试论人类活动对生物资源的影响

生物资源是人类生存环境的重要组成部分,是人类赖以生活的物质基础。本文探讨了人类活动对生物资源直接和间接的影响,指出人类的许多经济和社会活动已对生物资源构成了严重威胁,如毁林开荒、乱捕滥猎、盲目引种、人口剧增、环境污染等。只有尽快采取措施,制定政策法规,加强宣传教育,积极保护环境和生物资源,人类才能与大自然合谐统一、健康持续发展下去。     

血管活性肠肽在皖西白鹅延髓内的分布

应用免疫组织化学SABC染色法,对血管活性肠肽(VIP)免疫反应阳性细胞在皖西白鹅延髓内的分布进行了观察。结果发现,在皖西白鹅延髓的下橄榄核、楔束核、迷走神经背核、疑核、三叉神经脊束核和薄束核分布有VIP免疫阳性细胞。     

入侵检测系统的数据收集机制研究

基于对入侵检测所采用的数据收集方法的分类和分析，提出了一种基于多代理的分布式数据收集模型，介绍了该模型的数据收集方法和协同检测过程，该模型分别在网络的关键入口处以及主机的重要应用和网络接口处部署检测代理，各检测代理根据不同情况采用不同的数据收集方法对各种可疑数据进行收集，并通过协调代理对下层检测代理提交的数据进行协同分析。结果表明，这种数据收集模型为协同检测奠定了基础，提高了对分布式攻击的检测能力。     

内蒙产甘草中无机元素含量测定及其在临床应用中的意义

本文应用ＡＡ６７０型原子吸收分光光度计（日本岛津公司）对乌拉尔甘草中１４种金属元素的含量进行了测定，初步探讨了中药微量元素含量与临床应用的关系     

预应力弹簧托辊的力学分析

预应力弹托辊是一种新型的托辊机构,本文对其在径向载荷及轴向载荷作用下进行了受力分析,得出了预应力弹簧托辊的强度准则.根据计算知,预应力弹簧托辊的强度主要受轴向载荷的影响,弹簧托辊中间截断面是危险截面,托辊旋转时虽受循环应力作用,但应力幅值较小,强度校核时可按静态处理.     

对高校普通体育课类型与结构的实验研究

本文以篮球技术练习为手段，通过实验研究，探讨了改革高校普通体育课传统类型和结构的可行性。结果显示，在课的适当延长的准备部分中，利用篮球技术练习代替高校普通体育课常规的一般性准备活动内容，并且选择其基本技术组合对抗练习改变传统的高校篮球教学模式，可有效调动高校学生对体育课学习的积极性，有助于学生身体素质的提高和参加体育活动习惯的养成。     

胶韧革菌Gloeostereumincarnatum S.ItoetⅠ mai研究Ⅱ──深层培养

胶韧革菌Gloeostereumincarnatum发酵产物对人体六种细菌具有较强的抑制作用，已做过报道．采用编号为8903菌株对该菌株的最适深层培养条件进行了研究，测定和比较了菌丝和胶韧革菌素的产量．初步试验结果表明，较适宜的条件是（1）培养基：葡萄糖3％、蛋白股0．2％、黄豆饼粉1％、维生素B10．001％、pH6（消前），（2）温度：27℃～28℃，（3）时间约200h（4）每分通气量：30％～50％，（5）搅拌速度：120r／min．当pH值降至4左右，还原糖约1％，氨基氮在20％或更低，约8d可终止发酵．在此条件下，培养液中胶韧革菌素产量可达2．5～3g／L．     

测头的调整对齿向精度测量结果的影响

分析在万能工具显微镜上测头接触高度位置的调整误差，对斜齿轮分度圆螺旋角误差和齿向误差测量结果的影响，理论和实验结果表明，测头接触高度位置的变化地分度圆旋角误差测量结果没有影响，而对齿向误差测量结果的影响。     

Effects of Ca on the distribution, structure and morphology of aluminum species in polyaluminum chloride

The flocculation efficiency of polyaluminum chloride (PAC) is closely related to the distribution and structure of its AI species, and Al13 is the optimal species in PAC for flocculation. A series of PAC containing Ca was prepared by adding Ca before and after the basifying reaction. The effects of Ca on the Al species were studied by ^27Al nuclear magnetic resonance (NMR) and atomic force microscope (AFM) techniques. The experimental results show that the introduction of Ca increases the content of Alm and Al13 in PAC and decreases their chemical shifts in NMR spectra due to the electric repulsion between the positive Ca species and AI species and the formation of AI-O-Ca complexes.With the rise of Ca/AI molar ratio, the AI species in PAC tend to scatter. It is observed that the formerly branch-aggregated clusters are tending to form granule-aggregated ones whose diameter gets smaller and smaller, and the floccule aggregates are formed at a higher Ca/Al molar ratio. The introduction of Ca to PAC, which increases the Al13 content, is certainly to enhance the flocculation efficiency of PAC in water treatment.     

Genetic variants in novel pathways influence blood pressure and cardiovascular disease risk

Blood pressure is a heritable trait influenced by several biological pathways and responsive to environmental stimuli. Over one billion people worldwide have hypertension (≥140?mm?Hg systolic blood pressure or ≥90?mm?Hg diastolic blood pressure). Even small increments in blood pressure are associated with an increased risk of cardiovascular events. This genome-wide association study of systolic and diastolic blood pressure, which used a multi-stage design in 200,000 individuals of European descent, identified sixteen novel loci: six of these loci contain genes previously known or suspected to regulate blood pressure (GUCY1A3-GUCY1B3, NPR3-C5orf23, ADM, FURIN-FES, GOSR2, GNAS-EDN3); the other ten provide new clues to blood pressure physiology. A genetic risk score based on 29 genome-wide significant variants was associated with hypertension, left ventricular wall thickness, stroke and coronary artery disease, but not kidney disease or kidney function. We also observed associations with blood pressure in East Asian, South Asian and African ancestry individuals. Our findings provide new insights into the genetics and biology of blood pressure, and suggest potential novel therapeutic pathways for cardiovascular disease prevention.