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Taking the stem from three varieties of Dracaena fragrans as a material, the effect of the factors such as the plant growth regulators, the different basal culture medium, silver nitrate, and the cultivation medium upon tissue culture regeneration were investigated.

以3个也门铁品种（金心也门铁、金边也门铁和普通也门铁）茎段为材料，研究了植物生长调节物质、基本培养种类、AgNO3、栽培基质等因素对其离体再生的影响。

The apical buds and axillary buds of Dracaena cambodiana Pierre ex Gagnep. were inoculated on MS medium containing 1 mg/L BA, 0.1 mg/L NAA, 100 mg/L PVP and 30 g/L sucrose for inducing shoots. After cultured for 40~50 d, the shoots bourgeoned. They were then transferred onto MS medium supplemented with 2 mg/L BA, 0.5 mg/L KT and 30 g/L sucrose for inducing clustered buds. After 25~10 d, the clustered buds formed. The proliferation rate of the clustered buds was 300%~500% per month.

以海南龙血树的顶芽和侧芽作为外植体，把其接种于MS+BA 1 mg/L+NAA0.1 mg/L+PVP100 mg/L+蔗糖30 g/L培养基上培养40~50 d可诱导其腋芽萌发，再把萌发后所形成的新芽切割下来接种于MS+BA 2mg/L+KT 0.5 mg/L+蔗糖30 g/L的培养基上培养25~30 d可诱导形成丛生芽，丛生芽在继代培养过程中每25~30 d可增殖3~5倍。

AIM: To explore the inhibitive effects of ectogenesis nitric oxide on the proliferation of neural stem cells in mice. METHODS: NSCs were cultured in medium containing EGF, and the medium was supplemented with SNP as a donor of NO in vitro.

用含表皮生长因子的条件培养基原代培养NSC，在培养基中加入不同浓度的硝普钠作为NO的体外供体。

According to the relation of the heat capacity, the thermal conductivity, the thermal expansion coefficient and the elastic modulus of the laser medium, the distribution and the variation of the temperature and the thermal stress in laser medium were got.

考虑热容值、热导率、热膨胀系数和弹性模量等与温度的关系，得到激光介质的温度分布和变化，以及热应力的分布和变化。

Fundamental equation of earth induced electromagnetic field is deduced,the relationships between electric and magnetic fields in uniform medium and one-dimension layered medium are established respectively,calculation method of earth surface electric field based on geomagnetic storm data is put forward.

3建立了均匀媒质和一维层状媒质中大地感应电磁场模型，提出了基于磁暴数据和大地电性结构参数的地面感应电场计算方法塑料托盘。

Objective To compare serum-free medium AIMV with standard serum-containing medium in culturing IL-2-activated natural killer cells in vitro.Methods Proliferation,cytotoxicity in vitro and expression of CD11 c of the cells cultured in the two different media were compared.To observe the tumor target cells killed by adˉherent natural killer cellsthrough electroscope.

目的 研究方面比较无血清培养基AIMV与完全培养基对体外细胞因子激活的NK细胞的支持作用方法分别用AIMV及完全培养基培养粘附NK细胞和非粘附NK细胞，比较细胞的增殖能力、杀伤肿瘤细胞的能力、表达粘附分子CD11 c 的能力，并通过电镜对A-NK细胞所杀伤的肿瘤细胞进行形态学观察。

This paper introduces the development and classification of the heat pump, the elementary principle, evaluable target and the p-h chart of the mechanism compressive heat pump; It points out the necessity to design the computer program of refrigeration medium"s thermal character, offers the elementary equation, calculating formula, calculating method and the program frame to calculate the refrigeration medium"s thermal character.

本文根据油田生产实际，研究了油田生产中应用热泵的可行性，给出了具体的设计计算方法及热泵技术在大庆采油二厂南十联合站的应用实例。

Furthermore, supplements of callus induction medium under N6 basic medium,such as concentration of 2,4-D, proline and casein hydrolysate were used to study their effects on the induction frequency,embryogeny and quality of callus,the inhibition of embryo spontaneous shooting.

幼胚在附加4 mg/L 2，4-D且去掉水解酪蛋白和L-脯氨酸的N6改良培养基上，幼芽及根的数量少、出愈率高、愈伤组织质地好，并明显减少了幼胚自发性芽分化的趋势，有利于保持愈伤组织胚性、提高再生植株频率，为玉米自交系幼胚诱导的适宜培养基。

The results showed that transformed buds could be obtained after the epicotyl segments were cultured on co-culture medium (MS+3mg/L BA) for 3 days and then on selective medium with 100 mg/L Kanamycin and 500 mg/L Cefotaxime for 2 weeks. The transformation efficency of Sweet orange with the chit42 and phyB genes reached 27.8% and 35.6%, respectively.

上胚轴经农杆菌工程菌液浸染后，在共培培养基(MS+3mg/LBA)上培养3d，然后分别转移到含有100mg/L Kan（卡那霉素，Kanamycin）和500mg/L Cef（头孢噻肟霉素，Cefotaxime）的选择培养基上培养14d后，上胚轴开始分化抗性芽，chit42基因和phyB基因的抗性芽再生率分别为27.8%和35.6%。

Epicycle economy crisis will be washed a lot of more coastal the medium and small businesses that depends on export market badly, but the market space that they take, to at present foreign trade depend on sb or sth for existence spends the mid medium and small businesses such as not tall Zhengzhou, it is opportunity of a development.

本轮经济危机将洗掉沿海很多严重依赖出口市场的中小企业，但是它们留出来的市场空间，对于目前外贸依存度不高的郑州等中部中小企业，是一个发展机会。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。