The effect of a magnetic field on the oxidation of hypophosphite ion catalyzed by electrolessly deposited nickel in aqueous deuterium oxide solution was studied. The steady rate of gas evolution was affected by both the magnetic field and the concentration of deuterium oxide. Such an effect was due to the magnetic spin rephasing of a radical pair of atomic hydrogen and atomic deuterium. The ratio of fractions of active sites occupied by atomic hydrogen and deuterium increased with magnetic flux density, but decreased with the mole percentage of deuterium oxide. The results indicated that the recombination rate of the radical pair of atomic hydrogen and atomic deuterium was affected by the magnetic field. A reaction mechanism of the oxidation of hypophosphite ion based on adsorption was proposed, and a steady rate equation was obtained experimentally. Based on the results of the steady rate, an empirical rate equation was obtained for the magnetic flux density B in the range 0.15−0.30 T, r s = 6.20(0.965 × exp(5.62B)[H2O]/[D2O])/(1 + 0.965 exp(5.62B)[H2O]/[D2O]) + (2.92 exp(1.46B))/(1 + 0.965 × exp(5.62B)[H2O]/[D2O]).

Early identification of cognitive impairment would allow affected patients to receive care at earlier stage. Changes in the arterial stiffness have been identified as a prominent pathological feature of dementia. This study aimed to verify if applying machine-learning analysis to spectral indices of the arterial pulse waveform can be used to discriminate different cognitive conditions of community subjects. 3-min Radial arterial blood pressure waveform (BPW) signals were measured noninvasively in 123 subjects. Eight machine-learning algorithms were used to evaluate the following 4 pulse indices for 10 harmonics (total 40 BPW spectral indices): amplitude proportion and its coefficient of variation; phase angle and its standard deviation. Significant differences were noted in the spectral pulse indices between Alzheimer’s-disease patients and control subjects. Using them as training data (AUC = 70.32% by threefold cross-validation), a significant correlation (R2 = 0.36) was found between the prediction probability of the test data (comprising community subjects at two sites) and the Mini-Mental-State-Examination score. This finding illustrates possible physiological connection between arterial pulse transmission and cognitive function. The present findings from pulse-wave and machine-learning analyses may be useful for discriminating cognitive condition, and hence in the development of a user-friendly, noninvasive, and rapid method for the early screening of dementia.

Effects of magnetic field on the electroless nickel/cobalt deposition using electroless nickel/γ-Al2O3 as the support and a hypophosphite ion as the reducing agent in the alkaline solution were studied. The active sites for electroless nickel/cobalt deposition were divided into three types in which the first type of active sites were occupied by both nickel ion and cobalt ion and the second and third types of active sites were occupied by the hypophosphite ion. Three exponential equations for the rate constants of nickel, cobalt, and hypophosphite ions were obtained, respectively. The plots of logarithms of rate constants were linear with the square of magnetic flux density. Based on the results of hydrogen gas evolution rate, the recombinations of Ni+ a •/Ha • and Co+ a •/Ha • radical pairs were affected by the magnetic field; however, the Ha • radicals did not separate from these radical pairs.

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