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Search Results: 1 - 10 of 61232 matches for " Hong Ma "
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The Ray Wu Society for Life Sciences
Hong Ma
Chinese Science Bulletin , 2003, DOI: 10.1007/BF03187063
Abstract:
Evolutionary history of histone demethylase families: distinct evolutionary patterns suggest functional divergence
Xiaofan Zhou, Hong Ma
BMC Evolutionary Biology , 2008, DOI: 10.1186/1471-2148-8-294
Abstract: We performed systematic phylogenetic analysis of these histone demethylase families and uncovered different evolutionary patterns. The KDM1 genes have been maintained with a stable low copy number in most organisms except for a few duplication events in flowering plants. In contrast, multiple genes for JmjC proteins with distinct domain architectures were present before the split of major eukaryotic groups, and experienced subsequent birth-and-death evolution. In addition, distinct evolutionary patterns can also be observed between animal and plant histone demethylases in both families. Furthermore, our results showed that some JmjC subfamilies contain only animal genes with specific demethylase activities, but do not have plant members.Our study improves the understanding about the evolutionary history of KDM1 and JmjC genes and provides valuable insights into their functions. Based on the phylogenetic relationship, we discussed possible histone demethylase activities for several plant JmjC proteins. Finally, we proposed that the observed differences in evolutionary pattern imply functional divergence between animal and plant histone demethylases.One important mechanism for eukaryotic gene regulation is the epigenetic regulation of chromatin structure. The basic unit of chromatin is the nucleosome, which consists of 146 bp of DNA wrapped around an octamer of four histone proteins, H2A, H2B, H3, and H4. Histone proteins can be modified on the N-terminal tail and the modifications can disrupt the interaction between nucleosomes to prevent the packaging of chromatin into higher order structures; also the modified tails can serve as binding sites for chromatin modifiers, facilitating their functions [1]. Histone modifications, such as methylation and acetylation, have been well studied and many of the sites for the modifications are known [1]. For example, methylation can take place on several lysine residues on histone H3 and H4 (H3K4, H3K9, H3K27, H3K36, etc.) and ea
A test of Snowmelt Runoff Model (SRM) for the Gongnaisi River basin in the western Tianshan Mountains, China
Hong Ma,Guodong Cheng
Chinese Science Bulletin , 2003, DOI: 10.1007/BF03182862
Abstract: The Snowmelt Runoff Model (SRM) is one of a very few models in the world today that requires remote sensing derived snow cover as model input. Owing to its simple data requirements and use of remote sensing to provide snow cover information, SRM is ideal for use in data sparse regions, particularly in remote and inaccessible high mountain watersheds. In order to verify the applicability of SRM in an environment of continental climate, a test of SRM is performed for the Gongnaisi River basin in the western Tianshan Mountains, the results show that two SRM average goodness-of-fit statistics for simulations, Nash-Sutcliff coefficient (R 2) and volume difference (D v), are 0.87 and 0.90%, respectively. As compared with the application results over 80 basins in 25 different countries around the world, SRM performs well in the Gongnaisi River basin. The results also show that SRM can be a validated snowmelt runoff model capable of being applied in the western Tianshan Mountains. On the basis of snowmelt runoff simulation, together with a set of simplified hypothetical climate scenarios, SRM is also used to simulate the effects of climate change on snow cover and the consecutive snowmelt runoff. For a given hypothetical temperature increase of 4°C, the snow coverage and snowmelt season shift towards earlier dates, and the snowmelt runoff, as a result, is changed significantly at the same time. The simulation results show that the snow cover is sensitive to changes of climate, especially to the increase of temperature, the major effect of climate change will be a time shifting of snowmelt runoff to early spring months, resulting in a redistribution of seasonally runoff throughout the whole snowmelt season.
The Ray Wu Society for Life Sciences
MA Hong,
MAHong

科学通报(英文版) , 2003,
Abstract: The Ray Wu Society for Life Sciences (RWS) is a non-profit professional society of Chinese-American and Chinese life scientists with the goal to promote scientific communication among the scientists between USA and China and the life science research in China. The members of the RWS, now numbered more than 300, are a group of elite biologists who have reached the level of assistant professor or equivalent in their careers and are experts of their respective fields including molecular biology and genetics, cell and developmental biology, me- dicine, pharmacology, plant biology, and biotechnology. RWS was founded in early 1998 by a group of life scientists who have come from China during the last 22 years. With the encouragement of Dr. Chris Tan, the Director of the Molecular Biology Institute in Singapore, who proposed to set up a fund in the name of Prof. Ray Wu of Cornell University to recognize his contribution to the academic exchange between China and the USA. A quick positive response was reflected from American Chinese scholars with a further proposal of forming a professional society. This initiative spread rapidly and widely throughout the existing networks of Chinese life-science professionals.
Effects of Yangyin Shengjin Decoction on hemorheological parameters and coagulation factors in model rabbits with syndrome of excessive heat consuming body fluid and blood stasis
MA Hong,YANG Jin
Zhong Xi Yi Jie He Xue Bao , 2005,
Abstract: Objective: To investigate the effects of Yangyin Shengjin Decoction (YYSJD) on hemorheological parameters and coagulation factors in model rabbits with syndrome of excessive heat consuming body fluid and blood stasis. Methods: Rabbit model with syndrome of excessive heat consuming body fluid and blood stasis was produced. The effects of YYSJD on the blood viscosity, erythrocyte sedimentation rate (ESR), hematocrit, platelet aggregation rate, prothrombin time (PT), thrombin time (TT), kaolin partial thromboplastin time (KPTT), fibrinogen (Fg), thromboxane B2 (TXB2), and 6-keto-prostaglandin F1α (6-keto-PGF1α) in the model rabbits were observed. Results: YYSJD decreased the whole blood viscosity and hematocrit, inhibited the platelet aggregation, prolonged PT, TT and KPTT, and reduced the content of Fg. It also regulated the balance between TXB2 and 6-keto-PGF1α. Conclusion: YYSJD can promote the blood circulation, adjust the blood agglutinating function, and decrease the formation of thrombus. This is one of the pharmacological mechanisms of the therapeutic method of "nourishing yin to promote blood circulation" in the theory of traditional Chinese medicine for seasonal febrile diseases.
Analysis on the Flora of Seed Plant in Yulongshan National Forest Park
MA Hong-ju
Journal of Chongqing Normal University , 2010,
Abstract: Flora of seed plant in Yulongshan, a national forest park in Chongqing municipatlity ,was analyzed based on field investigation. The floristic characteristics of the studied area are as follows:1)The species richness of need plant is high. There are 1074 species of speed plants belong to 150families and 600 genera, among which gymnosperms contain 18 species, 8 families and 15 genera, and angiosperms contain 1056 species, 585 genera and 142 families. 2)The style of distributing is complex. The species composition represents most of families and almost all genera distributed in China.3)The seed plant origin is antiquity. 4) There exists obvious dominant species. 5) The plant life form is abundance. Though most of the plant species are herbaceous plant, the woody plant may play much more role for the forest to carry out its function.6)The present flora has a complex geographical component, possess obvious temperate floristic characteristics but with a tropical floristic origin. 7)Compared with the neighboring scenic spots, there are more families and genera and less species in the park.The results may be some help for the build of the forest park.
Quantum Algorithms for Unit Group and principal ideal problem
Hong Wang,Zhi Ma
Physics , 2010,
Abstract: Computing the unit group and solving the principal ideal problem for a number field are two of the main tasks in computational algebraic number theory. This paper proposes efficient quantum algorithms for these two problems when the number field has constant degree. We improve these algorithms proposed by Hallgren by using a period function which is not one-to-one on its fundamental period. Furthermore, given access to a function which encodes the lattice, a new method to compute the basis of an unknown real-valued lattice is presented.
Competition between phase coherence and correlation in a mixture of Bose-Einstein condensates
Hong Ma,Tao Pang
Physics , 2003,
Abstract: Two-species hard-core bosons trapped in a three-dimensional isotropic harmonic potential are studied with the path-integral quantum Monte Carlo simulation. The double condensates show two distinct structures depending on how the external potentials are set. Contrary to the mean-field results, we find that the heavier particles form an outer shell under an identical external potential whereas the lighter particles form an outer shell under the equal energy spacing condition. Phase separations in both the spatial and energy spaces are observed. We provide physical interpretations of these phase separations and suggest future experiment to confirm these findings.
Condensate-profile asymmetry of a boson mixture in a disk-shaped harmonic trap
Hong Ma,Tao Pang
Physics , 2004, DOI: 10.1103/PhysRevA.70.063606
Abstract: A mixture of two types of hard-sphere bosons in a disk-shaped harmonic trap is studied through path-integral quantum Monte Carlo simulation at low temperature. We find that the system can undergo a phase transition to break the spatial symmetry of the model Hamiltonian when some of the model parameters are varied. The nature of such a phase transition is analyzed through the particle distributions and angular correlation functions. Comparisons are made between our calculations and the available mean-field results on similar models. Possible future experiments are suggested to verify our findings.
Nuclear dependence asymmetries in direct photon production
Hong Shen,Ma Luo
Physics , 2000, DOI: 10.1016/S0370-2693(00)00903-5
Abstract: We study the nuclear dependences of high-$p_T$ jet cross sections in one photon and one jet production in proton-nucleus collisions. We find that there exist asymmetries between the outgoing jets and photons. A convincing reason responsible for those asymmetries are demonstrated in perturbative QCD. Significant nuclear enhancements are also found in the inclusive jet cross sections.
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