Materials Literature
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Wie Lackmuspapier bei steigendem pH-Wert seine Farbe von Rot nach Blau ändert, so verschiebt sich die Fluoreszenzemission des Oxazol-Derivats 1 von Grün nach Blau. Durch Bestimmung des Intensitätsverhältnisses der Fluoreszenzemissionen der zwei Spezies – nach Ein- oder Zweiphotonenanregung – kann 1 als pH-Sensor bei m…
The development of renin inhibitors for the treatment of hypertension requires highly sensitive substrates to evaluate potency and to characterize the mechanism of tight-binding inhibitors. A series of intramolecularly quenched fluorogenic renin substrates, based on the N-terminal tetradecapeptide sequence of human an…
KSI (ketosteroid isomerase) catalyses an allylic isomerization reaction at a diffusion-controlled rate. A hydrogen bond network, Asp(99).Water(504).Tyr(14).Tyr(55).Tyr(30), connects two critical catalytic residues, Tyr(14) and Asp(99), with Tyr(30), Tyr(55) and a water molecule in the highly apolar active site of the…
We present a clear signature of the Schottky effect in a rf photoinjector using photons with energy lower than the Mg cathode work function. This signature is manifested by the shift in the rf phase angle for the onset of the detection of photoelectrons via single-photon absorption and allows for a reasonable estimate…
Abstract The radical co‐ and terpolymerization of 4‐[(α,β,β‐trifluorovinyl)oxy]bromo benzene (TFVOBB) with 1,1‐difluoroethylene (or vinylidene fluoride, VDF, or VF 2 ), hexafluoropropene (HFP), perfluoromethyl vinyl ether (PMVE), and chlorotrifluroroethylene (CTFE) is presented. Although TFVOBB could be thermocyclodim…
A detailed investigation of the thermodynamic properties of ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}\mathrm{Mn}{\mathrm{O}}_{3}\phantom{\rule{0.3em}{0ex}}(0\ensuremath{\leqslant}x\ensuremath{\leqslant}0.52)$ for possible applications in magnetic refrigeration is presented. The adiabatic magnetic entropy chan…
The coupled wave method (CWM) is used to analyse electromagnetic wave diffraction by a dielectric grating mounted on dielectric or metallic substrates. Under certain conditions there occurs coupled wave resonance (CWR) that consists in an abrupt increase of the electromagnetic field inside the grating. The CWR charact…
Bound to cooperate: Binding of dimethylviologen in the cavity of a Zn porphyrin host dramatically increases the affinity of the host for N-donating ligands and vice versa (see scheme). These positive heterotropic allosteric effects are exploited to direct complex equilibrium mixtures towards a single self-assembled sp…
Abstract Raman spectra of phosphates of the variscite mineral group, namely strengite, variscite, metavariscite and phosphosiderite, were obtained at 298 and 77 K using a thermal stage and complemented with selected infrared data using a diamond attenuated total reflection cell. Multiple phosphate stretching bands are…
Kopf-Schwanz-Nanoheterostrukturen, bestehend aus ZnO-Nanostäben und Silber-Nanopartikeln (siehe Bild), werden durch ortsspezifische Photoreduktion von Silberionen auf der Oberfläche von ZnO-Nanostäben aufgebaut. Mehrere Mechanismen für diesen Prozess werden diskutiert.
A (II,Mn)VI diluted magnetic semiconductor quantum dot with an integer number of electrons controlled with a gate voltage is considered. We show that a single electron is able to induce a collective spontaneous magnetization of the Mn spins, overcoming the short range antiferromagnetic interactions, at a temperature o…
How strong is the H⋅⋅⋅H bond in solid BH3NH3? Insight from periodic density functional calculations predicts an average value of 12.7 kJ mol−1, reassigning the interaction towards the lower end of the dihydrogen bond strength spectrum.
Nephrogenic fibrosing dermopathy (NFD), a newly recognized scleroderma-like disease, was originally described as a purely cutaneous disorder. More widespread involvement, including fibrosis of pulmonary and cardiac tissues, has been documented only recently, and it has been suggested that a more appropriate designatio…
Crystal gazing: A mild solution route has been designed for the controlled synthesis of lead tungstate microcrystals with high crystal symmetry, in which the cationic surfactant, pH value, and temperature play key roles. Helix- (see TEM image), spindle-, chainlike, and dendritic structures can be produced by varying t…
We report the results of 87Rb NMR measurements on RbOs2O6, a new member of the family of the superconducting pyrochlore-type oxides with a critical temperature Tc = 6.4 K. In the normal state, the nuclear spin-lattice relaxation time T1 obeys the Korringa-type relation T1T = constant and the Knight shift is independen…
A resonant-cavity enhanced detector operating in the mid-infrared at a wavelength around 3.6 micron is demonstrated. The device is based on a narrow-gap lead salt heterostructure grown by molecular beam epitaxy. Below 140 K, the photovoltage clearly shows a single narrow cavity resonance, with a relative line width of…
We show that efficient quantum computation is possible using a disordered Heisenberg spin-chain with `always-on' couplings. Such disorder occurs naturally in nanofabricated systems. Considering a simple chain setup, we show that an arbitrary two-qubit gate can be implemented using just three relaxations of a controlle…
By use of first-principles electronic structure calculations, we predict that the magnetoresistance of the bcc Co(100)/MgO(100)/bcc Co(100) and FeCo(100)/MgO(100)/FeCo(100) tunneling junctions can be several times larger than the very large magnetoresistance predicted for the Fe(100)/MgO(100)/Fe(100) system. The origi…
A parameter free calculation of the resistivity is applied to liquid metals near the melting point ranging from weak to strong scattering limit. The method is based on length dependent resistance calculations for quasi-one dimensional systems and was applied on structures with up to 10000 atoms. The calculated value f…
Certain surfactant monolayers at the water-air interface have been found to undergo, at a critical surface pressure, a dynamic instability involving multiple long folds of micron width. We exploit the sharp monolayer translations accompanying folding events to acquire, using a combination of fluorescence microscopy an…