硒对盐胁迫下番茄幼苗叶片渗透调节物质及生理指标的影响

以番茄为试验材料,对不同硒浓度对盐胁迫下番茄幼苗叶片渗透调节物质及根系活力等生理指标的影响进行研究。结果表明:硒能够降低和缓解盐胁迫对番茄植株的伤害;表现出植株干重增加显著、根系活力强。脯氨酸,可溶性糖含量以及膜脂过氧化程度显著降低;施硒水平在0.025～0.1mmol.L-1范围内具有较好减轻盐胁迫对番茄幼苗的危害的作用,其中尤以0.05mmol.L-1处理的缓解效果最好。     

英语学习中持久兴趣的培养

从探索语言学习的动机和兴趣出发,分析了影响语言学习动机的主要因素,提出了详细的训练方案,为解决既要考试出成绩又具备终身英语技能之间的矛盾提供了有效途径。     

热液铀矿床铀富集的物理化学因素

通过实验地球化学方法,得出影响热液铀矿床铀沉淀的5个主要因素:温度、静压力、流体成分、溶液pH值和溶液Eh值。利用矿物包裹体气体成分热力学计算对比,得出富矿床成矿期与成矿前的溶液pH值显著降低(△pH大);fH2,fCH4和αu较高(10-2～10-4mol/l);富含Ca2+离子;具较小过饱和度、正温度梯度、少杂质(矿化度小);适当脱碳酸或CO2(促使铀沉淀和铀硅分离),相对封闭稳定、成矿温度稍高的环境等是值得重视的对成矿有利的环境。     

Reduction behavior and kinetics of vanadium-titanium sinters under high potential oxygen enriched pulverized coal injection

In this work, the reduction behavior of vanadium-titanium sinters was studied under five different sets of conditions of pulverized coal injection with oxygen enrichment. The modified random pore model was established to analyze the reduction kinetics. The results show that the reduction rate of sinters was accelerated by an increase of CO and H₂ contents. Meanwhile, with the increase in CO and H₂ contents, the increasing range of the medium reduction index (MRE) of sinters decreased. The increasing oxygen enrichment ratio played a diminishing role in improving the reduction behavior of the sinters. The reducing process kinetic parameters were solved using the modified random role model. The results indicated that, with increasing oxygen enrichment, the contents of CO and H₂ in the reducing gas increased. The reduction activation energy of the sinters decreased to between 20.4 and 23.2 kJ/mol.     

Zinc,copper and selenium in reproduction

Of the nine biological trace elements, zinc, copper and selenium are important in reproduction in males and females. Zinc content is high in the adult testis, and the prostate has a higher concentration of zinc than any other organ of the body. Zinc deficiency first impairs angiotensin converting enzyme (ACE) activity, and this in turn leads to depletion of testosterone and inhibition of spermatogenesis. Defects in spermatozoa are frequently observed in the zinc-deficient rat. Zinc is thought to help to extend the functional life span of the ejaculated spermatozoa. Zinc deficiency in the female can lead to such problems as impaired synthesis/secretion-of (FSH) and (LH), abnormal ovarian development, disruption of the estrous cycle, frequent abortion, a prolonged gestation period, teratogenicity, still-births, difficulty in parturition, pre-eclampsia, toxemia and low birth weights of infants. The level of testosterone in the male has been suggested to play a role in the severity of copper deficiency. Copper-deficient female rats are protected against mortality due to copper deficiency, and the protection has been suggested to be provided by estrogens, since estrogens alter the subcellular distribution of copper in the liver and increase plasma copper levels by inducing ceruloplasmin synthesis. The selenium content of male gonads increases during pubertal maturation. Selenium is localized in the mitochondrial capsule protein (MCP) of the midpiece. Maximal incorporation in MCP occurs at steps 7 and 12 of spermatogenesis and uptake dereases by step 15. Selenium deficiency in females results in infertility, abortions and retention of the placenta. The newborns from a selenium-deficient mother suffer from muscular weakness, but the concentration of selenium during pregnancy does not have any effect on the weight of the baby or length of pregnancy. The selenium requirements of a pregnant and lactating mother are increased as a result of selenium transport to the fetus via the placenta and to the infant via breast milk.     

樊庄地区山西组煤层控气综合因素分析

煤层气藏最典型的特征是煤层自生自储,因此煤储层的特征是煤层气成藏的核心要素。为了研究樊庄地区山西组3#煤储层的富集成藏特征,现在主要从樊庄地区3#煤源岩条件、物性特征、保存条件、构造控藏模式这几个方面分析该地区煤层气富集的原因。综合结论认为该地区突出的优势是煤层厚度大,稳定,物性好,含气量大,加之较好的保存条件和构造控藏模式,因此在该地区形成煤层气富集。这项研究对该地区煤层气后续勘探和开发都具有重要的意义。     

DAN荧光法测定杜仲翅果仁的微量硒

采用2,3-二氨基萘（DAN）在pH值为1.5～2.0条件下与样品中的四价硒生成4,5-苯并苤硒脑配合物,经环己烷萃取,利用荧光光度法对杜仲翅果仁中的微量硒进行测定,操作简单、灵敏度高,结果准确、重现性好.     

电沉积银铟硒薄膜的光电化学特性研究

在钛片上用电沉积方法制得银铟硒薄膜,测试了银铟硒薄膜在多硫、多碘等氧化还原偶介电质中与铂电极（或石墨电极）构成的ＰＥＣ电池的开路光电压和短路光电流,研究了化学修饰对其光电效应的影响。     

粗糙脉孢霉瓜氨酸需求型突变株的分离

对粗糙脉孢霉双突变株ａｒｇ－４,ａｒｇ－１３进行了紫外诱变,利用过滤富集法分离了不能利用乌氨酸,能利用瓜氨酸的３个突变株,利用互补针分离的约６０个突变株分成了４个互补群,这可能代表４个独立的基因位点。     

水样中无机硒含量的测定

在一定条件下,硒酸盐能定量地被还原为亚硒酸,由ＰＡＲ极谱分析仪分析体系中亚硒酸的总量,用该法测定水样中无机硒的含量,结果令人满意。