Long Li

Chinese Academy of Sciences, Peping, Beijing, China

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Publications (5)46.43 Total impact

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    ABSTRACT: The proton resonant properties in 18Ne, which determine the reaction rate of the key stellar 14O(α,p)17F reaction, have been studied by using a technique of proton resonant elastic scattering of 17F+p. A 4.22 MeV/nucleon 17F radioactive ion (RI) beam was produced via a projectile-fragmentation reaction, and separated by a Radioactive Ion Beam Line in Lanzhou (RIBLL). By bombarding a thick (CH2) n target, the energy spectra of the recoiled protons were measured by two ΔE-E silicon telescopes at the center-of-mass scattering angles of θ c.m.≈175°±5°, θ c.m.≈152°±8°, respectively. Several proton resonances in 18Ne were observed clearly. A further R-matrix analysis of the experimental data is under way to determine the resonant parameters. The present work reports the preliminary results briefly. Keywordsresonant reaction–reaction rate–explosive burning–accreting binary systems
    Science China: Physics, Mechanics and Astronomy 01/2011; 54:32-36. · 1.17 Impact Factor
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    ABSTRACT: We report improved whole-genome shotgun sequences for the genomes of indica and japonica rice, both with multimegabase contiguity, or almost 1,000-fold improvement over the drafts of 2002. Tested against a nonredundant collection of 19,079 full-length cDNAs, 97.7% of the genes are aligned, without fragmentation, to the mapped super-scaffolds of one or the other genome. We introduce a gene identification procedure for plants that does not rely on similarity to known genes to remove erroneous predictions resulting from transposable elements. Using the available EST data to adjust for residual errors in the predictions, the estimated gene count is at least 38,000-40,000. Only 2%-3% of the genes are unique to any one subspecies, comparable to the amount of sequence that might still be missing. Despite this lack of variation in gene content, there is enormous variation in the intergenic regions. At least a quarter of the two sequences could not be aligned, and where they could be aligned, single nucleotide polymorphism (SNP) rates varied from as little as 3.0 SNP/kb in the coding regions to 27.6 SNP/kb in the transposable elements. A more inclusive new approach for analyzing duplication history is introduced here. It reveals an ancient whole-genome duplication, a recent segmental duplication on Chromosomes 11 and 12, and massive ongoing individual gene duplications. We find 18 distinct pairs of duplicated segments that cover 65.7% of the genome; 17 of these pairs date back to a common time before the divergence of the grasses. More important, ongoing individual gene duplications provide a never-ending source of raw material for gene genesis and are major contributors to the differences between members of the grass family.
    PLoS Biology 03/2005; 3(2):e38. · 12.69 Impact Factor
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    ABSTRACT: We have produced a draft sequence of the rice genome for the most widely cultivated subspecies in China, Oryza sativa L. ssp. indica, by whole-genome shotgun sequencing. The genome was 466 megabases in size, with an estimated 46,022 to 55,615 genes. Functional coverage in the assembled sequences was 92.0%. About 42.2% of the genome was in exact 20-nucleotide oligomer repeats, and most of the transposons were in the intergenic regions between genes. Although 80.6% of predicted Arabidopsis thaliana genes had a homolog in rice, only 49.4% of predicted rice genes had a homolog in A. thaliana. The large proportion of rice genes with no recognizable homologs is due to a gradient in the GC content of rice coding sequences.
    Science 05/2002; 296(5565):79-92. · 31.20 Impact Factor
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    ABSTRACT: C-axis YBa2Cu3O7−δ (YBCO) thin films have been grown epitaxially in the step-flow mode with the increase of vicinal angle of the SrTiO3 substrates by pulsed laser deposition. However surface hollows/cracks occurred with increasing angle, which disrupted the smoothness of the film surfaces. By reducing the oxygenate pressure during the tetragonal–orthogonal structural phase transition, the YBCO films with smooth surface was formed, but the films are superconducting at 60K. These films have good metallic property hence they can be employed as electrodes for ferroelectric heterostructures.
    Journal of Crystal Growth - J CRYST GROWTH. 01/2001; 231(4):493-497.
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    ABSTRACT: The sequence of the rice genome holds fundamental information for its biology, including physiology, genetics, development, and evolution, as well as information on many beneficial phenotypes of economic significance. Using a “whole genome shotgun” approach, we have produced a draft rice genome sequence ofOryza sativa ssp.indica, the major crop rice subspecies in China and many other regions of Asia. The draft genome sequence is constructed from over 4.3 million successful sequencing traces with an accumulative total length of 2214.9 Mb. The initial assembly of the non-redundant sequences reached 409.76 Mb in length, based on 3.30 million successful sequencing traces with a total length of 1797.4 Mb from anindica variant cultivar93-11, giving an estimated coverage of 95.29% of the rice genome with an average base accuracy of higher than 99%. The coverage of the draft sequence, the randomness of the sequence distribution, and the consistency of BIG-ASSEMBLER, a custom-designed software package used for the initial assembly, were verified rigorously by comparisons against finished BAC clone sequences from bothindica andjapanica strains, available from the public databases. Over all, 96.3% of full-length cDNAs, 96.4% of STS, STR, RFLP markers, 94.0% of ESTs and 94.9% unigene clusters were identified from the draft sequence. Our preliminary analysis on the data set shows that our rice draft sequence is consistent with the comman standard accepted by the genome sequencing community. The unconditional release of the draft to the public also undoubtedly provides a fundamental resource to the international scientific communities to facilitate genomic and genetic studies on rice biology.
    Chinese Science Bulletin 46(23). · 1.37 Impact Factor

Publication Stats

3k Citations
46.43 Total Impact Points

Institutions

  • 2002–2011
    • Chinese Academy of Sciences
      • • Institute of Modern Physics
      • • Institute of Computing Technology
      Peping, Beijing, China
  • 2005
    • Beijing Genomics Institute
      Bao'an, Guangdong, China
  • 2001
    • Ningxia University
      Ning-hsia, Ningxia Huizu Zizhiqu, China