共查询到20条相似文献,搜索用时 62 毫秒
1.
为阐明蜕皮激素在长角血蜱生殖中的作用机制,测定了雌蜱不同生殖时期体内(果和血淋 蜕皮激素含量和卵巢微粒体Na^+-K^+-ATP酶活力的变化,结果表明,产卵前,蜕 皮甾类含量和酶活力变化不明显,产卵时,则达到最高;产卵后,蜕皮甾类含量和酶活力又下降,外源蜕皮激素(20-羟基蜕皮素酮)处理饱血3d雌蜱有激活酶活力作用,但不表现剂理依赖关系。 相似文献
2.
饱血后1,3,5天的长角血蜱,其卵巢的合神经节的蜕皮激素含量在组织培养前后均没有明显变化;体壁在组织培养后,以酮(E)含量在组织培养前分别增加了14.3和5.2倍;脂肪体单独进行组织培养时,E含量均略有下降,20-羟基蜕皮酮(20-E)均略有上升;脂肪体连同体壁一起培养时20-E比组织培养前分别增加了1.7,2.3和4.7倍,显示了体壁是E的合成分泌部位,脂肪体是E转化为20-E的部位。 相似文献
3.
福州大学学报 《福州大学学报(自然科学版)》1999,27(Z1):1999-104
建立了高灵敏荧光分光光度测定DNA 和RNA 的新方法. 方法的线性范围分别为0-04 ~1-20μg/m L( 鲑鱼精子SMDNA 和小牛胸腺CTDNA) , 0-10 ~1-20μg/mL( 酵母RNA) , 检测限分别为17ng/mL(SMDNA) , 24ng/mL(CTDNA) , 98ng/mL(RNA) . 将方法用于实际样品金黄色葡萄球菌中DNA 含量的测定, 结果满意. 相似文献
4.
为阐明蜕皮激素在长角血蜱生殖中的作用机制,测定了雌蜱不同生殖时期体内(卵巢和血淋巴)蜕皮激素含量和卵巢微粒体Na+-K+-ATP酶活力的变化.结果表明,产卵前,蜕皮甾类含量和酶活力变化不明显;产卵时,则达到最高;产卵后,蜕皮甾类含量和酶活力又下降.外源燃皮激素(20-羟基蜕皮酮)处理饱血3d雌蜱有激活酶活力作用,但不表现剂量依赖关系. 相似文献
5.
陕北红枣叶片中几种生物物质的含量分析 总被引:2,自引:0,他引:2
分析了五个陕北红枣品种(梨枣、骏枣、狗头枣、大木枣、圪土达枣)中糖类(含还原性糖和淀粉)、粗脂肪、蛋白质、核酸(含DNA和RNA)的含量,并对各品种之间的各物质含量进行了比较分析,发现其间存在着较为显著的差异。研究表明,在6月上旬,陕北红枣近顶端新鲜叶片中各成分的含量为:还原性糖0.80-2.50mg/g,淀粉10.00-33.20mg/g,粗脂肪8.4-13.9mg/g,蛋白质25.49-28.27mg/g,DNA0.58-1.35mg/g,RNA4.20-8.96mg/g。此工作为红枣的进一步研究打下了基础。 相似文献
6.
小鼠4.5S RNA逆转座子cDNA的克隆及其表达载体的构建 总被引:2,自引:2,他引:0
利用RT-PCR方法,从小鼠肝脏组织总RNA中扩增出4.5S RNA的cDNA.此cDNA被克隆到pGEM3Zf(+)质粒,酶切鉴定并测序。然后将该序列插入以虫荧光素酶基因作了报导基因的表达载体pSVluc20的PvuⅡ位点,构建;了4.5S RNA逆转座子的表达载体pSVluc20-4.5S,并对4.5S RNA逆转座子的生物学功能进行了研究。 相似文献
7.
石文庆 《萍乡高等专科学校学报》1995,(4):58-61,57
用反相高效液相色谱法分离测定了长角血蜱提取物中的活性物质a-蜕皮激素和β-蜕皮激素的含量。结果表明:长角血蜱成虫血淋巴中的蜕皮激素在产卵前出现了一高峰;卵巢中的蜕皮激素则在饱血后第三天出现高峰;另外,还发现长角血蜱血淋巴、卵巢中的蜕皮激素含量在吸血交配前出现了一个小峰。在卵的发育过程中,蜕皮激素含量一直升高,持续到幼虫孵出。 相似文献
8.
灭幼脲对云斑天牛的不育作用及核酸含量的影响 总被引:3,自引:5,他引:3
用灭幼脲处理的补充营养寄主植物饲养云斑天牛Batocerahorsfieldi(Hope)成虫,对子代卵的孵化有明显抑制作用,生化分析表明:灭幼脲可以促进雌虫卵巢组织DNA,RNA及一日龄卵DNA的合成;对一日龄卵内RNA含量影响不显著,对发育末期胚胎的DNA,RNA有明显抑制作用。结合灭幼脲在世代间垂直传递途径,讨论了灭幼脲对云斑天牛成虫不育作用的机理。 相似文献
9.
抗旱和不抗旱小麦品种在渗透势为-0.025MPa和-0.05MPa PEG溶液中根际胁迫3天和5天,叶片的DNA、RNA含量均呈下降趋势,但抗旱品种73-11下降幅度比敏感品种晋2148小。RNA电泳结果表明:23sRNA、18sRNA、16sRNA以及小分子量RNA的含量均下降,2个品种的下降差异不明显,但在峰形上有区别。DNA电泳结果表明,DNA各组分含量在水分胁迫下也表现为下降趋势,且2个品 相似文献
10.
在pH〈6.2的NaCl介质中,Ce的荧光为核酸所猝灭。20℃时小牛胸腺DNA,鱼精子DNA和酵母RNA对Ce的荧光猝灭在0-6.0μg/ml的浓度范围内符合方程ln(F0/f)=kc+b,在3.0-8.0μg/ml范围内却符合主程F0/F=kc+b。 相似文献
11.
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. 相似文献
12.
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. 相似文献
13.
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。 相似文献
14.
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. 相似文献
15.
Miao Maosheng 《华南师范大学学报(自然科学版)》2014,(6)
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- 相似文献
16.
Yang Weitao 《华南师范大学学报(自然科学版)》2014,46(6):137-138
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- 相似文献
17.
Bernard Kirtman 《华南师范大学学报(自然科学版)》2014,(6)
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 相似文献
18.
《上海师范大学学报(自然科学版)》2014,(5):550
<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with 相似文献
19.
20.
《吉林大学学报(理学版)》2014,(5):1105
<正>"Journal of Jilin University(Science Edition)"is a comprehensive academic journal in the fields of science sponsored by Jilin University and administrated by the Ministry of Education of the Peoples Republic of China.The journal started publication in 1955.The original name at starting publication was"Journal of Natural Science of Northeast People University",which was changed into"Acta Scientiarum Naturalium Universitatis Jilinensis"in 1958 owing to the name change of the university.The present journal name has 相似文献