排序方式: 共有29条查询结果,搜索用时 343 毫秒
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Bentley DR Deloukas P Dunham A French L Gregory SG Humphray SJ Mungall AJ Ross MT Carter NP Dunham I Scott CE Ashcroft KJ Atkinson AL Aubin K Beare DM Bethel G Brady N Brook JC Burford DC Burrill WD Burrows C Butler AP Carder C Catanese JJ Clee CM Clegg SM Cobley V Coffey AJ Cole CG Collins JE Conquer JS Cooper RA Culley KM Dawson E Dearden FL Durbin RM de Jong PJ Dhami PD Earthrowl ME Edwards CA Evans RS Gillson CJ Ghori J Green L Gwilliam R Halls KS Hammond S Harper GL Heathcott RW Holden JL 《Nature》2001,409(6822):942-943
We constructed maps for eight chromosomes (1, 6, 9, 10, 13, 20, X and (previously) 22), representing one-third of the genome, by building landmark maps, isolating bacterial clones and assembling contigs. By this approach, we could establish the long-range organization of the maps early in the project, and all contig extension, gap closure and problem-solving was simplified by containment within local regions. The maps currently represent more than 94% of the euchromatic (gene-containing) regions of these chromosomes in 176 contigs, and contain 96% of the chromosome-specific markers in the human gene map. By measuring the remaining gaps, we can assess chromosome length and coverage in sequenced clones. 相似文献
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E. V. Orsi M. Franko L. Rodriquez H. T. Holden 《Cellular and molecular life sciences : CMLS》1969,25(2):181-182
Résumé Nous avons trouvé le virus SV40 chez le singeCercopithecus aethiops présumé non infecté. Par la méthode de culture des cellules du rein et en effectuant des passages rapides nous avons pu démontrer l'existence du virus même chez les animaux dépourvus d'anticorps et même dans le cas où le virus n'apparaissait pas durant le premier passage. 相似文献
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Differences in isotopic abundances between meteorites and rocks on Earth leave unclear the true composition of the gas out of which the Solar System formed. The Sun should have preserved in its outer layers the original composition, and recent work has indicated that the solar wind is enriched in 16O, relative to Earth, Mars and bulk meteorites. This suggests that self-shielding of CO due to photo-dissociation, which is a well understood process in molecular clouds, also led to evolution in the isotopic abundances in the early Solar System. Here we report measurements of oxygen isotopic abundances in lunar grains that were recently exposed to the solar wind. We find that 16O is underabundant, opposite to an earlier finding based on studies of ancient metal grains. Our result, however, is more difficult to understand within the context of current models, because there is no clear way to make 16O more abundant in Solar System rocks than in the Sun. 相似文献
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Complete genome sequence of a multiple drug resistant Salmonella enterica serovar Typhi CT18. 总被引:33,自引:0,他引:33
J Parkhill G Dougan K D James N R Thomson D Pickard J Wain C Churcher K L Mungall S D Bentley M T Holden M Sebaihia S Baker D Basham K Brooks T Chillingworth P Connerton A Cronin P Davis R M Davies L Dowd N White J Farrar T Feltwell N Hamlin A Haque T T Hien S Holroyd K Jagels A Krogh T S Larsen S Leather S Moule P O'Gaora C Parry M Quail K Rutherford M Simmonds J Skelton K Stevens S Whitehead B G Barrell 《Nature》2001,413(6858):848-852
Salmonella enterica serovar Typhi (S. typhi) is the aetiological agent of typhoid fever, a serious invasive bacterial disease of humans with an annual global burden of approximately 16 million cases, leading to 600,000 fatalities. Many S. enterica serovars actively invade the mucosal surface of the intestine but are normally contained in healthy individuals by the local immune defence mechanisms. However, S. typhi has evolved the ability to spread to the deeper tissues of humans, including liver, spleen and bone marrow. Here we have sequenced the 4,809,037-base pair (bp) genome of a S. typhi (CT18) that is resistant to multiple drugs, revealing the presence of hundreds of insertions and deletions compared with the Escherichia coli genome, ranging in size from single genes to large islands. Notably, the genome sequence identifies over two hundred pseudogenes, several corresponding to genes that are known to contribute to virulence in Salmonella typhimurium. This genetic degradation may contribute to the human-restricted host range for S. typhi. CT18 harbours a 218,150-bp multiple-drug-resistance incH1 plasmid (pHCM1), and a 106,516-bp cryptic plasmid (pHCM2), which shows recent common ancestry with a virulence plasmid of Yersinia pestis. 相似文献
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This paper examines the quarterly forecasts by the U.K. National Institute of Economic and Social Research of the rate of inflation and the change in real gross domestic product and its components for horizons of one to four quarters ahead in the U.K. The forecasts are tested to see if they satisfy three implications of the rational expectations hypothesis: unbiasedness, efficiency and consistency. Explicit consideration is given to the information set available when the forecasts are made. In general, the data are consistent with the rational expectations hypothesis and our results provide encouragement for the view that aggregate expectations will meet the ex post requirements of rationality. 相似文献
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Parkhill J Sebaihia M Preston A Murphy LD Thomson N Harris DE Holden MT Churcher CM Bentley SD Mungall KL Cerdeño-Tárraga AM Temple L James K Harris B Quail MA Achtman M Atkin R Baker S Basham D Bason N Cherevach I Chillingworth T Collins M Cronin A Davis P Doggett J Feltwell T Goble A Hamlin N Hauser H Holroyd S Jagels K Leather S Moule S Norberczak H O'Neil S Ormond D Price C Rabbinowitsch E Rutter S Sanders M Saunders D Seeger K Sharp S Simmonds M Skelton J Squares R Squares S Stevens K 《Nature genetics》2003,35(1):32-40
Bordetella pertussis, Bordetella parapertussis and Bordetella bronchiseptica are closely related Gram-negative beta-proteobacteria that colonize the respiratory tracts of mammals. B. pertussis is a strict human pathogen of recent evolutionary origin and is the primary etiologic agent of whooping cough. B. parapertussis can also cause whooping cough, and B. bronchiseptica causes chronic respiratory infections in a wide range of animals. We sequenced the genomes of B. bronchiseptica RB50 (5,338,400 bp; 5,007 predicted genes), B. parapertussis 12822 (4,773,551 bp; 4,404 genes) and B. pertussis Tohama I (4,086,186 bp; 3,816 genes). Our analysis indicates that B. parapertussis and B. pertussis are independent derivatives of B. bronchiseptica-like ancestors. During the evolution of these two host-restricted species there was large-scale gene loss and inactivation; host adaptation seems to be a consequence of loss, not gain, of function, and differences in virulence may be related to loss of regulatory or control functions. 相似文献
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Genome sequence of Yersinia pestis, the causative agent of plague 总被引:59,自引:0,他引:59
Parkhill J Wren BW Thomson NR Titball RW Holden MT Prentice MB Sebaihia M James KD Churcher C Mungall KL Baker S Basham D Bentley SD Brooks K Cerdeño-Tárraga AM Chillingworth T Cronin A Davies RM Davis P Dougan G Feltwell T Hamlin N Holroyd S Jagels K Karlyshev AV Leather S Moule S Oyston PC Quail M Rutherford K Simmonds M Skelton J Stevens K Whitehead S Barrell BG 《Nature》2001,413(6855):523-527
The Gram-negative bacterium Yersinia pestis is the causative agent of the systemic invasive infectious disease classically referred to as plague, and has been responsible for three human pandemics: the Justinian plague (sixth to eighth centuries), the Black Death (fourteenth to nineteenth centuries) and modern plague (nineteenth century to the present day). The recent identification of strains resistant to multiple drugs and the potential use of Y. pestis as an agent of biological warfare mean that plague still poses a threat to human health. Here we report the complete genome sequence of Y. pestis strain CO92, consisting of a 4.65-megabase (Mb) chromosome and three plasmids of 96.2 kilobases (kb), 70.3 kb and 9.6 kb. The genome is unusually rich in insertion sequences and displays anomalies in GC base-composition bias, indicating frequent intragenomic recombination. Many genes seem to have been acquired from other bacteria and viruses (including adhesins, secretion systems and insecticidal toxins). The genome contains around 150 pseudogenes, many of which are remnants of a redundant enteropathogenic lifestyle. The evidence of ongoing genome fluidity, expansion and decay suggests Y. pestis is a pathogen that has undergone large-scale genetic flux and provides a unique insight into the ways in which new and highly virulent pathogens evolve. 相似文献
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Kevin Holden 《科学通报(英文版)》2015,(1):146-148,1
The leaders of China’s high energy physics sector will soon unveil initial designs for the world’s most technologically advanced circular collider,set to stage near-speed-of-light particle collisions aimed at recreating the conditions of the universe in the instant following the Big Bang.By accelerating beams of leptons or hadrons to nearly300,000 km/s before colliding them inside the ringed 相似文献