并殖吸虫第二中间宿主一新种——平和华溪蟹(十足目:短尾派)

本文记述了采自福建省平和县的淡水蟹华溪蟹属Sinopotamon一新种——平和华溪蟹S.pinheensesp.nov;蟹体内并殖吸虫囊蚴感染率为100％(21/21)。     

Nα-quinaldyl-L-arginine·HCl,a new defensive alkaloid fromSubcoccinella-24-punctata (Coleoptera,Coccinellidae)

The isolation of N-quinaldyl-L-arginine·HCl (1) from the CoccinellidaeSubcoccinella-24-punctata is reported. The structure, first established on the basis of the analysis of the spectral properties of1, has been confirmed by synthesis. The alkaloid is of endogenous origin and markedly deterrent to ants.     

Molecular evidence for increased hematopoietic proliferation in the spleen of the b/b laboratory rat

The splenomegaly and the appearance of a significant number of CFU-E (erythroid colony-forming units) and BFU-E¹ (erythroid burst-forming units) in the Belgrade laboratory rat (b/b) spleen prompted us to analyse further the molecular evidence for increased hematopoietic proliferation in the b/b spleen. Messenger RNAs (mRNAs) specific for globins, proteins for iron transport and deposition and the band 3 protein were used in rat erythropoietic tissues as markers for proliferation and erythroid differentiation. In the b/b spleen, all mRNAs analysed display an erythroid-specific pattern of expression. This analysis also revealed an enhanced level of mRNA for ferritin in the +/b spleen, whereas erythrocyte-specific mRNA production was normal.     

Antiviral activities of anthraquinones,bianthrones and hypericin derivatives from lichens

The antiviral activities of some naturally occurring anthraquinones bianthrones, and hypericin derivatives were compared by the end-point CPE (viral cytopathic effects) method and plaque assays. Under optimal conditions of exposure to light, hypericin, 7,7-dichlorohypericin and 5,7-dichloroemodin exhibited strong inhibitory activity against HSV-1 (herpes simplex virus type 1) in both assays. Partial inactivation of the virus was shown by emodin, 7-chloroemodin and 7-chloro-1-O-methylemodin; the bianthrones and other anthraquinones were found to be inactive. Antiviral activity appeared to be, positively correlated with increasing substitution of chlorine in the anthraquinone structure. In the absence of light, only hypericin and 7,7-dichlorohypericin displayed detectable activity.     

Cyclophosphamide-impaired regulation of hepatic heme metabolism

Summary Im male rats hepatic cytochromes b₅ and P-450 were reduced at different times after treatment with cyclophosphamide (CP) (200 mg/kg i.p. for 3 days). In contrast, microsomal heme did not change until 48 h after the last dose of CP, leading to accumulation of heme in a non-cytochromal form. Parallel to the above changes the heme metabolism showed derangement: -aminolaevulinate synthase, the rate-limiting enzyme in heme synthesis, was depressed and heme oxygenase, the enzyme which catalyzes the oxidative degradation of heme, was increased.     

地球化学异常对白银市供水水源影响预测

白银地区为多金属成矿区.因其特殊的地球化学环境,拟建的城市生活用水供水工程区,铜、铅、锌、砷、锰、镉等元素的背景值较高.本文通过对水源库的水环境分析,以镉元素水库水质影响设计出未来水源库运行条件下的水质模型,预测了在水库设计运行方案下近期和远景水库水质可满足生活饮用水卫生标准的结论.     

学校体育学课程内容新体系的构建

以课程编制理论为依据，采用文献法、专家调查法，结合基础教育课程改革的具体实际，构建了学科研究对象清晰明确、课程结构合理、内容完善、概念术语规范的学校体育学课程内容新体系．     

节水灌溉远程控制系统的结构及其通信设计

搞要：介绍一种以Visual Basic 6．0为开发平台，采用三级结构的计算机远程控制节水灌溉自动控制系统的设计方案．利用计算机，通过通信控制器(现场服务器FCC5000)远程控制灌区阀门，实时采集各种数据，以实现节水灌溉目的.     

卤化物与水玻璃复合物的抑尘性能

在恒温箱中测定了粉尘试样添加ＣａＣｌ２或ＭｇＣｌ２和水玻璃后的含水率与环境温度、湿度、有效抑尘时间等因素之间的关系．研究结果表明：（１）当环境温度低于３１℃，相对湿度高于６０％，粉尘试样中ＣａＣｌ２和水玻璃含量的质量分数分别达到２０％和１０％（ＭｇＣｌ２和水玻璃含量的质量分数为２３％和１１．５％）时，试样的含水率就能保持大于５％（质量分数）；（２）当环境温度低于４０℃，相对湿度高于５０％，粉尘试样中ＣａＣｌ２和水玻璃含量的质量分数分别达到２６％和１３％（ＭｇＣｌ２和水玻璃含量的质量分数为３０％和１５％）时，试样的含水率就能保持大于５％（质量分数）；（３）ＣａＣｌ２或ＭｇＣｌ２与水玻璃复合后，其粘尘功能进一步增强，而且其溶液的弱酸性得到进一步降低。     

烃源岩中烷基二苯并噻吩组成及其地球化学意义

对一个海相地层的实际剖面进行了研究，发现烃源岩芳烃馏分中烷基二苯并噻吩和烷基苯并萘噻吩的相对丰度与碳酸盐矿物含量间有良好的正相关性．不同岩性中含硫芳烃相对丰度的变化顺序是：碳酸盐岩＞泥灰岩＞泥质岩．在深度剖面上，二苯并噻吩（ＤＢＴ）与甲基二苯并噻吩（ＭＤＢＴ）呈消长关系。４－ＭＤＢＴ和２＋３－ＭＤＢＴ的相对丰度随埋深增加而增加．１－ＭＤＢＴ则随之下降，４－ＭＤＢＴ／１－ＭＤＢＴ值和２＋３－ＭＤＢＴ／１－ＭＤＢＴ值能较好地反映有机质的热演化程度．