The effects of self-seeding nucleation on the crystallization behavior and properties of poly(trimethylene terephthalate) were studied.Differential scanning calorimetry(DSC) results indicated that the crystallization ...The effects of self-seeding nucleation on the crystallization behavior and properties of poly(trimethylene terephthalate) were studied.Differential scanning calorimetry(DSC) results indicated that the crystallization temperature of poly(trimethylene terephthalate) increased obviously(increased about 20℃) after the process of self-seeding nucleation.The results of polarized light microscopy(PLM) showed that the spherulite size decreased markedly from 40 μm to 8 μm.展开更多
目的:研究环境内分泌干扰物邻苯二甲酸二(2-乙已基)酯(Di-(2-ethylhexyl)phthalate,DEHP)作用于孕鼠后,其胎鼠睾丸组织中胰岛素样因子3(Insulin like factor3,INSL3)mRNA和蛋白质的表达情况;探讨DEHP诱发小鼠隐睾的分子机制.方法:妊娠K...目的:研究环境内分泌干扰物邻苯二甲酸二(2-乙已基)酯(Di-(2-ethylhexyl)phthalate,DEHP)作用于孕鼠后,其胎鼠睾丸组织中胰岛素样因子3(Insulin like factor3,INSL3)mRNA和蛋白质的表达情况;探讨DEHP诱发小鼠隐睾的分子机制.方法:妊娠KM小鼠随机分为3组:正常对照组、玉米油对照组和DEHP实验组.玉米油对照组和DEHP实验组自妊娠12.5d到妊娠18d分别持续经口予以玉米油和DEHP500mg/(kg.d),正常对照组不予灌药.结果:正常对照组和玉米油对照组睾丸组织中INSL3 mRNA和蛋白质的表达均无差异(P>0.05);DEHP实验组INSL3 mRNA的表达量约为对照组的1/3,与对照组相比其差异具有显著性(P<0.05);实验组INSL3蛋白质的表达量约为对照组的1/4,与对照组相比其差异具有显著性(P<0.05).结论:环境内分泌干扰物DEHP下调睾丸间质细胞INSL3 mRNA和蛋白质的表达,影响睾丸引带发育,可能是DEHP诱发隐睾的分子机制之一.展开更多
目的:探讨邻苯二甲酸二乙基己酯(DEHP)对新生小鼠睾丸及Leydig细胞形态结构及功能的影响。方法:DEHP分别以低、中、高3组剂量[100、200、500mg/(kg·d)]灌胃作用于怀孕12d到产后3d(GD12~PND3)的KM母鼠,观察DEHP对新生雄...目的:探讨邻苯二甲酸二乙基己酯(DEHP)对新生小鼠睾丸及Leydig细胞形态结构及功能的影响。方法:DEHP分别以低、中、高3组剂量[100、200、500mg/(kg·d)]灌胃作用于怀孕12d到产后3d(GD12~PND3)的KM母鼠,观察DEHP对新生雄性仔鼠体重、睾丸重量、Leydig细胞形态结构和3β-羟基类固醇脱氢酶(3β—HSD)活性、酶反应面积的影响。结果:DEHP作用于母鼠后,其雄性子代幼鼠体重和睾丸重量减轻,睾丸Leydig细胞形态、超微结构发生改变;高剂量组Leydig细胞数量明显增多;低、中剂量组睾酮合成关键酶3β-HSD酶活性下降,酶反应面积减小,但高剂量组在仔鼠出生后15d时酶活性降低[(吸光度值(0.154±0.011)1)8空白对照组(0.222±0.013),P〈0.01],而酶反应面积增大[(6303.0±745.6)μm^2 vs 空白对照组(5091.4±214.4)μm^2,P〈0.01)]。结论:DEHP能影响新生雄性小鼠体重、睾丸重量、Leydig细胞的形态结构和3B—HSD活性,具有抗雄激素效应。展开更多
文摘The effects of self-seeding nucleation on the crystallization behavior and properties of poly(trimethylene terephthalate) were studied.Differential scanning calorimetry(DSC) results indicated that the crystallization temperature of poly(trimethylene terephthalate) increased obviously(increased about 20℃) after the process of self-seeding nucleation.The results of polarized light microscopy(PLM) showed that the spherulite size decreased markedly from 40 μm to 8 μm.
文摘目的:探讨邻苯二甲酸二乙基己酯(DEHP)对新生小鼠睾丸及Leydig细胞形态结构及功能的影响。方法:DEHP分别以低、中、高3组剂量[100、200、500mg/(kg·d)]灌胃作用于怀孕12d到产后3d(GD12~PND3)的KM母鼠,观察DEHP对新生雄性仔鼠体重、睾丸重量、Leydig细胞形态结构和3β-羟基类固醇脱氢酶(3β—HSD)活性、酶反应面积的影响。结果:DEHP作用于母鼠后,其雄性子代幼鼠体重和睾丸重量减轻,睾丸Leydig细胞形态、超微结构发生改变;高剂量组Leydig细胞数量明显增多;低、中剂量组睾酮合成关键酶3β-HSD酶活性下降,酶反应面积减小,但高剂量组在仔鼠出生后15d时酶活性降低[(吸光度值(0.154±0.011)1)8空白对照组(0.222±0.013),P〈0.01],而酶反应面积增大[(6303.0±745.6)μm^2 vs 空白对照组(5091.4±214.4)μm^2,P〈0.01)]。结论:DEHP能影响新生雄性小鼠体重、睾丸重量、Leydig细胞的形态结构和3B—HSD活性,具有抗雄激素效应。