 495  137,000 miles for the orbital radius of a stationary satellite given ,y your correspondent. This, however, is still as high as 88 times he radius of the planet, and my conclusion that it would be too far out to be of practical value for communication purposes still holds. 165. Although the values for total lipid are of limited accuracy, they nevertheless tend to indicate that esterified cholesterol and phospholipid probably are the only lipids present in significant concentration among the low density products. A small amount of lipid unaccounted for in the low density products from the human serum may represent released triglyceride. 166. Our age is often called the age of specialization. It might be more aptly called the age of ultra-specialization, for it is no longer sufficient for the scientist to specialize in one science, such as geology, metallurgy, chemistry, and so on. Even within this limited sphere of technical knowledge he must choose a narrow path if he is to reach its limit. 167. Additional studies on the sites of RNA synthesis in NDV-infected cells were carried out with tritiated cytidine. The experimental procedures used were identical with those just described, with one exception: following fixation, cells were digested with DNAase, 30° g per ml of PBS, for 1 hour at 37° C. The cells were then refixed in acetic alcohol, dried, and processed for autoradio-graphs. 168. As in any endocrine disease, the diagnosis should be confirmed by proof that the gland is secreting aldosterone in excess. For this purpose the best method to date consists of measuring secretory rates by estimating dilution of radioactive aldosterone in body fluids. However, the method is not readily available. In contrast, urinary excretion of aldosterone and its metabolites may be determined by a number of practical techniques. 169. Although humoral hemostatic defects may appear from time to time after acute hemolytic reactions involving canine anti-A, it is apparent that the physiologically most significant and consistent abnormality is that due to thrombocytopenia. Such a reaction, occurring at the time of experimental surgery can lead to a marked increase in blood loss, and at times, loss of animals. 495 |
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