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Search Results: 1 - 10 of 115227 matches for " Yan-Ju Liu "
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3-[2-Chloro-4-(trifluoromethyl)phenoxy]benzoic acid
Yan-Ju Liu,Jie Liu
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811043479
Abstract: The asymmetric unit of the title compound, C14H8ClF3O3, comprises two independent molecules. The rings in each molecule are connected together via O—H...O hydrogen bonds to form classical hydrogen-bonded carboxylic acid dimers. The dihedral angles between the benzene rings are 80.7 (1) and 68.7 (1)°.
4-Chloro-N-methylbenzamide
Juan Yuan,Yan-Ju Liu
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536812008641
Abstract: There are two molecules in the asymmetric unit of the title compound, C8H8ClNO, which are linked in the crystal structure via N—H...O hydrogen bonds into chains along the b axis. C—H...O contacts also occur. The benzene ring makes dihedral angles of 5.9 (1) and 16.7 (1)°with the attached amide group in the two independent molecules.
4-Methoxy-N-methylbenzamide
Juan Yuan,Yan-Ju Liu
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536812004746
Abstract: In the title compound, C9H11NO2, the dihedral angle between the amide group and the benzene ring is 10.6 (1)°. In the crystal, molecules are connected via N—H...O hydrogen bonds, supported by a C—H...O contact, forming chains along b. These chains are linked by C—H...π interactions to give a three-dimensional network.
5-Methoxy-1,3,4-thiadiazol-2(3H)-one
Wei-Yi Zhang,Jie Liu,Yan-Ju Liu
Acta Crystallographica Section E , 2012, DOI: 10.1107/s160053681200178x
Abstract: The three molecules in the asymmetric unit of the title compound, C3H4N2O2S, are connected via N—H...O hydrogen bonds, forming layers normal to [001]. The rings of the molecules are approximately planar, with r.m.s. deviations of 0.0051 (1), 0.0044 (1) and 0.0111 (1) .
5-Bromo-4-iodo-2-methylaniline
Yan-Ju Liu,Da-Shun Dai
Acta Crystallographica Section E , 2012, DOI: 10.1107/s160053681200921x
Abstract: The asymmetric unit of the title compound, C7H7BrIN, contains two independent molecules, which are linked by weak N—H...N hydroden-bonding interactions between the amino groups.
Metal bioaccumulation in plant leaves from an industrious area and the Botanical Garden in Beijing
LIU Yan-ju,DING Hui,ZHU Yong-guan,
LIU Yan-ju
,DING Hui,ZHU Yong-guan

环境科学学报(英文版) , 2005,
Abstract: The concentrations of Fe, Mn, Al, Zn, Pb, Ni, Cr, and As were measured in soils and leaves from 21 plant species growing on hills near the Beijing Steel Factory(BSF) and 17 plant species in the Beijing Botanical Garden(BBG). The results showed that soils from BSF were Zn contaminated according to the threshold of natural background of China. There was a metal contamination of the soils by Ni, and Cr in BSF comparing with those in BBG. The comparison between concentrations of metals in leaves from both sites indicated that, in general, accumulation of metals in the leaves of the same species was significantly different between the two sites. Even within the same locality each species accumulation of metals was significantly variable. The study aimed to screen landscape plants for the capacity to clean-up toxic metals in soils, and developed an overall metal accumulation index(MAI) for leaves and then categorized the MAI that can be applied broadly in the selection of species in polluted areas. To do this, the spectrum of MAI values were divided into four classes: strongly accumulated(SA or grade I), moderately accumulated(MA or grade II), intermediately accumulated(IA or grade III), and weakly accumulated(WA or grade IV). The results showed that elemental association between Fe, Al, Ni, and As was generally highly correlated with each other in the sampling sites. This may suggest their common biochemical characteristics. Generally, those species containing strong and moderate accumulation in both sites are considered including Vitex negundo, Broussonetia papyrifera, Ulmus pumila, and Rubia cordifolia. At BSF and other industrial sites with a similar ecosystem, strong and moderate accumulation species include Sophora japonica, Ampelopsis aconitifolia var. glabra, Platycladus orientalis, Wikstroemia chamaedaphne, Cleistogenes squarrosa, Grewia biloba, and in BBG, in addition Setaria viridis, Cotinus coggygria, Lespedeza floribunda, Rhamnus parvifolia, Lespedeza tomentosa.
Responses of Plants to Air Pollution and Their Significance in Urban Greening
植物对大气污染的反应与城市绿化

LIU Yan-Ju DING Hui,
刘艳菊
,丁辉

植物学报 , 2001,
Abstract: 大气污染是人类面临的最严峻问题之一,根据植物对大气污染的反应方式来选择城市绿化树种是减轻排放后大气污染物的一种重要补充工具。过去我国在植物对不同大气污染物反应特性方面的研究主要局限于:根据不同浓度的大气污染物对植物进行的熏气试验和现场观察植物叶片的宏观受害症状来粗略判断植物对不同污染物的抗性等级。因无统一的指标评价植物抗性能力,不同的方法得出同一植物对同种污染物抗性等级不同的矛盾结论。本文全面分析了近期国内外有关植物对大气污染物抗性特征方面的最新研究进展,建议利用植物在混合大气污染物作用下的宏观和微观、形态和解剖、生态和生理等方面的综合反应特性,科学地划分植物对大气污染物的抗性等级,结合植物的吸污能力,提出筛选绿化植物的合理化建议。
Azido{2-[bis(2-hydroxyethyl)amino]ethanolato-κ4N,O,O′,O′′}cobalt(II)
Yan-Ju Liu,Huai-Xia Yang,Juan Yuan,Xia Wang
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810047100
Abstract: In the title complex, [Co(C6H14NO3)(N3)] or [Co(teaH2)N3], the CoII atom resides in a trigonal–bipymidal O3N2 environment formed by three O atoms and one N atom from a simply deprotonated tetradentate triethanolamine ligand, and one N atom from an azide ligand. The O atoms define the equatorial plane whereas both N atoms are in axial positions. The mononuclear units are linked through O—H...O hydrogen-bonding interactions between the ethanol OH groups and the ethanolate O atom of a neighbouring complex into chains running parallel to [010].
The azide-bridged mixed-valent cobalt(II,III) compound [(CH3)3NH]2[CoIICo2III(N3)10]
Yan-Ju Liu,Yu-Xian Li,Min Xu,Xia Wang
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536810049421
Abstract: The crystal structure of the title compound, poly[bis(trimethylammonium) hexa-μ1,1-azido-tetraazidotricobaltate(II,III)], [(CH3)3NH]2[CoIICoIII2(N3)10], consists of anionic chains [CoIICoIII2(N3)10]2 extending parallel to the c axis and [(CH3)3NH]+ counter-cations situated between the chains. In the anionic chain, one tetrahedrally coordinated CoII atom (site symmetry 2) and two octahedrally coordinated CoIII atoms are arranged alternately and are linked by μ1,1-azide bridges. The anionic chains and cations are connected via N—H...N hydrogen bonding into a three-dimensional structure.
Dichloridobis[2-(2-furyl)-1-(2-furylmethyl)-1H-benzimidazole-κN3]cadmium(II)
Xia Wang,Yu-Xian Li,Yan-Ju Liu,Huai-Xia Yang
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810034409
Abstract: In the title complex, [CdCl2(C16H12N2O2)2], the CdII ion exhibits site symmetry 2. It shows a distorted tetrahedral coordination defined by two N atoms from symmetry-related 2-(2-furyl)-1-(2-furylmethyl)-1H-benzimidazole ligands and by two symmetry-related Cl atoms. Intramolecular C—H...O hydrogen bonds stabilize the molecular configuration. Adjacent molecules are linked through C—H...Cl hydrogen bonds into a network structure.
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