亚精胺、低N素及昼夜温度变化诱导离体黄瓜子叶花芽分化

试验了亚精胺(Spd)与激动素(KT)复合处理、不同的N素及昼夜温度变化对离体黄瓜子叶花芽分化的影响。发现:KT 9.3×10-3mm o l.L-1 Spd5×1-0 2mm o l.L-1有利于花芽的诱导,低N素和昼夜变化促进花器官的构建,进一步完善了离体黄瓜子叶花芽分化的试验体系。     

海菜花ISSR-PCRISSRPCR反应体系的优化

以渐危植物海菜花基因组DNA为研究对象,筛选引物UBC-818【序列为（CA）8G】研究并确定了该引物适宜的退火温度,对影响ISSR扩增效果的主要参数进行筛选和优化,确定了海菜花的ISSR分析的最佳反应体系：15μL反应体系中含25ng模板DNA,0．2mmol·L^-1引物,0．2μmol·L^-1dNTPs,2．0mmol·L^-1Mg^2＋,0．5UTaq酶,1．5μL10×PCRBufferMg2＋（-）[100mmol·L^-1Tris—HCl（pH8．3）,500mmol·L^-1KCl]．     

抗CMV病毒外壳蛋白CP基因导入黄瓜的研究

将CMV－CP基因经农杆菌感染介质转化黄瓜子叶，将CMV－CP基因导入黄瓜细胞，在含有卡那霉素和羧卡青霉素的MS培养基上诱导子叶分子，获得一批转化处理的黄瓜再生苗，分化率为23％左右，转基因黄瓜试管苗移栽在蔬菜种植:沙：有机质为5：4；1的混合土中，其移栽成活率可达56％；委托省农科院品种引进中心进行转基因黄瓜再生植株对CMV的抗性接种试验结果表明：7号株系为高抗，2、4号株系为中抗。     

抗CMV病毒外壳蛋白CP基因导入黄瓜的研究

将CMV-CP基因经农杆菌感染介导转化黄瓜子叶,将CMV-CP基因导入黄瓜细胞,在含有卡那霉素和羧卡青霉素的MS培养基上诱导子叶分化,获得一批转化处理的黄瓜再生苗,分化率为23%左右,转基因黄瓜试管苗移栽在蔬菜种植土沙有机质为541的混合土中,其移栽成活率可达56%;委托省农科院品种引进中心进行转基因黄瓜再生植株对CMV的抗性接种试验结果表明7号株系为高抗,2、4号株系为中抗.     

北野豌豆及其近缘种ISSR反应条件的优化

采用改进的CTAB法,成功地提取了北野豌豆及其近缘种的基因组DNA,电泳结果显示DNA质量和产量均较高,并以此DNA为模板,对ISSR的反应条件进行了优化,最终确定ISSR的反应体系为：总体积10μl,包括10ng的DNA,1倍的反应缓冲液,1．5mmol·L^-1MgCl2,2×10^-4mmol·L^-1（引物6和引物8）或2×10^-3mmol·L^-1（引物5,10和12）引物,0．2mmol·L^-1dNTP混合物和1．0U的Taq DNA聚合酶．ISSR扩增程序为：先在94℃下变性3min,然后在92℃下变性30s,50℃（引物5,6,10,12）或55．2℃（引物8）下复性30s,72℃下延伸1min,反应30个循环,最后72℃延伸5min．并基于此反应条件,最终筛选出5条ISSR引物用于进一步的研究．     

溶胶凝胶法研制药物电极

报道了一种基于溶胶—凝胶技术的新型土霉素电极,详尽地讨论了电极性能的影响因子．该电极具有良好的能斯特响应,平均斜率为64．5mV／decade,线性范围为4．3×10^-6moL／L-1．0×10^-2mol,／L,检测下限为3．4×10^-6mol／L．适宜的pH范围为2．0-5．0．     

植物激素对黄瓜外植体器官分化及植株再生的影响

本文研究了6-BA、IAA、NAA、IBA不同浓度处理对黄瓜外植体器官分化及植株再生的影响.结果表明:6-BA单独处理即可诱导外植体芽分化,浓度为0.5mg/L时分化率最高为33.3%,三种外植体中子叶远轴端无芽分化.IAA、NAA、IBA单独处理均可诱导外植体产生愈伤组织和不定根.两激素配比表明,MS+0.8mg/L 6-BA+0.10mg/L IAA最有利于子叶近轴端分化出芽,MS+0.8mg/L 6-BA+0.15mg/L IAA有利于下胚轴分化出芽,黄瓜植株再生率达30%.     

增敏剂对ITO电极上电聚合鲁米诺电化学发光的影响研究

考察了碱性介质中碘离子、硫离子和双氧水对ITO电极上电聚合鲁米诺修饰膜ECL的影响．在选定条件下,上述物质显著增敏聚鲁米诺的ECL．在1．0×10-6mol／L-8．0×10-6mol／L范围内,电化学发光强度与碘离子浓度有良好的线性关系,r=0．9896;在8．0×10-7mol／L-1．0×10-5mol／L范围内,电化学发光强度与硫离子浓度有良好的线性关系,r=0．9903;在8．0×10-mol／L-6．0×10-5mol／L范围内,电化学发光强度与双氧水浓度有良好的线性关系,r=0．9939．     

涂丝型PVC膜格拉司琼离子选择电极的研制与应用

目的建立盐酸格拉司琼片剂的测定方法。方法以盐酸格拉司琼与四苯硼钠生成缔合物为电活性物,制做涂丝型PVC膜格拉司琼电极。结果在pH4．5-6．5内,电极的Nemst响应范围为1．0×10^-2 - 5．0×10^-5 mol·L^-1,斜率为56．5mV／pc,检测限为2．3×10^-5mol·L^-1。结论用于该药品的含量测定,与高效液相色谱法基本一致。     

溶液pH的计算类型及方法

溶液的pH计算方法就是从定义出发,根据表达式来求pH.计算pH的难点在于找出溶液的氢离子浓度c(H ).下面归类溶液pH的计算类型及方法.一、单一溶液pH值的计算1.强酸溶液例110mL,0.05mol·L-1的H2SO4溶液,pH值为.解析:c(H )=0.05mol·L-1×2=0.1mol·L-1pH=-lgc(H )=-lg0.1=1方法:强酸HnA溶液物质的量浓度为cmol·L-1,则在溶液中c(H )=ncmol·L-1,pH=-lgc(H )=-lgnc2.强碱溶液例220mL,0.1mol·L-1的Ba(OH)2溶液的pH值为.解析:c(OH-)=0.1mol·L-1×2=0.2mol·L-1c(H )=(1×10-14)÷0.2=5×10-14mol·L-1pH=-lgc(H )=-lg5×10-14…     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

库克斯顿城堡

城堡, 是欧洲典型的建筑之一, 每个城堡都有一个美丽的传说或是一段历史。从本期开始, 我们将推出“城堡之旅”, 带各位读者去浏览、观赏欧洲各地的城堡, 开始一段文化与历史的旅途!     

The Reader Response Approach to Teaching of English Literature

During interview with English majors, it was found that a majority of students expressed disappointment with their experience of English literature classes. Students' dislike of learning English literature appears to be the major problem of teaching English literature in China. Reader response approach is a good way to solve this problem. In this paper, I explain the rationale behind the reader response approach, such as its origin, definition, features, assumptions, and strategies. Then I illustrate how reader response approach works as a teaching strategy by presenting several teaching models. At last I evaluate its usefuiness for teachers and present the advantages of reader response approach in Chinese context.