绵羊精液睾酮和微量元素变化与精液品质的关系

公绵羊精液睾酮（Ｔ）水平在８～１２月极显著高于１～７月（Ｐ〈０．０１）。精液锌含量在配种季节１０～１２月明显高于非配种季节６月（Ｐ〈０．０１）;铜含量在配种季节９月明显高于５～８月（Ｐ〈０．０１）;硒含量在配种季节８～９月明显高于非配种季节４～６月（Ｐ〈０．０１）;铁、锰含量在非配种季节４～６月较高。精液中硒含量变化与与种季节开始Ｔ水平的升高和精液品质的改善变化趋势一致。     

绵羊睾酮和精液品质与微量元素的季节性变化

公绵羊血浆睾酮（Ｔ）水平在８～１２月极显著地高于１～７月（Ｐ＜０．０１）;平均射精量和精子活率在９～３月均显著地高于４～８月（Ｐ＜０．０１）;精子畸形率和精子数在９～１月与２～８月有极显著差异（Ｐ＜０．０１）。血浆中锌、铜、锰水平在配种季节８～１月明显地高于非配种季节的６～７月（Ｐ＜０．０１）,并与配种季节开始后Ｔ水平的升高和精液品质改善具有明显的相关性（ｒ＝０．７３２,Ｐ＜０．０１;ｒ＝０．７８２４,Ｐ＜０．０１）。     

IGF—I和hCG对山羊睾丸间质细胞分泌睾酮的影响

采用体外培养山羊睾丸间质细胞的方法,应用ＩＧＦ－１和ｈＣＧ进行不同处理,利用放射免疫分析法（ＲＩＡ）测定睾酮含量,结果表明：（１）３０～４０日龄山羊睾丸间质细胞适宜作为体外培养的材料;（２）山羊睾丸间质细胞的敏感性随ｈＣＧ的重复刺激而下降;（３）ＩＧＦ－１能够促进睾酮的分泌（Ｐ〈０．０５～Ｐ〈０．０１）（４）ＩＧＦ－Ｉ和ｈＣＧ对睾酮的分泌具有协同促进作用（Ｐ〈０．０５～Ｐ〈０．０１）。     

急性心肌梗塞患者QT离散度的变化及临床意义

目的：探讨心肌梗塞（ＡＭＩ）患者尤其溶栓前后ＱＴ离散度（ＱＴｄ）的变化及意义。方法：电脑心电图采样,测定５８例ＡＭＩ患者与５６例健康者体表心电图的ＱＴｄ、心率校正ＱＴ离散度（ＱＴｃｄ）和改良心率校正ＱＴ离散度（ＱＴＬｃｄ）。结果：（１）ＡＭＩ组ＱＴｄ各项指标显著延长（Ｐ〈０．００１）,经过治疗后显著缩短（Ｐ〈０．０１）。（２）３２例ＡＭＩ患者经静脉溶栓再通后,ＱＴｄ各项指标显著缩短（Ｐ〈０．０１）     

饲粮中活加复合酶制剂对肉鸡生长的影响

研究了本聚糖酶、β－葡聚糖酶和纤维组成的复合酶制剂对ＡＡ商品唯恐从鸡生长和生化参数的影响,结果表明：酶制剂使肉鸡采食量和日增重分别提高４．６６％（Ｐ〈０．０５）和９．７９％（Ｐ〈０．０１）料重比降低４．７６（Ｐ〈０．０１）;加酶组肉鸡血清尿酸含量降低３６．１１％（Ｐ〈０．０１）,胆固与甘油三酯含量分别提高１５．９０％（Ｐ〈０．０１）和２０．２２％（Ｐ〈０．０５）,而ＧＰＴ和ＧＯＴ无显著变化（Ｐ〉．     

安氟醚麻醉期间妊娠母羊,胎儿血液药物浓度与血气变化

对母羊，胎儿动脉插管采集血样，气相色谱平衡法测定药物浓度，对妊娠绵羊安氟醚吸入麻醉期间母羊和胎儿血药浓度及血气变化进行了测定。结果表明，母羊和胎儿血液药物浓度显著相关（上升相，ｙ＝０．９５２９ｘ－１．３３，ｒ＝０．９４４３，Ｐ〈０．０５；消除相ｙ＝０．９６５５ｘ－１．３９３，ｒ＝０．９９９，Ｐ〈０．０１）麻醉期间母羊，胎儿血液ｐＨ略为下降（Ｐ〉０．０５）Ｐａｃｏ２上升（Ｐ〈０．０５）ＳＢＥ，Ｔｃｏ     

稀土元素对肉鸡能量氨基酸利用率的影响

选用１日龄商品代ＡＡ肉鸡２７０羽，研究稀土元素对肉鸡生长的影响。选用５４羽２９日龄公鸡进行代谢试验，研究稀土元素对肉鸡日粮中能量、粗蛋白质和氨基酸利用率的影响。结果表明：添加２０￣８０ｍｇ·ｋｇ＾－１稀土元素，可提高肉鸡增重（Ｐ〈０．０１）和饲料转化率（Ｐ〈０．０５￣０．０１），提高能量利用率（Ｐ〈０．０５￣０．０１）和粗蛋白质利用率（Ｐ〈０．０５）；添加２０￣１６０ｍｇ·ｋｇ＾－１稀土元素，可提     

用NBT还原法检测细菌无细胞溶解物中SOD活性

目的：了解不同细菌无细胞溶解物中ＳＯＤ活性。方法：采用ＮＢＴ还原法检测２株大肠杆菌和８株沙门氏菌（其中７株伤寒沙门氏菌、１株鼠伤寒沙门氏菌）无细胞溶解物中ＳＯＤ活性。结果：２株大肠杆菌ＳＯＤ活性明显低于８株沙门氏菌（Ｐ〈０．０１）;鼠伤寒沙门氏菌ＳＯＤ活性明显高于伤寒沙门氏菌（Ｐ〈０．０１）;而伤寒沙门氏菌Ｌ型返祖株ＳＯＤ活性低于其它株伤寒沙门氏菌（Ｐ〈０．０１）。结论：不同细菌的ＳＯＤ活性有差异     

小儿骶管麻醉130例临床分析

小儿骶管麻醉（ＰＣＡ）是国内常用的临床麻醉方法之一。本文就我院１３０例小儿骶管麻醉的临床资料作回顾性分析。１　临床资料１．１　一般资料　本组患儿中男９４例,女３６例,平均年龄（３．５６±２．５２）岁（１ｄ～１２岁）,ＡＳＡⅠ～Ⅱ级。手术时间２０～１８０ｍｉｎ。１．２　手术种类　剖腹探查胃肠道手术４８例,疝修补及睾丸下降固定术６４例,肛门会阴部手术１３例,其它手术５例。１．３　方法　术前禁食４ｈ,禁饮２ｈ。术前３０ｍｉｎ肌注安定０．２ｍｇ／ｋｇ,阿托品０．０１ｍｇ／ｋｇ或东莨菪碱０．００５ｍｇ／ｋ…     

EBV-LMP对人高分化鼻咽癌细胞株(CNE1)体外增殖能力的影响

目的：探讨ＥＢＶ－ＬＭＰ对人高分化鼻咽癌细胞株ＣＮＥ１增殖能力的影响。方法：以人高分化鼻咽癌细胞株（ＣＮＥ１）为对象,采用电穿孔基因转染技术,将重组ＥＢＶ－ＬＭＰ表达质粒转染ＣＮＥ１细胞。以载体质粒转染及ＣＮＥ１细胞为对照。用细胞体外增殖实验、细胞软琼脂克隆形成率测定、流式细胞仪测定各细胞周期和细胞ＰＣＮＡ的检测,观察细胞增殖能力的变化。结果：体外细胞增殖实验,Ａ比值实验组（２．８６±０．１２）显著高于空白组（１．６２±０．０５）及阴性对照组（１．３８±０．０３）（Ｐ＜０．０１）;实验组细胞软琼脂克隆形成率（２５．２％）显著高于空白组（１１．２％）及阴性对照组（１３．４％）（Ｐ＜０．０１）;ＦＣＭ法测定细胞周期,实验组Ｓ期细胞（３４．９％）高于空白组（２６．２％）及阴性对照组（３０．８％）;ＰＣＮＡ免疫组化染色,实验组细胞ＰＣＮＡ阳性率（８４．６％）明显高于空白组（６１．１％）及阴性对照组（６７．２％）（Ｐ＜０．０１）。结论：ＥＢＶ－ＬＭＰ对ＣＮＥ１细胞体外增殖能力有明显的促进作用,提示ＬＭＰ在ＮＰＣ细胞演进过程中可能起重要作用     

Segregation of form, color, movement, and depth: anatomy, physiology, and perception

Anatomical and physiological observations in monkeys indicate that the primate visual system consists of several separate and independent subdivisions that analyze different aspects of the same retinal image: cells in cortical visual areas 1 and 2 and higher visual areas are segregated into three interdigitating subdivisions that differ in their selectivity for color, stereopsis, movement, and orientation. The pathways selective for form and color seem to be derived mainly from the parvocellular geniculate subdivisions, the depth- and movement-selective components from the magnocellular. At lower levels, in the retina and in the geniculate, cells in these two subdivisions differ in their color selectivity, contrast sensitivity, temporal properties, and spatial resolution. These major differences in the properties of cells at lower levels in each of the subdivisions led to the prediction that different visual functions, such as color, depth, movement, and form perception, should exhibit corresponding differences. Human perceptual experiments are remarkably consistent with these predictions. Moreover, perceptual experiments can be designed to ask which subdivisions of the system are responsible for particular visual abilities, such as figure/ground discrimination or perception of depth from perspective or relative movement--functions that might be difficult to deduce from single-cell response properties.     

Mineralogy, petrology, and surface features of lunar samples 10062,35, 10067,9, 10069,30, and 10085,16

The primary rocks are a sequence of titanium-rich basic volcanics, composed of clinopyroxene, plagioclase, and ilmenite with minor olivine, troilite, and native iron. The soil and microbreccias are respectively loose and compacted mixtures of fragments and aggregates of similar rocks, minerals, and glassy fragments and spheres. Impact events are reflected by the presence of shock metamorphosed rock fragments, breccias, and glasses and their resulting compaction to form complex breccias, glass-spattered surfaces, and numerous glass-lined craters. Chemistry of the glasses formed by the impact events is highly variable, and the high iron and nickel content of a few moundlike features suggests that at least some of the projectiles are iron and nickel-rich meteorites.     

Research and development, productivity, and inflation

R & D, through its effects on the rate of productivity increase, can significantly restrain the rate of inflation in the medium and long run. High rates of inflation damage the workings of the price system and impair the efficiency of practically all economic activities, including R & D. Findings suggest that the percentage increase between 1969 and 1979, in total real R & D expenditures, has been exaggerated due to the inadequacy of the gross national product deflator as applied to R & D.     

Space, stars, c60, and soot

Although carbon has been subjected to far more study than all other elements put together, the buckminsterfullerene hollow-cage structure, recently proposed to account for the exceptional stability of the C(60) cluster, has shed a totally new and revealing light on several important aspects of carbon's chemical and physical properties that were quite unsuspected and others that were not previously well understood. Most significant is the discovery that C(60) appears to form spontaneously, and this has particularly important implications for particle formation in combustion and in space as well as for the chemistry of polyaromatic compounds. The intriguing revelation that 12 pentagonal "defects" convert a planar hexagonal array of any size into a quasi-icosahedral cage explains why some intrinsically planar materials form quasi-crystalline particles, as appears to occur in the case of soot. Although the novel structural proposal has still to be unequivocally confirmed, this article pays particular attention to the way in which it provides convincing explanations of puzzling observations in several fields, so lending credence to the structure proposed for C(60).     

Strategic command, control, communications, and intelligence

Command, control, communications, and intelligence (C(3)l) for nuclear forces are essential elements in the deterrence of nuclear war. The present C(3)l) system has vulnerabilities associated with its reliability, survivability, and endurance under attack, thereby weakening deterrence by increasing the ambiguity in our capabilities. Development of a reliable and enduring C(3)l) system would reduce this ambiguity. Its reliable, positive control of nuclear forces would give the national leadership more time to assess situations, ensure discriminate retaliation, and improve our ability to manage crises in general. These capabilities could help to stop a war rapidly should one start. A reliable and enduring C(3)1) system will be needed for a long time to come, even if a freeze on strategic nuclear forces is accomplished or other arms control successes achieved. Indeed, C(3)l) may be the best source today of confidence-building measures to reduce tensions and the threat of nuclear catastrophe.     

Atmospheric halocarbons, hydrocarbons, and sulfur hexafluoride: global distributions, sources, and sinks

The global distribution of fluorocarbon-12 and fluorocarbon-11 is used to establish a relatively fast interhemispheric exchange rate of 1 to 1.2 years. Atmospheric residence times of 65 to 70 years for fluorocarbon-12 and 40 to 45 years for fluorocarbon-l1 best fit the observational data. These residence times rule out the possibility of any significant missing sinks that may prevent these fluorocarbons from entering the stratosphere. Atmospheric measurements of methyl chloroform support an 8-to 10-year residence time and suggest global average hydroxyl radical (HO) concentrations of 3 x 10(5) to 4 x 10(5) molecules per cubic centimeter. These are a factor of 5 lower than predicted by models. Additionally, methyl chloroform global distribution supports Southern Hemispheric HO levels that are a factor of 1.5 or more larger than the Northern Hemispheric values. The long residence time and the rapid growth of methyl chloroform cause it to be a potentially significant depleter of stratospheric ozone. The oceanic sink for atmospheric carbon tetrachloride is about half as important as the stratospheric sink. A major source of methyl chloride (3 x 10(12)grams per year), sufficient to account for nearly all the atmospheric methyl chloride, has been identified in the ocean.