Nel样分子I型(Nel-like type I molecular,NELL-1)是一种与人颅缝早闭症相关的外分泌型蛋白,近年来一系列体外及体内研究表明NELL-1更是一种非常有效的骨生长因子。与其他骨生长因子相比,NELL-1的生物学效应相对单一,其骨诱导活性也更...Nel样分子I型(Nel-like type I molecular,NELL-1)是一种与人颅缝早闭症相关的外分泌型蛋白,近年来一系列体外及体内研究表明NELL-1更是一种非常有效的骨生长因子。与其他骨生长因子相比,NELL-1的生物学效应相对单一,其骨诱导活性也更具有特异性,同时它无法单独诱导异位骨组织形成,因此NELL-1可具有更高的生物安全性和精准性。NELL-1作为一种全新的生长因子在治疗各类骨组织缺损与骨再生方面具有广阔而良好的应用前景。本文就目前NELL-1在骨再生领域的应用及其作用机制研究的进展做一综述。展开更多
Sand/dust storms are some of the main hazards in arid and semi-arid zones. These storms also influence global environmental changes. By field observations, empirical statistics, and numerical simulations, pioneer rese...Sand/dust storms are some of the main hazards in arid and semi-arid zones. These storms also influence global environmental changes. By field observations, empirical statistics, and numerical simulations, pioneer researchers on these natural events have concluded the existence of a positive relationship between thermodynamic effects and sand/dust storms. Thermodynamic effects induce an unsteady stratified atmosphere to influence the process of these storms. However, studies on the relationship of thermodynamic effects with particles (i.e., sand and dust) are limited. In this article, wind tunnel with heating was used to simulate the quantitative relationship between thermodynamic effects and particle movement on different surfaces. Compared with the cold state, the threshold wind velocity of particles is found to be significantly decrease under the hot state. The largest decrease percentage exceedes 9% on fine and coarse sand surfaces. The wind velocity also has a three-power function in the sand transport rate under the hot state with increased sand transport. Thermodynamic effects are stronger on loose surfaces and fine particles, but weaker on compacted surfaces and coarse particles.展开更多
文摘Nel样分子I型(Nel-like type I molecular,NELL-1)是一种与人颅缝早闭症相关的外分泌型蛋白,近年来一系列体外及体内研究表明NELL-1更是一种非常有效的骨生长因子。与其他骨生长因子相比,NELL-1的生物学效应相对单一,其骨诱导活性也更具有特异性,同时它无法单独诱导异位骨组织形成,因此NELL-1可具有更高的生物安全性和精准性。NELL-1作为一种全新的生长因子在治疗各类骨组织缺损与骨再生方面具有广阔而良好的应用前景。本文就目前NELL-1在骨再生领域的应用及其作用机制研究的进展做一综述。
基金Under the auspices of National Natural Science Foundation of China(No.40930741,41071009,41001005)Knowledge Innovation Programs of Chinese Academy of Sciences(No.KZCX2-YW-329)
文摘Sand/dust storms are some of the main hazards in arid and semi-arid zones. These storms also influence global environmental changes. By field observations, empirical statistics, and numerical simulations, pioneer researchers on these natural events have concluded the existence of a positive relationship between thermodynamic effects and sand/dust storms. Thermodynamic effects induce an unsteady stratified atmosphere to influence the process of these storms. However, studies on the relationship of thermodynamic effects with particles (i.e., sand and dust) are limited. In this article, wind tunnel with heating was used to simulate the quantitative relationship between thermodynamic effects and particle movement on different surfaces. Compared with the cold state, the threshold wind velocity of particles is found to be significantly decrease under the hot state. The largest decrease percentage exceedes 9% on fine and coarse sand surfaces. The wind velocity also has a three-power function in the sand transport rate under the hot state with increased sand transport. Thermodynamic effects are stronger on loose surfaces and fine particles, but weaker on compacted surfaces and coarse particles.
