We determined the quantum requirements for growth (1/ϕμ ) and fatty acid (FA) biosynthesis (1/ϕFA ) in the marine diatom, Phaeodactylum tricornutum, grown in nutrient replete conditions with nitrate or ammonium as nitrogen sources, and under nitrogen limitation, achieved by transferring cells into nitrogen free medium or by inhibiting nitrate assimilation with tungstate. A treatment in which tu...

The increasing worldwide incidence of obesity and the limitations of current treatments raise the need for finding novel therapeutic approaches to treat this disease. The purpose of the current study was first to investigate the effects of tungstate on body weight and insulin sensitivity in a rat model of diet-induced obesity. Second, we aimed to gain insight into the molecular mechanisms under...

Tungstate was orally administered to 7.5-week-old male Zucker diabetic fatty (ZDF) rats that already showed moderate hyperglycemia (180 +/- 16 mg/dl). The animals became normoglycemic for approximately 10 days. Then, glycemia started to rise again, although it did not reach the initial values until day 24, when levels stabilized at approximately 200 mg/dl for the duration of the experiment. Unt...

A low protein diet (1, 2) removed about three-fourths of the xanthine oxidase from the entire rat (3), while a purified diet containing tungstate reduced the tissue xanthine oxidase to a level at which it could not, be detected manometrically (4) ; neither of these dietary procedures had any effect on the uric acid or allantoin excretion by this species. Chicks fed a tungstate-containing diet e...

The Multiple Mirror Telescope (MMT) will be converted to a single-mirror telescope in early 1998. Adaptive optics using a sodium laser guide star will be an integral part of the new telescope with adaptive correction made at the secondary mirror. The MMT AO system is under development, and will be completed for sky tests soon after telescope first light. In this paper, we give an overview of th...

Enterobacter cloacae SLD1a-1 is capable of reducing selenium oxyanions to elemental selenium under both aerobic and anaerobic conditions. In this study the enzyme that catalyses the initial reduction of selenate (SeO4(2-)) to selenite (SeO3(2-)) has been localised to isolated cytoplasmic membrane fractions. Experiments with intact cells have shown that the putative selenate reductase can accept...

Nanoparticles of ytterbium tungstate prepared through the direct addition of an Yb3+ solution to a tungstate solution, were computed through Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS). Further the supercapacitive characteristics of the nanoparticles, as a potential material for constructing electrodes, were eval...