城市山地保护：美国俄亥俄州辛辛那提市案例研究

记录了辛辛那提市自成立以来的发展历史,包括那些成为城市及其居民的长期财政负担的资源开发型的土地利用模式和不理智的工程实践。强调了过去40年里该市为缓解坡地不稳定性而采取的步骤,并提出了其他一些该市可以采取的关于未来山地开发的更为积极的措施。还记录了山地信托基金会（Hillside Trust）的工作,该基金会是一个成立于1976年的非营利组织,旨在倡导慎重利用和保护辛辛那提地区的山地。     

Prostaglandins, not cyclic GMP, inhibit oxytocinase isoenzymes from human amniotic fluid in vitro

Two isoenzymes of oxytocinase (EC 3.4.11.3) activity were fractionated from human amniotic fluid samples between the 14th and 22nd weeks of gestation by Ultrogel acrylamide-agarose gel filtration and partially characterized. The isoenzymes were competitively inhibited by PGE₁, PGE₂ and PGF_2α more at pH 6.2 than at pH 6.8, whereas cyclic GMP (cGMP) and its 8-bromo derivative had no effect at either pH. The implications of these findings are discussed and it is suggested that since the activity of amniotic fluid oxytocinases is very low or minimal at or near term, inhibition of these by prostaglandins may not have physiological significance in the initiation of human parturition.     

Metals in biochemistry : P.M. Harrison and R.J. Hoare,Chapman & Hall,New York, 1980, 80 pp. $5.95 (paper)

An ultrafiltration technique was used to study stripping by glycine of the first copper and zinc ion equivalents bound by bovine, dog, and rat serum albumins at pH 7.5. Affinity of dog serum albumin for copper was poorer than for the other albumins, consistent with the absence in the former albumin of the copper binding site present at the amino terminus of the latter albumins. Affinities of all three proteins for zinc were similar, suggesting that the albumin amino terminus is not the primary zinc ion binding site.     

Changing occlusal variation in Pima Amerinds

Occlusal variables and arch measurements have been recorded on 341 Pima Amerinds pertaining to two samples, one of older individuals raised on traditional diets, the other of younger individuals raised on refined commercial foods that are typical of modern urbanized people. Permanent dental occlusion is significantly more variable from defined ideals in the younger sample, despite their fewer deformities resulting from progressive aging. The youths had relatively narrower palates, correlating with a general trend among industrialized populations and also among experimental animals fed soft diets. Relative rate of deciduous tooth loss and replacement did not correlate with any occlusal variable.