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These include that the dealkylation of the aromatics with side chains, polynuclear aromatic hydrogenation under supercritical condition, cracking of naphthene and C-S C-N key.

渣油经过加氢裂化反应后,虽然其芳炭率提高了,但是它的芳香环系缩合度降低了,表明在加氢中有大量的烷基侧链断链反应发生。

The child in question had developed eczema limited to the face at around one year of age. He had been breast-fed at birth, was switched to milk-based formula at four months, and started on solid foods at five months without problems. At the time, no food reactions or worsening of the atopic dermatitis due to food exposure was seen. At the age of three, his parents, who had read about a possible link between eczema and food allergy, took him to a naturopath, who used electrodermal skin testing to look for possible hypersensitivity.

有问题的儿童,大约一岁时发生局限於脸部的湿疹,出生后就接受哺乳,四个月后转为牛奶为主的配方,并在五个月后没有问题的情况下,开始食用固体食物;在这个时候,没有发生食物引起的反应以及因为食物而恶化的异位性皮肤炎;在三岁时,他的父母偶然间得知有关湿疹与食物过敏之间可能的关连,因而带这位男童接受自然疗法医师的电表皮皮肤试验,寻求可能的过敏反应。

Methods: The two methods of nonsolvent process and solvent process were adopted to prepare oxamyl. Oxamyl was prepared in water in the first one and in acetone in the second. By the comparisons of productive cost, production purity, operation safety and equipment cost, a proper process for preparation oxamyl was adopted.

制取杀线威有两种不同方法,即非溶剂法和溶剂法,前者采用水为反应介质,后者采用丙酮为反应介质,从产品制造成本,产品纯度,操作环境的安全性以及生产设备投资等方面进行比较,确定可行的合成方法。

On the Contrary, there was no obviously different in low group.? Observed by electron microscope: The wider of synaptic cleft was increasing, the posts nutpick membrane was thinner, and the synapse I activity area was decrease, all these have significant different from that of control group in high and middle group, But no obviously change in low group.

灌酒精90天后,与对照组相比,胶质细胞纤维酸蛋白免疫反应强度增强及反应性胶质细胞的平均相对密度升高,中、高浓度组有显著性差异(p<0.01),而低浓度组无明显变化。

The results with DTA show that freewater, PEG, Hac and n-C4H9OH evaporate under 320℃. Organic compounds oxidate and precursors of the samples decoposite between 320~500℃.

热分析结果表明:样品在320℃以下有自由水、PEG、HAc、n-C4H9OH的挥发,而在320~500℃之间样品中的有机物发生氧化反应和前驱体发生分解反应。

This invention carrying through alcoholysis of common gloss polyester chip, getting low-molecular polymer of polytetramethylene terephthalate, using this low-molecular polymer as pregnant liquor, doing esterification reaction and polycondensation reaction of PTA and hybrid diatomic alcohol in normal pressure, getting the modified copolyester product which has inherent viscosity of 0. 65-0. 85dl/g, fine pellucidity and is suitable in the application of engineering plastics.

本发明是通过对普通大有光聚酯切片进行醇解,得到对苯二甲酸乙二酯低聚物,以此低聚物为母液,在常压下使PTA与混合二元醇进行酯化反应和缩聚反应,制备得到了特性粘数在0.65-0.85dl/g且具有良好透明性的适用于工程塑料领域应用的改性共聚酯产品。

This article through the belt hydroxyl aldehyde class material and the chloroacetic acid response, the synthesis intermediate, then with the neighbouring phenylene diamine responded again synthesized 6 kind of benziminazole class compound, including 4 kinds not to report.

本文通过带羟基的醛类物质和氯乙酸的反应,合成中间体,然后再与邻苯二胺反应合成了6种苯并咪唑类化合物,其中有4种还未被报道。

Therelationship of the amount of catalyst and the ee% of product was seen to be negative nonlin-ear. Catalyst 3 was used in the enantioselective addition of diethylzinc to aromatic aldehydesand gave good results. The configuration of products was determined by the configuration ofthe catalysts' chiral carbon linked with hydroxy group. Using β- amino alcohols bearing only one chiral center as catalysts for the enantiose-lective addition were studied. D-N, N-dialkyl-2-amino butanol gave poor catalytic effect be-cause of their structure. The configuration of the product is the same as the catalyst. Anotherkind of β- amino alcohols - phenylglycine derivatives and valine derivatives have chiralcenter on the carbon linked with amino group. Catalyzed by-phenylglycine derivatives 6,7, 9, 10, the reactions gave satisfied results. The optical yields exceeded 80%.

在探讨了含有两个手性中心的β-氨基醇之后,选择了只有一个手性中心的β-氨基醇,一是手性中心为连羟基的手性碳原子:D-N,N-二烷基-2-氨基丁醇;二是手性中心为连氨基的手性碳原子:D-苯基甘氨酸衍生物和L-缬氨酸衍生物。D-2-氨基丁醇的催化效果不太好,这与其结构的空间位阻较小有关系,反应产物与连羟基手性碳构型一致;由苯基甘氨酸和缬氨酸出发合成五种β-氨基醇6-10,研究了不同ee%的-6作用下的二乙基锌-苯甲醛加成反应,发现该催化剂具有不对称放大效应;-7,9,lO的催化效果也比较令人满意,光学产率80%以上,所得产物构型与催化剂构型一致。

Adverse reactions were as follows: phlebitis, allergic reaction and kidney damage.

不良反应主要有静脉炎、过敏反应和肾损害等。

In general, the phosphoamino acid esters were unable to transfer their phosphoryl group to other hydroxyl nucleophiles even with the presence of imidazole, but the N-phosphoserine and threonine esters were two exceptions.

二、测定了部分磷酰化D—氨基酸的磷酰基转移反应速率常数,并对外消旋化合物的酯交换反应进行了旋光度跟踪,发现磷酰化丝、苏氨酸的对映体有明显的区别。

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推荐网络例句

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气,收缩臀部肌肉;拱起身体,尽量抬起头来,右腿伸直朝向天花板(膝微屈,以避免肌肉紧张)。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化,但却比去年同期高8%。

However, to get a true quote, you will need to provide detailed personal and financial information.

然而,要让一个真正的引用,你需要提供详细的个人和财务信息。