منابع مشابه
Prospects dim for I . C . job hunters
Friday is the target date for deciding whether to exchange the space now occupied by the Union Bookstore wi th that of the Office of Student Activities. Union administrators, student government representatives and the manager of the bookstore met Monday to iron out the reallocation plan details. ifut student government leaders stressed after the meeting that the decision to move has not been fi...
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...
متن کاملDuration Distributions of Bright and Dim Batse Gamma-ray Bursts
We have measured the T90 and T50 durations of bright and dim gamma-ray bursts (GRBs) detected by the Compton Gamma Ray Observatory’s Burst and Transient Source Experiment (BATSE). The T90 (T50) duration is defined as the interval over which 5% (25%) to 95% (75%) of the burst counts accumulate. Out of 775 bursts observed by BATSE, 159 bursts were analyzed; bursts with durations shorter than 1.5 ...
متن کاملDetection of bright and dim colours by honeybees.
Honeybees, Apis mellifera, were trained to detect coloured disks with either a strong or a weak intensity difference against the background. Green, blue, ultraviolet-reflecting white and grey papers were reciprocally combined as targets or backgrounds, providing strong chromatic and/or achromatic cues. The behavioural performance of the honeybees was always symmetrical for both reciprocal targe...
متن کاملSingle molecule flips between dim and bright states
Satoshi Habuchi et al. have characterized a reversible photoswitching system that uses individual molecules of Dronpa, a mutant of GFP cloned from the coral Pectiniidae. The authors showed that a single Dronpa molecule can flip between bright and dim states when exposed to light wavelengths of 405 and 488 nm, respectively. Dronpa can switch back and forth 100 times on a millisecond time scale. ...
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ژورنال
عنوان ژورنال: Nature
سال: 1987
ISSN: 0028-0836,1476-4687
DOI: 10.1038/330105a0