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Search Results: 1 - 10 of 844 matches for " Kathrin Enke-Melzer "
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Circulating Angiogenic Factors in Patients with Thromboangiitis Obliterans
Bernd Hewing, Verena Stangl, Karl Stangl, Kathrin Enke-Melzer, Gert Baumann, Antje Ludwig
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0034717
Abstract: Background Thromboangiitis obliterans (TAO, also known as Buerger's disease) is a non-atherosclerotic inflammatory vascular disease that primarily affects arteries in the extremities of young adult smokers. Since the etiology of TAO is still unknown, therapeutic options are limited. Recent attempts in therapeutic angiogenesis have been promising. Therefore, the aim of our study was to evaluate angiogenic processes and factors including circulating progenitor cells in TAO. Methodology/Principal Findings TAO patients with critical limb ischemia and age- and gender-matched nonsmokers and smokers without cardiovascular disease (n = 12 in each group) were enrolled in the study. Flow cytometric analysis of peripheral blood showed significantly decreased levels of circulating CD45dimCD34+ progenitor cells in TAO patients and in smokers compared to nonsmokers. In contrast to both control groups, the proportion of CD45dimCD34+ progenitor cells co-expressing VEGF receptor-2 (VEGFR2) was significantly elevated in TAO patients. Enzyme-linked immunosorbent assay (ELISA) of common angiogenic factors (such as VEGF) did not clearly point to pro- or antiangiogenic conditions in serum or plasma of TAO patients. Serum of TAO patients and controls was evaluated in proliferation, migration (scratch assay) and spheroid sprouting assays using human umbilical vein endothelial cells (HUVECs). Serum of TAO patients exhibited a diminished sprouting capacity of HUVECs compared to both control groups. Proliferation and migration of endothelial cells were impaired after treatment with serum of TAO patients. Conclusion Levels of circulating progenitor cells were altered in TAO patients compared to healthy nonsmokers and smokers. Furthermore, serum of TAO patients exhibited an antiangiogenic activity (impaired endothelial cell sprouting, migration and proliferation) on endothelial cells, which may contribute to vascular pathology in this patient population.
Wireless Application Protocol (WAP)
Cindy Melzer
South African Journal of Information Management , 2009, DOI: 10.4102/sajim.v2i2/3.108
Abstract:
Wireless Application Protocol (WAP)
Cindy Melzer
South African Journal of Information Management , 2009, DOI: 10.4102/sajim.v1i4.76
Abstract:
Web Sitings
Cindy Melzer
South African Journal of Information Management , 2009, DOI: 10.4102/sajim.v2i4.118
Abstract:
Wireless Application Protocol (WAP)
Cindy Melzer
South African Journal of Information Management , 2009, DOI: 10.4102/sajim.v2i1.88
Abstract:
Zur Vorgeschichte des Dresdner Kupferstich-Kabinetts zwischen 1560 und 1738
Melzer, Christien
RIHA Journal , 2010,
Abstract: Though the Dresden Kupferstich-Kabinett was properly established only in 1720, the electoral Saxon Kunstkammer and library in Dresden included a collection of prints and drawings from their very beginnings in the mid-16th century. The article focuses on this early, and rarely discussed, history of the collection. From the Dresden holdings and hitherto unexamined sources, exemplary insights can be gained into scope, structure, aims, and accessibility of an early modern collection of art on paper. This throws light on issues in the history of science and of collecting art, on courtly representation, as well as on early modern discourses on art and order. In particular, it can be shown that the foundation of the Kupferstich-Kabinett in the early 18th century was the result of long and complex processes and developments, manifesting ever-evolving and constantly changing scientific taxonomies. Comparison of the Dresden collection with those in Munich, Ambras, Prag, and Paris, underscores the unparalleled continuity of its history.
Massive-Conformal Dictionary
Ezer Melzer
Physics , 1993, DOI: 10.1142/S0217751X94002375
Abstract: The finite-volume spectrum of an integrable massive perturbation of a rational conformal field theory interpolates between massive multi-particle states in infinite volume (IR limit) and conformal states, which are approached at zero volume (UV limit). Each state is labeled in the IR by a set of `Bethe Ansatz quantum numbers', while in the UV limit it is characterized primarily by the conformal dimensions of the conformal field creating it. We present explicit conjectures for the UV conformal dimensions corresponding to any IR state in the $\phi_{1,3}$-perturbed minimal models $M(2,5)$ and $M(3,5)$. The conjectures, which are based on a combinatorial interpretation of the Rogers-Ramanujan-Schur identities, are consistent with numerical results obtained previously for low-lying energy levels.
The Many Faces of a Character
Ezer Melzer
Physics , 1993, DOI: 10.1007/BF00761715
Abstract: We prove an identity between three infinite families of polynomials which are defined in terms of `bosonic', `fermionic', and `one-dimensional configuration' sums. In the limit where the polynomials become infinite series, they give different-looking expressions for the characters of the two integrable representations of the affine $su(2)$ algebra at level one. We conjecture yet another fermionic sum representation for the polynomials which is constructed directly from the Bethe-Ansatz solution of the Heisenberg spin chain.
Supersymmetric Analogs of the Gordon-Andrews Identities, and Related TBA Systems
Ezer Melzer
Physics , 1994,
Abstract: The Gordon-Andrews identities, which generalize the Rogers-Ramanujan-Schur identities, provide product and fermionic forms for the characters of the minimal conformal field theories (CFTs) M(2,2k+1). We discuss/conjecture identities of a similar type, providing two different fermionic forms for the characters of the models SM(2,4k) in the minimal series of N=1 super-CFTs. These two forms are related to two families of thermodynamic Bethe Ansatz (TBA) systems, which are argued to be associated with the $\hat{\phi}_{1,3}^{\rm top}$- and $\hat{\phi}_{1,5}^{\rm bot}$-perturbations of the models SM(2,4k). Certain other q-series identities and TBA systems are also discussed, as well as a possible representation-theoretical consequence of our results, based on Andrews's generalization of the Gollnitz-Gordon theorem.
Fermionic Character Sums and the Corner Transfer Matrix
Ezer Melzer
Physics , 1993, DOI: 10.1142/S0217751X94000510
Abstract: We present a ``natural finitization'' of the fermionic q-series (certain generalizations of the Rogers-Ramanujan sums) which were recently conjectured to be equal to Virasoro characters of the unitary minimal conformal field theory (CFT) M(p,p+1). Within the quasi-particle interpretation of the fermionic q-series this finitization amounts to introducing an ultraviolet cutoff, which -- contrary to a lattice spacing -- does not modify the linear dispersion relation. The resulting polynomials are conjectured (proven, for p=3,4) to be equal to corner transfer matrix (CTM) sums which arise in the computation of order parameters in regime III of the r=p+1 RSOS model of Andrews, Baxter, and Forrester. Following Schur's proof of the Rogers-Ramanujan identities, these authors have shown that the infinite-lattice limit of the CTM sums gives what later became known as the Rocha-Caridi formula for the Virasoro characters. Thus we provide a proof of the fermionic q-series representation for the Virasoro characters for p=4 (the case p=3 is ``trivial''), in addition to extending the remarkable connection between CFT and off-critical RSOS models. We also discuss finitizations of the CFT modular-invariant partition functions.
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