陕西地区桃花水母的发现及描述

通过对陕西地区发现的桃花水母进行形态学特征的初步探讨,得到的形态学特征为:生殖腺呈扁囊状,淡黄绿色;触手分为3级,主触手比其他两级长;平衡囊管型,数量在132～184之间;刺丝囊疣为乳突状,各环状疣间有明显间隔,似分节状,这些特征与已报道的有差异;并对得到的可量化数据进行了统计分析,结果显示伞径与触手及伞径与缘膜的关系均呈显著正相关性,伞径与平衡囊相关性不大.     

水母

水母是地球上最古老的原始生物,至今大约已有30亿年的历史。水母身体的结构简单,只有两个胚层,没有头脑,没有心脏,没有骨骼,只有胃。透明伞下的中央是嘴,边缘是触手,触手里有刺丝胞。捕猎时,它们用刺丝胞便扎进猎物体内,注入毒素,麻痹猎物。水母形体美观,漂浮生活,其运动姿态飘逸,十分美丽。运动时靠着伞部的伸缩,将伞部下面的水向外推出,水母体便依靠水的反作用向前推进。伞部倒向下时,便能向水的下层快速降落。薄而柔软的缘膜徐徐扇动,拖着长长的触手,在黄昏日落或天刚发亮时,大量飘浮于水面,在水中间显出青白的颜色,形成美丽的景观。全世…     

我国淡水水母一新种

1993年4月2日在湖北省秭归县归州镇采用淡水水母标本19个,形态结构与Craspedacusta sinensis相似,但刺丝囊疣低圆锥状,排列不规则;生殖腺囊状,大,褶皱,绿色。这些特征与C.sinensis有着明显区别。     

我国水螅水母一新记录

<正> 我们获得1983年采自福建闽河口梅花的4个水媳水母标本,经鉴定为向心管水母(Maeotias inexpecfata)。此水母为河口种类,是Ostroumoff于1896年建立的一个新属新种,属花笠水母科(Olindiadidae),标本采自亚速海的顿河及库班河口。Mayer曾于1910年记述过:Borcea 1928年报道在黑海发现;Kramp于1959和1961年作了特征简述。福建梅花的向心管水母发现,为我国及太平洋的首次记录。简要描记于下: 向心管水母(Maeotias inexpectata Ostroumoff 1896) 伞半球形,直径27-33毫米,高11-13毫米。胃无柄,口唇长大,对折成披针形,伸达缘膜孔之外。唇片边缘有缺刻,且有一行圆形的刺丝囊丛。缘膜宽,约为伞径的1/4-     

台湾海峡单肢水母属二新种(丝螅水母目,高手水母科)

记述了采自台湾海峡的花水母亚纲(Anthomedusae Haeckel,1879),丝螅水母目(Filifera Kühn,1913),高手水母科(Bougainvillidae Lütken,1850),单肢水母属(Nubiella Bouillon,1980)二新种,即粗管单肢水母,新种(N.crassocanalis sp.nov.)和母芽单肢水母,新种(N.medusifera sp,nov.).其鉴别特征如下:1)粗管单肢水母,新种,伞钟形,无顶突,外伞上有分散的刺细胞;垂管短,无胃柄和口管;4个大的生殖腺,间辐位;口简单环状,从口缘上部伸出8条不分枝的口触手;4条辐管粗,边缘不规则;4个缘触手基部近梨形,每个基球背轴有1个内胚层棕红色致密块,并向辐管有1短的突起,4条具有环状刺胞的单生触手;外伞主辐位伞缘有4个囊状刺胞囊,有短管和触手基球连接;2)母芽单肢水母,新种,伞钟形,无顶突;无胃柄,垂管发达;生殖腺环绕在垂管上,在垂管上方有许多水母芽;口管宽大,口环状,在口缘上方有10条不分枝的口触手;4条较细辐管;4条主辐位缘触手,触手基球长锥形,4个外伞刺胞囊,直接和触手基球相连.     

北极露水母

生活在大西洋和北冰洋里的北极露水母，是目前发现的最大水母。 游动时，它的伞盖直径可达2．5米，伞盖边缘伸出的触手可达1200根，每根触手上都有含毒的刺丝。     

广西沿海真唇水母属一新种

记述来自广西沿海真唇水母属(Eucheilota McCrady,1859)一新种--双手真唇水母(Eucheilota bitentaculata Huang,Li et Zhong sp. nov.).其鉴别特征如下:伞钟罩形,胶质薄;垂管短,口方形;生殖腺在辐管中部,肾形,当中充满卵细胞;4条辐管,1条环管;缘触手2条,相对排列,另2个相对的主辐缘疣,触手和主辐缘疣均有3对侧丝,4个间辐位缘疣无侧丝,触手和缘疣均无黑色素;8个平衡囊.还讨论真唇水母有效种及本新种与近似种的区别,同时提供中国海域真唇水母属已知有效种的检索表.模式种保存于厦门大学海洋与环境学院.     

桃花水母形态结构观察及诱发环境因素探究

利用显微镜观察桃花水母结构,针对桃花水母的触手、平衡囊、平衡石、生殖腺和食性,拍摄大量图片和视频;制作浸泡标本;针对校园两个不同池塘（水母发生池）和（星海池）作为实验组和对照组,从周围环境、水体（颜色、可见度、光照、水温、PH值、溶解氧、浮游生物）等方面进行调查、实验和对照比较分析,探索桃花水母最适合的生存环境条件。研究中,我们拍摄了大量桃花水母的图片和视频,弥补了目前相关资料的不足,对人们认识、了解、研究这种珍稀物种提供一定参考价值。发现了华英学校水母池桃花水母的生物特征、喜欢富营养化环境,发现我校桃花水母体内含有一特殊浮游生物—车轮虫,国内未曾报道。针对桃花水母分类和保护提出自己看法。     

世界上最大的水母

生活在大西洋和北冰洋的露水母,是目前世界上发现的最大的水母。它们有的呈红褐色,有的呈黄色,在游动时伞盖直径可达2．5米。露水母伞盖边缘伸出的触手可     

台湾海峡及其邻近海域软水母亚纲二新种记述

记述了采自台湾海峡侧丝水母属(Helgicirrha Hartlaub,1909)——卵形侧丝水母,新种(H.ovalis sp.nov.)和采自邻近海域厦门同安湾似杯水母属(Phialella Brown,1902)——厦门似杯水母,新种(P.xiamenensis sp.nov.).这2种鉴别特征如下:卵形侧丝水母,新种,伞扁于半球形,伞薄;胃柄短;生殖腺卵圆形,位于辐管近中部;8条触手,每条触手有3对侧丝,无排泄乳突;每2条触手间1～2个缘疣,各具1对侧丝,其末端有黑色素.厦门似杯水母,新种,伞扁于半球形,伞薄;胃小,口方形;生殖腺球形或椭圆形,悬挂于辐管近伞缘,有中沟;16条空心触手,触手基部球形;8个平衡囊,在伞缘环管垫状疣突上.     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

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.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

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-