phototaxis


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phototaxis

 [fo″to-tak´sis]
taxis of cells and microorganisms under the influence of light. adj., adj phototac´tic.

pho·to·tax·is

(fō'tō-tak'sis),
Reaction of living protoplasm to the stimulus of light, involving bodily motion of the whole organism toward (positive phototaxis) or away from (negative phototaxis) the stimulus. Compare: phototropism.
[photo- + G. taxis, orderly arrangement]

phototaxis

/pho·to·tax·is/ (-tak´sis) the movement of cells and microorganisms in response to light.phototac´tic

phototaxis

(fō′tō-tăk′sĭs)
n.
The movement of an organism or a cell toward or away from a source of light.

pho′to·tac′tic (-tăk′tĭk) adj.
pho′to·tac′ti·cal·ly adv.

pho·to·tax·is

(fō'tō-tak'sis)
Reaction of living protoplasm to the stimulus of light, involving bodily motion of the whole organism toward (positive phototaxis) or away from (negative phototaxis) the stimulus.
Compare: phototropism
[photo- + G. taxis, orderly arrangement]

phototaxis

the movement of a whole organism in response to a directional light stimulus. For example, movement of unicellular algae or fruit flies towards a source of light is positive phototaxis, while movement away from light if the stimulus is too strong is negative phototaxis.

phototaxis

the movement of cells and microorganisms under the influence of light.
References in periodicals archive ?
imbecillis that had completed their parasitic phase with chironomids (what I referred to as post-chironomid larvae) exhibited negative phototaxis only in the presence of water that had been modified by U.
For a long time, nobody knew how the animals do phototaxis with their simple eyes and nervous system," explained Detlev Arendt, whose team carried out the research at EMBL (European Molecular Biology Laboratory).
In our study, quantitative methods for measuring age-related declines in phototaxis and geotnxis are presented along with recommendations relating to adult immobilization, recovery times, photoperiod, and culture conditions.
Flies stayed at the top because of positive phototaxis and negative geotaxis until they succumbed to heat and rolled down a series of baffles reaching a collecting vial.
However, this reversal of its phototaxis will only occur when the snail is underwater.
In calm weather most are in the upper 5 m because of positive phototaxis (Barile et al.
I want to know if there is enough light of the proper wavelengths for the organisms to use, either for vision, for photosynthesis, or for phototaxis [movement toward or away from light].
Alternatively, some ascidian larvae exhibit positive phototaxis upon release, then reverse direction away from light.
A sensitive and convenient method was developed for measuring phototaxis of algal cells using a Gilford Response UV-VIS Spectrophotometer with attached printer.
Fish attraction light pattern, the original design of the NCKU research team, employed biological phototaxis, LED underwater transfer model and energy mapping may be the first attempt in the world to apply the concept of illumination pattern to fishing lights, according to Fang.