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WHAT DOES PHOTOTAXIS MEAN IN ENGLISH?
Phototaxis is a kind of taxis, or locomotory movement, that occurs when a whole organism moves towards or away from stimulus of light. This is advantageous for phototrophic organisms as they can orient themselves most efficiently to receive light for photosynthesis. Phototaxis is called positive if the movement is in the direction of increasing light intensity and negative if the direction is opposite. Two types of positive phototaxis are observed in prokaryotes. The first is called scotophobotaxis, which is observed only under a microscope. This occurs when a bacterium swims by chance out of the area illuminated by the microscope. Entering darkness signals the cell to reverse flagella rotation direction and reenter the light. The second type of phototaxis is true phototaxis, which is a directed movement up a gradient to an increasing amount of light. This is analogous to positive chemotaxis except that the attractant is light rather than a chemical. Phototactic responses are observed in many organisms such as Serratia marcescens, Tetrahymena, and Euglena.
The translations of phototaxis from English to other languages presented in this section have been obtained through automatic statistical translation; where the essential translation unit is the word «phototaxis» in English.
List of principal searches undertaken by users to access our English online dictionary and most widely used expressions with the word «phototaxis».
FREQUENCY OF USE OF THE TERM «PHOTOTAXIS» OVER TIME
The graph expresses the annual evolution of the frequency of use of the word «phototaxis» during the past 500 years. Its implementation is based on analysing how often the term «phototaxis» appears in digitalised printed sources in English between the year 1500 and the present day.
Examples of use in the English literature, quotes and news about phototaxis
10 ENGLISH BOOKS RELATING TO «PHOTOTAXIS»
Discover the use of phototaxis in the following bibliographical selection. Books relating to phototaxis and brief extracts from same to provide context of its use in English literature.
Biology of Amphibians
Positive phototaxis has been demonstrated or observed in tadpoles of many
species of the genera Bu/o, Hy/a, and Rana, plus Xenopus laevis and Aga/ychnis
cal- /idryas inhabiting warm ponds (Ashby, 1969; Duellman, 1970; R. Jaeger and
William E. Duellman, 1994
Animal Models in Eye Research
22. The. Simplest. Eyes: Rhodopsin-mediated. Phototaxis. Reception. in.
Microorganisms. John. L. Spudich,. Elena. N. Spudich. Center for Membrane
Biology, Department of Biochemistry and Molecular Biology, University of Texas
Oceanography and Marine Biology, An Annual Review
minimum negative phototaxis occurred during the falling and rising phase of the
tide, respectively. Larvae of Chaoborus punctipennis also showed an
endogenous rhythm in phototaxis in which the number of animals showing a
Harold Barnes, 2003
Behavior and Its Neural Control in Gastropod Molluscs
Also. when above water. negative phototaxis causes the snail to go into rock
crevices where it can avoid the desiccating effects of direct sunlight. What
Fraenkel showed was that, when Littorina is under water and upside down, it
Ronald Chase Professor of Biology McGill University, 2002
Ecology of Cyanobacteria II: Their Diversity in Space and Time
Cyanobacteria possess essentially three different ways in which they respond to
light: phototaxis, photokinesis and photophobic response (Häder 1987a, b).
Phototaxis is a movement, which is oriented along the direction of light.
Brian A. Whitton, 2012
D.-P. Häder, M. Lebert. Abstract Phototaxis and photophobic responses in green
flagellated algae are mediated by a rhodopsin-type photoreceptor. Its
photoexcitation triggers a rapid cascade of electrical phenomena in the cell
D.-P. Häder, M. Lebert, 2001
Gravity and the Behavior of Unicellular Organisms
light light light 7.2.3 Phototaxis Phototaxis is an orientation mechanism guided by
the direction of light. Organisms may be swimming toward the light source, which
is called positive phototaxis (Fig. 7.3, left). This behavior is often found at low ...
Donat-Peter Häder, Ruth Hemmersbach, Michael Lebert, 2005
Advances in Insect Physiology
mutants (Fischbach and Reichert, 1978; Hu and Stark, 1977, 1980; Miller et al.,
1981). All three photoreceptor types in the compound eyes evoke positive
phototaxis. The sensitivity of the input from Rl-6 receptors is higher than that from
Cricket Behavior and Neurobiology
Federhen (1955) stressed the point that A domesticus is guided by negative
phototaxis in searching for resting sites. Moreover, negative pho- totaxis is
coupled with thigmotaxis in finding suitable shelter (Kieruzel 1976). In the field
many cricket ...
Franz Huber, Thomas Edwin Moore, Werner Loher, 1989
Cilia and Flagella
coverslips ' ib - - -be-ts-_:: - I' - -X - - - - - I optjcanibers Fig. 2 (A) Dual fiberoptic
light switch for reflecting laser light into the fiberoptic guides used to bring actinic
light to the phototaxis chamber. e, lighttight enclosure; sol, solenoid; fo, fiberoptic
10 NEWS ITEMS WHICH INCLUDE THE TERM «PHOTOTAXIS»
Find out what the national and international press are talking about and how the term phototaxis is used in the context of the following news items.
Why are moths attracted to light?
Phototaxis describes an organism's automatic movement away from or toward light. Cockroaches display negative phototaxis and move away ... «Columbia Daily Tribune, Jul 15»
Pyron Award lecture focuses on optogenetics as vision restoration …
“In green algae, this light-sensitive protein is responsible for phototaxis, the ability to move toward light to accomplish photosynthesis,” Abrams ... «Healio, Jul 15»
Briefs: IB student wins at Intel competition
His submission was entitled, “The Implementation of the Phototaxis Behavior of Physarum polycephalum in a Decentralized Robotics System.”. «Pensacola News Journal, Jun 15»
RCMP Help Dismantle Major Transnational Heroin Ring
Dubbed Project Phototaxis, the investigation into the major heroin trafficking and importation operation began in 2013, when it was discovered ... «KelownaNow, May 15»
Los Gatos and Saratoga: More than four dozen student scientists go …
Laila Margaret Sathe (LGHS): The Effects of LED Light on Phototaxis in Drosophila melanogaster Modified with Channelrhodopsin-2 Protein «San Jose Mercury News, Mar 15»
Why are moths fatally attracted to light?
To understand this phenomenon, you need to know about phototaxis. Phototaxis is an organism's automatic movement toward or away from ... «The Independent, Feb 15»
Image Capture: High-speed camera system uses PTV to study …
... measuring the motion of these crustaceans in water requires the use of a non-visible, 890nm near-infrared illuminator to prevent phototaxis. «Vision Systems Design, Feb 15»
Study suggests virus impacts caterpillar's phototactic response …
The researchers have concluded that the infection likely involves the virus capturing host pathways that are involved in phototaxis in the ... «Phys.Org, Dec 14»
Laser-guided sea monkeys show how zooplankton migrations may …
Because brine shrimp (Artemia salina) display phototaxis, a tendency to move towards a light source, researchers Monica Wilhelmus and John ... «Phys.Org, Sep 14»
Jessica Brown Findlay's former boyfriend speaks out about nude …
“It was a huge invasion of privacy, I feel really sorry for her,” the artist, who courted Jessica for two years, tells me at the Phototaxis Cob Gallery ... «Telegraph.co.uk, Sep 14»
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