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     However,the ultimate sensitivity is about 50 mGy.
     双加环畸变分析可作为小剂量持续照射的可信赖的生物剂量仪,但存在一个应用上的累积剂量阈值,其值约为50mGy。
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     LOX exhibit co oxidase activity toward xenobiotics in the presence of polyunsaturated fatty acid (PUFA) or some other chemicals, in addition to catalyzing the stereo specific dioxygenation of PUFA.
     除对多不饱和脂肪酸 (PUFA)双加氧作用外 ,在PUFA或某些其他化合物参与下 ,其对外源化合物具有协同氧化酶活性。
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     Induction Hardening of Gear by Duel Frequency Induction Heating
     齿轮的频感应热淬火
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     Characteristic Impedance of Ridged Pairedstrip
     带线的特性阻抗
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     Dual Lenses
     透镜
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     According to the above results, Rps.
     Rps.
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     AN ANEMOMETER WITH TWO HOT WIRES
     热线风速仪
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In the presence of catalyst-H3PO4, α-pinene isomerizes to mono-cyclic terpene. As the terpene reacts with maleic anhydride at 150-200℃,terpene-maleic anhydride (T-M) adduct is obtained and then separated by H3PO4. The structure of the part insoluble in H3PO4 is confirmed to be terpene-maleic anhydride Diels-Alder adduct (di-adduct) by element analysis, TR and NMR spectra. The adduct possessing active and good curing ability for epoxy resin is proved by alkaline solution and epoxy resin curing tests (IR spectrum,...

In the presence of catalyst-H3PO4, α-pinene isomerizes to mono-cyclic terpene. As the terpene reacts with maleic anhydride at 150-200℃,terpene-maleic anhydride (T-M) adduct is obtained and then separated by H3PO4. The structure of the part insoluble in H3PO4 is confirmed to be terpene-maleic anhydride Diels-Alder adduct (di-adduct) by element analysis, TR and NMR spectra. The adduct possessing active and good curing ability for epoxy resin is proved by alkaline solution and epoxy resin curing tests (IR spectrum, shear strength and coating performance tests). It is quite different from P. Penczek's conclusion. On the basis of these, continuous feeding at 140ccccccccc in H3PO4 and cleco-lorization with I for the synthesis of T-M adduct, and the synthesis and application of low MW T-M epoxy resin are also studied.

α-蒎烯在磷酸催化下异构化为单环萜烯,经热反应(150-200℃)所得萜烯-马来酸酐(T-M)加成物再以磷酸分离,不溶于磷酸者经元素分析、红外光谱、核磁共振谱测定证实结构为Diels-Alder加成物(双加成物)。通过碱液试验及环氧树脂固化试验(红外光谱、剪切强度、涂膜性能测定)证明双加成物的环酐有活性,是环氧树脂良好固化剂,得到与P.Pcnczek不同的研究结论。在此基础上,研究了磷酸催化、高温(140℃)加料、碘脱色等合成T-M加成物的方法及T-M低分子量环氧树脂合成与应用。

An organism, identified as Pseudomonas sp. P(12) was isolated from an enrichment culture,in which phenanthrene was served as sole carbon and energy sources. Dioxygenase was detected in the bacterium by the method of indigo production.There was an accumulation of 3-phenanthrol during the growth of the cells in phenanthrene medium. Using gel electrophore-sis technique, the organism was found to harbour a plasmid and they could fail to grow on phenanthrene plate with curing of plasmid, indicating that the plasmid...

An organism, identified as Pseudomonas sp. P(12) was isolated from an enrichment culture,in which phenanthrene was served as sole carbon and energy sources. Dioxygenase was detected in the bacterium by the method of indigo production.There was an accumulation of 3-phenanthrol during the growth of the cells in phenanthrene medium. Using gel electrophore-sis technique, the organism was found to harbour a plasmid and they could fail to grow on phenanthrene plate with curing of plasmid, indicating that the plasmid was highly related to the degradation of phenanthrene.

从武汉石油化工厂的活性污泥中,分离到一株可以以菲为唯一碳源和能源的假单胞菌P_(12)该菌经靛蓝产生法测定有双加氧酶,在菲无机盐培养基中生长时,有3-菲酚物质积累,经检测有一条质粒带。用丝裂霉素C消除质粒后的菌落,失去了降解菲的能力,说明P_(12)对菲的降解功能是由质粒控制的。

Using the gene expression vector pF'DCll for Bacillus stearothermophilus CU21, a reco-mbinant plasmid pFDXl was constructed, which carries the Pseudomonas-derived xylE gene coding for Catechol 2,3-dioxygenase (CatOiase) CatO2ase activity can be detected from CU21 (pFDXl) cells grown at 48癈. This result indicates that the promoterless xylE gene can be-expressed in a thermophilic host under thr direction of a promoter from a thermophilic bacterium. By selecting Kmr mutants at elevated growth temperature, a segregant...

Using the gene expression vector pF'DCll for Bacillus stearothermophilus CU21, a reco-mbinant plasmid pFDXl was constructed, which carries the Pseudomonas-derived xylE gene coding for Catechol 2,3-dioxygenase (CatOiase) CatO2ase activity can be detected from CU21 (pFDXl) cells grown at 48癈. This result indicates that the promoterless xylE gene can be-expressed in a thermophilic host under thr direction of a promoter from a thermophilic bacterium. By selecting Kmr mutants at elevated growth temperature, a segregant CU21-161 was-obtained, the xylE gene expression of which at 55℃ and 60℃ was much higher than that of the parental strain. A method for CatOiase assay with suspension of intact celles was also reported in this paper.

以嗜热脂肪芽孢杆菌CU21的表达型质粒pFDC11为载体,插入来自恶臭假单孢菌的编码邻苯二酚2,3-双加氧酶(CatO_2ase)的xylE基因,构建成重组质粒pFDX1转化入CU21受体,在48℃培养时得到了表达产物,表明常温细菌的xylE基因可以在高温菌启动子的带动下在高温菌宿主中表达。采用提高培养温度后选择卡那毒素抗性突变的方法,得到了在55℃及6O℃的CatO_2ase表达量明显提高的变异菌株CU21-161。本文同时报道一种用完整细胞悬浮液测定CatO_2ase活力的方法。

 
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