14-aryl- and 14-alkyl-14-h-dibenzo [a,j]xanthenes are prepared from the reaction of aromatic- and aliphaticaldehydes with β-naphthol in the presence of catalytic amounts of 4-dodecylbenzenesulfonic acid(dbsa) as asurfactant-type brønsted acid catalyst in toluene and under solvent-free conditions in excellent yields and shortreaction times. the catalyst was recovered and reused for five successi...

background : evaluation of exposition to volatile organic compounds (voc) and compare urinary level of urinary biological exposure index in sweepers in west of iran . methods: this study was carried out on 40 street sweepers and 40 non-exposed as control group living in hamadan city, west of iran. voc was analyzed using gas chromatography equipped with a flame ionization detector (fid). the uri...

Catalysis with phosphorus P(III) compo­unds (phosphorus trichloride and phospho­rous acid) in the acylation of aniline 3=hydroxy=2=naphthoic acid various media (toluene, octane, chlorobenzene, para=­xylene, ortho=xylene, ortho=chlorotoluene, mesitylene, pseudocumene, n.=deсan, ortho= di­chlo­ro­benzene, mixtures ortho=xylene nitrobenzene) upon boiling vigorous distillation water leads to format...

1. Three peptides containing alpha-aminoadipic acid and cysteine have been obtained in small amounts from the mycelium of a Cephalosporium sp. 2. The peptides were precipitated as cuprous mercaptides together with glutathione and resolved from the latter and from each other by preparative paper electrophoresis and chromatography either in the sulphonic acid form or as S-sulphonyl derivatives. F...

Aluminium phthalocyanines substituted to different degrees with hydrophilic sulphonic acid and hydrophobic phthalimidomethyl groups were investigated in vivo as new agents for the photodynamic therapy of malignant tumours. Parameters studied included the photodynamic action on EMT-6 mammary tumours in BALB/c mice, the therapeutic window and the potential for direct cell killing, assayed via an ...

This study aims to examine the operating pressure effect on manufacture of biodiesel from Palm Kernel Fatty Acid Distillate (PKFAD) by using para-Toluene Sulfonic (PTSA) catalyst. The pressures studied are vacuum 70 kPa, 80 90 and 100 which varied with PTSA concentrations 5%, 10%, 15%, 20%, 25%, molar ratios methanol PKFAD 5:1, 6:1, 7:1, 8:1, 9:1, 10:1. Biodiesel production is carried out react...

Amphiphilic gold nanoparticles grafted with V-shaped brushes (Au-V-brushes) were prepared by grafting a polystyrene-b-poly(ethylene oxide) (PS-b-PEO) block copolymer with a trithiocarbonate group as the junction to the Au surface. The obtained Au-V-brushes were subjected to solubility test and UV-vis, FT-IR, TEM and DLS characterizations. It is found that the Au-V-brushes are soluble in both wa...

OBJECTIVE To determine the protective effects of vitamin E against the damage inflicted by reactive oxygen species during toluene induced brain injury in rats using histopathological, biochemical, and behavioral parameters. METHODS Twenty-eight Wistar albino male rats were studied at Hacettepe University Faculty of Medicine Laboratories and Gazi University Faculty of Medicine Metabolism Labor...