Humic acid(HA),a principal constituent of natural organic matter(NOM),manifests ubiquitously across diverse ecosystems and can significantly influence the environmental behaviors of Cd(II)in aquatic systems.Previous s...Humic acid(HA),a principal constituent of natural organic matter(NOM),manifests ubiquitously across diverse ecosystems and can significantly influence the environmental behaviors of Cd(II)in aquatic systems.Previous studies on NOM-Cd(II)interactions have primarily focused on the immobilization of Cd(II)solids,but little is known about the colloidal stability of organically complexed Cd(II)particles in the environment.In this study,we investigated the formation of HA-Cd(II)colloids and quantified their aggregation,stability,and transport behaviors in a saturated porous media representative of typical subsurface conditions.Results from batch experiments indicated that the relative quantity of HA-Cd(II)colloids increased with increasing C/Cd molar ratio and that the carboxyl functional groups of HA dominated the stability of HA-Cd(II)colloids.The results of correlation analysis between particle size,critical aggregation concentration(CCC),and zeta potential indicated that both Derjaguin-Landau-Verwey-Overbeek(DLVO)and non-DLVO interactions contributed to the enhanced colloidal stability of HA-Cd(II)colloids.Column results further confirmed that the stable HA-Cd(II)colloid can transport fast in a saturated media composed of clean sand.Together,this study provides newknowledge of the colloidal behaviors of NOM-Cd(II)nanoparticles,which is important for better understanding the ultimate cycling of Cd(II)in aquatic systems.展开更多
An increased number of patients with skin wounds have been witnessed in the past decades.Among the various kinds of treatments for skin wounds,topical exogenous growth factors are indispensable and have been used in m...An increased number of patients with skin wounds have been witnessed in the past decades.Among the various kinds of treatments for skin wounds,topical exogenous growth factors are indispensable and have been used in many countries.However,whether they have reliable effects remains controversial,and their application for skin wound treatment needs to be further standardized and optimized in terms of socio-economic considerations.Thus,the Chinese Burn Association developed this guideline indicating efficacy,application details,adverse reactions and precautions of five clinically common topical growth factors using the Grading of Recommendations Assessment Development and Evaluation method to promote the rational application of topical exogenous growth factors in skin wounds and to benefit more patients.展开更多
基金supported by Guizhou Science Cooperation Platform Talents(No.GCC[2023]045)the National Natural Science Foundation of China(Nos.42267030 and 42177237)+2 种基金the Innovation and Entrepreneurship Talents of Guizhou Province(No.GZQ202208091)the Science and Technology Planning Project of Guizhou Province(Qian Ke He Zhi Cheng,2022-217)the Science and Technology Planning Project of Guizhou Province(Qian Ke He Cheng Guo,2023-006).
文摘Humic acid(HA),a principal constituent of natural organic matter(NOM),manifests ubiquitously across diverse ecosystems and can significantly influence the environmental behaviors of Cd(II)in aquatic systems.Previous studies on NOM-Cd(II)interactions have primarily focused on the immobilization of Cd(II)solids,but little is known about the colloidal stability of organically complexed Cd(II)particles in the environment.In this study,we investigated the formation of HA-Cd(II)colloids and quantified their aggregation,stability,and transport behaviors in a saturated porous media representative of typical subsurface conditions.Results from batch experiments indicated that the relative quantity of HA-Cd(II)colloids increased with increasing C/Cd molar ratio and that the carboxyl functional groups of HA dominated the stability of HA-Cd(II)colloids.The results of correlation analysis between particle size,critical aggregation concentration(CCC),and zeta potential indicated that both Derjaguin-Landau-Verwey-Overbeek(DLVO)and non-DLVO interactions contributed to the enhanced colloidal stability of HA-Cd(II)colloids.Column results further confirmed that the stable HA-Cd(II)colloid can transport fast in a saturated media composed of clean sand.Together,this study provides newknowledge of the colloidal behaviors of NOM-Cd(II)nanoparticles,which is important for better understanding the ultimate cycling of Cd(II)in aquatic systems.
文摘An increased number of patients with skin wounds have been witnessed in the past decades.Among the various kinds of treatments for skin wounds,topical exogenous growth factors are indispensable and have been used in many countries.However,whether they have reliable effects remains controversial,and their application for skin wound treatment needs to be further standardized and optimized in terms of socio-economic considerations.Thus,the Chinese Burn Association developed this guideline indicating efficacy,application details,adverse reactions and precautions of five clinically common topical growth factors using the Grading of Recommendations Assessment Development and Evaluation method to promote the rational application of topical exogenous growth factors in skin wounds and to benefit more patients.
