Word: spermatozoa
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...laboratory Dr. Perry induced unseasonable sex activity by shining ordinary 25-watt lamps on sparrows much less than a year old. The beaks of the males turned dark and their testes developed spermatozoa; the ovaries of the females were swollen, contained numerous eggs. The scientist evoked even more pronounced gland changes with ultraviolet light...
...great discoveries of modern genetics is that certain hereditary characters are linked to the sex factor. Males manufacture two kinds of spermatozoa, one bearing a y-chromosome, the other an x-chromosome. If a y-chromosome spermatozoon happens to penetrate the female ovum, the get is a boy; if an x-chromosome, it is a girl. Thus Professor Crew reasoned the shorter life expectancy of the male seems to be carried on a gene or genes in the y-chromosome. By delicate manipulations, geneticists have had some success in separating male and female elements in mammalian sperm, opening the prospect...
...contraceptive is a synthetic, hormone-like substance to be administered hypodermically. It inhibits the production of ova, without which no woman can conceive. In this respect it differs from spermatoxin, an extract of spermatozoa, which renders a woman transiently infertile when injected into her arm like a vaccine. As long as her blood is stimulated by spermatoxin no spermatozoa can affect her and she cannot have babies. Not all women will endure injections of spermatoxin, because it may render them allergic and put them in a class with victims of hives...
...Graves turned the problem of preserving the vitality of the sperm during shipment over to his crack veterinarian, Dr. Fred W. Miller. From the bulls Dr. Miller extracted semen containing 1,000,000,000 spermatozoa, mixed the fluid with an equal amount of sugar solution, chilled the tubes to 34° F. (spermatozoa kept in warm temperatures lash their tails until they get tired, die). Next he buried the tubes in diatomaceous earth, a good insulator, packaged the whole in a buttermilk container...
...results of preventing the emission of spermatozoa, of leaving to the testes the duty of producing only the male sex hormones, have been extremely satisfying, as in the case of Dr. Lorenz. The Steinach operation is performed, however, on young men-the potential fathers, heads of families-with great reluctance. In some cases-from sexual excesses, from overwork, from disease-spermatozoa production has fallen off or ceased entirely. In "older" men, usually in those who have reached their sixties, similar falling off or cessation occurs. For such the operation is beneficial. They will pep up, with all the connotations this...