Previous experimental natural abundance deuterium (NAD) NMR results have shown an odd/even-related alternation in the ((2)H/(1)H) ratio of the methylene groups of fatty acids (ChemBioChem 2001, 2, 425) and, by NAD NMR in CLC, a marked difference between enantiotopic deuterons for each methylenic site (Anal. Chem. 2004, 76, 2827). However, to date, the assignment of the absolute configuration fo...

The deuterium-to-hydrogen (D/H or 2H/1H) ratio of Martian atmospheric water (∼6× standard mean ocean water, SMOW) is higher than that known sources, requiring planetary enrichment. A recent measurement by NASA's Mars Science Laboratory rover Curiosity Hesperian-era (>3 Ga) clays yields a D/H ∼3×SMOW, demonstrating most the enrichment occurs early in Mars's history, reinforcing conclusions meteo...

In 5 dogs which ingested 25 or 50 ml. of D20 with one daily meal, maximal plasma concentrations of tracer were reached in 12-24 hr. The disappearance rate during 14 days was exponential, confirming studies of others in humans. Water turnover, calculated from values obtained for body water and the disappearance rates, agreed well with total water intake, which included water taken as such and th...

BACKGROUND The conventional method of measuring total body water by the deuterium isotope dilution method uses gas isotope ratio mass spectrometry (IRMS), which is both expensive and time-consuming. We investigated an alternative method, using Fourier transform infrared spectrophotometry (FTIR), which uses less expensive instrumentation and requires little sample preparation. METHOD Total bod...

Diurnal variation in human cholesterol synthesis in the rapidly exchangeable pool was studied in six healthy normolipidemic individuals by measurement of deuterium incorporation from body water into plasma cholesterol. After oral administration of D2O, free and de-esterified plasma cholesterol and plasma water were sampled over 48 h, converted to hydrogen, and deuterium enrichment was determine...

The enantioselective Michael addition using water as both nucleophile and solvent has to date proved beyond the ability of synthetic chemists. Herein, the direct, enantioselective Michael addition of water in water to prepare important β-hydroxy carbonyl compounds using whole cells of Rhodococcus strains is described. Good yields and excellent enantioselectivities were achieved with this method...

Mangrove forest trees grow in severe conditions such as diurnal submersion and high salinity surface and subsurface waters. This study focuses on two species on Mayotte Island, i.e. Ceriops tagal and Rhizophora mucronata, living in the middle range of the coastal mangrove. The seedlings of these trees were planted in a tropical greenhouse with an original pump system built to reproduce the natu...

The microscopic distribution and dynamic state of water in native potato, maize and pea starch granules are investigated with NMR relaxometry and diffusometry. Besides extra-granular water, three water populations can be identified inside native potato starch granules. These are assigned to water in the amorphous growth rings; water in the semi-crystalline lamellae and “channel water”, which is...