Formation of proviruses in acute infection in vitro and in vivo

Summary Formation of DNA proviruses of RNA viruses, Sendai and Newcastle disease, was studied. DNA provirus of NDV was shown to be formed in mouse L-cells and Sendai DNA provirus in Ehrlich ascites carcinoma cells within 2–3 days post infection.     

Absence of recovery in the dark of chloroplast formation in UV-irradiatedEuglena

Summary UV-irradiatedEuglena showed recovery of liquid holding, as indicated by cell survival, but not of chloroplast formation. The addition of caffeine after UV-irradiation decreased the fraction of cells surviving, but had no effect on the chloroplast formation.     

Occurrence of dictyosteliaceae in the rhizosphere of plants in Southern India

Zusammenfassung Sechs Arten von Dictycosteliaceae sind in Indien zum ersten Mal aus bebautem und unbebautem Boden isoliert worden. Ihr Vorkommen in nichtkultivierten Böden war bis jetzt unbekannt. Die Rhizosphäre der Pflanzen scheint ein wichtiges Habitat dieser Organismen zu sein.     

Role of bile in intestinal absorption of203Pb in rats

Summary The author studied absorption of²⁰³Pb after administering intraduodenally²⁰³Pb eliminated with bile. The results obtained were compared with absorption of203Pb administered into the duodenum as²⁰³PbCl₂ in rats forming 2 groups, one with bile ducts cannulated, the other intact. It was found that bile played an important role in absorption of Pb from the gastrointestinal tract. Absorption of Pb²⁰³ is significantly reduced if the bile is drained off by means of a canula.     

Changes in binding of JH-III in hemolymph of adult femaleLocusta migratoria

Summary Hemolymph from adult femaleLocusta migratoria migratorioides was analyzed for binding of juvenile hormone III (JH-III) after allatectomy and transection of thenervus corporis allati 1 (NCA-I). These operations did not affect the apparent dissociation constant of the binding (Kd=3.3 10^–8 M). The concentration of binding sites exhibited fluctuations in relation to age and type of operation: an increased concentration of binding sites in females with disconnected corpora allata and a decreased concentration in allatectomized females. The changes in concentration of binding sites was not due to differences in water content or hemolymph volume in operated animals. The hemolymph protein concentration was reduced after NCA-I transection and even more after allatectomy. However, variations in protein concentration did not correlate with changes in concentration of JH-III binding sites. The changes in binding site concentration were related to changes in JH-titer.     

中国城市化进程中的环境抗争

城市化是经济社会发展的必然选择。然而,随着中国城市化飞速发展,也产生了城市水、大气、固体废弃物和噪声污染等一系列生态环境问题。同时,随着环境意识的增强,人们对居住环境质量的要求不断提高,致使城市化过程中环境抗争事件不断涌现。本文回顾了已有研究文献,以国外环境抗争、国内农村环境抗争与城市环境抗争作对比,突出城市环境抗争的特点;从抗争的情感基础、精英力量、弱组织化和互动过程四个方面对城市的环境抗争进行建构;从抗争力量、制度化因素、发展观念和社会力量四个方面分析当前环境抗争所面临的一系列困境。培育公民社会、更新地方政府的发展观念、加强社会科学与自然科学和管理科学之间的交叉研究等是应对当前困境最根本的出路。     

Evaluation of the hepatotoxicological effects of a drug in an in vivo/in vitro model

Both in vivo and in vitro models have certain disadvantages for the study of the chronic hepatotoxicity of drugs. The aim of this work was to evaluate a new approach based on an in vivo/in vitro model. After chronic in vivo treatment of rats with Vincamine and Vindeburnol (an eburnamenine derivative which exhibits hepatotoxic properties in man) liver cells were isolated, and functional and metabolic disorders (metabolic utilization of fructose and protein biosynthesis) were studied to determine injury. The results showed no modification of blood parameters, but a direct relationship between the dose of Vindeburnol administered in vivo and the metabolic disorders observed in vitro, evidencing the high sensitivity and reliability of this model.     

拓展非平衡系统自组织理论的研究进展

本文就物理世界中的两类组织结构描述了非平衡系统中自组织现象研究在热力学与动力学方面的研究概貌，阐述了从自组织理论到复杂系统理论、从宏观系统到量子系统、从物理系统到非物理系统的自组织理论研究进展。并针对拓展非平衡系统自组织理论两个极富挑战性的研究领域－－－化学反应－扩散－传热系统及种群生长的生态系统，在建立完整的纯粹耗散系统自组织理论与种群生长含时自组织理论的探索中提出了系列具有重要研究价值与学术意义的问题与方向。