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NaCS/PDMDAAC微囊化肺炎克雷伯氏菌发酵产1,3-丙二醇  [PDF]
陈国,陈宏文,彭益强,方柏山
华侨大学学报(自然科学版) , 2008, DOI: 10.11830/ISSN.1000-5013.2008.04.0554
Abstract: 研究一种新型的生物微胶囊体系――NaCS/PDMDAAC,包埋肺炎克雷伯氏菌(K.pneumoniaeZJU5205)产1,3-丙二醇.比较不同初始菌体包埋量、胶囊/发酵液体积、发酵液pH值、初始甘油质量浓度等对微囊化细胞发酵结果的影响.结果表明,将细胞种子液稀释5倍后包埋,当胶囊与发酵液的体积比为1∶2、初始pH值为7、初始甘油质量浓度为60g.L-1时,得到较好的发酵结果.考察肺炎克雷伯氏菌在囊内的生长曲线,以及底物和产物质量浓度随发酵时间的变化,发现由于胶囊引起的扩散限制,可以持续维持囊内较低的底物质量浓度,从而部分克服高质量浓度底物对菌体生长和生成产物的抑制.
Immobilization of Cells by Macro-porous NaCS-PDMDAAC Capsules and Cultivation in Shaking Flask and Bubble Bioreactor
大孔型NaCS-PDMDAAC微胶囊固定化细胞在摇床和鼓泡塔中的培养研究

ZHANG Jun,YAO Shan-Jing~,YING Xiao-Jiao,GUAN Yi-Xin,LIN Dong-Qiang,
张俊
,姚善泾,应小姣,关怡新,林东强

生物工程学报 , 2005,
Abstract: The membrane of sodium cellulose sulphate ( NaCS)-poly dimethyldiallylammonium chloride (PDMDAAC) microcapsule is compact and has low molecular weight cut-off, which would delay the mass transfer and affect the cell growth immobilized in the capsule. Macroporous NaCS-PDMDAAC microcapsules were prepared using the degradation of the starch by amylase in the membrane of the capsules. The pore size and the permeability in the membrane were improved obviously. As model cells, the Candida krusei CK1 and E. coli EC1 immobilized in the capsules were cultured in the shake flask and bubble column respectively. It was shown that the cell density immobilized in the microcapsules cultured in the bubble column was higher than that cultured in the shaking flask. It implied that the limiting factor of the cell growth in the capsule lied in the diffusion of the oxygen. Since the rate of the oxygen transporting across the membrane was greatly enhanced due to the enlarged pore size, the maximum cell density in the macroporous capsules was 20%-110% over than that in the standard capsules in the bubble column. However, the extent of E. coli cell density increasing was higher than that of the yeast, which may be due to the difference of the oxygen requirement between the two microbes.
大孔型nacs-pdmdaac微胶囊固定化细胞在摇床和鼓泡塔中的培养研究  [PDF]
张俊 姚善泾* 应小姣 关怡新 林东强
生物工程学报 , 2005,
Abstract: nacs-pdmdaac生物微胶囊囊膜较为致密,影响胶囊内外物质的交换,从而影响胶囊内细胞的生长。利用淀粉酶对致孔剂淀粉的降解作用制备了一种大孔型的纤维素硫酸钠_聚二甲基二烯丙基氯化铵(nacs-pdmdaac)生物微胶囊,实验表明胶囊的孔径和通透性能都有了很大的提高。将酵母和大肠杆菌作为模型细胞包埋于胶囊中分别通过摇瓶和鼓泡塔半连续培养,在鼓泡塔中胶囊内细胞的密度要高于摇床,表明氧气的传递是胶囊内好氧细胞生长的限制因素,大孔胶囊由于囊膜孔径变大,氧气的传递更为快速,在鼓泡塔中大孔型胶囊内的最大细胞密度比常规胶囊要高出20%~110%。由于对氧气的需求量的不同,大肠杆菌菌浓提高的程度要高于酵母。
On the B^1Πstate of NaCs  [PDF]
A. Grochola,W. Jastrzebski,P. Kowalczyk
Physics , 2009,
Abstract: The B^1\Pi <- X^1\Sigma^+ system of NaCs molecule is investigated experimentally by polarization labelling spectroscopy technique. The inverted perturbation approach method is used to construct the potential energy curve of the B^1\Pi state, providing accurate eigenenergies for vibrational levels v = 0 - 15.
Controlled Formation of Ultracold NaCs Molecules by Photoassociation via Adiabatic Passage  [PDF]
Xuan Li
Physics , 2010,
Abstract: We investigate the formation of ultracold NaCs molecules by photoassociation of Na and Cs atoms.
PDMDAAC-膨润土对对硝基苯酚吸附特性的研究  [PDF]
张红梅,彭先佳,栾兆坤,徐东耀
环境化学 , 2015,
Abstract: 以聚二甲基二烯丙基氯化铵(PDMDAAC)为改性剂,对天然钙基膨润土进行有机改性,比较PDMDAAC膨润土与膨润土对对硝基苯酚废水的处理性能,研究了改性剂用量以及对硝基苯酚浓度、pH值、反应时间等因素对膨润土吸附去除率的影响.结果表明PDMDAAC改性膨润土对对硝基苯酚的吸附效果比膨润土有较大提高,吸附去除率达84%;吸附后的PDMDAAC膨润土可用酸进行再生,再生后对对硝基苯酚的吸附去除率没有明显下降;PDMDAAC-膨润土对对硝基苯酚的吸附行为可用Freundlich型吸附等温线较好地进行拟合.
NaCS-PDADMAC生物微胶囊对苏云金杆菌的生物相容性  [PDF]
梅乐和,姚善泾,林东强,岑沛霖,朱自强
化工学报 , 1999,
Abstract: 介绍了一种由NaCS和PDADMAC通过界面反应而构成的新型生物微胶囊——NaCS-PDADMAC生物微胶囊.考察了NaCS、PDADMAC和NaCS-PDADMAC生物微胶囊对苏云金杆菌生长和耗糖的影响,进行了用NaCS-PDADMAC生物微胶囊固定化培养苏云金杆菌的研究,结果表明NaCS-PDADMAC生物微胶囊对微生物具有良好的生物相容性,可用于微生物的固定化培养.
Preparation and coagulation performance of composite flocculant of PFMS-PDMDAAC
PFMS-PDMDAAC复合絮凝剂的制备及其絮凝性能

Liu Zhanmeng,Jiang Jianxin,Nie Fahui,Wang Qunhui,Sun Tichang,
刘占孟
,姜建新,聂发辉,汪群慧,孙体昌

环境工程学报 , 2012,
Abstract: 以硫酸亚铁、硫酸镁和聚二甲基二烯丙基氯化铵 (PDMDAAC)为原料,制备了一种新型无机-有机复合絮凝剂PFMS-PDMDAAC,考察了碱化度、铁镁摩尔配比、有机絮凝剂与无机絮凝剂质量比(D/FM)和废水pH等对絮凝剂絮凝性能的影响,并应用于实际印染废水的处理。实验结果表明,PFMS-PDMDAAC在较宽的pH 范围内有着良好的脱色性能,两者复配呈现出显著的协同作用,絮凝效果明显提高。在PFMS中引入PDMDAAC后,絮凝剂的Fe(Ⅲ)的优势形态含量增加;同时絮凝剂水解产物的Zeta电位亦明显升高,电中和能力增强。
PDMDAAC/AM在涤纶织物上的抗静电性能  [PDF]
刘晓云,王晓芳,周岚
纺织学报 , 2012,
Abstract: 研究二甲基二烯丙基氯化铵/丙烯酰胺共聚物(PDMDAAC/AM)在涤纶上抗静电性能。采用烘干和焙烘两种整理工艺对涤纶织物进行处理,进一步运用接触角测试仪、扫描电镜、X射线光电子能谱对其处理前后表面结构进行研究。实验结果表明PDMDAAC/AM在涤纶织物上具有很好的抗静电性能,并且表现出良好的耐洗性。良好的抗静电性能主要来源于聚合物在涤纶织物表面的附着。研究还发现两种工艺整理后,织物的抗静电性能和手感有一定的差异,主要是因为PDMDAAC/AM在高温焙烘下产生交联。
PDMDAAC系列絮凝剂的脱色性能研究  [PDF]
赵华章,栾兆坤,岳钦艳,高宝玉
环境化学 , 2015,
Abstract: 研究了二甲基二烯丙基氯化铵聚合物(PDMDAAC)系列絮凝剂对活性染料废水和分散染料废水的脱色效果,考察了絮凝剂的特性粘度、阳离子度及结构等因素对脱色效果的影响,探讨了其脱色机理,并试验了与PAC复配的脱色效果.实验结果表明絮凝剂的特性粘度越高,阳离子度越高,脱色效果越好;絮凝剂结构中引入乙烯基三甲氧基硅烷(VTMS)可使脱色效果有所提高;PDMDAAC系列絮凝剂处理活性染料废水的机理是通过电中和作用,使染料分子从水中析出,然后通过吸附架桥作用使之聚集、沉降除去;PDMDAAC系列絮凝剂在处理分散染料废水时,吸附架桥为主导作用;PDMDAAC系列絮凝剂与PAC复配可使脱色效果更佳而且可以降低处理成本.
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