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排序方式: 共有97条查询结果,搜索用时 15 毫秒
1.
2.
Balamurugan S Ista LK Yan J López GP Fick J Himmelhaus M Grunze M 《Journal of the American Chemical Society》2005,127(42):14548-14549
Surface-grafted, environmentally responsive polymers have shown great promise for controlling adsorption and desorption of macromolecules and cells on solid surfaces. In the paper, we demonstrate that certain mixed self-assembled monolayers (SAMs) of oligo(ethylene glycol) (OEG) and methyl-terminated alkanethiolates on gold form surfaces with switchable hydrophobicity and tendency for protein adsorption and cellular attachment. At temperatures above 32 degrees C, SAMs with a surface density of approximately 50% OEG adsorbed significant amounts of pyruvate kinase and lysozyme, whereas below this temperature, these same SAMs were resistant to the adsorption of these proteins. Furthermore, protein layers adsorbed to these SAMs above 32 degrees C were removed upon rinsing with water below this temperature. Similar results were seen for attachment and release of the marine bacterium, Cobetia marina. The change from nonresistance to adsorptive state of the SAMs was concomitant with a change in advancing water contact angle. Vibrational sum frequency generation spectroscopy suggests that the temperature-induced changes coincide with a disorder-to-partial order transition of the hydrated methylene chains of the OEG moieties within the SAMs. Mixed OEG-methyl SAMs represent both a convenient means of controlling macromolecular and cellular adsorption within the laboratory and a useful tool for relating adsorption properties to molecular structures within the SAMs. 相似文献
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Doyle AW Fick J Himmelhaus M Eck W Graziani I Prudovsky I Grunze M Maciag T Neivandt DJ 《Langmuir : the ACS journal of surfaces and colloids》2004,20(21):8961-8965
Structural deformations of lipid hybrid bilayer membranes induced by signal peptideless (SPL) proteins have been studied for the first time using the inherently surface specific nonlinear optical technique of sum frequency generation vibrational spectroscopy. Specifically, deformations of 1,2-distearoylphosphatidylglycerol(DSPG) membranes induced by interaction with FGF-1, a SPL protein which is released asa function of cellular stress through a nonclassical pathway, have been investigated. FGF-1 was found to induce lipid alkyl chain deformations in previously highly ordered DSPG membranes at the extremely low concentration of 1 nM at 60 degrees C. The deformation process was shown to exhibit a degree of reversibility upon removal of the protein by rinsing with buffer solution. 相似文献
5.
Abu-Zayyad T Belov K Bird DJ Boyer J Cao Z Catanese M Chen GF Clay RW Covault CE Cronin JW Dai HY Dawson BR Elbert JW Fick BE Fortson LF Fowler JW Gibbs KG Glasmacher MA Green KD Ho Y Huang A Jui CC Kidd MJ Kieda DB Knapp BC Ko S 《Physical review letters》2000,84(19):4276-4279
The average mass composition of cosmic rays with primary energies between 10(17) and 10(18) eV has been studied using a hybrid detector consisting of the High Resolution Fly's Eye (HiRes) prototype and the MIA muon array. Measurements have been made of the change in the depth of shower maximum and the muon density as a function of energy. The results show that the composition is changing from a heavy to lighter mix as the energy increases. 相似文献
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W. Preyss M. Detje H.-D. Ebinger H.J. Jänsch C. Polenz B. Polivka R. Veith D. Fick 《Hyperfine Interactions》1997,110(3-4):295-312
Nuclear spin relaxation experiments with 8Li adsorbed on various surfaces provide new information in surface science which is not obtainable othervise. Both dipolar
(Korringa) and quadrupolar relaxation due to diffusion are observed. However, in addition, a fast and presently not understood
spin relaxation mechanism is present while dosing during the first 0.5 s the surface with polarized 8Li. Most strange in this respect is the fact that those 8Li atoms which survive depolarization through this mechanism depolarize afterwards with modest spin lattice relaxation rates.
The origin of the fast spin lattice relaxation mechanism is presently unknown.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
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Ilse Koenig D. Fick S. Kossionides P. Egelhof K. -H. Möbius E. Steffens 《Zeitschrift für Physik A Hadrons and Nuclei》1984,318(2):135-146
The production of vector polarized recoil nuclei was investigated for nuclear reactions initiated by vector polarized6Li and7Li beams of energies up to 20 MeV. The vector polarization was detected by theβ-asymmetry of the decaying recoil nuclei implanted into various stopper materials. Considerable polarization values were observed for8Li produced in the systems7Li+9Be,7Li+7Li and6Li+7Li, and for12B in the systems7Li+7Li and6Li+11B. However, no polarization has been observed for heavier nuclei with unknown nuclear moments. The relaxation of the vector polarization of8Li implanted into various stopper materials at room temperature was investigated in detail. For a gold stopper it was found to be much larger when compared to earlier results. 相似文献
10.
The Faddeev equations are applied to the Deuteron-4He system. For the interactions between the particles squarewell potentials are used. In order to solve the Faddeev equations, thet-matrix is approximated by one separable term. The phaseshifts of the elastic Deuteron-4He scattering are calculated. It is shown, that the separable approximation by only one term is insufficient for such calculations. 相似文献