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Experiment data of HCB desorption were simulated better by fast2slow two stage first2order kinetics model and dynamic parameters of HCB desorption were also calculated. Frap and Fslow , the fractions of contaminant present in the rapidly and slowly desorbing sediment compartment , were respectively 3716 % and 6214 %; krap and kslow , the rate constants of rapid and slow desorption , were 01066 9h - 1 and 01000 5h - 1 , respectively.

快、慢2 段一级动力学模型较好地拟合了六氯苯释放的实验数据,并得出了释放动力学参数:快速和慢速释放部分所占的质量分率Frap , Fslow分别为3716 %和6214 %;快速和慢速释放速率常数krap , kslow分别为01066 9h - 1和

Fumed-silica surfaces were modified with resorcinol and hexamethylenetetramine complex, and NR/M-silica nanocomposites were prepared in mixing and curing process. Structure and properties of NR/M-silica nanocomposites were investigated by mechanical testing ,cross-linking density determination, transmission electron microscopy, differential scanning calorimetry, fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. The results showed that M-silica have obvious reinforcement effect on NR vulcanizate.

用间苯二酚与六亚甲基四胺络合物对气相法白炭黑进行表面改性,通过混炼和硫化制备了天然橡胶/改性气相法白炭黑(NR/M-silica)纳米复合材料,并通过力学性能测试、交联密度测定、透射电镜、差示扫描量热法、红外光谱和X射线光电子能谱等手段研究了纳米复合材料的结构和性能。

The comparisons of biochemistry between OP and OR rats The differences between OP and OR rats included not only body weight, but lipids metabolism and insulin sensitivity as well, characterized with insulin resistance, increasing in serum free fatty acids and ketone body, and hepatic TC and TG in OP rats. However, no significant differences were observed in serum TG, TC, LDL, HDL and fasting glucose between OP and OR rats.⑶Comparisons of metabolites in serum, urine and liver tissue between OP and OR rats①There were significant differences in amino acids concentration between OP and OR rats,especially in liver tissue, such as high concentrations in ketogenic and glucogenic amino acids in OP rats, suggesting differences in amino acids metabolism;② The different metabolites between OP and OR rats included increasing of various saturated fatty acids and decreasing of polyunsaturated fatty acids in OP rats;③The urinary metabolites analysis indicated that different structure or metabolism of gut microflora might exist between the two phenotypes, which probably influenced the regulation of body weight gain;④The end-products of catecholamines in urine and intermediates of krebs cycle in serum in OP rats were all up-regulated, suggesting that the activity of sympatheic nervous system and energy metabolism was higher in OP rats than OR rats.

胰岛素耐受实验和胰岛素敏感指数表明OP动物的胰岛素敏感性较OR动物下降,而OP大鼠血清中游离脂肪酸、酮体、肝脏总胆固醇和甘油三酯水平显著升高;但是,OP与OR大鼠血清中总胆固醇、甘油三酯、低密度脂蛋白、高密度脂蛋白和空腹血糖等的水平并无显著性差异;⑶肥胖易感与肥胖抵抗大鼠血清、尿液和肝脏组织提取物中代谢物的比较研究表明:①OP与OR大鼠的血清、尿液和肝组织提取物中多种氨基酸的含量存在显著差异,并以肝组织中的差异氨基酸数量为最多,包括各种生酮和生糖氨基酸水平在OP组的升高,说明氨基酸代谢的差异是两种体重表型大鼠之间存在的重要差异特征之一;②OP与OR动物肝脏和血清差异代谢物中包含多种饱和长链脂肪酸的升高如十四烷酸、十六烷酸、硬脂酸等和多不饱和脂肪酸的下降如亚油酸和花生四烯酸,说明两种体重表型动物的肝脏脂肪酸代谢存在明显差异;③长期高脂饮食喂养后,动物的尿液代谢物分析表明OP与OR动物体内的肠道菌群结构存在差异,这些菌群上的差别可能在动物体重增长的调节上产生影响;④与OR动物相比,OP动物尿液代谢物中儿茶酚胺类递质的代谢终产物如高香草酸、扁桃酸和4-羟基苯乙酸明显升高。

In this study, six patients with piebaldism had removal of achromic epidermis via appropriately set erbium:YAG laser followed by application of autologous cultured epidermal grafts on the recipient bed. The 3,4-dihydroxyphenylalanine reaction was used to determine melanocyte content, and a semiautomatic image analysis system calculated the percentage of repigmentation.

在这项研究中,六名通过适当能量设定之铒-雅克雷射,移除色素缺乏表皮的白斑病患,在受体皮肤上以自体培养表皮移植的应用加以追踪。3.4-羟基苯丙胺酸反应用以测定黑色素细胞内容,并以半自动影像分析系统计算再色素沉淀的百分比。

In medium of mixed sulphuric acid and phosphoric acid, with N-phenylated anthranilic acid as a tracer agent, the standard solution of ammonium ferrous sulphate is used to titrate chromium.

试样以硝酸、氢氟酸溶解,加高氯酸冒烟驱除硅和氟,并将铬氧化为六价,在硫磷混合酸介质中,以N-苯代邻氨基苯甲酸为指示剂,用硫酸亚铁铵标准溶液滴定铬。

A suspension of carbon nanotubes as a nanofluids was prepared by dispersing carbon nanotubes into deionized water. The effects of several typical kinds of surfactants such as sodium dodecyl benzene sulfonate, hexadecyl trimethyl ammonium bromide and emulsifying agent OP on the stability of the nanofluid were studied by stationary and centrifugal tests with sample morphologies characterized by SEM and TEM.

在水中加入碳纳米管制备了含碳纳米管悬浮液,研究了几种典型类型的表面活性剂:十二烷基苯磺酸钠、十六烷基三甲基溴化铵及乳化剂OP对纳米流体稳定性的影响,通过静置和离心分离等手段研究了其稳定性,并采用扫描电子显微镜和透射电子显微镜对样品的形貌进行了表征。

This paper studied four pretreatment methods by adding three different retention time organochlorine pesticides(α-BHC、Dieldrin、pp′-DDT) to fish sample and making different concentration(0.01、0.1、1),then using GC-ECD determinate its recoveries.

研究了用气相色谱——电子捕俘器法测定鱼肉中有机氯农药的四种不同前处理方法。通过向鱼样中加入三种不同保留时间的有机氯农药(α—六氯苯、狄氏剂、滴滴涕),并测定三种不同浓度(0.01、0.1、1)时加标回收率。

Tris-(1-aziridinyl)- phosphine oxide and 2-[bis-(2-chloroethyl)-amino]-tetrahydro-1, 3, 2-oxazaphospholidine-2-oxide(Ⅲ, B-518) possess inhibitory action against a variety of animal tumours and have been used clinically. Recently, bis-(1-aziridinyl)-phosphinyl carbamic acid ethyl ester(Ⅱ, AB-100) was found to possess significant activity with low toxicity on experimental animal tumours.

双(2-氯乙基)氨基磷酰二氯与乙烯亚胺在脱水苯或对氧六环中并在三乙胺的存在下进行缩合,生成N,N-双(2-氯乙基)-N′,N-二乙烯基-磷酰胺;与双巯基或双氨基化合物作用,则生成相应的环状磷酰胺、磷酰胺酯以及磷酰胺硫代酯氮芥类化合物。

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