The objective of this work is to investigate the dynamics of a self-propelled undulating sheet in a non-Newtonian electrolyte solution inside a wavy channel under the electroosmotic effect.The electrolyte solution,whi...The objective of this work is to investigate the dynamics of a self-propelled undulating sheet in a non-Newtonian electrolyte solution inside a wavy channel under the electroosmotic effect.The electrolyte solution,which is non-Newtonian,is modeled as a Carreau-Yasuda fluid.The flow generated by a combination of an undulating sheet and electroosmotic effect is obtained by solving the continuity and momentum equations.The electroosmotic body force term is derived using the Poisson-Boltzmann equation for the electric potential.A fourth-order ordinary differential equation for the stream function is solved under the Stokes flow regime.The dynamics of the undulating sheet’s speed and the energy dissipation it,are investigated.The combined effects of electroosmosis and the viscoelastic properties of the ambient fluid on the undulating sheet are discussed.展开更多
Cold seeps in the deep sea are closely linked to energy exploration as well as global climate change.The alkane-dominated chemical energy-driven model makes cold seeps an oasis of deep-sea life,showcasing an unparalle...Cold seeps in the deep sea are closely linked to energy exploration as well as global climate change.The alkane-dominated chemical energy-driven model makes cold seeps an oasis of deep-sea life,showcasing an unparalleled reservoir of microbial genetic diversity.Here,by analyzing 113 metagenomes collected from 14 global sites across 5 cold seep types,we present a comprehensive Cold Seep Microbiomic Database(CSMD)to archive the genomic and functional diversity of cold seep microbiomes.The CSMD includes over 49 million non-redundant genes and 3175 metagenome-assembled genomes,which represent 1895 species spanning 105 phyla.In addition,beta diversity analysis indicates that both the sampling site and cold seep type have a substantial impact on the prokaryotic microbiome community composition.Heterotrophic and anaerobic metabolisms are prevalent in microbial communities,accompanied by considerable mixotrophs and facultative anaerobes,highlighting the versatile metabolic potential in cold seeps.Furthermore,secondary metabolic gene cluster analysis indicates that at least 98.81%of the sequences potentially encode novel natural products,with ribosomally synthesized and post-translationally modified peptides being the predominant type widely distributed in archaea and bacteria.Overall,the CSMD represents a valuable resource that would enhance the understanding and utilization of global cold seep microbiomes.展开更多
文摘The objective of this work is to investigate the dynamics of a self-propelled undulating sheet in a non-Newtonian electrolyte solution inside a wavy channel under the electroosmotic effect.The electrolyte solution,which is non-Newtonian,is modeled as a Carreau-Yasuda fluid.The flow generated by a combination of an undulating sheet and electroosmotic effect is obtained by solving the continuity and momentum equations.The electroosmotic body force term is derived using the Poisson-Boltzmann equation for the electric potential.A fourth-order ordinary differential equation for the stream function is solved under the Stokes flow regime.The dynamics of the undulating sheet’s speed and the energy dissipation it,are investigated.The combined effects of electroosmosis and the viscoelastic properties of the ambient fluid on the undulating sheet are discussed.
基金support from the Senior User Project of RV KEXUE(Grant No.KEXUE2019GZ05)the Center for Ocean Mega-Science,Chinese Academy of Sciences+2 种基金funding support from the Second Tibetan Plateau Scientific Expedition and Research Program(Grant No.2021QZKK0100)the National Key R&D Program of China(Grant No.2022YFF1002801)the National Natural Science Foundation of China(Grant No.92251302).
文摘Cold seeps in the deep sea are closely linked to energy exploration as well as global climate change.The alkane-dominated chemical energy-driven model makes cold seeps an oasis of deep-sea life,showcasing an unparalleled reservoir of microbial genetic diversity.Here,by analyzing 113 metagenomes collected from 14 global sites across 5 cold seep types,we present a comprehensive Cold Seep Microbiomic Database(CSMD)to archive the genomic and functional diversity of cold seep microbiomes.The CSMD includes over 49 million non-redundant genes and 3175 metagenome-assembled genomes,which represent 1895 species spanning 105 phyla.In addition,beta diversity analysis indicates that both the sampling site and cold seep type have a substantial impact on the prokaryotic microbiome community composition.Heterotrophic and anaerobic metabolisms are prevalent in microbial communities,accompanied by considerable mixotrophs and facultative anaerobes,highlighting the versatile metabolic potential in cold seeps.Furthermore,secondary metabolic gene cluster analysis indicates that at least 98.81%of the sequences potentially encode novel natural products,with ribosomally synthesized and post-translationally modified peptides being the predominant type widely distributed in archaea and bacteria.Overall,the CSMD represents a valuable resource that would enhance the understanding and utilization of global cold seep microbiomes.
