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71.
Duncombe BJ Duale K Buchanan-Smith A Stace AJ 《The journal of physical chemistry. A》2007,111(24):5158-5165
A detailed study has been undertaken of the gas-phase chemistry of [Cu(H2O)N]2+ and [Cu(NH3)N]2+ complexes. Ion intensity distributions and fragmentation pathways (unimolecular and collision-induced) have been recorded for both complexes out as far as N=20. Unimolecular fragmentation is dominated by Coulomb explosion (separation into two single charged units) on the part of the smaller ions, but switches to neutral molecule loss for N>7. In contrast, collisional activation promotes extensive electron capture from the collision gas, with the appearance of particular singly charged fragment ions being sensitive to the size and composition of the precursor. The results show clear evidence of the unit [Cu(X)8]2+ being of special significance, and it is proposed that the hydrogen-bonded structure associated with this ion is responsible for stabilizing the dipositive charge on Cu2+ in aqueous solution. 相似文献
72.
In this paper, we study the solutions to the Schr?dinger equation on some conformally flat cylinders and on the n-torus. First, we apply an appropriate regularization procedure. Using the Clifford algebra calculus with an appropriate Witt
basis, the solutions can be expressed as multiperiodic eigensolutions to the regularized parabolic-type Dirac operator. We
study their fundamental properties, give representation formulas of all these solutions in terms of multiperiodic generalizations
of the elliptic functions in the context of the regularized parabolic-type Dirac operator. Furthermore, we also develop some
integral representation formulas. In particular, we set up a Green type integral formula for the solutions to the homogeneous
regularized Schr?dinger equation on cylinders and n-tori. Then, we treat the inhomogeneous Schr?dinger equation with prescribed boundary conditions in Lipschitz domains on these
manifolds. We present an L
p
-decomposition where one of the components is the kernel of the first-order differential operator that factorizes the cylindrical
(resp. toroidal) Schr?dinger operator. Finally, we study the behavior of our results in the limit case where the regularization
parameter tends to zero. 相似文献
73.
Eckhard Hennig Dominik Krauße Eric Schäfer Ralf Sommer Carsten Trunk Henrik Winkler 《PAMM》2011,11(1):837-838
Structured perturbations of regular pencils of the form , are considered which model the addition of a capacitance c in an electrical circuit in order to improve the frequency response. (© 2011 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
74.
In this paper we present a Hodge-type decomposition for variable exponent spaces. More concretely, we address some time-dependent parabolic firstorder partial differential operators with non-constant coefficients, where one of the components is the kernel of the parabolic-type Dirac operator. This decomposition is presented over different types of domains in the n-dimensional Euclidean space n-dimensional Euclidean space \({\mathbb{R}^{n}}\) . The case of the time-dependent Schrödinger operator is included as a special case within this context. 相似文献
75.
F. Krauß 《Mathematische Annalen》1929,101(1):61-92
Ohne Zusammenfassung 相似文献
76.
77.
Julie Arnaud Kevin Tröndle Dr. Julie Claudinon Dr. Aymeric Audfray Dr. Annabelle Varrot Prof. Winfried Römer Dr. Anne Imberty 《Angewandte Chemie (International ed. in English)》2014,53(35):9267-9270
Lectins are glycan‐binding proteins that are involved in the recognition of glycoconjugates at the cell surface. When binding to glycolipids, multivalent lectins can affect their distribution and alter membrane shapes. Neolectins have now been designed with controlled number and position of binding sites to decipher the role of multivalency on avidity to a glycosylated surface and on membrane dynamics of glycolipids. A monomeric hexavalent neolectin has been first engineered from a trimeric hexavalent bacterial lectin, From this neolectin template, 13 different neolectins with a valency ranging from 0 to 6 were designed, produced, and analyzed for their ability to bind fucose in solution, to attach to a glycosylated surface and to invaginate glycolipid‐containing giant liposomes. Whereas the avidity only depends on the presence of at least two binding sites, the ability to bend and invaginate membranes critically depends on the distance between two adjacent binding sites. 相似文献
78.
W. Eisenmenger K. Laßmann H. J. Trumpp R. Krauß 《Applied Physics A: Materials Science & Processing》1977,12(2):163-171
Experimental quasiparticle recombination lifetime data for superconducting Al, Sn, and Pb films are compared with calculations
based on a ray acoustic model taking account of the film thickness dependence of the reabsorption of recombination phonons.
Information on the true or intrinsic quasiparticle recombination lifetime obtained from these and other data is discussed. 相似文献
79.
Aurore Cabanettes Lukas Perkams Carolina Spies Prof. Dr. Carlo Unverzagt Dr. Annabelle Varrot 《Angewandte Chemie (International ed. in English)》2018,57(32):10178-10181
The mini fungal lectin PhoSL was recombinantly produced and characterized. Despite a length of only 40 amino acids, PhoSL exclusively recognizes N‐glycans with α1,6‐linked fucose. Core fucosylation influences the intrinsic properties and bioactivities of mammalian N‐glycoproteins and its level is linked to various cancers. Thus, PhoSL serves as a promising tool for glycoprofiling. Without structural precedence, the crystal structure was solved using the zinc anomalous signal, and revealed an interlaced trimer creating a novel protein fold termed β‐prism III. Three biantennary core‐fucosylated N‐glycan azides of 8 to 12 sugars were cocrystallized with PhoSL. The resulting highly resolved structures gave a detailed view on how the exclusive recognition of α1,6‐fucosylated N‐glycans by such a small protein occurs. This work also provided a protein consensus motif for the observed specificity as well as a glimpse into N‐glycan flexibility upon binding. 相似文献
80.
Over the past fifty years, hundreds of polyyne compounds have been isolated from nature. These often unstable molecules are found in sources as common as garden vegetables and as obscure as bacterial cultures. Naturally occurring polyynes feature a wide range of structural diversity and display an equally broad array of biological properties. Early synthetic efforts relied primarily on Cu-catalyzed, oxidative acetylenic homo- and heterocoupling reactions to assemble the polyyne framework. The past 25 years, however, have witnessed a renaissance in the field of polyyne natural product synthesis: transition-metal-catalyzed alkynylation reactions and asymmetric transformations have combined to substantially expand access to natural polyynes. This Review recounts these synthetic achievements and also highlights both the natural source(s) and biological relevance for many of these compounds. 相似文献