荧光定量PCR与ELISA法检测HBV-DNA结果分析

目的 :应用荧光定量PCR方法精确检测HBV -DNA的拷贝数 ,为临床判断病毒复制程度提供指标 ;对比分析荧光定量PCR方法和ELISA方法检测HBV -DNA的结果。方法 :用荧光定量PCR法检测 10 14例用ELISA法诊断为乙型肝炎病人的血清HBV -DNA拷贝数。结果 :10 14例病人中 ,病毒拷贝数≥ 1× 10 5的 4 99例 ,阳性率4 9.2 % ;HBeAg阳性患者的HBV -DNA拷贝数≥ 1× 10 5的阳性率显著高于HBeAg阴性患者。结论 :荧光定量PCR检测HBV病毒复制情况结果准确 ,对临床工作指导意义更大 ;HBeAg是一项重要指标。     

放射性核素人体全身骨显像及其定量分析

对12例非恶性肿瘤和骨性疾病患者(对照组）全身不同部位骨显像和43例恶性肿瘤患者的异常浓聚区进行定量分析。结果表明，对照组两侧相应部位的放射性比值（H值）约为1.05。若以阳性判断际准，43例恶性肿瘤患者138处病灶中有135处为阳性（9738％）。应用ROI计算H值不仅为骨显像的评价提供了客观的定量指标，而且提高了对鼻咽、胸骨、骶椎等处病变诊断的准确性。     

Does the shunt opening pressure influence the effect of shunt surgery in normal pressure hydrocephalus?

Summary Thirteen patients with normal pressure hydrocephalus were operated upon with an externally manoeuvrable shunt system (Sophy SU8) in order to investigate its influence on clinical outcome, intracranial pressure and cranial CT parameters. The opening pressure was set at high at surgery and lowered stepwise at intervals of three months to medium and low. The clinical condition, intracranial pressure and cranial CT parameters were examined at the end of the 3 months interval on each pressure level.The patients improved within the first 3 months inspite of an unchanged mean intracranial pressure and remained in a stable clinical condition during the rest of the study period. The intracranial pressure was significantly reduced at 9 months. The ventricular index, Evans index, temporal horn and third ventricle width were reduced 3 months post-operatively and did not change significantly during the rest of the study. The pre-operative third ventricle width was correlated to high psychometric test results after shunt surgery. Reduction in ventricular index, Evans index and third ventricle width after surgery correlated to improvement in psychometric scoring.The clinical improvement after shunt surgery for normal pressure hydrocephalus is seen within 3 months and is independent of the adjusted valve pressure.     

重油和沥青中饱和碳的定量估计

建立了较完整的估计重油和沥青中饱和碳浓度数方法，其中包括环烷桥头碳、环烷甲基取代碳、环烷烷基（≥Ｃ２）取代碳等。基于理论分析，建立了估计环间的桥链和各种平均结构参数的方法，包括平均芳环环核数和环烷环环核数、芳环和环烷环烷工取代度、单元片上芳环和环烷环数。从实验数据出发，提出了烷基链长分布的公式。     

Ontogenetic Development of 5-HT1D Receptors in Human Brain: An Autoradiographic Study

The pattern of pre- and postnatal appearance of 5-HT_1D receptors throughout the different areas of the human brain was studied by quantitative in vitro autoradiography, using [¹²⁵I]GTI (serotonin O -carboxymethyl-glycyl-[¹²⁵I]tyrosinamide) as a ligand. The anatomical distribution of 5-HT_1D receptors in neonatal, infant and children's brain was in good agreement with that observed in the adult, the basal ganglia and substantia nigra being the most intensely labelled areas. The development of these receptors throughout the human brain was mainly postnatal: low densities of [¹²⁵I]GTI binding sites were observed at the fetal/neonatal stage in most regions analyzed, in contrast with the high levels of labelling found in infant and children's brains. Indeed, in a number of regions, including the globus pallidus, substantia nigra and visual cortex, a peak of overexpression of 5-HT_1D receptors was observed in the first decade of life. Such overexpression could support a regulatory role for 5-HT_1D receptors in advanced periods of the CNS developmental process. Our results also indicate that the administration of drugs acting on 5-HT_1D receptors during the early postnatal period of life could result in modifications of their properties, as these receptors are already functional in this period.     

川芎对脑血管血液动力学参数作用的实验研究

我们用食饵性高血脂加异种血清反复静脉注射造成动脉内皮免疫性损伤的方法,建立了兔实验性动脉粥样硬化模型,观察了中药川芎对脑血管血液动力学参数(CVHP)的影响。发现川芎组CVHP各项指标均与正常对照组接近,与正常组比较,无显著性差异,颈动脉平均血流量(Qmean)、平均血流速度(Vmean)、最小血流速度(Vmin)、脑血管零压顺应性(CO)和脑血管外周阻力(R)等指标显著优于动脉粥样硬化组(P<0.05～0.01)。本实验结果提示川芎对脑血管功能具有保护作用。     

Interaction of glucagon with artificial lipid bilayer membranes

The enhancement of fluorescence emission from the tryptophan residue of glucagon, the quenching of that emission with acrylamide and with 5-doxyl and 16-doxyl stearic acid, circular dichroism spectra, the release of 6-carboxytluorescein, and polarized infrared attenuated total reflection (IR-ATR) spectra were used to study the interaction of glucagon with intact lipid vesicles and flat bilayers. Dimyristoylphosphatidylcholine bound the peptide only below the main transition temperature, thus confirming earlier results of Epand et al. (1977). However, the peptide is also bound by vesicles of unsaturated lipids above their transition temperature, suggesting an influence of lipid area on the binding process. Circular dichroism showed that binding to such vesicles also increases the helix content of glucagon. The IR-ATR study and a comparison with dynorphin-A-(I-13)-tridecapeptide revealed profound differences in orientation of the two peptides. The dichroic ratios and the derived order parameters indicated an isotropic orientation of the helical segments of glucagon, but did not exclude a principal orientation of the molecules lying flat on the nienibrane surface. In contrast, the axis of the dynorphin helix is clearly oriented normal to the interface. The two peptides also differ in their rates of 6-carboxyfluorescein release, suggesting a deeper penetration of the primary amphiphilic helix of dynorphin A-(I-13) than of the secondary amphiphilic helix of glucagon.     

Association and linkage with quantitative traits

This paper examines two approaches for the analysis of quantitative traits: (1) association studies and (2) linkage studies. The trait studied was Q1 from simulated Problem 2 data set in Genetic Analysis Workshop 9. Our purpose was to evaluate associations present in the data, to identify nongenetic and genetic predictors of the trait, and to explore the simulated genome for linkage. Through the association study, we found evidence for the primary major gene associated with this trait. The linkage study found evidence of residual genetic effect acting through other traits. Adjustments of Q1 for Q2 and Q3 led to a failure to find significant effects of MG2 and MG3. This supports the suggestion that adjustment for genetically influenced traits for effects of other genetic traits can reduce the power to detect major gene effects. In summary, we detected the major gene directly associated with the trait of interest through association studies. Linkage analysis detected evidence for two other genes associated to a lesser degree with the trait. © 1995 Wiley-Liss, Inc.     

Quantifying arbitrary magnetic susceptibility distributions with MR.

Magnetic susceptibility, as a physical property of materials, plays important roles in many physical, chemical, engineering, and medical applications. Its quantification becomes of significant interest when MRI becomes a commonly used technique in biomedical applications. A general method is presented here for quantifying arbitrary magnetic susceptibility distributions in a localized region on the basis of first principles of magnetic induction field distributions in space. A proof of the concept was demonstrated by computer simulations. The study establishes the methodological basis for quantitative magnetic susceptibility imaging with MR.