井冈山国家级自然保护区蛇类资源

2002～2005年对井冈山国家级自然保护区的蛇类进行了调查,发现当地2种新记录,银环蛇(Bungarus multicinctus)和短尾蝮(Agkistrodon brevicaudus).结合文献记录,井冈山自然保护区共有蛇类33种,隶属于3科21属,其中有9种被列入《中国濒危动物红皮书》.井冈山自然保护区蛇类资源非常丰富,具有药用、食用、灭鼠(虫)、制革和观赏等方面的价值.     

陕西蛇类新纪录

陕西省蛇类区系调查资料曾被黄洪富等(1965)、胡淑琴等(1966)、方荣盛等(1981)发表过。他们查阅了Pope(1935)、Pope & Boring(1940)发表过的陕西蛇类调查资料,总结了陕西省境内的蛇类种类,共计有24种。西北大学生物系于1957年4月、1959年6月间,曾在南郑、宁陕、岚皋县采到蛇类标     

话蛇

蛇类是爬行动物最后进化而形成的一支,起源于原始蜥蜴类。蛇类化石最早发现在白垩纪早期的地层中,但实际蛇类在地球上出现较此要早,约在一亿三千万年左右的中生代。现今生活的蛇类有11科、约400属、2700种。中国产的蛇类已知8科、53属、224种(其中毒蛇近50种),主要分布在长江以南各省(自治区),尤以广东、广西、云南、福建、贵州等省(自治区)为多。     

中国蛇类保护和利用概述:历史、现状和未来

中国是世界上蛇类最为丰富的国家之一,也是蛇类资源利用的主要国家之一,中国蛇类的保护和利用历来受到国际机构和组织的关注。中国现有蛇类241种,其中30余种是很重要的资源动物,野外资源利用量巨大。随着环境污染、栖息地丧失和破碎化,以及过度利用,蛇类资源处于衰减之中,有数十种处于极度濒危和濒危状态,其中莽山烙铁头蛇(Protobrothropsmangshanensis)野外种群远小于大熊猫。为了保护和可持续利用这些珍贵资源,笔者概述了中国蛇类保护和利用的历史和现状,重点对中国蛇类养殖和贸易进行了汇总。最后,结合具有中国特色的社会主义生态文明建设,对今后的保护和可持续利用管理与研究进行了讨论。     

眼镜蛇血液凝固机理研究(眼镜蛇科)

Fantl(1961)、Hackett 等(1987)、Lavras 等(1979)和 Nachas(1981)分别在虎蛇(Notechis)、美洲矛头蝮(Bothrops jararaca)和 Waglerophis merremii 进行血凝机理的研究。他们一致认为蛇类凝血的过程比哺乳动物凝血的过程缓慢。但对引起蛇类血疑过程缓慢的原因结论却不一致。Fantl 和 Lavras 认为虎蛇和美洲矛头蝮血凝过程慢的原因是这两种蛇的血浆中都缺乏因子Ⅻ。Fantl 认为虎蛇血凝过程慢的另一个原因是由     

河南鸡公山自然保护区蛇类资源调查

从2000年至2003年对鸡公山自然保护区的蛇类资源进行了调查，共发现蛇类25种．其中有毒蛇5种．无毒蛇20种．调查结果表明．鸡公山境内的蛇类种类和种群数量有增加的趋势。     

蛇类不同季节的不同管理

蛇类的活动时间全年共8个月,即春末至冬初(4—11月)。随着季节的变化,对蛇类分别不同的管理至关重要。①春季收购养殖种蛇,一般以清明前后最为适宜,运输途中温度不太冷也不太热,养殖期不久便可进入产卵或产仔时期。因此,     

昆明地区的蛇类

作者于1957—1981年对昆明地区的蛇类作了查调,共得标本160号16种,加上原有记录,昆明共有三科11属19种。该地区蛇类区系的主要特点是东洋界种类占绝对优势,19种中有18种,占种数94.7％,仅黑眉锦蛇1种广布于我国古北和东洋两界,占5.3％;另一特点是西南区的特有种类(或主要产于西南区的种类)较多,有4种,占东洋界种类的22.2％。八线游蛇和紫灰锦蛇是皆地区蛇类的优势种。昆明蛇类冬眠期为11月—翌年3月底4月初。对133号标本作了胃的食物分析,八线游蛇、紫灰锦蛇、斜鳞蛇、草游蛇和乌游蛇五种72号标本中胃内有食物。蛙是它们共同的食物,也是昆明蛇类主要食物之一。八线游蛇的性比为38(?):34(?)=100(?):89.5(?);斜鳞蛇为7(?):9(?)=100(?):128.6(?);紫灰锦蛇为25(?):6(?)=100(?):24(?)。昆明地区蛇的繁殖多在5—9月。八线游蛇怀卵数为7—16枚,斜鳞蛇为8—15枚,竹叶青每胎3仔。     

蛇类保护迫在眉睫

蛇类是动物在长期演化过程中形成的爬行动物的一支,是历经1.3亿年的漫长岁月进化而来的特殊类群。我国是蛇类资源较为丰富的国家,据统计,已知蛇类8科64属209种,约占世界3000种蛇类的7％。我国对蛇的利用历史悠久,蛇在我国传统饮食文化和中医药生产中一直占有相当重要的地位。尤其是随着我国     

眼镜蛇血细胞的形态与分类

有关蛇类血细胞类型的资料较少,尤其对白细胞的分类和形态,不仅文字描述少,图样不全,而且分类也不一致。1962年Pienaar将南非几种蛇类血液中的白细胞分为淋巴、单核,嗜酸、嗜碱、嗜天青、嗜中粒细胞和浆细胞七种。1963年和1967年Duguy将蛇类的白细胞分为淋巴、单核嗜酸、嗜碱和嗜中粒细胞五种。为了明确眼镜蛇血细胞的分类,作者对眼镜蛇各种血细胞进行形态的观察与描述。     

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