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Search Results: 1 - 10 of 27837 matches for " Yimian Ma "
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High-Throughput Sequencing and Characterization of the Small RNA Transcriptome Reveal Features of Novel and Conserved MicroRNAs in Panax ginseng
Bin Wu, Meizhen Wang, Yimian Ma, Lichai Yuan, Shanfa Lu
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0044385
Abstract: microRNAs (miRNAs) play vital regulatory roles in many organisms through direct cleavage of transcripts, translational repression, or chromatin modification. Identification of miRNAs has been carried out in various plant species. However, no information is available for miRNAs from Panax ginseng, an economically significant medicinal plant species. Using the next generation high-throughput sequencing technology, we obtained 13,326,328 small RNA reads from the roots, stems, leaves and flowers of P. ginseng. Analysis of these small RNAs revealed the existence of a large, diverse and highly complicated small RNA population in P. ginseng. We identified 73 conserved miRNAs, which could be grouped into 33 families, and 28 non-conserved ones belonging to 9 families. Characterization of P. ginseng miRNA precursors revealed many features, such as production of two miRNAs from distinct regions of a precursor, clusters of two precursors in a transcript, and generation of miRNAs from both sense and antisense transcripts. It suggests the complexity of miRNA production in P. gingseng. Using a computational approach, we predicted for the conserved and non-conserved miRNA families 99 and 31 target genes, respectively, of which eight were experimentally validated. Among all predicted targets, only about 20% are conserved among various plant species, whereas the others appear to be non-conserved, indicating the diversity of miRNA functions. Consistently, many miRNAs exhibited tissue-specific expression patterns. Moreover, we identified five dehydration- and ten heat-responsive miRNAs and found the existence of a crosstalk among some of the stress-responsive miRNAs. Our results provide the first clue to the elucidation of miRNA functions in P. ginseng.
Comprehensive transcriptome analysis reveals novel genes involved in cardiac glycoside biosynthesis and mlncRNAs associated with secondary metabolism and stress response in Digitalis purpurea
Bin Wu, Ying Li, Haixia Yan, Yimian Ma, Hongmei Luo, Lichai Yuan, Shilin Chen, Shanfa Lu
BMC Genomics , 2012, DOI: 10.1186/1471-2164-13-15
Abstract: Through high-throughput 454 sequencing and subsequent assembly, we obtained 23532 genes, of which 15626 encode conserved proteins. We determined 140 unigenes to be candidates involved in cardiac glycoside biosynthesis. It could be grouped into 30 families, of which 29 were identified for the first time in D. purpurea. We identified 2660 mRNA-like npcRNA (mlncRNA) candidates, an emerging class of regulators, using a computational mlncRNA identification pipeline and 13 microRNA-producing unigenes based on sequence conservation and hairpin structure-forming capability. Twenty five protein-coding unigenes were predicted to be targets of these microRNAs. Among the mlncRNA candidates, only 320 could be grouped into 140 families with at least two members in a family. The majority of D. purpurea mlncRNAs were species-specific and many of them showed tissue-specific expression and responded to cold and dehydration stresses. We identified 417 protein-coding genes with regions significantly homologous or complementary to 375 mlncRNAs. It includes five genes involved in secondary metabolism. A positive correlation was found in gene expression between protein-coding genes and the homologous mlncRNAs in response to cold and dehydration stresses, while the correlation was negative when protein-coding genes and mlncRNAs were complementary to each other.Through comprehensive transcriptome analysis, we not only identified 29 novel gene families potentially involved in the biosynthesis of cardiac glycosides but also characterized a large number of mlncRNAs. Our results suggest the importance of mlncRNAs in secondary metabolism and stress response in D. purpurea.Digitalis purpurea L. (common foxglove, purple foxglove or lady's glove) is an herbaceous biennial flowering plant species. It is native to Europe and has been widely introduced into other parts of the world. Now, this plant becomes naturalized in many countries, such as China, Canada, USA, and New Zealand [1]. D. purpurea is k
El factor humano como elemento dinamizador del proceso empresarial en la gestión de la información y conocimiento
Díaz Pérez,Maidelyn; de Liz Contreras,Yimian; Rivero Amador,Soleidys;
ACIMED , 2009,
Abstract: the rhythm of changes in the enterpreneurial world caused by the global competition and the technological innovations revolution in all the areas of knowledge, have led to a substantial increase of the users of financial and non-financial information. the dynamics of the environment of the so called information or knowledge era have transformed view-points and needs on countable information, demanding that it explicitly reflects the main elements that generate benefits for the organization, chiefly those included in the intangible assets, such as the human factor, which is reflected in a certain way in the intellectual capital of the organization. at present, to have this knowledge is strategically important for the organization, and according to those studying this topic, it is a real competitive advantage. that's why, the establishment of mechanisms or models to manage this important resource have become the object of study of several interdisciplinary researches. the present work pretends to identify the current trend that characterizes the knowledge management and the intellectual capital management, as well as their integration into the information management systems.
El factor humano como elemento dinamizador del proceso empresarial en la gestión de la información y conocimiento The human factor as catalyst for the enterprises process in the information and knowledge management
Maidelyn Díaz Pérez,Yimian de Liz Contreras,Soleidys Rivero Amador
ACIMED , 2009,
Abstract: El ritmo de los cambios en el mundo empresarial, disparados por la competencia global y la revolución de las innovaciones tecnológicas en todas las áreas del conocimiento, ha conllevado a un incremento sustancial de los usuarios de la información financiera y no financiera. La dinámica del entorno de la llamada era de la información o del conocimiento ha transformado los puntos de vista y necesidades sobre la información contable y exige que esta refleje explícitamente los principales elementos generadores de los beneficios de las organizaciones, principalmente los comprendidos en los activos intangibles, donde se destaca el factor humano que a la vez se refleja, en cierta medida, en el capital intelectual de la organización. En el escenario actual, disponer de este conocimiento ha alcanzado una relevancia estratégica para la organización y constituyen, según estudiosos del tema, verdaderas ventajas competitivas. Por ello, el establecimiento de mecanismos o modelos para la gestión de este importante recurso ha constituido objeto de estudio de innumerables investigaciones interdisciplinares. Se pretende, con la presente contribución, identificar las tendencias actuales que caracterizan a la gestión del conocimiento y la gestión del capital intelectual y su integración con los sistemas de gestión de información. The rhythm of changes in the enterpreneurial world caused by the global competition and the technological innovations revolution in all the areas of knowledge, have led to a substantial increase of the users of financial and non-financial information. The dynamics of the environment of the so called information or knowledge era have transformed view-points and needs on countable information, demanding that it explicitly reflects the main elements that generate benefits for the organization, chiefly those included in the intangible assets, such as the human factor, which is reflected in a certain way in the intellectual capital of the organization. At present, to have this knowledge is strategically important for the organization, and according to those studying this topic, it is a real competitive advantage. That's why, the establishment of mechanisms or models to manage this important resource have become the object of study of several interdisciplinary researches. The present work pretends to identify the current trend that characterizes the knowledge management and the intellectual capital management, as well as their integration into the information management systems.
Características de los sistemas de información que permiten la gestión oportuna de la información y el conocimiento institucional Features of information systems that make possible the opportune organizational information and knowledge management
Maidelyn Díaz Pérez,Yimian de Liz Contreras,Soleidys Rivero Amador
ACIMED , 2009,
Abstract:
The Equitable Total Chromatic Number of Some Join graphs  [PDF]
Gang MA, Ming MA
Open Journal of Applied Sciences (OJAppS) , 2012, DOI: 10.4236/ojapps.2012.24B023
Abstract: A proper total-coloring of graph G is said to be?equitable if the number of elements (vertices and edges) in any?two color classes differ by at most one, which the required?minimum number of colors is called the equitable total chromatic?number. In this paper, we prove some theorems on equitable?total coloring and derive the equitable total chromatic numbers?of Pm V?Sn, Pm V?Fn and Pm V Wn.
Improvements and Generalizations of Stochastic Knapsack and Multi-Armed Bandit Approximation Algorithms: Full Version
Will Ma
Computer Science , 2013,
Abstract: The multi-armed bandit (MAB) problem features the classical tradeoff between exploration and exploitation. The input specifies several stochastic arms which evolve with each pull, and the goal is to maximize the expected reward after a fixed budget of pulls. The celebrated work of Gittins et al. [GGW89] presumes a condition on the arms called the martingale assumption. Recently, A. Gupta et al. obtained an LP-based 1/48-approximation for the problem with the martingale assumption removed [GKMR11]. We improve the algorithm to a 4/27-approximation, with simpler analysis. Our algorithm also generalizes to the case of MAB superprocesses with (stochastic) multi-period actions. This generalization captures the framework introduced by Guha and Munagala in [GM07a, GM07b], and yields new results for their budgeted learning problems. Also, we obtain a (1/2-eps)-approximation for the variant of MAB where preemption (playing an arm, switching to another arm, then coming back to the first arm) is not allowed. This contains the stochastic knapsack problem of Dean, Goemans, and Vondrak [DGV08] with correlated rewards, where we are given a knapsack of fixed size, a set of jobs each with a joint distribution for its size and reward, and the objective is to maximize expected reward before the knapsack size is exhausted. Our (1/2-eps)-approximation improves the 1/16 and 1/8 approximations of [GKMR11] for correlated stochastic knapsack with cancellation and no cancellation, respectively, providing the first tight algorithm for these problems that matches the integrality gap of 2. We sample probabilities from an exponential-sized dynamic programming solution, whose existence is guaranteed by an LP projection argument. We hope this technique can also be applied to other dynamic programming problems which can be projected down onto a small LP.
Liouville Type Theorems for Lichnerowicz Equations and Ginzburg-Landau Equation: Survey  [PDF]
Li Ma
Advances in Pure Mathematics (APM) , 2011, DOI: 10.4236/apm.2011.13022
Abstract: In this survey paper, we firstly review some existence aspects of Lichnerowicz equation and Ginzburg-Landau equations. We then discuss the uniform bounds for both equations in Rn. In the last part of this report, we consider the Liouville type theorems for Lichnerowicz equation and Ginzburg-Landau equations in Rn via two approaches from the use of maximum principle and the monotonicity formula
Simulation on SO2 and NOX Emission from Coal–Fired Power Plants in North-Eastern North America  [PDF]
Shuangchen Ma
Energy and Power Engineering (EPE) , 2010, DOI: 10.4236/epe.2010.23028
Abstract: MM5-SMOKE-CMAQ regional air quality modeling system was used to simulate pollutants emission from coal–fired power plants in North-Eastern North America. The effects of SO2 and NOX on air quality producing from coal-fired power plants in the summer of 2001 were analyzed. Simulations show the contributions of SO2 and NOX emission from coal-fired power plants using different scenarios, coal-fired power plants from US and Canada contribute 67.2% and 32.8% for total SO2 concentration, 17.6% and 6.0% for total NOX concentration in researched domain. Some control measures for coal-fired power plants were discussed. Further controls for the emissions of SO2 and NOX from coal-fired power plants are necessary to reduce the adverse environmental effects.
The Theory of Vector-Valued Function in Locally Convex Space  [PDF]
Lixin Ma
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.38133
Abstract: In this paper, the vector-valued regular functions are extended to the locally convex space. The residues theory of the functions in the locally convex space is achieved. Thereby the Cauchy theory and Cauchy integral formula are extended to the locally convex space.
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