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Search Results: 1 - 10 of 78105 matches for " Chen Qingguo "
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Postharvest Low Temperature Conditioning Reduces Peel Browning and Improves Fruit Quality in Storage and Subsequent Shelf Life of Huangguan Pear  [PDF]
Qingmin Chen, Qingguo Wang, Maorun Fu
Food and Nutrition Sciences (FNS) , 2015, DOI: 10.4236/fns.2015.615141
Abstract: Huangguan pear (Pyrus bretschneideri Rehd cv. Huangguan) is a pear cultivar that rapidly developed in China. However, rapid postharvest browning appearing in fruit peel and core during storage and shelf life pose a challenge for their marketing. The potential for low temperature conditioning (LTC) treatment to inhibit peel browning and improve quality of Huangguan pears in storage and shelf life was investigated. Pears were treated at 8 - 9 for 1, 3, 6 and 9 d, respectively, physiological indexes, including peel and core browning, core breakdown, malondialdehyde (MDA) content and ethanol content were determined and quality in storage period and shelf life was evaluated in this paper. LTC treatment alleviated peel browning and core browning either in storage or shelf life remarkably; it also delayed the decline of firmness, total soluble solids and titratable acidity in storage to some extent, inhibited ethanol and MDA content both in storage and shelf life effectively and maintained juiciness and crispness of pear fruit in shelf life. These results showed that LTC can serve as an important tool for the regulation of Huangguan pears external and internal quality in storage and shelf life with economic benefits and LTC treatment for 6 d was the optimum condition in the present study.
Circumbinary disk, an efficient medium extracting orbital angular momentum in close binaries
WenCong Chen,QingGuo Zeng
Chinese Science Bulletin , 2009, DOI: 10.1007/s11434-009-0034-5
Abstract: The loss of orbital angular momentum plays an important role in the mass transfer and orbital evolution of close binaries. The traditional mechanisms of orbital angular momentum loss consist of gravitational wave radiation, mass loss and magnetic braking. However, a small fraction of the mass outflow may form a thin circumbinary disk (CB disk) located in the orbital plane of the binary during mass exchange. The tide torques caused by the gravitational interaction between a CB disk and a binary system brake binary effectively, and extract the orbital angular momentum from the binary system. In this study, numerical calculations for the evolution of the white dwarf binary show that a CB disk is an efficient medium extracting orbital angular momentum even if the mass loss is very small. Finally, some theoretical research and observational progress on CB disks are presented.
Circumbinary disk, an efficient medium extracting orbital angular momentum in close binaries

WenCong Chen,QingGuo Zeng,

科学通报(英文版) , 2009,
Abstract: The loss of orbital angular momentum plays an important role in the mass transfer and orbital evolution of close binaries. The traditional mechanisms of orbital angular momentum loss consist of gravitational wave radiation, mass loss and magnetic braking. However, a small fraction of the mass outflow may form a thin circumbinary disk (CB disk) located in the orbital plane of the binary during mass exchange. The tide torques caused by the gravitational interaction between a CB disk and a binary system brake binary effectively, and extract the orbital angular momentum from the binary system. In this study, numerical calculations for the evolution of the white dwarf binary show that a CB disk is an efficient medium extracting orbital angular momentum even if the mass loss is very small. Finally, some theoretical research and observational progress on CB disks are presented. Supported by the National Natural Science Foundation of China (Grant Nos. 10873011, 10573009, 10573010) and Program for Science & Technology Innovation Talents in Universities of Henan Province, China
Application of Carbon Dioxide and Polyacrylamide in Extracting Magnesium from Brine by Precipitation Method  [PDF]
Haiyan Hu, Lin Zhou, Qingguo Chen
Journal of Geoscience and Environment Protection (GEP) , 2016, DOI: 10.4236/gep.2016.47022
Abstract:
In this paper, carbon dioxide and polyacrylamide were used to improve the method to abstract magnesium from desalination brine. Experimental results showed that calcium ion in the desali-nation brine can be effectively removed using carbon dioxide, which thereby improves the purity and reaction efficiency of the magnesium hydrate precipitate. 0.1% - 0.2% PAM could help to promote the precipitation of magnesium hydrate colloid. And when hydroxyl anion was between 110% - 130% of theoretical amount, yield of magnesium hydrate exceeds 70% at standing time of 60 hours.
Enhancement of Tendon–Bone Healing for Anterior Cruciate Ligament (ACL) Reconstruction Using Bone Marrow-Derived Mesenchymal Stem Cells Infected with BMP-2
Yu Dong,Qingguo Zhang,Yunxia Li,Jia Jiang,Shiyi Chen
International Journal of Molecular Sciences , 2012, DOI: 10.3390/ijms131013605
Abstract: At present, due to the growing attention focused on the issue of tendon–bone healing, we carried out an animal study of the use of genetic intervention combined with cell transplantation for the promotion of this process. Here, the efficacy of bone marrow stromal cells infected with bone morphogenetic protein-2 (BMP-2) on tendon–bone healing was determined. A eukaryotic expression vector containing the BMP-2 gene was constructed and bone marrow-derived mesenchymal stem cells (bMSCs) were infected with a lentivirus. Next, we examined the viability of the infected cells and the mRNA and protein levels of BMP-2-infected bMSCs. Gastrocnemius tendons, gastrocnemius tendons wrapped by bMSCs infected with the control virus (bMSCs+Lv-Control), and gastrocnemius tendons wrapped by bMSCs infected with the recombinant BMP-2 virus (bMSCs+Lv-BMP-2) were used to reconstruct the anterior cruciate ligament (ACL) in New Zealand white rabbits. Specimens from each group were harvested four and eight weeks postoperatively and evaluated using biomechanical and histological methods. The bMSCs were infected with the lentivirus at an efficiency close to 100%. The BMP-2 mRNA and protein levels in bMSCs were significantly increased after lentiviral infection. The bMSCs and BMP-2-infected bMSCs on the gastrocnemius tendon improved the biomechanical properties of the graft in the bone tunnel; specifically, bMSCs infected with BMP-2 had a positive effect on tendon–bone healing. In the four-week and eight-week groups, bMSCs+Lv-BMP-2 group exhibited significantly higher maximum loads of 29.3 ± 7.4 N and 45.5 ± 11.9 N, respectively, compared with the control group (19.9 ± 6.4 N and 21.9 ± 4.9 N) ( P = 0.041 and P = 0.001, respectively). In the eight-week groups, the stiffness of the bMSCs+Lv-BMP-2 group (32.5 ± 7.3) was significantly higher than that of the bMSCs+Lv-Control group (22.8 ± 7.4) or control groups (12.4 ± 6.0) ( p = 0.036 and 0.001, respectively). Based on the histological findings, there was an increased amount of perpendicular collagen fibers formed between the tendon and bone in the bMSCs+Lv-Control and bMSCs+Lv-BMP-2 group, compared with the gastrocnemius tendons. The proliferation of cartilage-like cells and the formation of fibrocartilage-like tissue were highest within the bone tunnels in the bMSCs+Lv-BMP-2 group. These results suggest that this lentivirus can be used to efficiently infect bMSCs with BMP-2. Furthermore, tendons wrapped by bMSCs+Lv-BMP-2 improved tendon–bone healing.
Clinicopathological and prognostic significance of HER-2/neu and VEGF expression in colon carcinomas
Qingguo Li, Daorong Wang, Jing Li, Ping Chen
BMC Cancer , 2011, DOI: 10.1186/1471-2407-11-277
Abstract: HER-2/neu and VEGF were investigated immunohistochemically using tumor samples obtained from 317 colon cancer patients with all tumor stages. Correlation of the degree of staining with clinicopathological parameters and survival was investigated.Positive expression rates of HER-2/neu and VEGF in colon cancer were 15.5% and 55.5% respectively. HER-2/neu expression was significantly correlated with tumor size and distant metastases (P < 0.05), but was not an independent prognostic marker of survival (P > 0.05). Expression of VEGF was significantly correlated with tumor size, tumor stage, lymph node metastases, and distant metastases (P < 0.05). The 5-year survival rate in patients with negative and positive VEGF expression was 70.2% and 61.9% respectively; the difference was not statistically significant (P = 0.146). No correlation between HER-2/neu and VEGF expression was detected (P = 0.151).HER-2/neu and VEGF are not important prognostic markers of colon cancer. The present results do not support any association between HER2/neu and VEGF expression in this setting.Colorectal cancer (CRC) is one of the most common malignancies worldwide and is the fourth leading cause of cancer-related death in China. Although the development of new cytotoxic agents such as oxaliplatin and irinotecan and new surgical techniques has improved prognosis of CRC, once patients develop resistance to chemotherapeutic regimens no other treatment options are available. Recently, therapeutic strategies have been improved by the development and availability of monoclonal antibodies. Investigators have recently been evaluating biologic and molecular targets for their possible roles as prognostic markers and as targets for therapy.The HER-2/neu oncogene, also known as c-erbB-2, encodes a transmembrane tyrosine kinase receptor, homologous to epidermal growth factor receptor (EGFR), This receptor is involved in the growth and progression of malignant cells. For instance, overexpression of the HER-
The 3rd-order nonlinearity of bacteriorhodopsin by four-wave mixing
Yanping Huang,Liying Wang,Shudi Chen,Zugeng Wang,Qingguo Li
Chinese Science Bulletin , 2000, DOI: 10.1007/BF02886259
Abstract: The 3rd-order nonlinear optical susceptibility X(3) and the response time of the light-transducing biomolecule bacteriorhodopsin were measured with the four-wave mixing technique and a picosecond frequency-doubled Nd: YAG laser (532 nm). TheX 3) and the response time measured are 10-9 esu and 20 ps, respectively. The possible mechanism for generating the 3rd-order nonlinear optical susceptibility X(3) and response time were discussed.
Study on the Case Teaching Method and the Sustainable Development Education for the Inner Mongol Colleges
Qingguo Meng
Journal of Sustainable Development , 2009, DOI: 10.5539/jsd.v2n1p65
Abstract: Based on the case, this article expatiated on the criticalness, the transformation and the practicalness of the sustainable development education. Through the development research of the Inner Mongol cases, we pointed out the case method of teaching was a sort of teaching mode with significant efficiency to realize the multiple objects of the sustainable development education for the Inner Mongol colleges, put forward the objective system and the tenet of the sustainable development education which was the remodeling of the emotion and the value view to promote the establishment of the core idea of the sustainable development education.
Green's functions and equations of motion in correlated many body systems
Qingguo Feng
Physics , 2013,
Abstract: In this paper some new physical notations are given for the Green's functions and equations of motion (EOM) in many body physics with the concept of quasiparticles. It shows how the many body correlations existing in many body systems can be taken into account through the derivation of EOMs self-consistently. The scheme is compared with the expansion of Feynman diagrams. Finally some further discussions are given for the unique properties of EOM techniques in helping to model a system and the interactions self-consistently.
A Script Language for Data Integration in Database
Qingguo Zheng
Computer Science , 2003,
Abstract: A Script Language in this paper is designed to transform the original data into the target data by the computing formula. The Script Language can be translated into the corresponding SQL Language, and the computation is finally implemented by the first type of dynamic SQL. The Script Language has the operations of insert, update, delete, union, intersect, and minus for the table in the database.The Script Language is edited by a text file and you can easily modify the computing formula in the text file to deal with the situations when the computing formula have been changed. So you only need modify the text of the script language, but needn't change the programs that have complied.
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