超临界CO2做发泡剂制备多孔尼龙66膜的研究

超临界CO2做发泡剂制备多孔膜尼龙66,通过X射线衍射、扫描电镜和水通量的方法对膜结晶度、孔形态和水通量进行了表征.超临界CO2的作用促使膜结晶度提高,得到胞腔状开孔结构膜.     

液膜分离技术及其研究应用进展

论述了液膜分离技术的传质机理，介绍了该技术的研究现状、应用情况及发展前景。     

NF——安全饮用水生产之有效保障

针对空前匮乏的淡水资源以及日益恶化的饮用水水源水质,本文就饮用水净化与脱盐中所采用的传统工艺、工艺改进(活性炭吸附法、臭氧氧化技术、臭氧生物活性炭法)以及以压力为驱动力的膜分离技术(R0、NF、UP、MF)等的特点进行了论述,比较得出NF在饮用水制备方面具有独特的作用,是保障安全饮用水生产的有效方法.同时,指出了NF在饮用水净化中存在的问题,给出了解决问题的可行性方案.     

兔膝半月板滑膜被覆的组织学、组织化学及超微结构的研究

本文通过20支兔膝关节半月板的组织学、组织化学和特染（VG.Mal-lory,Weigert,PMF,PAS,AB,PAS-AB,Feulgen,VonKossaXiGomori等法）以及超微结构（TEM,SEM）,对被覆半月板表面的薄层组织结构性质进行研究,较有说服力地证实为滑膜组织。为长期以来认为半月板有滑膜被覆（但遭到有些学者反对）和运动医学界（含矫形外科）对半月板损伤不需作手术切除,有自行愈合可能等提供形态学理论依据。     

以PVC膜碘离子电极测定大米中碘的含量

本文报导在 0 .0 5mol/L硼砂缓冲溶液中 ,以PVC膜碘离子电极直接电位法测定大米中碘的含量 ,方法灵敏度为 3× 10 - 7mol/L ,线性范围为 5× 10 - 7～ 10 - 3mol/L ,以该方法对蒸水沿岸地方的大米中的碘测定 ,分析表明 ,该地区中碘含量处在 0 .2～ 0 .6mg/kg范围 .     

SCI在科学研究中的应用--以膜生物反应器技术为例

长期以来,SCI收录引用被用做评价科研成果的重要指标之一,但其作为权威数据库提供的检索、分析功能却未受到足够的重视。本文介绍了SCI数据库,并且以膜生物反应器技术为例说明SCI对于科研的指导意义。利用SCI提供的Analyze Results对SCI收录的705篇膜生物反应器论文进行了统汁分析,描绘了膜生物反应器的研究概貌。分析内容包括:列出了TOP2O的作者、机构和期刊,并分析了论文的年分布、学科分布、文献类型,重点分析了学科分布分析功能对科研的作用。     

陶瓷膜微滤法精制关黄柏提取液的研究

对无机陶瓷膜微滤关黄柏提取液进行研究,测定了不同操作条件对膜通量的影响,考察了膜的清洗方法,测定了有效成分盐酸小檗碱的含量．关黄柏提取液微滤前为浑浊液体,微滤后为澄明液体,有效成分转移率为63．6％．     

Effects of operative conditions on membrane fouling of jet loop membrane bioreactor

The orthogonal experiments, which involves three factors： aeration intensity, suction time and suction suspended time, were designed to research membrane fouling of jet loop membrane bioreactor （JLMBR）. Experimental results indicate that increasing aeration intensity, reducing suction time and increasing suction suspended time all could mitigate membrane fouling effectively. However excessive aeration intensity, too short suction time and excessive suction suspended time were bad for bioreactor running. The optimal aeration intensity, suction time and suction suspended time were 0.75 1.00 m3/（m2.h）, 8 -10 min and 4 -5 min, respectively. The three factors all had effect on membrane pollution rate, while the suction time was the most important one and followed by aeration intensity and suction suspended time. It also indicates that, comparing with traditional submerged membrane bioreactors, JLMBR had lower membrane pollution rate.     

Toxic effects of Litsea elliptica Blume essential oil on red blood cells of Sprague-Dawley rats

Litsea elliptica Blume leaves have been traditionally used as medicinal herbs because of its antimutagenicity, che-mopreventative and insecticidal properties. In this study, the toxic effects of L. elliptica essential oil against Sprague-Dawley rat's red blood cells (RBCs) were evaluated. L. elliptica essential oil was given by oral gavage 5 times per week for 3 treated groups in the doses of 125, 250, and 500 mg/(kg body weight), respectively, and the control group received distilled water. Full blood count, RBC osmotic fragility, RBC morphological changes, and RBC membrane lipid were analyzed 28 d after the treatment. Although L. elliptica essential oil administration had significantly different effects on hemoglobin (Hb), mean cell hemoglobin concentration (MCHC), mean cell volume (MCV), and mean cell hemoglobin (MCH) in the experimental groups as compared to the control group (P<0.05), the values were still within the normal range. L. elliptica induced morphological changes of RBC into the form of echinoeyte. The percentage of echinocyte increased significantly among the treated groups in a dose-response manner (P<0.001). The concentrations of RBC membrane phospholipids and cholesterol of all treated groups were significantly lower than those of control group (P<0.001). However, the RBC membrane osmotic fragility and total proteins of RBC membrane findings did not differ significantly between control and treated groups (P>0.05). It is concluded that structural changes in the RBC membrane due to L. elliptica essential oil administration did not cause severe membrane damage.     

Detection of plasmid-mediated IMP-1 metallo-β-lactamase and quinolone resistance determinants in an ertapenem-resistant Enterobacter cloacae isolate

Objective: To investigate the mechanism of carbapenem resistance and the occurrence of plasmid-mediated quinolone resistance determinants qnr and aac(6')-Ib-cr in a clinical isolate of Enterobacter cloacae. Methods: An ertapenem-resistant E. cloacae ZY106, which was isolated from liquor puris of a female gastric cancer patient in a Chinese hospital, was investigated. Antibiotic susceptibilities were determined by agar dilution method. Conjugation experiments, isoelectric focusing, polymerase chain reaction (PCR), and DNA sequence analyses of plasmid-mediated carbapenemases and quinolone resistance determinants were preformed to confirm the genotype. Outer membrane proteins (OMPs) were examined by urea-sodium dodecyl sulfate-polyacrylamide gel electrophoresis (Urea-SDS-PAGE). Results: Minimum inhibitory concentrations (MCs) of imipenem, mer-openem, and ertapenem for ZY106 were 2,4, and 16 ug/ml, respectively. Conjugation studies with Escherichia coli resulted in the transfer of significantly reduced carbapenem susceptibility. ZY106 produced IMP-1 metallo-p-lactamase and CTX-M-3 extended-spectrum P-lactamase, and E. coli transconjugant produced IMP-1. Plasmid-mediated quinolone resistance determinant qnrSI was detected in ZY106. Transfer of the qnrSI-encoding-plasmid into E. coli by conjugation resulted in intermediate resistance to ciprofloxacin in E. coli transconjugant. Urea-SDS-PAGE analysis of OMPs showed that ZY106 lacked an OMP of approximately 38 KDa. Conclusion: It is the first IMP-1-producing Enterobacteriaceae in China and the first report of a clinical isolate that harbors both blaIMP and qnrS genes as well. The blaIMP-1, blaCTX-M-3, and qnrSl are encoded at three different plasmids. IMP-1 combined with the loss of an OMP possibly resulted in ertapenem resistance and reduced imipenem and mero-penem susceptibility in E. cloacae.