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Search Results: 1 - 10 of 15814 matches for " SHEN Qiong "
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Carbon dioxide degassing flux from two geothermal fields in Tibet, China
LiCheng Shen,KunYu Wu,Qiong Xiao,DaoXian Yuan
Chinese Science Bulletin , 2011, DOI: 10.1007/s11434-011-4352-z
Abstract: Over geological time scales, Earth degassing has a significant impact on atmospheric carbon dioxide (CO2) concentrations, which are an important component of global carbon cycle models. In Tibet, structural conditions and associated widespread geothermal systems lead to carbon dioxide degassing during geothermal water migration. We characterized the hydrochemical conditions of two geothermal fields on the Tibetan Plateau. The chemical composition of geothermal waters was controlled by K-feldspar and albite. Geothermal waters in the Langjiu geothermal field were sodium chloride type and those of the Dagejia geothermal field were sodium bicarbonate type. Simulations of CO2 partial pressure within the two hydrogeothermal systems showed that CO2 degassing occurs during hot water migration from the aquifer to the surface. Carbon dioxide degassing flux from the Langjiu geothermal field was estimated to be ~3.6×106 kg km 2 a 1, and that from Dagejia was ~3.3×106 kg km 2 a 1.
Study on root development characteristics of spring maize and its relationships with canopy growth
春玉米根系生育特征与冠层关系的研究

HOU Qiong,SHEN Jianguo,
侯琼
,沈建国

生态学报 , 2001,
Abstract: The root development characteristics of spring maize and its relation to the canopy growth were analyzed based on field observed data.Equations were derived to quantify their relationships.The water effect on root growth was described in details.Methods to determine the irrigation wetting depth and to control the root to canopy ratio were developed according to rooting depth.This is quite helpful to the irrigation planning.
Designing Socially Intelligent Virtual Companions
Han Yu,Zhiqi Shen,Qiong Wu,Chunyan Miao
Computer Science , 2014,
Abstract: Virtual companions that interact with users in a socially complex environment require a wide range of social skills. Displaying curiosity is simultaneously a factor to improve a companion's believability and to unobtrusively affect the user's activities over time. Curiosity represents a drive to know new things. It is a major driving force for engaging learners in active learning. Existing research work pays little attention in curiosity. In this paper, we enrich the social skills of a virtual companion by infusing curiosity into its mental model. A curious companion residing in a Virtual Learning Environment (VLE) to stimulate user's curiosity is proposed. The curious companion model is developed based on multidisciplinary considerations. The effectiveness of the curious companion is demonstrated by a preliminary field study.
A Study on the Labor Cost of Chinese Listed Companies—Based on the Perspective of Labor Contract Law  [PDF]
Qiong Zhang
Modern Economy (ME) , 2016, DOI: 10.4236/me.2016.72018
Abstract: Given the background of enterprises facing with rising labor costs and shortage of human resources, we use a large sample of firms in China during 2004-2011 to test the sticky characteristic of labor cost. We also test the effect of labor protection on cost stickiness based on the implementation of Labor Contract Law. We find that the labor cost of listing firms in China is sticky, and the stickiness of state-owned enterprises is higher than that of non-state-owned enterprises. Furthermore, implementation of Labor Contract Law increased labor cost stickiness, both state-owned enterprises and non-state-owned enterprises.
China’s MOOC Research Hotspot Based on the Visual Co-Word Network Map: 1994-2018  [PDF]
Qiong Li
Open Journal of Social Sciences (JSS) , 2018, DOI: 10.4236/jss.2018.69010
Abstract: In this paper, based on CSSCI and SCI databases’ published papers during 1994-2018 from the data source, we use co-word analysis and social network analysis to build the China’s MOOC research visualization network map to describe the dynamic of the field, and suggest forecast for the future MOOC research. We found out that China’s MOOC research focusing on MOOC development countermeasure research, MOOC educational information, classroom teaching and MOOC hybrid teaching, MOOC and open education resources, MOOC application research of the library in colleges. The future research focuses on the study of the humanistic value of MOOC education and the research on the hybrid teaching mode of classroom teaching and online teaching.
High-Tech Enterprise Tax Planning  [PDF]
Qiong Zhang
American Journal of Industrial and Business Management (AJIBM) , 2019, DOI: 10.4236/ajibm.2019.91013
Abstract: Chinese economy is in transition with expanding domestic demand. The capacity is becoming a new economic normality. High-tech industry as a new force in promoting economic development plays an increasingly important role. Taxation is an important part of corporate financial management, the impact of the economic activity and tax interests of the company, so a reasonable tax planning is conducive to the company’s financial management objectives. Many high-tech industries enjoy preferential tax policies, while they are also high input and high output. So it is necessary for high-tech enterprises in tax planning. This paper introduces the theory of tax planning and high-tech industry, and then based on the latest legal summarizes the high-tech enterprises in the value-added tax, business tax, income tax of these three main tax incentives. Combining the features of tax planning concepts and high-tech industry, this paper presents the high-tech industry investment activities, operating activities, financing activities of the three aspects of tax planning strategies. Finally, the paper puts insufficient research from different angles such as policy risk and business risk. In the summary, I pointed out the lack of research presented in this paper and looked forward to the future tax planning.
Changes in intracellular Ca2+ cf sperm fore-and-aft acrosome reaction in the swimming crab Portunus trituberculatus
ZHU Dong-Fa,SHEN Li-Ping,SHEN Jian-Ming,WU Qiong
Acta Zoologica Sinica , 2008,
Abstract: The acrosome reaction process of sperm in the swimming crab Portunus trituberculatus ( Miers ) consists of four consecutive stages: (1) swelling of the apical cap; (2) eversion of the acrosomal vesicle; (3) forward elongation of the perforatorium and reversal of the acrosomal vesicle membrane; and (4) shedding of the acrosomal vesicle membrane and formation of the acrosomal filament. In the present study, Laser Scanning Confocal Microscope (LSCM) was used to image spermatozoa stained with Fluo-3 / AM at different stages of the fore-and-aft acrosome reaction. Fluo-3 / AM was used as the Ca2+ fluorescence indicator. The 488 nm argon laser was used for excitation and the emitted fluorescence was 526 nm. On account of the stability of sperm during the acrosome reaction, we selected sperm at three stages ( pre-acrosome reaction, the 3rd stage and the 4th stage of the acrosome reaction ) to analyze intracellular Ca2+ changes. The average fluorescence intensity of sperms in the above-chosen stages were 35.95±5.71, 66.80±7.35 and 3.87±2.82 respectively. Average fluorescence intensities among these stages exhibited significant differences ( P<0.01) . The intracellular calcium concentration ( [Ca2+]i ) of sperm shows a tendency to rise first and then decrease during the acrosome reaction. The [Ca2+]i of the sperm in the 3rd stage of the acrosome reaction increased significantly compared with that of the sperm before acrosome reaction. In the 4th stage of the acrosome reaction, with the acrosomal vesicle membrane shed and the acrosomal filament formed, the [Ca2+]i of the sperm decreased sharply. The primary distribution sites of the intracellular Ca2+ are the nucleus, perforatorium and cytoplasmic membrane remnants. The physiological actions of the intracellular Ca2+ changes of sperm during the fore-and-aft acrosome reaction in P. trituberculatus are also discussed [Acta Zoologica Sinica 54(5): 885–889, 2008].
β,β-Dimethylacrylshikonin Induces Mitochondria Dependent Apoptosis through ERK Pathway in Human Gastric Cancer SGC-7901 Cells
Xiu-Jin Shen, Hai-Bing Wang, Xiao-Qiong Ma, Jiang-Hua Chen
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0041773
Abstract: β,β-Dimethylacrylshikonin, one of the active components in the root extracts of Lithospermum erythrorhizon, posses antitumor activity. In this study, we discussed the molecular mechanisms of β,β-dimethylacrylshikonin in the apoptosis of SGC-7901 cells. β,β-Dimethylacrylshikonin reduced the cell viability of SGC-7901 cells in a dose- and time-dependent manner and induced cell apoptosis. β,β-Dimethylacrylshikonin treatment in SGC-7901 cells down-regulated the expression of XIAP, cIAP-2, and Bcl-2 and up-regulated the expression of Bak and Bax and caused the loss of mitochondrial membrane potential and release of cytochrome c. Additionally, β,β-dimethylacrylshikonin treatment led to activation of caspases-9, 8 and 3, and cleavage of poly (ADP-ribose) polymerase (PARP), which was abolished by pretreatment with the pan-caspase inhibitor Z-VAD-FMK. β,β-Dimethylacrylshikonin induced phosphorylation of extracellular signal-regulated kinase (ERK) in SGC-7901 cells. U0126, a specific MEK inhibitor, blocked the ERK activation by β,β-dimethylacrylshikonin and abrogated β,β-dimethylacrylshikonin -induced apoptosis. Our results demonstrated that β,β-dimethylacrylshikonin inhibited growth of gastric cancer SGC-7901 cells by inducing ERK signaling pathway, and provided a clue for preclinical and clinical evaluation of β,β-dimethylacrylshikonin for gastric cancer therapy.
Association of elevated transcript levels of interferon-inducible chemokines with disease activity and organ damage in systemic lupus erythematosus patients
Qiong Fu, Xiaoqing Chen, Huijuan Cui, Yanzhi Guo, Jing Chen, Nan Shen, Chunde Bao
Arthritis Research & Therapy , 2008, DOI: 10.1186/ar2510
Abstract: Peripheral blood cells obtained from 67 patients with SLE patients, 20 patients with rheumatoid arthritis (RA) and 23 healthy donors were subjected to real-time PCR in order to measure the transcriptional levels of seven interferon-inducible chemokines (RANTES, MCP-1, CCL19, MIG, IP-10, CXCL11, and IL-8). The data were used to calculate a chemokine score for each participant, after which comparisons were performed between various groups of SLE patients and control individuals.Chemokine scores were significantly elevated in SLE patients versus RA patients and healthy donors (P = 0.012 and P = 0.002, respectively). Chemokine scores were correlated positively with SLE Disease Activity Index 2000 scores (P = 0.005) and negatively with C3 levels (P < 0.001). Compared with patients without lupus nephritis and those with inactive lupus nephritis, chemokine scores were elevated in patients with active lupus nephritis, especially when their daily prednisone dosage was under 30 mg (P = 0.002 and P = 0.014, respectively). Elevated chemokine scores were also associated with the presence of cumulative organ damage (Systemic Lupus International Collaborating Clinics/American Society of Rheumatology Damage Index ≥ 1; P = 0.010) and the occurrence of anti-Sm or anti-RNP autoantibodies (both P = 0.021).The combined transcription level of interferon-inducible chemokines in peripheral blood leucocytes is closely associated with disease activity, degree of organ damage, and specific autoantibody patterns in SLE. The chemokine score may serve as a new biomarker for active and severe disease in SLE.Systemic lupus erythematosus (SLE) is a multi-system autoimmune disease characterized by immune dysregulation that results in the production of antinuclear and other autoantibodies, as well as immune complex deposition in the kidneys and other organs. The disease course of SLE is heterogeneous and characterized by unpredictable flares and remissions. Thus, there is a pressing need to identify
Seasonal variation of gut Cyanophyta contents and liver GST expression of mud carp (Cirrhina molitorella) and Nile tilapia (Oreochromis niloticus) in the tropical Xiangang Reservoir (Huizhou, China)
WeiXuan Cheng,XuFang Liang,Dan Shen,Qiong Zhou,Yan He,Shan He,GuangYu Li
Chinese Science Bulletin , 2012, DOI: 10.1007/s11434-011-4871-7
Abstract: Liver glutathione S-transferase (GST) plays a major role in the detoxification of microcystins (MCs) via conjugation to glutathione (GSH). We evaluated the relationship between seasonal variation in fish gut contents and the expression of GST isoforms in mud carp (Cirrhina molitorella) and Nile tilapia (Oreochromis niloticus). We quantified the abundance and diversity of plankton in the water column and foregut of mud carp and Nile tilapia in the tropical Xiangang Reservoir between October 2007 and July 2008. The mRNA expression of 7 liver GST isoforms was determined by real-time RT-PCR. The gut contents of both species were dependent on the amount and type of phytoplankton and zooplankton in the water. The expression of liver GST genes in Nile tilapia and mud carp was positively and negatively correlated, respectively, with the abundance of toxic cyanobacteria in the fore-gut. The expression of liver GST mRNA was correlated to the abundance of toxic cyanobacteria in the gut contents of both species, suggesting that mRNA expression of GST isoforms could be used as a biomarker in Nile tilapia and mud carp to monitor cyanobacteria blooms in reservoirs.
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