Fluctuating Light
Mostrando 1-12 de 18 artigos, teses e dissertações.
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1. Patterns of growth, development and herbivory of Palicourea rigida are affected more by sun/shade conditions than by Cerrado phytophysiognomy
ABSTRACT Plant development is influenced by several abiotic factors, which in turn influence morphological traits and life history. We investigated whether leaf area, herbivory, toughness, fluctuating asymmetry, structural complexity and the number of inflorescences of Palicourea rigida are influenced by sun/shade conditions or by Cerrado phytophysiognomy (t
Acta Bot. Bras.. Publicado em: 2017-06
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2. Effect of Egg Weights on Hatching Results, Broiler Performance and Some Stress Parameters
ABSTRACT The present study was conducted to investigate the effect of hatching egg weight of broiler parent stocks on hatching results, chick performance, carcass characteristics, internal organ weights and some blood stress parameters. Eggs were divided into 3 egg weight groups (55.0 to 60.0 g (light), 60.1 to 65.0 g (medium) and 65.1 to 70.0 g (heavy)) for
Rev. Bras. Cienc. Avic.. Publicado em: 2017-06
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3. Leaf phenotypic variation and developmental instability in relation to different light regimes
ABSTRACT For pioneer plants, shaded habitats represent a stressful condition, where sunlight exposure is below the optimum level and so leaves expand in order to intercept a greater amount of light. We investigated changes in both phenotypic variation and stress of Bauhinia brevipes in sunny and shaded microhabitats. Leaf area was used as a measure of phenot
Acta Bot. Bras.. Publicado em: 2016-06
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4. Auroral electron precipitating energy during magnetic storms with peculiar long recovery phase features / Energia de precipitação auroral de elétrons durante tempestades magnéticas com características peculiares de longa fase de recuperação
Aurora, light emissions generated by collisions between energetic electrons and atmospheric particles, is often seen in the polar region. Although much is known about the aurora, there are still many questions unanswered. For example, it is not well known what is the source of the energetic particles or by what processes the particles are energized. Understa
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/11/2010
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5. Comportamento germinativo de espécies do gênero Stachytarpheta Vahl. (Verbenaceae) ocorrentes nos campos rupestres da Cadeia do Espinhaço em Minas Gerais
The present work studied the seed germination ecology of thirteen Stachytarpheta Vahl species, twenty-two populations and a hybrid between S. glabra Cham. and S. confertifolia Mold., occurring in the Rock Outcrops of the Espinhaço Range in its Minas Gerais state portion, in Brazil. Were evaluated biometrics, light and temperature influences, in addition to
Publicado em: 2008
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6. Morphometric analysis of Triatoma dimidiata populations (Reduviidae:Triatominae) from Mexico and Northern Guatemala
Triatoma dimidiata is one of the major vectors of Chagas disease in Latin America. Its range includes Mexico, all countries of Central America, Colombia, and Ecuador. In light of recent genetic analysis suggesting that the possible origin of this species is the Yucatan peninsula, we have analyzed populations from the state of Yucatan, San Luis Potosi, and Ve
Memórias do Instituto Oswaldo Cruz. Publicado em: 2005-08
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7. Dissipative and fluctuating dynamical description of nuclear reactions
We address the description of nuclear dynamics at intermediate energies within the DYWAN model. New fluctuation-dissipation aspects are discussed and confronted with experimental results in nucleus-nucleus and in nucleon-nucleus reactions. We show that the implemented treatment of fluctuations provides with a convenient tool to investigate the main character
Brazilian Journal of Physics. Publicado em: 2004-09
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8. Modelling lucerne (Medicago sativa L.) crop response to light regimes in an agroforestry system
The general goal of this research was to understand the agronomic and physiological changes of a lucerne crop in distinct physical radiation environments and to verify the potential of lucerne to grow under shaded conditions. To achieve this, the research was conducted in four main steps: (i) firstly, experimental data collection in the field using two artif
Publicado em: 2002
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9. Algae displaying the diadinoxanthin cycle also possess the violaxanthin cycle
According to general agreement, all photosynthetic organisms using xanthophyll cycling for photoprotection contain either the violaxanthin (Vx) cycle or the diadinoxanthin (Ddx) cycle instead. Here, we report the temporal accumulation of substantial amounts of pigments of the Vx cycle under prolonged high-light stress in several microalgae thought to possess
The National Academy of Sciences.
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10. Sorting single molecules: application to diagnostics and evolutionary biotechnology.
A method is described that provides for detection and identification of single molecules in solution. The method is based on fluorescence correlation spectroscopy, which records spatio-temporal correlations among fluctuating light signals, coupled with devices for trapping single molecules in an electric field. This technique is applied to studies of molecul
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11. Dependence of the Extent and Direction of Average Stomatal Response in Zea mays L. and Phaseolus vulgaris L. on the Frequency of Fluctuations in Environmental Stimuli.
Stomatal responses to fluctuating light and CO2 were investigated in Zea mays and Phaseolus vulgaris. Slow-moving stomata can affect carbon gain and water loss by plants during light flecks, under dynamic cloud cover, during alternating windy and calm air conditions (which influence CO2 concentrations and humidity immediately around leaves in plant canopies)
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12. Ecological Consequences of Long-Term Exposure of Anabaena variabilis (Cyanophyceae) to Shifts in Environmental Factors
Cultures of Anabaena variabilis were exposed to different light intensities, and the time course of photoadaptation was measured by photosynthetic rate and changes in pigmentation. A shift down in intensity of 284 μEin · m−2 · sec−1 caused a temporary decrease in the photosynthetic response followed by gradual adaptation to the new conditions. Final c