نتایج جستجو برای: daylength
تعداد نتایج: 507 فیلتر نتایج به سال:
A cycloheximide-sensitive increase in the activity of phenylalanine ammonia-lyase (EC 4.3.1.5) occurs in Xanthium leaf disks exposed to light. Radioactive ammonia-lyase has been isolated by means of sucrose density gradient centrifugation and starch gel electrophoresis from disks fed l-isoleucine-U-(14)C or l-arginine-U-(14)C. The incorporation of radioactive amino acids into phenylalanine ammo...
Effect of daylength on the rate of recovery of photosensitivity in male starlings (Sturnus vulgaris)
Industrial hemp ( Cannabis sativa ) cultivars used for flower, fiber, or seed production are usually considered short-day plants and flower in response to photoperiod. However, some of day-neutral, where induction may be independent daylength. Day-neutral were planted before recommended dates studied field experiments conducted Watkinsville, GA, Spring 2020 2021. (Pipeline Maverick) photoperiod...
Temperature and photoperiod can be used to simulate soybean (Glycine max [L.] Merr) phenology because they serve as surrogates for complex biochemical pathways leading to the appearance of certain developmental stages at the whole plant level. We developed a soybean phenology model (SOYDEV) which utilizes non-linear temperature and photoperiod functions and separates floral induction and post-i...
The pineal hormone melatonin is secreted with a marked circadian rhythm. Normally, maximum production occurs during the dark phase of the day and the duration of secretion reflects the duration of the night. The changing profile of secretion as a function of daylength conveys photoperiodic information for the organization of seasonal rhythms in mammals. The role of melatonin in mammalian circad...
The hypothalamic photoreceptors regulating seasonal reproduction in birds: A prime role for VA opsin
Extraretinal photoreceptors located within the medio-basal hypothalamus regulate the photoperiodic control of seasonal reproduction in birds. An action spectrum for this response describes an opsin photopigment with a λmax of ∼ 492 nm. Beyond this however, the specific identity of the photopigment remains unresolved. Several candidates have emerged including rod-opsin; melanopsin (OPN4); neurop...
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