番木瓜胚珠高频率体胚发生和植株再生

将番木瓜(Carica papaya L.)受精胚珠接种于MS IAA1mg/L BA2mg/L GA_3 2mg/L S(蔗糖)3％和1/2MS 谷胺酰胺400Mg/L CW(椰子汁)20％ S6％的培养基中,诱导愈伤组织,愈伤组织继代培养于MS CW 2％ S6％ 2.4-D 2mg/L的培养基上。进行了几种激素配比和基本培养基(MS和改良MS)对诱导胚性愈伤组织、体胚发生和植物再生培养基的比较实验。结果表明:在改良MS 硫酸腺嘌呤160mg/L NAA 1mg/L BA 0.5mg/L GA_3 1mg/L S4％培养基中获得理想胚性愈伤组织和体胚,在改良MS 硫酸腺嘌呤160mg/L NAA 1mg/L KT 0.5mg/L GA_3 1mg/L S4％产生正常具三裂片和根系的小植株。进行番木瓜体胚包埋、制成人工种子,实验获得小苗,并移栽成功。     

芥菜原生质体培养和胚性愈伤组织的产生

以芥莱无菌苗下胚轴为材料游离获得原生质体,原生质体培养于含NAA1.5mg/l,6-BA0.6mg/l、和2.4-D0.5mg/l的DPD液体培养基中,约4—5周形成肉眼可见的小愈伤组织。转入MS固体培养基后,即可产生大量的愈伤组织,其中胚性愈伤组织约占50%以上。     

前胡组织培养和细胞悬浮培养中胚状体发生及植株再生

前胡的种子幼苗切段在含有1mg/l2,4-D的(1/2)MS 固体培养基(大量元素减半)上,诱导产生愈伤组织。诱导两个半月的愈伤组织,在含有1mg/l6-BA+0.5mg/lIBA 或无激素的(1/2)MS 固体培养基上,分化出胚状体,再生成完整植株。愈伤组织在液体培养基中振荡分散及过滤制备成悬浮培养物,在含1mg/l2,4-D的液体培养基中,胚性细胞不断增殖。转移至含有0.05mg/l 2,4-D+0.05mg/l 6-BA 的(1/2)MS 液体培养基中,分化出胚状体,发育成完整植株。     

木槿愈伤组织继代培养在不同培养基上的变化

木槿下胚轴在MS附加2,4-D(0.5mg/l)、激动素(0.1mg/l)和3％蔗糖的培养基(MS_1)上诱导出愈伤组织。将愈伤组织分别转移到不同培养基上,在特定培养基上可以发生根、芽和体细胞胚,并萌发成苗。组织切片观察了胚和器官的形态建成。最后,文中就激素、蔗糖浓度以及愈伤组织类型对形态建成的影响作了讨论。     

籼粳稻成熟胚愈伤组织培养力的比较

以中籼品种扬稻6号和粳稻9908为实验材料,研究不同品种成熟胚（种子）愈伤组织的培养力．结果表明：以M8为基本培养基,激素配比为1mg／L 2,4-D、2mg／L ABA、2mg／L 6-BA的培养基可以使扬稻6号的成愈率达到90．5％;激素配比为1mg／L 2,4-D的培养基可以使9908的成愈率达到88．2％;以M8为基本继代培养基,激素配比为2mg／L 2,4-D、1mg／L ABA的培养基可以使扬稻6号和9908的愈伤组织的继代率分别为71．6％和87．5％：以MS为基本培养基,激素配比为0．2mg／L 2,4-D、2mg／L 6-BA、2mg／L KT的培养基使扬稻6号和粳稻9908愈伤组织的植株再生分别达到65．4％％和62．7％,建立了扬稻6号和9908稳定高效的组织培养再生体系．     

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。     

水仙胚性愈伤的获得及农杆菌介导GUS基因的遗传转化

用正交实验设计对前期影响水仙胚性愈伤诱导和分化关联性大的因素进行综合分析,结果显示,培养基类型、激素及处理方式、不同添加物等对水仙外植体胚性愈伤诱导及分化的影响是基于培养基的多因素协同效应。水仙适宜胚性愈伤诱导培养基是:改良MB+NAA(0.2 mg/L)+6BA(2 mg/L)+ABA (2 mg/L)+AgNO3(5 mg/L);适宜的分化培养基是：改良N6+2,4D(0.5 mg/L)+6BA(2.5 mg/L)+NAA(0.2 mg/L)+ABA(2 mg/L)。实验中观察到水仙体细胞胚的发生,在胚性愈伤诱导和分化体系优化基础上实现农杆菌介导GUS基因转化,稳定表达抗性愈伤GUS染色显示最佳胚性愈伤诱导培养基能促进水仙外植体感受态的形成,有利于外源基因的接受,PCR检测表明实验中获得3株转GUS基因阳性植株。     

甜瓜原生质体培养及胚状体发生的初步探讨

以甜瓜无菌苗子叶为供试材料游离原生质体,原生质体在1/2MS培养基附加2,4-D1.0mg/L、6—BA0.5mg/L中做液体浅层培养。4～5天细胞第1次分裂,两周后形成小细胞团,添加低渗培养基继续培养,产生大量愈伤组织和部分胚状体。     

由云南松(Pinus yunnanensis Franch.)小孢子叶诱导愈伤组织的初步研究

本文报道了以MS和N_6为基本培养基,分别添加不同种类和数量的附加物,培养云南松幼小的小孢子叶而获得愈伤组织和胚性细胞团的情况。MS为基本培养基较N_6为好,其中以MS分别附加2mg/ι 2,4-D;2mg/ι 2,4-D+2mg/ι KT或2mg/ι 2,4-D+0.5mg/ι KT+0.5mg/ι NAA效果最好,诱导率均达2％以上。将愈伤组织转入不含激素或含不同种类和数量激素等附加物的MS培养基上进行处理,除成活率有明显区别外,其它变化不大。经细胞学和组织学初步观察,愈伤组织的染色体数有24或近于24者,但也有近于12者,云南松与其变种地盘松的诱导率无明显区别。     

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     

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