Jatuporn Tungjitwitayakul

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Diapausing larvae of Omphisa fuscidentalis contain soluble and membrane-bound trehalase in the midgut. Soluble trehalase activity accounts for three-fourths of the total trehalase activity in midgut homogenates. The exposure of diapausing larvae to juvenile hormone analog (JHA) induced pupation, accompanied by an increase in soluble trehalase activity at(More)
Two insect storage proteins, OfSP1 (75 kDa) and OfSP2 (72 kDa), were purified using three different chromatographies from the hemolymph of Omphisa fuscidentalis larvae during diapause, and their genes were cloned. OfSP1 and OfSP2 concentrations in the hemolymph were high during diapause. During pupation, OfSP1 levels decreased in the male hemolymph and(More)
Three heat shock-responsive genes, Ofhsp70, Ofhsc70, and Ofhsp90, were identified in Omphisa fuscidentalis. These genes encode proteins with molecular weights of 70, 72, and 82 kDa, respectively, and were upregulated during heat shock. Ofhsp70 was expressed actively in the pre-diapause period, but its expression was low during diapause. While Ofhsc70(More)
The maize weevil, Sitophilus zeamais Motschulsky, is a major pest of rice and other postharvest grain stocks in tropical countries. Heating and cooling treatments have been adopted to control this pest. Because heat shock protein (hsp) genes respond to temperature stress, we examined the association of hsp genes with development and thermal stress in S.(More)
Larvae of the bamboo borer, Omphisa fuscidentalis, enter larval diapause in September and pupate in the following June (Singtripop et al., 1999). We examined the changes in the responses of larvae to exogenous 20-hydroxyecdysone (20E) in order to estimate the progress of diapause development. In this respect, we adopted two terms, responsiveness and(More)
Trehalase is the hydrolytic enzyme that catalyzed the hydrolysis of trehalose to glucose. In this study, trehalase activity in the fungus-growing termite, Odontotermes feae Wasmann had been examined. Trehalase activity in digestive tract and carcass of O. feae was higher than that in wood-feeding termite, Coptotermes gestroi Wasmann. The intestinal tract of(More)
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