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Extractions of alkali metal (Na-Cs) picrates (MA) with 15-crown-5 (15C5) into various diluents of low dielectric constant were conducted at 25 degrees C. Using the extraction data, the ion-pair formation constants (K(MLA)) in water of 15C5-MA 1:1:1 complexes were determined by an equation derived from the regular solution theory (logK(MLA)=4.43+/-0.27 for(More)
Two hundred cases of lower uterine segment caesarean section were studied in SSKM Hospital and IPGME&R, Calcutta (a referral hospital) during the period 1986-1987. All were unselected cases of which 192 were booked and 8 were unbooked. The maximum number of caesarean sections were done in the age group of 21-30 years ie, in 154 cases (77.00%). Of total(More)
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