三级生物安全实验室空气指标的自动化控制

目的 实现三级生物安全(BSL-3)实验室各区域的压强梯度、温度与湿度等各项指标的动态平衡,保证工程屏障的生物安全防护作用.方法 设计了BSL-3实验室空气指标自动化控制系统.该系统在变送器及专用数据采集设备的基础上采用直接数字控制模式(DDC)控制,并设置图形监控系统.上位机可同时对各项指标进行实时记录存盘并分析处理,根据实时情况对相应输出设备进行调节,对超过设定限值的数据发出报警.结果 该系统能实时采集BSL-3实验室各区域、空调机组、空气过滤器等所有监控点的压力、温度、湿度、阻力、设备运行状况等模拟量信号和风机、电动执行器等的启停(运行)状态以及报警信息,以彩色动态仿真图形显示,并实时对设施的运行进行控制.监控中心可通过DDC控制器远程修改现场的控制参数,系统自动调节相关设备的输出量.监控中心自动执行警报,强制画面显示报警的环节和原因,工作人员可根据用户等级来处理报警信息.结论 该自控系统可实时有效地对室内环境指标状态以及设施的运行状况等进行监控,满足了实验室的生物安全要求.     

蛤蚧生态与生物学特性的研究

笔者通过对蛤蚧的野外调查和人工养殖观察，基本掌握了蛤蚧的地理分布、栖息环境，活动规律以及蛤蚧的繁殖习性和食性，为人工养殖提供了科学依据。     

Placental anatomy and diffusing capacity in guinea pigs following long-term maternal hypoxia

To determine the relation of placental structure to placental diffusing capacity (DPCO), we exposed Hartley guinea pigs to 12 or 14 per cent O2 from day 15 of gestation to near term (64 days). At that time we measured DPCO and fetal body and placental weights. In addition, we used stereological techniques to measure placental parameters important to diffusing capacity. We also used a mathematical model with results from the stereological measurements to predict the diffusing capacity. In the first hypoxic group (E1), measured DPCO decreased 10.1 +/- 3.7 per cent, while that predicted was 2.4 per cent less than control. Total vascular volume decreased 6.6 +/- 3.6 per cent, while tissue volume and mean diffusion distance increased 10.2 +/- 5.6 per cent and 12.9 +/- 7.0 per cent, respectively. In the pair-fed animals, measured DPCO decreased 22.6 +/- 4.6 per cent, while that predicted was 20.0 per cent less than control. There were no significant stereological differences in this group. In the second (E2) hypoxic group, measured DPCO increased 27.2 +/- 7.4 per cent, while that predicted increased 38.2 per cent. For this same group, total vascular volume increased 11.7 +/- 3.0 per cent, and tissue volume and mean diffusion distance decreased 18.2 +/- 4.6 per cent and 17.8 +/- 3.8 per cent, respectively. These results demonstrate the dependence of placental diffusing capacity upon placental structure.     

How Important Are Brain Banks for Alcohol Research?

This article contains the proceedings of a symposium at the 2002 RSA/ISBRA Meeting in San Francisco, organized and chaired by Clive Harper and co-chaired by Izuru Matsumoto. The presentations were (1) Introduction, by Clive Harper; (2) The quality of tissue-a critical issue, by Therese Garrick; (3) The first systematic brain tissue donor program in Japan, by Izuru Matsumoto; (4) Brain scans after death-really! by Adolf Pfefferbaum, Elfar Adalsteinsson, and Edith Sullivan; (5) Capture that (genial) expression, by Joanne Lewohl and Peter Dodd; and (6) Neurochemical/pharmacological studies: experimental design and limitations, by Roger Butterworth.     

计算机辅助教学在机能实验教学中的应用

机能实验室普遍采用生物信号采集系统计算机辅助教学，教学水平明显提高，但计算机辅助实验教学也给我们带来了新的问题与挑战。本文结合广州医学院6年的教学实践，分别从生物信号采集系统的选择、教材与实验项目的选择、教师及技术人员的管理、网络化实验室及开放实验室等五个方面介绍了我们的经验。     

病原生物学精品课程建设的探索与实践

目的做好病原生物学精品课程的建设工作。方法从师资队伍、教学管理、教学内容、教学方法、课程文化等方面进行了探讨和实践。结果精品课程的建设工作取得了显著的成效。结论课程建设是衡量学校办学水平和教学质量的重要标志,是实现人才培养目标的基本保证。     

山瑞鳖的生物学特性及人工养殖技术

本文介绍山瑞鳖的生物学特性及人工繁殖技术,为人工养殖提供了有用的信息。     

Expression systems for cloned xenobiotic transporters

One challenge of modern biology is to be able to match genes and their encoded proteins with events at the molecular, cellular, tissue, and organism levels, and thus, provide a multi-level understanding of gene function and dysfunction. How well this can be done for xenobiotic transporters depends on a knowledge of the genes expressed in the tissue, the cellular locations of the gene products (do they function for uptake or efflux?), and our ability to match substrates with transporters using information obtained from cloned transporters functioning in heterologous expression systems. Clearly, making a rational choice of expression system to use for the characterization and study of cloned xenobiotic transporters is a critical part of study design. This choice requires well-defined goals, as well as an understanding of the strengths and weaknesses of candidate expression systems.     

Epidemiology and biology of nematodofauna affecting Testudo hermanni, Testudo graeca and Testudo marginata in Italy

Tortoises of the genus Testudo living in Italy are Testudo hermanni, Testudo graeca and Testudo marginata. Although a great deal of information has been acquired on the internal medicine and surgery on these animals, little is known of their parasitological fauna. A survey on the presence of gastro-intestinal parasitic nematodes in tortoises bred in Italy was carried out to acquire extensive epidemiological data. Stool samples of 62 tortoises (37 T. hermanni hermanni, 13 T. graeca, 6 T. hermanni boettgeri and 6 T. marginata) were macroscopically examined and subjected to qualitative (flotation and Baermann techniques) and quantitative (McMaster technique) microscopic examinations. Adult nematodes were identified using morphological keys. Eggs of oxyurids (species indistinguishable) and adults of Alaeuris numidica, Mehdiella microstoma, Mehdiella uncinata, Tachygonetria longicollis, Tachygonetria conica and Tachygonetria palearcticus (Oxyurida, Pharyngodonidae); larvae and adults of Atractis dactyluris (Ascaridida, Atractidae); and eggs and adults of Angusticaecum holopterum (Ascaridida, Ascarididae) were identified in all animals >1 year, whereas all tortoises <1 year of age were parasite-free. Moreover, this study reports for the first time A. numidica and M. microstoma in T. marginata. This work shows that nematodes affecting tortoises are diffused in Italy and highlights the need to investigate their epidemiology more in depth.