荧光光谱法研究黄豆苷原与牛血清白蛋白的相互作用     

宋胜梅  罗小芹  徐茂田 《商丘师范学院学报》2011,27(3):58-62

用荧光光谱法在pH7.4的PBS中研究了黄豆苷原（Daidzein,Da）与牛血清白蛋白（bovine serum albu-min,BSA）的相互作用.结果表明Da可静态猝灭BSA的内源荧光,温度升高时受动态猝灭的影响变得明显.二者之间的结合位点数约为1.5,315 K、310 K,300 K和290 K时的表观结合常数分别为5.44×104L.mol-1,5.70×104L.mol-1,5.29×104L.mol-1和5.69×104L.mol-1.焓变为0.2969 kJ.mol-1,熵变为91.78为J.mol-1.K-1,各温度下的自由能变均小于零,热力学参数表明二者之间主要靠静电力发生作用,熵变对反应过程具有较大贡献,且反应是自发过程.同步荧光光谱表明Da的加入改变了BSA的构像,使色氨酸残基的微环境亲水性增强.本研究对于阐明Da与蛋白的相互作用机理具有借鉴意义.  相似文献   

核素分布的8×8核素区域     

王昱应  郝巧 《商丘师范学院学报》2011,(12):36-38

在氘氚结团图中说明了4个8×8核素的分布区,每区包含64核素坐标,其中包括1,2个放射核素.4个区域的中心为（352,4）（35,26）（33,23）（31,16）.区域中的5个放射核素联系有146 62 40Sm84 72与132 58 30Ce76 28处于对称位置,放射核素中的146 62 40Sm84 22与212 84 40Po128 44的坐标S值相同,坐标H倍增联系.  相似文献   

共振的研究及应用   总被引：1，自引：0，他引：1  

苏晓琴  姜其畅  苏艳丽  王小平 《运城学院学报》2011,29(2):24-29

通过对机械振动中共振现象及其理论的阐述,加深对共振概念以及共振产生的条件的认识,并对生活中的一些共振现象进行分析与研究,以使人们利用共振的有利之处,并及时避免有害的共振。  相似文献   

以共鸣理论看杜牧对柳宗元的接受     

陈如毅 《江苏广播电视大学学报》2011,22(2):49-52

杜牧在晚唐柳宗元的接受处于低谷的时候,唱出了＂李杜泛浩浩,韩柳摩苍苍＂的诗句。共鸣理论认为,当接受主体与接受对象的审美契合度越高时,共鸣效应越大,文学接受越易发生。由于杜牧在自身气质、政治热情、文学创作及情感经历上与柳宗元存在高度的契合,所以也对柳宗元诗文的共鸣要多于他人。这是杜牧欣赏接受柳宗元不可忽视的内在原因。  相似文献   

一类新超混沌系统及其自同步   总被引：2，自引：0，他引：2  

高智中 《常熟理工学院学报》2011,25(8):31-34

基于一个三维混沌系统构造了一个新的四维超混沌系统,利用系统的分岔图、Lyapunov指数谱图和相图分析方法研究了该系统的运动规律．根据线性系统稳定性定理,设计了一种非线性反馈控制器,实现了该超混沌系统的自同步,数值模拟结果验证了理论分析的正确性．  相似文献   

取代基酞菁铜的合成与表征     

夏道成  姚纪欢  韩双  马会宣  刘慧景 《雁北师范学院学报》2011,27(2)

首先以3,6-二羟基邻苯二甲腈和氯代正丁烷为起始反应物,在无水碳酸钾的催化作用下,经亲核取代反应,在DMF（N,N-二甲基甲酰胺）溶剂中合成了中间配体3,6-二丁氧基邻苯二腈,再以此配体和氯化亚铜为前体,采用DBU液相催化法合成了周边烷氧基取代的1,4,8,11,15,18,22,25-八丁氧基酞菁铜,经过元素分析、红外、荧光、紫外可见光谱和原子吸收表征证明,产物就是目标化合物取代基酞菁铜。  相似文献   

Getting good at small talk: student-directed learning of social conversation skills     

Veerle Garrels 《欧洲特需教育杂志》2019,34(3):393-402

For students with autism spectrum disorders (ASD), learning social skills is an intricate but essential task to facilitate social inclusion and participation. Limited research is available on social skills interventions for adolescents with ASD and intellectual disabilities (ID). This article presents a case study that illustrates how the Self-Determined Learning Model of Instruction was used to improve self-chosen social conversation skills in a Norwegian 14-year old student with ASD and mild ID. This case study illustrates that, also for students with ASD and ID, giving them the opportunity to set personally relevant goals may improve their autonomous motivation, thereby increasing the likelihood of goal attainment.  相似文献   

噪声环境中基于DTW的说话人识别     

张飞云  张鹏  高建生 《许昌学院学报》2011,30(5):68-72

在VC++环境下,提取PLAR特征参数,基于听觉特性和语谱特性的语音增强器作为预处理器,对语音信号首先进行降噪处理,建立了基于DTW的抗噪声说话人识别系统.实验结果表明,即使在信噪比比较低的情况下,该系统都会在一定程度上提高多种噪声环境下说话人识别系统的识别性能.  相似文献   

Anisotropic fluoride nanocrystals modulated by facet-specific passivation and their disordered surfaces     

Ziyu Yang  Huihui Zhang  Junjie Xu  Renzhi Ma  Takayoshi Sasaki  Yu-Jia Zeng  Shuangchen Ruan  Yanglong Hou 《国家科学评论(英文版)》2020,7(5):841

Rutile-type fluorides have been proven to be active components in the context of emerging antiferr-omagnetic devices. However, controlled synthesis of low-dimensional, in particular two-dimensional (2D), fluorides in a predictable and deterministic manner remains unrealized because of a lack of efficient anisotropic control, which impedes their further development in reduced dimensions. We report here that altered passivation of {110} growing facets can direct the synthesis of rutile-type fluoride nanocrystals into well-defined zero-dimensional (0D) particulates, one-dimensional (1D) rods and 2D sheets in a colloidal approach. The obtained nanocrystals show positive exchange bias and enhanced magnetic transition temperature from the coexistence of long-range antiferromagnetic order and disordered surface spins, making them strong alternatives for flexible magnetic devices and sensors.  相似文献   

Equatorial aurora: the aurora-like airglow in the negative magnetic anomaly     

Fei He  Yong Wei  Weixing Wan 《国家科学评论(英文版)》2020,7(10):1606

The most fantastic optical phenomena in the Earth''s upper atmosphere are the auroras. They are highly informative indicators of solar activity, geomagnetic activity, upper atmospheric structures and dynamics, and magnetospheric energetic particles. An area where the geomagnetic field differs significantly from the expected symmetric dipole, such as at the South Atlantic Anomaly, where the magnetic field intensity is low, gives rise to stronger precipitation of energetic particles into the upper atmosphere. Impact excitation and the subsequent airglow emissions exhibit aurora-like dynamic signatures. Nomenclatures of nonpolar aurora or equatorial auroras are similar to those used with the polar auroras owing to their similar excitation mechanisms. This paper provides an overview of the knowledge and the challenges concerning auroral activity at the South Atlantic Anomaly, or more generally, at the negative magnetic anomaly. We emphasize systematic investigation of the equatorial auroras to reveal the temporal and spatial evolution of the magnetic anomaly and the behaviour of energetic particles in near-Earth space.  相似文献