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Egidijus E. Uzgiris 《Progress in Surface Science》1981,10(1):53-164
Electrophoretic motion of particles, molecules, and biological cells can be readily measured by laser Doppler techniques. Small frequency shifts associated with the motion of the scatterers are detected by heterodyne detection of the scattered laser light. The principles of laser light scattering and heterodyne detection are reviewed. The central experimental problems associated with the application of electric fields to conducting solutions are considered in detail. Various types of laser Doppler spectrometers and electrophoresis chambers are compared both from fundamental physical points of view as well as in terms of resolving power of standard marker cells. As applications of the laser Doppler technique, measurements on proteins, virtues, nucleic acids, bioparticles and biological cells are reviewed. 相似文献
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Owen DM Auksorius E Manning HB Talbot CB de Beule PA Dunsby C Neil MA French PM 《Optics letters》2007,32(23):3408-3410
We present a time-gated, optically sectioned, hyperspectral fluorescence lifetime imaging (FLIM) microscope incorporating a tunable supercontinuum excitation source extending into the UV. The system is capable of resolving the excitation spectrum, emission spectrum, and fluorescence decays in an optically sectioned image. 相似文献
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Filamentation of Bessel-Gauss pulses propagating in borosilicate glass is found to produce damage lines extending over hundreds of micrometers and consisting of discrete, equidistant damage spots. These discrete damage traces are explained by self-regeneration of Gauss-Bessel beams during propagation and are potentially applicable in laser microfabrication of transparent materials. 相似文献
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Aurimas Bieliauskas Vytas Martynaitis Vytautas Getautis Tadas Malinauskas Vygintas Jankauskas Egidijus Kamarauskas Wolfgang Holzer Algirdas Šačkus 《Tetrahedron》2012,68(18):3552-3559
3-(10-Alkyl-10H-phenothiazin-3-yl)-2-propenals and their corresponding 3,3′-bispropenals that represent a previously unexplored class of functionalised phenothiazine derivatives were prepared upon reacting N-alkylated 3-bromo- and 3,7-dibromo-10H-phenothiazines with acrolein diethyl acetal under Pd catalysis. The obtained heterocyclic 2,3-unsaturated aldehydes were condensed with N-methyl-N-phenylhydrazine and N,N-diphenylhydrazine resulting in mono- and dihydrazones that act as effective hole transporting materials. Thermal, optical, electrochemical and photophysical properties of the synthesised new organic electroactive derivatives have been investigated. 相似文献
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A study of size exclusion and enrichment of proteins employing strong cation-exchange diol silica restricted access material (SCX-RAM) under saturation conditions is presented. Experiments were carried out with bacitracin, protamine, ribonuclease, lysozyme and bovine serum albumin as individual proteinaceous analytes as well as comprehensive binary mixtures and with human urine samples. Protein size dependent capacity features of the SCX-RAM column was observed. Bacitracin demonstrated the highest capacity followed by protamine while adsorption capacities of both ribonuclease and lysozyme were found smaller by a factor of 10. Applying binary protein samples occurring displacement effects were apparent: proteins with strong cationic properties displaced those already adsorbed by the bonded cation-exchange ligands. Bacitracin was displaced in all binary mixture experiments in particular by protamine. Furthermore, the binary mixtures displayed increased adsorption for some proteins due to complex formation. Lysozyme and ribonuclease showed double capacity values when paired with bacitracin. Both phenomena, displacement and enhanced adsorption occurred in the saturated state and led to changes in the urine composition during sample preparation. Injecting urine samples the relative proportions of fractions changed from 4 up to more than 20 times, due to the differences of the protein adsorption capacities on the SCX-RAM column. Analysing urine samples the SCX-RAM column provided extensive long-term stability. 相似文献
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Skudas R Grimes BA Machtejevas E Kudirkaite V Kornysova O Hennessy TP Lubda D Unger KK 《Journal of chromatography. A》2007,1144(1):72-84
In this work, monolithic silica columns with the C4, C8, and C18 chemistry and having various macropore diameters and two different mesopore diameters are studied to access the differences in the column efficiency under isocratic elution conditions and the resolution of selected peptide pairs under reversed-phase gradient elution conditions for the separation of peptides and proteins. The columns with the pore structural characteristics that provided the most efficient separations are then employed to optimize the conditions of a gradient separation of a model mixture of peptides and proteins based on surface chemistry, gradient time, volumetric flow rate, and acetonitrile concentration. Both the mesopore and macropore diameters of the monolithic column are decisive for the column efficiency. As the diameter of the through-pores decreases, the column efficiency increases. The large set of mesopores studied with a nominal diameter of approximately 25 nm provided the most efficient column performance. The efficiency of the monolithic silica columns increase with decreasing n-alkyl chain length in the sequence of C18相似文献
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Highly Efficient Perovskite Solar Cells Employing an Easily Attainable Bifluorenylidene‐Based Hole‐Transporting Material 下载免费PDF全文
Kasparas Rakstys Dr. Michael Saliba Dr. Peng Gao Paul Gratia Egidijus Kamarauskas Dr. Sanghyun Paek Dr. Vygintas Jankauskas Prof. Dr. Mohammad Khaja Nazeeruddin 《Angewandte Chemie (International ed. in English)》2016,55(26):7464-7468
The 4,4′‐dimethoxydiphenylamine‐substituted 9,9′‐bifluorenylidene ( KR216 ) hole transporting material has been synthesized using a straightforward two‐step procedure from commercially available and inexpensive starting reagents, mimicking the synthetically challenging 9,9′‐spirobifluorene moiety of the well‐studied spiro‐OMeTAD. A power conversion efficiency of 17.8 % has been reached employing a novel HTM in a perovskite solar cells. 相似文献