IMMUNOREGULATORY EFFECT OF PANAXATRIOL GINSENOSIDE ON IMMUNE FUNCTIONS IN BONE MARROW SUPPRESSED MICE

The effect of Panaxatriol Ginsenoside (PTGS) on Immune functions in bone marrow suppressed mice induced by injection of cyclophosphamide (CY) has been studied. Bone marrow suppressed mice were made by injection of CY (150 mg/kg) parenterally. Subcutaneous injection of PTGS three days earlier partially restored the number and the activity of bone marrow cells, significantly enhanced the production of IL-1, IL- 3 and IL- 6 like substances and promoted the reactivity of murlne spleen cells to Con-A In bone marrow suppressed mice.     

喷雾(冰冻)干燥法制备钠、锂快离子导体

对两种性能较好的快离子导体Na_3Zr_2Si_2P_3O_(12)(Nasicon)和Li_(1.8)Ti_(1.2)·Cr_(0.8)P_3O_(12)用喷雾干燥法和冰冻干燥法制备粉料和陶瓷烧结,并对样品进行了X射线衍射分析,形貌和显微结构观察以及阻抗谱测量等。实验结果表明:两种方法制备的粉料具有颗粒细,均匀性好,合成温度低等优点。在300℃时,两种样品的电阻半分别为10.05 Ω.cm和94.8 Ω.cm。激活能分别为0.25 eV和0.27ev。     

南岳毛尖抑制小鼠移植性S_(180)生长作用的初步研究

本研究用南岳毛尖(一级绿茶)浸泡液灌胃处理皮下移植S_(180)的Babl/c小白鼠,观察其抑瘤效果。结果表明该绿茶可明显抑制肿瘤的生长,瘤重明显轻于对照组(P<0.05);空泡变性瘤细胞数、瘤块内坏死灶数明显多于对照组(P<0.001);瘤细胞核分裂数明显少于对照组(P<0.005),对瘤细胞有较好的杀灭作用。该研究证明南岳毛尖是一种天然防癌抗癌物质,对干预肿瘤的发生和发展有重要意义。     

须恙螨作为肾综合征出血热宿主的初步调查及实验研究

通过本次流行病学调查和实验研究，发现须恙螨主要分布于肾综合征出血热流行区，其地理分布与疫区的病例分布基本一致。主要传染源黑线姬鼠鼠体带螨指数为２５．１；从鼠肺抗原阳性鼠体所采集的须恙螨幼虫和小黑板采集经叮刺吸食已感染本病病毒的小白鼠乳鼠体液后的游离螨幼虫，分别分离到１株病毒，证明须恙螨具备传播媒介的先决条件。     

Ca2+ mobilization in physiologically stimulated single T cells gradually increases with peptide concentration (analog signaling)

We have investigated Ca²⁺ mobilization in single T cells stimulated with their physiological ligand, i.e. antigenic peptide bound to major histocompatibility complex (MHC) molecules on antigen-presenting cells (APC). Fibroblasts expressing I-E^d class II molecules were pulsed with a peptide derived from the λ2³¹⁵ immunoglobulin light chain. Onto such antigen-pulsed fibroblasts were sedimented cloned Th1 cells loaded with Fura-2. Changes in cytosolic Ca²⁺ concentration in single T cells were continually monitored by use of an imaging system based on fluorometry. Ca²⁺ mobilization was both peptide-specific and MHC-restricted. Within seconds of the initial APC-T cell contact, a Ca²⁺ spike could be observed. The Ca²⁺ response gradually declined over a 25-min period, during which oscillations were noted. Various parameters characterizing the magnitude of the Ca²⁺ response (latency, increase rate, max and mean Ca²⁺ increase, frequency and period of oscillations) all correlated with the amount of peptide used for pulsing the fibroblasts. Thus, Ca²⁺ mobilization in single T cells appears not to be an all or none phenomenon. Rather, activation is incremental (analog signaling), the degree of Ca²⁺ mobilization probably being related to the number of stimulatory peptide-MHC complexes on the surface of the APC. The extent of calcium mobilization and lymphokine production (interleukin (IL)-2, IL-3, interferon-γ) correlated, at least at the population level.     

两种MRI序列对听神经瘤成象的比较与评价

为选择中等场强的ＭＲＩ听神经瘤成像最佳序列。收集手术和病理证实的听神经瘤１３５例，分析序列Ⅰ、Ⅱ对内听道中心层面、三叉神经显示率及ＭＲ征象的显示情况。结果：序列Ｉ择内听道中心层面及三叉神经的显示均优于序列Ⅱ，序列Ⅱ在显示肿瘤内囊变、出血、不肿优于序列Ｉ；对肿瘤钙化、肿瘤血管、脑干移位的观察，两者相仿。结果显示：序列Ｉ在中等场经下作为听神经瘤成像的首选序列，并中运用到小脑角区ＭＲＩ成像。     

Left-sided superior vena cava: diagnosis by magnetic resonance imaging

We describe a case of left-sided superior vena cava. The diagnosis was suggested by chest radiograph after central venous catheter placement. This was subsequently confirmed by magnetic resonance imaging. Received: 4 March 1997 Accepted: 21 March 1997     

筛检对肝癌死亡率影响的研究

5581名HBsAg阳性的男性随机分入周期性筛检组(A组,3712人)及对照组(B组,1869人)。A组(19155.4人年)共发生肝癌257例,B组(9785.5人年)为117例,两组的肝癌发生率分别为1342/10万与1196/10万;两组肝癌死亡分别为218与109例,肝癌死亡率分别为1138/10万与1114/10万。两组中Ⅰ期肝癌病例分别为29.6％与6.0％,差异有非常显著性意义。1、3、5年相对生存率A组为23.7％、7.0％、4.0％,B组为9.7％、4.0％、4.1％。用Poisson回归模型拟合显示,在调正年龄、初筛AFP及入列年份后,筛检对于肝癌的相对危险度为0.83,95％CI为0.68～1.03,有较弱的“保护”作用,Cox回归模型拟合结果显示当临床分期未引入模型时,筛检对于肝癌有显著的“保护”作用:危险率为0.6617,95％CI为0.5234～0.8365;而模型经调整后,危险率即接近“1”,95％CI为0.74～1.26。     

The epidemiology and surveillance of blood lead in Taiwan (R.O.C.): A report on the PRESS-BLL project

 To monitor the lead hazards in industries and to investigate the prevalence of elevated blood lead levels (BLLs) in lead-exposed workers, a lead surveillance system (PRESS-BLLs) has been established and operated in Taiwan, Republic of China, since July 1993. A cohort of lead-exposed workers who received a periodic annual health examination at 55 accredited hospital laboratories was constructed. A total of 9807 separate BLL measurements were reported to the system in 1994. The mean BLL was 15.8 μg/dl in male workers and 11.6 μg/dl in female workers. The mean BLL of lead-exposed workers was significantly (P<0.05, z-test) higher than that of the general Taiwanese population (8.6 μg/dl for males and 6.7 μg/dl for females). In addition, the BLLs of 983 (10.0%) workers exceeded the regulatory action level (40 μg/dl for males; 30 μg/dl for females). The workplaces and homes of 57% of the workers with elevated BLLs were thoroughly investigated to determine the sources of lead contamination. These actions identified the causes of elevated BLLs and set up strategies to reduce workers’ lead exposure. The establishment of this occupational lead surveillance system represents a method for monitoring of lead hazards from occupational and environmental settings to prevent lead poisoning. The information acquired from the system can help in the setting up of a priority of prevention and the development of control measures. It is also useful for further monitoring of changes in the BLLs of the lead-exposed-worker cohort. The Health Department of Taiwan can use this information to evaluate the effectiveness of current industrial hygiene practice. Subjects with elevated BLLs have been medically treated and placed on long-term follow-up for sequelae. Received: 2 September 1996/Accepted: 29 November 1996     

低能量血管内激光照射治疗脑损伤的免疫功能变化与研究

本文对49例接受低能全血管内激光照射治（ILIB）的脑损伤病人的免疫功能改变进行研究．研究显示，低能量血管内激光照射疗法可明显改善免疫状态和免疫反应水平，增强免疫功能和机体抗感染能力．