Irwin P, Damert W, Doner L: Curve fitting in nuclear magnetic resonance: illustrative examples using a spreadsheet and microcomputer.

selleck chemical Concepts Magn Reson 1994, 6:57–67.CrossRef 21. Balagadde F, You L, Hansen C, Arnold F, Quake S: Long-Term Monitoring of Bacteria Undergoing Programmed Population Control in a Microchemostat. Science 2005, 309:137–140.PubMedCrossRef Authors’ contributions PI designed all of the experiments, performed all calculations and statistical analyses, participated in running most of the experiments and drafting the manuscript. LN carried out all the TAPC and O2 electrode experiments and participated in drafting the manuscript. GP and CC assisted in the experiments using conditioned media, MM, and LB with disrupted cells and participated in O2 electrode experiments as well as drafting the manuscript. All authors read and approved the final manuscript.”
“Background Arsenic’s toxic and medicinal properties have been appreciated for more than two millennia [1]. Its two soluble inorganic forms, arsenite (+3) and arsenate (+5), entering drinking water from natural sources, have caused poisoning in Taiwan, Chile, Argentina, Bangladesh and West Bengal, and most recently arsenicosis (arsenic poisoning) has been selleck chemicals detected in people from Cambodia, Vietnam, Nepal, China, Inner Mongolia, Bolivia and Mexico [2, 3]. In addition, arsenic contamination

due to anthropogenic activity (e.g. mining) is increasing in importance in parts of the USA, Canada, Australia, Argentina and Mexico [4]. Although arsenic is toxic to most organisms, some prokaryotes have evolved mechanisms to gain energy by either oxidising or reducing it [5, 6]. Prokaryotic arsenic metabolism has been detected in hydrothermal and temperate environments Isoconazole and has been shown to be involved in the redox cycling of arsenic [7–10]. The arsenite-oxidising bacteria isolated so far are phylogenetically diverse. The oxidation of arsenite may yield useable energy or may merely form part of a detoxification

process [6]. To date, all aerobic arsenite oxidation involves the arsenite oxidase that contains two CP-690550 concentration heterologous subunits: AroA (also known as AoxB) and AroB (also known as AoxA) [6]. AroA is the large catalytic subunit that contains the molybdenum cofactor and a 3Fe-4S cluster and AroB contains a Rieske 2Fe-2S cluster [6]. Although arsenic metabolism has been detected in both moderate and high-temperature environments, and mesophilic and thermophilic arsenite oxidisers have been isolated, no arsenic metabolism (either dissimilatory arsenate reduction or arsenite oxidation) has ever been detected in cold environments (i.e. < 10°C). One such environment with high concentrations of arsenic is the Giant Mine, one of Canada’s oldest and largest gold mines. It is located a few kilometres north of Yellowknife, Northwest Territories, 62° north of the equator and 512 kilometres south of the Arctic Circle.