Results 261 to 270 of about 109,508 (308)
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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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Photoperiodicity in the Female Ferret
Journal of Experimental Biology, 1951ABSTRACT Evidence accumulated during two years’ work and experience in photoperiodicity in ferrets suggests the following conclusions: Oestrus or anoestrus may be induced by influencing the activity of the pituitary gland; this is effected through a contrast-sensitive mechanism which is stimulated by light:dark sequences ...
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Photoperiod insensitivity in crops
Journal of Experimental BotanyAbstract Photoperiod, the length of daylight within a 24 hour cycle, serves as the most consistent signal for seasonal changes. Plants have developed mechanisms to adapt to these cycles, displaying well-established photoperiodic responses in traits such as flowering time.
Alberto González-Delgado +2 more
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Time Measurement in Insect Photoperiodism: Reversal of a Photoperiodic Effect by Chilling
Science, 1967Spectacular reversals of the photoperiodic control of diapause are obtained if females of Nasonia vitripennis are chilled for 4 hours in certain light-dark cycles. Experiments in which chilling is combined with short light breaks (night interruptions) show that the first peak of diapause inhibition moves in response
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PHOTOPERIODISM IN AMARANTHUS CAUDATUS. I. A RE‐EXAMINATION OF THE PHOTOPERIODIC RESPONSE
American Journal of Botany, 1961Zabka, George G. (State U. Iowa, Iowa City.) Photoperiodism in Amaranthus caudatus. I. A re‐examination of the photoperiodic response. Amer. Jour. Bot. 48(1): 21–28. Illus. 1961.—Under the conditions described in this study, Amaranthus caudatus is not subject to inductive short days until it has reached its “sensitive period” or age which is ...
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