the chrysomelid species leptinotarsa decemlineata (say), commonly known as colorado potato beetle (cpb), is an important pest of potato and other solanaceous crops. the effects of precocene i and ii, juvenile hormone inhibitors, on morphological characteristics of the chemoreceptor organs of antennae and mouthparts of l. decemlineata larvae were studied in the laboratory. different doses of pre...

Triatoma infestans, a blood-feeding insect, synchronises physiological mechanisms leading to moult with food intake. Since the corpora allata are important in moult and metamorphosis regulation, we have studied morphological changes in 4th instar nymphs (gland size, cell density, percent of animals showing mitoses and cell size). Changes were correlated with the effect of precocene II, epiderma...

A soybean flour-induced, soluble cytochrome P-450 (P-450soy) was purified 130-fold to homogeneity from Streptomyces griseus. Native cytochrome P-450soy is a single polypeptide, with a molecular weight of 47,500, in association with one ferriprotoporphyrin IX prosthetic group. Oxidized P-450soy exhibited visible absorption maxima at 394, 514, and 646 nm, characteristic of a high-spin cytochrome ...

In order to find out various bioactive compounds in flowers of Ageratum conyzoides, a weed the family Asteraceae, dried powdered were extracted analytical grade methanol and extract was examined by GC-MS. total, eight constituents identified. The predominant compound precocene II (59.50%). Three moderately abundant included ethanone, 1-(7-hydroxy-5-methoxy-2,2-dimethyl-2H-1-benzopyran-6-yl)- (9...