宫颈环扎对子宫畸形所致复发性流产的疗效评价

为探讨经阴道宫颈环扎术治疗子宫畸形所致复发性流产的疗效,将诊断为子宫畸形的复发性流产40例患者分为2组,21例经阴道行宫颈环扎术为治疗组,19例不愿行手术治疗的患者为对照组,观察2组的妊娠结局.结果发现,术后妊娠结局治疗组有效率为90.47%,对照组有效率15.79%,治疗组有效率明显高于对照组,差异有统计学意义(P＜0.05).经阴道宫颈环扎术是治疗子宫畸形所致复发性流产安全有效的方法.     

关于内有限群的性质

研究了非交换的内有限单群,得到了非交换的内有限群的一些特殊性质.特别得到了:设G是由a和a′生成的非交换的内有限群,且G是类正规的,则a和a′都不是对合.     

不动点集为Dold流形P(2,15)的对合

为了研究不动点集为Dold流形的对合的等变协边分类,针对一个特定的Dold流形F=P(2,15),确定了以F为不动点集的所有带对合的流形(M,T)的等变协边分类。首先,给出了P(2,15)上切丛和法丛的Stiefel-Whitney示性类。其次,根据Kosniowski-Stong定理,构造合适的对称多项式函数,出现矛盾,证明假设错误,对合不存在;或者证明对任意对称多项式函数都满足Kosniowski-Stong定理,说明对合的存在性。最后,得到以P(2,15)为不动点集的对合(M,T)协边。结果表明,存在以F=P(2,15)不动点集的对合,且能够确定对合的等变协边分类。研究结果推广了不动点集为F=P(2,n)(n=1,3,5)的对合的研究结论,丰富了不动点集为Dold流形的对合的等变协边分类问题,也为研究不动点集其他特殊流形的对合提供了借鉴和参考。     

交换整环上正交群的双反射性

证明了一定条件下交换整环上的正交群是双反射的。     

幂合变换与幂合矩阵

把满足A3=A的矩阵A叫做幂合矩阵,满足A3=A的线性变换A叫做幂合变换.显然,幂和矩阵(变换)是幂等矩阵(变换)和是对合矩阵(变换)的统一和推广.讨论了它们的性质,并给出了它们的等价条件.     

关于微商共同作用在带有对合的半素环的某些特殊多线性多项式上的结果(英文)

本文讨论了微商共同作用在带有对合的半素环的某些特殊多线性多项式上的问题。给出了，假设了R是带有对合的特征不为2的素环，f（X1,X2，…，Xn）是R的扩张形心C上的非中心值的多线性多项式，d，δ是R的微商。如果f（X1,X2，…，Xn）的各单项式的系数之和（记为fsc）不为零，d（fsc）=δ（fsc）且在R的边上是中心值的。那么或者d＝δ＝0或者R满足SA。同时给出在R的迹上中心值时的结果。另外也讨论了半素环上满足这些条件的结果。     

Mechanism of age-dependent involution in embryonic chick notochords

To study the possible mechanism of the age-dependent involution of the notochord, isolated mesenchymefree notochords of chick embryos were cultured in vitro and compared with their counterparts in vivo. Two different aspects were evaluated: (1) DNA synthesis measured by [³H]thymidine incorporation and visualized by autoradiography and (2) cell death quantified by counting the number of pyknotic nuclei. The results demonstrate that [³H]thymidine uptake by notochords shows an age-dependent decrease in vitro as well as in vivo. The number of [³H]thymidine-labelled notochord cells, however, is higher in vitro than in vivo. At the same time, there is an age-dependent increase in pyknosis in the notochord in vivo and in vitro. So, during the aging process, the number of both pyknotic nuclei and of [³H]thymidine-labelled nuclei suggest a high turnover of notochord cells in vitro. From these results, we can conclude that the process of involution in aging notochord seems to be controlled by a programmed intrinsic process, which might be influenced partially by the microenvironment in vivo.     

小波变换在体表子宫电信号降噪处理方面的应用

主要讨论了小波变换在体表子宫电信号降噪处理方面的应用，提出了一种基于多孔分解，采用非对称滤波器的降噪算法，与经典降噪技术相比，该方法不仅简单，能够快速实现，而且在抑制EHG信号中的噪声方面取得满意结果。     

Hermitian矩阵几何与保秩1的加法满射

设D是有对合的除环,介绍D上Hermitian矩阵几何研究的新结果,证明如果ψ是从D上n(n≥2)阶Hermitian矩阵空间到自身的保秩1的加法满射,则ψ是保粘切的双射.从而由Hermitian矩阵几何基本定理立刻得到ψ的公式.     

Dehydroepiandrosterone sulfate-binding sites in plasma membrane from human uterine cervical fibroblasts

Dehydroepiandrosterone sulfate (DHA-S) plays a critical role in cervical dilation at labor. Incubation of cervical fibroblasts with [³H]DHA-S caused a rapid and saturable increase in cellular radioactivity: an apparent equilibrium was reached by 2 min. There was no detectable conversion of DHA-S into DHA or oestradiol. When the fibroblasts loaded with [³H]DHA-S were homogenized and fractionated, the specific radioactivity in the plasma membrane fraction was enriched approximately 8- to 9-fold compared with the whole homogenate; only low amounts of radioactivity were observed in the other subcellular fractions. The binding of DHA-S to plasma membrane preparations showed saturation kinetics with an apparent equilibrium dissociation constant (K _d) of 12 nM, and the binding capacity (B _max) was calculated to be 1.25 fmol/mg protein. Neither DHA nor oestrone sulfate affected [³H]DHA-S binding to the plasma membrane. The plasma membranes of skin fibroblasts did not show specific binding sites for DHA-S. These findings demonstrate the presence of specific binding sites for DHA-S in the plasma membrane of cervical stroma cells. The fetal adrenal steroid may exert its action on cervical ripening at least in part through membrane-associated binding sites, or receptors.