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Search Results: 1 - 10 of 36891 matches for " Liyu Zhao "
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A Framework of Research and Practice: Relationship between Work Engagement, Affective Commitment, and Turnover Intentions  [PDF]
Liyu Zhao, Jingchao Zhao
Open Journal of Social Sciences (JSS) , 2017, DOI: 10.4236/jss.2017.510019
Abstract:
There is a growing research interest in the topic of work engagement over the past years. In reference to Schauefeli, Salanova, Gonzalez-Roma & Bakker (2002) [1], work engagement is described as “a positive, fulfilling work-related state of mind that is characterized by vigor, dedication and absorption”. As compare to the researches based on the relationship between work engagement and organizational commitment and job performance, the existing researches on the relationship between work engagement and turnover intentions are far fewer. We theoretically discussed the relationship among work engagement, affective commitment and turnover intentions. Research results show that work engagement is negatively related to turnover intentions whereby affective commitment plays a regulating role. Affective commitment moderates the relationship between work engagement and turnover intentions whereby employees’ affective commitment is stronger and employees are more willing to invest effort in their work; hence, employees’ turnover intentions are reduced.
WOOD FRACTURE PATTERN DURING THE WATER DESORPTION PROCESS
Wang,Liyu; Zhao,Guangjie; Lu,Zhenyou;
Maderas. Ciencia y tecnología , 2006, DOI: 10.4067/S0718-221X2006000100003
Abstract: wood is a hygroscopic material and its mechanical properties change with moisture content below the fiber saturation point. fracture characteristic is one of most important mechanical properties of wood and often is taken as an important safety design factor for wood as an engineered structural material. the aim of this paper is to investigate the effect of moisture content changes on wood fracture properties, focusing on fracture behavior and patterns with different crack orientations of betula platyphylla suk. and pinus bungeana in two different desorption processes. these two desorption processes were, respectively, from fiber saturation point to an equilibrium moisture content corresponding to 82.4 %rh at 20°c and from 82.4 %rh to 35.2 %rh at the same temperature of 20 °c
WOOD FRACTURE PATTERN DURING THE WATER DESORPTION PROCESS
Liyu Wang,Guangjie Zhao,Zhenyou Lu
MADERAS : Ciencia y Tecnología , 2006,
Abstract: Wood is a hygroscopic material and its mechanical properties change with moisture content below the fiber saturation point. Fracture characteristic is one of most important mechanical properties of wood and often is taken as an important safety design factor for wood as an engineered structural material. The aim of this paper is to investigate the effect of moisture content changes on wood fracture properties, focusing on fracture behavior and patterns with different crack orientations of Betula platyphylla Suk. and Pinus bungeana in two different desorption processes. These two desorption processes were, respectively, from fiber saturation point to an equilibrium moisture content corresponding to 82.4 %RH at 20°C and from 82.4 %RH to 35.2 %RH at the same temperature of 20 °C
Genome-wide gene expression profiling of introgressed indica rice alleles associated with seedling cold tolerance improvement in a japonica rice background
Zhang Fan,Huang Liyu,Wang Wensheng,Zhao Xiuqin
BMC Genomics , 2012, DOI: 10.1186/z
Abstract: Background Rice in tropical and sub-tropical areas is often subjected to cold stress at the seedling stage, resulting in poor growth and yield loss. Although japonica rice is generally more cold tolerant (CT) than indica rice, there are several favorable alleles for CT exist in indica that can be used to enhance CT in rice with a japonica background. Genome-wide gene expression profiling is an efficient way to decipher the molecular genetic mechanisms of CT enhancement and to provide valuable information for CT improvement in rice molecular breeding. In this study, the transcriptome of the CT introgression line (IL) K354 and its recurrent parent C418 under cold stress were comparatively analyzed to explore the possible CT enhancement mechanisms of K354. Results A total of 3184 differentially expressed genes (DEGs), including 195 transcription factors, were identified in both lines under cold stress. About half of these DEGs were commonly regulated and involved in major cold responsive pathways associated with OsDREB1 and OsMyb4 regulons. K354-specific cold-induced genes were functionally related to stimulus response, cellular cell wall organization, and microtubule-based movement processes that may contribute to increase CT. A set of genes encoding membrane fluidity and defensive proteins were highly enriched only in K354, suggesting that they contribute to the inherent CT of K354. Candidate gene prediction based on introgressed regions in K354 revealed genotype-dependent CT enhancement mechanisms, associated with Sir2, OsFAD7, OsWAK112d, and programmed cell death (PCD) related genes, present in CT IL K354 but absent in its recurrent parent C418. In K354, a number of DEGs were co-localized onto introgressed segments associated with CT QTLs, providing a basis for gene cloning and elucidation of molecular mechanisms responsible for CT in rice. Conclusions Genome-wide gene expression analysis revealed that genotype-specific cold induced genes and genes with higher basal expression in the CT genotype contribute jointly to CT improvement. The molecular genetic pathways of cold stress tolerance uncovered in this study, as well as the DEGs co-localized with CT-related QTLs, will serve as useful resources for further functional dissection of the molecular mechanisms of cold stress response in rice.
Clinical Efficacy of Crizotinib in Advanced ALK Positive ?Non-small Cell Lung Cancer
Jing ZHAO, Kun ZHANG, Liyu ZHANG, Hong WANG
- , 2015, DOI: : 10.3779/j.issn.1009-3419.2015.10.03
Abstract: Background and objective The aim of this study is to explore clinical efficacy of crizotinib in advanced anaplastic lymphoma kinase (ALK) positive non-small cell lung cancer. Methods Twenty-eight patients with advanced non-small cell lung cancer habouring ALK positive were randomly divided into crizotinib group (n=14) and chemotherapy group (n=14). Patients in the crizotinib group were receive oral treatment with crizotinib (250 mg) twice daily. Patients in the chemotherapy group were administrated docetaxel injection (75 mg/m2) every three weeks and every patient was treated at least 3 period. Then clinical efficacy was observed after 12 mo followed-up. Results Effective rate of patients in the crizotinib group was 64.29%. It was significantly higher than that of the chemotherapy group (21.43%)(P=0.026). The stable rate of patients in the crizotinib group was 85.71%. It was significantly higher than that of the chemotherapy group 40.86% (χ2=5.600, P=0.018). Median progression free survival (PFS) of the crizotinib group was 7.0 mo. It was longer than that of the chemotherapy group (4.0 mo)(P=0.002). Conclusion Crizotinib is superior to standard chemotherapy in patients with previously treated, advanced ALK positive non-small cell lung cancer. The median PFS of patients is shorter. It can improve the quality of life about patients.
Homological smoothness and deformations of generalized Weyl algebras
Liyu Liu
Mathematics , 2013,
Abstract: It is an immediate conclusion from Bavula's papers \cite{Bavula:GWA-def}, \cite{Bavula:GWA-tensor-product} that if a generalized Weyl algebra $A=\kk[z;\lambda,\eta,\varphi(z)]$ is homologically smooth, then the polynomial $\varphi(z)$ has no multiple roots. We prove in this paper that the converse is also true. Moreover, formal deformations of $A$ are studied when $\kk$ is of characteristic zero.
Treatment of oily sludge by ultrasonic extraction
超声萃取法处理含油污泥

Zhao Huan,Chen Yuanfei,Chen Liyu,
赵欢
,陈元飞,陈立宇

环境工程学报 , 2012,
Abstract: A technology for ultrasouic extraction process using gasoline as an extracting agent for oily sludge treatment was developed.The regulator,flocculant and emulsion breaker were selected and the process conditions such as extraction temperature,extraction time,ultrasound frequency and ultrasound power were determined.The result show that the 83.7% of oil in oily sludge was recovered under the following conditions: adding oil-field wastewater as a regulator,v(extracting agent)∶ v(regulator)∶ v(oily sludge)=4∶ 4∶ 1,extraction temperature of 40℃,extraction time of 15 min,ultrasonic frequency of 40 kHz and ultrasonic power of 150 W.
Tissue-Specific Transcriptomic Profiling of Sorghum propinquum using a Rice Genome Array
Ting Zhang, Xiuqin Zhao, Liyu Huang, Xiaoyue Liu, Ying Zong, Linghua Zhu, Daichang Yang, Binying Fu
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0060202
Abstract: Sorghum (Sorghum bicolor) is one of the world's most important cereal crops. S. propinquum is a perennial wild relative of S. bicolor with well-developed rhizomes. Functional genomics analysis of S. propinquum, especially with respect to molecular mechanisms related to rhizome growth and development, can contribute to the development of more sustainable grain, forage, and bioenergy cropping systems. In this study, we used a whole rice genome oligonucleotide microarray to obtain tissue-specific gene expression profiles of S. propinquum with special emphasis on rhizome development. A total of 548 tissue-enriched genes were detected, including 31 and 114 unique genes that were expressed predominantly in the rhizome tips (RT) and internodes (RI), respectively. Further GO analysis indicated that the functions of these tissue-enriched genes corresponded to their characteristic biological processes. A few distinct cis-elements, including ABA-responsive RY repeat CATGCA, sugar-repressive TTATCC, and GA-responsive TAACAA, were found to be prevalent in RT-enriched genes, implying an important role in rhizome growth and development. Comprehensive comparative analysis of these rhizome-enriched genes and rhizome-specific genes previously identified in Oryza longistaminata and S. propinquum indicated that phytohormones, including ABA, GA, and SA, are key regulators of gene expression during rhizome development. Co-localization of rhizome-enriched genes with rhizome-related QTLs in rice and sorghum generated functional candidates for future cloning of genes associated with rhizome growth and development.
Comparative Transcriptome Profiling of Chilling Stress Responsiveness in Two Contrasting Rice Genotypes
Ting Zhang, Xiuqin Zhao, Wensheng Wang, Yajiao Pan, Liyu Huang, Xiaoyue Liu, Ying Zong, Linghua Zhu, Daichang Yang, Binying Fu
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0043274
Abstract: Rice is sensitive to chilling stress, especially at the seedling stage. To elucidate the molecular genetic mechanisms of chilling tolerance in rice, comprehensive gene expressions of two rice genotypes (chilling-tolerant LTH and chilling-sensitive IR29) with contrasting responses to chilling stress were comparatively analyzed. Results revealed a differential constitutive gene expression prior to stress and distinct global transcription reprogramming between the two rice genotypes under time-series chilling stress and subsequent recovery conditions. A set of genes with higher basal expression were identified in chilling-tolerant LTH compared with chilling-sensitive IR29, indicating their possible role in intrinsic tolerance to chilling stress. Under chilling stress, the major effect on gene expression was up-regulation in the chilling- tolerant genotype and strong repression in chilling-sensitive genotype. Early responses to chilling stress in both genotypes featured commonly up-regulated genes related to transcription regulation and signal transduction, while functional categories for late phase chilling regulated genes were diverse with a wide range of functional adaptations to continuous stress. Following the cessation of chilling treatments, there was quick and efficient reversion of gene expression in the chilling-tolerant genotype, while the chilling-sensitive genotype displayed considerably slower recovering capacity at the transcriptional level. In addition, the detection of differentially-regulated TF genes and enriched cis-elements demonstrated that multiple regulatory pathways, including CBF and MYBS3 regulons, were involved in chilling stress tolerance. A number of the chilling-regulated genes identified in this study were co-localized onto previously fine-mapped cold-tolerance-related QTLs, providing candidates for gene cloning and elucidation of molecular mechanisms responsible for chilling tolerance in rice.
Functional Characterization of 14 Pht1 Family Genes in Yeast and Their Expressions in Response to Nutrient Starvation in Soybean
Lu Qin, Yongxiang Guo, Liyu Chen, Ruikang Liang, Mian Gu, Guohua Xu, Jing Zhao, Thomas Walk, Hong Liao
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0047726
Abstract: Background Phosphorus (P) is essential for plant growth and development. Phosphate (Pi) transporter genes in the Pht1 family play important roles in Pi uptake and translocation in plants. Although Pht1 family genes have been well studied in model plants, little is known about their functions in soybean, an important legume crop worldwide. Principal Findings We identified and isolated a complete set of 14 Pi transporter genes (GmPT1-14) in the soybean genome and categorized them into two subfamilies based on phylogenetic analysis. Then, an experiment to elucidate Pi transport activity of the GmPTs was carried out using a yeast mutant defective in high-affinity Pi transport. Results showed that 12 of the 14 GmPTs were able to complement Pi uptake of the yeast mutant with Km values ranging from 25.7 to 116.3 μM, demonstrating that most of the GmPTs are high-affinity Pi transporters. Further results from qRT-PCR showed that the expressions of the 14 GmPTs differed not only in response to P availability in different tissues, but also to other nutrient stresses, including N, K and Fe deficiency, suggesting that besides functioning in Pi uptake and translocation, GmPTs might be involved in synergistic regulation of mineral nutrient homeostasis in soybean. Conclusions The comprehensive analysis of Pi transporter function in yeast and expression responses to nutrition starvation of Pht1 family genes in soybean revealed their involvement in other nutrient homeostasis besides P, which could help to better understand the regulation network among ion homeostasis in plants.
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