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文献和实验The Guinea Pig Model of Legionnaires Disease
The guinea pig pneumonia model mimics Legionnaires’ disease as seen in immunocompromised humans, with high untreated fatality rates and as such lends itself to studies of experimental chemotherapy. Guinea pig infection is also used to assess
Neuronal Networks in the In Vitro Isolated Guinea Pig Brain
Neuronal networks can be properly analyzed in experimental preparations that preserve the largest �connectivity within and between brain structures. The isolated whole guinea pig brain maintained in vitro by arterial perfusion
甲状旁腺激素(parathyroid hormone,PTH)
甲状旁腺主细胞分泌的肽类激素。正常人血浆PTH含量约1毫微克/毫升,最高可达6毫微克/毫升。其主要靶器官是骨、肾和小肠,调节钙、磷代谢,最终效应是升血钙,降低血磷:(1)对骨的作用。PTH刺激骨质吸收,动员骨的钙、磷入血。可分为快速效应和慢速效应两个时相。快速效应数分钟内即可发生,作用于骨细胞膜系统。骨细胞膜系统是由骨细胞和成骨细胞组成的一层膜,除破骨细胞邻近的区域外,覆盖全部骨表面和腔隙表面,从而在骨质与细胞外液之间形成可通透性屏障。这层膜与骨质之间有少量滑液,细胞外液侧
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