In this study, native tropomyosin (Per a 7) of American cockroach (CR), Periplaneta americana, caught in Thailand was purified. Also, gene sequence encoding full length tropomyosin of the CR was PCR amplified by using degenerate primers designed from gene sequences coding for P. americana tropomyosin of the database (Per a 7.0101 and Per a 7.0102; accession no.Y14854 and AF106961, respectively)...

BACKGROUND The efficacy of Piper aduncum essential oil was evaluated against Periplaneta americana adults and nymphs in the laboratory. METHODS The plant essential oil at varying concentrations ranging between 10,000 to 80,000 ppm were placed inside glass beakers, rolled horizontally to ensure the essential oil covers all sides of the beakers and exposed to adults and nymphs of P. americana. ...

In the course of attempts to isolate and characterize the ‘nesting’ or aggregation pheromone of the American cockroach, Periplaneta americana, two metabolites of tryptophane have been identified. These are oxindole and hydrocarbostyril. That these were indeed tryptophane metabolites was demonstrated by administering radiolabelled tryptophane to cockroaches following tetracycline treatment and i...

Adult male and female cockroaches, Periplaneta americana (L.) were assayed for the presence of digestive enzymes in the fore-, midand hindgut regions. Activities of αamylase, β-amylase, γ-amylase, proteinase and lipase were detected in the three gut regions except for the absence of γamylase and lipase in female hindgut. The presence of these enzymes partly explains the polyphagous feeding habi...