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充质式温度计
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作者 朱民 《国外计量》 1990年第5期 17-18,共2页
<正> 1.前言尽管玻璃液体温度计易于破碎,它仍是一种简单,应用广泛的温度计。介质有水银和有机物液体两种,类型有:(1)全浸式:正确读数时,感温包和液柱应处在被测温场中。(2)局浸式:读数时,感温包和液柱特定部分应浸入液体中。
关键词 温度计 充质式 温度测量
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Intravenous injection of mesenchymal stem cells is effective in treating liver fibrosis 被引量:32
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作者 Wei Zhao Jun-Jie Li +6 位作者 Da-Yong Cao Xiao Li Lin-Ying Zhang Yong He Shu-Qiang Yue De-Sheng Wang Ke-Feng Dou 《World Journal of Gastroenterology》 SCIE CAS CSCD 2012年第10期1048-1058,共11页
AIM: To compare the influence of different transplant sites in bone marrow mesenchymal stem cell (MSC)-based therapy for liver fibrosis. METHODS: MSCs isolated from Sprague Dawley (SD) rats were induced into hepatocyt... AIM: To compare the influence of different transplant sites in bone marrow mesenchymal stem cell (MSC)-based therapy for liver fibrosis. METHODS: MSCs isolated from Sprague Dawley (SD) rats were induced into hepatocyte-like cells. Liver fibrosis in SD rats was induced with carbon tetrachloride. Following hepatocyte induction in vitro, 4',6-diamidino- 2-phenylindole (DAPI)-labeled MSCs were transplanted by intravenous, intrahepatic, and intraperitoneal injection. Histopathological staining, immunohistochemistry, and biochemical analysis were used to compare the morphological and functional liver regeneration among different MSC injection modalities. The expression differences of interleukins, growth factor, extracellular matrix, matrix metalloproteinases, and tissue inhibitor of metalloproteinase were examined by real-time reverse transcription-polymerase chain reaction (RT-PCR) andenzyme linked immunosorbent assay (ELISA). RESULTS: Four days after exposure to hepatocyte differentiation medium, MSCs that did not express hepatocyte markers could express α-fetoprotein, albumin, and cytokeratin 18. The results of histopathological staining, immunohistochemistry, and biochemical analysis indicated that intravenous injection is more effective at rescuing liver failure than other injection modalities. DAPI-labeled cells were found around liver lobules in all three injection site groups, but the intravenous group had the highest number of cells. PCR and ELISA analysis indicated that interleukin-10 (IL-10) was highest in the intravenous group, whereas il1β, il6, tnfα and tgfβ, which can be regulated by IL10 and are promoters of liver fibrosis, were significantly lower than in the other groups. CONCLUSION: MSC administration is able to protect against liver fibrosis. Intravenous injection is the most favorable treatment modality through promotion of IL10 expression. 展开更多
关键词 Mesenchymal stem cells Hepatocyte differentiation Intravenous injection Liver fibrosis INTERLEUKIN-10
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Negative Valve Overlap Mode of HCCI Operation Using Gasoline and Diesel Blended Fuels
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作者 钟绍华 陈永东 +1 位作者 Miroslaw Lech Wyszynski 徐宏明 《Transactions of Tianjin University》 EI CAS 2007年第6期416-422,共7页
The negative valve overlap (NVO) strategy of HCCI operation was experimentally investigated on a gasoline HCCI engine operated with variable valve timing in association with the addition of diesel fuel. The experiment... The negative valve overlap (NVO) strategy of HCCI operation was experimentally investigated on a gasoline HCCI engine operated with variable valve timing in association with the addition of diesel fuel. The experimental results show that, by using gasoline and diesel blended fuels, the required NVO interval for suitable HCCI combustion under a given engine speed and a moderate compression ratio condition could be reduced, and the HCCI combustion region was extended remarkably without substantial increase in NOx emissions under a given inlet and exhaust valve timing due to the improvement of charge ignitability. In addition, the possible scale of NVO was extended. A substantial increase in the lean limit of excess air ratio and the upper limit of load range can be achieved because of higher volumetric efficiency, resulting from the decrease in the required NVO and the presence of less residual gases in cylinder. 展开更多
关键词 homogeneous charge compression ignition (HCCI) negative valve overlap(NVO) COMBUSTION blended fuels
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