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液压转向系统(8)
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作者 于增扬 《农业机械》 2000年第1期48-49,共2页
九、液压助力转向机构液压助力转向机构简称液压助力器,又称转向加力器。它的功用与转向要求和全液压转向器完全一样,使驾驶员仅用较小的力,就能灵活轻便地让重型车辆实现转向。在大多数车辆上是用油缸来推动导向轮,并遵循以下规律,即... 九、液压助力转向机构液压助力转向机构简称液压助力器,又称转向加力器。它的功用与转向要求和全液压转向器完全一样,使驾驶员仅用较小的力,就能灵活轻便地让重型车辆实现转向。在大多数车辆上是用油缸来推动导向轮,并遵循以下规律,即导向轮偏转角大小与转向盘转动圈数成正比,导向轮偏转快慢与转向盘转动速度成正比。 展开更多
关键词 液压转向系统 液压助力器 车辆 有路感
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Signal transduction pathways in liver and the influence of hepatitis C virus infection on their activities 被引量:3
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作者 Magdalena M Dabrowska Anatol Panasiuk Robert Flisiak 《World Journal of Gastroenterology》 SCIE CAS CSCD 2009年第18期2184-2189,共6页
In liver,the most intensively studied transmembrane and intracellular signal transduction pathways are the Janus kinase signal transduction pathway,the mitogen-activated protein kinases signal transduction pathway,the... In liver,the most intensively studied transmembrane and intracellular signal transduction pathways are the Janus kinase signal transduction pathway,the mitogen-activated protein kinases signal transduction pathway,the transforming growth factor β signal transduction pathway,the tumor necrosis factor α signal transduction pathway and the recently discovered sphingolipid signal transduction pathway.All of them are activated by many different cytokines and growth factors.They regulate specific cell mechanisms such as hepatocytes proliferation,growth,differentiation,adhesion,apoptosis,and synthesis and degradation of the extracellular matrix.The replication cycle of hepatitis C virus(HCV) is intracellular and requires signal transduction to the nucleus to regulate transcription of its genes.Moreover,HCV itself,by its structural and non-structural proteins,could influence the activity of the second signal messengers.Thus,the inhibition of the transmembrane and intracellular signal transduction pathways could be a new therapeutic target in chronic hepatitis C treatment. 展开更多
关键词 LIVER Hepatitis C virus infection Signaltransduction pathway PROLIFERATION APOPTOSIS
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