异化铁还原菌具有独特的胞外电子传递功能,直接影响多种元素的生物化学地球循环。在自然环境中,微生物常被吸附于矿物表面形成生物被膜,并以此方式与矿物相互作用。为了利用不同含铁矿物以适应环境多样性,微生物进化出了由c型细胞色素...异化铁还原菌具有独特的胞外电子传递功能,直接影响多种元素的生物化学地球循环。在自然环境中,微生物常被吸附于矿物表面形成生物被膜,并以此方式与矿物相互作用。为了利用不同含铁矿物以适应环境多样性,微生物进化出了由c型细胞色素组成的多种胞外电子传递途径。微生物如何调节胞外电子传递网络是一个重要问题。近年来相关研究表明,环二鸟苷酸(c-di-GMP)和环鸟苷腺苷酸(c-di-GAMP)在调节Geobacter spp.等异化铁还原菌的胞外电子传递(extracellular electron transfer,EET)中发挥着重要的作用。以异化铁还原菌模式菌株(地杆菌属)为例,首先介绍了其胞外电子传递机制;其次介绍了地杆菌生物被膜的形成及其胞外基质;最后介绍了环二核苷酸信号分子对胞外电子传递过程中的调控作用。此外,综述了环二核苷酸信号分子对地杆菌的调控作用在环境、能源领域中的应用。展开更多
Intestinal flora of 47 Apriona germari(Hope) larvae,collected from fields,had been isolated and identified.The results showed that the predominant bacteria were Staphylococcus.Its viable count was 7.63±0.21,and t...Intestinal flora of 47 Apriona germari(Hope) larvae,collected from fields,had been isolated and identified.The results showed that the predominant bacteria were Staphylococcus.Its viable count was 7.63±0.21,and the detection rate was 100%.Meanwhile,a strain of cellulose-utilizing bacterium was isolated from the fore-midgut fluid of A.germari larvae with the cellulose-congo red agar medium.The bacterium was tentatively identified as Cellulomonas.The detection rate of the cellulolytic bacterium was 23.40%,and the count was 3.84±0.54 approximately.Its contribution to the borer′s cellulose digestion needs further investigations.展开更多
文摘异化铁还原菌具有独特的胞外电子传递功能,直接影响多种元素的生物化学地球循环。在自然环境中,微生物常被吸附于矿物表面形成生物被膜,并以此方式与矿物相互作用。为了利用不同含铁矿物以适应环境多样性,微生物进化出了由c型细胞色素组成的多种胞外电子传递途径。微生物如何调节胞外电子传递网络是一个重要问题。近年来相关研究表明,环二鸟苷酸(c-di-GMP)和环鸟苷腺苷酸(c-di-GAMP)在调节Geobacter spp.等异化铁还原菌的胞外电子传递(extracellular electron transfer,EET)中发挥着重要的作用。以异化铁还原菌模式菌株(地杆菌属)为例,首先介绍了其胞外电子传递机制;其次介绍了地杆菌生物被膜的形成及其胞外基质;最后介绍了环二核苷酸信号分子对胞外电子传递过程中的调控作用。此外,综述了环二核苷酸信号分子对地杆菌的调控作用在环境、能源领域中的应用。
文摘Intestinal flora of 47 Apriona germari(Hope) larvae,collected from fields,had been isolated and identified.The results showed that the predominant bacteria were Staphylococcus.Its viable count was 7.63±0.21,and the detection rate was 100%.Meanwhile,a strain of cellulose-utilizing bacterium was isolated from the fore-midgut fluid of A.germari larvae with the cellulose-congo red agar medium.The bacterium was tentatively identified as Cellulomonas.The detection rate of the cellulolytic bacterium was 23.40%,and the count was 3.84±0.54 approximately.Its contribution to the borer′s cellulose digestion needs further investigations.
文摘从养殖病死三疣梭子蟹肝胰脏及心脏血淋巴液中分离到大量优势生长的细菌,人工感染试验证明分离菌对三疣梭子蟹有较强的致病性;对分离菌进行了形态特征、理化特性、胞外酶及溶血素活性等表型生物学性状及16S rRNA和gyrB两种基因的分子鉴定。菌株(JGX080708-1)所扩增的16S rRNA基因序列长度为1453bp(GenBank登录号:FJ824663),所扩增的gyrB基因序列长度为1191bp(GenBank登录号:GQ372985);两种基因序列在NCBI通过blast检索,结果均与弧菌属细菌的基因序列自然聚类;根据分离菌的表型及分子特征,判定分离菌为弧菌属(Vibrio Pacini1954)的副溶血弧菌[Vibrio parahaemolyticus(Fujino et al1951)Sakazaki Nakamura and Takizawa1963]。分离菌的药敏试验结果显示,对供试49种抗菌药物中的安曲南等42种药物高度敏感,对林可霉素敏感,对青霉素G等6种药物耐药。
