Viswanathan,M; Paulose,C S; Lal,K J; Sharma,S K; Dakshinamurti,K(Department of Biotechnology, November 27, 1989)
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Abstract:
Moderate pyridoxine deficiency in adult male Sprague-Dawley rats results in significant hypertension,
associated with a general sympathetic stimulation , including an increase in the turnover of norepinephrine
in the heart. Treatment of these rats with pyridoxine reversed blood pressure to normal within 24 h. Treatment
of pyridoxine-deficient rats with clonidine or x-methyl dihydroxyphenylalanine (x-methyl DOPA)
also reduced the blood pressure of these animals to normal . There was also a significant increase in the
Bma, of high and low affinity [3H]p-amino-clonidine binding to crude synaptosomal membrane preparations
of the brain stem of deficient rats indicating chronic underexposure of)(, adrenoreceptors to endogenous
norepinephrin.
Jayaraj, M K; Vallabhan, C P G(IOP Publishing, 1989)
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Abstract:
The method of preparation of ZnS phosphors doped with praseodymium and copper is given. The electroluminescence (EL) spectrum of ZnS:Pr,Cl has two broad bands at 470 and 570 nm. ZnS:Cu,Pr,Cl gives white emission with spectral peaks at 470, 520, 570 and 640 nm. The EL spectra of both types of phosphor exhibit a conspicuous colour shift as the frequency of the excitation voltage is varied. Detailed investigations show that the relative intensities of spectral peaks are strongly dependent on the frequency of the excitation voltage. The colour shift is explained on the basis of the Schon-Klasens model.
Abdul Rasheed, T M; Moosad, K P B; Nampoori, V P N; Sathianandan, K(Springer, September , 1989)
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Abstract:
Vibrational overtone spectra of styrene (liquid) and polystyrene (solid), studied by the laser-induced thermal lens (for ΔV=6) and the conventional near infrared absorption (for ΔV=3–5) techniques, are reported. For polystyrene, the overtone energy-bond length correlation predicts that the aryl CH bonds are ∼0.0005 Å longer than that in benzene, while no such conclusions could be drawn on styrene. Thesp 3 CH overtones in polystyrene are observed on the low energy side of the aryl CH overtones.