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Your search keyword '"Zeng, X.-R."' showing total 102 results
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102 results on '"Zeng, X.-R."'

4. Fabrication and application of co-continuous Al2O3/Al composite by reactive infiltration of molten Al into the preform of SiO2with cordierite addition

Author

Li, J. Q., Xie, S. H., Zhuang, Y. H., and Zeng, X. R.

Abstract

Interpenetration Al2O3/Al(Si) composites were fabricated by reactive infiltration of molten Al into the preforms with SiO2–4.6 mol.% cordierite at 1150 °C in air. The formation kinetics and microstructures of the composites were investigated. Experimental results show that the addition of cordierite in SiO2is favorable for wetting of molten Al on the preform, leading to high growth rate of the composite (8.76 mm min –1). The growth rate of the composite was controlled by the infiltration of molten Al into the preform through the open pores and cracks formed during the preform fabrication or through microcracks created during the infiltration process. Since the addition of cordierite in SiO2can lower the preform sintering temperature, one of its applications is used for ceramic – ceramic or ceramic – metal joints. A strong Al2O3–Al2O3joint with a shear strength of 109 MPa was fabricated and investigated using the Al2O3/Al(Si) interlayer formed by this method.

Published
2022
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6. P3822Esophageal cancer related gene-4 affects multiple ion channel expression in human-induced stem cell-derived cardiomyocytes

Author

Lan, H, primary, Xu, Q, additional, El-Battrawy, I, additional, Li, X, additional, Zhao, Z, additional, Lang, S, additional, Cyganek, L, additional, Zimmermann, W H, additional, Wieland, T, additional, Zeng, X R, additional, Dang, X T, additional, Borggrefe, M, additional, Zhou, X B, additional, and Akin, I, additional

Published
2018
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9. Anomalous thermal expansion in the deep super-cooled liquid region of a ZrCuAlAg bulk metallic glass.

Author

Hu, Q., Wang, J. M., Yan, Y. H., Luo, F. F., Guo, S., Liu, J., Chen, S. S., Huang, B., Lu, D. P., Zou, J. Z., and Zeng, X. R.

Subjects
THERMAL expansion, METALLIC glasses, NANOCRYSTALS, VISCOUS flow, CRYSTAL grain boundaries
Abstract

Bulk metallic glasses (BMGs), like other glasses, soften in the super-cooled liquid region (SCLR). Here in this work, surprisingly, a large expansion is reported occurring in the deep SCLR of a Zr47Cu37Al8Ag8BMG. Nano-crystals (NCs) are found precipitated during the anomalous expansion of Zr47Cu37Al8Ag8, but also in the SCLR of Zr43Cu41Al8Ag8that exhibits a conventional softening. It is found that there is a steep composition and density change at the NCs/amorphous matrix transition region in the former alloy, and this transition region exerts a thermal stress of about 0.15 MPa to the surrounding super-cooled liquid (SCL) and drives the soft SCL to expand severely. [ABSTRACT FROM PUBLISHER]

Published
2018
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18. Retraction of articles by H. Zhonget al.

Author

Zhong, H., primary, Duan, S.-H., additional, Hong, Y.-P., additional, Li, M.-L., additional, Liu, Y.-Q., additional, Luo, C.-J., additional, Luo, Q.-Y., additional, Xiao, S.-Z., additional, Xie, H.-L., additional, Xu, Y.-P., additional, Yang, X.-M., additional, Zeng, X.-R., additional, and Zhong, Q. Y., additional

Published
2009
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43. cis-Dichloro­bis(1,10-phenanthroline)cobalt(II).

Author

Zhong, H., Zeng, X.-R., and Luo, Q.-Y.

Subjects
*COBALT, *COBALT compounds, *TRANSITION metal compounds, *METAL complexes, *MACROMOLECULES, *SUPRAMOLECULAR chemistry, *PHYSICAL & theoretical chemistry
Abstract

In the mol­ecule of the title compound, cis-[CoCl2(C12H8N2)2], the CoII atom has a distorted octa­hedral coordination formed by four N atoms from two 1,10-phenanthroline ligands and two Cl atoms. In the crystal structure, mol­ecules are linked into a three-dimensional framework by C—H⋯Cl hydrogen bonds. The supra­molecular network is also consolidated by π–π stacking inter­actions. [ABSTRACT FROM AUTHOR]

Published
2006
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44. Tris(quinolin-8-olato-κ2 N, O)cobalt(III) glyoxal hemisolvate monohydrate.

Author

Zhong, H., Zeng, X.-R., Liu, Y.-Q., and Luo, Q.-Y.

Subjects
*CHEMICAL research, *ORGANIC compounds, *ATOMS, *MOLECULAR structure, *BIOLOGICAL systems, *METHODOLOGY
Abstract

In the mol­ecule of the title compound, [Co(C9H6NO)3]·0.5C2H2O2·H2O, the Co atom has an octa­hedral coordination formed by three O and three N atoms from three quinolin-8-olate ligands. In the crystal structure, mol­ecules are linked into a three-dimensional framework by O—H⋯O hydrogen bonds. The supra­molecular structure is also consolidated by π–π stacking inter­actions. The glyoxal molecule lies on an inversion centre. [ABSTRACT FROM AUTHOR]

Published
2006
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45. Aqua­chloro­bis(1,10-phenanthroline)nickel(II) chloride thio­acetamide solvate.

Author

Zhong, H., Zeng, X.-R., and Luo, Q.-Y.

Subjects
*CHEMICAL research, *CHARGE exchange, *AROMATIC compounds, *BENZIMIDAZOLES, *QUINOLINE, *CRYSTALLOGRAPHY
Abstract

The Ni atom in the cation of the title complex, [NiCl(C12H8N2)2(H2O)]Cl·C2H5NS, has a distorted octa­hedral coordination geometry defined by a Cl atom, the O atom of a water mol­ecule, and four N atoms from two phen ligands. Mol­ecules are linked into a three-dimensional framework primarily by O—H⋯Cl hydrogen bonds and π–π stacking inter­actions. [ABSTRACT FROM AUTHOR]

Published
2006
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46. Characterization of the p125 subunit of human DNA polymerase delta and its deletion mutants. Interaction with cyclin-dependent kinase-cyclins.

Author

Wu, S M, Zhang, P, Zeng, X R, Zhang, S J, Mo, J, Li, B Q, and Lee, M Y

Abstract

The catalytic subunit of human DNA polymerase (pol) delta was overexpressed in an active, soluble form by the use of a baculovirus system in insect cells. The recombinant enzyme was separated from endogenous DNA polymerases by phosphocellulose, Mono Q-Sepharose, and single-stranded DNA-cellulose chromatography. Recombinant DNA pol delta was also purified by immunoaffinity chromatography. The enzymatic properties of the purified catalytic subunit were characterized. The enzyme was active and possessed both DNA polymerase and associated 3' to 5' exonuclease activities. NH2-terminal deletion mutants retained polymerase activity, whereas the core and COOH-terminal deletion mutants were devoid of any measurable activities. Coinfection of Sf9 cells with recombinant baculovirus vectors for pol delta and cyclin-dependent kinase (cdk)-cyclins followed by metabolic labeling with 32Pi showed that the recombinant catalytic subunit of pol delta could be hyperphosphorylated by G1 phase-specific cdk-cyclins. When cdk2 was coexpressed with pol delta in Sf9 cells, pol delta was found to coimmunoprecipitate with antibodies against cdk2. Experiments with deletion mutants of pol delta showed that the NH2-terminal region was essential for this interaction. Coimmunoprecipitation and Western blot experiments in Molt 4 cells confirmed the interaction in vivo. Preliminary experiments showed that phosphorylation of the catalytic subunit of pol delta by cdk2-cyclins had little or no effect on the specific activity of the enzyme.

Published
1998

48. A conserved region in the amino terminus of DNA polymerase delta is involved in proliferating cell nuclear antigen binding.

Author

Zhang, S J, Zeng, X R, Zhang, P, Toomey, N L, Chuang, R Y, Chang, L S, and Lee, M Y

Abstract

Synthetic peptides to selected sequences in human DNA polymerase delta (pol delta) were used to identify the region involved in the interaction of pol delta to proliferating cell nuclear antigen. Peptides corresponding to sequences in five regions in the amino terminus of human pol delta and three in the carboxyl terminus, which are conserved with the yeast homologs of pol delta, were tested. These studies showed that the peptide corresponding to the N2 region (residues 129-149) selectively and specifically inhibited the PCNA stimulation of pol delta. This inhibition was relieved by titration with excess PCNA. The identification of the N-2 region as being involved in PCNA binding was supported by studies that demonstrated that the N2 peptide could bind PCNA. Deletion mutants of pol delta expressed in Sf9 cells provided evidence that the binding region for PCNA was located in the first 182 residues of the amino terminus. These studies provide reasonable evidence that residues within the region 129-149 of pol delta are involved in the binding site for PCNA.

Published
1995

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