目的分析慢性阻塞性肺疾病(chronic obstructive pulmonary disease,COPD)患者肌肉与脂肪状况,并探讨其与疾病发展过程的相关性。方法选取COPD患者118例(研究组)与健康体检者97例(对照组),采用生物电阻抗、身高体重计测定两组患者的体...目的分析慢性阻塞性肺疾病(chronic obstructive pulmonary disease,COPD)患者肌肉与脂肪状况,并探讨其与疾病发展过程的相关性。方法选取COPD患者118例(研究组)与健康体检者97例(对照组),采用生物电阻抗、身高体重计测定两组患者的体重指数(body mass index,BMI)、去脂体重(fat-free mass,FFM)、骨骼肌(skeletal muscle mass,SMM)、四肢骨骼肌指数(appendicular skeletal muscle height index,ASMHI)、体脂率(percent body fat,PBF)、内脏脂肪面积(visceral fat area,VFA)、腰围(waist circumference,WaistCir)、上臂围(arm circumference,AC)、上臂肌围(arm muscle circumference,AMC)、相位角(phase angle,PA)等指标,并进行对比分析;同时收集COPD患者的基本信息、实验室指标及入院肺功能检查数据等,进行相关性分析;根据全球领导人营养不良倡议(Global Leadership Initiative on Malnutrition,GLIM)诊断标准,找出FFM在营养不良诊断中的最佳截断值。结果研究组患者FFM、SMM、双下肢肌肉、ASMHI及AMC均低于对照组(P<0.05)。戒烟组患者BMI、PBF及VFA均高于持续吸烟组(P<0.05);低ASMHI组第1秒用力呼气容积(forced expiratory volume in one second,FEV_(1))、第1秒用力呼气容积占预计值百分比(forced expiratory volume in one second in predicted,FEV_(1)%pred)、用力肺活量(forced vital capacity,FVC)及1秒率(FEV_(1)/FVC)偏低;低ASMHI组中性粒细胞计数与淋巴细胞计数比值(neutrophil-lymphocyte ratio,NLR)高于正常ASMHI组(P<0.05)。GLIM诊断结果显示,50.8%COPD患者存在营养不良,其中FFM预测营养不良的最佳截断值为47.85kg。结论COPD患者易出现肌肉和脂肪分布不平衡。FFM与GLIM诊断的一致性对早期识别和诊断营养不良有重要的临床意义。展开更多
目的探讨静态与动态压力-容积(P-V)曲线低位拐点(LIP)的相关性,为临床选择最佳呼气末正压(PEEP)提供简捷的方法。方法记录14例急性呼吸窘迫综合征(ARDS)患者的准静态及动态肺P-V曲线,确定P-V曲线上的LIP及高位拐点(UIP),将PEEP设定在动...目的探讨静态与动态压力-容积(P-V)曲线低位拐点(LIP)的相关性,为临床选择最佳呼气末正压(PEEP)提供简捷的方法。方法记录14例急性呼吸窘迫综合征(ARDS)患者的准静态及动态肺P-V曲线,确定P-V曲线上的LIP及高位拐点(UIP),将PEEP设定在动态P-V曲线的0、LIP/2、LIP+2 cm H2O、(LIP+UIP)/2和UIP,各水平PEEP分别维持30 min后测血气分析及静态顺应性(Cst)、气道峰压(PIP)、中心静脉压(CVP)及平均动脉压(MAP)。结果14例ARDS患者准静态LIP和动态LIP分别为(6.5±1.7)cm H2O和(4.5±1.7)cmH2O,两者经相关性检验呈正相关(r=0.76,P<0.05)。当PEEP为LIP+2 cm H2O时,PaO2/FiO2及Cst均显著提高(P均<0.01),动态肺顺应性达最高,且对CVP及MAP无明显影响。继续增加PEEP,虽PaO2/FiO2有增高,但Cst及MAP下降,CVP、MAP及平均气道压明显升高。结论动态P-V曲线的LIP+2 cm H2O作为最佳PEEP水平时可获较佳治疗效果。展开更多
利用PCR方法克隆了香蕉束顶病毒中国漳州分离物(BBTV-ZZ)DNA 4编码区,序列分析结果表明该编码区由351个核苷酸组成,推测其编码是一个含116个氨基酸的蛋白质,利用植物双元载体pBin438构建了含有BBTV-ZZ DNA 4编码区的植物组成型表达载体p...利用PCR方法克隆了香蕉束顶病毒中国漳州分离物(BBTV-ZZ)DNA 4编码区,序列分析结果表明该编码区由351个核苷酸组成,推测其编码是一个含116个氨基酸的蛋白质,利用植物双元载体pBin438构建了含有BBTV-ZZ DNA 4编码区的植物组成型表达载体pBBTV-4B,经农杆菌介导转化了三生烟(Nicotiana tabacum Xanthi nc),在防虫条件下,将运动缺陷型CMV-Fny突变株(CMV-Fny-△MP)人工接种到转基因植株下部叶片上,12d后,在转基因植株的非接种叶上显现出不同程度的系统侵染症状,间接异种动物双抗体夹心酶联免疫吸附方法(DAS-ELISA)检测结果显示在转基因植株的上部非接种叶中有CMV-Fny的积累,而非转基因对照植株组的上部非接种叶中始终没有显现系统侵染症状,DAS-ELISA检测也未见CMV-Fny的积累,这些实验结果表明转基因植株能够支持CMV-Fny-△Mp从细胞到细胞和长距离运动并形成系统侵染症状,由此推测BBTV-ZZ DNA 4编码的蛋白质可能具有运动蛋白功能。展开更多
Banana bunchy top virus disease (BBTD) is a disastrous disease in bananas, and it is spreading in the world (including China) by the banana bunchy top virus(BBTV). At present, virus\|free plantlets are used to prevent...Banana bunchy top virus disease (BBTD) is a disastrous disease in bananas, and it is spreading in the world (including China) by the banana bunchy top virus(BBTV). At present, virus\|free plantlets are used to prevent BBTD in banana production, therefore, it is very important to establish a method to detect BBTV quickly, sensitively and specifically. ELISA is now popularly used to detect BBTV. The sensitivity of this method is not high enough, and needs specific antiserum, otherwise, pseudo\|positive results often occur. According to DNA coding sequences of component Ⅲ,Ⅳ and Ⅰ of BBTV isolates from Zhangzhou, China, three pairs of primers are designed to establish a PCR method to specifically amplify parts of coding sequences of the BBTV coat protein, movement protein and replicase\|association. This method is also applicable to detect BBTV of bananas or cultured banana seedlings in other regions.展开更多
Banana bunchy top virus Chinese Zhangzhou isolate (BBTV-ZZ) DNA 4 was amplified by PCR and cloned. Sequence analysis showed that BBTV-ZZ DNA 4 is 1 039 nucleotides (nts) in length and this virus could be one member of...Banana bunchy top virus Chinese Zhangzhou isolate (BBTV-ZZ) DNA 4 was amplified by PCR and cloned. Sequence analysis showed that BBTV-ZZ DNA 4 is 1 039 nucleotides (nts) in length and this virus could be one member of BBTV Asian group. Transcriptional initiation site A, which is at the 269 nucleotide, was preliminarily determined by using 5' RACE method. BBTV-ZZ DNA 4 non-coding region was sub-cloned by PCR and inserted into upstream of gfp : : gus plant expression vector pCAMBIA 1304 to construct recombinant plasmid pTA2. Agrobacterium tumefaciens harboring pTA2 was injected into leaves of the tobacco (Nicotiana tabacum L. cv. Xanthi NC) via Agrobacterium-infiltration procedure. Transient expressions of GUS and GFP were determined in injected leaves 3 - 5 d later. GUS activities of pTA2, pCAMBIA 1304 injected and non-injected tobacco leaves respectively were 1.007 0 pmol MU(.)mug(-1.)min(-1), 2.069 0 pmol MU(.)mug(-1.)min(-1) and 0.021 4 pmol MU(.)mug(-1.)min(-1). Indirect ELISA for GFP in 1 mg total protein from pTA2, pCAMBIA 1304 injected and non-injected leaves showed an A(490 nm) value of 89.577, 100.440 and 3.287, respectively. These results showed that the non-coding region of BBTV-ZZ DNA 4 has a promoter activity not only in the virus replication in monocot, but also in driving the expression of a foreign gene in dicot plants.展开更多
文摘目的分析慢性阻塞性肺疾病(chronic obstructive pulmonary disease,COPD)患者肌肉与脂肪状况,并探讨其与疾病发展过程的相关性。方法选取COPD患者118例(研究组)与健康体检者97例(对照组),采用生物电阻抗、身高体重计测定两组患者的体重指数(body mass index,BMI)、去脂体重(fat-free mass,FFM)、骨骼肌(skeletal muscle mass,SMM)、四肢骨骼肌指数(appendicular skeletal muscle height index,ASMHI)、体脂率(percent body fat,PBF)、内脏脂肪面积(visceral fat area,VFA)、腰围(waist circumference,WaistCir)、上臂围(arm circumference,AC)、上臂肌围(arm muscle circumference,AMC)、相位角(phase angle,PA)等指标,并进行对比分析;同时收集COPD患者的基本信息、实验室指标及入院肺功能检查数据等,进行相关性分析;根据全球领导人营养不良倡议(Global Leadership Initiative on Malnutrition,GLIM)诊断标准,找出FFM在营养不良诊断中的最佳截断值。结果研究组患者FFM、SMM、双下肢肌肉、ASMHI及AMC均低于对照组(P<0.05)。戒烟组患者BMI、PBF及VFA均高于持续吸烟组(P<0.05);低ASMHI组第1秒用力呼气容积(forced expiratory volume in one second,FEV_(1))、第1秒用力呼气容积占预计值百分比(forced expiratory volume in one second in predicted,FEV_(1)%pred)、用力肺活量(forced vital capacity,FVC)及1秒率(FEV_(1)/FVC)偏低;低ASMHI组中性粒细胞计数与淋巴细胞计数比值(neutrophil-lymphocyte ratio,NLR)高于正常ASMHI组(P<0.05)。GLIM诊断结果显示,50.8%COPD患者存在营养不良,其中FFM预测营养不良的最佳截断值为47.85kg。结论COPD患者易出现肌肉和脂肪分布不平衡。FFM与GLIM诊断的一致性对早期识别和诊断营养不良有重要的临床意义。
文摘目的探讨静态与动态压力-容积(P-V)曲线低位拐点(LIP)的相关性,为临床选择最佳呼气末正压(PEEP)提供简捷的方法。方法记录14例急性呼吸窘迫综合征(ARDS)患者的准静态及动态肺P-V曲线,确定P-V曲线上的LIP及高位拐点(UIP),将PEEP设定在动态P-V曲线的0、LIP/2、LIP+2 cm H2O、(LIP+UIP)/2和UIP,各水平PEEP分别维持30 min后测血气分析及静态顺应性(Cst)、气道峰压(PIP)、中心静脉压(CVP)及平均动脉压(MAP)。结果14例ARDS患者准静态LIP和动态LIP分别为(6.5±1.7)cm H2O和(4.5±1.7)cmH2O,两者经相关性检验呈正相关(r=0.76,P<0.05)。当PEEP为LIP+2 cm H2O时,PaO2/FiO2及Cst均显著提高(P均<0.01),动态肺顺应性达最高,且对CVP及MAP无明显影响。继续增加PEEP,虽PaO2/FiO2有增高,但Cst及MAP下降,CVP、MAP及平均气道压明显升高。结论动态P-V曲线的LIP+2 cm H2O作为最佳PEEP水平时可获较佳治疗效果。
文摘利用PCR方法克隆了香蕉束顶病毒中国漳州分离物(BBTV-ZZ)DNA 4编码区,序列分析结果表明该编码区由351个核苷酸组成,推测其编码是一个含116个氨基酸的蛋白质,利用植物双元载体pBin438构建了含有BBTV-ZZ DNA 4编码区的植物组成型表达载体pBBTV-4B,经农杆菌介导转化了三生烟(Nicotiana tabacum Xanthi nc),在防虫条件下,将运动缺陷型CMV-Fny突变株(CMV-Fny-△MP)人工接种到转基因植株下部叶片上,12d后,在转基因植株的非接种叶上显现出不同程度的系统侵染症状,间接异种动物双抗体夹心酶联免疫吸附方法(DAS-ELISA)检测结果显示在转基因植株的上部非接种叶中有CMV-Fny的积累,而非转基因对照植株组的上部非接种叶中始终没有显现系统侵染症状,DAS-ELISA检测也未见CMV-Fny的积累,这些实验结果表明转基因植株能够支持CMV-Fny-△Mp从细胞到细胞和长距离运动并形成系统侵染症状,由此推测BBTV-ZZ DNA 4编码的蛋白质可能具有运动蛋白功能。
文摘Banana bunchy top virus disease (BBTD) is a disastrous disease in bananas, and it is spreading in the world (including China) by the banana bunchy top virus(BBTV). At present, virus\|free plantlets are used to prevent BBTD in banana production, therefore, it is very important to establish a method to detect BBTV quickly, sensitively and specifically. ELISA is now popularly used to detect BBTV. The sensitivity of this method is not high enough, and needs specific antiserum, otherwise, pseudo\|positive results often occur. According to DNA coding sequences of component Ⅲ,Ⅳ and Ⅰ of BBTV isolates from Zhangzhou, China, three pairs of primers are designed to establish a PCR method to specifically amplify parts of coding sequences of the BBTV coat protein, movement protein and replicase\|association. This method is also applicable to detect BBTV of bananas or cultured banana seedlings in other regions.
文摘Banana bunchy top virus Chinese Zhangzhou isolate (BBTV-ZZ) DNA 4 was amplified by PCR and cloned. Sequence analysis showed that BBTV-ZZ DNA 4 is 1 039 nucleotides (nts) in length and this virus could be one member of BBTV Asian group. Transcriptional initiation site A, which is at the 269 nucleotide, was preliminarily determined by using 5' RACE method. BBTV-ZZ DNA 4 non-coding region was sub-cloned by PCR and inserted into upstream of gfp : : gus plant expression vector pCAMBIA 1304 to construct recombinant plasmid pTA2. Agrobacterium tumefaciens harboring pTA2 was injected into leaves of the tobacco (Nicotiana tabacum L. cv. Xanthi NC) via Agrobacterium-infiltration procedure. Transient expressions of GUS and GFP were determined in injected leaves 3 - 5 d later. GUS activities of pTA2, pCAMBIA 1304 injected and non-injected tobacco leaves respectively were 1.007 0 pmol MU(.)mug(-1.)min(-1), 2.069 0 pmol MU(.)mug(-1.)min(-1) and 0.021 4 pmol MU(.)mug(-1.)min(-1). Indirect ELISA for GFP in 1 mg total protein from pTA2, pCAMBIA 1304 injected and non-injected leaves showed an A(490 nm) value of 89.577, 100.440 and 3.287, respectively. These results showed that the non-coding region of BBTV-ZZ DNA 4 has a promoter activity not only in the virus replication in monocot, but also in driving the expression of a foreign gene in dicot plants.
