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Word: chromatin (lookup in dictionary) (lookup stats)
Dates: during 1940-1949
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Usage:

Harvey reasoned that since female-producing sperm seems to contain slightly more chromatin (chromosome material), it must be slightly heavier. The problem, therefore, is to separate "biological isotopes." Harvey, citing a centrifuge method which has separated the light and heavy parts of sea urchins' eggs, thinks it can be done. His proposal: use a special centrifuge to whirl the sperm; the lighter male-producing sperm will rise to the top, can be skimmed off and planted by artificial insemination...

Author: /time Magazine | Title: Science: Sex by Centrifuge | 7/29/1946 | See Source »

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