A series of alloyed Zn‐Cd‐S solid solutions with a cubic zinc blende structure were fabricated hydrothermally with the assistance of L‐cystine under mild conditions.The products were characterized by XRD,TEM,HRTEM,...A series of alloyed Zn‐Cd‐S solid solutions with a cubic zinc blende structure were fabricated hydrothermally with the assistance of L‐cystine under mild conditions.The products were characterized by XRD,TEM,HRTEM,XPS,UV‐vis,and BET techniques,and the photocatalytic performance for the reduction of water to H2on the solid solutions was evaluated in the presence of S2?/SO32?as hole scavengers under visible light illumination.Among all the samples,the highest photocatalytic activity was achieved over Zn0.9Cd0.1S with a rate of4.4mmol h?1g?1,even without a co‐catalyst,which far exceeded that of CdS.Moreover,Zn0.9Cd0.1S displayed excellent anti‐photocorrosion properties during the photoreduction of water into H2.The enhancement in the photocatalytic performance was mainly attributed to the efficient charge transfer in the Zn0.9Cd0.1alloyed structure and the high surface area.This work provides a simple,cost‐effective and green technique,which can be generalized as a rational preparation route for the large‐scale fabrication of metal sulfide photocatalysts.展开更多
Transforming growth factor-β （TGF-β） binds with two transmembrane serine/threonine kinase receptors, type Ⅱ （TβRII） and type Ⅰ receptors （TβRⅠ）, and one accessory receptor, type Ⅲ receptor （TβRⅢ）, to...Transforming growth factor-β （TGF-β） binds with two transmembrane serine/threonine kinase receptors, type Ⅱ （TβRII） and type Ⅰ receptors （TβRⅠ）, and one accessory receptor, type Ⅲ receptor （TβRⅢ）, to transduce signals across cell membranes. Previous biochemical studies suggested that TβRI and TβRIII are preexisted homo-dimers. Using single-molecule microscopy to image green fluorescent protein-labeled membrane proteins, for the first time we have demonstrated that TβRI and TβRⅢ could exist as monomers at a low expression level. Upon TGF-β1 stimu- lation, TβRI follows the general ligand-induced receptor dimerization model for activation, but this process is TβRⅡ- dependent. The monomeric status of the non-kinase receptor TβRⅢ is unchanged in the presence of TGF-β1. With the increase of receptor expression, both TβRI and TβRIII can be assembled into dimers on cell surfaces.展开更多
基金supported by the National Natural Science Foundation of China (21573100, 21573099) the Open Project of State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences (N-14-04)~~
文摘A series of alloyed Zn‐Cd‐S solid solutions with a cubic zinc blende structure were fabricated hydrothermally with the assistance of L‐cystine under mild conditions.The products were characterized by XRD,TEM,HRTEM,XPS,UV‐vis,and BET techniques,and the photocatalytic performance for the reduction of water to H2on the solid solutions was evaluated in the presence of S2?/SO32?as hole scavengers under visible light illumination.Among all the samples,the highest photocatalytic activity was achieved over Zn0.9Cd0.1S with a rate of4.4mmol h?1g?1,even without a co‐catalyst,which far exceeded that of CdS.Moreover,Zn0.9Cd0.1S displayed excellent anti‐photocorrosion properties during the photoreduction of water into H2.The enhancement in the photocatalytic performance was mainly attributed to the efficient charge transfer in the Zn0.9Cd0.1alloyed structure and the high surface area.This work provides a simple,cost‐effective and green technique,which can be generalized as a rational preparation route for the large‐scale fabrication of metal sulfide photocatalysts.
基金This work was supported by the National Natural Science Foundation of China （90713024, 20821003, 30921004）, the National Basic Research Program of China （2007CB935601, 2010CB833706） and the Chinese Academy of Sciences.
文摘Transforming growth factor-β （TGF-β） binds with two transmembrane serine/threonine kinase receptors, type Ⅱ （TβRII） and type Ⅰ receptors （TβRⅠ）, and one accessory receptor, type Ⅲ receptor （TβRⅢ）, to transduce signals across cell membranes. Previous biochemical studies suggested that TβRI and TβRIII are preexisted homo-dimers. Using single-molecule microscopy to image green fluorescent protein-labeled membrane proteins, for the first time we have demonstrated that TβRI and TβRⅢ could exist as monomers at a low expression level. Upon TGF-β1 stimu- lation, TβRI follows the general ligand-induced receptor dimerization model for activation, but this process is TβRⅡ- dependent. The monomeric status of the non-kinase receptor TβRⅢ is unchanged in the presence of TGF-β1. With the increase of receptor expression, both TβRI and TβRIII can be assembled into dimers on cell surfaces.
