The Experts below are selected from a list of 586113 Experts worldwide ranked by ideXlab platform
Min Song - One of the best experts on this subject based on the ideXlab platform.
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Proposed Mechanism of twin formation during hexagonal close packed structure to face centered cubic phase transition
Solid State Communications, 2018Co-Authors: Jianshi Yang, L C Liu, H R Gong, Min SongAbstract:Abstract Detailed process, critical energy, and critical shear stress of twin formation during hexagonal-close-packed (HCP) to face-centered-cubic (FCC) transition are Proposed through first principles calculation. It reveals that a lower critical energy is needed for HCP→FCC basal transition with twin formation than that without twin. The relative magnitude of critical shear stresses is strongly correlated with c/a ratio of HCP metals, and fundamentally determines the appearance of HCP→FCC basal transition and phase-transition twin. The predicted results bring about reasonable explanations to two puzzling points regarding Mg and twin formation in the literature.
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Proposed Mechanism of hcp fcc phase transition in titianium through first principles calculation and experiments
Scientific Reports, 2018Co-Authors: Jia Xi Yang, H.r. Gong, Min Song, Heng Lv Zhao, Qingqiang RenAbstract:By means of first principles calculation and experiments, a detailed Mechanism is Proposed to include the stages of slip, adjustment, and expansion for the HCP → FCC phase transformation with the prismatic relation of $${{\{}{10}\bar{{1}}{0}{\}}}_{{hcp}}{\parallel }{\{}{1}\bar{{1}}{0}{{\}}}_{{fcc}}$$ and $${{[}{0001}{]}}_{{hcp}}{\parallel }{[}{001}{{]}}_{{fcc}}$$ in titanium. It is revealed that the formation of four FCC layers is preferable after the slip of Shockley partial dislocations of 1/6 $$\langle {1}\bar{{2}}{10}\rangle $$ on $${\{}{10}\bar{{1}}{0}{\}}$$ planes, and that the adjustment of interplanar spacing and the volume expansion are energetically favorable and could happen spontaneously without any energy barrier. It is also found that the transformed FCC lattice first follows the c/a ratio (1.583) of HCP and then becomes an ideal FCC structure (c/a = √2). The Proposed Mechanism could not only provide a deep understanding to the process of HCP → FCC prismatic transformation in titanium, but also clarify the controversy regarding volume expansion of HCP-FCC phase transition of titanium in the literature.
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Proposed Mechanism of HCP → FCC phase transition in titianium through first principles calculation and experiments
Nature Publishing Group, 2018Co-Authors: Jia Xi Yang, H.r. Gong, Min Song, Heng Lv Zhao, Qingqiang RenAbstract:Abstract By means of first principles calculation and experiments, a detailed Mechanism is Proposed to include the stages of slip, adjustment, and expansion for the HCP → FCC phase transformation with the prismatic relation of $${{\{}{10}\bar{{1}}{0}{\}}}_{{hcp}}{\parallel }{\{}{1}\bar{{1}}{0}{{\}}}_{{fcc}}$$ { 10 1 ¯ 0 } hcp ∥ { 1 1 ¯ 0 } fcc and $${{[}{0001}{]}}_{{hcp}}{\parallel }{[}{001}{{]}}_{{fcc}}$$ [ 0001 ] hcp ∥ [ 001 ] fcc in titanium. It is revealed that the formation of four FCC layers is preferable after the slip of Shockley partial dislocations of 1/6 $$\langle {1}\bar{{2}}{10}\rangle $$ 〈 1 2 ¯ 10 〉 on $${\{}{10}\bar{{1}}{0}{\}}$$ { 10 1 ¯ 0 } planes, and that the adjustment of interplanar spacing and the volume expansion are energetically favorable and could happen spontaneously without any energy barrier. It is also found that the transformed FCC lattice first follows the c/a ratio (1.583) of HCP and then becomes an ideal FCC structure (c/a = √2). The Proposed Mechanism could not only provide a deep understanding to the process of HCP → FCC prismatic transformation in titanium, but also clarify the controversy regarding volume expansion of HCP-FCC phase transition of titanium in the literature
Aaron Klug - One of the best experts on this subject based on the ideXlab platform.
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the crystal structure of an all rna hammerhead ribozyme a Proposed Mechanism for rna catalytic cleavage
Cell, 1995Co-Authors: William G. Scott, J T Finch, Aaron KlugAbstract:We have solved the crystal structure of an all-RNA hammerhead ribozyme having a single 2'-O-methyl cytosine incorporated at the active site to prevent cleavage. The conditions used differ from those in another recent solution in four significant ways: first, it is an all-RNA ribozyme rather than a DNA-RNA hybrid; second, the connectivity of the ribozyme backbone strands is different; third, the crystals were grown in the presence of a much lower concentration of salt; and fourth, the crystal packing scheme is very different. Nevertheless, the three-dimensional structure of the all-RNA hammerhead ribozyme is similar to the previous structure. Five potential Mg(II)-binding sites are identified, including one positioned near the ribozyme catalytic pocket. Upon this basis, as well as upon comparisons with the metal-binding sites in the structurally homologous uridine turn of tRNAPhe, we propose a Mechanism for RNA catalytic cleavage.
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the crystal structure of an aii rnahammerhead ribozyme a Proposed Mechanism for rna catalytic cleavage
Cell, 1995Co-Authors: William G. Scott, J T Finch, Aaron KlugAbstract:We have solved the crystal structure of an all-RNA hammerhead ribozyme having a single 2'-O-methyl cytosine incorporated at the active site to prevent cleavage. The conditions used differ from those in another recent solution in four significant ways: first, it is an all-RNA ribozyme rather than a DNA-RNA hybrid; second, the connectivity of the ribozyme backbone strands is different; third, the crystals were grown in the presence of a much lower concentration of salt; and fourth, the crystal packing scheme is very different. Nevertheless, the three-dimensional structure of the all-RNA hammerhead ribozyme is similar to the previous structure. Five potential Mg(II)-binding sites are identified, including one positioned near the ribozyme catalytic pocket. Upon this basis, as well as upon comparisons with the metal-binding sites in the structurally homologous uridine turn of tRNAPhe, we propose a Mechanism for RNA catalytic cleavage.
Qingqiang Ren - One of the best experts on this subject based on the ideXlab platform.
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Proposed Mechanism of hcp fcc phase transition in titianium through first principles calculation and experiments
Scientific Reports, 2018Co-Authors: Jia Xi Yang, H.r. Gong, Min Song, Heng Lv Zhao, Qingqiang RenAbstract:By means of first principles calculation and experiments, a detailed Mechanism is Proposed to include the stages of slip, adjustment, and expansion for the HCP → FCC phase transformation with the prismatic relation of $${{\{}{10}\bar{{1}}{0}{\}}}_{{hcp}}{\parallel }{\{}{1}\bar{{1}}{0}{{\}}}_{{fcc}}$$ and $${{[}{0001}{]}}_{{hcp}}{\parallel }{[}{001}{{]}}_{{fcc}}$$ in titanium. It is revealed that the formation of four FCC layers is preferable after the slip of Shockley partial dislocations of 1/6 $$\langle {1}\bar{{2}}{10}\rangle $$ on $${\{}{10}\bar{{1}}{0}{\}}$$ planes, and that the adjustment of interplanar spacing and the volume expansion are energetically favorable and could happen spontaneously without any energy barrier. It is also found that the transformed FCC lattice first follows the c/a ratio (1.583) of HCP and then becomes an ideal FCC structure (c/a = √2). The Proposed Mechanism could not only provide a deep understanding to the process of HCP → FCC prismatic transformation in titanium, but also clarify the controversy regarding volume expansion of HCP-FCC phase transition of titanium in the literature.
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Proposed Mechanism of HCP → FCC phase transition in titianium through first principles calculation and experiments
Nature Publishing Group, 2018Co-Authors: Jia Xi Yang, H.r. Gong, Min Song, Heng Lv Zhao, Qingqiang RenAbstract:Abstract By means of first principles calculation and experiments, a detailed Mechanism is Proposed to include the stages of slip, adjustment, and expansion for the HCP → FCC phase transformation with the prismatic relation of $${{\{}{10}\bar{{1}}{0}{\}}}_{{hcp}}{\parallel }{\{}{1}\bar{{1}}{0}{{\}}}_{{fcc}}$$ { 10 1 ¯ 0 } hcp ∥ { 1 1 ¯ 0 } fcc and $${{[}{0001}{]}}_{{hcp}}{\parallel }{[}{001}{{]}}_{{fcc}}$$ [ 0001 ] hcp ∥ [ 001 ] fcc in titanium. It is revealed that the formation of four FCC layers is preferable after the slip of Shockley partial dislocations of 1/6 $$\langle {1}\bar{{2}}{10}\rangle $$ 〈 1 2 ¯ 10 〉 on $${\{}{10}\bar{{1}}{0}{\}}$$ { 10 1 ¯ 0 } planes, and that the adjustment of interplanar spacing and the volume expansion are energetically favorable and could happen spontaneously without any energy barrier. It is also found that the transformed FCC lattice first follows the c/a ratio (1.583) of HCP and then becomes an ideal FCC structure (c/a = √2). The Proposed Mechanism could not only provide a deep understanding to the process of HCP → FCC prismatic transformation in titanium, but also clarify the controversy regarding volume expansion of HCP-FCC phase transition of titanium in the literature
William G. Scott - One of the best experts on this subject based on the ideXlab platform.
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the crystal structure of an all rna hammerhead ribozyme a Proposed Mechanism for rna catalytic cleavage
Cell, 1995Co-Authors: William G. Scott, J T Finch, Aaron KlugAbstract:We have solved the crystal structure of an all-RNA hammerhead ribozyme having a single 2'-O-methyl cytosine incorporated at the active site to prevent cleavage. The conditions used differ from those in another recent solution in four significant ways: first, it is an all-RNA ribozyme rather than a DNA-RNA hybrid; second, the connectivity of the ribozyme backbone strands is different; third, the crystals were grown in the presence of a much lower concentration of salt; and fourth, the crystal packing scheme is very different. Nevertheless, the three-dimensional structure of the all-RNA hammerhead ribozyme is similar to the previous structure. Five potential Mg(II)-binding sites are identified, including one positioned near the ribozyme catalytic pocket. Upon this basis, as well as upon comparisons with the metal-binding sites in the structurally homologous uridine turn of tRNAPhe, we propose a Mechanism for RNA catalytic cleavage.
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the crystal structure of an aii rnahammerhead ribozyme a Proposed Mechanism for rna catalytic cleavage
Cell, 1995Co-Authors: William G. Scott, J T Finch, Aaron KlugAbstract:We have solved the crystal structure of an all-RNA hammerhead ribozyme having a single 2'-O-methyl cytosine incorporated at the active site to prevent cleavage. The conditions used differ from those in another recent solution in four significant ways: first, it is an all-RNA ribozyme rather than a DNA-RNA hybrid; second, the connectivity of the ribozyme backbone strands is different; third, the crystals were grown in the presence of a much lower concentration of salt; and fourth, the crystal packing scheme is very different. Nevertheless, the three-dimensional structure of the all-RNA hammerhead ribozyme is similar to the previous structure. Five potential Mg(II)-binding sites are identified, including one positioned near the ribozyme catalytic pocket. Upon this basis, as well as upon comparisons with the metal-binding sites in the structurally homologous uridine turn of tRNAPhe, we propose a Mechanism for RNA catalytic cleavage.
Jia Xi Yang - One of the best experts on this subject based on the ideXlab platform.
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Proposed Mechanism of hcp fcc phase transition in titianium through first principles calculation and experiments
Scientific Reports, 2018Co-Authors: Jia Xi Yang, H.r. Gong, Min Song, Heng Lv Zhao, Qingqiang RenAbstract:By means of first principles calculation and experiments, a detailed Mechanism is Proposed to include the stages of slip, adjustment, and expansion for the HCP → FCC phase transformation with the prismatic relation of $${{\{}{10}\bar{{1}}{0}{\}}}_{{hcp}}{\parallel }{\{}{1}\bar{{1}}{0}{{\}}}_{{fcc}}$$ and $${{[}{0001}{]}}_{{hcp}}{\parallel }{[}{001}{{]}}_{{fcc}}$$ in titanium. It is revealed that the formation of four FCC layers is preferable after the slip of Shockley partial dislocations of 1/6 $$\langle {1}\bar{{2}}{10}\rangle $$ on $${\{}{10}\bar{{1}}{0}{\}}$$ planes, and that the adjustment of interplanar spacing and the volume expansion are energetically favorable and could happen spontaneously without any energy barrier. It is also found that the transformed FCC lattice first follows the c/a ratio (1.583) of HCP and then becomes an ideal FCC structure (c/a = √2). The Proposed Mechanism could not only provide a deep understanding to the process of HCP → FCC prismatic transformation in titanium, but also clarify the controversy regarding volume expansion of HCP-FCC phase transition of titanium in the literature.
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Proposed Mechanism of HCP → FCC phase transition in titianium through first principles calculation and experiments
Nature Publishing Group, 2018Co-Authors: Jia Xi Yang, H.r. Gong, Min Song, Heng Lv Zhao, Qingqiang RenAbstract:Abstract By means of first principles calculation and experiments, a detailed Mechanism is Proposed to include the stages of slip, adjustment, and expansion for the HCP → FCC phase transformation with the prismatic relation of $${{\{}{10}\bar{{1}}{0}{\}}}_{{hcp}}{\parallel }{\{}{1}\bar{{1}}{0}{{\}}}_{{fcc}}$$ { 10 1 ¯ 0 } hcp ∥ { 1 1 ¯ 0 } fcc and $${{[}{0001}{]}}_{{hcp}}{\parallel }{[}{001}{{]}}_{{fcc}}$$ [ 0001 ] hcp ∥ [ 001 ] fcc in titanium. It is revealed that the formation of four FCC layers is preferable after the slip of Shockley partial dislocations of 1/6 $$\langle {1}\bar{{2}}{10}\rangle $$ 〈 1 2 ¯ 10 〉 on $${\{}{10}\bar{{1}}{0}{\}}$$ { 10 1 ¯ 0 } planes, and that the adjustment of interplanar spacing and the volume expansion are energetically favorable and could happen spontaneously without any energy barrier. It is also found that the transformed FCC lattice first follows the c/a ratio (1.583) of HCP and then becomes an ideal FCC structure (c/a = √2). The Proposed Mechanism could not only provide a deep understanding to the process of HCP → FCC prismatic transformation in titanium, but also clarify the controversy regarding volume expansion of HCP-FCC phase transition of titanium in the literature
