The structural relation between malachite and the brochantite MDO (maximum degree of order) polytypes is discussed. It is demonstrated that the same building blocks which form the basis of brochantite polytypism also occur in malachite. The different arrangements of these building blocks in the two mineral structures are rationalized as a result of the different coordination geometries required...

pyrene and tran8-4,5-dihydro-4,5-dihydroxypyrene, were present in the bile of rats treated with pyrene. 3. In the oxidation of pyrene with perbenzoic acid an intermediate was formed, believed to be 4,5-epoxy-4,5-dihydropyrene, which reacted with water to yield tran8-4,5-dihydro-4,5-dihydroxypyrene and with N-acetyl-L-cysteine to form Nacetyl-S-(4,5-dihydro-4-hydroxy-5-pyrenyl)-L-CySteine. 1-Hyd...

The title compound, [NH3(CH2)4NH3](2+)·SiF6 (2-), is a hybrid built from an organic butane-1,4-di-ammonium dication linked to a hexa-fluoro-silicate mineral anion. Both ions posses inversion symmetry. In the anion the Si atom is located on an inversion center, while in the cation the center of inversion is situated at the mid-point of the central -CH2-CH2- bond. The Si atom is surrounded by six...

In a preliminary note there was outlined the isolation of a crystalline glucuronido-glucosamine disaccharide, designated hyalobiuronic acid, from umbilical cord hyaluronate by combined enzymatic and partial mineral acid hydrolysis (1). In subsequent articles the use of this compound as a basis for structural work on the polysaccharide and as a reference point for interpretation of enzymatic dat...

An axenic culture o f Symphyogyna brongniartii has been initiated from spores on modified Benecke medium. Growth was best on Gamborg B5 medium with 0.3% sucrose, with a doubling time o f 36 days. The culture produced the same terpenoids as plants growing in their natural habitat, perrottetianal A being the major constituent. Also found were bicyclogermacrene, ß-barbatene, 8-selinene, ß-cubebene...

Sulfur mustard (SM) is a mutagenic compound that causes oxidative stress, antioxidant depletion even several years after exposure. Melatonin is an alternative medication that has antioxidant peroperties. The aim of this study was to investigate the effect of melatonin treatment on serum levels of several mineral elements, total antioxidant (TAC) and total oxidant status (TOS) in sulfur mustard-...

The aim of this research was to develop a simple procedure for a highly sensitive determination of low-molecular-weight (LMW) carbonyl compounds in drinking water and natural water. We employed a preconcentration HPLC system with 2,4-dinitrophenylhydrazine (DNPH) for the determination of LMW carbonyl compounds. A C-18 reverse-phase preconcentration column was used instead of a sample loop at th...

statement of problem: low- fusing compound (type 1) is used for border molding and impressions. flow and reproducibility of surface detail are two important characteristics of these materials. there are no valid data available comparing domestic and imported brands. purpose: the purpose of this study was to evaluate these two properties of four different products including kerr (kerr manufactur...

Salvadora persica is a medicinally important plant mainly used in oral hygiene. However, little attention has been given towards the nutritional prominence of this plant. This study encloses the proximate and mineral nutrient contents, amino acid composition, metabolite profiling and antioxidant potential of S. persica fruit. The ripen fruit contained substantial amount of sugars, mineral nutri...