Gut microbiota is a community of microorganisms that reside in the gastrointestinaltract. An increasing number of studies has demonstrated that the gutliveraxis plays a critical role in liver homeostasis. Dysbiosis of...Gut microbiota is a community of microorganisms that reside in the gastrointestinaltract. An increasing number of studies has demonstrated that the gutliveraxis plays a critical role in liver homeostasis. Dysbiosis of gut microbiota cancause liver diseases, including nonalcoholic fatty liver disease and alcoholic liverdisease. Preclinical and clinical investigations have substantiated that themetabolites and other molecules derived from gut microbiota and diet interactionfunction as mediators to cause liver fibrosis, cirrhosis, and final cancer. This effecthas been demonstrated to be associated with dysregulation of intrahepaticimmunity and liver metabolism. Targeting these findings have led to thedevelopment of novel preventive and therapeutic strategies. Here, we review thecellular and molecular mechanisms underlying gut microbiota-mediated impacton liver disease. We also summarize the advancement of gut microbiota-basedtherapeutic strategies in the control of liver diseases.展开更多
The cracking behaviour of X-70 pipeline steel in near-neutral pH solutions was studied under different modes of cyclic loading. The crack propagation process of X-70 pipeline steel under low frequency cyclic loading c...The cracking behaviour of X-70 pipeline steel in near-neutral pH solutions was studied under different modes of cyclic loading. The crack propagation process of X-70 pipeline steel under low frequency cyclic loading condition was controlled mainly by stress corrosion cracking （SCC） mechanism. Under mixed-mode cyclic loading, both higher tensile stress and shear stress made cracks easier to propagate. Applied cathodic potentials and high content of carbon dioxide in solutions also promoted the propagation of cracks. The propagation directions of cracks were different under different cyclic loading conditions. Under mode I （pure tensile stress） cyclic loading condition, cracks were straight and perpendicular to the tensile stress axis, while under mixed-mode 1/111 （tensile/shear stress） cyclic loading,cracks were sinuous and did not propagate in the direction perpendicular to the main tensile stress axis. Under the mixed-mode cyclic loading, cracks were much easier to propagate, suggesting that shear stress intensified the role of tensile stress. In addition, shear stress promoted the interaction between cracks, resulting in easier coalescence of cracks.展开更多
基金NIH Grant,No.R01CA208396and VA Merit Award,No.I01 BX004065-1.
文摘Gut microbiota is a community of microorganisms that reside in the gastrointestinaltract. An increasing number of studies has demonstrated that the gutliveraxis plays a critical role in liver homeostasis. Dysbiosis of gut microbiota cancause liver diseases, including nonalcoholic fatty liver disease and alcoholic liverdisease. Preclinical and clinical investigations have substantiated that themetabolites and other molecules derived from gut microbiota and diet interactionfunction as mediators to cause liver fibrosis, cirrhosis, and final cancer. This effecthas been demonstrated to be associated with dysregulation of intrahepaticimmunity and liver metabolism. Targeting these findings have led to thedevelopment of novel preventive and therapeutic strategies. Here, we review thecellular and molecular mechanisms underlying gut microbiota-mediated impacton liver disease. We also summarize the advancement of gut microbiota-basedtherapeutic strategies in the control of liver diseases.
基金This work was supported by the Special Funds for the Major State Basic Research Projects in China(No.G19990650)also supported by the Science and Technology Comm is—sion of Shanghai Municipality(Projects Nos.025258036 and 02ZE14031
文摘The cracking behaviour of X-70 pipeline steel in near-neutral pH solutions was studied under different modes of cyclic loading. The crack propagation process of X-70 pipeline steel under low frequency cyclic loading condition was controlled mainly by stress corrosion cracking （SCC） mechanism. Under mixed-mode cyclic loading, both higher tensile stress and shear stress made cracks easier to propagate. Applied cathodic potentials and high content of carbon dioxide in solutions also promoted the propagation of cracks. The propagation directions of cracks were different under different cyclic loading conditions. Under mode I （pure tensile stress） cyclic loading condition, cracks were straight and perpendicular to the tensile stress axis, while under mixed-mode 1/111 （tensile/shear stress） cyclic loading,cracks were sinuous and did not propagate in the direction perpendicular to the main tensile stress axis. Under the mixed-mode cyclic loading, cracks were much easier to propagate, suggesting that shear stress intensified the role of tensile stress. In addition, shear stress promoted the interaction between cracks, resulting in easier coalescence of cracks.
