维吾尔族的近亲结婚率及其遗传学效应

不同类型的近亲结婚,在不同程度上提高常染色体隐性遗传病基因的纯合率,从而大大提高常染色体隐性遗传病的发病率,因此近亲结婚是降低民族遗传素质的重要因素.     

近亲结婚及其危害效应

在遗传学上把有亲缘关系的人结婚,并有了子女叫做近亲结婚。因为有亲缘关系的人保有相同基因的机会比两个不相关的人大,所以近亲结婚的一个明显效应,就是纯合子的频率增加。人类当中隐性有害基因大都是罕见的,近亲结合的结果会使有病个体的比例增高。     

苯丙酮尿症的遗传学研究

本文对9个家系的17例苯丙酮酸尿症患儿进行了家谱的遗传学分析,并对其中11例进行了智力、体格、肤色及尿中苯丙酮酸含量的测量.结果指出:1.在46个儿童中患儿17例,隐性比率经Haldane方法校正后为b=0.312±0.081,符合隐性遗传的假定(c=0.853,P=0.4～O.3).2.9个家系中近亲结婚者有3例,占33.3%,远较群体中一般的近亲结婚比率为高.3.17例患儿中男患者11人,女患者6人,男多于女,但在统计上这个比例与男:女=1∶1没有显著差异(X~2=1.46,P=0.3～0.2).     

微聊

<正>微聚焦2015年4月《科学世界》数字刊推介颜色专辑18世纪,一场猛烈的风暴席卷了太平洋上的平格拉普岛。岛上大多数居民都失去了生命.只留下了20位幸存者,而其中有一位是全色盲。经过几百年的近亲结婚.这座岛上的全色盲越来越多。到目前.约有250人都是全色盲。然     

从人类学的角度解答谜题 西方为什么会崛起？ 不娶表亲？！

正天主教会对一夫多妻和近亲结婚的限制削弱了宗族关系,强化了核心家庭和非人格化的社会合作,使欧洲人心理上向个人主义、分析思维方向进化。这场婚姻改革运动让欧洲的市场、法治、民主、经济增长和公民社会成为可能。世界历史进入近代之后,为什么欧洲开始崛起,殖民世界,并且在经济上远远超过了中国和印度等曾经非常繁荣的国家呢?德国社会学家马克斯·韦伯将其归结为新教伦理和苦行主义。而如今,哈佛大学的约瑟夫·亨里奇教授有一个乍听起来惊世骇俗的观点:不娶表亲。     

我国婚姻效力制度的经济分析

按照经济分析法学的法律目的观,婚姻效力制度应当符合效率的要求。我国婚姻制度将重婚和近亲结婚规定为无效婚姻是契合婚姻效率要求的,但完全不承认事实婚姻和同居的法律效力、把患有医学上认为不应当结婚的疾病和未达到法定婚龄的一概设置为无效婚姻则是非效率的。因此,有必要对我国婚姻效力制度进行修改。     

近亲婚配与人类健康

近亲结婚给人类带来的不幸是相当大的。它能提高人类各种遗传病、畸形儿和先天性愚型发生的频率,直接影响人类的身体健康和智力发展。 伟大的科学家达尔文与表姐结婚后,一共生了10个孩子,但没有一个能让达尔文夫妇抱上孙子或外孙,其中多数患了精神病。十八世纪欧州一些国家盛行一种血友病,病人一旦碰破皮肤就流血不止而死亡,因此病多发生于皇室人员,故又称皇室病,也是由于皇族之间长     

遗传性耳聋综合征3例报告

新生儿中听力障碍发病率为1/1000,其中一半是遗传因素所致。语前聋中30%是综合征型遗传性耳聋〔1〕。我们对大理州特殊教育学校110例聋哑学生病因调查中发现3例少见的遗传性耳聋综合征,现报道并分析如下:病例1:女、16岁,汉族。无特殊病史,父母否认近亲结婚。体检:营养中等,发育     

浅谈苯丙酮尿症

苯丙酮尿症是由氨基酸代谢异常引起的一种常染色体隐性遗传性疾病,多见于小儿。临床上患儿异常情况在一岁左右最明显,以智能发育落后为主,行为异常、多动甚或有肌痉挛或癫痫小发作等神经系统严重损害症状;患儿的外貌在出生数月后因黑色素合成不足,皮肤白嫩、头发细黄、眼巩膜呈蓝色。其尿和汗液有鼠尿样恶臭。防治此病的关键是避免近亲结婚,早期诊断和早期治疗。     

虎子『断尾』

虎子是一条狗的名字。它的主人叫二精。二精的父母属于近亲结婚,虽然生了5个孩子,除了二精外,其余4个都是痴呆。那时社会上搞“文化大革命”,学校也因此停课。大院里的孩子仿佛一下子进了天堂,整天一起上房掏麻雀,下河去摸柳叶鱼,简直玩疯了。二精虽说是他们兄弟中最精明的一个,无奈出身于呆傻家庭,偏又身体单薄,所以很自然地成了大院里孩子们的撒气筒。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-