The NrtA and NrtB nitrate transporters are paralogous members of the major facilitator superfamily in Aspergillus nidulans. The availability of loss-of-function mutations allowed individual investigation of the specificity and inhibitor sensitivity of both NrtA and NrtB. In this study, growth response tests were carried out at a growth-limiting concentration of nitrate (1 mM) as the sole nitrog...

OBJECTIVES To assess the knowledge of recommended urinary catheter care practices among nursing home (NH) healthcare workers (HCWs) in southeast Michigan. DESIGN Self-administered survey. SETTING Seven NHs in southeast Michigan. PARTICIPANTS HCWs. MEASUREMENTS The survey included questions about respondent characteristics and knowledge about indications, care, and personal hygiene perta...

In the reaction between equimolar amounts of horseradish peroxidase and chlorite, the native enzyme is oxidized directly to Compound II (Hewson, W.D., and Hager, L.P. (1979) J. Biol. Chem. 254, 3175-3181). At acidic pH but not at alkaline values, this initial reaction is followed by oxidation of Compound II to Compound I. The highly pH-dependent chemistry of Compound II can be readily demonstra...

The chlorite-tetrathionate reaction has been studied spectrophotometrically in the pH range of 4.65-5.35 at T = 25.0 +/- 0.2 degrees C with an ionic strength of 0.5 M, adjusted with sodium acetate as a buffer component. The reaction is unique in that it demonstrates autocatalysis with respect to the hydrogen and chloride ion products and the key intermediate, HOCl. The thermodynamically most-fa...

Oxalate oxidase catalyzes the conversion of oxalic acid and molecular oxygen to carbon dioxide and hydrogen peroxide. Oxalate-degrading enzymes are of interest for various applications including clinical analysis of the levels of oxalic acid in blood and urine and control of oxalic acid in industrial processes, such as pulp and paper manufacture. In these applications, the presence of oxyanions...

Applying machine learning techniques to large datasets of in situ analyses has been proven be a powerful tool Earth Sciences. However, problems may arise when dealing with minerals such as chlorite, that exist solid solution rather than single, stoichiometric ideal. It can difficult determine whether the variations major element concentrations are due compositional difference mineral interest o...

This study contributes to our understanding of the evolution Hal?lar Cu-Pb (±Zn) mineralization (NW Turkey) based on mineralogical and geochemical results sulfur isotope data. The area represents local with some Zn brecciated-stockwork vein type along NE–SW fault gouge zone at lower boundary Sakarkaya Düztarla granitoid rocks. Two main zones, consisting sericite–quartz–chlorite ± kaolinite pyri...