Objective:To study the association of environmental adverse factors with early embryo loss,and explore the possible risk factors in daily life. Methods:A questionnaire was administered to 93 new cases of embryo loss(c...Objective:To study the association of environmental adverse factors with early embryo loss,and explore the possible risk factors in daily life. Methods:A questionnaire was administered to 93 new cases of embryo loss(case group) collected in four general hospitals in Tianjin from April 2007 to April 2008 and 93 matched cases of induced abortion(control group) in normal pregnant women who sought the abortion by other reasons.The questionnaire covered information on parental exposure to various environmental factors during and before pregnancy,and the information on daily life.Data were analyzed by single-factor analysis,multiple linear regression and logistic regression analysis.Possible risk factors were identified and odds ratio calculated. Results:Cooking frequently during pregnancy,more daily traffic hours,and decoration history in early pregnancy and paternal exposure to toxic matters three months before pregnancy were associated with early embryo loss, while maternal education was a protective factor. Conclusion:Women exposed to the harmful substances from traffic emissions,cooking and decoration could be at an increased risk of early embryo loss.展开更多
采用可控温的三频段超声波处理机,以牛肉为研究对象,以腌制牛肉样品的蒸煮损失、亚硝酸钠渗透深度、氯化钠含量和剪切力为测定指标,以静止湿腌肉样为对照,研究不同超声处理条件对牛肉腌制与嫩化效果的影响。选择超声频率分别为22、28、4...采用可控温的三频段超声波处理机,以牛肉为研究对象,以腌制牛肉样品的蒸煮损失、亚硝酸钠渗透深度、氯化钠含量和剪切力为测定指标,以静止湿腌肉样为对照,研究不同超声处理条件对牛肉腌制与嫩化效果的影响。选择超声频率分别为22、28、40 k Hz,超声功率分别为180、240、300 W,腌制温度分别为6、8、10℃,处理时间分别为30、60、90、120、150、180、210、240 min,进行单因素试验,再以剪切力和亚硝酸钠渗透深度为测定指标,通过L9(34)正交试验对牛肉的超声波快速腌制工艺条件进行优化。结果表明:超声频率28 k Hz、超声功率180 W、超声温度8℃、超声时间180 min条件下牛肉的保水性和嫩度最优,与静止湿腌相比,超声波腌制速率大大提高,腌制时间缩短了1/3,牛肉嫩度提高了38%。展开更多
文摘Objective:To study the association of environmental adverse factors with early embryo loss,and explore the possible risk factors in daily life. Methods:A questionnaire was administered to 93 new cases of embryo loss(case group) collected in four general hospitals in Tianjin from April 2007 to April 2008 and 93 matched cases of induced abortion(control group) in normal pregnant women who sought the abortion by other reasons.The questionnaire covered information on parental exposure to various environmental factors during and before pregnancy,and the information on daily life.Data were analyzed by single-factor analysis,multiple linear regression and logistic regression analysis.Possible risk factors were identified and odds ratio calculated. Results:Cooking frequently during pregnancy,more daily traffic hours,and decoration history in early pregnancy and paternal exposure to toxic matters three months before pregnancy were associated with early embryo loss, while maternal education was a protective factor. Conclusion:Women exposed to the harmful substances from traffic emissions,cooking and decoration could be at an increased risk of early embryo loss.
文摘采用可控温的三频段超声波处理机,以牛肉为研究对象,以腌制牛肉样品的蒸煮损失、亚硝酸钠渗透深度、氯化钠含量和剪切力为测定指标,以静止湿腌肉样为对照,研究不同超声处理条件对牛肉腌制与嫩化效果的影响。选择超声频率分别为22、28、40 k Hz,超声功率分别为180、240、300 W,腌制温度分别为6、8、10℃,处理时间分别为30、60、90、120、150、180、210、240 min,进行单因素试验,再以剪切力和亚硝酸钠渗透深度为测定指标,通过L9(34)正交试验对牛肉的超声波快速腌制工艺条件进行优化。结果表明:超声频率28 k Hz、超声功率180 W、超声温度8℃、超声时间180 min条件下牛肉的保水性和嫩度最优,与静止湿腌相比,超声波腌制速率大大提高,腌制时间缩短了1/3,牛肉嫩度提高了38%。