聚合酶链反应检测细菌16S rRNA基因

根据细菌１６ＳｒＲＮＡ基因的高度保守性,设计合成所有细菌、革兰氏阳性细菌及革兰氏阴性细菌的共同引物,采用聚合酶链反应检测已知细菌１３株,三对引物分别扩增的阳性率为１００％,倍比稀释法能检出细菌的最低浓度为４ＣＦＵ·ｍｌ－１,同时检测临床样本４０份,阳性率为６７５％（２７／４０）,同期细菌培养阳性率为４５％（１８／４０）,二者比较差异有显著性（Ｐ＜０．０５）。结果提示聚合酶链反应检测细菌１６ＳｒＲＮＡ基因具有高度的特异性和敏感性。     

Ginkgo biloba extract EGb761 reduces the development of amphetamine-induced behavioral sensitization: effects on hippocampal type II corticosteroid receptors

Pretreatment of rats with the extract of Ginkgo biloba termed EGb761 reduced the behavioral sensitization induced by successive -amphetamine administrations (0.5 mg/kg) as estimated by increasing values of locomotor activity. EGb761 pretreatment also prevented the reduced density of [³H]dexamethasone binding sites in the dentate gyrus and the CA1 hippocampal regions of -amphetamine treated animals. These observations suggest that EGb761, by reducing glucocorticoid levels, could modulate the activity of the neuronal systems involved in the expression of the behavioral sensitization.     

铝-铬天青-溴化十六烷基啶胶束增溶分光光度法测定血清铝的方法研究

在溶液p H6-5 ～5-5 范围内,铝铬天青S(CAS)溴化十六烷基吡啶(CPB) 生成兰色三元胶束配合物,它的最大吸收在618n m 波长,摩尔吸光系数ε为9-642 ×104L.m ol-1 .c m -1 。在铝含量0 ～6-0 ×10 -6m ol.L- 1,遵循比耳定律,AlCASCPB三元配合物的组成摩尔比是1∶2∶3 。一定量的抗坏血酸和盐酸羟胺可以消除血清中与铝共存的其它阳离子Fe3 ,Cu2 等的干扰。该方法的检出限为6-60 ×10 - 7mol .L-1 ,平均回收率(96-11 ±2-87) % ,相对标准差小于3 % 。方法简便易行,有较高的准确度和灵敏度,用于血清铝的测定可获得满意结果     

Population studies of three AMPFLPs systems in a North Polish population

Allele and phenotype frequencies for D1S80, D17S5 and ApoB were determined in a population sample of more than 200 unrelated persons from North Poland using the PCR method. For D1S80, D17S5 and ApoB 19, 13 and 21 alleles respectively were observed. No deviations from Hardy-Weinberg equilibrium were detected. All three systems have discrimination values above 92% and a cumulative discrimination index of 4.5 × 10⁴.Dedicated to Prof. Dr. J. Gerchow on the occasion of his 75th anniversary     

Polymorphism analysis of the VNTR locus D17S5 in Central Spain

The fragment length polymorphism YNZ22 (D17S5) was analysed for a sample of 207 unrelated individuals living in Madrid (Spanish Caucasians) using PCR-methodology and high resolution separation. Hardy-Weinberg expectations (HWE) were calculated after pooling alleles into four groups. No deviations from HWE were detectable using the conventional ²-test. The power of discrimination was estimated as 0.96 and the mean paternity exclusion chance as 0.7587. A comparison of the allele frequency distribution with those of other Caucasian groups revealed no major differences.     

Amacrine cells,bipolar cells and ganglion cells of the cat retina: A Golgi study

Neuronal types contributing to the inner plexiform layer of the cat retina are described based primarily on light microscopy of Golgi-impregnated retinal whole-mounts. Cells have been characterized on morphological criteria that include dendritic branching patterns, dendritic tree sizes, cell body sizes and stratification of processes in the inner plexiform layer. Nine different types of bipolar cell, 22 different types of amacrine cell and 23 different types of ganglion cell can be distinguished using one or more of these morphological criteria. The significance of the different morphological types of cells is discussed, particularly in relationship to the functional bisublamination of the cat inner plexiform layer.     

Specific staining of the axon membrane at nodes of Ranvier with ferric ion and ferrocyanide

Ferric ion and ferrocyanide were used as stains for light and electron microscopy of peripheral nerves. In rat sciatic nerves, it was found that ferric ion preferentially binds to the cytoplasmic surface of the axon membrane at nodes of Ranvier but not at internodal regions. In myelinated axons in the electric organ of the gymnotid fish, Sternarchus albifrons, the small excitable nodes are similarly stained, but the larger inexcitable nodes are not stained by ferric ion. Staining of the inner surface of the nodal membrane appears to be related to a structural specialization of this membrane, rather than accessibility to stain. Our data thus show a chemical differentiation of the inner surface of the axon membrane between nodes and internodes in normal peripheral nerve fibers and between the inner surface of the axon membrane at active nodes, inactive nodes, and the internodes in the Sternarchus electrocyte axons.     

Comparative surface thrombogenicity of implanted vascular grafts.

In order to study the comparative thrombogenicity of neointimal surfaces that develop with three types of vascular graft materials (ultralightweight knitted dacron, knitted dacron external velour, and expanded Teflon), 36 female mongrel dogs had their infrarenal aortas alternately replaced with one of the three grafts. At the end of 3 or 6 months, the grafts were removed and the surface thrombogenicity of the neointimal surface was determined. Each graft was examined visually and microscopically for evidence of “healing.” At 6 months the external velour graft is lined more frequently than the other two grafts. The external velour graft has a markedly better incidence of cellular healing noted microscopically than the other two grafts at both time intervals. While the expanded Teflon has an initially lower surface thrombogenicity (probably due to the characteristics of Teflon surface), at 6 months, the velour graft has the lowest surface thrombogenicity. This is most likely due to cellular healing. Of all the completely lined grafts at both time intervals, the surface thrombogenicity of the velour grafts was most like that of the normal aorta. The velour graft appears to develop the least thrombogenic neointimal surface while becoming most frequently healed with a cellular neointimal surface.