AlEtCl2／t—BuCl引发α—蒎烯阳离子阳合的反应研究

在实验室绝热反应器中进行了乙苯脱氢制苯乙烯的反应动力学研究。根据不同反应机理，提出五种反应模型，经残差分析及模拟计算规律与实验规律的比较，确定Ｃａｒｒａ双曲模型为最佳反应动力学模型。通过对实验数据的回归拟合，经参数估计求得了速率方程的频率因子和活化能。     

脐疗配合耳穴贴压治疗便秘26例

目的 探讨济疗配合耳穴疗法对便秘的疗效。方法 将50例便秘患随机分成两组，治疗组用济部药物贴敷配合耳穴贴压治疗；对照组单纯用于穴贴压治疗，所获数据采用t检验。结果 治疗组有效率96．15％，对照组有效率83．33％，经统计学处理，P＜0．01，有显性差异。结论 济疗联合耳穴贴压治疗便秘疗效较单纯耳穴贴压效果好，且简单方便，无副作用。     

对CT所见腰椎间盘突出的重新鉴别与治疗观察

目的：因临床发现有些经ＣＴ检查有腰椎间盘突出的患者，其症状体征与ＣＴ结果不符。对１１２ＣＴ阳性者根据症状体征进行重新鉴别。方法：将ＣＴ阳性者根据“三种试验”分为阳性、阴性两组，再选压痛点作注射治疗。结果：两组治疗结果阴性组优良率较高。结论：ＣＴ结果可供参考，但不能作临床考虑的主要依据。对腰椎间盘突出症的诊断与治疗要以症状体征为主     

耳穴压豆法治疗儿童哮喘50例

采用耳穴压豆法治疗儿童哮喘５０例，并随访１年。结果：痊愈１１例；好转３７例；无效２例，总有效率为９６％。认为此法不仅能预防哮喘的发作，还能避免药物引起的副作用。     

336例创伤数据对中国人创伤评分权重系数的评价

目的为了评价国内对ＴＲＩＳＳ评分权重系数的修订，对３３６例创伤患者分别用国外权重和国内权重评定伤情后进行比较。方法３３６例采用ＴＲＩＳＳ法计算生存概率Ｐｓ，所需权重分别采用新近报道的国内权重和国外ＭＴＯＳ权重。Ｐｓ≥０．５预测生存，Ｐｓ＜０．５预测死亡，将预测生死与实际生死结果进行比较。结果中国人权重在敏感性和区别度方面高于国外权重，误判率低于国外权重。结论中国人权重对中国人的创伤程度评估有价值，为进一步精确修订权重，建议建立大型中国人创伤数据库     

A framework for automatic analysis of the dynamic behaviour of coronary angiograms

A framework for coronary vessels analysis in digital subtracted angiograms is described. This method combines the motion estimation with the frame-to-frame structure detection in a natural way such that they act interactively. The first step consists of the extraction of the vessel centrelines in one image and their organization into meaningful constituents or branches of the coronary arterial tree. The motion is then estimated along the centrelines through a gradient based method. These motion estimates supply an initial positioning of an active contour model (or snake) in the next image. This model adapts itself by changing its shape to accurately fit onto the new centrelines. This process is then reiterated on the subsequent images to depict the dynamic behaviour of all the relevant branches. The main interests of this scheme are: (1) the active models operate locally so a fast detection of the vessels can be performed; (2) the centrelines extraction is fully guided by the confluence of the motion estimation and the contour model; (3) both morphological and kinetic features are provided on a quantitative basis.     

Elongation of the cytoplasmic domain,due to a point deletion at exon 7, results in an HLA-C null allele,Cw*0409 N

The development of molecular techniques for HLA typing has allowed the identification of genes previously assigned as serologic blank alleles. Lack or poor cell surface expression has been found for molecules coded by HLA-A, -B, -DRB4, -DRB5, and -DPB1 genes. In this report we describe the first HLA-C gene encoding for a null cell surface molecule. HLA-Cw*0409 N shows a point deletion at position 1095 within exon 7. This mutation provokes a codon reading shift, generating a new translation stop codon 97 bp downstream to that described in alleles normally expressed. This new stop codon location implies the presence of 32 extra amino acid residues in the cytoplasmic domain. Transfection experiments suggest that elongation of the cytoplasmic domain in Cw*0409 N would be the cause of cell surface expression failure, although Cw*0409 N heavy chain is able to create stable complexes with beta2-microglobulin. HLA-C fragment length analysis in a small selected group of samples with B44-Cblk haplotypic associations allowed us to identify two additional subjects showing both a serologic silent Cw*04 allele and a point base deletion at the 3' end of the HLA-C gene. This finding indicates that the allele frequency of Cw*0409 N within serologic C blank alleles would be appreciable, although basically restricted to the (A23)-Cw*0409 N-B*4403-DR7-DQ2 haplotype.     

EXT1基因1633-26(C→A)突变可能致多发性外生性骨疣

目的研究1例散发多发性外生性骨疣患者的基因突变情况，确定其致病基因。方法采用聚合酶链反应结合DNA直接测序法检测EXT1以及EXT2基因的突变热点区域；并应用错配引物PCR扩增引入酶切位点结合限制性片段长度多态性方法检测和鉴定突变。结果经测序证实在患者EXT1基因的第7内含子3’剪接位点上游26bp处发现一杂合突变，此杂合突变不存在于其表型正常的父母双亲中，是一个新生突变；错配引物扩增与限制性片段长度多态性分析结果表明在150名家系外正常对照者中没有此突变。结论EXT1基因1633-26（C→A）突变可能是导致这个患者发生多发性外生性骨疣的致病突变。     

Quantitative Characterization of Epicardial Wave Fronts During Regional Ischemia and Elevated Extracellular Potassium Ion Concentration

This study applied zero-delay wave number spectral estimation as a means of quantifying the changes in activation and recovery sequences of propagating plane waves on the epicardial surface of in situ porcine hearts during regional hyperkalemia and ischemia. Unipolar electrograms (104) were recorded from the left ventricular surface of nine hearts using a plaque electrode array with 1 mm spatial sampling intervals. The objectives were (1) to define a set of parameters capable of quantifying the spatial and temporal changes in measured extracellular potentials associated with localized ischemia prior to the onset of conduction block; (2) to elevate regional levels of extracellular potassium ion concentration and quantify potential changes due to this known physiologic manipulation; and (3) to use quantitative parameters to make statistical comparisons in order to distinguish wave fronts during normal, ischemic and hyperkalemic conditions. Results showed that the parameters of wave number and average temporal frequency and the associated power, as determined from the wave number spectrum, provided statistically significant (p < 0.05) quantification of changes in wave front features during normal and ischemic or hyperkalemic conditions. The results were consistent with results obtained from conventional time–space domain methods like isochronal mapping and electrograms, with the advantage of a quantitative result enabling simple comparisons and trend analysis for large numbers of heart beats. © 1998 Biomedical Engineering Society. PAC98: 8759Wc, 8722Fy, 8780+s     

A morphological transition in the pleomorphic bacterium Ramlibacter tataouinensis TTB310

We provide microscopic evidence that motile rod-shaped forms of Ramlibacter tataouinensis TTB310 are formed from dividing cyst-like cells. Careful estimation of the size of the two morphotypes was conducted using optical and transmission electron microscopy (TEM). The cyst-like cell was shown to be a sphere with a diameter Dc=850 nm. The rod-shaped form was a round-ended cylinder with length Lr=2.91 microm and diameter Dr=239 nm. The membrane area of the two morphotypes was the same. However, the formation of rods from cysts involved loss of two-thirds of the cell volume. TEM showed that, prior to division and transition into rods, cysts contained condensed cytoplasmic material. These results suggest that the morphological transition occurs by pure reshaping of cells.