. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. PRODUCTION OF V+ HORMONE BY FAT BODIES 413 larvae that had been subjected to low food conditions yielded solutions that were negative in tests for v* hormone. Fat bodies from prepupae ( hours after puparium formation) were extracted with hot Ringer's solution. This extract gave a slight but definitely positive modification of the eyes of vermilion brown test animals (11 flies, eye color ). It appears that in such larvae, as in normal wild-type larvae, the fat body produces v+ hormone subsequent to the time of p
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. PRODUCTION OF V+ HORMONE BY FAT BODIES 413 larvae that had been subjected to low food conditions yielded solutions that were negative in tests for v* hormone. Fat bodies from prepupae ( hours after puparium formation) were extracted with hot Ringer's solution. This extract gave a slight but definitely positive modification of the eyes of vermilion brown test animals (11 flies, eye color ). It appears that in such larvae, as in normal wild-type larvae, the fat body produces v+ hormone subsequent to the time of puparium formation. Preliminary studies have indicated that subjection of larvae to low food conditions brings about changes in the cytoplasmic inclusions of the fat body cells. These changes may possibly be correlated with the production of hormone by vermilion larvae which have been grown under semi-starvation conditions. Since these investigations are as yet incomplete, discussion of them will be deferred. Malpighian tubes of wild-type larvae are known to contain z/+ hor- mone and there is evidence that they produce this substance. In order to determine whether the low food level might also have an effect on these organs, Malpighian tubes from semi-starved vermilion brown (or vermilion) larvae were transplanted to normal vermilion brown test larvae. It was discovered that tubes from larvae subjected to a low food level tend to kill the hosts to which they are transplanted. Pre- sumably the tubes accumulate toxic substances under such conditions. In a preliminary series four mature recipients showed no eye color modification. In this series, however, no dissections were made to de- termine whether the implant was present. A second series in which sets of four Malpighian tubes from mature semi-starved vermilion were transplanted to vermilion brown test larvae, nine adult recipients were obtained which dissections showed to contain implanted tubes. Eight of these showed a relati
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
