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Search Results: 1 - 10 of 105696 matches for " Ao Zhang "
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Regulation of Reversible Dissociation of LHCII from PSII by Phosphorylation in Plants  [PDF]
Zhenhai Cui, Yanpeng Wang, Ao Zhang, Lijun Zhang
American Journal of Plant Sciences (AJPS) , 2014, DOI: 10.4236/ajps.2014.52032

LHCII is a crucial light-harvesting pigment/protein complex in photosystem II (PSII) supercomplex. It also participates in the light energy redistribution between photosystems and in the photoprotection via its reversible dissociation with PSII and PSI (photosystem I). This reversible detachment of LHCII is regulated by phosphorylation of its own and PSII core protein. Under low light conditions, LHCII is phosphorylated and dissociated with PSII core protein complex and combined with PSI, which balances the excitation energy between PSII and PSI; Under high light environment, the phosphorylation of PSII core proteins makes LHCII detach from PS

Discussion on the mechanism of the calcium absorption in the human body
Jingkun Zhang,Zemin Zhang,Ao Yu
Chinese Science Bulletin , 2001, DOI: 10.1007/BF03183399
Abstract: The present article discusses a new mechanism of calcium absorption in the human body. The mechanism is revealed as follows. First, after food is digested in the stomach, calcium ions (Ca2+) are released. The small intestine secretes amino acid or short peptide chain with small molecular weight automatically, which are called chelating agent; when the calcium ions from the stomach get to the small intestine, the reaction of the chelating agent with the calcium ions occurs, producing the neutral amino acid calcium chelate. Then, this kind of calcium chelate with small molecular weight is absorbed as a whole into the tissues of the small intestine. After being absorbed, in the cell the calcium chelate can break down its chelating bond automatically and decompose into the amino acid and calcium ion again. Finally, the calcium ion goes into blood through portal vein and is transferred to the organs and also deposits on the bone. The reason for the body’s calcium insufficiency, which has no linear relation with the calcium intake amount, is the lack of the amino acid secreted by the small intestine. The main barrier that influences the calcium absorption is anion pollution. The calcium absorptivity of the body has nothing to do with the solubility of the calcium source out of the body. A new kind of calcium supplement agent—glycine calcium chelate—is synthesized, whose molecular weight is 206.06 (containing a molecular water). If the glycine calcium chelate is used to make calcium supplement agent, about 20 mg calcium element (converted from the glycine calcium chelate, the same below, no longer indicated) per day for one person, 50 mg at most, is enough to maintain the positive balance of calcium metabolism.
Synthesis and Performance Evaluation of Organic Bentonite Modifier Dimethyldistearylammonium Bromide (DODMAB)  [PDF]
Qingwang Liu, Ao Sun, Zhenzhong Fan, Jiguang Wang, Tong Zhang, Dong Cheng
Open Journal of Composite Materials (OJCM) , 2014, DOI: 10.4236/ojcm.2014.44024
Abstract: Dimethyldistearylammonium Bromide (DODMAB) is a bentonite modifier with good performance. In this experiment, 1-Bromooctadecane is the raw material, and completes tertiary amination and quaternization successively by changing the condition of experiment. The result is that the productivity can achieve 78.94% in the synthesis of DODMAB. It has been used in the experiment of bentonite modification and achieves good results; compared with using trimethylstearylammonium bromide as the organic modifier, the synthetic organic bentonite has better performance than the common organic modifier when used in the oil base drilling fluid of oilfield operation.
The Synthesis and Evaluation of a Novel Inhibitor DN for Carbon Dioxide Corrosion  [PDF]
Qingwang Liu, Tong Zhang, Jigang Wang, Zhenzhong Fan, Ao Sun, Dong Cheng
Open Journal of Composite Materials (OJCM) , 2014, DOI: 10.4236/ojcm.2014.44023
Abstract: During the oil and gas wells exploitation and transportation, carbon dioxide corrosion is one of main reasons for the corrosion of metallic materials. So the methods of preventing and reducing carbon dioxide corrosion have become a widely focused problem. The foreign and domestic practices and experiences show that as an economic, effective and versatile metal corrosion control method, corrosion inhibitor protection technology is suitable for application in oil and gas transportation system. This paper, through the indoor experiment with benzyl chloride, using quinoline as raw materials, synthesizes a kind of quinoline quaternary ammonium salt. The obtained product benzyl chloride quinoline compounded with OP-10 and ethanol to get a novel inhibitor DN for carbon dioxide corrosion, and to evaluate its performance.
The Synthesis and Evaluation of Hydrophobic Association Thickener  [PDF]
Qingwang Liu, Dong Cheng, Jigang Wang, Zhenzhong Fan, Tong Zhang, Ao Sun
Open Journal of Composite Materials (OJCM) , 2015, DOI: 10.4236/ojcm.2015.51001
Abstract: The paper provides a new hydrophobic association polymer fracturing fluid gelatinizer. The hydrophobic association which is the synthesis of three component copolymer complexes, is compounded by micellar copolymerization method. The hydrophobic association is got together through hydrophilic monomer acrylamide monomer N,N-vinyl pyrrolidone monomer with a rigid group N, and hydrophobic monomer N,N-2 dodecyl acrylamide etc. three monomers with sodium dodecyl sulfate as the emulsifier in micellar solution.
Finding distinct biclusters from background in gene expression matrices
Zhengpeng Wu,Jiangni Ao,Xuegong Zhang
Bioinformation , 2007,
Abstract: Biclustering, or the discovery of subsets of samples and genes that are homogeneous and distinct from the background, has become an important technique in analyzing current microarray datasets. Most existing biclustering methods define a bicluster type as a fixed (predefined) pattern and then trying to get results in some searching process. In this work, we propose a novel method for finding biclusters or 2-dimensional patterns that are significantly distinct from the background without the need for pre-defining a pattern within the bicluster. The method named Distinct 2-Dimensional Pattern Finder (D2D) is composed of an iterative reordering step of the rows and columns in the matrix using a new similarity measure, and a flexible scanning-and-growing step to identify the biclusters. Experiments on a large variety of simulation data show that the method works consistently well under different conditions, whereas the existing methods compared may work well under some certain conditions but fail under some other conditions. The impact of noise levels, overlapping degrees between clusters and different setting of parameters were also investigated, which indicated that the D2D method is robust against these factors. The proposed D2D method can efficiently discover many different types of biclusters given that they have distinctive features from the background. The computer program is available upon request.
The Impact of Cross-Cultural Communication on Foreign Managers’ Leadership Style in China-Based International Organization  [PDF]
Ying Ao
Open Journal of Social Sciences (JSS) , 2016, DOI: 10.4236/jss.2016.49010
Abstract: In order to make a clear identification about which leadership style can be appropriate and effective for foreign leaders in China, a specific focus has put on the Chinese natives’ cultural values and its influence on foreign manager’s leadership styles. Six foreign leaders from two China-based international organizations in Chengdu and Shen-zhen were interviewed on several issues, including decision-making, conflict management and work distribution. A qualitative analysis has been conducted through theme categorization which responds that transformational leadership style can be effective and appropriate for foreign leaders to strengthen their relationship with Chinese employees.
On Practice of the Effect of Systematic Family Nursing Guidance on the Quality of Life of Elderly Patients with Implanted Cardiac Pacemaker  [PDF]
Xin Ao
Yangtze Medicine (YM) , 2018, DOI: 10.4236/ym.2018.23018
Abstract: Objective: To inquire into the effect of systematic family nursing guidance on improving the Quality of Life for elderly patients with implanted cardiac pacemaker. Methods: 41 elderly patients in accordance with the corresponding requirements were studied after offering systematic family nursing guidance and surveyed through the questionnaires about the QOL (quality of life) respectively 1 month, 3 months and 6 months after leaving hospital. Results: Compared with that of 1 month and 3 months after the operation, the questionnaire scores for 6 months after the operation were found to have significant improvement, and the differences were statistically significant. Conclusion: Systematic family nursing guidance can effectively improve the QOL for elderly patients with implanted cardiac pacemaker, which makes them spend their old age in comfort and happiness.
Different Effects of Malate on the Activities of Photosystem II in Detached Leaves of Maize and Tobacco  [PDF]
Zhenhai Cui, Ao Zhang, Ziling Hu, Lijun Zhang, Jinjuan Fan, Yanshu Zhu, Kai Hu, Yanye Ruan, Yixin Guan
American Journal of Plant Sciences (AJPS) , 2015, DOI: 10.4236/ajps.2015.611173
Abstract: Malate is the first stable product after CO2 is fixed in NADP-dependent malic enzyme (NADP-ME) type of C4 plants, which transfers CO2 and the reducing equivalent from mesophyll cell (MC) to vascular bundle sheath cell (BSC) chloroplasts and affects the redox state of BSC. The aim of this experiment is to investigate the effect of exogenous malate on the activity of photosystem II (PS II) in C4 and C3 plants. The leaf discs from the 5th fully expanded leaves of maize (NADP-ME type C4 plants) and the 10th fully expanded leaves of tobacco (C3 plants) were treated with malate of 50, 100 μM and the chlorophyll fluorescence parameters were measured. Malate treatments decreased the photochemical reaction efficiency (FV/FM) in maize leaves, as a result of rising in initial fluorescence (FO) and decreasing in maximal fluorescence (FM). The number of active PS II reaction center (RC) per excited cross section (RC/CS) declined in malate-treated maize, suggesting that malate inactivated PS II RC. Malate treatments also increased Wk, representing the severity of oxygen-evolving complex (OEC) damage, and decreased the rate of photosynthetic oxygen evolution. We conclude that exogenous malate regulates the activity and structure of PS II in C4 plant maize. No significant changes in the activity of PS II were observed in malate-treated C3 plant tobacco. It is suggested that the short term malate treatment will inhibit PS II of leaves which have C4 anatomy and C4 enzymes.
A Novel Dual-Loop Coupler for One-Port Cylindrical Cavity Permittivity Measurement
Hai Zhang;Bao-Qing Zeng;Lei Ao;Zhaotang Zhang
PIER , 2012, DOI: 10.2528/PIER12032613
Abstract: The one-port cavity resonator method based on the parameter measurement technique for measuring the complex permittivity of dielectric samples has been proposed. A novel dual-loop coupler is developed for avoiding and suppressing the spurious modes in one-port cavity resonator. Through threading the pair of half loop in the opposite direction, the opposite surface currents can be generated and only TE mode will be excited. The operating principles of the dual-loop coupler are investigated. This technique has the advantages of the coupling. Equivalent electronic circuit model has been set up. Simulation and experimental results show good agreement.
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