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. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. RED CHROMATOPHORES OF CRAYFISHES 323 suggests that the titers of chromatophorotropins in the blood at the time of injection are important or else when the extracts are injected materials are secreted to an- tagonize the added hormones. Influence of time and temperature upon chromatophorotropins of dwarf crayfish This experiment was designed to determine the effects of boiling and mainte- nance at room temperature upon the titers of RPCH and RPDH in the supraesopha- geal ganglia with the circumesophageal connectives attached

. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. RED CHROMATOPHORES OF CRAYFISHES 323 suggests that the titers of chromatophorotropins in the blood at the time of injection are important or else when the extracts are injected materials are secreted to an- tagonize the added hormones. Influence of time and temperature upon chromatophorotropins of dwarf crayfish This experiment was designed to determine the effects of boiling and mainte- nance at room temperature upon the titers of RPCH and RPDH in the supraesopha- geal ganglia with the circumesophageal connectives attached  Stock Photo
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. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. RED CHROMATOPHORES OF CRAYFISHES 323 suggests that the titers of chromatophorotropins in the blood at the time of injection are important or else when the extracts are injected materials are secreted to an- tagonize the added hormones. Influence of time and temperature upon chromatophorotropins of dwarf crayfish This experiment was designed to determine the effects of boiling and mainte- nance at room temperature upon the titers of RPCH and RPDH in the supraesopha- geal ganglia with the circumesophageal connectives attached of dwarf crayfish. Twenty organs were removed and extracted in 1.2 ml. Van Harreveld's solution. The extract was then divided into two equal portions. One fraction was placed in 5 -. 2 0 HOURS FIGURE 4. Responses of the red chromatophores of one-eyed Cambarellus on white (A) and on black (B) backgrounds to boiled (dots) and unboiled (circles) portions of the same extract of supraesophageal ganglia, with the circumesophageal connectives attached, of Camba- rellus injected immediately after preparation. Half-filled circles, control. boiling water for 30 seconds and cooled to room temperature. The boiled and un- boiled extracts were then assayed on specimens in black and in white pans. The extracts were kept in the syringes on a table top at room temperature for 120 min- utes and then assayed again. The results are presented in Figures 4 (zero time injection) and 5 (120 minute injection). Boiling appeared to activate an inactive form of RPDH but had little, if any, effect on RPCH. Even more striking differences were apparent between the responses of the crayfish to boiled and unboiled extracts kept for 120 minutes at room temperature. The responses of the crayfish injected with the unboiled aged extract were the same as those observed by Fingerman and Lowe (1957b). The amount of RPCH had decreased considerably and the amount of RPDH had in- creased. In contrast, RPDH in the boiled