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Taxis |
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taxis (tăk`sĭs), movement of animals either toward or away from a stimulus, such as light (phototaxis), heat (thermotaxis), chemicals (chemotaxis), gravity (geotaxis), and touch (thigmotaxis). The turning movements of plants in response to stimuli are called tropisms tropism (trōp`ĭzəm) ..... Click the link for more information. . Taxis A mechanism of orientation by means of which an animal moves in a direction related to a source of stimulation. There exists a widely accepted terminology in which the nature of the stimulus is indicated by a prefix such as phototaxis (light), chemotaxis (chemical compounds), geotaxis (gravity), thigmotaxis (contact), rheotaxis (water current), and anemotaxis (air current). The directions toward or away from the stimulus are expressed as positive or negative, respectively. Finally, the sensory and locomotory mechanisms by means of which the orientation is achieved are denoted by a second type of prefix forming a compound noun with taxis. Positive phototropotaxis thus describes a mechanism by means of which an animal carries out a directed movement toward a source of light along a path which permits the animal's paired eyes to receive equal intensities of light throughout the movement.
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However, although only launched in 2002, the TXII was already beginning to show signs of age in the clean city environment that is nowadays so high on the political agenda, leading to its manufacturers, LTI (London Taxis International) Vehicles, the UK's largest indigenous vehicle manufacturer, to develop a new model. Taxis are equipped with LCD monitors which come with an internal speaker and are placed on the head rest of the passenger seat. Taxis always seem to be lined up at the hotels, though. |
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