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Your search keyword '"Zhang, X. L."' showing total 9 results
Start Over Author "Zhang, X. L." Journal nature
9 results on '"Zhang, X. L."'

1. A bright γ-ray flare interpreted as a giant magnetar flare in NGC 253

Author

Svinkin, D., primary, Frederiks, D., additional, Hurley, K., additional, Aptekar, R., additional, Golenetskii, S., additional, Lysenko, A., additional, Ridnaia, A. V., additional, Tsvetkova, A., additional, Ulanov, M., additional, Cline, T. L., additional, Mitrofanov, I., additional, Golovin, D., additional, Kozyrev, A., additional, Litvak, M., additional, Sanin, A., additional, Goldstein, A., additional, Briggs, M. S., additional, Wilson-Hodge, C., additional, von Kienlin, A., additional, Zhang, X.-L., additional, Rau, A., additional, Savchenko, V., additional, Bozzo, E., additional, Ferrigno, C., additional, Ubertini, P., additional, Bazzano, A., additional, Rodi, J. C., additional, Barthelmy, S., additional, Cummings, J., additional, Krimm, H., additional, Palmer, D. M., additional, Boynton, W., additional, Fellows, C. W., additional, Harshman, K. P., additional, Enos, H., additional, and Starr, R., additional

Published
2021
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2. Head and backbone of the Early Cambrian vertebrate Haikouichthys

Author

Shu, D.-G., Morris, S. Conway, Han, J., Zhang, Z.-F., Yasui, K., Janvier, P., Chen, L., Zhang, X.-L., Liu, J.-N., Li, Y., and Liu, H.-Q.

Subjects
Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

Author(s): D.-G. Shu (corresponding author) [1, 2]; S. Conway Morris [3]; J. Han [1]; Z.-F. Zhang [1]; K. Yasui [4]; P. Janvier [5]; L. Chen [1]; X.-L. Zhang [1]; J.-N. [...]

Published
2003
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3. Primitive deuterostomes from the Chengjiang Lagerstatte (Lower Cambrian, China)

Author

Shu, D.-G., Morris, S. Conway, Han, J., Chen, L., Zhang, X.-L., Zhang, Z.-F., Liu, H.-Q., Li, Y., and Liu, J.-N.

Subjects
Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

Author(s): D.-G. Shu (corresponding author) [1]; S. Conway Morris [2]; J. Han [1]; L. Chen [1]; X.-L. Zhang [1]; Z.-F. Zhang [1]; H.-Q. Liu [1]; Y. Li [1]; J.-N. Liu [...]

Published
2001
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8. A bright ?-ray flare interpreted as a giant magnetar flare in NGC 253

Author

Svinkin, D., Frederiks, D., Hurley, K., Aptekar, R., Golenetskii, S., Lysenko, A., Ridnaia, A. V., Tsvetkova, A., Ulanov, M., Cline, T. L., Mitrofanov, I., Golovin, D., Kozyrev, A., Litvak, M., Sanin, A., Goldstein, A., Briggs, M. S., Wilson-Hodge, C., von Kienlin, A., Zhang, X.-L., Rau, A., Savchenko, V., Bozzo, E., Ferrigno, C., Ubertini, P., Bazzano, A., Rodi, J. C., Barthelmy, S., Cummings, J., Krimm, H., Palmer, D. M., Boynton, W., Fellows, C. W., Harshman, K. P., Enos, H., and Starr, R.

Abstract

Soft ?-ray repeaters exhibit bursting emission in hard X-rays and soft ?-rays. During the active phase, they emit random short (milliseconds to several seconds long), hard-X-ray bursts, with peak luminosities1of 1036to 1043erg per second. Occasionally, a giant flare with an energy of around 1044to 1046erg is emitted2. These phenomena are thought to arise from neutron stars with extremely high magnetic fields (1014to 1015gauss), called magnetars1,3,4. A portion of the second-long initial pulse of a giant flare in some respects mimics short ?-ray bursts5,6, which have recently been identified as resulting from the merger of two neutron stars accompanied by gravitational-wave emission7. Two ?-ray bursts, GRB 051103 and GRB 070201, have been associated with giant flares2,8–11. Here we report observations of the ?-ray burst GRB 200415A, which we localized to a 20-square-arcmin region of the starburst galaxy NGC 253, located about 3.5 million parsecs away. The burst had a sharp, millisecond-scale hard spectrum in the initial pulse, which was followed by steady fading and softening over 0.2 seconds. The energy released (roughly 1.3 × 1046erg) is similar to that of the superflare5,12,13from the Galactic soft ?-ray repeater SGR 1806-20 (roughly 2.3 × 1046erg). We argue that GRB 200415A is a giant flare from a magnetar in NGC 253.

Published
2021
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9. DNA sequence and comparative analysis of chimpanzee chromosome 22.

Author

Watanabe H, Fujiyama A, Hattori M, Taylor TD, Toyoda A, Kuroki Y, Noguchi H, BenKahla A, Lehrach H, Sudbrak R, Kube M, Taenzer S, Galgoczy P, Platzer M, Scharfe M, Nordsiek G, Blöcker H, Hellmann I, Khaitovich P, Pääbo S, Reinhardt R, Zheng HJ, Zhang XL, Zhu GF, Wang BF, Fu G, Ren SX, Zhao GP, Chen Z, Lee YS, Cheong JE, Choi SH, Wu KM, Liu TT, Hsiao KJ, Tsai SF, Kim CG, OOta S, Kitano T, Kohara Y, Saitou N, Park HS, Wang SY, Yaspo ML, and Sakaki Y

Subjects
Animals, Chromosomes, Human, Pair 21 genetics, Gene Expression Profiling, Genes genetics, Genomics, Humans, Mutagenesis genetics, Phylogeny, Polymorphism, Single Nucleotide genetics, Promoter Regions, Genetic genetics, Repetitive Sequences, Nucleic Acid genetics, Retroelements genetics, Sequence Analysis, DNA, Chromosomes, Mammalian genetics, Evolution, Molecular, Pan troglodytes genetics, Physical Chromosome Mapping
Abstract

Human-chimpanzee comparative genome research is essential for narrowing down genetic changes involved in the acquisition of unique human features, such as highly developed cognitive functions, bipedalism or the use of complex language. Here, we report the high-quality DNA sequence of 33.3 megabases of chimpanzee chromosome 22. By comparing the whole sequence with the human counterpart, chromosome 21, we found that 1.44% of the chromosome consists of single-base substitutions in addition to nearly 68,000 insertions or deletions. These differences are sufficient to generate changes in most of the proteins. Indeed, 83% of the 231 coding sequences, including functionally important genes, show differences at the amino acid sequence level. Furthermore, we demonstrate different expansion of particular subfamilies of retrotransposons between the lineages, suggesting different impacts of retrotranspositions on human and chimpanzee evolution. The genomic changes after speciation and their biological consequences seem more complex than originally hypothesized.

Published
2004
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