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基于DNA序列K-tuple分布的一种非序列比对分析 被引量:3
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作者 沈娟 吴文武 +2 位作者 解小莉 郭满才 袁志发 《遗传》 CAS CSCD 北大核心 2010年第6期606-612,共7页
文章在基因组K-tuple分布的基础上,给出了一种推测生物序列差异大小的非序列比对方法。该方法可用于衡量真实DNA序列和随机重排序列在K-tuple分布上的差异。将此方法用于构建含有26种胎盘哺乳动物线粒体全基因组的系统树时,随着K的增大... 文章在基因组K-tuple分布的基础上,给出了一种推测生物序列差异大小的非序列比对方法。该方法可用于衡量真实DNA序列和随机重排序列在K-tuple分布上的差异。将此方法用于构建含有26种胎盘哺乳动物线粒体全基因组的系统树时,随着K的增大,系统树的分类效果与生物学一致公认的结果愈加匹配。结果表明,用此方法构建的系统进化树比用其他非序列比对分析方法构建的更加合理。 展开更多
关键词 k-tuple 非序列比对 DNA序列 线粒体全基因组 系统树
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The Integral of the Inverse of the Primes
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作者 Pal Doroszlai Horacio Keller 《Advances in Pure Mathematics》 2023年第5期250-266,共17页
The present paper gives the proof of the set of primes as continuum and evaluates the analytical formula for the integral of the inverse of the primes over the distance. First it starts with the density of the primes,... The present paper gives the proof of the set of primes as continuum and evaluates the analytical formula for the integral of the inverse of the primes over the distance. First it starts with the density of the primes, shortly recapitulates the prime-number-formula and the complete-prime-number-formula, the proof of the set of primes as continuum. The theoretical evaluation is followed in annexes by numerical evaluation of the theoretical results and of different constants, which represent inherent properties of the set of primes. 展开更多
关键词 Density of Primes Prime-Number-Formula Complete-Prime-Number-Formula Goldbach’s Conjecture Twin Primes k-tuples of Primes Primes as Continuum
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DNA序列信息内容的普适关系 被引量:2
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作者 罗辽复 《合肥学院学报(自然科学版)》 2005年第1期1-6,31,共7页
为描述基因组中k tuple(k字)频数分布的特征,定义了4种信息量,对若干典型基因组序列进行了统计分析,研究了信息量与字长k的普适关系,解释了普适性的根源在于DNA序列的近中性进化,指出真正的挑战在于对特异字的探索,对特异字在DNA RNA ... 为描述基因组中k tuple(k字)频数分布的特征,定义了4种信息量,对若干典型基因组序列进行了统计分析,研究了信息量与字长k的普适关系,解释了普适性的根源在于DNA序列的近中性进化,指出真正的挑战在于对特异字的探索,对特异字在DNA RNA 蛋白质相互作用信息系统中的含义做了初步讨论。 展开更多
关键词 k-tuple频数 信息量 普适关系 特异字 基因组序列
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Triples of almost primes
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作者 Jiamin Li Jianya Liu 《Science China Mathematics》 SCIE CSCD 2023年第12期2779-2794,共16页
The k-tuple conjecture of Hardy and Little wood predicts that there are infinitely many primes p such that p+2 and p+6 are primes simultaneously.In this paper,we prove that there are infinitely many primes p such that... The k-tuple conjecture of Hardy and Little wood predicts that there are infinitely many primes p such that p+2 and p+6 are primes simultaneously.In this paper,we prove that there are infinitely many primes p such that Ω(p+2)≤3 and Ω(p+6)≤6,where Ω(n) denotes the total number of prime divisors of an integer n.We also prove a better conditional result,with the above Ω(p+6)≤6 replaced by Ω(p+6)≤3,under the Elliott-Halberstam conjecture. 展开更多
关键词 the k-tuple conjecture of Hardy and Littlewood almost prime vector sieve weighted sieve
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SeeDNA: A Visualization Tool for K-string Content of Long DNA Sequences and Their Randomized Counterparts 被引量:2
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作者 JunjieShen ShuyuZhang +1 位作者 Hoong-ChienLee BailinHao 《Genomics, Proteomics & Bioinformatics》 SCIE CAS CSCD 2004年第3期192-196,共5页
Fudan University, Shanghai 200433, China; Department of Physics, National Central University, Chungli, 3 Taiwan 320, China; Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100080, China. 4 An in... Fudan University, Shanghai 200433, China; Department of Physics, National Central University, Chungli, 3 Taiwan 320, China; Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100080, China. 4 An interactive tool to visualize the K-string composition of long DNA sequences including bacterial complete genomes is described. It is especially useful for ex- ploring short palindromic structures in the sequences. The SeeDNA program runs on Red Hat Linux with GTK+ support. It displays two-dimensional (2D) or one-dimensional (1D) histograms of the K-string distribution of a given sequence and/or its randomized counterpart. It is also capable of showing the di?erence of K-string distributions between two sequences. The C source code using the GTK+ package is freely available. 展开更多
关键词 k-tuple visualization PALINDROME randomized sequence
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