Reactions of OH and OD radicals with simple thiols and sulfides studied by infrared chemiluminescence of isotopic water products: Reaction OH + CH 3 SH revisited

2021 ◽  
Author(s):  
Nadezhda I. Butkovskaya ◽  
Don W. Setser
Keyword(s):  
Isotopic Water

High density cell water in amphibian eggs?

1979 ◽  
Vol 83 (1) ◽  
pp. 305-314
Author(s):  
K. H. Mild ◽  
S. Lovtrup ◽  
E. Forslind
Keyword(s):  
Rana Temporaria ◽  
Body Cavity ◽  
Ambystoma Mexicanum ◽  
Egg Cell ◽  
Water Density ◽  
Cell Water ◽  
Total Change ◽  
Density Values ◽  
High Density Cell ◽  
Isotopic Water

The exchange of isotopic water, 2H2O and H2(18)O has been studied in amphibian eggs. The experiments were carried out with ovarian and body cavity eggs of Rana temporaria and unfertilized eggs of Ambystoma mexicanum. The cytoplasmic diffusion coefficient for H2(18)O was found to be 4.6 × 10(−6) cm2/s, somewhat higher than that for 2H2O, 3.4 × 10(−6) cm2/s. The total change in reduced weight, delta RW, during the isotope experiments was compared with the total amount of water in the egg cell, m. The ratio delta RW/m was significantly higher than would be expected from calculations using ordinary water density values. The results are discussed in terms of different phases of structured cell water.

Permeability of different layers of the human placenta to isotopic water

1969 ◽  
Vol 26 (3) ◽  
pp. 274-276 ◽  
Author(s):  
S. J. Lloyd ◽  
K. D. Garlid ◽  
R. C. Reba ◽  
A. E. Seeds
Keyword(s):  
Human Placenta ◽  
Isotopic Water

Models of Isotopic Water Diffusion in Spherical Aerosol Particles

2016 ◽  
Vol 120 (49) ◽  
pp. 9759-9766 ◽  
Author(s):  
Ali Moridnejad ◽  
Thomas C. Preston
Keyword(s):  
Aerosol Particles ◽  
Water Diffusion ◽  
Isotopic Water

Urea transport across dog intestinal mucosa in vitro

1964 ◽  
Vol 206 (6) ◽  
pp. 1315-1320 ◽  
Author(s):  
A. A. Hakim ◽  
Nathan Lifson
Keyword(s):  
Small Intestine ◽  
Water Transport ◽  
Water Flow ◽  
Intestinal Mucosa ◽  
Bulk Flow ◽  
Urea Transport ◽  
The Relationship ◽  
And Diffusion ◽  
Isotopic Water

Mucosal membranes from the small intestine of the dog were stripped and mounted for study between two bathing fluids, as previously described. The relationship between urea and water transport, including uphill movement of urea in the direction of water flow, was that expected from a combination of bulk flow and diffusion. If sieving was present, it was minor. Results for downhill movement of D2O, the isotopic water treated as a solute, were comparable to those for urea.

scholarly journals Disentangling Coupling Effects in the Infrared Spectra of Liquid Water

2018 ◽  
Author(s):  
Kelly M. Hunter ◽  
Farnaz A. Shakib ◽  
Francesco Paesani
Keyword(s):  
Liquid Water ◽  
Electrostatic Interactions ◽  
Synergistic Effects ◽  
Potential Energy Function ◽  
Many Body ◽  
Nuclear Quantum Effects ◽  
Different Levels ◽  
Isotopic Water ◽  
Mechanical Nature

<div> <div> <div> <p>A quantitative characterization of intermolecular and intramolecular couplings that modulate the OH-stretch vibrational band in liquid water has so far remained elusive. Here, we take up this challenge by combining the centroid molecular dynamics (CMD) formalism, which accounts for nuclear quantum effects, with the MB-pol potential energy function, which accurately reproduces the properties of water across all phases, to model the infrared (IR) spectra of various isotopic water solutions with different levels of vibrational couplings, including those that cannot be probed experimentally. Analysis of the different IR OH-stretch lineshapes provides direct evidence for the partially quantum-mechanical nature of hydrogen bonds in liquid water, which is emphasized by synergistic effects associated with intermolecular coupling and many-body electrostatic interactions. Furthermore, we quantitatively demonstrate that intramolecular coupling, which results in Fermi resonances due to the mixing between HOH-bend overtones and OH-stretch fundamentals, are responsible for the shoulder located at ∼3250 cm<sup>-1</sup> of the IR OH-stretch band of liquid water. </p> </div> </div> </div>

O-exchange evidenced in Ce-Ni-MFI catalysts during water gas shift reaction: Use of isotopic water (50% H218O - 50% H216O)

2020 ◽  
Vol 263 ◽  
pp. 118365
Author(s):  
Sarah Alamolhoda ◽  
Azfar Hassan ◽  
Gerardo Vitale ◽  
Nashaat N. Nassar ◽  
Pedro Pereira Almao ◽  
...  
Keyword(s):  
Water Gas Shift ◽  
Water Gas Shift Reaction ◽  
Shift Reaction ◽  
Water Gas ◽  
Isotopic Water
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