Materials Literature
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We study the thermal motion of colloidal tracer particles in entangled actin filament (F-actin) networks, where the particle radius is comparable to the mesh size of the F-actin network. In this regime, the ensemble-averaged mean-squared displacement of the particles is proportional to tau(gamma), where 0<gamma<1 from…
Silver and gold nanotriangles were fabricated by nanosphere lithography (NSL) and their localized surface plasmon resonance (LSPR) spectra were measured by UV−vis extinction spectroscopy. It is demonstrated that the short range (viz., 0−2 nm) distance dependence of the electromagnetic fields that surround these nanopa…
To investigate the mechanism of structural changes of a peptide nanotube and water confined inside the channel, the helical peptide tryptophylglycine monohydrate (WG.H2O) was studied by molecular dynamics (MD) simulations using the three-dimension parallel MD program ddgmq (software package) and a consistent force fie…
We report the influence of solution stirring on the growth of hen egg white lysozyme crystals. Solution stirring rate was controlled by varying the rotation speed of a rotary shaker. A range of precipitation agent (sodium chloride) concentrations was also investigated. The time required for crystal nucleation to occur…
We present a parallel-mode EPR study of a very high-spin ground-state cluster complex $[{\mathrm{Cr}}_{12}{\mathrm{O}}_{9}(\mathrm{OH}{)}_{3}({\mathrm{O}}_{2}{\mathrm{CCMe}}_{3}{)}_{15}],$ where Me indicates the methyl group. This high-symmetry ${(D}_{3})$ molecule has a well-isolated $S=6$ ground state characterized…
Magnetic nanostructures are attracting tremendous interest as regards application in high-density data storage devices and magnetic fluids. We have prepared magnetic nanoparticles ( nm) by x-ray irradiation of electroless solutions and furthermore have investigated their structural and magnetic properties. Interesting…
Crystallization in amorphous Ge 2 Sb 2 Te 5 films has been demonstrated using scanning tunneling microscopes. Pulse voltages higher than 3 V applied through W tips produce electrically conductive deformed marks with a diameter larger than ∼50 nm. Raman scattering spectra show that such marks contain crystalline Te, wh…
Surface-enhanced resonance Raman scattering (SERRS) is considerably more efficient than Raman spectroscopy, thereby enabling the detection of single molecules. Strong and short-lived SERRS emissions (<100 ms) from single, partially silver-coated, dye-adsorbed microparticles have been detected within optical tweezers (…
The pH-dependent (1)H NMR characteristics of a series of Co(III)-(polyamin)-aqua and Co(III)-(polyamin)-(polyalcohol) complexes, [Co(tach)(ino-kappa(3)-O(1,3,5))](3+) (1(3+)), [Co(tach)(ino-kappa(3)-Omicron(1,2,6))](3+) (2(3+)), [Co(tach)(taci-kappa-Nu(1)-kappa(2)-O(2,6))](3+) (3(3+)), [Co(ditame)(H(2)O)](3+) (4(3+)),…
A new motif of three-dimensional (3D) protein structure is described, called the cis-Pro touch-turn. In this four-residue, three-peptide motif, the central peptide is cis. Residue 2, which precedes the proline, has phi, psi values either in the "prePro region" of the Ramachandran plot near -130 degrees, 75 degrees or…
The study of solid-state ionic systems hinges on the calculation of electrostatic forces between charged ions. Recently, empirical models incorporating variable-charge schemes have been developed for titanium oxides and other ionic solids, combining the charge equilibration scheme with short-range Morse-stretch potent…
In magnetic materials of the Prussian-blue type, what proportion of the unpaired electrons in the simple hexacyanometalate moves from the metal (red) to the carbon (gray) and nitrogen (green) atoms? Based on the solid-state 13C and 15N NMR spectra, the amount, the sign, and the shape of the spin densities can be disti…
The superconductivity of graphite-sulfur composites is highly anisotropic and associated with the graphite planes. The superconducting state coexists with the ferromagnetism of pure graphite, and a continuous crossover from superconducting to ferromagneticlike behavior could be achieved by increasing the magnetic fiel…
Raman spectroscopy was used to seek out the orbital excitations in orbitally ordered RMnO3. The high energy Raman peaks are found to correspond to second and third order phonons which couple in some degree to the orbital order. Franck-Condon-type Raman resonance of multiphonons is observed but the cross sections are s…
We report on adsorption results obtained on bundles of HiPco nanotubes. We compare the values for the specific surface area of these nanotubes, measured by performing monolayer completion determinations on the same sample with four different adsorbates. We also present adsorption results for neon on the HiPco nanotube…
We have performed a normal-mode analysis on a glass forming polymer system for bulk and free-standing film geometries prepared under identical conditions. It is found that for free-standing film glasses, the normal-mode spectrum exhibits significant differences from the bulk glass with the appearance of an additional…
Abstract A poly(amic acid) derived from pyromellitic dianhydride and oxydianiline was imidized under different conditions. The sample imidized in solution (PI‐1) showed the X‐ray diffraction pattern of a crystalline material, whereas that of the sample imidized in the solid state was essentially amorphous. Both sample…
Abstract An jeder photochemischen Reaktion sind photoangeregte Moleküle beteiligt. Die Kenntnis ihrer Strukturen in fehlgeordneten Medien, in denen die meisten photochemischen Reaktionen ablaufen, ist Voraussetzung für das Verständnis der Photochemie. Über diese Strukturen war lange aber nur wenig bekannt, weil geeign…
Recently, the structures of two proteins belonging to the archease family, TM1083 from Thermotoga maritima and MTH1598 from Methanobacterium thermoautotrophicum, have been solved independently by two Protein Structure Initiative structural genomics pilot centers using X-ray crystallography and NMR, respectively. The a…
Abstract Poly(2‐ethyl hexylacrylate) (PEHA)/silicate composites were synthesized by the emulsion polymerization of ethyl hexylacrylate (EHA) in the presence of sorbitol and the composites were analyzed to be of nano order. The nanocomposites so prepared were shown to be intercalated by X‐ray diffraction, transmission…