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1.
Egyptian Journal of Chemistry. 1997; 40 (1): 39-52
in English | IMEMR | ID: emr-107795

ABSTRACT

The electrochemical behavior of some arylidene derivatives of carbohydrazides was investigated by dc-polarography, de-polarography, cyclic voltammetry, and controlled potential coulometry techniques, at a mercury electrode in 50% ethanolic Britton-Robinson buffer solutions of pH 2-10. In acidic media [pH <4], the reduction occurs along a single irreversible 8-electron wave corresponding to the cleavage of the 2 N-N bonds and saturation of the 2 C=N centers, while at 6 /7] the total limiting current decreases on increasing the pH, this decrease is accompanied with the formation of a polarographic minimum till the wave disappears completely at pH's >10. The kinetic parameters, nature of the waves, the effect of pH on the limiting current and half-wave potentials as well as the reduction mechanism are discussed


Subject(s)
Carbohydrates/chemistry , Polarography , Electrochemistry
2.
Medical Journal of Cairo University [The]. 1991; 59 (1): 75-86
in English | IMEMR | ID: emr-20990

ABSTRACT

In this study, about 88 young healthy nulliparous women in their 2nd trimester between 20 and 35 years of age with normal singlet one pregnancy were enrolled in a double-blind randomized controlled clinical trial. From 24-weeks till delivery, a dose of 2 gm/day was given to one group [n=30], while a dose of only 1 gm/day was given to another group [n=30]. A third group [n=28] of controls received no calcium supplementation. The incidence of pregnancy-induced hypertension [PIH] was found to reach 10.7% in control group compared to an incidence of 6.67% in 1-gm supplementation group and to an increase of 3.3% in the 2-gm supplementation group. Treatment was associated with a decreased level of diastolic blood pressure in late pregnancy in the high-dose supplementation group. In addition, a significant reduction of the mean level of serum parathyroid hormone [parathormone, PTH] and a significant rise of the mean level of total serum calcium was found in those receiving 2-gm calcium daily


Subject(s)
Female , Calcium , Blood Pressure
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