英语论文网

留学生硕士论文 英国论文 日语论文 澳洲论文 Turnitin剽窃检测 英语论文发表 留学中国 欧美文学特区 论文寄售中心 论文翻译中心 我要定制

Bussiness ManagementMBAstrategyHuman ResourceMarketingHospitalityE-commerceInternational Tradingproject managementmedia managementLogisticsFinanceAccountingadvertisingLawBusiness LawEducationEconomicsBusiness Reportbusiness planresearch proposal

英语论文题目英语教学英语论文商务英语英语论文格式商务英语翻译广告英语商务英语商务英语教学英语翻译论文英美文学英语语言学文化交流中西方文化差异英语论文范文英语论文开题报告初中英语教学英语论文文献综述英语论文参考文献

ResumeRecommendation LetterMotivation LetterPSapplication letterMBA essayBusiness Letteradmission letter Offer letter

澳大利亚论文英国论文加拿大论文芬兰论文瑞典论文澳洲论文新西兰论文法国论文香港论文挪威论文美国论文泰国论文马来西亚论文台湾论文新加坡论文荷兰论文南非论文西班牙论文爱尔兰论文

小学英语教学初中英语教学英语语法高中英语教学大学英语教学听力口语英语阅读英语词汇学英语素质教育英语教育毕业英语教学法

英语论文开题报告英语毕业论文写作指导英语论文写作笔记handbook英语论文提纲英语论文参考文献英语论文文献综述Research Proposal代写留学论文代写留学作业代写Essay论文英语摘要英语论文任务书英语论文格式专业名词turnitin抄袭检查

temcet听力雅思考试托福考试GMATGRE职称英语理工卫生职称英语综合职称英语职称英语

经贸英语论文题目旅游英语论文题目大学英语论文题目中学英语论文题目小学英语论文题目英语文学论文题目英语教学论文题目英语语言学论文题目委婉语论文题目商务英语论文题目最新英语论文题目英语翻译论文题目英语跨文化论文题目

日本文学日本语言学商务日语日本历史日本经济怎样写日语论文日语论文写作格式日语教学日本社会文化日语开题报告日语论文选题

职称英语理工完形填空历年试题模拟试题补全短文概括大意词汇指导阅读理解例题习题卫生职称英语词汇指导完形填空概括大意历年试题阅读理解补全短文模拟试题例题习题综合职称英语完形填空历年试题模拟试题例题习题词汇指导阅读理解补全短文概括大意

商务英语翻译论文广告英语商务英语商务英语教学

无忧论文网

联系方式

留学生论文写作指导范文:论益生菌对于健康的作用和影响

论文作者:www.51lunwen.org论文属性:硕士毕业论文 dissertation登出时间:2014-08-12编辑:felicia点击率:13300

论文字数:6575论文编号:org201408072157451900语种:英语 English地区:中国价格:免费论文

关键词:益生菌微生物胃肠蠕动probioticsmicroorganisms

摘要:本文是一篇英国留学论文。“益生菌”这个术语出现于20世纪50年代,被定义为活的微生物,带来了巨大的健康效益。益生菌能够减少肠道致病细菌和有害代谢物,促进胃肠蠕动规范化,加快免疫调节。本文简要分析了益生菌对于健康的重要作用。

前言

在过去的几年里,健康促进益生菌的效果已经从消费者和生产者那里得到了越来越多的注意力(de Vrese和Schrezenmeir 2008)。“益生菌”这个术语出现于20世纪50年代(Kollath,1953),被定义为活的微生物,带来了巨大的健康效益(粮农组织/世卫组织工作小组报告,2002)。益生菌的有利影响包括减少肠道致病细菌和有害代谢物,促进胃肠蠕动规范化,加快免疫调节。益生菌不仅影响肠道菌群大肠,也影响其他器官的调节免疫系统,肠道通透性,并且提供生物活性(de Vrese Schrezenmeir,2008)。


益生菌微生物的作用机制及其有效性取决于他们的交互与特定免疫感受态肠粘膜细胞。各种益生菌菌株已被证明具有多种健康益处,包括结肠的重建和肠道微生物的平衡。益生菌菌株的平衡通过减少肠道pH值,生产杀菌产品,有机酸、过氧化氢等(Saikali et al,2004;弗里克,2002;德鲁斯和卡坦,2000)。


Introduction

Health promoting effects of probiotics have gained increasing attention from consumers and producers over the past few decades (de Vrese and Schrezenmeir 2008). The term “probiotic“ was coined in the 1950s (Kollath, 1953) and has been defined as live microorganisms that when administered in adequate amounts confer a health benefit on the host (Report of a Joint FAO/WHO Working Group, 2002). Beneficial effects of probiotic bacteria include a reduction in gut pathogenic bacteria and harmful metabolites, gastrointestinal motility normalization, and immunomodulation. Probiotics not only affect the intestinal flora in the large intestine but also influence other organs by modulating the immune system, intestinal permeability and providing bioactives (de Vrese and Schrezenmeir, 2008).


The mechanism of action of probiotic microorganisms and their efficacy depend on their interactions with specific immuno-competent cells of the intestinal mucosa. Various probiotic strains have been shown to possess a wide range of health benefits including the re-establishment of colonic and intestinal microbiotic balance.The balance in this microbiotica is attained by reducing the intestinal pH and producing bactericidal products, organic acids and hydrogen peroxide (Saikali et al., 2004; Fric, 2002; De roos and Katan 2000).


The presence of probiotics in the intestine stimulates intestinal motility, increases the production of mucus, short chain fatty acids, and amino acids and strengthens the barrier function of intestinal mucosa. Increases in the number of beneficial bacteria in the intestine results in competition with pathogenic bacteria for nutrients, and thus survival (Gill et al., 2001; Mangell et al., 2002; Jain et al., 2004).


Probiotics have been shown to possess strong therapeutic effect against diarrhea and inflammatory bowel disease (De Vrese and Marteau 2007; Peran et al., 2007, 2006). In humans and animals, bacteria of the Lactobacillus (L.) strain exist as general components of the intestinal microflora (Naidu et al., 1999) and have been shown to possess bile salt hydrolase enzyme (De Smet et al., 1994), which is responsible for deconjugation of bile salt in enterohepatic circulation.


Among the various probiotic strains, L. reuteri and L. fermentum have been shown with promising health benefits. L. fermentum have been demonstrated to be capable of adhering to the epithelial cells in the small intestine and colonized (Henriksson et al., 1991; Reid et al., 2001; Rojas et al., 2002). In addition, L. fermentum possess strong resistance to low pH as well as bile salts and also prevent adhesion of uropathogenic bacteria by producing surface-active components (Heinemann et al., 2000). In an in vitr论文英语论文网提供整理,提供论文代写英语论文代写代写论文代写英语论文代写留学生论文代写英文论文留学生论文代写相关核心关键词搜索。

共 1/13 页首页上一页1234567下一页尾页

英国英国 澳大利亚澳大利亚 美国美国 加拿大加拿大 新西兰新西兰 新加坡新加坡 香港香港 日本日本 韩国韩国 法国法国 德国德国 爱尔兰爱尔兰 瑞士瑞士 荷兰荷兰 俄罗斯俄罗斯 西班牙西班牙 马来西亚马来西亚 南非南非