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对饮用天然矿泉水标准中的微生物指标的修订、发展趋势、意义及检验方法进行综述,并对梅州市附近10处饮用天然矿泉水水源采样进行了微生物指标检测及评述.按《饮用天然矿泉水检验方法》(GB/T8538-2008)对水样中的大肠菌群、粪链球菌、铜绿假单胞菌、产气荚膜梭菌四个指标进行检验,并按《饮用天然矿泉水》(GB8537-2008)进行评价.结果表明,所测水样中大肠菌群严重超标,粪链球菌、铜绿假单胞菌、产气荚膜梭菌均有1处超标,其它微生物指标达标.为了确保饮用天然矿泉水的质量,应加强水源的卫生监督管理. 相似文献
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为研究滴水观音对铜绿微囊藻、针杆藻的化感作用,利用根、茎、叶不同器官浸出液,测定对藻类叶绿素a含量的影响.结果表明：根浸出液对实验藻表现为低浓度促进、高浓度抑制作用;叶浸出液对实验藻均表现为化感抑制作用,叶浸出液的化感抑制能力高于根浸出液,对铜绿微囊藻的化感抑制随着浓度的增加逐渐的增强,第18d、叶片浸出液浓度为10g/L时,对微囊藻和针杆藻的抑制率分别为93％和58％;茎浸出液的化感作用对藻类表现为促进作用,且对微囊藻的化感促进效果强于针杆藻. 相似文献
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ZHU Yong GAN Jun-jiang ZHANG Guo-liang YAO Bin ZHU Wen-jie MENG Qin 《浙江大学学报(A卷英文版)》2007,8(9):1514-1520
In this work,rhamnolipid production was investigated using waste frying oil as the sole carbon source. By culture in shaking flasks,a naturally isolated strain synthesized rhamnolipid at concentration of 12.47 g/L and its mutant after treatment by UV light increased this productivity to 24.61 g/L. Fermentation was also conducted in a 50 L bioreactor and the productivity reached over 20 g/L. Hence,with a stable and high productive mutant strain,it could be feasible to reuse waste frying oil for rhamnolipid production on industrial scale. 相似文献
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Biodegradation of crude oil by Pseudomonas aeruginosa in the presence of rhamnolipids 总被引：3，自引：0，他引：3
INTRODUCTION Oily wastewater, especially from oil field, hasposed a great hazard for terrestrial and marine eco-systems. The traditional treatment of oily wastewater,such as containment and collection using floatingbooms, adsorption by natural or synthetic materials,etc., can not degrade the crude oil thoroughly (Ollis,1992). So far, biodegradation suggests an effectivemethod. During biodegradation, crude oil is used asan organic carbon source by a microbial process,resulting in the brea… 相似文献
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Microcystis aeruginosa FACHB 905 was used as a model organism to study the effects of small water clusters(SWCs) on the growth and microcystin(MC) production of toxic cyanobacteria.The results showed that SWCs were able to stimulate the growth of Microcystis aeruginosa,which resulted in increased cell numbers and higher specific growth rates after a 30-d treatment.The cell morphology indicated that Microcystis aeruginosa was in a better state of growth,and it was more prone to divide in SWCs than in normal water clusters.The SWCs treatment up-regulated MC synthesis and exudation in 10 d in Microcystis aeruginosa,and the intra-cellular MC content decreased after the 20th day subsequently.Moreover,the cellular photosynthetic pigment contents were temporarily stimulated by SWCs.A possible reason is that SWCs stimulated the growth by promoting photosynthesis,whereas the increased MC production was relevant to pigment contents. 相似文献
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目的：了解大肠埃希菌、肺炎克雷伯菌、铜绿假单胞菌和鲍曼不动杆菌感染现状和对常用抗菌药物耐药趋势。方法：应用VITET-2Compact全自动微生物分析仪进行细菌鉴定,K—B纸片扩散法进行药敏试验。结果：4种革兰阴性杆菌对青霉素类、磺胺类、喹诺酮类、阿莫西林／棒酸、庆大霉素、头孢类、氨曲南耐药率分别为75％、75％、20％、70％、55％、50％、13％,而铜绿假单胞杆菌对头孢他啶（7．22％）和头孢吡肟（11．86％）较为敏感。大肠埃希菌和肺炎克雷伯杆菌均对碳青霉烯类和头孢哌酮／舒巴坦敏感,铜绿假单胞杆菌对其全部耐药,鲍曼不动杆菌仅对亚胺培南、头孢哌酮／舒巴坦敏感。大肠埃希菌和铜绿假单胞杆菌对阿米卡星敏感,肺炎克雷伯杆菌对哌拉西林／他唑巴坦敏感,其它菌耐药率都超过14％。结论：大肠埃希菌、肺炎克雷伯菌、铜绿假单胞菌和鲍曼不动杆菌对常用抗生素耐药率高;医院检验科应加强细菌感染控制和耐药监测,指导临床合理使用抗生素。 相似文献
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目的通过在体外复制铜绿假单胞菌（P．a）的生物膜模型,研究盐酸氨溴索与阿米卡星对铜绿假单胞菌生物膜的影响。方法以聚氯乙烯吸痰管作为生物膜载体制作铜绿假单胞菌体外生物膜模型,分别在生物膜形成的不同时间加入3MIC的阿米卡星及不同浓度的盐酸氨溴索,采用连续稀释法进行生物膜内存活菌菌落计数。结果与单独应用阿米卡星组相比,阿米卡星与盐酸氨溴索合用后,生物膜中的活菌数明显减少。成熟生物膜中的活菌数随盐酸氨溴索浓度的增高而减少。结论盐酸氨溴索能增强阿米卡星对生物膜内铜绿假单胞菌的清除作用。 相似文献
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通过对湿地水体水样中惠氏微囊藻、铜绿微囊藻和绿色微囊藻的培养,检测经湿地净化后水体和湿地外周水体中微囊藻数量变化．比较得知,经湿地净化水样中的蓝藻细胞总数的上升趋势明显低于湿地外周水样．3种微囊藻的繁殖速度,在湿地外周水样中为：铜绿微囊藻〉〉惠氏微囊藻〉绿色微囊藻,铜绿微囊藻为优势种群;在经湿地净化水样中为：惠氏微囊藻≈铜绿微囊藻〉绿色微囊藻,3种微囊藻的比例与培养前相同,且优势藻群并非微囊藻类．结果表明,湿地能有效改变微囊藻的繁殖速率和水体中藻类的优势种群,明显抑制水体中的蓝藻数量,达到净化水质的目的． 相似文献
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