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Behaviour of Micro-organisms: Based on the Proceedings of by A. Perez-Miravete

By A. Perez-Miravete

Organisms are continuously being bombarded by way of stimuli of their envi­ ronment (and additionally by means of inner stimuli), and a typical approach of responding is via stream. this can be a side of irritability, or excitability, or behaviour. reaction to stimuli through flow is located in all organisms: it represents one of many universalities of biology. but on the molecular point it really is one of many least understood of organic phenomena. Micro-organisms aren't any exception. If motile, they reply to stimuli by means of energetic stream (taxis); if sessile, they reply through development pursuits (tropisms). Responses by means of circulate are identified between micro-organisms to such stimuli as chemical compounds, electrical present, gravity, gentle, temperature, contact, and vibrations. The behaviour of micro-organisms is a thrilling topic, firstly for its personal sake, but also since it may possibly demonstrate proof and ideas which are acceptable to figuring out behaviour in additional advanced organisms (even us) and since it could actually, aid to appreciate the circulate of cells and tissues in the course of differentiation and improvement of upper crops and animals.

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However, many authors, even recently (Dryl 1961 a, Rosen 1962, Jahn and Bovee 1968, Dryl and Grebecki 1966), still use the traditional term "chemotaxis" to describe the non-directed movements of protozoa towards external chemical stimuli. 2. Mechanism of Chemotaxis Depending upon the speCies of animals under study, the normal progressive locomotion of the ciliate protozoa is based on the action of various locomotor CHEMOTAXI S Il\' CILlAT L 1 J' ; UTOZOA ,v Figure 3. 8. A number of avoiding reactions visible on the boundary between two solutions.

1959 a). Acta BioI. expo 19, 53. , S. (1959 b). Acta BioI. expo 19, 95. Dryl. S. (1961 a). Acta BioI. expo 21, 75. Dryl. S. (1961 b). Bull. Acad. pol. Sci. CI. II~. 71. Dryl, S. (1961 c). J. Protozool. ) Abstr. 55. Dryl. s. (1963). Anim. Behav. g. 393Dryl. s. (1965). Progress in Protozoal.. London Abstr. 308. Dryl. s. (1969). Motor response of Protozoa to external stimuli. Progress in Protozoology, 124-126. Publishing House "Nauka- Leningrad. Dryl, S. (1970). Acta Protozool. 2. 325. CIIE ~lOTAXJS 11\ CILIATE PROTOZOA 29 Dryl, S.

Amer. Assoc. Adv. Sci .. C. Grundfest, H. (1964). Evolution of electrophysiological varieties among sensory receptor systems. Essays on Physiological Evolution. Pergamonn Press. Oxford-London-Edinburgh-New York - Paris - Frankfurt. Gunn, D. • Kennedy. J. S.. and Pie lou , D. P. (1937). Nature 140, 1064. Horton, F. M. (1935). J. Exp. BioI. 12, 13. Jahn, T. (1961). J. Protozool. §.. 369. Jahn. (1962). J. Cell. Compo Physio1. 60, 217. Jahn, T. L. and Bovee, E. C. (1968). Mtile Behavior of Protozoa.

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