Nutrient boron(B)is important for crop development.The absorption and transport of B ions are regulated by the B transport(BOR)gene family.Although some members of the BOR gene family have been heavily researched,to t...Nutrient boron(B)is important for crop development.The absorption and transport of B ions are regulated by the B transport(BOR)gene family.Although some members of the BOR gene family have been heavily researched,to the best of our knowledge,no comprehensive research on the structural,evolutionary and functional relationships among crops has been reported.In this study,comparative genomic research of the BOR gene family was performed in five crops,40 BOR genes were identified,and analyses of phylogenetics,structure,conserved motifs,and transmembrane topology were performed.These genes had highly similar physicochemical properties,structure and motif distribution.Specific elements in the C-terminus and functional differences were also found among the genes.In addition,microsynteny and evolutionary analysis suggested that large-scale replication events and purifying selection played essential roles during the OsBOR gene evolutionary process in rice.Moreover,expression pattern of OsBORs were also analyzed.Our research provides comprehensive and detailed information on BOR genes in five crops and establishes a foundation for further functional exploration of these genes in B metabolic pathways.展开更多
We investigate atomic and electronic structures of boron nanotubes （BNTs） by using the density functional theory （DFT）. The transport properties of BNTs with different diameters and chiralities are studied by the ...We investigate atomic and electronic structures of boron nanotubes （BNTs） by using the density functional theory （DFT）. The transport properties of BNTs with different diameters and chiralities are studied by the Keldysh nonequilibrium Green function （NEGF） method. It is found that the cohesive energies and conductances of BNTs decrease as their diameters decrease. It is more difficult to form （N, 0） tubes than （M, M） tubes when the diameters of the two kinds of tubes are comparable. However, the （N, 0） tubes have a higher conductance than the （M, M） tubes. When the BNTs are connected to gold electrodes, the coupling between the BNTs and the electrodes will affect the transport properties of tubes significantly.展开更多
The transport properties of hexagonal boron-nitride nanoribbons under the uniaxial strain are investigated by the Green＇s function method. We find that the transport properties of armchair boron-nitride nanoribbon st...The transport properties of hexagonal boron-nitride nanoribbons under the uniaxial strain are investigated by the Green＇s function method. We find that the transport properties of armchair boron-nitride nanoribbon strongly depend on the strain. In particular, the features of the conductance steps such as position and width are significantly changed by strain. As a strong tensile strain is exerted on the nanoribbon, the highest conductance step disappears and subsequently a dip emerges instead. The energy band structure and the local current density of armchair boron nitride nanoribbon under strain are calculated and analysed in detail to explain these characteristics. In addition, the effect of strain on the conductance of zigzag boron-nitride nanoribbon is weaker than that of armchair boron nitride nanoribbon.展开更多
Electronic transport properties of single-wall boron nanotube （BNT） with different chiralities, diameters, some of which are encapsulated with silicon, germanium, and boron nanowires are theoretically studied. The r...Electronic transport properties of single-wall boron nanotube （BNT） with different chiralities, diameters, some of which are encapsulated with silicon, germanium, and boron nanowires are theoretically studied. The results indicate that the zigzag （3,3） BNT has more electronic transmission channels than the armchair （5,0） BNT because of its unique structure distortion. Nanowires encapsulated in the BNT can enhance the conductance of the BNT to some extent by providing a significant electronic transmission channel to the BNT. The effect of the structure of nanowires and the diameter of BNTs on the transport properties has also been discussed. The results of this paper can enrich the knowledge of the electron transport of the BNT and provide theoretical guidance for subsequent experimental study.展开更多
基金National Science Foundation of Anhui Province(grant number 1908085QC135)Anhui Science and Technology Department,International Science&Technology Cooperation Plan(grant number 1804b06020344)+1 种基金Anhui Science and Technology DepartmentMajor Science and Technology Projects(grant number 201903a06020012).
文摘Nutrient boron(B)is important for crop development.The absorption and transport of B ions are regulated by the B transport(BOR)gene family.Although some members of the BOR gene family have been heavily researched,to the best of our knowledge,no comprehensive research on the structural,evolutionary and functional relationships among crops has been reported.In this study,comparative genomic research of the BOR gene family was performed in five crops,40 BOR genes were identified,and analyses of phylogenetics,structure,conserved motifs,and transmembrane topology were performed.These genes had highly similar physicochemical properties,structure and motif distribution.Specific elements in the C-terminus and functional differences were also found among the genes.In addition,microsynteny and evolutionary analysis suggested that large-scale replication events and purifying selection played essential roles during the OsBOR gene evolutionary process in rice.Moreover,expression pattern of OsBORs were also analyzed.Our research provides comprehensive and detailed information on BOR genes in five crops and establishes a foundation for further functional exploration of these genes in B metabolic pathways.
基金Project supported by the National Natural Science Foundation of China (Grant No 10774176)the National Basic Research Program of China (Grant Nos 2006CB806202 and 2006CB921305)the Shanghai Supercomputing Center,Chinese Academyof Sciences
文摘We investigate atomic and electronic structures of boron nanotubes （BNTs） by using the density functional theory （DFT）. The transport properties of BNTs with different diameters and chiralities are studied by the Keldysh nonequilibrium Green function （NEGF） method. It is found that the cohesive energies and conductances of BNTs decrease as their diameters decrease. It is more difficult to form （N, 0） tubes than （M, M） tubes when the diameters of the two kinds of tubes are comparable. However, the （N, 0） tubes have a higher conductance than the （M, M） tubes. When the BNTs are connected to gold electrodes, the coupling between the BNTs and the electrodes will affect the transport properties of tubes significantly.
基金Project supported by the Cultivation Fund of the Key Scientific and Technical Innovation Project,Ministry of Education of China(Grant No.708068)the Specialized Research Fund for the Doctoral Program of Higher Education,Ministry of Education of China(Grant No.200805301001)the Open Fund based on Innovation Platform of Hunan Colleges and Universities,China (Grant No.09K034)
文摘The transport properties of hexagonal boron-nitride nanoribbons under the uniaxial strain are investigated by the Green＇s function method. We find that the transport properties of armchair boron-nitride nanoribbon strongly depend on the strain. In particular, the features of the conductance steps such as position and width are significantly changed by strain. As a strong tensile strain is exerted on the nanoribbon, the highest conductance step disappears and subsequently a dip emerges instead. The energy band structure and the local current density of armchair boron nitride nanoribbon under strain are calculated and analysed in detail to explain these characteristics. In addition, the effect of strain on the conductance of zigzag boron-nitride nanoribbon is weaker than that of armchair boron nitride nanoribbon.
基金supported by the National Natural Science Foundation of China(Grant No.51671114)the Special Funding in the Project of the Taishan Scholar Construction EngineeringNational Key Research Program of China(Grant No.2016YFB0300501)
文摘Electronic transport properties of single-wall boron nanotube （BNT） with different chiralities, diameters, some of which are encapsulated with silicon, germanium, and boron nanowires are theoretically studied. The results indicate that the zigzag （3,3） BNT has more electronic transmission channels than the armchair （5,0） BNT because of its unique structure distortion. Nanowires encapsulated in the BNT can enhance the conductance of the BNT to some extent by providing a significant electronic transmission channel to the BNT. The effect of the structure of nanowires and the diameter of BNTs on the transport properties has also been discussed. The results of this paper can enrich the knowledge of the electron transport of the BNT and provide theoretical guidance for subsequent experimental study.
