目的了解四川凉山彝族成人脂肪和肥胖相关基因(fat mass and obesity associated gene,FTO)多态性与肥胖的关联。方法采用病例对照研究方法,病例组为彝族移民流行病学调查中收集的肥胖者[体重指数(body mass index,BMI)≥28 kg/m^2],共...目的了解四川凉山彝族成人脂肪和肥胖相关基因(fat mass and obesity associated gene,FTO)多态性与肥胖的关联。方法采用病例对照研究方法,病例组为彝族移民流行病学调查中收集的肥胖者[体重指数(body mass index,BMI)≥28 kg/m^2],共322例;对照组为非肥胖非超重者(BMI<24 kg/m^2),按年龄和性别与病例组进行1∶2频数匹配,共644例。采用TaqMan实时荧光定量聚合酶链式反应(polymerase chain reaction,PCR)法对FTO基因(rs1121980和rs17817449)进行基因分型。采用非条件Logistic回归分析模型分析两位点多态性与肥胖的关联。结果彝族农民中,加性模型和显性模型下,rs1121980位点与肥胖均存在统计学关联(加性模型:OR=1.45,95%CI:1.01~2.07,P=0.042;显性模型:OR=1.52,95%CI:1.01~2.31,P=0.048)。彝族农民中未见rs17817449与肥胖存在统计学关联(均有P>0.05)。彝族移民中,两位点(rs1121980和rs17817449)与肥胖均未见统计学关联(均有P>0.05)。结论彝族农民FTO rs1121980多态性与成人肥胖存在统计学关联,A等位基因是肥胖的危险因素。彝族移民FTO两位点与成人肥胖均未见关联。展开更多
The transwell chamber migration assay and CCD digital camera imaging techniques were used to investigate the relationship between regulatory volume decrease (RVD) and cell migration in nasopharyngeal carcinoma cells (...The transwell chamber migration assay and CCD digital camera imaging techniques were used to investigate the relationship between regulatory volume decrease (RVD) and cell migration in nasopharyngeal carcinoma cells (CNE-2Z cells). Both migrated and non-migrated CNE-2Z cells, when swollen by 47% hypotonic solution, exhibited RVD which was inhibited by extracellular application of chloride channel blockers adenosine 5’-triphosphate (ATP), 5-nitro-2-(3- phenylpropylamino) benzoic acid (NPPB) and tamoxifen. However, RVD rate in migrated CNE-2Z cells was bigger than that of non-migrated cells and the sensitivity of migrated cells to NPPB and tamoxifen was higher than that of non- migrated cells. ATP, NPPB and tamoxifen also inhibited migration of CNE-2Z cells. The inhibition of migration was positively correlated to the blockage of RVD, with a correlation coefficient (r) = 0.99, suggesting a functional relation- ship between RVD and cell migration. We conclude that RVD is involved in cell migration and RVD may play an important role in migratory process in CNE-2Z cells.展开更多
This paper introduces a novel technique for object detection using genetic algorithms and morphological processing. The method employs a kind of object oriented structure element, which is derived by genetic algorithm...This paper introduces a novel technique for object detection using genetic algorithms and morphological processing. The method employs a kind of object oriented structure element, which is derived by genetic algorithms. The population of morphological filters is iteratively evaluated according to a statistical performance index corresponding to object extraction ability, and evolves into an optimal structuring element using the evolution principles of genetic search. Experimental results of road extraction from high resolution satellite images are presented to illustrate the merit and feasibility of the proposed method.展开更多
Intramolecular cyclization of N-alkoxyl amines are studied for the stereoselective preparation of 2, 4-disubstituted pyrrolidine derivatives. Reduction of oximes under acidic conditions by NaBH3CN afforded the corres...Intramolecular cyclization of N-alkoxyl amines are studied for the stereoselective preparation of 2, 4-disubstituted pyrrolidine derivatives. Reduction of oximes under acidic conditions by NaBH3CN afforded the corresponding nucleophilic hydroxylamine derivatives, which subsequently cyclized via SN2' mechanism to give the desired N-alkoxyl pyrrolidines.展开更多
文摘目的了解四川凉山彝族成人脂肪和肥胖相关基因(fat mass and obesity associated gene,FTO)多态性与肥胖的关联。方法采用病例对照研究方法,病例组为彝族移民流行病学调查中收集的肥胖者[体重指数(body mass index,BMI)≥28 kg/m^2],共322例;对照组为非肥胖非超重者(BMI<24 kg/m^2),按年龄和性别与病例组进行1∶2频数匹配,共644例。采用TaqMan实时荧光定量聚合酶链式反应(polymerase chain reaction,PCR)法对FTO基因(rs1121980和rs17817449)进行基因分型。采用非条件Logistic回归分析模型分析两位点多态性与肥胖的关联。结果彝族农民中,加性模型和显性模型下,rs1121980位点与肥胖均存在统计学关联(加性模型:OR=1.45,95%CI:1.01~2.07,P=0.042;显性模型:OR=1.52,95%CI:1.01~2.31,P=0.048)。彝族农民中未见rs17817449与肥胖存在统计学关联(均有P>0.05)。彝族移民中,两位点(rs1121980和rs17817449)与肥胖均未见统计学关联(均有P>0.05)。结论彝族农民FTO rs1121980多态性与成人肥胖存在统计学关联,A等位基因是肥胖的危险因素。彝族移民FTO两位点与成人肥胖均未见关联。
基金This work was supported by grants from the Wellcome Trust UK(056909/299/Z)Ministry of Education of China(GJ9901)+1 种基金the Health Department of Guangdong Province(A2001474)Guangdong Medical College Fund for Young Scholars(XQ0306).
文摘The transwell chamber migration assay and CCD digital camera imaging techniques were used to investigate the relationship between regulatory volume decrease (RVD) and cell migration in nasopharyngeal carcinoma cells (CNE-2Z cells). Both migrated and non-migrated CNE-2Z cells, when swollen by 47% hypotonic solution, exhibited RVD which was inhibited by extracellular application of chloride channel blockers adenosine 5’-triphosphate (ATP), 5-nitro-2-(3- phenylpropylamino) benzoic acid (NPPB) and tamoxifen. However, RVD rate in migrated CNE-2Z cells was bigger than that of non-migrated cells and the sensitivity of migrated cells to NPPB and tamoxifen was higher than that of non- migrated cells. ATP, NPPB and tamoxifen also inhibited migration of CNE-2Z cells. The inhibition of migration was positively correlated to the blockage of RVD, with a correlation coefficient (r) = 0.99, suggesting a functional relation- ship between RVD and cell migration. We conclude that RVD is involved in cell migration and RVD may play an important role in migratory process in CNE-2Z cells.
文摘This paper introduces a novel technique for object detection using genetic algorithms and morphological processing. The method employs a kind of object oriented structure element, which is derived by genetic algorithms. The population of morphological filters is iteratively evaluated according to a statistical performance index corresponding to object extraction ability, and evolves into an optimal structuring element using the evolution principles of genetic search. Experimental results of road extraction from high resolution satellite images are presented to illustrate the merit and feasibility of the proposed method.
文摘Intramolecular cyclization of N-alkoxyl amines are studied for the stereoselective preparation of 2, 4-disubstituted pyrrolidine derivatives. Reduction of oximes under acidic conditions by NaBH3CN afforded the corresponding nucleophilic hydroxylamine derivatives, which subsequently cyclized via SN2' mechanism to give the desired N-alkoxyl pyrrolidines.
