HOW ALGAE RESPOND TO DIM AND BRIGHT LIGHT
نویسندگان
چکیده
منابع مشابه
Heterotrophic growth of blue-gren algae in dim light.
A unicellular blue-green alga, Agmenellum quadruplicatum, and a filamentous blue-green alga, Lyngbya lagerheimíi, were grown heterotrophically in dim light with glucose as major source of carbon and possibly energy. The dim-light conditions did not support autotrophic growth. The two blue-green algae appeared to have the same metabolic block, namely an incomplete tricarboxylic acid cycle, as ha...
متن کاملEvening melatonin and bright light administration induce additive phase shifts in dim light melatonin onset.
In healthy young men, administration of a single light pulse (5000 lux for 3 hr) or a single melatonin pill (5 mg) at 20:40 hr under controlled constant routine conditions of <10 lux, yielded a phase delay and a phase advance, respectively, in the circadian marker of dim light melatonin onset 24 hr later. Phase shifts after combining the two interventions were additive. Melatonin suppression is...
متن کاملTransition from dim to bright light in the morning induces an immediate elevation of cortisol levels.
The only well documented effect of light exposure on endocrine function is the suppression of nocturnal melatonin. Bright light exposure has behavioral effects, including the alleviation of sleepiness during nocturnal sleep deprivation. The present study examines the effects of bright light on the profiles of hormones known to be affected by sleep deprivation (TSH) or involved in behavioral act...
متن کاملSleep deprivation in bright and dim light: antidepressant effects on major depressive disorder.
Twenty-three patients with a major depressive disorder were deprived of a night's sleep twice weekly, one week staying up in the dimly lit living room of the ward (less than 60 lux), and one week in a brightly lit room (greater than 2000 lux). Immediate, but transient beneficial effects of sleep deprivation were observed primarily in eight patients (the 'responders'). The immediate effects did ...
متن کاملCircadian phase-shifting effects of a laboratory environment: a clinical trial with bright and dim light
BACKGROUND Our aims were to examine the influence of different bright light schedules on mood, sleep, and circadian organization in older adults (n = 60, ages 60-79 years) with insomnia and/or depression, contrasting with responses of young, healthy controls (n = 30, ages 20-40 years). METHODS Volunteers were assessed for one week in their home environments. Urine was collected over two 24-ho...
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ژورنال
عنوان ژورنال: Journal of Experimental Biology
سال: 2011
ISSN: 1477-9145,0022-0949
DOI: 10.1242/jeb.061317