3,639 research outputs found
Expression, purification, crystallization and preliminary crystallographic analysis of chitinase A from Vibrio carchariae
InGaAs/GaAs/alkanethiolate radial superlattices: Experimental
A radial InGaAs/GaAs/1-hexadecanethiol superlattice is fabricated by the
roll-up of a strained InGaAs/GaAs bilayer passivated with a molecular
self-assembled monolayer. Our technique allows the formation of multi-period
inorganic/organic hybrid heterostructures. This paper contains the detailed
experimental description of how to fabricate these structures.Comment: 2 pages, no figures, Version 2; minor changes (fixed typos and update
references
Interaction Effects in Conductivity of Si Inversion Layers at Intermediate Temperatures
We compare the temperature dependence of resistivity \rho(T) of Si MOSFETs
with the recent theory by Zala et al. This comparison does not involve any
fitting parameters: the effective mass m* and g*-factor for mobile electrons
have been found independently. An anomalous increase of \rho with temperature,
which has been considered a signature of the "metallic" state, can be described
quantitatively by the interaction effects in the ballistic regime. The in-plane
magnetoresistance \rho(B) is qualitatively consistent with the theory; however,
the lack of quantitative agreement indicates that the magnetoresistance is more
susceptible to the sample-specific effects than \rho(T).Comment: 4 pages, 5 figures. References update
Die Shoemaker und Strangways-Krater: Zwei Impaktstrukturen in Australien in der GIS-gestützten Analyse von Fernerkundungs- und Geländedaten
Die Berücksichtigung von Fernerkundungsdaten in geologischen
Informationssystemen (GIS) bietet für die Erkundung von terrestrischen Impaktstrukturen neuartige
Möglichkeiten. Am Beispiel der komplexen proterozoischen Impaktkrater Shoemaker und Strangways
wird gezeigt, dass die Einbindung multispektraler Landsat TM-Daten, Radardaten (ERS-2),
geophysikalischer Daten (Aeromagnetik, Aeroradiometrie), Geländebefunden und bereits
vorhandener geologischer Karteninformation in ein GIS raumbezogene Abfragen gestattet und z.T.
Wissenslücken schließen kann. So lassen sich ursprüngliche Kraterdurchmesser und Erosionsniveaus
für beide Strukturen besser abschätzen
Three-Dimensionally Confined Optical Modes in Quantum Well Microtube Ring Resonators
We report on microtube ring resonators with quantum wells embedded as an
optically active material. Optical modes are observed over a broad energy
range. Their properties strongly depend on the exact geometry of the microtube
along its axis. In particular we observe (i) preferential emission of light on
the inside edge of the microtube and (ii) confinement of light also in
direction of the tube axis by an axially varying geometry which is explained in
an expanded waveguide model.Comment: 5 pages, 4 figure
Probing molecular kinetics with Markov models: Metastable states, transition pathways and spectroscopic observables
Resolving the apparent gap in complexity between simulated and measured kinetics of biomolecules
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