阿魏蘑液体发酵过程菌体形态变化对产漆酶的影响

本文旨在研究阿魏蘑菌体形态与漆酶产量之间的关系。结果显示,玻璃珠的添加可改变发酵过程中菌体形态,漆酶产量在球状菌体条件下高于丝状、絮状菌丝：直径分布在0.2~0.4 mm范围的菌球对漆酶的合成具有明显的促进作用;适合的葡萄糖、玉米粉和麸皮添加量,对直径在0.2~0.4 mm范围的菌球形成具有重要影响。此外,添加惰性载体同样可以控制菌球的直径分布,但对漆酶的合成无促进作用。     

中国傣族、景颇族人群中与艾滋病相关的CCR5△32、CCR2b-64I、SDF1-3'A等位基因多态性分布

为了调查HIV-1感染相关的等位基因CCR5△32、CCR2b-64I、SDF1-3'A在我国云南省德宏州傣族景颇族人群中的频率和多态性分布,此课题以101例傣族和113例景颇族人群为研究对象,应用PCR、PCR-RFLP(聚合酶链反应-限制性片段长度多态性)分析方法进行检测,计算突变基因频率;并对其群体分布、性别分布进行统计学分析.结果表明,中国傣族景颇族人群中未发现CCR5△32等位基因突变;傣族CCR2b-64I、SDF1-3'A基因突变频率分别为0.2130和0.2030,景颇族CCR2b-64I和SDF1-3'A基因突变频率分别为0.1637和0.1770;与中国汉族人群相比较,傣族和景颇族中SDF1-3'A突变频率较低(P值分别为0.0322和0.0021);两个民族的CCR2b-64I和SDF1-3'A等位基因群体分布符合Hardy-Weinberg平衡,在性别之间分布无显著差异.中国傣族景颇族人群的CCR2b-64I等位基因的突变频率与汉族人相似,SDF1-3'A等位基因的突变频率比汉族人低,此两种突变基因在艾滋病发病过程中的影响值得进一步研究.由于未发现CCR5△32基因突变,中国傣族景颇族人群对HIV-1感染可能有较大的遗传易感性.     

中国傣族、景颇族人群中与艾滋病相关的CCR5△32、CCR2b-64I、SDF1-3′A等位基因多态性分布

为了调查HIV-1感染相关的等位基因CCR5△32、CCR2b-64I、SDF1-3′A在我国云南省德宏州傣族景颇族人群中的频率和多态性分布,此课题以101例傣族和113例景颇族人群为研究对象,应用PCR、PCR-RFLP(聚合酶链反应-限制性片段长度多态性)分析方法进行检测,计算突变基因频率;并对其群体分布、性别分布进行统计学分析。结果表明,中国傣族景颇族人群中未发现CCR5△32等位基因突变;傣族CCR2b-64I、SDF1-3′A基因突变频率分别为0.2130和0.2030,景颇族CCR2b-64I和SDF1-3′A基因突变频率分别为0.1637和0.1770;与中国汉族人群相比较,傣族和景颇族中SDF1-3′A突变频率较低（P值分别为0.0322和0.0021）;两个民族的CCR2b-64I和SDF1-3′A等位基因群体分布符合Hardy-Weinberg平衡,在性别之间分布无显著差异。中国傣族景颇族人群的CCR2b-64I等位基因的突变频率与汉族人相似,SDF1-3′A等位基因的突变频率比汉族人低,此两种突变基因在艾滋病发病过程中的影响值得进一步研究。由于未发现CCR5△32基因突变,中国傣族景颇族人群对HIV-1感染可能有较大的遗传易感性。 Abstract:The purpose of the work is to investigate the frequencies and polymorphisms of HIV-1 resistant CCR5delta32,CCR2b-64I,SDF1-3′A alleles in Chinese Dai and Chingpaw populations.Whole blood samples from 101 Dai subjects and 113 Chingpaw were collected randomly and their genomic DNA were extracted with QIAgen Blood Kits.Allelic frequencies were identified by PCR-RFLP analysis.Allelic polymorphisms in Dai population or Chingpaw population and both sexes in the samples were analyzed by χ2 test.The frequencies of CCR5delta32,CCR2b-64I,SDF1-3′A alleles in Dai population were 0.0000,0.2130,0.2030,respectively;The frequencies of CCR5delta32,CCR2b-64I,SDF1-3′A alleles in Chingpaw population were 0.000,0.1637,0.1770,respectively.Distributions of the CCR2b-64I,SDF1-3′A alleles among the both populations were in accordance with Hardy-Weinberg equilibrium.No statistical difference was found in the allelic frequencies of both CCR2b-64I and SDF1-3′A between male and female individuals.The frequencies of CCR5delta32,CCR2b-64I alleles in Chinese Dai and Chingpaw populations are similar to that in Chinese Han population,while the frequency of SDF1-3′A allele in Chinese Dai and Chingpaw populations are lower in contrast to that in Chinese Han population.The genotyping and polymorphism of CCR5delta32,CCR2b-64I,SDF1-3′A alleles in Chinese Dai and Chingpaw populations of Yunnan Province are the first time studied in China.The significance of the three mutant alleles conferring genetic resistance to HIV-1 and AIDS progression remains to be clarified.     

中国傣族、景颇族人群中与艾滋病相关的CCR5△32、CCR2b-64I、SDF1-3′A等位基因多态性分布

为了调查HIV-1感染相关的等位基因CCR5△32、CCR2b-64I、SDF1-3′A在我国云南省德宏州傣族景颇族人群中的频率和多态性分布,此课题以101例傣族和113例景颇族人群为研究对象,应用PCR、PCR-RFLP(聚合酶链反应-限制性片段长度多态性)分析方法进行检测,计算突变基因频率;并对其群体分布、性别分布进行统计学分析。结果表明,中国傣族景颇族人群中未发现CCR5△32等位基因突变;傣族CCR2b-64I、SDF1-3′A基因突变频率分别为0.2130和0.2030,景颇族CCR2b-64I和SDF1-3′A基因突变频率分别为0.1637和0.1770;与中国汉族人群相比较,傣族和景颇族中SDF1-3′A突变频率较低（P值分别为0.0322和0.0021）;两个民族的CCR2b-64I和SDF1-3′A等位基因群体分布符合Hardy-Weinberg平衡,在性别之间分布无显著差异。中国傣族景颇族人群的CCR2b-64I等位基因的突变频率与汉族人相似,SDF1-3′A等位基因的突变频率比汉族人低,此两种突变基因在艾滋病发病过程中的影响值得进一步研究。由于未发现CCR5△32基因突变,中国傣族景颇族人群对HIV-1感染可能有较大的遗传易感性。 Abstract:The purpose of the work is to investigate the frequencies and polymorphisms of HIV-1 resistant CCR5delta32,CCR2b-64I,SDF1-3′A alleles in Chinese Dai and Chingpaw populations.Whole blood samples from 101 Dai subjects and 113 Chingpaw were collected randomly and their genomic DNA were extracted with QIAgen Blood Kits.Allelic frequencies were identified by PCR-RFLP analysis.Allelic polymorphisms in Dai population or Chingpaw population and both sexes in the samples were analyzed by χ2 test.The frequencies of CCR5delta32,CCR2b-64I,SDF1-3′A alleles in Dai population were 0.0000,0.2130,0.2030,respectively;The frequencies of CCR5delta32,CCR2b-64I,SDF1-3′A alleles in Chingpaw population were 0.000,0.1637,0.1770,respectively.Distributions of the CCR2b-64I,SDF1-3′A alleles among the both populations were in accordance with Hardy-Weinberg equilibrium.No statistical difference was found in the allelic frequencies of both CCR2b-64I and SDF1-3′A between male and female individuals.The frequencies of CCR5delta32,CCR2b-64I alleles in Chinese Dai and Chingpaw populations are similar to that in Chinese Han population,while the frequency of SDF1-3′A allele in Chinese Dai and Chingpaw populations are lower in contrast to that in Chinese Han population.The genotyping and polymorphism of CCR5delta32,CCR2b-64I,SDF1-3′A alleles in Chinese Dai and Chingpaw populations of Yunnan Province are the first time studied in China.The significance of the three mutant alleles conferring genetic resistance to HIV-1 and AIDS progression remains to be clarified.     

辣椒素预防大鼠胃缺血再灌注损伤的作用及机制研究

本研究为探讨辣椒素(CAP)对大鼠胃缺血再灌注损伤(GI-R)的作用及机制。成年雄性健康SD大鼠40只,随机分为4组,每组10只,A组(空白对照组),B组(手术组),C组(CAP组),D组(CAP+手术组)。给予A组、B组大鼠灌胃生理盐水10 m L/kg/d,C组、D组大鼠灌胃CAP1 mg/kg/d。4周后B组、D组于GI-R模型建立后24小时处死大鼠,收集胃液测定胃酸总酸度,肉眼计数胃黏膜损伤指数,行胃窦组织病理学观察,检测胃黏膜辣椒素受体(TRPV1)、降钙素基因相关肽(CGRP)的表达,检测胃窦组织丙二醛(MDA)、超氧化物歧化酶(SOD)的水平。结果显示A组、C组胃黏膜未见损伤;与B组相比,D组胃黏膜损伤程度显著减轻(P0.05),胃酸总酸度显著降低(P0.05),MDA值显著降低(P0.05),SOD值显著升高(P0.05),TRPV1、CGRP表达显著增多(P0.05)。实验结果表明预先给予CAP 1 mg/kg/d连续灌胃4周具有预防缺血再灌注致大鼠胃黏膜损伤的作用,其机制可能与CAP上调TRPV1、CGRP在胃内的表达、减轻氧自由基损伤有关。