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Search Results: 1 - 10 of 74015 matches for " NIU Yu-Mei "
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牙髓干细胞在牙髓牙本质再生中的研究进展
Research Progress of Dental Pulp Stem Cells in Dentin and Dental Pulp Regeneration.

牛玉梅,何丽娜
NIU Yu-mei
, HE Li-na.

- , 2018, DOI: 10.13701/j.cnki.kqyxyj.2018.09.001
Abstract: 摘要 近年来,以牙髓干细胞作为种子细胞实现牙髓牙本质再生的研究受到国内外学者的广泛关注。学者们应用组织工程技术,从支架材料、生长因子以及共同的微环境等多方面进行探索,试图寻找到更理想的方法将牙髓干细胞应用于牙髓牙本质再生。本文将概述牙髓干细胞在牙髓牙本质再生中的研究进展
2-Hydroxy-4-methoxybenzaldehyde thiosemicarbazone
Yu-Mei Hao
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810029594
Abstract: The title Schiff base compound, C9H11N3O2S, was prepared by the reaction of equimolar quantities of 2-hydroxy-4-methoxybenzaldehyde with thiosemicarbazide in methanol. The molecule adopts a trans configuration with respect to the azomethine group and an intramolecular O—H...N hydrogen bond generates an S(6) ring. In the crystal structure, molecules are linked through intermolecular N—H...O and N—H...S hydrogen bonds, forming a three-dimensional network.
2-Chloro-5-nitrobenzaldehyde thiosemicarbazone
Yu-Mei Hao
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810035701
Abstract: The title Schiff base compound, C8H7ClN4O2S, was prepared by the reaction of equimolar quantities of 2-chloro-5-nitrobenzaldehyde with thiosemicarbazide in methanol. The molecule adopts a trans configuration with respect to the azomethine group and the dihedral angle between the benzene ring and the thiosemicarbazide group is 6.8 (3)°. In the crystal, molecules are linked through intermolecular N—H...S hydrogen bonds, forming chains propagating in [010].
1-[(2-Anilinoethyl)iminiomethyl]-2-naphtholate
Yu-Mei Hao
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809019096
Abstract: The title Schiff base compound, C19H18N2O, was prepared by the reaction of equimolar quantities of 2-hydroxy-1-naphthaldehyde with N-phenylethane-1,2-diamine in a methanol solution. The molecule adopts a zwitterionic conformation with the naphthyl OH group deprotonated and the imine N atom protonated. An intramolecular N—H...O hydrogen bond forms between them. The dihedral angle between the benzene ring and the naphthyl system is 86.9 (2)°. In the crystal structure, molecules are linked through intermolecular N—H...O hydrogen bonds, forming chains running along the b axis.
3-Hydroxy-N′-(2-methoxybenzylidene)-2-naphthohydrazide
Yu-Mei Hao
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809043086
Abstract: In the title Schiff base compound, C19H16N2O3, the dihedral angle between the mean planes of the benzene ring and the naphthyl ring system is 0.8 (2)°. The mean plane of the hydrazide group forms dihedral angles of 2.0 (2) and 2.2 (2)°, respectively, with the mean planes of the benzene ring and the naphthyl ring system. A strong intramolecular N—H...O hydrogen bond is present. In the crystal, intermolecular O—H...O hydrogen bonds form chains along the c axis and help to provide stability in the crystal packing.
2-Bromo-4-chloro-6-(cyclopentyliminomethyl)phenol
Yu-Mei Hao
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809039142
Abstract: All atoms of the title molecule, C12H13BrClNO, except the C and H atoms of the cyclopentane methylene groups lie on a crystallographic mirror plane. The cyclopentane ring adopts an envelope conformation and an intramolecular O—H...N hydrogen bond is observed. In the crystal, molecules are stacked along the b axis by π–π interactions [centroid–centroid distance = 3.6424 (11) ].
N′-[(2-Hydroxy-1-naphthyl)methylidene]-2-nitrobenzohydrazide
Yu-Mei Hao
Acta Crystallographica Section E , 2010, DOI: 10.1107/s160053681001490x
Abstract: In the title Schiff base compound, C18H13N3O4, prepared by the reaction of 2-hydroxy-1-naphthaldehyde with 2-nitrobenzohydrazide, the dihedral angle between the benzene ring and naphthyl ring system is 23.0 (2)°. There is an intramolecular O—H...N hydrogen bond involving the naphthalene hydroxy substituent and a hydrazide N atom. In the crystal structure, symmetry-related molecules are linked through intermolecular N—H...O hydrogen bonds, forming chains propagating in [101].
N′-(5-Chloro-2-hydroxybenzylidene)-2-methoxybenzohydrazide
Yu-Mei Hao
Acta Crystallographica Section E , 2010, DOI: 10.1107/s160053681002180x
Abstract: The title Schiff base compound, C15H13ClN2O3, was prepared by the reaction of equimolar quantities of 5-chloro-2-hydroxybenzaldehyde with 2-methoxybenzohydrazide in a methanol solution. The dihedral angle between the two benzene rings is 20.6 (3)°. An intramolecular O—H...N hydrogen bond may influence the molecular conformation. In the crystal structure, molecules form chains along the b direction via intermolecular N—H...O hydrogen bonds which are bifurcated involving an intramolecular N—H...O hydrogen bond.
N′-(2-Chlorobenzylidene)-4-hydroxybenzohydrazide
Yu-Mei Hao
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809030797
Abstract: In the molecule of the title compound, C14H11ClN2O2, the dihedral angle between the benzene rings is 30.53 (4)°. In the crystal structure, intermolecular O—H...O and N—H...O hydrogen bonds link the molecules into a two-dimensional network. π–π contacts between benzene rings [centroid–centroid distance = 3.619 (1) ] may further stabilize the structure. The crystal studied was found to be an inversion twin.
Synthesis of Mixed Carbonates via a Three-Component Coupling of Alcohols, CO2, and Alkyl Halides in the Presence of K2CO3 and Tetrabutylammonium Iodide
Min Shi,Yu-Mei Shen
Molecules , 2002, DOI: 10.3390/70400386
Abstract: Various mixed carbonates can be conveniently prepared in good yields using the corresponding alcohols, alkyl halides under CO2 atmosphere in the presence of potassium carbonate or sodium carbonate and tetrabutylammonium iodide.
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