Results 351 to 360 of about 230,941 (392)
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Photorefractoriness in birds—photoperiodic and non-photoperiodic control
General and Comparative Endocrinology, 2007Avian breeding seasons vary in length and in the degree of asymmetry with respect to the annual cycle in photoperiod to suit species-specific food resources. Asymmetry is the result of photorefractoriness. The degree of photorefractoriness, absolute or relative, is related to the length and asymmetry of the breeding season. Absolute photorefractoriness
Dawson, Alistair, Sharp, Peter, J.
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The Journal of the Science of Food and Agriculture, 2019
BACKGROUND Understanding plant responses to light quantity in indoor horticultural systems is important for optimising lettuce growth and metabolism as well as energy utilisation efficiency.
A. Viršilė +6 more
semanticscholar +1 more source
BACKGROUND Understanding plant responses to light quantity in indoor horticultural systems is important for optimising lettuce growth and metabolism as well as energy utilisation efficiency.
A. Viršilė +6 more
semanticscholar +1 more source
Photoperiodism in Neurospora Crassa
Journal of Biological Rhythms, 2004Plants and animals use day or night length for seasonal control of reproduction and other biological functions. Overwhelming evidence suggests that this photoperiodic mechanism relies on a functional circadian system. Recent progress has defined how flowering time in plants is regulated by photoperiodic control of output pathways, but the underlying ...
Ying Tan, Martha Merrow, Till Roenneberg
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Critical Photoperiod Measurement of Soybean Genotypes in Different Maturity Groups
Crop science, 2019Soybean [Glycine max (L.) Merr.] is a photoperiod-sensitive crop, and the photoperiod response determines the ecological adaptability of soybean genotypes.
Wenying Yang +9 more
semanticscholar +1 more source
Ciba Foundation symposium, 1985
Birds show a circadian rhythm in melatonin secretion and, as expected, the pattern of output changes with photoperiod. Somewhat surprisingly then, in view of the mechanisms in mammals, birds do not seem to use this seasonal message in the photoperiodic control of reproduction.
Russell G. Foster +2 more
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Birds show a circadian rhythm in melatonin secretion and, as expected, the pattern of output changes with photoperiod. Somewhat surprisingly then, in view of the mechanisms in mammals, birds do not seem to use this seasonal message in the photoperiodic control of reproduction.
Russell G. Foster +2 more
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Are Humans Seasonally Photoperiodic?
Journal of Biological Rhythms, 2004Humans exhibit seasonal variation in a wide variety of behavioral and physiological processes, and numerous investigators have suggested that this might be because we are sensitive to seasonal variation in day length. The evidence supporting this hypothesis is inconsistent. A new hypothesis is offered here—namely, that some humans indeed are seasonally
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Photomorphogenesis and Photoperiodism in Plants
2007Plants depend on light as their main source of energy. However, light is also an important source of information for plants, and changes in the nature of the light reaching a plant can signal seasonal change, potential and actual competition by shading, proximity to the soil surface of roots and seeds, and potential photodamage.
Weller, James L., Kendrick, Richard E.
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Genetic variation in photoperiodism among naturally photoperiodic rat strains
American Journal of Physiology-Regulatory, Integrative and Comparative Physiology, 2001Rattus norvegicus has been considered nonphotoperiodic, but Fischer 344 (F344) rats are inhibited in growth and reproductive development by short photoperiod (SD). We tested photoresponsiveness of the genetically divergent Brown Norway (BN) strain of rats.
M. Benjamin Shoemaker +2 more
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Photoperiodism in quail: testicular growth and maintenance under skeleton photoperiods
Journal of Endocrinology, 1982Testicular growth was induced in quail which were exposed to a skeleton photoperiod that included a pulse of light given during the dark period (night-interruption). The minimum duration of the pulse inducing testicular growth was 3·75 min per day. Longer pulses induced greater rates of growth, and of LH and FSH secretion; maximum rates occurred with a
B. K. Follett, J. J. Milette
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Archiv für Meteorologie, Geophysik und Bioklimatologie Serie B, 1970
Many annual biological cycles are thought to be synchronized by seasonal patterns of day length. But day length, or day length changes,per se, do not explain the latitudinal variations of observed cycles in a consistent manner. A standardization of day length with latitude, based on the extreme photoperiods at each latitude, yields a “relative day ...
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Many annual biological cycles are thought to be synchronized by seasonal patterns of day length. But day length, or day length changes,per se, do not explain the latitudinal variations of observed cycles in a consistent manner. A standardization of day length with latitude, based on the extreme photoperiods at each latitude, yields a “relative day ...
openaire +2 more sources