The retarding effect of deuterium on biological processes has been a matter of interest to many investigators. However, the early studies in this connection were concerned mainly with the biological effects of deuterium when it was present in excess amounts in the water of the medium. Little work appears to have been done on the effect of deuterium on the rates of biological reactions in which ...

The aim of this study was to investigate the validity of the Tanita TBF 300A leg-to-leg bioimpedance analyzer for estimating fat-free mass (FFM) in Bangladeshi children aged 4-10 years and to develop novel prediction equations for use in this population, using deuterium dilution as the reference method. Two hundred Bangladeshi children were enrolled. The isotope dilution technique with deuteriu...

A significant operational problem impacting upon the Space Shuttle program involves the astronaut's ability to safely egress from the Orbiter during an emergency situation. Following space flight, astronauts display significant movement problems. One variable which may contribute to increased movement ataxia is deuterium (D^O), an isotope of hydrogen/ Deuterium is present in low levels within t...

Deuterium oxide dilution space (DOS) determination is one of the most accurate methods for in vivo estimation of ruminant body composition. However, the time-consuming vacuum sublimation of blood preceding infrared spectroscopy analysis, which is traditionally used to determine deuterium oxide (DO) concentration, limits its current use. The use of isotope-ratio mass spectrometry (IRMS) to deter...

The hydrogen and oxygen isotope ratios in hydrous minerals and volcanic glass are routinely used as paleo-proxies to infer the isotopic values of meteoric waters and thus paleo-climatic conditions. We report a series of long-term exposure experiments of distal 7700 BP Mt. Mazama ash ( 149& dH, +7 & dO, 3.8 wt.% H2O) with isotopically-labeled water (+650& dH, +56 & dO). Experiments were done at ...

The effective interaction potential for charged particles is calculated in the deuterium plasma formed in the surface region of the palladium cathode in the electrolysis of heavy water. It is shown that the Coulomb potential is overscreened producing, at certain distances, an attractive potential between deuterium nuclei pairs and also between the deuterium nuclei and the surface atoms. This be...

BACKGROUND In vitro, in vivo and clinical studies have demonstrated anti-cancer effects of deuterium depleted water (DDW). The nature of this agents action, cytotoxic or cytostatic, remains to be elucidated. We here aimed to address the point by examining effects on different cell lines. MATERIALS AND METHODS 3-(4, 5-dimethylthiazol- 2-yl)-2, 5-diphenyltetrazolium bromide (MTT) -based cytotox...