the toxicity of chlorpyrifos to three iranian populations of two-spotted spider mite, collected from isfahan (isr), yazd (yz) and guilan (gus2) provinces were surveyed using the residual contact vial bioassay. the bioassay results showed that resistance ratios of isr and yz populations were 176.90 and 9.78 fold compared to the gus2 population, respectively. determination of esterase and glutath...

Although the biopsychosocial model has been a popular topic of discussion for over four decades it has not had the traction in fields of research that might be expected of such an intuitively appealing idea. One reason for this might be the absence of an identified mechanism or a functional architecture that is authentically biopsychosocial. What is needed is a robust mechanism that is equally ...

The aromatization of androgens to estrogens by placental aromatase involves three hydroxylations which take place in sequence. The first two occur at the C-19-methyl group while the site of the final and rate-determining hydroxylation has been identified as being at 2ß.The product of this reaction collapses to estrogen by a rapid nonenzymatic mechanism. The absence of a direct relationship bet...