Thiobacillus ferrooxidans is a extremely acidophilic and obligately chemlithotrophic bacterium. It is the most important work for gene engineering of T.ferrooxidans to develop an efficient gene transfer systems. This ...Thiobacillus ferrooxidans is a extremely acidophilic and obligately chemlithotrophic bacterium. It is the most important work for gene engineering of T.ferrooxidans to develop an efficient gene transfer systems. This paper summarized the genetics background of T.ferrooxidans, the process of establishing such a kind of gene transfer system, and its application in constructing arsenic resistance genetically engineered bacteria. Ref展开更多
文摘Thiobacillus ferrooxidans is a extremely acidophilic and obligately chemlithotrophic bacterium. It is the most important work for gene engineering of T.ferrooxidans to develop an efficient gene transfer systems. This paper summarized the genetics background of T.ferrooxidans, the process of establishing such a kind of gene transfer system, and its application in constructing arsenic resistance genetically engineered bacteria. Ref
文摘目的评估瑞马唑仑全凭静脉麻醉(TIVA)下患者的外显记忆和内隐记忆,并观察皮质醇浓度。方法选择择期行全麻患者60例,男31例,女29例,年龄18~60岁,BMI 16~30 kg/m^(2),ASAⅠ—Ⅲ级。行BIS监测,维持BIS 40~60。根据听录音内容的不同,通过随机数字表法将患者分为三组:类别组(CT组)、单词组(WM组)和对照组(CG组),每组20例。CT组听五个中频动物词语,WM组听五个中频单词,CG组听大海声。术后1 h,在麻醉恢复室(PACU)对患者进行外显记忆和内隐记忆的评估。外显记忆评估,每组提问以下问题:(1)是否记得手术过程中的任何事情?(2)是否做梦?内隐记忆评估分组提问:(1)CT组行类别评估测试:请说出最先想到的5个动物名;(2)WM组行单词再认测试:请在10个中频词(其中5个在术中播放过)中选出近期听过的词。(3)CG组:提问前两组的所有问题,以获得基础值进行比较。于入室后、听录音20 min、术后1 h抽取静脉血,测定皮质醇。结果三组均报告不记得术中事件,CT组记得做梦2例,CG组记得做梦1例,三组差异无统计学意义。CT组和CG组类别评估测试差异无统计学意义。WM组和CG组单词再认测试差异无统计学意义。与入室后比较,听录音20 min CT组、WM组和CG组皮质醇明显降低(P<0.05),术后1 h CT组和WM组皮质醇明显升高(P<0.05)。与听录音20 min比较,术后1 h CT组、WM组和CG组皮质醇明显升高(P<0.05)。不同时点三组皮质醇差异无统计学意义。结论瑞马唑仑行全凭静脉麻醉时,BIS监测维持合适的麻醉深度下,未发现患者形成外显记忆或内隐记忆,术中皮质醇降低。