The theory for the hyperfine structure in the rotational spectrum of symmetric-top molecules containing three identical quadrupolar nuclei is discussed. Formulas and tables are given from which the quadrupole interaction energies, and the transition frequencies and intensities can be calculated for the case of nuclear spin 32. The theory is applied to the molecules CF35Cl3 and CH35Cl3 with completely satisfactory results. The bond-axis quadrupole coupling constants determined for CF35Cl3 and CH35Cl3 are −79.9±0.6 Mc/sec and −77.9±0.5 Mc/sec, respectively. Rotational constants were determined for four rotational transitions of each molecule, and the results are in agreement with centrifugal-distortion theory.
Post-partum acyclic beef cows received continuous long-term treatment with GnRH (200 or 400 ng/kg body wt/h) or the GnRH agonist buserelin (5.5 or 11 ng/kg body wt/h) using s.c. osmotic minipumps which were designed to remain active for 28 days. All treatments increased circulating LH concentrations whereas FSH remained unchanged. Ovulation and corpus luteum (CL) formation as judged by progesterone concentrations greater than or equal to 1 ng/ml occurred in 0/5 control, 4/5 200 ng GnRH, 4/4 400 ng GnRH, 4/5 5.5 ng buserelin and 3/5 11 ng buserelin cows. The outstanding features of the progesterone profiles were the synchrony, both within and across groups, in values greater than or equal to 1 ng/ml around Day 6, and the fact that most CL were short-lived (4-6 days). Only 3 cows, one each from the 400 ng GnRH, 5.5 ng buserelin and 11 ng buserelin groups, showed evidence of extended CL function. Cows failed to show a second ovulation which was anticipated around Day 10 and this could have been due to insufficient FSH to stimulate early follicular development, or the absence of an endogenously driven LH surge. The highest LH concentrations for the respective groups were observed on Days 2 and 6 and by Day 10 LH was declining, although concentrations did remain higher than in controls up to Day 20.(ABSTRACT TRUNCATED AT 250 WORDS)
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