This article gives an elementary account of the recently proposed theory of spontaneous quantum gravity. It is argued that a viable quantum theory of gravity should be falsifiable, and hence it should dynamically expl...This article gives an elementary account of the recently proposed theory of spontaneous quantum gravity. It is argued that a viable quantum theory of gravity should be falsifiable, and hence it should dynamically explain the observed absence of quantum superpositions of space-time geometries in its classical limit.展开更多
The gene sod in Acidithiobacillusferrooxidans may play a crucial role in its tolerance to the extremely acidic, toxic and oxidative environment of bioleaching. For insight into the anti-toxic mechanism of the bacteria...The gene sod in Acidithiobacillusferrooxidans may play a crucial role in its tolerance to the extremely acidic, toxic and oxidative environment of bioleaching. For insight into the anti-toxic mechanism of the bacteria, a three-dimensional （3D） molecular structure of the protein encoded by this gene was built by homology modeling techniques, refined by molecular dynamics simulations, assessed by PROFILE-3D and PROSTAT programs and its key residues were further detected by evolutionary trace analysis. Through these procedures, some trace residues were identified and spatially clustered. Among them, the residues of Asn38, Glyl03 and Glul61 are randomly scattered throughout the mapped structure; interestingly, the other residues are all distinctly clustered in a subgroup near Fe atom. From these results, this gene can be confirmed at 3D level to encode the Fe-depending superoxide dismutase and subsequently play an anti-toxic role. Furthermore, the detected key residues around Fe binding site can be conjectured to be directly responsible for Fe binding and catalytic function.展开更多
The article considers the some geochemical characteristic of the loesslike and bottom sediments of the area Novo-Razvodnoy of the Irkutsk’s reservoir.Main objectives of this research are to determine contents of trac...The article considers the some geochemical characteristic of the loesslike and bottom sediments of the area Novo-Razvodnoy of the Irkutsk’s reservoir.Main objectives of this research are to determine contents of trace elements(V,Cr,Co,Ni,Cu,Zn,Ga,Pb,As,Rb,Sr,Y,Zr,Nb,Ba,La,Ce,Nd)and major elements(CaO,TiO2,MnO,Fe2O3(total))in the investigated samples by X-ray fluorescence analysis method(XRF),to establish the trace elements distribution dynamics on the lateral profile of the area Novo-Razvodnoy,to reveal the pollution degree of the studied sediments and to calculate the specific geochemical coefficients Rb/Sr and Ca/Sr in the studied sediments.As a result of the studies,it is established that the dried part of the coastal shallows experiences the higher technogenic load in comparison with other considered zones of the lateral profile.This fact was confirmed by the maximum content of As(12 mg kg^-1)exceeding by 6 times the established value of the maximum permissible concentrations in soils(MPC)and the maximum calculated values of pollution load index(PLI)and geoaccumulation index(Igeo)for arsenic.展开更多
Following the spirit of thermo field dynamics initiated by Takahashi and Umezawa, we employ the technique of integration within an ordered product of operators to derive the thermal vacuum state （TVS） for the Hamilt...Following the spirit of thermo field dynamics initiated by Takahashi and Umezawa, we employ the technique of integration within an ordered product of operators to derive the thermal vacuum state （TVS） for the Hamiltonian H of the two-coupled-oscillator model. The ensemble averages of the system are derived conveniently by using the TVS. In addition, the entropy for this system is discussed based on the relation between the generalized Hellmann-Feynman theorem and the entroy variation in the context of the TVS.展开更多
文摘This article gives an elementary account of the recently proposed theory of spontaneous quantum gravity. It is argued that a viable quantum theory of gravity should be falsifiable, and hence it should dynamically explain the observed absence of quantum superpositions of space-time geometries in its classical limit.
基金Project(2004CB619201) supported by the National Basic Research Program of ChinaProject (50321402) supported by the National Natural Science Foundation of China
文摘The gene sod in Acidithiobacillusferrooxidans may play a crucial role in its tolerance to the extremely acidic, toxic and oxidative environment of bioleaching. For insight into the anti-toxic mechanism of the bacteria, a three-dimensional （3D） molecular structure of the protein encoded by this gene was built by homology modeling techniques, refined by molecular dynamics simulations, assessed by PROFILE-3D and PROSTAT programs and its key residues were further detected by evolutionary trace analysis. Through these procedures, some trace residues were identified and spatially clustered. Among them, the residues of Asn38, Glyl03 and Glul61 are randomly scattered throughout the mapped structure; interestingly, the other residues are all distinctly clustered in a subgroup near Fe atom. From these results, this gene can be confirmed at 3D level to encode the Fe-depending superoxide dismutase and subsequently play an anti-toxic role. Furthermore, the detected key residues around Fe binding site can be conjectured to be directly responsible for Fe binding and catalytic function.
文摘The article considers the some geochemical characteristic of the loesslike and bottom sediments of the area Novo-Razvodnoy of the Irkutsk’s reservoir.Main objectives of this research are to determine contents of trace elements(V,Cr,Co,Ni,Cu,Zn,Ga,Pb,As,Rb,Sr,Y,Zr,Nb,Ba,La,Ce,Nd)and major elements(CaO,TiO2,MnO,Fe2O3(total))in the investigated samples by X-ray fluorescence analysis method(XRF),to establish the trace elements distribution dynamics on the lateral profile of the area Novo-Razvodnoy,to reveal the pollution degree of the studied sediments and to calculate the specific geochemical coefficients Rb/Sr and Ca/Sr in the studied sediments.As a result of the studies,it is established that the dried part of the coastal shallows experiences the higher technogenic load in comparison with other considered zones of the lateral profile.This fact was confirmed by the maximum content of As(12 mg kg^-1)exceeding by 6 times the established value of the maximum permissible concentrations in soils(MPC)and the maximum calculated values of pollution load index(PLI)and geoaccumulation index(Igeo)for arsenic.
基金supported by the National Natural Science Foundation of China (Grant Nos. 11175113 and 11264018)the Natural Science Foundation of Jiangxi Province, China (Grant Nos. 20132BAB212006, 20114BAB202004, and 2009GZW0006)+1 种基金the Research Foundation of the Education Department of Jiangxi Province, China (Grant No. GJJ12171)the Open Foundation of the Key Laboratory of Optoelectronic and Telecommunication of Jiangxi Province, China (Grant No. 2013004)
文摘Following the spirit of thermo field dynamics initiated by Takahashi and Umezawa, we employ the technique of integration within an ordered product of operators to derive the thermal vacuum state （TVS） for the Hamiltonian H of the two-coupled-oscillator model. The ensemble averages of the system are derived conveniently by using the TVS. In addition, the entropy for this system is discussed based on the relation between the generalized Hellmann-Feynman theorem and the entroy variation in the context of the TVS.
