Showing papers by "University of Peradeniya published in 1979"
TL;DR: Both bulls had similar testosterone profiles within each sampling period but differences were evident between periods, the mean concentration being highest in August and falling through December and April to the lowest levels in May.
12 citations
01 Jul 1979
TL;DR: The second republic of Sri Lanka (1978) and its significance was discussed in this article, where the authors considered the constitution of the second republic and its effect on the country's political system.
Abstract: (1979). The constitution of the second republic of Sri Lanka (1978) and its significance. The Journal of Commonwealth & Comparative Politics: Vol. 17, No. 2, pp. 192-209.
6 citations
TL;DR: A triprenylated tetrahydroxanthone isolated from C. zeylanicum has been shown to be 6,8-dihydroxy-1,1,7-tri(3-methylbut-2-enyl)-2-oxo, 1,2,3,4-tetrahedron-9-one by chemical and specroscopic methods as mentioned in this paper.
4 citations
01 Jul 1979
TL;DR: Explicit expressions for X transition frequencies in NMR spectra of [A[X]2]2 spin systems are derived for the case where one of the coupling constants is much larger in magnitude than any of the other couplings, as is commonly encountered for molecules containing PF2 groups as discussed by the authors.
Abstract: Explicit expressions for X transition frequencies in NMR spectra of [A[X]2]2 spin systems are derived for the case where one of the (A. X) coupling constants is much larger in magnitude than any of the other couplings, as is commonly encountered for molecules containing PF2 groups. The spectra to be expected are compared with those for the corresponding magnetic equivalence [AX2]2 case. Emphasis is placed on the determination of relative signs of coupling constants, and examples of spectra for fluorinated diazadiphosphetidines are discussed.
Fur die Frequenzen der X-Ubergange der NMR-Spektren eines [A[X]2]2-Systems werden explizite Ausdrucke fur den Fall hergeleitet. daB eine der (A, X)-Kopplungskonstanten alle anderen betragsmaBig weit ubertrifft, wie dies fur die meisten Molekule der PF2-Gruppe der Fall ist. Die zu erwartenden Spektren werden mit denen eines [AX2]2-Spinsystems, bei dem magnetische Aquivalenz vorliegt. verglichen. Hierbei wird besonderer Wert auf die Bestimmung der relativen Vorzeichen der Kopplungskonstanten gelegt. Als Beispiele werden Spektren fluoreszierender Diazadiphosphetidine diskutiert.
2 citations
TL;DR: In this article, the triterpenes zeylanol, zeylanonol and zeylandiol isolated from Kokoona zeylanica have been identified as 6β-hydroxyfriedelan-3.1, 6β,21β-dihydroxyfriedelin-1.3,21-dione and 6β 21β-hexane-3-one, respectively by spectroscopic methods and chemical interconversions.
1 citations