Organisms have variable genome sizes and contain different numbers of genes. This difference demon-strates that new gene origination is a fundamental process in evolutionary biology. Though the study of the originatio...Organisms have variable genome sizes and contain different numbers of genes. This difference demon-strates that new gene origination is a fundamental process in evolutionary biology. Though the study of the origination of new genes dated back more than half a century ago, it is not until the 1990s when the first young gene jingwei was found that empirical investigation of the molecular mechanisms of origination of new genes became possible. In the recent years, several young genes were identified and the studies on these genes have greatly enriched the knowledge of this field. Yet more details in a general picture of new genes origination are to be clarified. We have developed a systematic approach to searching for young genes at the genomic level, in the hope to summarize a general pattern of the origination and evolution of new genes, such as the rate of new gene appearance, im-pact of new genes on their host genomes, etc.展开更多
A numerical analysis of non-Newtonian fluid flow in non-planar artery withbifurcation was performed by using a finite element method to solve the three-dimensionalNavier-Stokes equations coupled with the non-Newtonian...A numerical analysis of non-Newtonian fluid flow in non-planar artery withbifurcation was performed by using a finite element method to solve the three-dimensionalNavier-Stokes equations coupled with the non-Newtonian constitutive models, including Carreau, Crossand Bingham models. The objective of this study is to investigate the effects of . thenon-Newtonian properties of blood as well as curvature and out-of-plane geometry in the non-planardaughter vessels on the velocity distribution and wall shear stress. The results of this studysupport the view that the non-planarity of blood vessels and the non-Newtonian properties of bloodare of important in hemodynamics and play a significant role in vascular biology andpathophysiology.展开更多
文摘Organisms have variable genome sizes and contain different numbers of genes. This difference demon-strates that new gene origination is a fundamental process in evolutionary biology. Though the study of the origination of new genes dated back more than half a century ago, it is not until the 1990s when the first young gene jingwei was found that empirical investigation of the molecular mechanisms of origination of new genes became possible. In the recent years, several young genes were identified and the studies on these genes have greatly enriched the knowledge of this field. Yet more details in a general picture of new genes origination are to be clarified. We have developed a systematic approach to searching for young genes at the genomic level, in the hope to summarize a general pattern of the origination and evolution of new genes, such as the rate of new gene appearance, im-pact of new genes on their host genomes, etc.
文摘A numerical analysis of non-Newtonian fluid flow in non-planar artery withbifurcation was performed by using a finite element method to solve the three-dimensionalNavier-Stokes equations coupled with the non-Newtonian constitutive models, including Carreau, Crossand Bingham models. The objective of this study is to investigate the effects of . thenon-Newtonian properties of blood as well as curvature and out-of-plane geometry in the non-planardaughter vessels on the velocity distribution and wall shear stress. The results of this studysupport the view that the non-planarity of blood vessels and the non-Newtonian properties of bloodare of important in hemodynamics and play a significant role in vascular biology andpathophysiology.
