异甜菊醇钠对大鼠心脏功能的保护效果

以大鼠心脏发生心肌梗塞为实验条件,深入研究异甜菊醇钠溶液对于大鼠心脏功能的保护效果.在研究过程中,设置3种质量分数的异甜菊醇钠溶液,配置5组实验用大鼠.实验结果表明:对于最大舒张力、最小舒张力、左心室松弛时间常数指标, LAD结扎手术后未送药会有上升和下降,送药0.5 mg/kg的STVNa时最接近正常值,说明较高质量分数的异甜菊醇钠溶液可以改善这些指标.无论对于常见的心脏功能指标,还是心电图中的ST波段和QT波段指标,异甜菊醇钠溶液都可以对心肌梗塞后的心脏功能起到一定的保护作用.     

原子核内的夸克分布：Ⅱ 原子核的遮掩效应

本文讨论了原子核遮掩效应对EMC效应可能的贡献.根据众多的实验数据构造了一个能较好地描述遮掩效应的唯象关系,这一关系与通常人们表述遮掩效应的方法不同,是用通常结构函数的变量来表示的.     

集值渐近非扩张型映射的不动点定理

本文首先给出了集值渐近非扩张(型)映射的概念,在Hilbert空间中证明了连续集值渐近非扩张型映射的遍历收敛性定理。     

经腹贲门癌切除、纵膈内机械吻合的手术配合

目的：介绍经腹贲门癌切除，纵膈内机械吻合术治疗贲门癌的手术配合。方法：针对44例有糖尿病，高血压，心功能不全的贲门癌患者，采用经腹切除，纵膈内机械吻合术，根据手术配合经验，介绍了手术护士配合的详细步骤与方法，强调心理护理的重要性。结果：手术均获得成功，患者安全返回病房。结论：手术中护士的配合是重要的，尤其是使用吻合器的配合。     

Gene product expression of cyclin D<Subscript>2</Subscript> and p16 during the transition from cardiac myocyte hyperplasia to hypertrophy

The current study was to investigate mRNA expression of cyclin D₂ and p16 during the transition from cardiac myocyte hyperplasia to hypertrophy. Cultured cardiac myocytes (CM) and fibroblasts (FC) obtained from 1-day-old Sparague-Dawley rats were used in this study. We have determined (1) hyperplasia by cell growth curve and fluorescence activated cell sorting (FACS); and (2) ultrastructure by electron microscope observation; and (3) expresions of cyclin D₂ mRNA and p16 mRNA by using in situ hybridization and image analysis. The results were shown (1) Results of cell growth curve and FACS analysis showed CM could proliferate in the first 3 cultured days (4 days in postnatal development). But the ability decreased quickly, concomitant with the differentiation. (2) The ultrastructure of CM showed the large amount of myofilaments and mitochondrion and FC showed moderate amount of rough endoplasmic reticulum. (3) The expression of cyclin D₂ mRNA in 3−, 4−, 5−day CM group was 0.89 times (p<0.05), 0.80 times (p<0.05) and 0.56 times (p<0.01) of that in 1-day group respectively. P16 mRNA in 2−, 3−, 4−, 5−day CM group were 1.63 times (p<0.01), 1.72 times (p<0.01), 1.99 times (p<0.01) and 2.84 times (p<0.01) of that in 1−day group respectively. It can be concluded that cultured neonatal rat cardiac myocytes could proliferate during the first 3 cultured days, but the ability of proliferation decreased, from the fourth day, concomitant with differentiation. Cyclin D₂ and p16 have the key roles during the transition from myocyte hyperplasia to hypertrophy. Biography: Zhang Yu-xia (1974-), female, Master, research direction: cardiovascular pathology.     

Cell-to-cell coupling studied by diffusional methods in myocardial cells

Summary The diffusion of large molecular substances from cell to cell in multicellular and enzymatically isolated cell pairs is described. Permeability of the gap junctional membrane to these molecules and the critical diffusing diameter of the myocardial gap junctional channel are discussed.     

Ventricular fibrillation threshold during acute ischemia in hypertrophied rat hearts

Summary Ventricular fibrillation threshold was significantly lower in hypertrophied hearts than in normal hearts. Ischemia produced by coronary occlusion reduced fibrillation threshold in both normal and hypertrophied hearts, but the maximum reduction in fibrillation theshold was observed earlier in hypertrophied hearts.     

实用的测量冠状动脉直径的算法

本文论述一种用于心脏动脉造影图象中测量冠状动脉直径的计算机算法,已在VAX-II/750机上成功地处理了冠状动脉造影图象,并得到了满意的结果。处理的主要步骤有:1.在预处理基础上对病灶血管段定位并确定处理程序运行时将需要的参数(即累积判断步长长度m);2.跟踪病灶血管段的主轮廓,抽取该血管段的中心线,最终测得该血管段各处的相对直径。     

扩散半群关于Lipschitz常数的压缩性

使用耦合方法研究扩散半群关于Ｌｉｐｓｃｈｉｔｚ常数的压缩性，所获结果广于Ｈｅｒｂｓｔ和Ｐｉｔｔ的相应定理，并在一些简单情形优于他们的估计。     

Banach空间中一迭代序列及其耦合不动点

GUO Da-jun教授等在《非线性算子耦合不动点与应用》一文中对某些算子引入了全连续混合单调算子的耦合不动点的概念，得到了极小，极大耦合不动点及其相似，本文建立了一迭代序列，将其结果推广到更广泛的一类映射－半紧1－集映射，并削弱了紧性和全连续的条件，得到了乘积空间中的极小，极大耦合不动点定理。