The reaction of [Fe(N(SiM e3)2)2] with thiols RSH, elem ental sulfur, and neutral ligands L (with sulfur donor atoms, e.g. thiourea derivatives) gives [Fe4S4(SR )2L2] clusters in high yields. The structure of [Fe4S4(2.4.6-(C3H7)3C6H 2-S)2(dpdm i)2] (dpdmi: diisopropyldim ethylim idazolthion) was determ ined by X-ray crystallography. W hen [Fe4S4I4]2~ is reac ted w ith a large excess o f P M eP ...

Bacteria were isolated that could utilize quantitatively the s-triazine herbicide prometryne [N,N' -bis(1-methylethyl)-6-(methylthio)-1,3,5-triazine-2,4-diamine] or ametryne [N-ethyl-N'-(1-methylethyl)-6-(methylthio)-1,3,5-triazine- 2,4-diamine], or both, as a sole source of sulfur for growth. The success of enrichments depended on previous exposure of the soil inoculum to s-triazine herbicides...

Disproportionation reactions of chlorosilane compounds in the presence boron trichloride yield compound H[B(SiCl3)4]. Spectroscopic analyses yellow-whitish solid with IR-, Raman-, and NMR-spectroscopy (29Si, 11B) show a highly symmetric anion containing boron, which is fourfold coordinated silicon. Due to high symmetry 1J(11B,29Si) even 1J (10B, 29Si) couplings can be observed NMR spectra disso...

The effects of stoichiometry on the atomic structure and the related mechanical properties of boron carbide (B(4)C) have been studied using density functional theory and quantum molecular dynamics simulations. Computational cells of boron carbide containing up to 960 atoms and spanning compositions ranging from 6.7% to 26.7% carbon were used to determine the effects of stoichiometry on the ato...

the 24 maltiparous holstein dairy cows were allocated in a completely randomized design to study the effects of different level and source of sulfur supplement in close-up diets on blood metabolites, colostrums composition and liver performance. the mean body weight of the cows was 687.9 kg and the mean days until expected calving date was 21.8 d. the first treatment (t1) has contained 0.21% su...

Nutritional constraints often restrict yields of crops in farmers’ fields. Plant nutrient status is currently diagnosed using empirically derived nutrient norms from arbitrarily defined high and low yielding subpopulations above a quantitative yield target. Generic models can assist Compositional Nutrient Diagnosis (CND) in providing a yield cutoff value between high-and lowyielding subpopulati...

objective(s): recently we reported that the soybean 15-lipoxygenase (slo) inhibitory activity of pyrimido[4,5-b][l,4]benzothiazines largely depends on the orientation of sulfur atom of thiazine core towards feiii-oh in the active site pocket of the enzyme with subsequent oxidation of sulfur to sulfoxide. in this paper the results of a comparative study on the slo inhibitory activities of the me...