Tetradentate complexes of Zn (II) Schiff bases derived from DHA, o-phenylenediamine, 4- N, Diethyl amino Salicylaldehyde (L1) and Dehydroacetic Acid (DHA), 4-methyl-o-phenylenediamine, 5-bromo (L2) have been synthesized characterized by elemental analysis, magnetic susceptibility, thermal X-ray diffraction, 1HNMR, Mass, IR,UV visible spectra conductometry. The ligand field parameters found to o...

Vesicles prepared with the French press from membranes of cyanelles of Cyanophora paradoxa retain O(2) evolution activity with rates up to 500 micromoles 2,6-dichlorophenolindophenol reduced per hour per milligram chlorophyll. This activity is immediately lost when the vesicles are transferred from the sucrose-phosphate-citrate preparation buffer into dilute phosphate buffer. Similar preparatio...

BACKGROUND Type 1 diabetes is an autoimmune disease, while allergic contact dermatitis although immune mediated, is considered an exposure driven disease that develops due to epicutaneous contact with reactive low-molecular chemicals. The objective of the present study was to experimentally study the effect of contact allergens on the development of diabetes in NOD mice. As the link between con...

Manganese(II) and iron(II) macrocyclic complexes of polyamide groups have been synthesized by the template codensation of diamines (2,6 diaminopyridine, 1,2 phenylenediamine and 1,3 phenylenediame) and triamine (diethylenetriamine) with phthalic acid in 1:2:2 molar ratios. On the basis of elemental analysis, IR, electronic, magnetic moment, Mössbauer, mass and X-ray spectral studies, octahedral...

Evaluating an enzyme immunoassay (EIA) procedure based on antibody coated on solid-phase materials for assay of triiodothyronine (T3) (1), we observed a considerable improvement in the precision of this assay when the antibody coating on solid-phase matrix was carried out with shaking. In the EIA procedure, the coated beads are incubated with 30 pg of horseradish peroxidase-labeled T3 and T3 st...

Reaction of LiAlH4 with 1,2-phenylenediamine (1H4) in THF results in formation of the metallocyclic amido-/imido complex [{Al(1H2)}2{Al(1H)2}2][Li(THF)2]4 (3), while in the presence of various Lewis base ligands 1,8-diaminonaphthalene (2H4) gives the amido-('ate') complexes [Al(2H2)2](-)[Li(LL')](+) [L = THF, L' = PMDETA (N,N,N',N',N''-pentamethyldiethylenetriamine) (4); L = L' = TMEDA (N,N,N',...

A bioassay of N-phenyl-p-phenylenediamine for possible carcinogenicity was conducted by administering the test chemical in the diet to Fischer 344 rats and B6C3F1 mice. Groups of 50 rats of each sex were administered N-phenyl-p-phenylenediamine at one of two doses, either 600 or 1,200 ppm, for 78 weeks and were then observed for 26 additional weeks. Matched controls consisted of groups of 20 un...

A retinoic acid epoxidase is present in rat kidney homogenates. It is found in the particulate fraction, and is dependent on ATP, NADPH, and oxygen. It is stimulated by Fe2+ and inhibited by Mn2+, Zn2+, Cu2+, EDTA, and N,N'-diphenyl-para-phenylenediamine. Its properties are closest to those of microsomal lipid peroxidases previously studied. Epoxidase activity is not affected by the rat's vitam...

Original Article Gel staining Gel electrophoresis Native-PAGE Proteins Peroxidase activity Haptoglobin phenotyping N,N,N′,N′-tetramethyl-p-phenylenediamine,

BACKGROUND Hair dye exposure is the most common cause of sensitization to p-phenylenediamine (PPD). Cross-reactions with structurally related allergens occur. OBJECTIVES It is suggested that a stronger patch test reaction (3+ rather than 1+) to PPD (usually tested as 1% petrolatum) is associated with an increased propensity for cross-reactions. In this article we will demonstrate this associa...