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Search Results: 1 - 10 of 78241 matches for " CHEN Muqing "
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The Comparisonal Analysis of the Concept of Rectangular and Hexagonal Pilot in OFDM  [PDF]
Jeanbaptiste YAMINDI, Muqing WU
Communications and Network (CN) , 2009, DOI: 10.4236/cn.2009.11001
Abstract: Channel estimation in coherent OFDM by inserting pilot-symbols into two-dimensional time- frequency lattice is a promising candidate for improving channel transmission capacity in future wireless communication systems. This paper proposes a new Cartesian mathematical concept of the Hexagonal Pilot Pattern, Hexagonal Pilot with Virtual and Rectangular Pilot Pattern. The main focus of this work is to compare between the two pilots and by virtue of simulation conclusion which of the two pilots yields a better performance.
Applied an Efficient Site-directed Mutagenesis Method into Escherichia coli
Muqing Qiu
International Journal of Information Technology and Computer Science , 2011,
Abstract: A new technique for conducting site-directed mutagenesis was developed. This method allows the color selection of mutants through the simultaneous activation or deactivation of the α-peptide of -galactosidase. The method can efficiently create mutations at multiple sites simultaneously and can be used to perform multiple rounds of mutation on the same construct. In this paper, in order to develop an efficient site-directed mutagenesis method in vivo, the tests were tested by the following methods. The methods that the fragment knock-out ompR gene was constructed through overlapping PCR, digested by Notand SalⅠⅠ, ligated to plasmid pKOV were applied. The recombination plasmid was transformed into Escherichia coli WMC-001 strain, integrated into the genomic DNA through two step homologous recombination. The Escherichia coli WMC-001/ompR- mutant was obtained due to gene replacement. The fragment of the mutant ompR gene was amplified through overlapping PCR, cloned into pKOV vector. The recombinant plasmid was introduced into Escherichia coli WMC-001/ompR- mutant. The Escherichia coli WMC-001/ompR mutant was also obtained due to gene replacement. Results: The site-directed mutagenesis has been successfully constructed in the ompR gene by sequencing. Conclusion: The method is effective for construction of gene site-directed mutagenesis in vivo.
Differential Protein Expression in Sugarcane during Sugarcane-Sporisorium scitamineum Interaction Revealed by 2-DE and MALDI-TOF-TOF/MS
Youxiong Que,Liping Xu,Jianwei Lin,Miaohong Ruan,Muqing Zhang,Rukai Chen
Comparative and Functional Genomics , 2011, DOI: 10.1155/2011/989016
Abstract: To understand the molecular basis of a specific plant-pathogen interaction, it is important to identify plant proteins that respond to the pathogen attack. Two sugarcane varieties, NCo376 and Ya71-374, were used in this study. By applying 2-dimensional electrophoresis (2-DE), the protein expression profile of sugarcane after inoculating with Sporisorium scitamineum was analyzed. In total, 23 differentially expressed proteins were identified by MALDI-TOF-TOF/MS. Bioinformatics analysis revealed that the functions of these 20 differential proteins were associated with such functions as photosynthesis, signal transduction, and disease resistance, while the function of the remaining three proteins was not determined. From above, we can assume that the protein regulatory network during the interaction between sugarcane and S. scitamineum is complicated. This represents the first proteomic investigation focused on highlighting the alterations of the protein expression profile in sugarcane exposed to S. scitamineum, and it provides reference information on sugarcane response to S. scitamineum stress at the protein level.
THE ANALYSIS OF THE FLORA IN MT.DALI, ANHUI AND THE RARE AND NEARLY EXTERMINATING PROTECTED PLANTS
大历山植物区系分析及珍稀濒危保护植物

Jiang Muqing,Chen Renjun,Qian Shixin,
.蒋木青
,.陈仁钧,.钱士心

植物科学学报 , 1990,
Abstract: There are 1151 species (including varieties cultivar) of vascular plants in Mt. Dali, which belong to 579 genera and 154 families. Among these 103 species, 56 genera and 8 families represent the pteridophytes; 8 species, 6 genera and 5 families comprise the gymnosperms; 1040 species, 517 genera and 121 families are the Angiosperms. This paper mainly analyse the flora features and rare and nearly exterminating protected plants in Mt. Dali.
Differential Protein Expression in Sugarcane during Sugarcane-Sporisorium scitamineum Interaction Revealed by 2-DE and MALDI-TOF-TOF/MS
Youxiong Que,Liping Xu,Jianwei Lin,Miaohong Ruan,Muqing Zhang,Rukai Chen
International Journal of Genomics , 2011, DOI: 10.1155/2011/989016
Abstract: To understand the molecular basis of a specific plant-pathogen interaction, it is important to identify plant proteins that respond to the pathogen attack. Two sugarcane varieties, NCo376 and Ya71-374, were used in this study. By applying 2-dimensional electrophoresis (2-DE), the protein expression profile of sugarcane after inoculating with Sporisorium scitamineum was analyzed. In total, 23 differentially expressed proteins were identified by MALDI-TOF-TOF/MS. Bioinformatics analysis revealed that the functions of these 20 differential proteins were associated with such functions as photosynthesis, signal transduction, and disease resistance, while the function of the remaining three proteins was not determined. From above, we can assume that the protein regulatory network during the interaction between sugarcane and S. scitamineum is complicated. This represents the first proteomic investigation focused on highlighting the alterations of the protein expression profile in sugarcane exposed to S. scitamineum, and it provides reference information on sugarcane response to S. scitamineum stress at the protein level. 1. Introduction Sugarcane smut, which causes significant losses in cane and sugar yield as well as lowering sucrose content, is a fungal disease caused by Sporisorium scitamineum. Following infection, sugarcane plants often tiller profusely with the shoots being more spindly and the leaves being more upright and narrow (“grass-like” in appearance) and “buggy-like” whips emerging from the shoots. Less common symptoms are leaf and stem galls and proliferating buds. The development of sugarcane smut depends on environment, cultivar, and pathogen interactions. Plant disease resistance is complex, involving a complex network of recognition of avirulence determinants by plant receptors, triggering of specific signal transduction pathways, oxidative bursts, accumulation of pathogenesis-related (PR-) proteins and phytoalexins, and localized cell death [1]. Understanding the basis of pathogens causing a certain disease in one host plant but not in another has long intrigued and motivated plant pathologists. Until recently, increasing attention has been paid to the study of the interaction between sugarcane and S. scitamineum. The research reports have mainly concentrated on the physiological and biochemical changes during interaction between sugarcane and S. scitamineum, which should be helpful in accelerating the formulation of short- and long-term strategies of smut disease management [2–4]. Additionally, the study of sugarcane-S. scitamineum
Stomata Prioritize Their Responses to Multiple Biotic and Abiotic Signal Inputs
Xiaobin Ou, Yi Gan, Peilei Chen, Muqing Qiu, Kun Jiang, Genxuan Wang
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0101587
Abstract: Stomata are microscopic pores in leaf epidermis that regulate gas exchange between plants and the environment. Being natural openings on the leaf surface, stomata also serve as ports for the invasion of foliar pathogenic bacteria. Each stomatal pore is enclosed by a pair of guard cells that are able to sense a wide spectrum of biotic and abiotic stresses and respond by precisely adjusting the pore width. However, it is not clear whether stomatal responses to simultaneously imposed biotic and abiotic signals are mutually dependent on each other. Here we show that a genetically engineered Escherichia coli strain DH5α could trigger stomatal closure in Vicia faba, an innate immune response that might depend on NADPH oxidase-mediated ROS burst. DH5α-induced stomatal closure could be abolished or disguised under certain environmental conditions like low [CO2], darkness, and drought, etc. Foliar spraying of high concentrations of ABA could reduce stomatal aperture in high humidity-treated faba bean plants. Consistently, the aggressive multiplication of DH5α bacteria in Vicia faba leaves under high humidity could be alleviated by exogenous application of ABA. Our data suggest that a successful colonization of bacteria on the leaf surface is correlated with stomatal aperture regulation by a specific set of environmental factors.
Characterization of Pure Ductal Carcinoma In Situ on Dynamic Contrast-Enhanced MR Imaging: Do Nonhigh Grade and High Grade Show Different Imaging Features?
Siwa Chan,Jeon-Hor Chen,Garima Agrawal,Muqing Lin,Rita S. Mehta,Philip M. Carpenter,Orhan Nalcioglu,Min-Ying Su
Journal of Oncology , 2010, DOI: 10.1155/2010/431341
Abstract: To characterize imaging features of pure DCIS on dynamic contrast-enhanced MR imaging (DCE-MRI), 31 consecutive patients (37-81 years old, mean 56), including 2 Grade I, 16 Grade II, and 13 Grade III, were studied. MR images were reviewed retrospectively and the morphological appearances and kinetic features of breast lesions were categorized according to the ACR BI-RADS breast MRI lexicon. DCE-MRI was a sensitive imaging modality in detecting pure DCIS. MR imaging showed enhancing lesions in 29/31 (94%) cases. Pure DCIS appeared as mass type or non-mass lesions on MRI with nearly equal frequency. The 29 MR detected lesions include 15 mass lesions (52%), and 14 lesions showing non-mass-like lesions (48%). For the mass lesions, the most frequent presentations were irregular shape (50%), irregular margin (50%) and heterogeneous enhancement (67%). For the non-mass-like lesions, the clumped internal enhancement pattern was the dominate feature, seen in 9/14 cases (64%). Regarding enhancement kinetic curve, 21/29 (78%) lesions showed suspicious malignant type kinetics. No significant difference was found in morphology ( ), tumor size (P = 0.21), and kinetic characteristics ( ) between non-high grade (I+II) and high-grade (III) pure DCIS. 1. Introduction Ductal Carcinoma In Situ (DCIS) is characterized by proliferation of malignant cells confined by the basement membranes of ductal structures, without evidence of extraductal invasion [1]. DCIS comprises different subtypes with heterogeneous proliferative disease processes and varies in architecture, imaging features, and clinical outcome. Although the progression of DCIS is not fully understood, it is known that untreated DCIS is likely to progress to invasive cancer within 10 years of diagnosis. Therefore, DCIS is considered a preinvasive form of invasive breast cancer that requires immediate treatment [2, 3]. With the widespread use of screening mammography, DCIS now accounts for 15%–20% of all newly detected breast cancer, with the trend still increasing [4]. In mammography, DCIS most frequently presents as microcalcifications, accounting for about 85%–90% of diagnosed cases. An accurate preoperative staging is very important for treatment planning of DCIS. Although mammography has been the mainstay for diagnosis of DCIS, it has limitations in defining the extension and the margin, especially in patients without microcalcifications or in those with dense breasts or breast implants. Furthermore, there is a tendency to underestimate the tumor size of DCIS on mammography [5–7]. Positive surgical margin is
Fair Scheduling for the Optimal Link of Ad hoc Network Based on Graph Theory
Chaoyi Zhang,Jingfang Su,Jiansong Miao,Muqing Wu
Information Technology Journal , 2011,
Abstract: Using a wireless multi-hop networks multi-link transmission to improve the system throughput, consider the priorities and fairness of the link scheduling optimization model and propose a fair scheduling for the optimal link, then design a link optimal fair scheduling algorithm based on graph theory. The mathematical model is based on links conflict, use node back- off time multi bandwidth to maximize the objective function, by solving the optimal solution of the model get the largest set of solution space, that is the best link scheduling strategy. Then according to the strategy with graph theory, designed a fair scheduling algorithm for the wireless multi-hop network link. The simulation proved that the algorithm is the link in ensuring fairness, at the same time, compared to existing algorithms it can get more than 10% system capacity gain.
含Ti系微合金热轧搪瓷钢连续冷却转变曲线及其组织研究
A study on the continuous cooling transition curve of Ti-bearing microalloyed hot-rolled enamel steel and corresponding microstructures

陶军晖,吴 田,戴 伟,李 杰,陈木青,汪川惠,陈欣琦,李 睿,靳海芹,祁红艳
TAO Junhui
,WU Tian,DAI Wei,LI Jie,CHEN Muqing,WANG Chuanhui,CHEN Xinqi,LI Rui,JIN Haiqin,QI Hongyan

- , 2018,
Abstract: 采用热膨胀法和金相法,在Formastor-F试验机上测定了含Ti系微合金热轧搪瓷钢RT360的Ac1和Ac3以及Ms,并测定了该钢在不同冷却速度下连续冷却时的膨胀曲线,获得了该钢的连续冷却转变曲线(CCT曲线)及其相应组织,测定结果为大生产热处理工艺的制定提供了理论基础.当轧后冷却速率<0.5 ℃/s,可获得理想的多边形铁素体+少量珠光体组织.淬硬性倾向较小,基本不会出现冷裂纹.
Deciphering the Bacterial Microbiome of Citrus Plants in Response to ‘Candidatus Liberibacter asiaticus’-Infection and Antibiotic Treatments
Muqing Zhang, Charles A. Powell, Lesley S. Benyon, Hui Zhou, Yongping Duan
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0076331
Abstract: The bacterial microbiomes of citrus plants were characterized in response to ‘Candidatus Liberibacter asiaticus’ (Las)-infection and treatments with ampicillin (Amp) and gentamicin (Gm) by Phylochip-based metagenomics. The results revealed that 7,407 of over 50,000 known Operational Taxonomic Units (OTUs) in 53 phyla were detected in citrus leaf midribs using the PhyloChip? G3 array, of which five phyla were dominant, Proteobacteria (38.7%), Firmicutes (29.0%), Actinobacteria (16.1%), Bacteroidetes (6.2%) and Cyanobacteria (2.3%). The OTU62806, representing ‘Candidatus Liberibacter’, was present with a high titer in the plants graft-inoculated with Las-infected scions treated with Gm at 100 mg/L and in the water-treated control (CK1). However, the Las bacterium was not detected in the plants graft-inoculated with Las-infected scions treated with Amp at 1.0 g/L or in plants graft-inoculated with Las-free scions (CK2). The PhyloChip array demonstrated that more OTUs, at a higher abundance, were detected in the Gm-treated plants than in the other treatment and the controls. Pairwise comparisons indicated that 23 OTUs from the Achromobacter spp. and 12 OTUs from the Methylobacterium spp. were more abundant in CK2 and CK1, respectively. Ten abundant OTUs from the Stenotrophomonas spp. were detected only in the Amp-treatment. These results provide new insights into microbial communities that may be associated with the progression of citrus huanglongbing (HLB) and the potential effects of antibiotics on the disease and microbial ecology.
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