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Word: jahn (lookup in dictionary) (lookup stats)
Dates: during 1942-1942
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Usage:

...species of plants, one of these animals-Euglena rubra by name-changes its color, now red, now green, to control the amount of light it uses. This phenomenon was explained last week in Physiological Zoology by Leland P. Johnson of Drake University and Theodore Louis Jahn of the University of Iowa...

Author: /time Magazine | Title: Science: Euglena Muscles In | 1/26/1942 | See Source »

Zoologists Johnson and Jahn studied these microscopic protozoa in Iowa ponds for five summers, found they were reddest when the temperature was a sunny 90° or more. Taken to a dark laboratory, the animals turned green, then turned red again not only on exposure to light but to heat. Reason: migration of a red pigment between the animal's interior and its surfaces. Its purpose: to protect the chlorophyll granules from an overload of light, which would destroy the pigment. Besides making food like plants, Euglenae also can eat like animals...

Author: /time Magazine | Title: Science: Euglena Muscles In | 1/26/1942 | See Source »

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