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Meisner, J., Department of Toxicology, The Volcani Center, Agricultural Research Organization, Israel
Flowers, H.M., Department of Biophysics, The Weizmann Institute of Science, Rehovot, Israel
Ascher, K.R.S., Department of Toxicology, The Volcani Center, Agricultural Research Organization, Israel
Ishaaya, I., Division of Entomology, The Volcani Center, Agricultural Research Organization, Israel
1. 1. The effect of sucrose consumption on the feeding rate, weight, survival, excretion, activity of digestive enzymes and fecal pellet composition in larvae of Spodoptera littoralis was investigated. Dry residues from 1 2, 1 4, 1 8, 1 16, 1 32 and 1 64 M solutions on Styropor lamellae were employed. 2. 2. Feeding rates and survival indices increased with concentration, although the larvae lost weight at all concentrations. On untreated Styropor (control) the weight loss was less than at 1 8 M and below. 3. 3. Protease, amylase and invertase activity were stimulated above 1 16 M, and depressed at 1 32 and 1 64 M to below the control value. 4. 4. Free amino groups content (expressed in terms of "leucine equivalents") of the fecal pellets rose sharply at 1 32 and 1 64 M, similarly to that of control. 5. 5. No depolymerization of the Styropor carrier occurred in the digestive tract of the larvae. © 1973.
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The feeding response of the larva of the Egyptian cotton leafworm, Spodoptera littoralis boisd., to sugars and related compounds-III. Biochemical and enzymological aspects of sucrose consumption
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Meisner, J., Department of Toxicology, The Volcani Center, Agricultural Research Organization, Israel
Flowers, H.M., Department of Biophysics, The Weizmann Institute of Science, Rehovot, Israel
Ascher, K.R.S., Department of Toxicology, The Volcani Center, Agricultural Research Organization, Israel
Ishaaya, I., Division of Entomology, The Volcani Center, Agricultural Research Organization, Israel
The feeding response of the larva of the Egyptian cotton leafworm, Spodoptera littoralis boisd., to sugars and related compounds-III. Biochemical and enzymological aspects of sucrose consumption
1. 1. The effect of sucrose consumption on the feeding rate, weight, survival, excretion, activity of digestive enzymes and fecal pellet composition in larvae of Spodoptera littoralis was investigated. Dry residues from 1 2, 1 4, 1 8, 1 16, 1 32 and 1 64 M solutions on Styropor lamellae were employed. 2. 2. Feeding rates and survival indices increased with concentration, although the larvae lost weight at all concentrations. On untreated Styropor (control) the weight loss was less than at 1 8 M and below. 3. 3. Protease, amylase and invertase activity were stimulated above 1 16 M, and depressed at 1 32 and 1 64 M to below the control value. 4. 4. Free amino groups content (expressed in terms of "leucine equivalents") of the fecal pellets rose sharply at 1 32 and 1 64 M, similarly to that of control. 5. 5. No depolymerization of the Styropor carrier occurred in the digestive tract of the larvae. © 1973.
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