濒危植物水青树种子的萌发特性研究

对濒危植物水青树种子生物学特性进行了初步研究,探讨了不同温度、不同光照和机械处理对水青树种子萌发的影响．研究发现,水青树种子的千粒重约为0．0719g,种子重量的适合度低;含水量约为7．01％．光照和黑暗条件下水青树种子都能萌发;常温处理光照条件下水青树种子发芽率、发芽势和发芽指数都最高,而4℃和冷冻等低温处理的种子发芽率、发芽势和发芽指数较低;机械处理的种子最先萌发．结果表明,光照对水青树种子的萌发有促进作用,种皮对水青树种子的萌发有一定的限制作用,低温条件下种子萌发能力差可能是水青树濒危的一个重要原因．     

不同温度对木兰种子萌发的影响

本文主要研究了不同温度处理条件对木兰(Magnolia lilifloraDesr)种子萌发的影响,并采用发芽率、发芽势、发芽指数对木兰种子发芽效果进行了评价。结果表明:木兰种子萌发温度幅较宽,在室温18(±2)℃~35℃范围内均能萌发,种子的发芽率、发芽势在不同温度下变化显著。在30℃恒温条件下,种子的发芽率、发芽势最高。因此,木兰种子最佳萌发温度为30℃。发芽率、发芽势、发芽指数在30℃时,分别可达29.4%、29.4%和15.1%。不同温度条件下,经过200mg.L-1GA处理的木兰种子发芽率、发芽势和发芽指数较用清水处理的木兰种子有所提高,说明GA对种子萌发有一定的促进作用。     

不同温度对木兰种子萌发的影响

本文主要研究了不同温度处理条件对木兰（Magnolia liliflora Desr）种子萌发的影响,并采用发芽率、发芽势、发芽指数对木兰种子发芽效果进行了评价。结果表明：木兰种子萌发温度幅较宽,在室温18（±2）℃～35℃范围内均能萌发,种子的发芽率、发芽势在不同温度下变化显著。在30℃恒温条件下,种子的发芽率、发芽势最高。因此,木兰种子最佳萌发温度为30℃。发芽率、发芽势、发芽指数在30℃时,分别可达29．4％、29．4％和15．1％。不同温度条件下,经过200mg·L^-1CA处理的木兰种子发芽率、发芽势和发芽指数较用清水处理的木兰种子有所提高,说明GA对种子萌发有一定的促进作用。     

当归种子活力

采用不同光照、不同温度和不同消毒处理,对4种当归种子从发芽率、发芽势、发芽指数和活力指数等指标上进行实验.结果表明:在暗培养箱25℃恒温下能明显提高当归种子发芽率;当年的当归种子发芽率明显高于存放1年的;提前抽薹种子的发芽率高于正常种子的;50℃水浴和0.2%高锰酸钾处理在降低当归种子霉变污染的同时,也显著抑制了其发芽率和发芽势.     

茜草种子萌发特性的研究

为了解茜草种子的特性,探讨温度、光照等条件对茜草种子萌发的影响,观测了茜草种子的形态、千粒质量、水分含量、吸水率,测定了茜草种子在不同温度条件(15,20,25℃)下,黑暗和光照条件下的发芽率、发芽势.结果表明,室温下茜草种子吸水率在36h达到饱和,为161%;茜草种子在20℃条件下萌发率最高为69%;光照和黑暗条件下茜草种子发芽率和发芽势无显著差异,但在黑暗条件下可以缩短茜草种子的发芽时间.     

海巴戟的种子结构及发芽试验

对海巴戟种子的形态和结构进行了观察研究,并从环境温度、播种基质、物理处理等方面,探讨了其种子的萌发特性及生理.试验结果表明:海巴戟种子的萌发特性与其结构特点有关;高温能显著提高其种子的发芽率、发芽势和发芽指数,且高温条件下变温更有利于种子的萌发,最适宜的发芽温度是28~35℃,28℃和33℃则是发芽的最佳变温;海巴戟种子本身存在着某种抑制萌发的特殊物质,但在土壤中这种拟制萌发的状态可被打破而诱导萌发;透气和保水性能良好的播种基质对海巴戟种子的萌发有利,以河沙加泥炭土作为播种基质的海巴戟种子,发芽率最高,达77.0%,其相应的发芽势和发芽指数也最高,分别为63.5%和12.532;温水处理对海巴戟种子的萌发具有明显的促进作用,能提高它的出苗整齐度,且其发芽率和发芽势均最高,分别达74.0%和62.5%,其相应的发芽指数为12.271.     

温度和光照对长春花种子萌发和幼苗生长的影响

长春花是重要的观赏和药用植物.为了探索适宜长春花种子萌发及幼苗生长的温度和光照条件,研究了温度(20℃、24℃、28℃和30℃)和光照条件(每日连续光照14h和全黑暗)对经自来水浸种24h后的长春花种子发芽和幼苗生长的影响.结果表明,种子的发芽率和发芽指数、幼苗的芽长和干重均受光照条件、温度以及两者间交互作用的显著影响(P0.01),种子的发芽势、幼苗的鲜重受光照条件以及光照条件和温度间交互作用的显著影响(P0.01),幼苗的根长仅受温度的显著影响(P0.01).各光照和温度条件组合间,种子在黑暗、20℃-28℃下的发芽率和发芽势均最高,在黑暗、24℃和28℃下的发芽指数最高;幼苗的根在光照和28℃以及黑暗和24℃下较长,芽在黑暗、24℃-30℃下最长,鲜重在光照和24℃以及黑暗和20℃-30℃下最大,干重在光照、24℃下最大.黑暗、24℃是长春花种子萌发和幼苗生长的最适条件.     

黑果枸杞种子发芽试验

分别采用不同温度的蒸馏水、不同浓度的吲哚丁酸（IBA）、0.5％ NaCl和不同时间浓H2SO4处理黑果枸杞种子,刺激种子发芽.结果表明,经浓H2SO4腐蚀种皮,可缩短发芽时间,提高发芽率、发芽势,其中3min处理的发芽效果最好.不同浓度IBA和0.5％ NaCl溶液、低温（20℃）或高温（60℃）水浸泡种子,发芽率、发芽势、平均发芽时间比对照低,发芽指数没有大的差异,说明抑制了种子发芽,最差为20℃水浸泡种子.     

不同温度对夏枯草种子发芽的影响

设置5种温度对夏枯草种子进行发芽试验,根据不同温度下的发芽率、发芽势、最初萌发时间等指标,探讨夏枯草种子发芽的最适温度．结果表明,温度对夏枯草种子的发芽率、发芽势、发芽指数有显著影响,种子的发芽最初萌发时间随温度的升高先缩短而后又延长,发芽势在21℃培养温度下达最高值为39．0％,夏枯草种子发芽最适温度为21℃．     

温度和PEG浓度对金荞麦种子萌发的效应

研究了不同发芽温度和PEG浓度对金荞麦种子发芽的影响,主要测定了发芽势、发芽率和发芽指数三项重要指标。结果表明,不同发芽温度对金荞麦种子以上三项指标的影响均达到了显著差异,不同PEG浓度对金荞麦种子发芽率的影响达到了显著差异,而对发芽势和发芽指数没有显著差异。其中发芽温度15℃和5%的PEG浓度是金荞麦种子发芽的较适宜温度和PEG浓度。     

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