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41.
We prove the existence and uniqueness of global solutions for a Cauchy problem associated to a semilinear Klein‐Gordon equation in two space dimensions. Our result is based on an interpolation estimate with a sharp constant obtained by a standard variational method. © 2006 Wiley Periodicals, Inc. 相似文献
42.
Slim Ayadi Fabian Schwarzenberger Ivan Veselić 《Mathematical Physics, Analysis and Geometry》2013,16(4):309-330
We consider random Hamiltonians defined on long-range percolation graphs over $\mathbb {Z}^{d}$ . The Hamiltonian consists of a randomly weighted Laplacian plus a random potential. We prove uniform existence of the integrated density of states and express the IDS using a Pastur-Shubin trace formula. 相似文献
43.
Ben Braïek Olfa Smaoui Slim Fleury Yannick Morandi Stefano Hani Khaled Ghrairi Taoufik 《Applied biochemistry and biotechnology》2019,188(1):43-53
Applied Biochemistry and Biotechnology - Lactic acid bacteria produce various antibacterial peptides such as bacteriocins that are active against pathogenic and spoilage microorganisms. Very little... 相似文献
44.
Aida Karray Mona Alonazi Slim Smaoui Philippe Michaud Dina Soliman Abir Ben Bacha 《Molecules (Basel, Switzerland)》2020,25(22)
The main objective of the current study was the extraction, purification, and biochemical characterization of a protein protease inhibitor from Conyza dioscoridis. Antimicrobial potential and cytotoxic effects were also examined. The protease inhibitor was extracted in 0.1 M phosphate buffer (pH 6–7). Then, the protease inhibitor, named PDInhibitor, was purified using ammonium sulfate precipitation followed by filtration through a Sephadex G-50 column and had an apparent molecular weight of 25 kDa. The N-terminal sequence of PDInhibitor showed a high level of identity with those of the Kunitz family. PDInhibitor was found to be active at pH values ranging from 5.0 to 11.0, with maximal activity at pH 9.0. It was also fully active at 50 °C and maintained 90% of its stability at over 55 °C. The thermostability of the PDInhibitor was clearly enhanced by CaCl2 and sorbitol, whereas the presence of Ca2+ and Zn2+ ions, Sodium taurodeoxycholate (NaTDC), Sodium dodecyl sulfate (SDS), Dithiothreitol (DTT), and β-ME dramatically improved the inhibitory activity. A remarkable affinity of the protease inhibitor with available important therapeutic proteases (elastase and trypsin) was observed. PDInhibitor also acted as a potent inhibitor of commercial proteases from Aspergillus oryzae and of Proteinase K. The inhibitor displayed potent antimicrobial activity against gram+ and gram- bacteria and against fungal strains. Interestingly, PDInhibitor affected several human cancer cell lines, namely HCT-116, MDA-MB-231, and Lovo. Thus, it can be considered a potentially powerful therapeutic agent. 相似文献
45.
The existence of a local-in-time unique solution and loss of smoothness of a full Magneto-Hydro-Dynamics (MHD) system are considered for periodic initial data. The result is proven using Fujita–Kato’s method in based (for the Fourier coefficients) functional spaces enabling us to easily estimate nonlinear terms in the system as well as solutions to Maxwell’s equations. A loss of smoothness result is shown for the velocity and magnetic field. It comes from the damped-wave operator which does not have any smoothing effect. 相似文献
46.
Chongsheng Cao Slim Ibrahim Kenji Nakanishi Edriss S. Titi 《Communications in Mathematical Physics》2015,337(2):473-482
In an earlier work we have shown the global (for all initial data and all time) well-posedness of strong solutions to the three-dimensional viscous primitive equations of large scale oceanic and atmospheric dynamics. In this paper we show that for certain class of initial data the corresponding smooth solutions of the inviscid (non-viscous) primitive equations, if they exist, they blow up in finite time. Specifically, we consider the three-dimensional inviscid primitive equations in a three-dimensional infinite horizontal channel, subject to periodic boundary conditions in the horizontal directions, and with no-normal flow boundary conditions on the solid, top and bottom boundaries. For certain class of initial data we reduce this system into the two-dimensional system of primitive equations in an infinite horizontal strip with the same type of boundary conditions; and then we show that for specific sub-class of initial data the corresponding smooth solutions of the reduced inviscid two-dimensional system develop singularities in finite time. 相似文献
47.
Design and Stereoselective Synthesis of ProM‐2: A Spirocyclic Diproline Mimetic with Polyproline Type II (PPII) Helix Conformation 下载免费PDF全文
Dr. Cédric Reuter Dr. Robert Opitz Dr. Arne Soicke Stephan Dohmen Matthias Barone Slim Chiha Marco Tobias Klein Dr. Jörg‐Martin Neudörfl Dr. Ronald Kühne Prof. Dr. Hans‐Günther Schmalz 《Chemistry (Weinheim an der Bergstrasse, Germany)》2015,21(23):8464-8470
With the aim of developing polyproline type II helix (PPII) secondary‐structure mimetics for the modulation of prolin‐rich‐mediated protein–protein interactions, the novel diproline mimetic ProM‐2 was designed by bridging the two pyrrolidine rings of a diproline (Pro–Pro) unit through a Z‐vinylidene moiety. This scaffold, which closely resembles a section of a PPII helix, was then stereoselectively synthesized by exploiting a ruthenium‐catalyzed ring‐closing metathesis (RCM) as a late key step. The required vinylproline building blocks, that is, (R)‐N‐Boc‐2‐vinylproline (Boc=tert‐butyloxycarbonyl) and (S,S)‐5‐vinylproline‐tert‐butyl ester, were prepared on a gram scale as pure stereoisomers. The difficult peptide coupling of the sterically demanding building blocks was achieved in good yield and without epimerization by using 2‐(1H‐7‐azabenzotriazol‐1‐yl)‐1,1,3,3‐tetramethyluronium hexafluorophosphate (HATU)/N,N‐diisopropylethylamine (DIPEA). The RCM proceeded smoothly in the presence of the Grubbs II catalyst. Stereostructural assignments for several intermediates were secured by X‐ray crystallography. As a proof of concept, it was shown that certain peptides containing ProM‐2 exhibited improved (canonical) binding towards the Ena/VASP homology 1 (EVH1) domain as a relevant protein interaction target. 相似文献
48.
49.
Balmforth N. J.; Craster R. V.; Slim A. C. 《The Quarterly Journal of Mechanics and Applied Mathematics》2008,61(2):267-289
The Föppl-von Kármán equations are used toexplore the onset of linear instability and the subsequent nonlineardevelopment of buckling patterns in a flat elastic plate dueto an imposed shear or body force such as gravity. Experimentalresults are also presented for a clamped and sheared sheet ofNeoprene rubber and these compare favourably with theory. 相似文献
50.
Jihen Mahfoudh Slim Salhi Aurélie Auguste Christelle Delaite Rachid El Gharbi 《高分子科学杂志,A辑:纯化学与应用化学》2013,50(4):280-285
A series of random polyesteramides (PEAs) within a range of molar composition from 90/10 to 10/90 were synthesized by a direct melt polycondensation of glycolic acid and β-alanine. Their structures were fully characterized by NMR spectroscopy. The resulting copolymers are amorphous and present increasing glass transition temperatures at increasing β-alanine contents. The copolymers were also characterized by, FTIR, TGA and viscosimetry measurements. 相似文献