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Search Results: 1 - 10 of 624 matches for " Silke Potthast "
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Annular pancreas associated with duodenal carcinoma
Enrico Br?nnimann, Silke Potthast, Tatjana Vlajnic, Daniel Oertli, Oleg Heizmann
World Journal of Gastroenterology , 2010,
Abstract: Annular pancreas (AP) is a rare congenital anomaly. Coexisting malignancy has been reported only in a few cases. We report what is, to the best of our knowledge, the first case in the English literature of duodenal adenocarcinoma in a patient with AP. In a 55-year old woman with duodenal outlet stenosis magnetic resonance cholangiopancreatography showed an aberrant pancreatic duct encircling the duodenum. Duodenojejunostomy was performed. Eight weeks later she presented with painless jaundice. Duodenopancreatectomy revealed a duodenal adenocarcinoma, surrounded by an incomplete AP. Thus, co-existent malignancy with AP can be present without obstructive jaundice and without being visible through preoperative diagnostics.
Review: Francisco Solano López and the Ruination of Paraguay: Honor and Egocentrism, by James Schofield Saeger
Barbara Potthast
Journal of Historical Biography , 2008,
Abstract:
Algo más que heroínas: varias roles y memorias femeninas de la guerra de la triple alianza Algo mais que heroínas: as diferentes fun es e memórias femininas da guerra da tríplice alian a
Barbara Potthast
Diálogos , 2010, DOI: 10.4025/dialogos.v10i1.115
Abstract: La guerra de la Triple Alianza o del Paraguay fue una de las contiendas más largas y sangrientas de América Latina, fundamentalmente para Paraguay que perdió alrededor de la mitad de su población y gran parte del territorio tras su derrota. Sin embargo, en el Paraguay del siglo XX, la guerra fue conmemorada como “la epopeya nacional” en la que todo el pueblo (tanto hombres como mujeres) se destacó por su patriotismo y valor. Sin embargo, más que los hombres caídos, fueron las mujeres que supuestamente tomaron las armas al final de la guerra para defender la patria, las que adquirieron la categoría de heroínas nacionales. Recién en los últimos a os, surgieron otras memorias y perspectivas de la guerra y del rol de las mujeres paraguayas. Si bien es cierto que éstas desempe aron papeles muy importantes durante el conflicto armado, sobre todo en su fase tardía, también fueron víctimas de la creciente tiranía del presidente Francisco Solano López. Durante mucho tiempo, la memoria oficial sólo recordó a las “residentas” que acompa aron al ejército hasta el final y que pelearon contra los aliados cuando ya no quedaban soldados para protegerlas. Por su parte, la oposición liberal (tanto contemporánea como posterior) resaltó los sufrimientos de las mujeres “destinadas”, o sea, de las prisioneras reunidas en campos de concentración en las zonas fronterizas. El objetivo de esta oposición liberal no era presentar otra perspectiva sobre los roles femeninos sino más bien reforzar la crítica al régimen de López y a otros regímenes autoritarios de Paraguay. En este artículo, serán analizadas las diferentes actividades femeninas durante la guerra (ya sean voluntarias o forzadas) como algunas fuentes que nos puedan dar una perspectiva diferente, para después explicar por qué los paraguayos privilegiaron la memoria de las “residentas” por sobre la de las “destinadas” e, incluso, sobre la de los veteranos. A guerra da Tríplice Alian a ou do Paraguai foi uma das contendas mais longas e sangrentas da América Latina, em particular para o Paraguai que perdeu cerca da metade de sua popula o e grande parte do território após sua derrota. Porém, no Paraguai do século XX, a guerra foi comemorada como “a epopéia nacional”, em que todo o povo – tanto homens como mulheres – destacou-se pelo seu patriotismo e valor. Entretanto, mais que os homens caídos, foram as mulheres que supostamente pegaram em armas no fim da guerra para defender a pátria, as que adquiriram a categoria de heroínas nacionais. Só nos últimos anos é que surgiram outras memórias e perspectivas sobre a guerra e o pa
A Minimal Off-Lattice Model for Alpha-helical Proteins
Frank Potthast
Physics , 1998,
Abstract: A minimal off-lattice model for alpha-helical proteins is presented. It is based on hydrophobicity forces and sequence independent local interactions. The latter are chosen so as to favor the formation of alpha-helical structure. They model chirality and alpha-helical hydrogen bonding. The global structures resulting from the competition between these forces are studied by means of an efficient Monte Carlo method. The model is tested on two sequences of length N=21 and 33 which are intended to form 2- and 3-helix bundles, respectively. The local structure of our model proteins is compared to that of real alpha-helical proteins, and is found to be very similar. The two sequences display the desired numbers of helices in the folded phase. Only a few different relative orientations of the helices are thermodynamically allowed. Our ability to investigate the thermodynamics relies heavily upon the efficiency of the used algorithm, simulated tempering; in this Monte Carlo approach, the temperature becomes a fluctuating variable, enabling the crossing of free-energy barriers.
Review: Charles Tilly (2006). Why? What Happens When People Give Reasons … And Why Review: Charles Tilly (2006). Why? What Happens When People Give Reasons … And Why Rese a: Charles Tilly (2006). Why? What Happens When People Give Reasons … And Why
J?rg Potthast
Forum : Qualitative Social Research , 2008,
Abstract: Es steht au er Frage, dass wir uns best ndig rechtfertigen oder Rechtfertigungen entgegennehmen. Doch es ist wenig darüber bekannt, wie Rechtfertigungen eigentlich funktionieren. Der New Yorker Soziologe Charles TILLY (1929-2008) stellt fest, dass diese Frage und ihre methodischen Implikationen in der sozial- und geschichtswissenschaftlichen Forschung zu wenig Beachtung gefunden haben. Er hat darum ein Buch mit dem Titel "Why?" geschrieben. Gibt es einen Zwang zur Rechtfertigung? Wenn ja, wie wird dieser aktiviert? Wie kommen Rechtfertigungen zustande? Wie werden Situationen, die Rechtfertigungen enthalten, zum Abschluss gebracht? TILLY argumentiert, dass Operationen der Rechtfertigung unterschiedliche Formen annehmen und unterscheidet vier Formate: Rechtfertigungen stützen sich auf Konventionen (S.32-60), Geschichten (S.61-95), Gesetze und Vorschriften (S.96-125) sowie technische Expertisen (S.126-156). TILLY hat jedem dieser Formate ein eigenes Kapitel gewidmet, behauptet aber, dass alle vier Typen von Rechtfertigung eine Gemeinsamkeit aufweisen. Welches Format Rechtfertigungen auch annehmen, sie lassen sich stets als "Praktiken" beschreiben und verweisen auf "soziale Beziehungen". Weder seien Praktiken und soziale Beziehungen durch Rechtfertigungen determiniert, noch umgekehrt. URN: urn:nbn:de:0114-fqs0901135 While it is clear that we are constantly giving as well as receiving justifications, it is less clear how justification works. New York sociologist Charles TILLY (1929-2008) claims that both social scientists and historians have failed to properly address this question and to develop on its methodological implications. Therefore, he has written a book on "why?". Is there an imperative to justify? If there is, how is it activated? How do justifications emerge? How do situations which have justification come to an end? TILLY argues that operations of justification take a variety of forms and he distinguishes four different formats justification can take: Justifications are given in terms of conventions (pp.32-60), stories (pp.61-95), codes (pp.96-125), and technical accounts (pp.126-156). While TILLY has chosen to highlight these different forms throughout the main chapters of his book, he maintains that all types of justifications have something in common. Whatever form justifications may take, they always relate to "practices" and "social relations." This implies that neither practices nor relations determine justifications (and vice versa). URN: urn:nbn:de:0114-fqs0901135 Mientras que es claro que estamos constantemente dando así como recibiendo
Der Nachlass Robert Lehmann-Nitsche. Erschlie ung und Bearbeitung eines medial breit gef cherten Bestands
Potthast, Barbara,Reinert, Kathrin
Zeitenblicke , 2008,
Abstract:
Editorial
Potthast, Barbara,Juneja, Monica
Zeitenblicke , 2008,
Abstract:
Binary Assignments of Amino Acids from Pattern Conservation
Anders Irb?ck,Frank Potthast
Physics , 1996,
Abstract: We develop a simple optimization procedure for assigning binary values to the amino acids. The binary values are determined by a maximization of the degree of pattern conservation in groups of closely related protein sequences. The maximization is carried out at fixed composition. For compositions approximately corresponding to an equipartition of the residues, the optimal encoding is found to be strongly correlated with hydrophobicity. The stability of the procedure is demonstrated. Our calculations are based upon sequences in the SWISS-PROT database.
Studies of an Off-Lattice Model for Protein Folding: Sequence Dependence and Improved Sampling at Finite Temperature
Anders Irb?ck,Frank Potthast
Physics , 1995, DOI: 10.1063/1.469931
Abstract: We study the thermodynamic behavior of a simple off-lattice model for protein folding. The model is two-dimensional and has two different ``amino acids''. Using numerical simulations of all chains containing eight or ten monomers, we examine the sequence dependence at a fixed temperature. It is shown that only a few of the chains exist in unique folded state at this temperature, and the energy level spectra of chains with different types of behavior are compared. Furthermore, we use this model as a testbed for two improved Monte Carlo algorithms. Both algorithms are based on letting some parameter of the model become a dynamical variable; one of the algorithms uses a fluctuating temperature and the other a fluctuating monomer sequence. We find that by these algorithms one gains large factors in efficiency in comparison with conventional methods.
Sequence Dependence in an Off-Lattice Model for Protein Folding
Anders Irb?ck,Frank Potthast
Physics , 1995,
Abstract: See chem-ph/9505003.
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