The present study was undertaken in moist temperate forest of Mandal-Chopta area in the Garhwal region of Uttarakhand, India. The aim of the present study was to understand the regeneration dynamics of the dominant tr...The present study was undertaken in moist temperate forest of Mandal-Chopta area in the Garhwal region of Uttarakhand, India. The aim of the present study was to understand the regeneration dynamics of the dominant tree species along an altitudinal gradient in naturally regen- erating, restricted access forest. The overall regeneration status was fairly high in the study area. Most of the native canopy and undercanopy domi- nants had frequent reproduction and expanding populations, which sug- gests the stability of forest structure/composition and further expansion of dominant species. The overall regeneration of trees in the forest had a greater contribution of middle and understurey species. Because of infre- quent rep＇roduction and declining populations of some of the dominant native species viz., Abies pindrow, Alnus nepalensis and Betula alnoides, structural/compositional changes in the future are expected in respective forests dominated by them..4bies pindrow and Taxus baccata need im- mediate attention by forest managers for their survival in the area. Seed- lings were found to be more prone to competition from herb and shrubs than saplings.展开更多
Bioactive glasses （BGs） are ideal materials for macroporous scaffolds due to their excellent osteoconductive, osteoinductive, biocompatible and biodegradable properties, and their high bone bonding rates. Macroporou...Bioactive glasses （BGs） are ideal materials for macroporous scaffolds due to their excellent osteoconductive, osteoinductive, biocompatible and biodegradable properties, and their high bone bonding rates. Macroporous scaffolds made From BGs are in high demand for bone regeneration because they can stimulate vascularized bone ingrowth and they enhance bonding between scaffolds and surrounding tissues. Engineering BG/biopolymers （BP） composites or hybrids may be a good way to prepare macroporous scaffolds with excellent properties. This paper summarizes the progress in the past few years in preparing three-dimensional macroporous BG and BG/BP scaffolds for bone regeneration. Since the brittleness of BGs is a major problem in developing macroporous scaffolds and this limits their use in load bearing applications, the mechanical properties of macroporous scaffolds are particularly emphasized in this review.展开更多
肝再生实际上是肝脏在组织发生缺损后进行损伤修复的代偿性增生过程,其机制非常复杂,多种细胞因子、核受体和信号通路参与其中.法尼醇X受体(farnesoid X receptor,FXR)是需配体激活的转录因子,属于代谢性核受体,在肝脏胆汁酸、脂质、糖...肝再生实际上是肝脏在组织发生缺损后进行损伤修复的代偿性增生过程,其机制非常复杂,多种细胞因子、核受体和信号通路参与其中.法尼醇X受体(farnesoid X receptor,FXR)是需配体激活的转录因子,属于代谢性核受体,在肝脏胆汁酸、脂质、糖代谢过程中起着重要的调节作用.近来研究发现,核受体FXR对肝脏再生至关重要.FXR的激活通过促进部分肝切除后肝细胞的增殖,直接促进肝脏再生;通过调节胆汁酸的合成与转运,避免切除后胆汁酸过多引起的肝组织损伤;其代谢调节作用有益于肝再生进程.本文着重对FXR调控肝再生的机制及促肝再生药物靶向治疗做一综述.展开更多
基金supported by the Department of Science and Technology, Government of India, New Delhi, vide its Project No. SP/SO/PS-52/2004
文摘The present study was undertaken in moist temperate forest of Mandal-Chopta area in the Garhwal region of Uttarakhand, India. The aim of the present study was to understand the regeneration dynamics of the dominant tree species along an altitudinal gradient in naturally regen- erating, restricted access forest. The overall regeneration status was fairly high in the study area. Most of the native canopy and undercanopy domi- nants had frequent reproduction and expanding populations, which sug- gests the stability of forest structure/composition and further expansion of dominant species. The overall regeneration of trees in the forest had a greater contribution of middle and understurey species. Because of infre- quent rep＇roduction and declining populations of some of the dominant native species viz., Abies pindrow, Alnus nepalensis and Betula alnoides, structural/compositional changes in the future are expected in respective forests dominated by them..4bies pindrow and Taxus baccata need im- mediate attention by forest managers for their survival in the area. Seed- lings were found to be more prone to competition from herb and shrubs than saplings.
文摘Bioactive glasses （BGs） are ideal materials for macroporous scaffolds due to their excellent osteoconductive, osteoinductive, biocompatible and biodegradable properties, and their high bone bonding rates. Macroporous scaffolds made From BGs are in high demand for bone regeneration because they can stimulate vascularized bone ingrowth and they enhance bonding between scaffolds and surrounding tissues. Engineering BG/biopolymers （BP） composites or hybrids may be a good way to prepare macroporous scaffolds with excellent properties. This paper summarizes the progress in the past few years in preparing three-dimensional macroporous BG and BG/BP scaffolds for bone regeneration. Since the brittleness of BGs is a major problem in developing macroporous scaffolds and this limits their use in load bearing applications, the mechanical properties of macroporous scaffolds are particularly emphasized in this review.
文摘肝再生实际上是肝脏在组织发生缺损后进行损伤修复的代偿性增生过程,其机制非常复杂,多种细胞因子、核受体和信号通路参与其中.法尼醇X受体(farnesoid X receptor,FXR)是需配体激活的转录因子,属于代谢性核受体,在肝脏胆汁酸、脂质、糖代谢过程中起着重要的调节作用.近来研究发现,核受体FXR对肝脏再生至关重要.FXR的激活通过促进部分肝切除后肝细胞的增殖,直接促进肝脏再生;通过调节胆汁酸的合成与转运,避免切除后胆汁酸过多引起的肝组织损伤;其代谢调节作用有益于肝再生进程.本文着重对FXR调控肝再生的机制及促肝再生药物靶向治疗做一综述.
