目的:应用定量CT(QCT)测量腰椎骨密度(BMD),分析不同年龄、生理时期女性腰椎BMD与腹部脂肪的相关性。方法:选取我院健康体检中心的体检女性300例,年龄25~85岁。根据年龄分为3组:青年组(n=82)、中年组(n=132)、老年组(n=86),根据不同生...目的:应用定量CT(QCT)测量腰椎骨密度(BMD),分析不同年龄、生理时期女性腰椎BMD与腹部脂肪的相关性。方法:选取我院健康体检中心的体检女性300例,年龄25~85岁。根据年龄分为3组:青年组(n=82)、中年组(n=132)、老年组(n=86),根据不同生理时期分为3组:绝经前组(n=169)、围绝经期组(n=33)、绝经后组(n=98);测量其体重、身高、腰围、臀围,并计算腰臀比、体重指数(BMI)。数据上传至Midways pro 6.1QCT分析系统,测量L 1~L 2椎体BMD、脐水平腹部脂肪面积(FA)、内脏脂肪面积(VFA),计算腰椎平均骨密度(vBMD)及腹壁脂肪面积(SFA)。分析不同年龄及不同生理时期女性腰椎BMD与腹部脂肪参数的相关性。结果:不同年龄组体重、臀围、腰围、腰臀比及BMI比较差异具有统计学意义(P<0.05),围绝经期前后女性体重、腰围及腰臀比差异具有统计学意义(P<0.05)。老年组和中年组的FA、VFA显著高于青年组,老年组的FA、VFA显著高于中年组,不同年龄组的vBMD、FA、VFA比较差异具有统计学意义(P<0.05)。青年组的vBMD与FA、VFA及SFA呈负相关,老年组的vBMD与BMI、VFA呈正相关(P<0.05)。绝经前组的vBMD显著高于绝经后组和围绝经期组,围绝经期组的vBMD显著高于绝经后组。绝经后组和围绝经期组的FA、VFA显著高于绝经前组;绝经前女性vBMD与VFA呈负相关,围绝经期女性vBMD与FA、VFA呈负相关,绝经后女性vBMD与VFA呈正相关(P<0.05)。结论:女性腰椎BMD与腹部脂肪组织的关系较为复杂,不同年龄段及不同生理时期两者关系各异,对于围绝经期而言,脂肪组织与雌激素可能共同参与对机体BMD的调节,因此需定期检测BMD及脂肪含量,对骨质疏松做到早发现、早干预,提高女性生活质量。展开更多
Gray cast iron that is used for automobile engine cylinder liners was laser surface hardened using Nd ： YAG quasi-continuous and CO2 continuous wave laser, respectively. The macromorphology and microstructure of the ...Gray cast iron that is used for automobile engine cylinder liners was laser surface hardened using Nd ： YAG quasi-continuous and CO2 continuous wave laser, respectively. The macromorphology and microstructure of the laser surface hardened layers were investigated using an optical microscope. Geometric dimensions including depth and width and microhardness distribution of the hardened layers were also examined in order to evaluate the quality of the hardened layers.展开更多
The effect of salinity on the growth and muscle nutritional quality of theExopalaemon carinicauda was studied through testing the survival rate, specific growthrate, muscle nutrient composition, amino acid composition...The effect of salinity on the growth and muscle nutritional quality of theExopalaemon carinicauda was studied through testing the survival rate, specific growthrate, muscle nutrient composition, amino acid composition and content by the culturingin different salinities(0-30).The results showed that the survival rate of salinity (0-30)had no significant difference (P>0.05), and the specific growth rates at salinity 15 andsalinity 20 were significantly higher than others(P>0.05); the muscle moisture contentand the crude fat content significantly decreased(P<0.05), while the muscle crudeprotein content significantly increased with an increase in the environment salinity from0 to 30(P <0.05).The crude ash content with salinity increase had a slight increase; themuscle crude protein content (18.2) at salinity 15 was significantly higher than that atsalinity 0,5, or 10(P <0.05), but there was no significant difference between salinity 15and salinity 20(P>0.05). No significant difference was found in total amino acid contentor total essential amino acid content from salinity 0 to 30(P>0.05). Total delicious aminoacid content at salinity 15-30 was significantly higher than those at salinity 0-10(P<0.05), while there was no significant difference from salinity 15 to 30(P>0.05). Theresults suggest that the suitable salinity for muscle nutritive value ranges from 15 to 30,and the Exopalaemon carinicauda can potentially be cultured above the salinity 15.展开更多
文摘目的:应用定量CT(QCT)测量腰椎骨密度(BMD),分析不同年龄、生理时期女性腰椎BMD与腹部脂肪的相关性。方法:选取我院健康体检中心的体检女性300例,年龄25~85岁。根据年龄分为3组:青年组(n=82)、中年组(n=132)、老年组(n=86),根据不同生理时期分为3组:绝经前组(n=169)、围绝经期组(n=33)、绝经后组(n=98);测量其体重、身高、腰围、臀围,并计算腰臀比、体重指数(BMI)。数据上传至Midways pro 6.1QCT分析系统,测量L 1~L 2椎体BMD、脐水平腹部脂肪面积(FA)、内脏脂肪面积(VFA),计算腰椎平均骨密度(vBMD)及腹壁脂肪面积(SFA)。分析不同年龄及不同生理时期女性腰椎BMD与腹部脂肪参数的相关性。结果:不同年龄组体重、臀围、腰围、腰臀比及BMI比较差异具有统计学意义(P<0.05),围绝经期前后女性体重、腰围及腰臀比差异具有统计学意义(P<0.05)。老年组和中年组的FA、VFA显著高于青年组,老年组的FA、VFA显著高于中年组,不同年龄组的vBMD、FA、VFA比较差异具有统计学意义(P<0.05)。青年组的vBMD与FA、VFA及SFA呈负相关,老年组的vBMD与BMI、VFA呈正相关(P<0.05)。绝经前组的vBMD显著高于绝经后组和围绝经期组,围绝经期组的vBMD显著高于绝经后组。绝经后组和围绝经期组的FA、VFA显著高于绝经前组;绝经前女性vBMD与VFA呈负相关,围绝经期女性vBMD与FA、VFA呈负相关,绝经后女性vBMD与VFA呈正相关(P<0.05)。结论:女性腰椎BMD与腹部脂肪组织的关系较为复杂,不同年龄段及不同生理时期两者关系各异,对于围绝经期而言,脂肪组织与雌激素可能共同参与对机体BMD的调节,因此需定期检测BMD及脂肪含量,对骨质疏松做到早发现、早干预,提高女性生活质量。
文摘Gray cast iron that is used for automobile engine cylinder liners was laser surface hardened using Nd ： YAG quasi-continuous and CO2 continuous wave laser, respectively. The macromorphology and microstructure of the laser surface hardened layers were investigated using an optical microscope. Geometric dimensions including depth and width and microhardness distribution of the hardened layers were also examined in order to evaluate the quality of the hardened layers.
基金supported by Fund of Key Laboratory of South China Sea Fishery Resources Exploitation & Utilization,Ministry of Agriculture,P.R.China(LSF2012-05)
文摘The effect of salinity on the growth and muscle nutritional quality of theExopalaemon carinicauda was studied through testing the survival rate, specific growthrate, muscle nutrient composition, amino acid composition and content by the culturingin different salinities(0-30).The results showed that the survival rate of salinity (0-30)had no significant difference (P>0.05), and the specific growth rates at salinity 15 andsalinity 20 were significantly higher than others(P>0.05); the muscle moisture contentand the crude fat content significantly decreased(P<0.05), while the muscle crudeprotein content significantly increased with an increase in the environment salinity from0 to 30(P <0.05).The crude ash content with salinity increase had a slight increase; themuscle crude protein content (18.2) at salinity 15 was significantly higher than that atsalinity 0,5, or 10(P <0.05), but there was no significant difference between salinity 15and salinity 20(P>0.05). No significant difference was found in total amino acid contentor total essential amino acid content from salinity 0 to 30(P>0.05). Total delicious aminoacid content at salinity 15-30 was significantly higher than those at salinity 0-10(P<0.05), while there was no significant difference from salinity 15 to 30(P>0.05). Theresults suggest that the suitable salinity for muscle nutritive value ranges from 15 to 30,and the Exopalaemon carinicauda can potentially be cultured above the salinity 15.
