New Releases by Joel Martin

Papers from a symposium and catalogue of an exhibition of Inuit art (prints, sculpture, films) at Amherst College, Mass. in April 1988.

A simulation model capable of execution on a programmable calculator was developed to study voluntary intake, liveweight change, and fertility of grade Zebu cows in the Llanos of Colombia. Organic nitrogen in the diet and meta bolic weight were used to predict intake; age, liveweight, and energy concentration were the driving variables for the maintenance prediction equation. Energy concentration was calculated as a function of crude protein and digestible organic matter, and liveweight change was predicted as a function of intake, maintenance, liveweight, and energy concentration. Multiplicative correction factors were fitted from data obtained from cow-calf experiments to adjust intake and maintenance for the effects of burning the native savanna, compensatory gain, mineral deficiency, and lactation and gestation. The correction factors were .89 for intake after burning the native savanna, 1.05 and .95 for intake and maintenance during compensatory gain, and .90 for reduced intake due to mineral deficiency. Correction factors for physiological status were 1.20 for intake during early and late lactation, and 1.40, 1.32, and 1.05 for maintenance during early lactation, late lactation, and late gestation, respectively. The correction factors for burning and compensatory gain were fitted against data from dry cows of Herds 4-5 of the Herd Systems Experiment (HSE) and yielded a Pearsonian correlation coefficient of .95 (p

Metal dialky1amides have been used to prepare complexes of the type [R[subscript 4]E] (6-x)[superscript ML][subscript 3] where R[subscript 4]E is a tetraalkylammoniuna or tetraphenylarsonium ion, L=benzene-1,2-dithiol, toluene-3 ,4-dithiol or o-mercaptophenol (for M=Ti, Zr, Hf, Nb, and Ta), L=1,2-dihydroxybenzene (for Ti and Hf), L=naphthalene- 1, 8 -dithiol (for Ti, Zr, and Hf), and x=4 (for Ti, Zr and Hf) or x=5 (for Nb and Ta), The complexes were prepared as Li or Na salts according to the general equation; M(NR[subscript 2])[subscript x] + (6 -x)NaHL + (x-3)H[subscript 2]L[superscript THF]--> NA[subscript (6-x)]ML[subscript 3] + xHNR[subscript 2].The alkali metal was then replaced by an organic cation in acetonitrile. Comparison of UV and visible spectra of the new complexes with previously isolated complexes shows that there is a shift of the lowest energy band to higher energy in the order: Ti