藏系绵羊染色体的显带研究

采用外周血淋巴细胞培养制备染色体及染色体显带技术,对藏系绵羊(山谷型)的显带核型进行了较全面的研究。对该品种的染色体核型、G带、C带、R带和Ag—NORs进行了观察和分析,并根据实验结果绘制了该品种的G带核型模式图。在此基础上,对各种显带核型进行了初步的讨论。为藏系绵羊的研究提供了细胞遗传学方面的资料。     

成都麻羊、吐根堡山羊及其杂交后代染色体显带的比较研究

采用外周血淋巴细胞培养制备染色体及G带、C带和银染技术,对成都麻羊、吐根堡山羊及其杂交后代的染色体进行了比较研究,并根据实验结果绘制了山羊G带核型模式图.这三种羊的染色体数目为2n=60;普通核型和G带核型在三种羊之间无显著差异;不同种类的山羊C带核型有差异;Ag—NORs频率在不同种类的山羊中差异显著.因此,C带核型和Ag—NORs频率的研究可以为山羊的杂交育种提供一定的细胞遗传学依据.     

广东梅花猪和云南小耳猪显带染色体比较研究

利用染色体显带技术对广东梅花猪、云南小耳猪的染色体G带、R带、Q带、C带进行了比较研究,结果表明:G带、R带在品种间基本无差异,由此绘制了G带模式图;C带在品种内和品种间均具多态性,尤其端着丝粒染色体的C带结构异染色质多态性更为明显.     

广东梅花猪和云南小耳猪显带染色体比较研究

赵亚力,等.生物系四川大学学报(自然科学版)1992,29(1):144～148利用染色体显带技术对广东梅花猪、云南小耳猪的染色体 G 带、R 带、Q 带、C 带进行了比较研究,结果表明:G 带、R 带在品种间基本无差异,由此绘制了 G 带模式图;C 带在品种内和品种间均具多态性,尤其端着丝粒染色体的 C 带结构异染色质多态性更为明显.     

西安地区黄胸鼠(Rattusflavipectus)的染色体研究

西安地区黄胸鼠(Rattus flavipectus)的核型分析结果表明,染色体数目2n=42。常染色体由13对末端着丝粒染色体以及7对小的中着丝粒染色体组成。性染色体XY 是一对大小不等的末端着丝粒染色体。时染色体的 G—带,C—带和 Ag—带也做了观察分析,所得结果与 Yosida(1973)的文献资料相比较可以看出,西安地区黄胸鼠的核型可能是从亚洲型黑家鼠(Rattus rattus tanezumi)演化而来的。     

南京地区褐家鼠和黄胸鼠的染色体分带研究...

用骨髓染色体制片方法,对南京地区褐家鼠和黄胸鼠的核型、C带和G带进行了现察分析,并与前人报道作了比较,发现它们的核型和带型均显示出一定的差异.本研究为分析我国的家鼠属动物的染色体进化提供了基本资料。     

新发现的毛冠鹿的一核型与性染色体探讨

以原代培养和传代培养的方法培养成年雄性毛冠鹿的皮肤细胞,对其核型进行分析,发现了一种新的核型,二倍体染色体数为2n=48,染色体正好配成24对,其中有一对为异型染色体.该对异型染色体的一条为较大的端着丝粒染色体,长度仅次于第3号染色体,C带与薄层扫描显示其异染色质丰富.另一条为较大的近端着丝粒染色体,长度介于第2号与第3号染色体之间,比其他已知核型中相应的染色体长,几乎全为异染色质.G带分析表明该对异型染色体的异染色质区域均显示一些数目不等的浅带.本文通过核型分析,对毛冠鹿的性染色体进行了初步的探讨.     

有瓣类二蝇种(Diptera:Sarco-phagidae and Calliphoridae)的细胞遗传学特征

研究了两个有瓣蝇种的细胞遗传学特征。结果表明:棕尾别麻蝇核型为2n=12,8M+2SM+2m,XX/XY,性染色体为微小的点状;C带主要分布于常染色体的着丝粒和次缢痕,性染色体Y普遍深染而X淡染;G带数(2n)为88条。铜绿蝇核型为2n=12,12M,XX/XY;常染色体以中央型C带为主,性染色体呈不同程度的深染;G带数(2n)为107条(雄)或110条(雌)。两蝇种染色体均存在多个随体,C带带型呈分散、杂合、多态或不稳定性。结合有关资料,探讨了有瓣蝇类演化的细胞遗传学机制。     

小黄蝠（Scotophilus temmincki Consobrinus）的核型研究

采用骨髓细胞染色体制片法,G 显带技术,对小黄蝠的染色体进行了核型、G带的观察分析。结果表明:染色体数目,2n=36,染色体臂数 FN=48。常染色体分为4组(10M+4SM+20A),X 是一条很大型的中央着丝粒染色体,Y 是小型的端着丝粒染色体。G 带结果表明:每条染色体都显出特有的 G 带带纹。X 染色体有明显的5条深带。     

草鱼和团头鲂的核型及其C带带型的研究

采用用血淋巴细胞培养制备染色体和BSG 显带枝术,研究了草鱼和团头鲂的核型和C 带带型,草鱼、团头鲂都是2n=48,均有8对中部着丝点染色体,10对亚中着丝点和6对亚端着丝点染色体,它们在核型中除第9对染色体短臂有显著差异外,其余染色体形态很为相似,在C 带带型中,大多数染色体都具着丝点C 带,但它们各有特殊的带型,差异较大,草鱼有两对不同圆颗粒状带型亚中着丝点C 带染色体,并有6对短臂全深染的端位型亚端着丝点C 带染色体,还有两对在短臂C带与随体相联的染色体.团头鲂有的在同源染色体长臂间显示对称和不对称的两种插入型C 带,次缢痕位于第9对染色体短臂上,亦为C 带染色阳性,位于缢痕的裂隙内,无端位带,并对草鱼和团头鲂不同亚科的核型特征以及它们染色体与其物种进化的关系进行了初步讨论.     

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.     

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-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that