氢

Simultaneously we prepared benzimidazolines with two methods by the of reduction benzimidazolium salts with NaBH_4 and Grignard addition with benzimidazolium salts. Thus we provided a new biomimic synthetic method for 13 kind of tetrahydroisoquinoline starting from carboxylic aicd and halid, gave a new idea of the synthesis for new drugs.It can make many kind ofβ-carboline alkaloids which have bioactivity to antibacterium, antivirus and antitumor to start from 1,2,3,4-tetrahydro -β-carboline.

本文以1，3-二甲基苯并咪唑碘盐和2-取代的1，3-二甲基苯并咪唑碘盐为原料，采用了NaBH_4还原和Grignard试剂加成两种方法，制备了13种1，3-二甲基苯并咪唑烷和2-取代的1，3-二甲基苯并咪唑烷作为四氢叶酸辅酶一碳单元转移新模型，在酸性条件下，以2-(3，4-二甲氧基苯基)乙胺作为接收一碳转移的亲核试剂，完成了13种重要的四氢异喹啉类化合物的新合成方法研究。

The demetalation of Ni-OEP in the presence of H2 consists of two steps. The first step is hydrogenation of nickel porphyrin to nickel chlorin, and the second step is decomposition of nickel chlorin and the removal of nickel.

，也有相当一部分镍卟啉发生分解，脱除所配合的金属；镍卟啉的临氢脱金属反应过程分为两步，第一步是卟啉分子中一个吡咯环上的外环双键加氢生成镍卟酚，第二步镍卟酚分解，金属脱除。

Oceans on Earth will boil away. The Sun will run out of hydrogen fuel in its core about 5.5 billion years from now and start burning hydrogen in the surrounding layers.

地球上的海洋将会沸腾蒸发。55亿年后，太阳内核的氢燃料将会燃烧殆尽，外层的氢燃料就会开始燃烧。

And no more than about the amount of hydrogen and most preferably at least about 25% less hydrogen.

和没有于有关氢的数量事和最宁可至少大约 25%较少的氢。

The effect of hydrogen on the change from ductile to brittle is to prevent nanocracks in DFZs from blunting into voids.

即氢使奥氏体不锈钢由韧变脆的根本原因是氢抑制了DFZ中纳米级微裂纹向空洞的转化。

The results show the hydrogen bonding is formed between acetone and water molecules and the strength of hydrogen bonging is related to the concentration of acetone.

由此说明丙酮与水分子间形成了氢键，而且氢键的强弱与丙酮水溶液的浓度有关。

Chlorine atoms were selectively introduced into the chlorin ring based on different reactivity between vinyl group at 3-position and 20-meso position by electrophilic addition and electrophilic substitution using hydrogen peroxide/hydrochloric acid, N-chlorosuccinimide, hydrogen chloride (or concentrated hydrochloric acid) as chlorinating reagent.

以过氧化氢/盐酸、N-氯代丁二酰亚胺、氯化氢为氯化剂，根据3-乙烯基和20-meso-位的不同化学反应活性，通过亲电加成和亲电取代反应，在二氢卟吩环上选择性地引进氯原子，完成8种未见报道的具有叶绿素-a基本碳架的氯代二氢卟吩衍生物的合成。

The Clostridium, has been well studies for its ability to form endospores and its potential to generate hydrogen. In this research, we focus on the indigenous Clostridia and physiological characteristics of hydrogen production.

本研究之主要目的是希望能从不同来源样本分离出高效能的产氢菌株，研究高效能产氢菌株的生理特性以作为调控其产氢能力的基础。

The Clostridium, has been well studies for its ability to form endospores and its potential to generate hydrogen. In this research, we focus on the indigenous Clostridia and physiological characteristics of hydrogen production.

中文摘要本研究之主要目的是希望能从不同来源样本分离出高效能的产氢菌株，研究高效能产氢菌株的生理特性以作为调控其产氢能力的基础。

Five hours after the noise exposure, the cochleae were harvested. mitochondria energetic function, succinate dehydrogenase activity, in the hair cells of cochleae was evaluated with a colorimetric assay using blue tetrazolium monosodium salt. the sdh-labeled organs of corti were double stained with propidium iodide, a dna intercalating fluorescent probe used to visualize the morphologic viability of hair cell nuclei.

采用琥珀酸脱氢酶（succinate dehydrogenase，sdh）染色法进行耳蜗基底膜细胞线粒体染色，细胞核dna荧光染料碘化丙啶（propidium iodide，pi）双重染色耳蜗基底膜，以未受噪声暴露动物为对照，显微镜下观察噪声暴露后耳蜗基底膜核固缩和核肿胀毛细胞琥珀酸脱氢酶染色的变化。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。