负载型丝光沸石催化剂的催化性能研究

运用二元碱氮置换吸附红外光谱法、分子筛孔径分布测定技术、XPS技术,考察了丝光沸石表面酸性与孔结构的相互关系、钯在丝光沸石上分布情况和价态及其与沸石的相互作用。结果表明,随着丝光沸石脱铝程度的增加,表面出现大量不规整晶格,存在较多的次级孔道。强质子酸中心主要分布在它的“外表面”。钯在其表面富集,并与“外表面”上的质子酸中心协同作用,促进了轻质烷烃异构化反应。     

前列腺癌组织中细胞外基质的免疫组织化学研究

为探讨前列腺癌（ＰＣａ）细胞的转移机制，应用免疫组织化学ＡＢＣ法在良性前列腺增生（ＢＰＨ）及ＰＣａ组织中对基膜连接蛋白（ＬＮ），胶原Ⅳ型蛋白（ＣＯＬⅣ），纤维连接蛋白（ＦＮ）等细胞外基质（ＥＣＭ）蛋白的表达进行检测，结果ＢＰＨ组织中基底膜部位ＬＮ，ＣＯＬⅣ及ＦＮ的染色呈连续线状分布，ＰＣａ组组织基底膜部位ＬＮ，ＣＯＬⅣ及ＦＮ的阳性染色呈碎片状或断线状分布。ＣＯＬⅣ在ＢＰＨ与ＰＣａ组织中的强阳性率无显著性差异（Ｐ＞０．０５）。结果提示ＥＣＭ在ＰＣａ组织中基底膜部位的明显缺失（非连续线状分布）可能是肿瘤转移的重要因素。     

血管内氧合器的研制

为了探索呼吸辅助的新方法，我们采用国产聚丙烯中空纤维，自行设计、制造模具，研制出一种血管内氧合器。该氧合器是一个小的、细长的可经单侧股静脉或颈静脉切开，置入腔静脉内的装置。氧合器有效长度４０ｃｍ，膜交换面积０．０９ｍ＾２。经负压调节通过血管内氧合器的氧流量，以防止纤维破裂造成的血管内气栓的危险。一根双腔导气管使气体经同一静脉切开部位循环，气体经内芯管流经血管内氧合器尖端，然后经中空纤维束流出。目前     

Active oxygen radicals produced by leukocytes of malignant lymphoma.

The electron spin resonance (ESR) spectra of active oxygen radicals produced during the respiratory burst of PMA-stimulated leukocytes and oxygen consumption are studied by ESR spin trapping and spin probe oxymetry for 31 times in 17 cases of malignant lymphoma. The results showed that the spectra produced from PMA-stimulated patients' leukocytes were predominantly spin adducts of DMPO-hydroxyl radicals (DMPO-OH). The decrease in oxygen consumption during respiratory burst suggested that respiratory burst function was inhibited. Kinetic observations of patient condition showed that respiratory burst and oxygen consumption were improved and even approached normal, when the patient was in remission or the condition was ameliorated. This paper is the first of its type and helps clarify the mechanism of malignant proliferation and metastasis.

     

Effects of Phentolamine on Hemorrheology and Hemodynamics in Dogs with Acute Liver Damage

ＥｆｆｅｃｔｓｏｆＰｈｅｎｔｏｌａｍｉｎｅｏｎＨｅｍｏｒｒｈｅｏｌｏｇｙａｎｄＨｅｍｏｄｙｎａｍｉｃｓｉｎＤｏｇｓｗｉｔｈＡｃｕｔｅＬｉｖｅｒＤａｍａｇｅＤＡＮＺｉｌｉ（但自力）；ＺＨＡＮＧＷｅｎｙｉｎｇ（张文英）；ＬＩＳｈａｏｂａｉ（李绍白）（Ｉｎ...     

日本血吸虫感染小鼠脾细胞IL—2及IFN—γ动态观察

本文观察８ｗｋ龄Ｃ５７ＢＬ／６小鼠感染日本血吸虫尾蚴后不同时期脾细胞经ＳＥＡ或ＣｏｎＡ刺激，体外诱生的ＩＬ－２和ＩＦＮ－γ活性变化。结果表明两种细胞因子活性均在感染后第４－６ｗｋ开始上升，第６—８ｗｋ达高峰，第１２—１４ｗｋ恢复至感染前水平。ＩＦＮ－γ高峰时间略先于ＩＬ－２。非特异性刺激原诱生组和特异性刺激原诱生组各阶段细胞因子活性动态基本一致，前组活性高于后组。提示ＩＦＮ－γ与ＩＬ－２活性与血吸虫卵肉芽肿的诱导、成熟与维持有密切关系。     

Alcohol effects on the percentage of beta waves in the electroencephalograms of twins

Electroencephalogram (EEG) recordings were made from 26 pairs of monozygotic (MZ) and 26 pairs of dizygotic (DZ) adult male twins, before and after alcohol ingestion. After a baseline EEG and a light breakfast, 1.2 ml/kg of ethanol was given orally over 15 min and the EEG repeated four times at hourly intervals. Alcohol caused a significant drop in the percentage of beta waves (14-30 cycles/sec) during the 1st hr. For the percentage of beta waves in 38 pairs of twins with complete data, MZ twin beta-wave intraclass correlations (RMZ) ranged between 0.85 and 0.91 before and after alcohol, but the DZ intraclass correlations (RDZ) started at 0.54 and fell to 0.05 at 2 hr after alcohol before recovering to baseline levels. These correlations resulted in heritability estimates [2(RMZ-RDZ)] of 0.68 at baseline and 1.73 at 2 hr. A heritability of 1.43 was found for the 1st hr drop in percentage of beta waves (RMZ = 0.78, RDZ = 0.06). These unrealistically high heritabilities, due to RDZ's approaching 0.0, suggest a failure of assumptions in the linear twin model that was used. Also, these findings are similar to, but more exaggerated than, findings in resting EEG's and visually evoked EEG potentials of twins and are compatible with the influence of gene interactions.     

胃粘膜上皮“适应性细胞保护”机制防止胃肿瘤发生的作用

投用致癌剂的对照组其胃肿瘤发生率为22.2％。若同时给予40％Z醇液空腹灌胃,则胃肿瘤发生率达55.9％。如在给乙醇液前15分钟,先给予4％的辣椒煎液灌胃,则胃肿瘤发生率只有20.0％,相近于对照组的水平(后2组差别有极显著意义,P<0.01)。这种给损伤剂(乙醇)之前先给予微刺激剂(辣椒)所产生的胃粘膜的保护作用,是通过促使胃粘膜上皮细胞合成内源性前列腺素(PGs)来实现的,是一种“适应性细胞保护”机制。这种保护胃粘膜的作用可降低胃肿瘤的发生率。     

移动式护理机器人的控制系统

介绍自行研制的移动式护理机器人控制系统的功能和结构、开发过程中所面临的主要问题以及安全保护措施。所研制的机器人的控制系统具有高水平命令编译、机器人运动规划及环境设备控制功能。用户发出的任务指令由机器人的高水平集成控制系统分解为一系列低层的机器人部件控制命令或电器设备操作指令，然后由相应的控制器予以执行。