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81.
G. Korndörfer 《Mathematische Annalen》1871,3(3):415-423
Ohne Zusammenfassung 相似文献
82.
Dr. Sandra Ast Dr. Thomas Schwarze Holger Müller Dr. Aleksey Sukhanov Dr. Stefanie Michaelis Prof. Dr. Joachim Wegener Prof. Dr. Otto S. Wolfbeis Prof. Dr. Thomas Körzdörfer Dr. Axel Dürkop Prof. Dr. Hans‐Jürgen Holdt 《Chemistry (Weinheim an der Bergstrasse, Germany)》2013,19(44):14911-14917
Herein, we report the synthesis of two phenylaza‐[18]crown‐6 lariat ethers with a coumarin fluorophore ( 1 and 2 ) and we reveal that compound 1 is an excellent probe for K+ ions under simulated physiological conditions. The presence of a 2‐methoxyethoxy lariat group at the ortho position of the anilino moiety is crucial to the substantially increased stability of compounds 1 and 2 over their lariat‐free phenylaza‐[18]crown‐6 ether analogues. Probe 1 shows a high K+/Na+ selectivity and a 2.5‐fold fluorescence enhancement was observed in the presence of 100 mM K+ ions. A fluorescent membrane sensor, which was prepared by incorporating probe 1 into a hydrogel, showed a fully reversible response, a response time of 150 s, and a signal change of 7.8 % per 1 mM K+ within the range 1–10 mM K+. The membrane was easily fabricated (only a single sensing layer on a solid polyester support), yet no leaching was observed. Moreover, compound 1 rapidly permeated into cells, was cytocompatible, and was suitable for the fluorescent imaging of K+ ions on both the extracellular and intracellular levels. 相似文献
83.
84.
T. P. Papageorgiou E. Casini H. F. Braun T. Herrmannsdörfer A. D. Bianchi J. Wosnitza 《The European Physical Journal B - Condensed Matter and Complex Systems》2006,52(3):383-388
Based on field-cooled dc-magnetization measurements in a
SQUID magnetometer with carefully controlled magnetic-field
profiles, we present evidence that diamagnetism is missing in the
superconducting state (T < 50 K) of the (weakly) ferromagnetic
(TM ≈130 K) superconductor RuSr2GdCu2O8
(Ru1212). Nevertheless, taking into account the granular nature of
the samples investigated so far, this cannot be taken as evidence
for the lack of a Meissner state or bulk superconductivity. It is
shown that for low applied magnetic fields a vortex state most
probably involves the intergrain area (area between the grains)
rather than the individual grains (bulk Ru1212). Furthermore, the
wide superconducting transition of Ru1212 (Tc,onset = Tc
≈48 K, Ts(R = 0) = Ts = 32 K) realized in
resistance measurements in zero applied magnetic field can be
readily understood as the effect of resistive grain contacts and is
not necessarily related to the movement of spontaneously induced
vortices in bulk Ru1212, as it has been suggested previously. A
comparison of the low-temperature specific heat of
Sr2GdRuO6 (Sr2116), the precursor for the preparation of
Ru1212 and thus a possible impurity phase, with previously reported
data for Ru1212 shows that it is unlikely that Sr2116 is responsible
for the specific-heat features attributed to the superconductivity
of Ru1212 and supports the existence of a bulk superconducting state
in the latter compound. 相似文献
85.
86.
87.
Feist J Nagele S Ticknor C Schneider BI Collins LA Burgdörfer J 《Physical review letters》2011,107(9):093005
We show that the correlation dynamics in coherently excited doubly excited resonances of helium can be followed in real time by two-photon interferometry. This approach promises to map the evolution of the two-electron wave packet onto experimentally easily accessible noncoincident single-electron spectra. We analyze the interferometric signal in terms of a semianalytical model which is validated by a numerical solution of the time-dependent two-electron Schr?dinger equation in its full dimensionality. 相似文献
88.
Christine Liebendörfer 《代数通讯》2013,41(10):3699-3717
We provide here a very preliminary—or somehow experimental—result in the direction of the stability of free products of stable groups, restricting ourselves to quantifer-free definable sets and to bounded balls of free products. 相似文献
89.
Nadine Allendörfer Mazen Es-Sayed Martin Nieger Stefan Bräse 《Tetrahedron letters》2012,53(4):388-391
Organofluorine compounds are of high interest in modern drug discovery and material sciences. We herein report a new synthetic access to o-amino-2,2,2-trifluoroacetophenones starting from commercially available o-amino benzoic acids, which can easily be converted into the corresponding benzoxazinones. In a second step the trifluoromethylated ketone is formed via addition of Ruppert’s reagent following acidic work up. 相似文献
90.
Zhao W Mestayer JJ Lancaster JC Dunning FB Reinhold CO Yoshida S Burgdörfer J 《Physical review letters》2006,97(25):253003
The ability to localize and to steer Rydberg wave packets in phase space using tailored sequences of half-cycle pulses is demonstrated. Classical phase-space portraits are used to explain the method and to illustrate the level of control that can be achieved. This is confirmed experimentally by positioning a phase-space-localized wave packet at the center of a stable island or navigating it around its periphery. This work provides a valuable starting point for further engineering of electronic wave functions. 相似文献