2018000100079

Photosynthetic responses to temperature and light of Antarctic and Andean populations of Colobanthus quitensis (Caryophyllaceae)
Provedor de dados: Revista Chilena de Historia Natural
Autores: SIERRA-ALMEIDA,ÁNGELA; CASANOVA-KATNY,M. ANGÉLICA; BRAVO,LEÓN A; CORCUERA,LUIS J; CAVIERES,LOHENGRIN A.
Colobanthus quitensis (Kunth, 1831) Bartling (Caryophyllaceae) is characterized by a wide latitudinal distribution, ranging between the tropical high Andes and the Antarctic Peninsula. Although both habitat types are characterized by cold and freezing temperatures, important microclimatic differences exist during the growing season. Hence, important differences in the response of the photosynthetic apparatus to abiotic factors could be expected between Antarctic and Andean populations of C. quitensis. We studied the relationship between net photosynthesis, leaf temperature and light intensity in two populations of C. quitensis, one from La Parva in the Andes of central Chile and the other from King George Island, in the Maritime Antarctic. Plants from both...
Tipo: Journal article
Palavras-chave: Photosynthesis; Colobanthus quitensis; Optimum leaf temperature; Light intensity.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2007000300007

Development and bloom in hybrids of wild passion fruit cultivated in different types of pots and shading levels
Provedor de dados: Scientia Agricola
Autores: Santos,Eileen Azevedo; Souza,Margarete Magalhães; Viana,Alexandre Pio; Almeida,Alex-Alan Furtado de; Araújo,Ioná Santos; Freitas,Jôsie Cloviane de Oliveira.
Ornamental hybrids of passion flowers are thoroughly diffused in many countries and used in the decoration of houses and gardens. However, the cultivation of ornamental passion fruits practically unexploited in Brazil. This study aimed at evaluating the growth and blooming of F1 hybrids of Passiflora L. (P. sublanceolata J.M. MacDougal [ex P. palmeri var. sublanceolata Killip] vs. P. foetida var. foetida L.) cultivated in ceramic and concrete pots under different shading levels. The vegetative and flower evaluations were carried out weekly, in clonal cuttings 60 days after rooting. The height, leaf length and width, the number of internodes and leaves and stem diameter were evaluated using a randomized complete design in a factorial scheme which...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Passion flower; Ornamental hybrids; Interspecific hybridizations; Light intensity; Morphological characteristics.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000200007

ผลของความเข้มแสงต่อการเจริญเติบโต และการสะสมการแอนโทไซยานินในใบข้าวเหนียวดำ
Provedor de dados: Thai Agricultural Research Repository
Autores: Kanyakarn Poonsiri; Kanlaya Kongngaon.
Light intensity is an important factor affected rice growth and productivity. A comparative study on the effects of light intensity were investigated in three cultivars of black glutinous rice No.19, 27 and 51. Seeds were hydroponically grown for 30 days then divided into 3 groups: grow under natural light condition (300 Klux) and under low light condition 2 levels (3 and 1 Klux) using shaded net. The effect of light intensity on four growth-stages including; seedling, tillering, heading and maturity was observed. The results showed that the low light intensity caused decrease fresh weight, dry weight and anthocyanin contents in all cultivars. Moreover, the heading stage had higher anthocyanin content than other stages. The No. 51 had the highest level of...
Tipo: PhysicalObject
Palavras-chave: Black glutinous rice; Light intensity; Anthocyanin; ข้าวเหนียวดำ; ความเข้มแสง; แอนโทไซยานิน; การเจริญเติบโต; ผลผลิต.
Ano: 2012
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5417

Combination of Black Shading Nets and Its Effect on Radiation Intensity and Quality
Provedor de dados: Agricultural Engineering International : The CIGR e-journal
Autores: dos Reis, Carlos Henrique Goulart; Pereira, Fabricio José.
The use of shading nets in agronomy is a common method to create protected environments for plant acclimation and production. Climate changes increased the use of shading nets and it is common to find builds with combined or overlapped layers whereas the resulting attenuation is unclear. This work aimed to study the radiation intensity and attenuation inside shaded environments created by combining black shading nets. Shading environments were build with a base 30% black shading net and the combinations of 30%+50% and 30%+70% nets, plus, shaded environments were compared to unshaded condition. The experimental design was completely randomized with four treatments and five replicates. Radiation intensity was measured with a spectroradiometer at ultraviolet...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Protected environment; UV-Radiation; Light intensity; Photosynthetically active radiation.
Ano: 2022
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/7375

Ground level photosynthetically active radiation dynamics in stands of Acacia mearnsii De Wild
Provedor de dados: Anais da Academia Brasileira de Ciências
Autores: PÉLLICO NETTO,SYLVIO; SANQUETTA,CARLOS R.; CARON,BRAULIO O.; BEHLING,ALEXANDRE; SIMON,AUGUSTO A.; CORTE,ANA PAULA D.; BAMBERG,ROGÉRIO.
ABSTRACTThe objective is to study the dynamics of photosynthetic radiation reaching the soil surface in stands of Acacia mearnsii De Wild and its influence on height growth in stands. This fact gives rise to the formulation of the following hypothesis for this study: "The reduction of the incidence of light inside the stand of black wattle will cause the inflection point in its height growth when this reaches 4 to 5 m in height, i.e. when the stand is between 2 and 3 years of age". The study was conducted in stands in the state of Rio Grande do Sul, Brazil, where diameters at breast height, total height and photosynthetically active radiation available at ground level were measured. The frequency tended to be more intense when the age of the stands...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Burr function; Light intensity; Probabilistic models; Temporal variation.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000401833

Effect of Light Intensity on Initial Survival of Fat Snook (Centropomus parallelus, Pisces: Centropomidae) Larvae
Provedor de dados: Brazilian Archives of Biology and Technology
Autores: Cerqueira,Vinicius Ronzani; Brügger,André Macedo.
Different light intensities were tested during the larval rearing of fat snook (Centropomus parallelus) to evaluate its influence on survival and functional swim bladder rate. Newly-hatched larvae were obtained by stripping of hormonally induced broodstock, and were stocked in 32-liter tanks at densities from 30 to 50 L-1. Four experiments were carried out testing six light intensities: 50, 100, 200, 500, 1500, and 2500 lx, and total darkness as a control. Mean survival ranged from 0.06 to 16.0% and were significantly influenced by light intensity. Complete darkness resulted in 100% mortality after one week, larvae appeared to have starved since they had empty stomachs. The species has the characteristics of a visual-feeder. Survival was the highest at 200...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fat snook; Larva; Centropomus parallelus; Light intensity; First-feeding.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132001000400004

The influence of light intensity on anatomical structure and pigment contents of Tradescantia pallida (Rose) Hunt. cv. purpurea Boom (Commelinaceae) leaves
Provedor de dados: Brazilian Archives of Biology and Technology
Autores: Paiva,Élder Antonio Sousa; Isaias,Rosy Mary dos Santos; Vale,Fernando Henrique Aguiar; Queiroz,Cristina Generosa de Senna.
The aim of this work was to study the effects of five different light intensities on the anatomical structure and on the pigment contents in leaves of Tradescantia pallida cv. purpurea. Once light intensity became lower, the thickness of leaf lamina and mesophyll were reduced. Adjustments in light-harvesting antenna size were observed: an increase in chlorophyll a + b/carotenoids ratio at low-light growth conditions. There was a strong positive linear correlation between the light intensity values and anthocyanin contents. Hence, T. pallida cv. purpurea acclimation to distinct environmental conditions might be related to its capacity of altering structurally and physiologically its phenotype.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leaf anatomy; Light intensity; Chlorophyll; Carotenoids; Anthocyanin; Tradescantia.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132003000400017

Physiological aspects of sun and shade leaves of Lithraea molleoides (Vell.) Engl. (Anacardiaceae)
Provedor de dados: Brazilian Archives of Biology and Technology
Autores: Dias,Jaqueline; Pimenta,José Antonio; Medri,Moacyr Eurípedes; Boeger,Maria Regina Torres; Freitas,Claudinei Toledo de.
The aim of this work was to compare the physiological parameters of sun and shade leaves of a specimen of L. molleoides. The higher-positional leaves, classified as sun leaves, presented similar photosynthetic rate, lower chlorophyill contents (a, b and total), same a chlorophyll /b chlrorophyll rate, lower transpiratory rate, same stomatal conductance and intercellular concentration of CO2 as the lower-positional leaves, classified as shade leaves. Nutrient concentration, except for Ca and Mg, was the same for both sun and shade leaves.The physiological parameter responses indicated that although receiving lower light intensity, the shade leaves had the same capacity to grow and develop as the sun leaves.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Photosynthesis; Sun leaves; Shade leaves; Light intensity; Chlorophyll; Lithraea molleoides.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000100011

Culture Conditions stimulating high γ-Linolenic Acid accumulation by Spirulina platensis
Provedor de dados: Brazilian Journal of Microbiology
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

Growth and content of Spirulina platensis biomass chlorophyll cultivated at different values of light intensity and temperature using different nitrogen sources
Provedor de dados: Brazilian Journal of Microbiology
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

Effects of n-propyl gallate on photosynthesis and physiological parameters in Dunaliella salina are affected by stressful conditions
Provedor de dados: Brazilian Journal of Plant Physiology
Autores: Einali,Alireza; Shariati,Mansour.
We studied the effects of n-propyl gallate, which is a plastid terminal oxidase inhibitor involved in chlororespiration, on photosynthesis and physiological parameters in Dunaliella salina grown under different salinities and under low or high irradiance using chlorophyll a fluorescence transient measurements and pigment analysis. The inhibitor up to 1 mM had an additive significant effect on the photosynthetic efficiency in the cell suspensions grown under low salinity and irradiance. However, in the presence of high n-propyl gallate concentration (4 mM), there was a negative effect on all physiological aspects. In contrast, this high concentration of the inhibitor could enhance efficiency of electron transport and growth parameters under high irradiance....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chlorophyll fluorescence; Dunaliella salina; Light intensity; Photosynthesis; Salt stress.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202012000300006

Female calling and male flight orientation and searching behaviors in Callisphyris apicicornis: evidence for a female-produced sex attractant pheromone
Provedor de dados: Ciencia e Investigación Agraria, Revista Latinoamericana en Ciencias de la Agricultura
Autores: Curkovic,Tomislav; Ferrera,Catalina.
Callisphyris apicicornis is a fruit pest of increasing concern in Chile. To aid in the identification of its sex pheromone for use in the management of this insect, "calling" (pheromone release) of females and "orientation and searching" behaviors of males to calling females were video recorded. Light intensity, wind speed, temperature, time of the day, and the frequency of individuals performing each step within both behavioral sequences were recorded as well. Drawings of the behavioral steps and ethograms (routes and returns) are also provided, including transition frequencies between behavioral steps. The calling behavior of females included diagnostic movements of the abdomen, legs, elytra, and wings, showing similarities to the descriptions of other...
Tipo: Journal article
Palavras-chave: Cerambycidae; Insect age; Light intensity; Pheromone; Sexual behavior.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000100012