00 Diethyl 0 -p -nitrophenyl thiophosphate (I), generally known as parathion or E 605, is an insecticide which is of value against a variety of crop pests. Its mammalian toxicity is usually ascribed to its power of inhibiting cholinesterase, and this is also possibly its mechanism of insecticidal action. The in vitro inhibition of the enzyme was first studied by DuBois, Doull, Salerno & Coon (1...

Contributions of tyrosyl residues to trypsinand chymotrypsin-inhibitory activities in two homologous proteinase inhibitors were investigated by modifying them with N-acetylimidazole under various conditions. In Bowman-Birk soybean proteinase inhibitor, Tyr 55, immediately following the antichymotryptic site, Leu 53-Ser 54, is relatively inaccessible to N-acetylimidazole and can only be acetylat...

spectrophotometric and electrochemical studies were successfully used in quantitative analysis of amitriptyline hydrochloride (ath) and nortriptyline hydrochloride (nth). conductometric titration were carried out in equeous solution using iodide and dopamine and serotonine as titrant. two new methods using spectrophotometry are dascribed for the determination of (ath) and (nth) with potassium b...

a new hydroxylamine sensor has been fabricated by immobilizing oxadiazol denvative at the surface ol aglassy carbon electrode (gce) modified by multi-wall carbon nanotube (mivcnt). the adsorbed thin illms oroxadiazol derivative on the mwcnt modified gce show a pair of peaks with surface confined characierisnus.the oxadiazol derivative mwcni (omwcnt) modified gce shows highly catalytic activity ...

Formaldehyde is a chemical used in many different industrial sectors and classified as carcinogen well causing allergic reactions. Due to the health effects of formaldehyde, which widely textile dyes auxiliary chemicals, its analysis this type matrices becomes important. In study, order meet these requirements, formaldehyde was converted oxime derivative by derivatization with o-(2,3,4,5,6-Pent...

in this work, sol-gel method was used tosynthesize titanium dioxide nanoparticles (tio2). the tio2nanoparticles was characterized by scanning electron microscopy (sem), x-ray diffraction (xrd) and bet technique.the tio2 and coumarin derivative (7-(1,3-dithiolan-2-yl)-9, 10-dihydroxy-6h-benzofuro [3,2-c] chromen-6-on) were incorporated in a graphite composite electrode. the resulting modified el...