We revisit the HD molecular ion by starting from a definition of the nonrelativistic adiabatic Hamiltonian that recovers the isotopic splitting. The Hamiltonian is written in prolate spheroidal coordinates with the origin at the nuclear center of mass. This prescription for the adiabatic Hamiltonian implicitly contains the symmetrybreaking effects arising from the mass difference between the pr...

One of the most striking peculiarities of enzyme action is the fact that the activity of the enzyme is limited to a definite range of acidity. If the solution is more or less acid than this the enzyme is practically inactive. SSrensen 1 showed that for a number of enzymes the determiuing factor was the hydrogen ion concentration and not the total acidity of the solution. In attempting to accoun...

We present high-precision non-relativistic variational calculations of bound vibrational-rotational state energies for the H2 + and D2 + molecular ions in each of the lowest electronic states of Σg, Σu, and Πu symmetry. The calculations are carried out including coupling between Σ and Π states but without using the Born-Oppenheimer or any adiabatic approximation. Convergence studies are present...

to finality, and it is our present intention to refine and extend this work as much as possible on the experimental side. 1 B. Davis, Physic. Rev., 9, 64 (1917). 2 D. L. Webster, Ibid., 9, 220 (1917). 8 B. Davis, Ibid., 11, 433 (1918). 4 D. L. Webster and A. E. Hennings, Ibid., 21, 312 (1923). ' H. A. Kramers, Phil. Mag., 46, 869 (1923). 6 W. W. Nicholas, Physic. Rev., 29, 619 (1927). 7 A. Jons...

Hydrogen migrations in the molecular ions of 1,3-diphenylpropane, preceding the fragmentations to [C7H,]' and [C,H& ions, have been investigated by use of deuterated derivatives. By comparing the distribution of deuterium labels in the [C,(H, D)Jt products from metastable molecular ions with the distribution patterns calculated for various exchange models, it is shown that the H migrations occu...

1. Bromthymol blue added to rat liver mitochondria at concentrations in the range 0.4 to 4.0 mpmoles per mg of protein is tightly bound as indicated by centrifugation and washing of the mitochondria. 2. The absorbance of the dye is increased on adding Ca++ or Mn++ to the mitochondria in the absence of a permeant anion. The extent of increase is 0.03 cm-l for 167 PM Ca++ at 618 rnp for 0.5 mpmol...

This paper presents an application for measuring the concentration of hydrogen ion by using ion selective electrodes. By this research we hope to provide useful information and verify the feasibility of measuring the concentration of other ions in the same way for sensing sweat. In this research, a pH electrode is used to generate an electrical potential which reflects the concentration of hydr...

Potentiometric and spectrophotometric titrations of staphylococcal enterotoxin B have been carried out in 0.16 M KC1 at 25”. Potentiometric titration results indicate that the titration curves are essentially reversible between pH 1.50 and 11.0. All of the ionizable groups in enterotoxin B found from the titration curves are consistent with the amino acid composition which has been reported in ...

Howe and Hawk (1912) were the first to determine the exact hydrogen-ion concentration of human fjeces. They examined samples of fa}ces from three individuals and found that the reaction of the material examined by them was always alkaline, varying with the different subjects and conditions from pH 7.01 to 8.77. Nelson and Williams (1916) recorded that 29 of the 30 individuals examined by them p...