脊神经节神经元周围突至肾及体壁的分支投射

实验将快蓝(FB)和核黄(NY)分别注入大鼠左肾纤维膜下及左体壁神经干内,结果在荧光镜下发现左T_(9-13),L1脊神经后根节(DRG)内存在双标记细胞,提示大鼠T_(9-13),L1段DRG内的部分神经元的周围突分支支配肾及体壁,为肾绞痛所致牵涉痛的解释,提供了神经解剖学基础。     

Counter Intuitive Relations Between in vivo RF Lesion Size, Power, and Tip Temperature

Background: Radiofrequency (RF) lesion size in vitro is positively correlated with applied power and catheter tip temperature. However, the relation between RF lesion size, power, and tip temperature in vivo remains unclear. We hypothesized that due to flow, anatomy and tip contact effects in vivo, increased tip temperature would be inversely related to applied power and RF lesion size. Methods: RF lesions were created on the endocardium of 16 pigs using 5, 6, and 7 Fr catheters. The ablation generator was set to achieve a temperature of 70°C. RF lesions were created in different regions of the heart so as to encompass a wide range of blood flow and catheter movement conditions. RF lesions were measured acutely (DIMEN, mm) and correlated with average power applied (POWER, W), and average tip temperature (TEMP, °C). The POWER and TEMP relation was also examined. Results: For TEMPs below 55°C, the power output from the generator was typically maximized at 50 W. At TEMPs above 55°C, POWER decreased exponentially with increasing TEMP {POWER = 50 – exp(-((41-TEMP)/7)), r = 0.98, p < 0.05}. Further, DIMEN tended to be inversely related to TEMP (Slope: –0.07 ± 0.04, r = –0.15, p = 0.07); but, was positively related to POWER (Slope: 0.04 ± 0.02, r = 0.23, p < 0.05). These relations varied by tip size and estimated local blood flow characteristics. Conclusion: In vivo, variable tissue contact and flow yield DIMEN-POWER-TEMP relations opposite to those found in vitro. These counterintuitive results suggest that maximum in vivo RF lesion size is achieved when power is maximized at tip temperatures between 50 and 60°C.     

Evaluation of renal first pass blood flow with a functional image technique in hypertensive patients

The renal circulation of patients with essential hypertension and renovascular hypertension was evaluated using ^99mTc-DTPA. The first renal peak count (the first C_max; FC_max), time phase distribution (the first T_max; FT_max), and blood velocity (the FC_max/FT_max) were calculated by digital imaging. This yields a visual image of the renal circulation. We consider that the increase in the renal first pass blood flow in patients with essential hypertension is best observed pixel by pixel. The FC_max and FC_max/FT_max images before and after treatment by percutaneous transluminal renal angioplasty in patients with renovascular hypertension clearly show its therapeutic effect. The FI technique, therefore, has the advantage that it can be performed at the same time as the conventional routine examinations of renal function. This makes it very useful clinically.     

谈《正常人体学基础》教材及教学方法改进

本文介绍了《正常人体学基础》教材的特点,讨论了本学科教学应注意的问题,强调了要充分地使用标本模型、挂图及多媒体教学,讨论了本学科的学习方法.     

两种根管弯曲度测量法间数学关系的推导

目的:研究2种根管弯曲度测量法测值(Schneider法的测值为θS,Weine法的测值为θW)间的数学关系。方法:将弯曲根管长轴简化为依次由相切的线段(长度为l1)、圆弧(半径为r、圆心角为θ)、线段(长度为l2)组成的连线,根据2测量法确定简化弯曲根管长轴测量角时不同的定点、连线方式,推导θS、θW间的函数方程以及与l1、l2、r、θ间的数学关系,分析方程与函数图形的特征。结果:θS与θW间存在以下数学关系:(1)tanθS=(1-cosθW ksinθW)/(sinθW kcosθW),k=l2/r;(2)θW/2≤θS≤θW。k取不同值时函数曲线的形态具有不同的特点。θW在0,π的区间内,θS与θW间呈近似的线性关系;k越大,θS越接近θW,k越小,θS越接近θW/2。结论:Schneider法与Weine法测值间存在着复杂的函数关系,根管根尖部直段的长度(l2)与弯曲段曲率半径(r)之比值是影响2种方法测值间差异的重要因素。     

Optimization of self-reference thermometry using complex field estimation.

Referenceless, or self-reference, thermometry is a technique for mapping temperature differences in the region of interest (ROI) using the baseline phase estimated by extrapolating the field in the surrounding region for estimation (RFE) and subtracting the estimated baseline from the measured field. In the present work a self-reference technique based on complex field estimation using 2D polynomials comprising complex-valued coefficients was proposed and optimized. Numerical simulations with a Gaussian-profiled phase distribution demonstrated that the ROI radius had to be 2.3-2.5 times the standard deviation (SD) of the Gaussian function in order to keep the error below 8% of the peak phase change. The area ratio between the ROI and the RFE had to be larger than 2.0 to maintain the error level. Based on the simulations, and phantom and volunteer experiments, the complex-based method with independently optimized polynomial orders for the two spatial dimensions was compared with the phase-based method using the similar-order optimization strategy. The complex-based method appeared to be useful when phase unwrapping was not removed. Otherwise, the phase-based method yielded equivalent results with less polynomial orders.     

相对湿度对空调环境至适温度影响的研究

本文研究空调室内相同温度（夏季：２４℃，２８℃：冬季：１９℃；２２℃）条件下相对湿度（分别为３０～７０％；８５～９５％）对至适温度的影响。以健康成年人为研究对象，以体温、皮温、皮温差、温热感和舒适感为观察指标。结果表明：空调室内气温相同时，皮温差、温热感、舒适感均随气湿不同而出现差异。夏季空调温度为２８℃、气湿为８５～９５％时，皮温差（２．１℃）已超出生理至适范围，温热感（１２．５％）和舒适感（０％）也随湿度增高而下降（Ｐ＜０．０１）。提出在制订空调至适温度卫生标准时，应考虑空气湿度对至适温度的影响。     

苹果常温保鲜技术

采用AF型气氛保鲜纸对苹果进行常温保鲜效果试验,并与其他保鲜方法进行了对比试验.该法具有简单易行、投资少、见效快等特点,可用于苹果常温贮藏保鲜.结果表明,用AF型气氛保鲜纸包裹苹果,可使苹果在常温下贮藏保鲜期稳定在140 d以上,失重率降低66.9%,皱皮率降低90.6%,腐烂率降低87.3%,硬度和可溶性固形物含量基本不变.     

肝病患者血清中总胆汁酸测定的意义

采用全自动酶法分析法 ,测定 32 1例各种肝病患者血清总胆汁酸 (TBA)。结果表明 :血清总胆汁酸是一种较灵敏的肝功能指标。在各类肝病中 ,尤其是急性肝炎、肝硬化、肝癌患者的总胆汁酸 (TBA)浓度均明显高于正常对照组 (P<0 .0 1) ,并在肝功能常规指标改变不明显时对肝脏疾病的诊断有一定的价值     

包头市区400名健康成年人发硒值测定

报告用巯基棉（ＳＣＦ）吸附富集分离──催化动力学法，测定了包头市区４００名１８～５５岁健康成年人发硒值。结果显示：发硒值的中位数（Ｍ）为０．７６ｍｇ／ｋｇ。男女分组分析，男性的Ｍ为０．６９ｍｇ／ｋｇ，女性Ｍ为０．８０ｍｇ／ｋｇ，男女两组间的差异无显著意义（Ｐ＞０．０５）。