Identifying the source of Earth's water is central to understanding the origins of life-fostering environments and to assessing the prevalence of such environments in space. Water throughout the solar system exhibits deuterium-to-hydrogen enrichments, a fossil relic of low-temperature, ion-derived chemistry within either (i) the parent molecular cloud or (ii) the solar nebula protoplanetary dis...

Of all the substances used for the estimation in vivo of total body water content, the most attractive are the isotopes of hydrogen, since they enter into all the metabolic processes involving water and have no selective secretion or storage. Deuterium was the first substance used for body water estimation in vivo (Hevesy and Hofer, 1934) and is preferable to tritium because it is not radioacti...

Fractionation of stable isotopes in precipitation runs through the water cycle, and deuterium excess is a second-order parameter linking water-stable oxygen hydrogen isotopes. It strongly influenced by under-cloud evaporation unsaturated air, especially arid climates. Based on improved Stewart model, this study used 670 isotope data measured meteorological element from 11 sampling points Januar...

The amount of 11s aggregate in phycocyanin, normally stimulated by hydrophobic forces, is dramatically increased by the presence of deuterium oxide. Proteins in which hydrophobic forces are not proposed as a mechanism for aggregation are unaffected by deuterium oxide. These observations are consistent with the lower critical micelle concentration reported for ionic detergents in deuterium oxide...

In order to determine human triglyceride fatty acid (TG-FA) synthesis rates, the incorporation of deuterium from the plasma water pool in vivo into TG-FA was measured over 48 h in six healthy males under steady state conditions. Subjects consumed a nutritionally complete liquid diet as six evenly spaced small meals per day for 3 days and drank 0.7 g D2O/kg estimated body water, (99.8 APE) at 08...

BACKGROUND Hyponatraemia is the commonest electrolyte disturbance of hospital inpatients. Assessment of volaemic status is an important part of diagnosis and management. AIM To determine reliability of clinical assessment of volaemic state by assessing inter-observer variability of clinical measures of volaemic state. To assess validity of bioelectrical impedance analysis as a tool to measure...

utilization of photodisintegration reaction of deuterium, 2h(?,n)1h, is a precise technique for determining the percentage of 2h in tritiated and natural water. the 23na(n,?)24na reaction is a suitable ?-source for producing the 2h(?,n)1h reaction. tehran research reactor was used as a neutron source for producing 24na isotopes. the bf3 detectors were used to detect the neutron emission of h2 c...

Using data from the 2015 Residential Water Consumption Survey, this study examines residential water-use behavior and attitudes after the recent drought in Fresno, California. Spatial autoregressive models of residential water consumption were estimated, accounting for the effects of social interactions in communities (i.e., neighborhood effects), while controlling for indoor and outdoor house ...