Formation of Intermediate Layers for Immobilization of Biomacromolecules by Self‐Assembling and Reduction of Phenyldiazonium Salts. A Comparative Study

Two types of biomolecules were tested in the comparison of usefulness of two ways of formation of the intermediate layers at electrodes: a 20‐nucleotide DNA sequence and glucose oxidase. Chronocoulometric, amperometric, electrochemical impedance and PM‐IRRAS experiments proved that the layers obtained by electroreduction of diazonium salts are much more stable and more efficient in the accumulation of biomolecules compared to layers obtained by self‐assembling of appropriate thiols.     

HF激光脉冲与水柱表面相互作用产生电信号(英文)

研究了脉冲HF激光与水柱表面相互作用下电信号的产生过程。电信号显示了与激光能量线性相关的峰值间有时间间隔的两峰结构,且第二个尖峰在水柱底部的蒸汽腔塌缩后出现。实验还显示电信号的幅值和激光脉冲照射过程中是否存在膨胀和挤压的薄水层密切相关。如果在电池上边缘和石英平板(石英板紧邻电池,并与水柱上表面相接)之间存在一薄水层,电信号强度会增加10倍。     

Signal Enhancement using A Swellable Polymer TSM Acoustic Wave Sensor Coating

ABSTRACT

The generation of large changes in the crystal frequency is a highly sought-after goal in designing a successful thickness-shear mode (TSM) acoustic wave sensor application. We examined the potential for modulating the mass loading and viscoelastic properties of a swellable polymeric coating to achieve this goal. Using a 10 MHz AT-cut crystal with an immobilized coating of a styrene-divinylbenzene copolymer, a high molecular weight target analyte with complementary ionic and molecular binding properties was selected. Injection of the antibiotic cefoperazone in a sodium acetate buffer generated exceptionally large changes in frequency, in the range 500 - 5000 Hz. The rate of change in frequency is proportional to the analytical concentration. A multi-step regeneration protocol allows the coating to be reused multiple times. These results suggest that TSM sensor sensitivities can be significantly enhanced for selected analytes by the judicious selection of an appropriate swellable polymer coating.     

TiO2对粉煤灰及石英砂制备微晶玻璃组织转变的影响

利用粉煤灰与石英砂制备微晶玻璃，并对其进行不同工艺的热处理．通过对热处理后的试样研究发现：当粉煤灰质量分数为30％，未加TiO2时，试样在780℃加热时首先析出过渡相Ca2SiO。，在随后的高温晶化过程中，过渡相溶解消失，析出更稳定的平衡相钙长石；当TiO2质量分数为0—15％时，随着TiO2含量的增加，在780℃加热时由析出梭形的Ca2SiO。微晶转变为析出粒状的钙长石微晶；当粉煤灰质量分数增加到40％，TiO2质量分数为3．5％时试样中出现网状微晶组织，而加入的形核剂TiO2质量分数达到5％时试样中无网状微晶组织出现，说明TiO2对网状组织的析出具有明显抑制作用．     

X-ray diffraction in AT-cut quartz single crystal at acoustic excitation at the fundamental frequency

X-ray diffraction on different atomic planes of an AT-cut quartz crystal is studied experimentally in the Laue geometry in case of excitation by acoustic waves at the first resonant (fundamental) frequency. Acoustic waves lead to an increase in the integral intensity of the reflection-diffracted beam. The amplification coefficients in reflection are measured in dependence on the amplitude of a.c. voltage applied to the crystal at the resonant frequency. The frontal distributions of the intensity of the beam diffracted in the reflection direction are obtained for different atomic planes.     

辐照及加热对天然水晶透射光谱的影响

用钴60的γ射线辐照然后再加热的方法处理了一些天然水晶样品,对颜色和透射光谱的变化情况进行了实验观察.天然水晶和实验得到的墨晶样品的颜色和透射光谱的各种变化,与辐照剂量、热处理条件和水晶产地有关;某些晶片上还呈现有深色的条纹,可以把晶体内部的微裂纹与生长带显示出来.对以上现象进行了理论上的分析.     

福建莆田县山柄一港里地区硅线石矿床地质特征及其成因探讨

本文论述了福建莆田县山柄—港里地区硅线石矿床的地质特征、成因以及成矿作用;介绍了硅线石的主要矿物成分、粒度和嵌布特性及其选矿试验结果、产品的耐火性能,为开发和利用该地区硅线石资源提供了依据。