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1.
采用胞壁水解酶(Driselase2mg·L-1)和甲醇(-20℃),分别对卵菌(Saprolegniaferax)菌丝细胞壁及细胞膜进行通透,然后用免疫组织化学法对菌丝钙调素(CaM)的分布进行定位.结果表明CaM较密集地分布在菌丝顶端和在菌丝旁侧新形成的侧枝,亚顶端次之,基部菌丝几乎无特异性染色.由此提示,CaM可能参与卵菌菌丝顶端生长的调控.  相似文献   

2.
利用钙调素拮抗剂三氟拉素(TFP)及微管的不同聚合状态对Hela细胞微细及波形纤维白分布的影响进行了。Hela细胞微丝明显解聚,而波形纤维蛋白则密集分布在细胞一侧。细胞经TFP处理2d后,可见微丝分布的恢复,而波形纤维蛋白分布则变得分散,并向质膜延伸,但对TFP处理2d后的细胞用低温(2-4℃)处理,使微管解聚,或以紫杉酚处理24h,使微管高度聚集以破坏其微客网络系统时,微丝则随之发生明显的解聚现  相似文献   

3.
利用钙调素拮抗剂三氟拉嗪(TFP)及微管的不同聚合状态对Hela细胞微丝及波形纤维蛋白分布的影响进行了研究。Hela细胞微丝明显解聚,而波形纤维蛋白则密集分布在细胞核一侧。细胞经TFP处理2d后,可见微丝分布的恢复,而波形纤维蛋白分布则变得分散,并向质膜延伸。但对TFP处理2d后的细胞用低温(2~4℃)处理,使微管解聚,或以紫杉酚(taxol)处理24h,使微管高度聚集以破坏其微管网络系统时,微丝则随之发生明显的解聚现象,而波形纤维蛋白又恢复为密集分布于细胞核一侧的状态。若在低温处理前加taxol预处理1.5h,以稳定微管时,此时在细胞周边仍可见微丝存在,波形纤维蛋白仍保持其分散分布状态。结果表明经TFP处理的Hela细胞微丝及波形纤维蛋白分布的变化可能与微管分布的改变具有一定的联系。  相似文献   

4.
将荧光活性物质2(4二苯基)6苯基苯并恶唑(PBBO)固定在增塑的PVC膜中,研究水溶液中黄连素对PBBO的猝灭机理.结果表明,该体系存在静态猝灭和内滤效应两种猝灭机理.推导了黄连素浓度与F0/F(膜荧光强度/猝灭剂存在下膜荧光强度)之间的数学表达式,实验结果与推导的理论公式相符.  相似文献   

5.
合成了Tb(DPSO)6·(ClO4)3、Tb(DPSO)7·(PF)及Tb(PBSO)6·(ClO4)3配合物(DPSO为二苯基亚砜PBSO为苯丁基亚砜)。在室温下测定了它们的固体粉末荧光激发和发射光谱,结果表明Tb(DPSO)6·(ClO4)3配合物中Tb^3+的发光强度最高,其中^5D4→^7F5跃迁谱带强度高达806.2cd,Tb(DPSO)7(PF6)3配合物中Tb^3+发光强度次之,T  相似文献   

6.
本文研究了pH=4.5、摩尔比在1:1~1:4时,高氯酸镨与谷氨酸/苦杏仁酸/青霉胺水溶液的吸收光谱,并由此计算了Pr3+的电子排斥和Land参数(Fk(2,4,6)和ζ4f),键合参数(β,b1/2,δ)和Judd-Ofelt参数(Tλ(2.4.6)),并由这些参数的变化和数值指出在溶液中Pr3+和配体主要以外圈配位。Judd-Ofelt参数T6和3H4→3P2跃迁强度相关,T4与3H4→3P0跃迁强度相关。  相似文献   

7.
合成了铕(Ⅲ)与氯甲基化交联聚苯乙烯担载1,4,8,11-四氮杂环十四烷(PTACT)和噻吩甲酰三氟丙酮(TTA)的混配配合物(PTACT-Eu-TTA),采用元素分析、红外光谱、ICP及XPS对其结构进行了表征.其荧光性能分析表明,高分子混配配合物在室温下具有很强的荧光.  相似文献   

8.
用改良的Adler-longO方法合成了若干卟啉配体,得到铰高的收率,所合成的卟啉及所得产率分别为(1)TPP27.3%;(2)T(3,4,5-3MeO-P)P30.4%,(3)T(4—Me—P)P23.9%,(4)T(3,5—2Me)P22%;(5)T(4-Cl-P)P29.8%,合成反应在低于丙酸的回流温度下进行.  相似文献   

9.
脱落酸可以提高柑桔原生质体抗冻力,而钙离子专一性螯合剂EGTA(乙二醇双乙胺醚-N,N‘-四乙酸)和钙调素拮抗剂TFP(三氟拉嗪)则抑制低温锻炼过程中柑桔原生质体抗冻力的发展。ABA提高柑桔原生质体抗冻力的作用被EGTA和TFP所抑制,结果表明ABA提高原生质体抗体力的作用受钙信使系统的调节。  相似文献   

10.
通过检测小鼠脾脏PFC,CD+4/CD+8T淋巴细胞亚群比值、淋巴细胞转化活性及脾细胞产生肿瘤坏死因子(TNF)等免疫指标,观察三普虫草精(SPCS)对环磷酰胺(CY)损伤小鼠免疫功能的影响。发现SPCS在有效剂量范围内单独使用,能促进CY损伤小鼠PFC功能的恢复(P<0.01);使因CY损伤而失调的CD+4/CD+8T淋巴细胞亚群比值得到改善(P<0.05);使降低了的淋巴细胞转化活性得以恢复(P<0.001);能显著促进ConA诱导CY损伤小鼠脾细胞TNFβ的合成与释放(P<0.001)。  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.
何延凌 《科技信息》2008,(4):258-258
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.
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.
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.
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.
For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the  相似文献   

19.
<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   

20.
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