Previously, we presented data that indicated microbial sulfide oxidation would out-compete strictly chemical, abiotic sulfide oxidation reactions under nearly all conditions relevant to extant ecosystems (Luther et al., 2011). In particular, we showed how anaerobic microbial sulfide oxidation rates were several orders of magnitude higher than even metal catalyzed aerobic sulfide oxidation proce...

Glass cell experiments were conducted to investigate the mechanism and kinetics of mild steel corrosion in H2S environments which is accompanied by iron sulfide scale formation. By using the weight change method, the rates of corrosion and scale formation were found. It was also concluded that mackinawite is the predominant type of iron sulfide that formed on the steel surface under the test co...

We report the synthesis of several unconventional 0-, 1- and 2-dimensional copper sulfide nanostrucutures by the chemical vapor deposition method. The key factor for morphology and structure control of a variety of copper sulfide products is the tuning of deposition and growth temperature to fit for the surface energy barriers and promote different growth directions. At a high growth temperatur...

Biofilm formation in wounds is a serious problem which inhibits proper wound healing. One possible contributor to biofilm formation in a wound is the bacteria growing within the overlying bandage. To test this mechanism, we used bandages that contained a coating of organo-selenium that was covalently attached to the bandage. We tested the ability of this coating to kill bacteria on the bandage ...

A bioassay of Selsun(R) for possible carcinogenicity was conducted by applying this substance dermally to ICR Swiss mice. Selsun(R), an antidandruff shampoo, contains 2.5% selenium sulfide. Groups of 50 mice of each sex were exposed to 0.05 ml of 25% or 50% Selsun(R) in distilled water three times a week on a 2-x 3-cm clipped dorsal surface. Vehicle controls consisted of 50 mice of each sex tha...

Two strains of Rhodotorula and one of Trichosporon precipitated dissolved copper with H(2)S formed by reducing elemental sulfur with glucose. Iron stimulated this activity under certain conditions. In the case of Rhodotorula strain L, iron stimulated copper precipitation aerobically at a copper concentration of 18 but not 180 mug/ml. Anaerobically, the L strain required iron for precipitation o...

1 We use global 3-D atmospheric simulations of carbonyl sulfide (COS) to interpret 2 observations at a network of surface sites. We aim to identify the primary factors 3 underlying observed seasonal variations and to constrain COS uptake by terrestrial 4 vegetation. Model simulations based on a recent estimate of global COS fluxes (which 5 includes closure between sources and sinks) successfull...

Until ten years ago the grids of lead-acid batteries were usually made of lead-antimony alloys containing 5-11 wt. % antimony. The necessary mechanical strength and castability are easily achieved with this content of antimony. However, the unavoidable corrosion of the positive grid liberates antimony from the grid, which proves to be both unfavorable as well as unfavorable with respect to batt...

Classical experiments have demonstrated that Se compounds protect against the toxicity of several toxic metals in acute experiments with simultaneous parenteral administration of high doses of Se and the toxic metal. Blood and organ levels of the toxic metals were increased, conceivably due to formation of inert Se complexes. Less is known about effects of long-term Se status on the toxicokinet...

To develop and deliver software to the customer, validating its quality is highly important. Software testing can be performed manually or using automation tools to identify defects, assess the quality of the product and gain confidence in the software being developed. Automation tools helps in design and execution of test scripts saving time and cost involved in manual testing. This paper main...