紫锥菊的组织培养及其实用快速繁殖

利用植物组织培养技术快速育苗是一个新兴的生物技术应用领域.文中采用组织培养技术,以MS培养基为基本培养基,通过调节植物生长激素的配比对紫锥菊组织进行愈伤化、继代、分化、生根等系列培养,培育出完整植株,并采用声波刺激方式炼苗以提高移栽成活率.该方法避免了传统紫锥菊育苗时种子采集困难,发芽率低,难以大规模育苗的特点,从而为建立规模化培育紫锥菊苗以及为我国开发利用紫锥菊药用资源提供了理论依据.     

紫锥菊中有效成分的分离提取工艺研究

以国外流行的草药紫锥菊为研究对象,以紫锥菊中的有效成分菊苣酸为主要测试标准,应用正交设计实验对紫锥菊中多糖、总酚、菊苣酸3种有效成分进行提取分离及含量分析．从而确定紫锥菊有效成分的分离提取工艺中的较佳工艺参数．     

笋玉米原生质体培养及遗传转化的研究

以自花受粉的笋玉米幼胚为外植体建立了胚性细胞悬浮系,酶解游离原生质体通过液体浅层培养得到了再生植株;通过PEG法和电激法对原生质体进行了遗传转化,转化用外源基因是潮霉素抗性基因和BT基因,原生质体再生愈伤组织经潮霉素筛选后,PEG法和电激法获得抗性愈伤组织的频率分别为9 3%和8.9%,Southem-blotting证明外源基因已整合到玉米抗性愈伤组织细胞基因组中,转基因工程植株的分化工作在正在进行中.     

葡萄原生质体分离和培养的研究

以葡萄花药诱导的胚性愈伤组织为材料,在附加5％纤维素酶(OnozukaR-10)和0.5％蜗牛酶的混和酶液中分离,获得大量具有活力的原生质体.分离的原生质体在附加2mg/L 6—BA和0.5mg/L 2,4—D的改良B_5培养基中进行液体浅层培养,原生质体能再生细胞壁、生长和分裂,形成了较大的细胞团。     

紫外线对玉米(Zea mays L.)原生质体影响的初步研究

酶解墨西哥黑甜玉米的愈伤组织产生的原生质体,经380μW/cm~2紫外线分别照射30 s,60 s,180 s,300 s,发现原生质体的活力及生长与紫外线的剂量有密切关系,随着紫外线剂量的增大,生长及活性趋于降低.辐照30 s的玉米原生质体与对照都可以恢复分裂并长成愈伤组织;辐照60 s的原生质体可以形成小细胞团,未见形成愈伤组织;而辐照180 s和300 s的原生质体都未见细胞分裂.     

灯盏菊(Erigeron breviscapus (vant.) Hand-mazz)单株组培工厂化生产种苗技术研究

筛选了药用植物灯盏菊愈伤组织诱导、增殖及生根培养基配方 ,首次用单一灯盏菊植株外植体进行诱导产生的愈伤组织转移诱导出灯盏菊芽 .完成了该种植物组培苗生根和入土栽培的整套技术研究 ,为灯盏菊的人工栽培和育种提供了一个新的途径 .     

水稻叶肉原生质体的分离与培养

研究了秧龄、纤维素酶浓度、纤维素酶 纤维素酶和果胶酶的比例等因素对分离水稻叶肉原生质体的影响,建立了培养水稻无菌苗、用叶鞘分离水稻叶肉原生质体的方法,该方法解决了愈伤组织诱导困难,分离水稻原生质体的分离期长、费时、费力的问题,大大缩短了分离原生质体的时间,对水稻叶肉原生质体的培养条件也进行了初步的研究。     

影响小麦原生质体培养因素的研究

小麦胚性愈伤组织酶解５小时后，原生质体产率可达６．３×１０６ｇ．ｆｗ－１，酶种类和浓度对小麦原生质体的产率有影响小麦原生质体对不同浓度渗透剂的适应范围较广，在添加０．３ｍｏｌ·Ｌ－１０．７ｍｏｌ·Ｌ－１甘露醇、山梨醇的培养基上，存活率超过５０％所试培养基中，ＫＭ８Ｐ效果最好，实验表明可能与含丰富的附加成分有关除高浓度精胺外，小麦原生质体的存活率随腐胺、精胺浓度的增加而上升，但对原生质体的分裂频率影响不大在上述最佳条件下，小麦原生质体在培养３５天后出现第一次分裂，２０天后统计分裂频率为２５．６％，３个月后植板率为２８％，并形成较多的愈伤组织     

应用大孔吸附树脂吸附分离技术制备菊苣酸的研究

考察了9种大孔吸附树脂对紫锥菊中菊苣酸的吸附分离性能,确定大孔吸附树脂吸附分离菊苣酸的工艺条件。结果表明AB-8树脂对菊苣酸有良好的吸附分离性能,其吸附分离菊苣酸的工艺条件为:质量浓度为3～4mg/mL,pH值为3的菊苣酸原料液以2mL/min的流速上柱吸附,再用6倍量树脂体积 (6BV)的30%乙醇以1mL/min的流速上柱进行解吸。AB-8树脂柱饱和吸附量可达18.0mg/mL,解吸率达90.2%。经AB-8树脂吸附分离,产品纯度达20.2%,纯度比紫锥菊初提物提高了近5倍。     

玉帘的组织和原生质体培养

玉帘不同外植体培养，诱导出胚性、中间型和非胚性３种类型的愈伤组织，并再生植株，由胚性愈伤组织与叶肉细胞分离出原生质体，进行培养，启动了细胞分裂并形成了多细胞团，同时，还研究了影响玉帘组织培养以及原生质体分离和培养的诸因素。     

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