一个Bendixson型定理及其应用

本文首先讨论不可约竞争或合作系统的闭轨的不存在性，然后讨论了负反馈系统的闭轨的存在性及稳定性．     

柑桔黄龙病病原——类细菌(Bacterium—like organism,BLO)的培养与性质

采用体外培养的方法首次从患柑桔黄龙病的柑桔树叶中分离并培养出柑桔黄龙病的病原——类细菌(BLO),测定了BLO最适培养条件及形状、大小和壁膜厚度.将培养出的BLO回接到指示植物长春花,2个月后长春花表现症状,且能重新培养出该BLO。健康柑桔树叶片及长春花均未培养出BLO。     

CCT图的计算机辅助推定模型及程序系统

提出了计算机推定焊接ＣＣＴ图的原理及模型，深入分析了１３０多种钢材的焊接ＣＣＴ图形特征与化学成分的相关性，在建立钢材化学成分、ＣＣＴ图及临界点等数据库的基础上，利用多元统计回归技术求出了推定公式中的有关参数，进而开发了程序系统ＷＣＣＴ－ＣＡＤ，应用这一程序系统，实现了给定钢材化学成分并通过一定的人机对话，由计算机自动制定出焊接ＣＣＴ图组织转变曲线的设想。     

常州市主要工业废水和两种有机毒物对罗非鱼外周血红细胞的微核效应

本试验测定了常州市主要工业废水和两种有机毒物对罗鱼非(Tilapia massambica Peters)外周血红细胞的微核效应。测定结果,1.68％和1.28％的染料废水的微核率分别为1.00‰和0.50‰;17.8％和15.0％的印染废水的徽核率均为0.53‰,18.2％和10.4％的石油化工废水的微核率分别为0.50‰和0.53‰;43％和37％的化工厂有机废水的微核率分别为0.55‰和0.60‰。由此表明,常州市主要工业废水可能具有细胞的诱变作用。两种有机毒物的微核测定结果无重现性,尚待进一步深入研究。     

Deactivation of macrophages by transforming growth factor-beta

Macrophage activation--enhanced capacity to kill, in a cell that otherwise mostly scavenges--is essential for host survival from infection and contributes to containment of tumours. Both microbes and tumour cells, therefore, may be under pressure to inhibit or reverse the activation of macrophages. This reasoning led to the demonstration of macrophage deactivating factors from both microbes and tumour cells. In some circumstances the host itself probably requires the ability to deactivate macrophages. Macrophages are essential to the healing of wounds and repair of tissues damaged by inflammation. Yet the cytotoxic products of the activated macrophages can damage endothelium, fibroblasts, smooth muscle and parenchymal cells (reviewed in ref. 6). Thus, after an inflammatory site has been sterilized, the impact of macrophage activation on the host might shift from benefit to detriment. These concepts led us to search for macrophage deactivating effects among polypeptide growth factors that regulate angiogenesis, fibrogenesis and other aspects of tissue repair. Among 11 such factors, two proteins that are 71% similar proved to be potent macrophage deactivators: these are transforming growth factor-beta 1 (TGF-beta 1) and TGF-beta 2.     

颅脑空化损伤中头皮影响的模拟研究

利用头－颈模拟装置、撞击载荷和压力响应测试系统，考察了橡胶垫和模拟头皮对载荷响应及颅内压力响应的影响．结果表明，具有压缩蠕变性的模拟头皮明显地降低了颅内液的压力响应值．颅内明胶实验还表明，对侧点负压值降低但内部负压值仍保持．     

双合环应力分析（Ⅰ）──环体应力计算

介绍双合环的计算方法：切口端按材料力学方法计算；中间部位视为整体环的一部分，按壳体理论应力分析方法计算。     

Acyl fluorides as reactive mimics of aldehyde pheromones: hyperactivation and aphrodisiac inHeliothis virescens

Summary Substitution of fluorine for the aldehydic hydrogen provides behaviorally active, chemically reactive pheromone mimics. In male moths of the tobacco budwormHeliothis virescens, Z9–14:Acf and Z11–16:Acf cause hyperactivity and irreversible extension of the genitalia in over 80% of treated moths. In addition, a combination of the two components leads to 10–50% of the pairs involving one treated partner becoming locked in copula.Supported by NSF grant PCM-8112755 and DMB-8316931, by a Fellowship from the Alfred P. Sloan Foundation (1981–85), and by Teacher-Scholar Grant from the Camille and Henry Dreyfus Foundation (1981–86) to G.D.P. Address correspondence to G.D.P.