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Growth of protozoa in pure culture. III. Effect of temperature upon the division rate

✍ Scribed by Phelps, Austin

Publisher
John Wiley and Sons
Year
1946
Tongue
English
Weight
615 KB
Volume
102
Category
Article
ISSN
0022-104X

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✦ Synopsis

Though one of the most obvious methods for studying the effect of temperature upon the rate of growth of animal cells would seem to be by a n analysis of the division rate of protozoa, the work which lias been done on the problem has been meager, and the results contradictory. Woodruff and Baitsell ('11) observed tlie division rate of Paramecium at four temperatures between 16" and 28" and obtained values of Ql0 which varied from 3.13 to 2.63. Mitchell ( '29) reexamined the question, and found that if the change of division rate of Paramecium with temperature mere stated in terms of the van't Hoff-Arrhenins equation, the value of p would eqnal 33,000 between 12" and 35". If the results of the latter work a r e interpreted in the terms used by Woodruff and Baitsell the average QIn found by Mitchell is 3.6, a figure which is at variance with that found by Woodruff and Baitsell. A more extensive surrey of the literature dealing with the effect of temperature on other physiological activities of the protozoa shows the same lack of consistency. To take a few examples: Glazer ( '24), observing the forward movement of Paramecium, found p equal to 16,000 between 6" and 15", and to 8,000 between 16" and 40" (&," of approximatel:-2.7 and 1.6 respectively). Pantiri ('24) showed that tlie movement of marine amoebae displayed the following values for Qlo over th6 indicated temperature ranges : 0"-5", 16.9; 5"-1O0, 3.19; 10"-15", This work was assisted by n gmnt froin the Researc.11 Institute of tlie Unirersity of Texas.

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