Small crenulated erythrocytes appear in the circulation of Rana pipiens during metamorphosis, increase in number as metamorphosis proceeds and gradually lose their wrinkled appearance. At the end of metamorphosis the entire red cell population has been replaced by these new cells. Thyroxine induces
Anaerobiosis in a frog,Rana pipiens
โ Scribed by Rose, Francis Lewis ;Drotman, Robert Benjamin
- Publisher
- John Wiley and Sons
- Year
- 1967
- Tongue
- English
- Weight
- 424 KB
- Volume
- 166
- Category
- Article
- ISSN
- 0022-104X
No coin nor oath required. For personal study only.
โฆ Synopsis
Rana pipiens shows an obvious reduction in hepatic, ventricular, and gastrocnemius muscle glycogen concentrations with increasing time in anoxia. Pulmonary respiratory movements drop sharply during the first three minutes of anoxia and virtually cease after 30 minutes. Iodoacetate-poisoned frogs survive anoxia only 20 minutes; whereas, non-poisoned animals survive anoxia in excess of two hours. The combined evidence indicates that energy derived from anaerobic processes helps maintain physiological integrity in anurans during conditions of anoxic stress.
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This report describes the capacity of larvae of the Leopard frog, R u m pipiens, to regenerate pineal tissue after embryonic pinealectomy, and presents experimental evidence for frontal organ dependence on the epiphysis. In addition, it was found that the "brow spot," a pigment-free region located i
## ONE FIGURE Although there are several reports (Harris, '46 ; Barth, '47, '50) of phosphatase activity of preparations from frog eggs, there appears to be little known about the phosphatases in the tissues of the adult frog. Ponz ('46, '47) has recently reported the presence of glycerophosphatas
Seasonal changes in blood glucose content, liver glycogen content, and fat body weight have been studied in Rana pipiens. Over a 12-month period frogs were maintained at room temperature in tap water for a minimum of 14 days before observations were made. The frogs were not fed while in the laborato