Amino acid analysis of P. monodon muscle

Figures for the amino acid composition of Penaeus monodon, are tabulated, and compared to those for white tuna meat

Effect of some physico-chemical factors on the survival and growth of Penaeus monodon postlarvae

Growth and survival rates of P. monodon postlarvae were examined at different temperatures, salinities, and nitrite and ammonia concentrations, using one feed level. Condition of postlarvae greatly affected the experimental results shown in some instances where very low survival rates were obtained, even for the controls. Results indicated that postlarvae from PSUB-10 and up can tolerate salinity changes of 10 to 20 ppt without prior acclimation. Survival generally appears the same for temperatures between 24 and 36 C. It appears that P. monodon postlarvae have higher temperature tolerance. Tolerance of postlarvae at the early postlarval stage is between 30 and 50 ppm of nitrate. They were more tolerant from PSUB-10 upwards. Although survival was high in runs containing nitrite, growing appears to have been affected. Postlarvae could tolerate ammonia concentrations up to about 50 ppm. At 100 ppm higher mortality rates were observed. Whether or not there was any permanent effect by nitrate and ammonia at high but apparently tolerable levels is not known

Effect of nitrite, ammonia, and temperature on P. monodon larvae

P. monodon larvae were studied for the effects of temperature, ammonia, and nitrite on survival. Toxicity levels of nitrite were found to vary with larval stage. Larvae could tolerate ammonia up to about 10 ppm, with the effect more clearly shown by the zoea stage. Survival and growth were not significantly affected by temperature, although moulting was enhanced at temperatures higher than 29 C. Larvae of P. monodon have lower tolerance toward nitrite and ammonia compared to postlarvae. Although high survival was obtained at low levels of nitrite and ammonia, it is still necessary to know their effects on metabolism, in order to examine possible biochemical parameters for diagnosing sublethal toxicity or stress

THE ISOLATION AND CHARACTERIZATION OF PEROXIDASE ISOZYMES IN WHEAT CARRYING THE SR6 ALLELES FOR RESISTANCE TO PUCCINIA GRAMINIS VAR. TRITICI

Abstract not availabl

THE ISOLATION AND CHARACTERIZATION OF PEROXIDASE ISOZYMES IN WHEAT CARRYING THE SR6 ALLELES FOR RESISTANCE TO PUCCINIA GRAMINIS VAR. TRITICI

Abstract not availabl

A Comparative Study of Enzymes in Resting and Germinating Uredospores of Two Species of Rust Fungi

In the research to be described, it was decided to follow changes in protein concentration and in the activities of certain enzymes of common respiratory pathways during germination of uredospores of the wheat stem and bean rust fungi. Techniques known to give good spore breakage and good germination were employed. Spore breakage approaching 100% is desirable. This would insure that differences in protein concentration and enzyme activities which may be observed at different germination periods are not caused by uncertainties in the extent of breakage, but rather, are due to significant changes with germination. Similarly, conditions for spore germination have to be used so that high percentage of synchronous germination occurs. For reliable comparisons at different germination periods, spores from the same lot must be used. Another object of this research was to investigate whether the endogenous carbohydrates released upon germination do inhibit certain respiratory pathways, which are undoubtedly active during germination. If these compounds were found to cause inhibition, then, their release at the onset of germination may be taken as an indication of germination regulation by endogenous substrates. Advisor: J. M. Dal