Word: ovum
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Dates: during 1950-1959
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Brother Ronald, a student at Worcester State Teachers College, heard that a man could get along with only one kidney, and offered one of his to Richard. Satisfied that the twins were indeed identical (from a single ovum), so that there seemed to be little or no danger of hostile antibodies developing, the surgeons agreed to operate...
...Sieve's report was a little too pat, his results too nearly perfect. In the first place, Dr. Sieve conceded that in experiments with mice he had had 60% failures. Next, he relied heavily on the theory that the ability of the male sperm to penetrate an ovum depends largely on the enzyme hyaluronidase, and argued that the hesperidin must counteract this enzyme. Actually, say physiologists, there is no proof that hyaluronidase is responsible for penetration of the ovum. Further, Dr. Sieve speculated that the hesperidin helps a layer of cells around the ovum to clump together and keep...
...first hours after conception. Last week, Dr. Hertig told the International and Fourth American Congress on Obstetrics and Gynecology, meeting in Manhattan, that he had succeeded in studying the youngest human yet: he had put under the microscope a specimen which was obtained only 60 hours after the ovum had been fertilized...
...hour embryo was a double-cell group (the fertilized ovum having just begun to divide) and was found in the Fallopian tube. In other cases, embryos four to four-and-a-half days old were found in the uterus. Presumably the youngest human yet observed would have descended to the uterus within...
...Precedents. Medicine does not know for certain how joined twins are formed. Most authorities believe that the splitting of an ovum, which would form identical twins, is somehow arrested before the split is complete. Others, pointing out that Siamese twins show marked differences in height and weight, features and temperament, believe that two separate embryos from different ova may join...