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Search Results: 1 - 10 of 401433 matches for " M. Goldmann "
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Techniques of DNA-studies on prehispanic ectoparasites (Pulex sp., Pulicidae, Siphonaptera) from animal mummies of the Chiribaya Culture, Southern Peru
Dittmar K,Mamat U,Whiting M,Goldmann T
Memórias do Instituto Oswaldo Cruz , 2003,
Abstract: During a paleoparasitological survey of several animal mummies (Cavia aperea f. porcellus and Canis familiaris) from Chiribaya Baja, an archaeological site in Southern Peru, an unexpected find was made. In the well preserved fur, large numbers of mummified fleas (Pulex simulans/irritans)that parasitized the animals during life were encountered. Due to the relative recent event of the host mummification and the outstanding preservation of the fleas, an attempt for the retrieval of DNA was made. A DNA extraction and sequencing protocol for archaeological ectoparasitic remains has been established, taking additional studies for tissue and protein preservation into account. Tissue preservation was assessed with transmission electron microscopy and the protein preservation was tested through the racemisation ratios of aspartic acid. Regions of the 28S rDNA gene were successfully amplified and sequenced. Further research perspectives are outlined.
A Quantum of Solace: Guzman on the Classical Mechanics of International Law - Book Review: Andrew Guzman, How International Law Works. A Rational Choice Theory (2008)
Matthias Goldmann
G?ttingen Journal of International Law , 2009,
Abstract: Compared to the discipline of international law, scholars of physics are blessed. While the principles of classical mechanics were theorized several centuries ago, quantum theory and the theory of relativity offer supplementary ways for describing how material objects and energy interact where classical mechanics does not provide an explanation. Thus, even in the absence of an all-comprising “world theory”, physicists have a wide array of workable theories at their service. By contrast, the “classical mechanics” of international law, i.e. the explanation of the most basic causal relationships between international legal norms and the behaviour of states as the main subjects of international law, are still subject to deep theoretical controversies. International legal doctrine presupposes that international law does have an impact and does not aim at questioning or further explaining this assumption. Traditional legal theories that see the essence of legal normativity in the possibility to trigger mechanisms of physical constraint often come to the conclusion that international law, in the absence of central enforcement mechanisms, is at best a primitive form of law. More recent enquiries into international legal theory from very different theoretical angles come to even less uplifting conclusions. Some argue that international legal norms are either entirely devoid of content because of their inherent indeterminacy and therefore prone to be capture
The Measurement of Acculturation
Gustave Goldmann
Canadian Studies in Population , 1998,
Abstract:
Intra-Generational Ethnic Flows: Ethnic Mobility in the Canadian Census: Presidential address CPS annual meeting, 2008
Goldmann, Gustave
Canadian Studies in Population , 2009,
Abstract: This article extends the study of ethnic mobility by examining intra-generationalflows in ethnicity in Canadian census data. It expands on previous work on thistopic that focused specifically on Aboriginal Peoples. This paper establishes,through an analysis of census data from 1991 to 2001, that population flowsexist among selected ethnic groups in Canada that can only be explained byethnic mobility (or transfer). It also raises concerns about deriving trends overtime in analysing population groups defined by ethno-cultural characteristics. Résumé Cet article approfondi l’étude de la mobilité ethnique en examinant lesmouvements intergénérationnels des groupes ethniques en s’appuyant sur lesdonnées de recensement du Canada. L’article ajoute aux recherches qui existentdéjà sur ce sujet et qui sont spécifiquement centrées sur les peuples autochtones.Cet article établit, par une analyse des données de recensement entre 1991 et2001, que les mouvements de populations existent bel et bien parmi certainsgroupes ethniques au Canada et ne peuvent être expliqués que par la mobilité(ou transfert) ethnique. Il soulève aussi des préoccupations quant à la dérivationdes tendances au fil du temps pour les analyses de groupes de populations quisont définis par des caractéristiques ethnoculturelles.
Ordered interfaces for dual easy axes in liquid crystals
Emmanuelle Lacaze,A Apicella,M De Santo,D Coursault,M Alba,M Goldmann,R Barberi
Physics , 2015, DOI: 10.1039/C0SM00727G
Abstract: Using nCB films adsorbed on MoS 2 substrates studied by x-ray diffraction, optical microscopy and Scanning Tunneling Microscopy, we demonstrate that ordered interfaces with well-defined orientations of adsorbed dipoles induce planar anchoring locked along the adsorbed dipoles or the alkyl chains, which play the role of easy axes. For two alternating orientations of the adsorbed dipoles or dipoles and alkyl chains, bi-stability of anchoring can be obtained. The results are explained using the introduction of fourth order terms in the phenomenological anchoring potential, leading to the demonstration of first order anchoring transition in these systems. Using this phenomenological anchoring potential, we finally show how the nature of anchoring in presence of dual easy axes (inducing bi-stability or average orientation between the two easy axes) can be related to the microscopical nature of the interface. Introduction Understanding the interactions between liquid crystal (LC) and a solid substrate is of clear applied interest, the vast majority of LC displays relying on control of interfaces. However this concerns also fundamental problems like wetting phenomena and all phenomena of orientation of soft matter bulk induced by the presence of an interface. In LCs at interfaces, the so-called easy axes correspond to the favoured orientations of the LC director close to the interface. If one easy axis only is defined for one given interface, the bulk director orients along or close to this axis [1]. It is well known that, in anchoring phenomena, two major effects compete to impose the anchoring directions of a liquid crystal, first, the interactions between molecules and the interface, second, the substrate roughness whose role has been analyzed by Berreman [2]. The influence of adsorbed molecular functional groups at the interface is most often dominant with, for example in carbon substrates, a main influence of unsaturated carbon bonds orientation at the interface [3]. In common LC displays, there is one unique easy axis, but modifications of surfaces have allowed for the discovery of promising new anchoring-related properties. For instance, the first anchoring bi-stability has been established on rough surfaces, associated with electric ordo-polarization [4] and the competition between a stabilizing short-range term and a destabilizing long-range term induced by an external field, can induce a continuous variation of anchoring orientation [5]. More recently, surfaces with several easy axes have been studied extensively. It has been shown that control of a
Microscopic measurement of the linear compressibilities of two-dimensional fatty acid mesophases
C. Fradin,J. Daillant,A. Braslau,D. Luzet,M. Alba,M. Goldmann
Physics , 1997, DOI: 10.1007/s100510050152
Abstract: The linear compressibility of two-dimensional fatty acid mesophases has determined by grazing incidence x-ray diffraction. Surface pressure vs molecular area isotherms were reconstructed from these measurements, and the linear compressibility (relative distortion along a given direction for isotropic applied stress) was determined both in the sample plane and in a plane normal to the aliphatic chain director (transverse plane). The linear compressibilities range over two orders of magnitude from 0.1 to 10 m/N and are distributed depending on their magnitude in 4 different sets which we are able to associate with different molecular mechanisms. The largest compressibilities (10m/N) are observed in the tilted phases. They are apparently independent of the chain length and could be related to the reorganization of the headgroup hydrogen-bounded network, whose role should be revalued. Intermediate compressibilities are observed in phases with quasi long-range order (directions normal to the molecular tilt in L_2 or L_2' phases, S phase), and could be related to the ordering of these phases. The lowest compressibilities are observed in the solid untilted CS phase and for 1 direction of the S and L_2'' phases. They are similar to the compressibility of crystalline polymers and correspond to the interactions between methyl groups in the crystal. Finally, negative compressibilities are observed in the transverse plane for L_2' and L_2'' phases and can be traced to subtle reorganizations upon untilting.
Lifetime of d-holes at Cu surfaces: Theory and experiment
A. Gerlach,K. Berge,A. Goldmann,I. Campillo,A. Rubio,J. M. Pitarke,P. M. Echenique
Physics , 2001, DOI: 10.1103/PhysRevB.64.085423
Abstract: We have investigated the hole dynamics at copper surfaces by high-resolution angle-resolved photoemission experiments and many-body quasiparticle GW calculations. Large deviations from a free-electron-like picture are observed both in the magnitude and the energy dependence of the lifetimes, with a clear indication that holes exhibit longer lifetimes than electrons with the same excitation energy. Our calculations show that the small overlap of d- and sp-states below the Fermi level is responsible for the observed enhancement. Although there is qualitative good agreement of our theoretical predictions and the measured lifetimes, there still exist some discrepancies pointing to the need of a better description of the actual band structure of the solid.
Pairing evidence of 8CB molecules adsorbed on MoS2: Influence of 2D commensurability on the intralamellar structure
E. Lacaze,M. Alba,M. Goldmann,J. P. Michel,F. Rieutord
Physics , 2000,
Abstract: By combining X-ray diffraction studies under grazing incidence (GIXD) and Scanning Tunneling Microscopy (STM) measurements, we have precisely determined the structure of 8CB molecules adsorbed on MoS2, under the thick organic film. The commensurability of the adsorbed network and the intracell structure have been determined, revealing a complex structure characterized by a non-equivalence of adjacent lamellae with pair associations of molecules in one lamella over two. We have interpreted such a result by a simple model of a single lamella. This pair association in one lamella over two appears as a direct evidence of the connection between the commensurabilities in the two directions. The value of the molecule-substrate potential corrugations is particularly high, indicating that the dipolar momentum of 8CB molecules could play a fundamental role in the molecule-substrate interactions
Hole dynamics in noble metals
I. Campillo,A. Rubio,J. M. Pitarke,A. Goldmann,P. M. Echenique
Physics , 2000, DOI: 10.1103/PhysRevLett.85.3241
Abstract: We present a detailed analysis of hole dynamics in noble metals (Cu and Au), by means of first-principles many-body calculations. While holes in a free-electron gas are known to live shorter than electrons with the same excitation energy, our results indicate that d-holes in noble metals exhibit longer inelastic lifetimes than excited sp-electrons, in agreement with experiment. The density of states available for d-hole decay is larger than that for the decay of excited electrons; however, the small overlap between d- and sp-states below the Fermi level increases the d-hole lifetime. The impact of d-hole dynamics on electron-hole correlation effects, which are of relevance in the analysis of time-resolved two-photon photoemission experiments, is also addressed.
Techniques of DNA-studies on prehispanic ectoparasites (Pulex sp., Pulicidae, Siphonaptera) from animal mummies of the Chiribaya Culture, Southern Peru
Dittmar, K;Mamat, U;Whiting, M;Goldmann, T;Reinhard, K;Guillen, S;
Memórias do Instituto Oswaldo Cruz , 2003, DOI: 10.1590/S0074-02762003000900010
Abstract: during a paleoparasitological survey of several animal mummies (cavia aperea f. porcellus and canis familiaris) from chiribaya baja, an archaeological site in southern peru, an unexpected find was made. in the well preserved fur, large numbers of mummified fleas (pulex simulans/irritans)that parasitized the animals during life were encountered. due to the relative recent event of the host mummification and the outstanding preservation of the fleas, an attempt for the retrieval of dna was made. a dna extraction and sequencing protocol for archaeological ectoparasitic remains has been established, taking additional studies for tissue and protein preservation into account. tissue preservation was assessed with transmission electron microscopy and the protein preservation was tested through the racemisation ratios of aspartic acid. regions of the 28s rdna gene were successfully amplified and sequenced. further research perspectives are outlined.
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