氧化剂

In the third chapter, the synthesis of5-[(1"S)-1",2"-diacetyl-oxyethyl]-1-phenylpyrazol-3-carboxaldehyde oxime(2) from5-[(1"S)-1",2"-diacetyl-oxyethyl]-1-phenylpyrazol-3-carboxaldehyde(1) and phenyl-hydrazine were introduced firstly. The synthesis of nine dioxapyrrolino[3,4-c]pyrazoles containing chiral pyrazolyl moiety(6a-i) from 2 with N-substituted-phenylmaleimide by nonmetal oxidant IBD-initiated intermolecular 1,3-dipolarcycloaddition was described in detail.

第三章首先以5-[(1′S)-1′，2′-二乙酰氧基乙基]-1-苯基吡唑-3-醛(1)和苯肼为原料，合成了化合物5-(1′S)-1′，2′-二乙酰氧基乙基1-1-苯基吡唑-3-醛-苯腙(2)；再用化合物(2)与N-取代苯基马来酰亚胺反应，利用无金属氧化剂—IBD引发1，3-偶极反应，发生分子间的环加成，合成了9种新型手性吡唑连二氧代吡咯啉并

In thesecond chapter, eleven 1,3,4-oxadizoles bearing chiral pyrazolyl moieties(4a-k) andfive triazolotriazines bearing chiral pyrazolyl moieties(5a-e) were obtained from5-[(1"S)-1",2-diacetyl-oxyethyl]-1-phenylpyrazol-3-carboxaldehyde(1) with arylcar-bohydrazide or (5-aryl-1,2,4-triazin-3-yl)hydrazine through an intramolecular1,3-dipolar cycloaddition in the presence of the non-metal oxidant IBD.

其中第二章介绍了以D-葡萄糖为原料制得的5-[(1′S)-1′，2′-二乙酰氧基乙基]-1-苯基吡唑-3-醛(1)分别与芳基甲酰肼、(5-取代苯基-1，2，4-三嗪-3-基)肼反应，在无金属氧化剂—IBD引发下，发生分子内1，3-偶极环加成，采用&一锅煮&法合成了11种含手性吡唑基的1，3，4-噁二唑类化合物(4a-k)和5种含手性吡唑基的三唑并三嗪类化合物(5a-e)。

The pyridinium salts was transformed by the base to 1-hydroxy or 3-hydroxy-quinolizinylides, which undergo 1,3-dipolar cycloadditionreaction with alkenes,and then aromatizated to cycl[3,3,2]azinone in thepresence of oxidant.

实验证明，这是一个连续进行的多步反应：2-羰基吡啶鎓盐在反应中先生成1-羟基或3-羟基喹嗪叶立德，然后与烯烃起1，3—偶极加成反应，最后在氧化剂作用下脱氢芳构化而生成Cycl[3，3，2]azinone。

The combustion model of the oxidizing gas and the fuel pyrolytic gas in themotor was also developed.

建立了发动机内氧化剂气体和燃料热解气体的燃烧模型，并对不同配比条件和不同燃烧室结构的燃烧反应流进行了计算。

However, BH4 stopped subsequent remodeling when NOS activity was otherwise declining. A broad antioxidant, Tempol, also reduced oxidant stress yet did not recouple NOS or reverse worsened hypertrophy/fibrosis from sustained transverse aortic constriction.

然而，在NOS活性降低时BH4阻止心脏的继续重构，广义的抗氧化剂，Tempol也可以在保持主动脉缩窄的情况下，NOS没有恢复偶联或逆转心脏肥厚或纤维化，降低氧化应激。

In this study we describe a novel strategy for assaying replicative lifespan in yeast, and apply it in a screening of mutants that are resistant to pro-oxidants.

在这项研究中，我们描述了一种新的战略寿命测定酵母中复制，并应用于筛选突变体的抗前氧化剂。

One-step extraction with polar and nonpolar mixed solvents was a method of effective comprehensive extraction for antioxidant and essential oil of rosemary (Rosmarinus officinalis L.). The method was simple on operation and was easily put into practice.

极性和非极性混合溶剂一步提取法是迷迭香抗氧化剂和精油综合提取的有效方法，操作简单，容易实施。

Methods: The model was constructed by ethanol administration orally in mice. Salisburia adiantifolia preparation was administered as antioxidant to protect the gastric mucosa.

大鼠用乙醇灌胃造模，给予抗氧化剂银杏制剂预防胃粘膜损伤，测定胃粘膜和血中的脂质过氧化物含量。

Plant polyphenols, an excellent natural antioxidant, has been studied extensively, while the extracting techniques of polyphenols, oligoprocyanidms and flavones in the root of sanguisorba haven't been reported in China.

植物多酚是一种优良的天然抗氧化剂，国内外从多个领域、多种角度对植物多酚进行了广泛的研究工作，而对地榆中多酚、低聚原花青素以及黄酮浸提工艺研究国内尚未见报道。

Was used because it contains constituents with a spasmolytic action, so that it can counteract cramps, and, it is one of the most potent natural antioxidants, so it has also an anti-inflammatory action.

使用碧萝芷因为它含有解痉作用的成分，所以能缓解痉挛，它还是最强效的天然抗氧化剂，因此它也有抗炎作用。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。