ρ--混合序列部分和乘积的几乎处处中心极限定理的推广ρ--混合序列部分和乘积的几乎处处中心极限定理的推广

研究了ρ--混合序列部分和乘积的几乎处处中心极限定理。利用ρ--混合序列加权和的中心极限定理,得到了一般权重下,ρ--混合序列部分和乘积的几乎处处中心极限定理,推广了已有文献的结果。     

ρ~--混合序列部分和乘积的几乎处处中心极限定理的注记

设{X_n,n≥1}是一严平稳的ρ~--混合随机变量序列,利用矩不等式及加权和的中心极限定理,得到了一般权重下ρ~--混合序列部分和乘积的几乎处处中心极限定理.     

随机元序列几乎处处中心极限定理的推广

讨论随机元序列和随机变量序列函数的几乎处处中心极限定理, 推广了经典几乎处处中心极限定理中的权重, 并改进了经典几乎处处中心极限定理的证明.     

随机变量序列的几个极限定理

利用停时技术的方法,研究了随机变量序列的一类极限定理。作为推论,得到了若干经典的独立随机变量序列的极限定理和一类鞅差序列的极限定理。     

中心极限定理介绍

对中心极限定理作了简明的介绍,包括独立同分布样本的经典中心极限定理,独立但不同分布的Lindeberg—Feller中心极限定理和m-相依序列的中心极限定理。特别对m一相依序列中心极限定理,给出了一个新的、更为简单易懂的证明。还讨论了对经典中心极限定理的近似的改进,包括Berry—Essen界和Edgeworth展式。     

优化权重下平稳高斯序列的部分和与最大值的几乎处处中心极限定理

在协方差满足一定条件下,研究平稳高斯序列的部分和与最大值的几乎处处中心极限定理,获得平稳高斯序列的加权函数形式的几乎处处中心极限定理,此结果推广Marcin Dudzinski在对数平均下的平稳高斯序列的几乎处处中心极限定理.     

优化权重下ρ-混合序列部分和的几乎处处中心极限定理

将已有的ρ-混合序列部分和的几乎处处中心极限定理权重由dk=1/k推广到dk=logαk/k(α≥-1),得到优化权重下部分和的几乎处处中心极限定理.     

相关随机序列的大数定律和中心极限定理

本文针对一类相关随机序列，获得了均方意义下的大数定律和中心极限定理，从某种意义上讲，它是独立随机序列大数定律和中心极限定理的推广。     

ρ-混合序列部分和之和乘积的几乎处处中心极限定理

在适当的假设条件下, 利用混合序列加权和的中心极限定理及矩不等式, 证明了混合序列部分和之和乘积的几乎处处中心极限定理.     

一类统计量乘积的几乎处处中心极限定理

利用NA序列的几乎处处中心极限定理,给出了一类统计量乘积的几乎处处中心极限定理,推广了独立情形的结论。     

Independent evolution of structural and coding regions in a Neurospora mitochondrial intron

The discovery of intervening sequences (introns) in eukaryotic genes has raised questions about the origin and evolution of these sequences. Hypotheses concerning these topics usually consider the intron as a unit that could be lost or gained over time, or as a region within which recombination can occur to facilitate the production of new proteins by exon shuffling. Additional complexities are observed in introns of mitochondrial and chloroplast genes which contain secondary structures required for messenger RNA splicing and open-reading frames encoding proteins. Here we describe differences in the organization of protein-coding sequences in the intron of the mitochondrial ND1 gene in two closely related species of Neurospora. These differences show that intron sequences involved in secondary structure formation and in protein coding can evolve as physically distinct elements. Indeed, the secondary structure elements of the ND1 intron can contain two different coding sequences located at two different positions within the intron.     

4种昆虫基因组中的线粒体假基因

为了进一步了解昆虫核基因组中线粒体假基因(Numts)序列分布情况,避免Numts序列对基于线粒体DNA(mtDNA)进行系统发育关系研究结果的误导,利用Blast N对GenBank中已完成核基因组和mtDNA测序的4种昆虫核基因组中的Numts序列进行检索,结果表明:冈比亚按蚊Anopheles gambiae中没有Numts序列;黑腹果蝇Drosophila melanogaster中仅有少量Numts序列;赤拟谷盗Tribolium castaneum和意大利蜜蜂Apis melliera基因组中Numts序列超过100条,尤其是意大利蜜蜂中的Numts序列涵盖全部mtDNA.ND2,ND4,ND5,COⅠ与lrRNA向核内转移频率高于其他mtDNA基因片段,因此,在使用其进行系统发育关系研究时需加倍谨慎.     

ND序列乘积和的强收敛性

讨论ND随机变量序列乘积和的强收敛性,将关于NA随机变量序列乘积和强收敛性的注记推广到ND的情形.     

N维复Ginzburg-Landau方程精确解的构造

运用F展开法结合齐次平衡原理,求解了N维空间中考虑带立方非线性项的复值Ginzburg-Landau方程（CGL）,得出了该方程的精确周期波解。     

白头叶猴线粒体ND4基因和D-环区的序列及其分类地位初探

用ＰＣＲ（多聚酶链式反应）扩增方法测定白头叶猴、黑叶猴和菲氏叶猴各１只的线粒体ＤＮＡＮＤ４整个基因（１３７７ｂｐ）和Ｄ－环５００多ｂｐ序列。黑叶猴与菲氏叶猴的ＮＤ４基因序列碱基差异数高达１２３，基于ＮＤ４基因的遗传距离值为８．９％；白头叶猴与黑叶猴ＮＤ４基因序列间碱基差异数为２５，遗传距离值为１．８％。在Ｄ－环区域，白头叶猴与黑叶猴间的遗传距离为４．３％，而白头叶猴、黑叶猴两者与菲氏叶猴间的遗传距离则分别高达２６．４％和２６．０％。分析结果表明，白头叶猴恐怕还只是黑叶猴的一个亚种。从保护遗传学角度看，白头叶猴应被看作一个进化显著性单元（ｅｖｏｌｕｔｉｏｎａｒｙｓｉｇｎｉｆｉｃａｎｔｕｎｉｔｓ，ＥＳＵ），在动物的保护行动中应得到充分的重视     

Ductile deformation within Upper Himalaya Crystalline Sequence and geological implications, in Nyalam area, Southern Tibet

The South Tibet Detachment System(STDS) is a flat normal fault that separates the Upper Himalaya Crystalline Sequence(UHCS) below from the Tethyan Sedimentary Sequence(TSS) above.Timing of deformations related to the STDS is critical to understand the mechanism and evolution of the Himalaya collision zone.The Nyalam detachment(ND)(～86°E) locates in the middle portion of STDS(81°-89°E).Dating of deformed leucocratic dykes that are most probably syntectonic at different depth beneath the ND,allow us to constrain the timing of deformation.(1) Dyke T11N37 located ～3500 m structurally below the ND emplaced at 27.4± 0.2 Ma;(2) Dyke T11N32 located ～1400 m structurally below the ND emplaced at 22.0±0.3 Ma;(3) T11N25 located within the top to the north STD shear zone,～150 m structurally below the ND,emplaced at 17.1±0.2 Ma.Combining ND footwall cooling history and T11N25 deformation temperature,we indicate a probable onset of top to the north deformation at ～16 Ma at this location.These results show an upward younging of the probable timing of onset of the deformation at different structural distance below the ND.We then propose a new model for deformation migration below the ND with deformation starting by pure shear deformation at depth prior to ～27.5 Ma that migrates upward at a rate of ～ 0.3 mm/a until ～18 Ma when deformation switches to top to the north shearing in the South Tibet Detachment shear zone(STDsz).As deformation on the ND stops at 14-13 Ma this would imply that significant top to the North motion would be limited to less than 5 Ma and would jeopardize the importance of lower channel flow.     

新城疫病毒分子生物学研究进展

新城疫是由新城疫病毒引起的极易传染的毁灭性疾病.由于该病发病急、致死率高,对养禽业的发展构成了严重威胁,所以被世界动物卫生组织（OIE）定为A类烈性传染病.本文概述了新城疫病毒的基因结构与功能及基因分型等问题.     

A variant associated with nicotine dependence, lung cancer and peripheral arterial disease

Smoking is a leading cause of preventable death, causing about 5 million premature deaths worldwide each year. Evidence for genetic influence on smoking behaviour and nicotine dependence (ND) has prompted a search for susceptibility genes. Furthermore, assessing the impact of sequence variants on smoking-related diseases is important to public health. Smoking is the major risk factor for lung cancer (LC) and is one of the main risk factors for peripheral arterial disease (PAD). Here we identify a common variant in the nicotinic acetylcholine receptor gene cluster on chromosome 15q24 with an effect on smoking quantity, ND and the risk of two smoking-related diseases in populations of European descent. The variant has an effect on the number of cigarettes smoked per day in our sample of smokers. The same variant was associated with ND in a previous genome-wide association study that used low-quantity smokers as controls, and with a similar approach we observe a highly significant association with ND. A comparison of cases of LC and PAD with population controls each showed that the variant confers risk of LC and PAD. The findings provide a case study of a gene-environment interaction, highlighting the role of nicotine addiction in the pathology of other serious diseases.     

青岛文昌鱼NADH脱氢酶亚基I基因片段的克隆

NADH脱氢酶亚基I是细胞电子传递链的主要成员之一，采用简并引物PCR方法获得青岛文昌鱼NADH脱氢酶亚基I基因片段，将基氨基酸序列与其他生物如佛罗里达文昌鱼，斑马鱼，爪蟾等无脊椎和脊椎动物NADH脱氢酶亚基I基因相应片段进行了同源性分析，均显示较高的同源性，研究结果证实青岛文昌鱼作为脊索动物的代表之一，与脊椎动物有着较近的亲缘关系，是从无脊椎动物到脊椎动物的过渡类型。