. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ARTHROPOD MUSCLE 429 plasmic clot. A series of experiments was performed in which muscle fibers of the grasshopper (S. americana) were cut in a K-oxalate ( M)-Ca-free insect Ringer solution and allowed to remain in this solution for 15 minutes. During this period, no protoplasmic clot could be observed in these fibers (see bottom curve, Fig. 3). However, after the 15-minute period had expired, each muscle fiber was placed in normal insect Ringer. There was an immediate clotting of the muscle protoplasm. The rate of move
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ARTHROPOD MUSCLE 429 plasmic clot. A series of experiments was performed in which muscle fibers of the grasshopper (S. americana) were cut in a K-oxalate ( M)-Ca-free insect Ringer solution and allowed to remain in this solution for 15 minutes. During this period, no protoplasmic clot could be observed in these fibers (see bottom curve, Fig. 3). However, after the 15-minute period had expired, each muscle fiber was placed in normal insect Ringer. There was an immediate clotting of the muscle protoplasm. The rate of movement of this protoplasmic clot was during the first minute and at the end of 5 minutes (average of 5. 8 l6 12 14 TIME-MINUTES 16 18 20 FIGURE 3. The effects of oxalate on protoplasmic clotting in single muscle fibers of the grasshopper (Schistocerca americana}. Legend: Open circles (O), Ringer for one minute, K-oxalate ( M) for the next 4 minutes, Ringer for 5 minutes, average of 6 fibers; triangles (A), control, Ringer for 10 minutes, average of 5 fibers; squares (•), K-oxalate ( M) for 15 minutes, Ringer for 5 minutes, average of 5 fibers. fibers). These experiments clearly demonstrate the inhibitory effect of K-oxalate on the movement of the clot in muscle protoplasm. The effectiveness of both po- tassium and sodium oxalate is shown in Table III. Another experiment was performed to determine whether this clotting reaction, once initiated by calcium, could be stopped. In this experiment a muscle fiber was first exposed to normal insect Ringer (containing calcium as the clotting agent) for a period of time sufficient to initiate the clotting reaction. Then the fiber was washed and the Ringer solution replaced with an oxalate-Ringer solution. After observations were made on the progress of the clot, the oxalate-Ringer solution was replaced with normal insect Ringer and the rate of clotting was again observed. The results of this experim
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
