大黄抑制鼠疫耶尔森菌的基因芯片检测

目的 研究基因组芯片检测大黄抑制鼠疫耶尔森菌分子机制的方法 .方法 使用的鼠疫耶尔森菌全基因组芯片包含4005条鼠疫耶尔森菌基囚.应用液体稀释法测定大黄对鼠疫耶尔森菌的最小抑菌浓度(MIC),基因芯片表达谱实验中,大黄作用鼠疫耶尔森菌的浓度为10×MIC,作用时间为30 min,提取并纯化鼠疫耶尔森菌总RNA,反转录合成cDNA,用Cy3,Cy5染料标记后,与鼠疫耶尔森菌全基因组芯片杂交,通过芯片扫描仪获得表达谱分析结果 .应用实时定量PCR技术对芯片结果 进行验证.结果 大黄对鼠疫耶尔森菌的MIC为0.02500 kg/L.获得了大黄作用鼠疫耶尔森菌的基因芯片表达谱.大黄作用鼠疫菌的明显差异表达基凶共有498个,上渊基闪358个,下凋基因140个.结论 应用鼠疫耶尔森菌全基因组DNA芯片可以进行大黄抑制鼠疫耶尔森菌的分子作用机制研究.     

保健食品中总黄酮的超声波提取条件优化研究

目的研究保健食品总黄酮含量测定的超声提取最佳条件。方法采用单因素分析法和正交试验法,以保健食品总黄酮含量为考察指标,研究不同料液比(1:25～1:5)、超声提取时间(10～40min)和乙醇浓度(50%～100%)对保健食品总黄酮提取量的影响。采用紫外分光光度法进行测定。结果由正交试验数据分析可知,影响因素的主次顺序是料液比乙醇浓度提取时间。在60%乙醇,料液比1:20,超声提取时间为20min条件下从保健食品中提取出的总黄酮含量最高,平均值为5.370mg。总黄酮的线性范围在1.0～40μg/ml之间,所得回归方程为y=0.0033x-0.0109,相关系数为0.9995,检出限为1.0μg/ml。该方法的加标回收率为95%～104%(n=3),RSD为1.717%(n=5)。结论该方法在最佳提取条件下进行,精密度和准确度均较高,空白低且稳定,适用于保健食品和某些食品中总黄酮的检测。     

PAEs对原代培养的大鼠脂肪细胞PPAR-γ2表达的影响

目的：观察邻苯二甲酸酯类化合物（Phthalate acid esters,PAEs）对原代培养的大鼠脂肪细胞过氧化物酶体增殖剂激活受体-γ 2（Peroxisome prolifcrator activated receptor gamma 2,PPAR-γ 2）mRNA表达的影响。方法：对脂肪细胞进行PAEs染毒培养,观察脂肪细胞多方面的变化,评价PAEs对脂肪细胞的影响。主要实验：①显微镜每天观察脂肪细胞的形态变化;②油红O染色提取法和MTT比色法检查脂肪细胞的生长状况;③提取脂肪细胞的总RNA,通过逆转录PCR实验,分析PPAR-γ 2 mR－NA的表达情况。结果：①PAEs处理过的脂肪细胞由最初的小圆形变化为梭形最后变成椭圆形,大鼠脂肪细胞内出现脂肪颗粒,并逐渐增加,最后部分脂肪颗粒融合为较大的脂肪颗粒,符合脂肪细胞的发育规律。②随着培养液中PAEs浓度的增加,大鼠脂肪细胞产生的脂肪颗粒数量增多。③PPAR-γ 2的表达随着PAEs浓度的增加而增加。结论：可以认为PAEs通过增强PPAR-γ 2表达来促进脂肪细胞的生长发育,研究结果将会为研究PAEs与肥胖的关系提供科学依据,为进一步研究PAEs对健康的影响提供了一个新的思路。     

用计算器拟合标准曲线计算检验结果的几种方法

长期以来，在各级各类医院、防疫站检验工作及大、中专学校检验专业实验教学中，分光光度法、离子选择电极法多采用在坐标纸或半对数坐标纸上人工拟合标准曲线，再查图确定样品中待测成分含量的方法。这种方法作图费时，查图困难，人为误差大。为减轻检验人员负担，消除人为误差，提高工作效率和工作质量。基于目前半自动、全自动分析仪尚未普及及应用以     

应用鼠疫菌全基因组芯片研究黄连抑菌机制的方法建立

目的建立一种应用鼠疫耶尔森菌全基因组芯片研究黄连对鼠疫耶尔森菌抑制作用分子机制的方法。方法应用液体稀释法测定黄连对鼠疫耶尔森菌的最小抑菌浓度（MIC）;鼠疫耶尔森菌全基因组芯片包含4005条鼠疫耶尔森菌基因。基因芯片表达谱实验中,黄连作用鼠疫耶尔森菌的浓度为10×MIC,作用时间为30min;提取并纯化鼠疫耶尔森菌总RNA;逆转录合成cDNA;Cy3、Cy5染料标记后;与鼠疫耶尔森菌全基因组芯片杂交;通过芯片扫描仪获得表达谱分析结果。应用SAM软件处理结果。结果获得了黄连作用鼠疫耶尔森菌的基因芯片表达谱。结论应用鼠疫耶尔森菌全基因组DNA芯片可以进行黄连抑制鼠疫耶尔森菌的分子作用机制研究。     

汽车内空气污染状况分析

目的 对新车内空气中苯、甲苯和甲醛浓度进行分析，了解其车内空气的污染程度。方法 采用甲醛分析仪，气相色谱仪进行测定。结果 65辆新车中甲醛、苯、甲苯的总合格率分别为85％、65％、58％。第2、3、4个月甲醛浓度合格率分别为81％、59％、91％；苯浓度合格率分别为66％、45％、82％；甲苯浓度合格率分别为38％、64％、73％。结论 甲醛超标程度较小，苯和甲苯超标比较严重。     

2007年重庆市云阳县和璧山县8～10岁儿童尿碘水平分析

Objective To determine the urinary iodine level of people in Yunyang and Bishan County of Chongqing and explore into its influencing factors. Methods Using multistage cluster stratified simple random sample method, Yunyang and Bishan County were chosen as research spots, then thirty children aged 8-10 in each 3 primary school of the 2 counties were selected using stratified randomization sampling method to inspected their urine and household salt for iodine and the iodine content in drinking water. Results Five hundred and seventy-one urine samples were inspected and the urinary iodine median was 261.47 μg/L. 5.78% (33/571) and 37.48%(214/571) of samples had an urinary iodine median less than 100 μg/L and more than 300 μg/L. The urinary iodine median of Yunyang County was higher than that of Bishan (H = 7.42, P < 0.01). The iodine salt coverage rate, the qualified rate and edible qualified iodine salt rate respectively were 99.64%(554/556), 94.22% (522/554) and 93.88% (522/556) in 556 samples of family table salt. Eighty-seven samples of drinking water were inspected, resulting an averaged iodine content of 8.81 and 2.97 μg/L, respectively in the 2 counties. Conclusions The 2 counties are all the area of iodine deficiency. The urinary iodine level, although meeting the demand of eliminating iodine deficiency diseases, is a little bit higher given that iodized salt of present doage has been taken for a long time. The content of iodized salt should be adjusted accordingly.     

2007年重庆市云阳县和璧山县8～10岁儿童尿碘水平分析

Objective To determine the urinary iodine level of people in Yunyang and Bishan County of Chongqing and explore into its influencing factors. Methods Using multistage cluster stratified simple random sample method, Yunyang and Bishan County were chosen as research spots, then thirty children aged 8-10 in each 3 primary school of the 2 counties were selected using stratified randomization sampling method to inspected their urine and household salt for iodine and the iodine content in drinking water. Results Five hundred and seventy-one urine samples were inspected and the urinary iodine median was 261.47 μg/L. 5.78% (33/571) and 37.48%(214/571) of samples had an urinary iodine median less than 100 μg/L and more than 300 μg/L. The urinary iodine median of Yunyang County was higher than that of Bishan (H = 7.42, P < 0.01). The iodine salt coverage rate, the qualified rate and edible qualified iodine salt rate respectively were 99.64%(554/556), 94.22% (522/554) and 93.88% (522/556) in 556 samples of family table salt. Eighty-seven samples of drinking water were inspected, resulting an averaged iodine content of 8.81 and 2.97 μg/L, respectively in the 2 counties. Conclusions The 2 counties are all the area of iodine deficiency. The urinary iodine level, although meeting the demand of eliminating iodine deficiency diseases, is a little bit higher given that iodized salt of present doage has been taken for a long time. The content of iodized salt should be adjusted accordingly.     

2007年重庆市云阳县和璧山县8～10岁儿童尿碘水平分析

Objective To determine the urinary iodine level of people in Yunyang and Bishan County of Chongqing and explore into its influencing factors. Methods Using multistage cluster stratified simple random sample method, Yunyang and Bishan County were chosen as research spots, then thirty children aged 8-10 in each 3 primary school of the 2 counties were selected using stratified randomization sampling method to inspected their urine and household salt for iodine and the iodine content in drinking water. Results Five hundred and seventy-one urine samples were inspected and the urinary iodine median was 261.47 μg/L. 5.78% (33/571) and 37.48%(214/571) of samples had an urinary iodine median less than 100 μg/L and more than 300 μg/L. The urinary iodine median of Yunyang County was higher than that of Bishan (H = 7.42, P < 0.01). The iodine salt coverage rate, the qualified rate and edible qualified iodine salt rate respectively were 99.64%(554/556), 94.22% (522/554) and 93.88% (522/556) in 556 samples of family table salt. Eighty-seven samples of drinking water were inspected, resulting an averaged iodine content of 8.81 and 2.97 μg/L, respectively in the 2 counties. Conclusions The 2 counties are all the area of iodine deficiency. The urinary iodine level, although meeting the demand of eliminating iodine deficiency diseases, is a little bit higher given that iodized salt of present doage has been taken for a long time. The content of iodized salt should be adjusted accordingly.     

2007年重庆市云阳县和璧山县8～10岁儿童尿碘水平分析

目的 了解重庆市抽样地区人群尿碘水平,探讨其影响因素.方法 选择重庆市渝东地区的云阳县和渝西地区的璧山县为调查县,采用多级整群随机抽样方法,在两县经济状况为中等的一类乡镇中,各抽取3所乡镇小学,在每所小学选择8～10岁儿童30名作为调查对象,检测其尿碘、家庭食用盐含碘量,采集当地居民饮用水水样,检测含碘量.结果 共检测儿童尿样571份,云阳县和璧山县总的尿碘中位数为261.47μg/L,尿碘<100μg/L和>300μg/L的比例分别为5.78%(33/571)和37.48%(214/571);云阳县儿童尿碘中位数(278.64μg/L)高于璧山县(240.6μg/L),二者比较差异有统计学意义(H=7.42,P<0.01).检测家庭食用盐556份,碘盐覆盖率、碘盐合格率、合格碘盐食用率分别为99.64%(554/556)、94.22%(522/554)、93.88%(522/556).检测居民饮用水87份,两县水碘均值分别为8.81、2.97μg/L.结论 云阳县、璧山县均为缺碘地区,人群尿碘水平达到消除碘缺乏病的标准.但在长期食用现行加碘量食盐的情况下,调查地区儿童尿碘水平有偏高的趋势,可考虑适当调整食盐含碘量.