Scholars at home and abroad have studied the concentrations of Se in coal relationship between sulfur assignment. However, little attention has been paid to study floating coal, especially distribution pattern densimetric fractions influencing factors. A total 138 samples were collected from 14 provinces cities China test we carried out comparison with forms 81 them. 10 selected for float-and-s...

A benzidine-HzOz staining procedure and genetic tests were used for the detection of cytochrome c-deficient mutants of the cyl, cy2, cy3, cy4, and cy6 loci. The chromosomal gene, CY1, was shown to encode the primary structure of iso-l-cytochrome c from bakers’ yeast. Sixteen cyl mutants were isolated after examining over 1 million colonies. These cyl mutants could be categorized as follows: (a)...

From salt flats on the Galapagos Islands, two strains of a red photosynthetic bacterium were isolated and identified as Ectothiorhodospira mobilis, an organism first described by Pelsh in 1937. The cells are curved in a short spiral, 0.7 to 1.0 mu wide and 2.0 to 4.8 mu long. They are motile by a polar tuft of flagella. Cells contain several large stacks of lamellar membranes, carrying the pigm...

Sulfur is an abundant element which remains undepleted in diffuse interstellar gas (AV < 1) but it is traditionally assumed to deplete on dust grains at higher densities and larger AV . Photodissociation regions (PDRs) are an interesting intermediate medium between translucent and dark clouds where the chemistry and energetics are dominated by the illuminating FUV radiation field. Thus they can...

Polyhydroxyalkanoate (PHA) is a biopolyester/bioplastic that is produced by a variety of microorganisms to store carbon and increase reducing redox potential. Photosynthetic bacteria convert carbon dioxide into organic compounds using light energy and are known to accumulate PHA. We analyzed PHAs synthesized by 3 purple sulfur bacteria and 9 purple non-sulfur bacteria strains. These 12 purple b...

It has long remained elusive whether ${\mathrm{CuCo}}_{2}{\mathrm{S}}_{4}$ thiospinel shows bulk superconductivity (SC). Here we clarify the issue by studying samples of sulfur-deficient ${\mathrm{CuCo}}_{2}{\mathrm{S}}_{3.7}$ and sulfurized ${\mathrm{CuCo}}_{2}{\mathrm{S}}_{4}$. The sample a smaller lattice constant $a=9.454$ \AA{}, it is not superconducting down to 1.8 K. After full sulfuriza...

Sulfur metabolism in gram-positive bacteria is poorly characterized. Information on the molecular mechanisms of regulation of genes involved in sulfur metabolism is limited, and no regulator genes have been identified. Here we describe the regulation of the lactococcal metC-cysK operon, encoding a cystathionine beta-lyase (metC) and cysteine synthase (cysK). Its expression was shown to be negat...

Mixtures of mineral aggregate and modified sulfur, wherein the modified sulfur functions as a binder, are termed sulfur concretes or sulfur mortars depending on the form of the mineral aggregate. Molten sulfur reacted with olefinic additive, at 130-140 ºC, and then mixed with preheated filler and aggregates. Sulfur mortar samples were prepared by mixing 32 % molten sulfur, 10 % filler and 5...

Little is known of the potential for biodegradation of fluorinated sulfonates. To evaluate this potential, the following model compounds were selected: difluoromethane sulfonate (DFMS), trifluoromethane sulfonate (TFMS), 2,2,2trifluoroethane sulfonate (TES), perfluorooctane sulfonate (PFOS), and 1H,1H,2H,2H-perfluorooctane sulfonate (H-PFOS). A laboratory isolate designated Pseudomonas sp. stra...

The antibiotic albomycin is transported into cells of Escherichia coli K-12 by the same uptake system as the iron-supplying ferrichrome complex. The iron-complexing hydroxamate moieties of albomycin and ferrichrome are structurally similar. During the phase of rapid iron uptake the ‘chelators were not found in the cells. In order to understand the antibiotic activity of albomycin, it was labele...