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Theologis A Ecker JR Palm CJ Federspiel NA Kaul S White O Alonso J Altafi H Araujo R Bowman CL Brooks SY Buehler E Chan A Chao Q Chen H Cheuk RF Chin CW Chung MK Conn L Conway AB Conway AR Creasy TH Dewar K Dunn P Etgu P Feldblyum TV Feng J Fong B Fujii CY Gill JE Goldsmith AD Haas B Hansen NF Hughes B Huizar L Hunter JL Jenkins J Johnson-Hopson C Khan S Khaykin E Kim CJ Koo HL Kremenetskaia I Kurtz DB Kwan A Lam B Langin-Hooper S Lee A Lee JM Lenz CA Li JH Li Y Lin X Liu SX Liu ZA Luros JS 《Nature》2000,408(6814):816-820
The genome of the flowering plant Arabidopsis thaliana has five chromosomes. Here we report the sequence of the largest, chromosome 1, in two contigs of around 14.2 and 14.6 megabases. The contigs extend from the telomeres to the centromeric borders, regions rich in transposons, retrotransposons and repetitive elements such as the 180-base-pair repeat. The chromosome represents 25% of the genome and contains about 6,850 open reading frames, 236 transfer RNAs (tRNAs) and 12 small nuclear RNAs. There are two clusters of tRNA genes at different places on the chromosome. One consists of 27 tRNA(Pro) genes and the other contains 27 tandem repeats of tRNA(Tyr)-tRNA(Tyr)-tRNA(Ser) genes. Chromosome 1 contains about 300 gene families with clustered duplications. There are also many repeat elements, representing 8% of the sequence. 相似文献
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香港的交通拥挤非常严重,而且好像并不能通过增加道路容量来解决,考虑到大多数拥挤地区空间的限制和增加道路容量所导致的潜在需求,交通规划人员和经济专家们为解决交通拥挤问题,已经把他们的注意力从交通供方面转移交通需求上。道路定价方法可构成交通需求管理战略的一部分,为交通拥挤问题提供了一个有效、公平、灵活的解决方案。香港特共政府已指定了一个咨询机构,来调查电子道路定价系统的需求,以及执行后的社会反应,为了 相似文献
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