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Search Results: 1 - 10 of 23590 matches for " Ya-long Liao "
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Leaching behavior of zinc and copper from zinc refinery residue and filtration performance of pulp under the hydrothermal process
Lei Cao,Ya-long Liao,Gong-chu Shi,Yu Zhang,Mu-yuan Guo
- , 2019, DOI: https://doi.org/10.1007/s12613-019-1706-z
Abstract: This study aims to investigate the leaching behavior and filtration performance of zinc refinery residue under hydrothermal conditions. The relationships between the structure and morphology of silicon in the leaching residue and the pulp filtration performance were explored by determining the pulp filtration speed, analyzing quantitatively the silicon content in the leachate, and characterizing the leaching residue structure. The results show that hydrothermal leaching induces the coagulation–hydrolysis of the silicon in solution, consequently altering the microstructure of the leaching residue, and that silicon oxygen tetrahedra ([SiO4]4?) form the main skeleton structure of the residue. The results obtained also show that the leaching rates of zinc and copper are 98.1% and 98.7%, respectively, and that the filtration speed is 526.32 L/(m2·h) under the conditions of sulfuric acid concentration of 140 g/L, leaching temperature of 160°C, leaching time of 3.0 h, oxygen partial pressure of 0.75 MPa, stirring speed of 600 r/min, and a liquid-to-solid ratio of 10 mL/g.
The FANTASTIC FOUR proteins influence shoot meristem size in Arabidopsis thaliana
Vanessa Wahl, Luise H Brand, Ya-Long Guo, Markus Schmid
BMC Plant Biology , 2010, DOI: 10.1186/1471-2229-10-285
Abstract: Here we show that a family of four plant-specific proteins, encoded by the FANTASTIC FOUR (FAF) genes, has the potential to regulate shoot meristem size in Arabidopsis thaliana. FAF2 and FAF4 are expressed in the centre of the shoot meristem, overlapping with the site of WUS expression. Consistent with a regulatory interaction between the FAF gene family and WUS, our experiments indicate that the FAFs can repress WUS, which ultimately leads to an arrest of meristem activity in FAF overexpressing lines. The finding that meristematic expression of FAF2 and FAF4 is under negative control by CLV3 further supports the hypothesis that the FAFs are modulators of the genetic circuit that regulates the meristem.This study reports the initial characterization of the Arabidopsis thaliana FAF gene family. Our data indicate that the FAF genes form a plant specific gene family, the members of which have the potential to regulate the size of the shoot meristem by modulating the CLV3-WUS feedback loop.In contrast to animals, plant development is highly plastic, with new organs being formed continuously from pools of stem cells maintained in structures called meristems. This plasticity allows plants, within certain limits, to adapt their body shape in response to developmental, physical and environmental cues. The ability to form new organs throughout their life cycle requires tight control of the meristems to avoid unregulated growth. Plants have evolved an elaborate genetic network that controls meristem size and maintenance [1,2]. At the core of the network that regulates the size of the stem cell population in the shoot meristem are the homeodomain transcription factor WUSCHEL (WUS) and the CLAVATA (CLV) ligand-receptor system [1,3-5]. WUS is expressed in the organizing centre (OC) of the meristem and positively regulates CLV3 expression in the stem cells, which are localized above the OC [6]. CLV3 encodes a small secreted peptide, which cell non-autonomously represses WUS in th
Advances in the study of systematics and evolution of the tribe Oryzeae (Poaceae)

GUO Ya-Long,GE Song,

植物分类学报 , 2006,
Abstract: 稻族Oryzeae是禾本科Poaceae中包含多种经济植物的重要类群,现有大约12个属,广布全球的热带和温带地区。由于其重要的经济价值和在理论研究上的代表性,稻属Oryza及其近缘属的研究受到了广泛关注。虽然形态学和初步的分子证据表明稻族是一个单系类群,但稻族内各属的分类处理和属间系统发育关系以及稻族的起源、地理分布式样和机制等方面仍存在许多悬而未决的问题。本文简要回顾了稻族系统学研究的历史,包括稻族的建立及其在禾本科中的系统位置、稻族的族下划分、稻族各属的界定及其系统发育关系。目前已有的研究结果表明:稻族是单系类群,可分为两个主要分支,相当于传统的两个亚族(Zizaniinae和Oryzinae),但稻族单性花小穗是多次起源的,不宜作为划分亚族的依据;一些单型属(Hydrochloa、Porteresia和Prosphytochloa)的建立得不到分子证据的支持;根据分子钟原理估计稻族两个主要分支(亚族)的分歧时间在大约2000万年前,而稻属和近缘属假稻属Leersia的分歧时间为1400万年:稻属内主要类群的分歧时间在900万年前左右。此外,本文还对稻族的生物地理学问题进行了初步探讨,对稻族系统发育和进化研究中存在的问题及未来研究方向进行了讨论。
The utility of mitochondrial nad1 intron in phylogenetic study of Oryzeae with reference to the systematic position of Porteresia

GUO Ya-Long,GE Song,

中国科学院研究生院学报 , 2004,
Abstract: In the study of plant systematics and evolution, the gene sequences of mitochondrial genome are less used for their low informative sites and complex structure compared to those of the nuclear and chloroplast genomes. In this study, we sequenced the intron 2 of mitochondrial nad1 gene to study the phylogeny of Oryzeae, in particular emphasizing the systematic position of Porteresia, a monotypic genus of Oryzeae with the only species P. coarctata. The results indicate that the tribe Oryzeae should be divided into two subtribes (Oryzinae and Zizaniinae) and that Leersia is the most closely related genus to Oryza. The present data clearly demonstrate that Porteresia coarctata should be treated as a member in Oryza rather than as a separate genus. The sequences of nad1 intron 2 are informative enough in Oryzeae, and thus appear appropriate for the phylogenetic study at higher taxonomic levels. The gaps, when treated appropriately, can provide additional information in phylogenetic study.
Application of PSO with Compression Factor in the Drum Pressure Control System

LIU Chang-Liang,GAO Ya-Long,

计算机系统应用 , 2012,
Abstract: In this paper,the principle of particle swarm algorithm,describes an improved algorithm which with compression factor of PSO,outlines the working principle of PID controllers,particle swarm optimization method implementation,and examples of the improved algorithm A drum pressure control system,optimize the use of matlab simulation show that the improved optimization algorithm outperforms the basic PSO,there are certain engineering applications in future.
Ultra Performance Liquid Chromatography-Based Metabonomic Study of Therapeutic Effect of the Surface Layer of Poria cocos on Adenine-Induced Chronic Kidney Disease Provides New Insight into Anti-Fibrosis Mechanism
Ying-Yong Zhao, Ya-Long Feng, Xu Bai, Xiao-Jie Tan, Rui-Chao Lin, Qibing Mei
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0059617
Abstract: The surface layer of Poria cocos (Fu-Ling-Pi, FLP) is commonly used in traditional Chinese medicine and its diuretic effect was confirmed in rat. Ultra performance liquid chromatography/quadrupole time-of-flight high-sensitivity mass spectrometry and a novel mass spectrometryElevated Energy data collection technique was employed to investigate metabonomic characteristics of chronic kidney disease (CKD) induced from adenine excess and the protective effects of FLP. Multiple metabolites are detected in the CKD and are correlated with progressive renal injury. Among these biomarkers, lysoPC(18:0), tetracosahexaenoic acid, lysoPC(18:2), creatinine, lysoPC (16:0) and lysoPE(22:0/0:0) in the FLP-treated group were completely reversed to levels in the control group which lacked CKD. Combined with biochemistry and histopathology results, the changes in serum metabolites indicate that the perturbations of phospholipids metabolism, energy metabolism and amino acid metabolism are related to adenine-induced CKD and to the interventions of FLP on all the three metabolic pathways. FLP may regulate the metabolism of these biomarkers, especially their efficient utilization within the context of CKD. Furthermore, these biomarkers might serve as characteristics to explain the mechanisms of FLP.
Dynamical tunneling-assisted coupling of high-Q deformed microcavities using a free-space beam
Qi-Fan Yang,Xue-Feng Jiang,Ya-Long Cui,Linbo Shao,Yun-Feng Xiao
Physics , 2012, DOI: 10.1103/PhysRevA.88.023810
Abstract: We investigate the efficient free-space excitation of high-Q resonance modes in deformed microcavities via dynamical tunneling-assisted coupling. A quantum scattering theory is employed to study the free-space transmission properties, and it is found that the transmission includes the contribution from (1) the off-resonance background and (2) the on-resonance modulation, corresponding to the absence and presence of high-Q modes, respectively. The theory predicts asymmetric Fano-like resonances around high-Q modes in background transmission spectra, which are in good agreement with our recent experimental results. Dynamical tunneling across Kolmogorov-Arnold-Moser tori is further studied, which plays an essential role in the Fano-like resonance. This efficient free-space coupling holds potential advantages in simplifying experimental condition and exciting high-Q modes in higher-index-material microcavities.
Large-scale identification of odorant-binding proteins and chemosensory proteins from expressed sequence tags in insects
Ya-Long Xu, Peng He, Lan Zhang, Shao-Qing Fang, Shuang-Lin Dong, Yong-Jun Zhang, Fei Li
BMC Genomics , 2009, DOI: 10.1186/1471-2164-10-632
Abstract: We have developed a computational pipeline to identify OBP and CSP genes from insect ESTs. In total, 752,841 insect ESTs were examined from 54 species covering eight Orders of Insecta. From these ESTs, 142 OBPs and 177 CSPs were identified, of which 117 OBPs and 129 CSPs are new. The complete open reading frames (ORFs) of 88 OBPs and 123 CSPs were obtained by electronic elongation. We randomly chose 26 OBPs from eight species of insects, and 21 CSPs from four species for RT-PCR validation. Twenty two OBPs and 16 CSPs were confirmed by RT-PCR, proving the efficiency and reliability of the algorithm. Together with all family members obtained from the NCBI (OBPs) or the UniProtKB (CSPs), 850 OBPs and 237 CSPs were analyzed for their structural characteristics and evolutionary relationship.A large number of new OBPs and CSPs were found, providing the basis for deeper understanding of these proteins. In addition, the conserved motif and evolutionary analysis provide some new insights into the evolution of insect OBPs and CSPs. Motif pattern fine-tune the functions of OBPs and CSPs, leading to the minor difference in binding sex pheromone or plant volatiles in different insect Orders.Insects are highly successful terrestrial animals that have complicated communication systems. Insect odorant binding proteins (OBPs) play an important role in insect chemical communication. Until recently, it was believed that pheromones and other odors entering the aqueous lumen of chemosensilla, were transported by OBPs to transmembrane odorant receptors (ORs) [1,2] and finally degraded by odorant degradation enzymes (ODEs) [3-7]. Recently, however, an active role of OBPs has been reported, where a conformational change of the OBP triggered by the presence of the ligand in its binding pocket that activated the membrane-bound receptor [8]. Insect OBPs, particularly in Lepidoptera, can be classified into two subfamilies, pheromone-binding proteins (PBPs) and general odorant binding proteins
Determination of hydraulic properties of purple soils via one-dimensional horizontal infiltration

CHENG Dong-Bing,ZHANG Ping-Cang,LI Ya-Long,CAI Chong-Fa,

中国生态农业学报 , 2010,
Abstract: he hydraulic properties of three unsaturated purple soils were determined by a simple horizontal infiltration method in one-dimensional horizontal infiltration experiment. While the study accurately estimates soil water retention curve, its estimates of soil water diffusion and conductivity are not very accurate. Estimated soil water diffusion and conductivity of the three purple soils by the simple infiltration method are 1~2 order of magnitude lower than that of the measured values. However, the model-estimated and measured variation tendencies of soil water diffusion and conductivity are similar. Under high soil water conditions, the estimated soil water diffusion and conductivity by the horizontal infiltration method are lower than that of the measured values. However, under low soil water conditions, the estimated soil water diffusion and conductivity by the horizontal infiltration method are higher than that of the measured values. This suggests that the model slowly responds to soil water change.
Cloud-Point Extraction Combined with Liquid Chromatography for the Determination of Ergosterol, a Natural Product with Diuretic Activity, in Rat Plasma, Urine, and Faeces
Dan-Qian Chen,Jun-Min An,Ya-Long Feng,Ting Tian,Xiang-Yang Qin,Ying-Yong Zhao
Journal of Analytical Methods in Chemistry , 2013, DOI: 10.1155/2013/479056
Abstract: Ergosterol from many medicinal fungi has been demonstrated to possess a variety of pharmacological activities in vivo and in vitro. A new method based on cloud-point extraction has been developed, optimized and validated for the determination of ergosterol in rat plasma, urine and faeces by liquid chromatography. The non-ionic surfactant Triton X-114 was chosen as the extract solvent. The chromatographic separation was performed on an Inertsil ODS-3 analytical column with a mobile phase consisting of methanol and water (98?:?2, v/v) at a flow rate of 1?mL/min. The methodology was validated completely. The results indicated good performance in terms of specificity, linearity, detection and quantification limits, precision and accuracy. The method was successfully applied to the pharmacokinetic studies of ergosterol in rats. The results indicate that the ergosterol levels in feces are much higher than those in plasma and urine of the rat. 1. Introduction Ergosterol is one of the best-known steroids, which exists widely in many medicinal fungi such as Polyporus umbellatus, Cordyceps sinensis, and Hypsizigus marmoreus [1–3]. We have recently reported the ergosterol has diuretic activity from Polyporus umbellatus [4]. Ergosterol has also been reported to possess cytotoxic activity [5] and anti-inflammatory activity [3]. Despite the fact that ergosterol showed multiple pharmacological activities, several pharmacokinetic and biochemical aspects of this compound remain unclear. However, the final effect of the drug in vivo might be influenced by many factors, such as body-and/or cell-compartment distribution, drug metabolism, lipophilicity, membrane permeability, and protein binding. So, these multiple pharmacological activities of ergosterol make it worth carrying out further study on pharmacokinetic properties and elimination pathway of ergosterol. A number of methods have been reported for the quantification of ergosterol in raw materials, such as high performance liquid chromatography-ultraviolet detection (HPLC-UV) [1, 6–11], high performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) [12, 13], and gas chromatography-mass spectrometry (GC-MS) [14–16]. To the best of our knowledge, there is no information describing the quantification of ergosterol in biological samples such as rat or human plasma, urine, and faeces. In addition, the effects on the elimination pathway of ergosterol have not been reported. In general, preclinical research including metabolism and pharmacokinetics of herbal medicine components are of great importance in
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