منابع مشابه
surgical treatment of severely traumatized eyes with no light perception
purpose: to evaluate the anatomical and functional outcomes of surgical treantment in severely traumatized eyes with no light perception (nlp) vision. methods: in this prospective interventional case series, 18 eyes of 18 patients with severe trauma and nlp vision and rapd of 3-4+ admitted in nikookari hospital, tabriz-iran during 2002-2005 underwent deep vitrectomy and other appropriate proced...
متن کاملLight perception and signalling by phytochrome A.
In etiolated seedlings, phytochrome A (phyA) mediates very-low-fluence responses (VLFRs), which initiate de-etiolation at the interphase between the soil and above-ground environments, and high-irradiance responses (HIR), which complete de-etiolation under dense canopies and require more sustained activation with far-red light. Light-activated phyA is transported to the nucleus by FAR-RED ELONG...
متن کاملMotion perception at scotopic light levels.
Although the spatial and temporal properties of rod-mediated vision have been extensively characterized, little is known about scotopic motion perception. To provide such information, we determined thresholds for the detection and identification of the direction of motion of sinusoidal grating patches moving at speeds from 1 to 32 deg/s, under scotopic light levels, in four different types of o...
متن کاملLight perception and signalling in higher plants.
Plants monitor changes in the ambient light environment using sensory photoreceptor families: the phototropins and cryptochromes, which absorb UV-A or blue light; the phytochromes, which sense red/far-red light; and the UV-B photoreceptors, which have not yet been identified. Recent advances suggest that photoreceptor-induced signalling cascades regulate light-modulated gene expression. These r...
متن کاملLight Perception: More Than Meets the Eyes
Larval zebrafish lacking eyes and pineal organ show elevated activity levels and undirected light-seeking behaviour upon loss of illumination. This behaviour, termed dark photokinesis, is mediated by hypothalamic deep brain photoreceptors expressing melanopsin.
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ژورنال
عنوان ژورنال: Botanical Gazette
سال: 1911
ISSN: 0006-8071
DOI: 10.1086/330522