高肺容积部分平均通过时间的测定方法和临床意义

介绍了用力呼气肺量图高肺容积部分平均通过时间(MTTp-h)的测定方法,并对100例正常人和94例气道阻塞疾病(支气管肺癌、喉癌和慢性支气管炎)患者进行了测定。初步认为MTTp-h对检测大气道和上气道阻塞敏感性较高,可作为协助临床诊断的实验室指标。     

基于MATLAB胎儿心电实时显示

文章介绍了从母亲体中采集到的心电信号，利用MATLAB软件对采集到的心电信号进行准确的数据实时处理，分离出胎儿心电（ECG）信号，实验结果表明，这种方法有一定的实用性。     

Polynomial matrix solution of H2 optimal control problem for state‐space systems

A polynomial matrix solution to the H₂ output feedback optimal control problems is obtained for systems represented in state‐equation form. The proof does not invoke the separation principle but is obtained in the z‐domain. The cost function includes weighted states, which allows the so‐called standard system model problem to be solved. This encompasses the class of inferential control problems. The results also enable the two‐degree‐of‐freedom optimal control solution properties to be explored. Copyright © 2002 John Wiley & Sons, Ltd.     

长效驱避剂的初步筛选研究

目的　研究一种对人有效保护时间 >8h ,且安全经济的长效驱避剂配方。方法　采用实验室 (GB T173 2 2 .10 -1998)和现场的药效测试方法对所配制的驱避剂配方进行效果测试。结果　实验室试验表明 ,以 2 0 %IR3 5 3 5配制 10、12、13、14号驱避剂配方在实验室内对白纹伊蚊的有效防护时间可达 8h以上 ;现场试验表明 ,10、12、13、14号驱避剂配方对人有效防止丘陵地区伊蚊的叮咬时间达 9h ,有效防止稻田地区中华按蚊的叮咬时间达 8h。结论以 2 0 %IR3 5 3 5与纤维素配制的驱避剂对人的有效保护时间可达 8h。纤维素对IR3 5 3 5有一定延长有效保护时间的缓释作用。实验所用配方对人的皮肤无不良反应 ,可作为户外活动人群防止蚊虫刺叮的驱避剂。     

Influence of muscle activation dynamics on reaction time in the elderly

The aim of this investigation was to determine whether age-related changes in the dynamics of muscle activation were, in part, responsible for longer reaction times (RT) in the elderly. A group of 12 young (mean age, 20.6 years) and 12 elderly (mean age, 64.3 years) women performed a series of ballistic forearm supination movements in response to an auditory stimulus while using a simple reaction time test. Surface electromyographic waveforms from biceps brachii (agonist) and pronator teres (antagonist) muscles were recorded, together with the angle-time curves representing the motion of the forearm, on to an IBM compatible microcomputer. The results showed that an age-related increase (P<0.05) in motor reaction time (MRT) contributed to longer RT in the elderly. In addition, the longer (P<0.05) MRTs in the elderly were associated with a significantly slower rate (P<0.05) of biceps brachii muscle activation and a significantly increased proportion (P<0.05) of the initial biceps brachii muscle burst required to initiate the movement. This data suggested that an important part of the slowing of motor behaviour, commonly observed with increasing age, may be due to either decreases in the ability of aged skeletal muscle to rapidly generate tension or to a reduction in motor drive.     

假腔内注射凝血酶治疗股动脉假性动脉瘤(附6例临床分析)

目的：探讨超声引导下假腔内注射凝血酶对股动脉假性动脉瘤的治疗效果。方法：对本科1999年9月－2002年8月行心脏介入诊疗后并发的6例右侧股动脉假性动脉瘤进行假腔内凝血酶注射治疗，并对其结果进行了分析。结果：6例患者均即刻治疗成功，未见明显并发症，随访30d无复，结论：假腔内注射血酶是一种安全，简便，快速，耐受性佳，经济和有效的治疗股动脉假性动脉瘤的方法。     

凝血酶受体结构与功能的研究现状

凝血酶（ｔｈｒｏｍｉｂｉｎ，Ⅱａ）是一种生成于损伤处血管内皮细胞多功能蛋白酶，它是参与凝血过程各个环节反应中的关键酶。在发挥止血作用的同时，还可能诱导炎症、增生及修复等反应。最近发现的凝血酶受体（ｔｈｒｏｍｂｉｎ ｒｅｃｅｐｔｏｒ，ＴＲ）分子可能为解释上述现象提供了一个理论框架。同时，ＴＲＮ端被Ⅱａ切下的４１个氨基酸片段是否具有特殊功效，值得研究探讨。     

Simple reaction time event-related potentials: Effects of alcohol and diazepam

1. 1. Acute effects of alcohol and diazepam on reaction time (RT) and event-related potential (ERP) measures were examined in 108 healthy male volunteers.

2. 2. The subjects engaged in a simple RT task at two levels of stimulus intensity during baseline and treatment sessions.

3. 3. Lower stimulus intensity produced increased RTs, increased ERP peak latencies, and suppression of peak amplitudes.

4. 4. Moderate and high doses of alcohol, and high doses of diazepam produced increased RTs. Alcohol suppressed P100 and N100 amplitudes, while diazepam suppressed P100 amplitudes only. P100 amplitudes were correlated to RTs under baseline and treatment conditions.

5. 5. These results were taken as evidence for impaired stimulus detection during alcohol and diazepam intoxication, with both drugs influencing sensory-perceptual processes and alcohol alone influencing the degree of attentiveness.

Optic nerve injury demonstrated by MRI with STIR sequences

We studied nine patients with optic nerve injury associated with closed head trauma by magnetic resonance imaging (MRI) with short inversion time inversion recovery (STIR) sequences on 11 occasions from 4 days to 14 years after the injury: three studies were within 17 days and eight over 4 months to 14 years. MRI revealed abnormal high signal in 10 of the 11 injured nerves. MRI 4 days after the injury showed no abnormality.