Search results for "Alexander"
showing 10 items of 37 documents
Key advantages of the leverage points perspective to shape human-nature relations
2021
This perspective paper synthesises the special issue 'Human-nature connectedness as a leverage point for sustainability transformation'. Based on the articles in this special issue, we aim to foster the operationalisation of the leverage points perspective to shape human-nature relations to enable sustainability transformations. Specifically, we draw on four key advantages of the leverage points perspective: (i) the explicit recognition of deep leverage points; (ii) the ability to examine the interactions between shallow and deep system changes; (iii) the combination of causal and teleological modes of research; and (iv) the ability to function as a methodological boundary object. The contr…
NG2 and GFAP co-expression after differentiation in cells transfected with mutant GFAP and in undifferentiated glioma cells
2020
Introduction: Alexander disease is a rare disorder caused by mutations in the gene coding for glial fibrillary acidic protein (GFAP). In a previous study, differentiation of neurospheres transfected with these mutations resulted in a cell type that expresses both GFAP and NG2. Objective: To determine the effect of molecular marker mutations in comparison to undifferentiated glioma cells simultaneously expressing GFAP and NG2. Methods: We used samples of human glioblastoma (GBM) and rat neurospheres transfected with GFAP mutations to analyse GFAP and NG2 expression after differentiation. We also performed an immunocytochemical analysis of neuronal differentiation for both cell types and dete…
The Links-Gould invariants as generalizations of the Alexander polynomial
2016
In this thesis we focus on the connections that exist between two link invariants: first the Alexander-Conway invariant ∆ that was the first polynomial link invariant to be discovered, and one of the most thoroughly studied since alongside with the Jones polynomial, and on the other hand the family of Links-Gould invariants LGn,m that are quantum link invariants derived from super Hopf algebras Uqgl(n|m). We prove a case of the De Wit-Ishii-Links conjecture: in some cases we can recover powers of the Alexander polynomial as evaluations of the Links-Gould invariants. So the LG polynomials are generalizations of the Alexander invariant. Moreover we give evidence that these invariants should s…
El discurso anticlerical en la construcción de una identidad nacional española republicana (1898-1936)
2002
From the colonial disaster, the anticlericalism was a weapon of the republicans against the Monarchy. In the II Republic old prejudices are emerging just to justify the lay legislation of that moment.<br><br>El anticlericalismo fue un arma de los republicanos contra la Monarquía a partir del desastre colonial. En la II República viejos prejuicios surgen para justificar la legislación laicista del momento.
Un condiscípulo español de Alexander von Humboldt en la Bergakademie de Freiberg: Josef Ricarte y su informe sobre el método de amalgamación de Born …
2004
[ES] Se estudia la labor de Joseph Ricarte, pensionado en París y luego en Centroeuropa, para estudiar el método de amalgamación de Born. El trabajo de Ricarte fue especialmente interesante en la Escuela de minas de Schemnitz, a cargo del profesor Antón Ruprecht, en 1787, aunque también se exponen los viajes de aprendizaje con Andrés Manuel del Río por diversas regiones centroeuropeas (Alta y baja Hungría, Austria, Bohemia,etc...) hasta su llegada a Freiberg, en Sajonia, donde estudiaron con A. Werner y fueron compañeros de Alexander von Humboldt. Acompaña al artículo una disertación de Ricarte sobre las mejoras introducidas por Ruprecht al método del barón de Born.
Detection and visualization of physical knots in macromolecules
2010
Abstract This manuscript provides a pedagogical introduction on how to determine and visualize simple physical knots occurring in polymers, proteins and DNA. We explain how the Alexander polynomial is computed and implemented in a simulation code, and how the structure can be simplified beforehand to save computer time. The concept of knottedness can also be extended in a statistical framework to chains which are not closed. The latter is exemplified by comparing statistics of knots in open random walks and closed random loops.
Pisteis in Comparison: Examples and Enthymemes in the Rhetoric to Alexander and in Aristotle's Rhetoric
2011
Today it is generally accepted that the main differences between the "Rhetoric to Alexander" and Aristotle’s "Rhetoric" depend on the different aims of each work’s author: essentially practical in the first case, theoretical in the second one. The difference is clearly visible in the classification of pisteis (proofs). Our basic assumption is that this difference depends on the two majors elements of novelty in Aristotle's Rhetoric: 1. the introduction in the rhetorical field of the logico-dialectical apparatus (above all, the concept of syllogismos); 2. the consideration of ethos and pathos as entechnoi pisteis. In order to specify this general consideration, the paper focuses on enthymema…
Alexander Chak’s Correspondence – historical and artistic value of the Latvian cultural heritage
2013
Evaluating and grouping the literature historical relics, including the correspondences by letters between famous people, for a ground (base) we could take categories which demonstrate the qualities which have elements from the material world in an anent with a human. The cultural historian Fridrich Waidacher by researching the interconnection and selective values between material and spiritual world classified the evidences of material world in several chapters which are not strictly caged in permanent schemes (patterns). The division was made by taking F. Waidacher conception as a base and researching the correspondence by letters of Latvian poets and cultural workers: The potential value…
Protein knot server: detection of knots in protein structures
2007
KNOTS (http://knots.mit.edu) is a web server that detects knots in protein structures. Several protein structures have been reported to contain intricate knots. The physiological role of knots and their effect on folding and evolution is an area of active research. The user submits a PDB id or uploads a 3D protein structure in PDB or mmCIF format. The current implementation of the server uses the Alexander polynomial to detect knots. The results of the analysis that are presented to the user are the location of the knot in the structure, the type of the knot and an interactive visualization of the knot. The results can also be downloaded and viewed offline. The server also maintains a regul…
Sentieri interrotti. Musicisti europei nel crepuscolo dell'Occidente
2012
Il volume descrive il contesto in cui vedono la luce le due mostre dedicate all’Arte Degenerata (Monaco 1937) e alla Musica Degenerata (Düsseldorf 1938), soffermandosi in modo particolare sui percorsi biografici e artistici di quattro compositori la cui biografia venne sconvolta dalla politica culturale nazista: Franz Schreker, Alexander Zemlinsky, Erich Wolfgang Korngold e Viktor Ullmann. Si tratta di autori di origine ebraica, legati in vario modo alla vita musicale di città come Berlino, Vienna e Praga, assai diversi per formazione e linguaggio, ma tutti travolti da una serie di eventi (l'avvento al potere di Hitler, la guerra, la Shoah) che trasformarono i loro percorsi biografici in al…