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综述了不依赖于培养的分子生物学方法变性梯度凝胶电泳的原理、步骤、优点以及变性梯度凝胶电脉的不是及解决方法。对变性梯度凝胶电脉在环境微生物,动物肠道的多样性及微生物菌群动态变化及前景进行了研究和阐述,并指出了变性梯度凝胶电泳具有良好的发展前景。 相似文献
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综述了不依赖于培养的分子生物学方法变性梯度凝胶电泳的原理、步骤、优点以及变性梯度凝胶电脉的不是及解决方法.对变性梯度凝胶电脉在环境微生物,动物肠道的多样性及微生物菌群动态变化及前景进行了研究和阐述,并指出了变性梯度凝胶电泳具有良好的发展前景. 相似文献
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变性梯度凝胶电(Denaturing Gradient Gel Electrophoresis,DGGE)术是通过直接分离核酸片段对微生物群落进行研究,由于其具有可靠性强、重复性好、方便快捷等优点.被广泛应用于微生物群落多样性和动态性分析,并成为微生物分子生态学研究中的热点技术之一.本文主要介绍DGGE技术的原理、工作流程及优缺点.并着重分析了其在动物胃肠道微生态研究中的应用. 相似文献
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《The Journal of Applied Poultry Research》2007,16(4):563-573
Diversity of the bacterial communities in the ileum of broilers was characterized using denaturing gradient gel electrophoresis. Denaturing gradient gel electrophoresis separation of polymerase chain reaction amplicons of the V2–V3 variable regions of the 16S rDNA is a common method to profile community diversity and has been used to assess the effects of diet and antibiotics on the ileal bacterial community of chickens. Broilers raised either on litter floor or in cage batteries were fed either a finely ground corn- (control), a finely ground triticale-, or a whole triticale-based diet from 0 to 42 d. Microbial DNA was extracted from the ileum content of 42-d-old broilers, and the 16S rDNA gene was amplified by polymerase chain reaction and the amplicons separated by denaturing gradient gel electrophoresis. Diversity indexes including richness, evenness, diversity, and pairwise similarity coefficients were calculated. Diversity indexes were related to the dietary treatments, housing designs, and to changes in Salmonella colonization of broiler ceca as characterized by the most probable number method. Higher microbial diversity indexes were observed among birds fed whole triticale-based diets and reared on litter floors. In contrast, finely ground grain treatments had lower diversity and higher Salmonella prevalence than the whole triticale treatment. The data indicated that combination of high dietary fiber content and increased coarseness of the diet by feeding whole triticale stimulated microbial community diversity and discouraged Salmonella colonization, perhaps through a competitive exclusion-type mechanism. 相似文献
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Bech-Nielsen GV Hansen CH Hufeldt MR Nielsen DS Aasted B Vogensen FK Midtvedt T Hansen AK 《Research in veterinary science》2012,92(3):501-508
Inflammatory diseases such as type 2 diabetes (T2D) in humans and mice are under the influence of the composition of the gut microbiota (GM). It was previously demonstrated that treating Lep(ob) mice with antibiotics improved glucose tolerance. However, wild type C57BL/6J mice may also exhibit plasma glucose intolerance reminiscent of human T2D. We hypothesized that antibiotic treatment in C57BL/6 mice would have an impact on glucose tolerance without affecting weight and gut immunology. When compared to mice treated with erythromycin or the controls, treatment for five weeks with ampicillin improved glucose tolerance without significantly affecting the weight or the number of gut mucosal regulatory T cells, tolerogenic dendritic cells or T helper cells type 1. 16S rRNA gene based denaturing gradient gel electrophoresis profiles clearly clustered according to treatment and showed that antibiotic treatment reduced GM diversity. It is concluded that antibiotic treatment changes glucose metabolism as well as the composition of the GM in C57BL/6 mice, and that this does not seem to be correlated to weight development in the mice. 相似文献
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Fermentation and microbial population dynamics during the ensiling of native grass and subsequent exposure to air
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To study the microbial population and fermentation dynamics of large needlegrass (LN) and Chinese leymus (CL) during ensiling and subsequent exposure to air, silages were sampled and analyzed using culture‐based techniques and denaturing gradient gel electrophoresis (DGGE). A total of 112 lactic acid bacteria (LAB) strains were isolated and identified using the 16S rRNA sequencing method. Lactic acid was not detected in the first 20 days in LN silage and the pH decreased to 6.13 after 45 days of ensiling. The temperature of the LN silage increased after approximately 30 h of air exposure and the CL silage showed a slight temperature variation. Enterococcus spp. were mainly present in LN silage. The proportion of Lactobacillus brevis in CL silage increased after exposure to air. LN silage with a higher proportion of Enterococcus spp. and propionic acid concentration did not show higher fermentation quality or aerobic stability than CL silage, which had a higher concentration of acetic acid, butyric acid and increased proportion of L. brevis after exposure to air. 相似文献
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日粮中添加茶皂素和豆油对羔羊瘤胃细菌区系的影响 总被引:1,自引:0,他引:1
研究茶皂素和豆油对羔羊瘤胃细菌区系的影响。选16只健康断奶湖羊,随机分入对照、茶皂素(TS)、豆油(SO)、茶皂素和豆油混合添加组(TS-SO)。饲喂60 d后屠宰取瘤胃液,进行变性梯度凝胶电泳(DGGE)分析。结果表明:日粮中添加TS和SO对瘤胃细菌区系有一定的影响,TS-SO组细菌多样性增加,但各组间DGGE条带数差异不显著(P0.05)。切胶、测序分析图谱中4个特异条带分属于苍白杆菌、不动菌、葡萄球菌和甲基杆菌属,相似性均达99%以上。表明日粮中添加茶皂素和豆油可以一定程度改变羔羊瘤胃细菌区系,但对细菌多样性影响不显著。 相似文献
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应用PCR-DGGE分析鸭场土壤细菌群落结构 总被引:1,自引:1,他引:0
为了解贵州省三穗县8个养鸭场环境土壤中细菌群落结构多样性概况,本试验采用试剂盒提取土壤样品细菌总DNA,PCR扩增细菌16S rDNA V3可变区,并通过变性梯度凝胶电泳(DGGE)技术对扩增产物进行凝胶分离,回收测序共得到43条特异性条带,其中7、8号养鸭场条带数相对较少.DGGE图谱经Quantity One软件分析,结果显示,同一鸭场样品相似性存在差异,绝大部分鸭场样品间相似性均高于50%,所测序列与GenBank中相应原核生物16S rDNA序列经同源性比对可见相似性在90%~100%之间,共包括5个大纲的细菌种类:变形菌门(Proteobacteria)的α,β类群、拟杆菌门(Bacteroidetes)、放线菌门(Actinobacteria)、酸杆菌门(Acidobacteria)和厚壁菌门(Firmicutes). 相似文献