The Experts below are selected from a list of 288 Experts worldwide ranked by ideXlab platform
Svilen Bobev - One of the best experts on this subject based on the ideXlab platform.
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Ternary Compounds in the Sn-Rich Section of the Ba-Ga-Sn
2020Co-Authors: Marion C. Schäfer, Yuki Yamasaki, Veronika Fritsch, Svilen BobevAbstract:Abstract: Systematic syntheses in the Ba–Ga–Sn system confirmed the existence of a new ternary phase BaGa 1.79 Sn 4.21(2) (EuGa 2 Ge 4 structure type; orthorhombic Space Group Cmcm , Pearson symbol oS 28) with lattice parameters a = 4.5383(6) A, b = 12.2486(16) A, c = 14.3747(19) A. The structure is best viewed as an open-framework based on tetrahedrally coordinated Sn/Ga atoms with Ba atoms enclosed in the voids within it. The new phase co-precipitates with two other compounds with very similar compositions—Ba 8 Ga 14.5 Sn 31.5(4) (K 4 Si 23 structure type; Cubic Space Group Pm 3 , n Pearson symbol cP 54; a = 11.6800(12) A), and Ba 8 Ga 13.2 Sn 32.8(3) , (Eu 4 Ga 8 Ge 15 structure type; Cubic Space Group I4 , 3 m Pearson symbol cI 54; a = 11.5843(7) A). Detailed discussion on how syntheses affect the crystal chemistry, and the temperature dependence of the atomic displacement parameters, obtained from single-crystal structure refinements, are also reported in this article.
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Ternary Compounds in the Sn-Rich Section of the Ba–Ga–Sn System: Ba8Ga16–xSn30+x (1.1 ≤ x ≤ 2.8) Clathrates of Type-I and Type-VIII, and BaGa2–xSn4+x (x ≈ 0.2) with a Clathrate-like Structure
Crystals, 2011Co-Authors: Marion C. Schäfer, Yuki Yamasaki, Veronika Fritsch, Svilen BobevAbstract:Systematic syntheses in the Ba–Ga–Sn system confirmed the existence of a new ternary phase BaGa1.79Sn4.21(2) (EuGa2Ge4 structure type; orthorhombic Space Group Cmcm, Pearson symbol oS28) with lattice parameters a = 4.5383(6) A, b = 12.2486(16) A, c = 14.3747(19) A. The structure is best viewed as an open-framework based on tetrahedrally coordinated Sn/Ga atoms with Ba atoms enclosed in the voids within it. The new phase co-precipitates with two other compounds with very similar compositions—Ba8Ga14.5Sn31.5(4) (K4Si23 structure type; Cubic Space Group , Pearson symbol cP54; a = 11.6800(12) A), and Ba8Ga13.2Sn32.8(3), (Eu4Ga8Ge15 structure type; Cubic Space Group , Pearson symbol cI54; a = 11.5843(7) A). Detailed discussion on how syntheses affect the crystal chemistry, and the temperature dependence of the atomic displacement parameters, obtained from single-crystal structure refinements, are also reported in this article.
Steven L. Roderick - One of the best experts on this subject based on the ideXlab platform.
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Purification and crystallization of Pseudomonas aeruginosa chloramphenicol acetyltransferase
Proteins, 1997Co-Authors: Yu Tian, Todd W. Beaman, Steven L. RoderickAbstract:A chloramphenicol acetyltransferase from Pseudomonas aeruginosa genomic DNA has been overexpressed, refolded, purified, and crystallized. Crystals suitable for a three-dimensional x-ray structure determination were obtained from solutions of polyethyleneglycol methyl ether 2000 containing NiCl2 at pH 8.5. These crystals belong to the Cubic Space Group P41/332 (a = 154.8 A) and diffract x-rays to ≈3.2 A resolution. Proteins 28:298–300, 1997. © 1997 Wiley-Liss Inc.
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Crystallization of UDP-N-Acetylglucosamine O-Acyltransferase From Escherichia coli
Proteins, 1995Co-Authors: Ute Pfitzner, Christian R. H. Raetz, Steven L. RoderickAbstract:Crystals of UDP-N-acetylglucosamine O-acyltransferase (lpxA) fromEscherichia coli have been obtained from solutions of sodium/potassium phosphate and dimethylsulfoxide. These crystals belong to the Cubic Space Group P213 (a = 99.0 A), diffract X-raysto approximately 2.5 A resolution and contain one subunit of the enzyme in the asymmetric unit. © 1995 Wiley-Liss, Inc.
Makoto Nishiyama - One of the best experts on this subject based on the ideXlab platform.
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Purification, crystallization and preliminary X‐ray analysis of the regulatory subunit of aspartate kinase from Thermus thermophilus
Acta Crystallographica Section F-structural Biology and Crystallization Communications, 2007Co-Authors: Ayako Yoshida, Takeo Tomita, Tomohisa Kuzuyama, Makoto NishiyamaAbstract:Aspartate kinase (AK) from Thermus thermophilus, which catalyzes the first step of threonine and methionine biosynthesis, is regulated via feedback inhibition by the end product threonine. To elucidate the mechanism of regulation of AK, the regulatory subunit (the β subunit of T. thermophilus AK) was crystallized in the presence of the inhibitor threonine. Diffraction data were collected to 2.15 A at a synchrotron source. The crystal belongs to the Cubic Space Group P4332 or P4132, with unit-cell parameters a = b = c = 141.8 A.
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Purification, crystallization and preliminary X-ray analysis of the regulatory subunit of aspartate kinase from Thermus thermophilus.
Acta crystallographica. Section F Structural biology and crystallization communications, 2007Co-Authors: Ayako Yoshida, Takeo Tomita, Tomohisa Kuzuyama, Makoto NishiyamaAbstract:Aspartate kinase (AK) from Thermus thermophilus, which catalyzes the first step of threonine and methionine biosynthesis, is regulated via feedback inhibition by the end product threonine. To elucidate the mechanism of regulation of AK, the regulatory subunit (the beta subunit of T. thermophilus AK) was crystallized in the presence of the inhibitor threonine. Diffraction data were collected to 2.15 A at a synchrotron source. The crystal belongs to the Cubic Space Group P4(3)32 or P4(1)32, with unit-cell parameters a = b = c = 141.8 A.
Arndt Simon - One of the best experts on this subject based on the ideXlab platform.
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Dalton communications. The crystal structure of NaBa, an interpenetrating network of sodium tetrahedra and barium octahedra
Journal of The Chemical Society-dalton Transactions, 1994Co-Authors: G. Jeffrey Snyder, Arndt SimonAbstract:The crystal structure of NaBa has been determined from single-crystal X-ray diffraction data on X-ray capillary size samples cooled from 200 °C at a rate of 1 °C h–1[Cubic, Space Group Fdm, a= 17.027(3)A, structurally related to CdNi1–xand NiTi2].
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The crystal structure of NaBa, an interpenetrating network of sodium tetrahedra and barium octahedra
Journal of The Chemical Society-dalton Transactions, 1994Co-Authors: G. Jeffrey Snyder, Arndt SimonAbstract:The crystal structure of NaBa has been determined from single-crystal X-ray diffraction data on X-ray capillary size samples cooled from 200 o C at a rate of 1 o C h -1 [Cubic, Space Group Fd3m, a=17.027 (3) A, structurally related to CdNi 1-x and NiTi 2 ]
Yonglin An - One of the best experts on this subject based on the ideXlab platform.
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Copper‐Rich Framework Selenoarsenates Based on Icosahedral Cu8Se13 Clusters.
ChemInform, 2013Co-Authors: Renchun Zhang, Min Ji, Chi Zhang, Dao‐jun Zhang, Jun-jie Wang, Zhi-fei Zhang, Yonglin AnAbstract:The new isostructural compounds (IV), (V), and (VII) crystallize in the Cubic Space Group Fmc with Z = 2.
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Copper-Rich Framework Sulfides: A4Cu8Ge3S12 (A: K, Rb) with Cubic Perovskite Structure.
ChemInform, 2010Co-Authors: Renchun Zhang, Shou-hua Ji, Min Ji, Yonglin AnAbstract:The new title compounds (IV) are isotypic and crystallize in the Cubic Space Group Fmc with Z = 2.