新鲜周期第5天囊胚形成的影响因素分析及列线图模型的构建与验证

目的 探究新鲜周期第5天(D5)囊胚形成的影响因素,构建并验证列线图预测模型。方法 回顾性分析2019年1月至2022年3月在焦作市妇幼保健院生殖医学科接受体外受精治疗的1 384例患者的数据资料,按照7∶3的比例随机将患者分为训练集(952例)和验证集(432例)。通过单因素分析及多因素logistic回归分析筛选D5囊胚形成的独立影响因素,基于独立影响因素的回归系数,使用R语言软件构建D5囊胚形成的列线图预测模型,通过受试者工作特征(ROC)曲线的曲线下面积(AUC)及Hosmer-Lemeshow检验评价模型的区分度与校准度。结果 多因素logistic回归分析显示,女方年龄、抗苗勒氏管激素、受精方式、第3天(D3)优质胚胎率、行囊胚培养的D3胚胎数为新鲜周期D5囊胚形成的独立影响因素,训练集和验证集ROC曲线的AUC分别为0.828(95%CI:0.802~0.853)与0.818(95%CI:0.779~0.857)。Hosmer-Lemeshow拟合优度检验结果显示,模型的预测概率与实际观测概率比较,差异无统计学意义。结论 新鲜周期D5囊胚形成的列线图预测模型可为临床医生提供参考,有助于在临床工作中更好地实施单囊胚移植。

阻尼复合板粘黏剂涂抹区域隔声优化

研究一种基于划分粘黏剂涂抹区来实现的阻尼复合板隔声优化方法。首先,以铝板和木质胶合板为基板,基于混合有限元-统计能量分析(Hybrid FE-SEA)法建立其阻尼复合板隔声量预测模型;随后,通过模态贡献度分析与振型分析相结合,划分出粘黏剂涂抹区域。与传统的全区域涂抹粘黏剂相比,优化后两组复合板的计权隔声量提升0~0.1 dB,平均隔声量上升0.05 dB~0.2 dB,且粘黏剂使用量下降55%~70%,符合成本节约及轻量化设计原则,具有工程实用意义。

Studies on the in vitro fertilizaion in cattle

The in vitro maturation, fertilization and development of bovine ovary oocytes in two differentcultural systems A and B were studied under the conditions of 38.5℃,5%CO2,95%air and 100%humidity.The maturation rates were 94.5%and 91.3%,respectively,and the difference wasextremely significant.Frozen semen were thawed and sperm were capacitated with three kinds ofcapacitation agents for fertilization.The pronucleus rates were 76%,65%-68%and 62%respectively.The rates of embryos developed to morula and blastocyst were 19%,16% and 17%respectively.The developmental rates of embryos cocultured with bovine oviductal epithelium cellsand bovine granulosa cells were 25% and 23.4% respectively,with no significant difference. Freshembryos were transplanted into 15 recipicns,and three of them were pregnant and calves were bornin 1990 and 1991.The pregnant rate was 20%.The emryos developed faster before 8-cell stage andslower after 8-cell stage,in vitro than in vivo.