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Search Results: 1 - 10 of 115 matches for " Svenja "
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Angelika Epple, Angelika Schaser (Hg.): Gendering Historiography. Beyond National Canons. Frankfurt am Main u.a.: Campus Verlag 2009.
Svenja Kaduk
querelles-net , 2010,
Abstract: The collected volume edited by Angelika Epple and Angelika Schaser offers an international overview of as well as detailed insight into current gender-historical and historiographic research. On the one hand, the contributions expand on the traditional historiographic canon and interrogate, on the other hand, the gender-based decisions for inclusion and exclusion in history scholarship. But this growth in knowledge does not significantly promote the demand for a reformulation of “general” (historiography-)history, which can already be considered traditional in terms of gender history. A first step in this direction might be possible through the formulation of a theory of difference, which can become an analytical framework for a pluralistic “new” narrative. Der Sammelband von Angelika Epple und Angelika Schaser bietet sowohl einen internationalen überblick als auch detaillierte Einblicke in derzeitige geschlechtergeschichtliche und historiografische Forschungen. Die Beitr ge erweitern zum einen den traditionellen historiografischen Kanon und fragen zum anderen nach den geschlechtlichen Grundlagen von In- und Exklusionen in der Geschichtswissenschaft. Dieser Wissenszuwachs treibt aber die nunmehr schon traditionell seitens der Geschlechtergeschichte geforderte Neuformulierung der allgemeinen‘ (Historiografie-)Geschichte nicht merklich voran. Ein erster Schritt in diese Richtung l ge m glicherweise in der Formulierung einer Differenztheorie als analytischem Rahmen für eine pluralistische Neu‘erz hlung.
Gender im Mainstream der Wissenschaft? Gender in the Scientific Mainstream
Svenja Matusall
querelles-net , 2008,
Abstract: Das Thema Wissenschaft und Geschlecht‘ wird derzeit viel diskutiert. Der vorliegende Sammelband stellt hierzu Forschungsvorhaben, Frauenf rderungsprojekte sowie Konzepte aus Qualit tsmanagement und Universit tsverwaltung vor, um einen facettenreichen Einblick in dieses wachende Forschungs- und Politikgebiet zu geben. The theme ’science and gender’ is currently very topical. The collected volume at hand introduces research plans, projects for the promotion of women, and concepts from quality management and university administration in relation to this theme, in order to provide multifaceted insight into this growing area for research and politics.
Social behavior in the “Age of Empathy”?—A social scientist's perspective on current trends in the behavioral sciences
Svenja Matusall
Frontiers in Human Neuroscience , 2013, DOI: 10.3389/fnhum.2013.00236
Abstract: Recently, several behavioral sciences became increasingly interested in investigating biological and evolutionary foundations of (human) social behavior. In this light, prosocial behavior is seen as a core element of human nature. A central role within this perspective plays the “social brain” that is not only able to communicate with the environment but rather to interact directly with other brains via neuronal mind reading capacities such as empathy. From the perspective of a sociologist, this paper investigates what “social” means in contemporary behavioral and particularly brain sciences. It will be discussed what “social” means in the light of social neuroscience and a glance into the history of social psychology and the brain sciences will show that two thought traditions come together in social neuroscience, combining an individualistic and an evolutionary notion of the “social.” The paper concludes by situating current research on prosocial behavior in broader social discourses about sociality and society, suggesting that to naturalize prosocial aspects in human life is a current trend in today's behavioral sciences and beyond.
Similarity and Coincidence Isometries for Modules
Svenja Glied
Mathematics , 2010, DOI: 10.4153/CMB-2011-076-x
Abstract: The groups of (linear) similarity and coincidence isometries of certain modules in d-dimensional Euclidean space, which naturally occur in quasicrystallography, are considered. It is shown that the structure of the factor group of similarity modulo coincidence isometries is the direct sum of cyclic groups of prime power orders that divide d. In particular, if the dimension d is a prime number p, the factor group is an elementary Abelian p-group. This generalizes previous results obtained for lattices to situations relevant in quasicrystallography.
Svenja Adolphs,Ronald Carter
International Journal of English Studies (IJES) , 2003, DOI: 10.6018/ijes.3.1.48491
Abstract: This paper argues for the imporiance of teaching frequent words in English and for using computer corpora as a guide to decisions over which words to teach. The article contains a case study of a word which is frequent in both written and spoken English but more frequent in spoken English. The use of a spoken corpus raises complex questions conceming the teaching of grammar, especially frequent words in a 'discourse grammar' and these are discussed in relation to evidence of contexts of use, the needs of the learner and the use of authentic language data in the foreign language classroom.
Hearing the shape of a triangle
Daniel Grieser,Svenja Maronna
Mathematics , 2012,
Abstract: In 1966 Mark Kac asked the famous question 'Can one hear the shape of a drum?'. While this was later shown to be false in general, it was proved by C. Durso that one can hear the shape of a triangle. After an introduction to the general inverse spectral problem we will give a new proof of this fact. The central point of the argument is to show that area, perimeter and the sum of the reciprocals of the angles determine a triangle uniquely. This is proved using convexity arguments and the partial fraction expansion of $\sin^{-2}x$.
On Maximum Lee Distance Codes
Tim L. Alderson,Svenja Huntemann
Journal of Discrete Mathematics , 2013, DOI: 10.1155/2013/625912
Abstract: Singleton-type upper bounds on the minimum Lee distance of general (not necessarily linear) Lee codes over are discussed. Two bounds known for linear codes are shown to also hold in the general case, and several new bounds are established. Codes meeting these bounds are investigated and in some cases characterised. 1. Introduction The Lee metric was introduced by Lee [1] in 1958 as an alternative to the Hamming metric for certain noisy channels. It found application and in particular was later developed for certain noisy channels (primarily those using phase-shift keying modulation [2]). The past decade has witnessed a burst of new and varied applications for codes defined in the Lee metric (Lee codes) including constrained and partial-response channels [3], interleaving schemes [4], orthogonal frequency-division multiplexing [5], multidimensional burst-error correction [6], and error correction for flash memories [7]. These recent applications give increased interest in questions surrounding optimal Lee codes. Similar to the case of the Hamming metric, it is desirable to investigate upper bounds on the minimum Lee distance of a code given the code size, code length, and alphabet size. Codes meeting these bounds are of special interest as they are optimal in the sense that their minimum distance is largest. Under the Hamming metric, such codes are referred to as maximum distance separable (MDS) codes. Under the Lee metric, such codes may be referred to as Maximum Lee Distance Separable (MLDS) codes. Here, we will present several upper bounds similar to the Singleton bound and investigate the existence question of MLDS codes. In certain cases, we are able to completely characterize MLDS codes. 2. Preliminaries An block code is a collection of -tuples (codewords) over an alphabet of size such that the minimum (Hamming) distance between any two codewords is (hence, no two codewords have as many as common coordinates). Here, is the dimension of , which need not be an integer. Where context demands, we may also denote the Hamming distance by . The Singleton bound states that and holds for all block codes. Codes meeting this bound with equality are called maximum distance separable (MDS) codes. Research on both linear and nonlinear MDS codes has been extensive (e.g., see [8–10] and references therein). 2.1. Lee Codes Let be the set of representatives of the integer equivalence classes modulo . The Lee weight of any element is given by . Given an element , the Lee weight of , denoted , is given by For , the Lee distance between and is defined to be the Lee
Dual Targeting and Retrograde Translocation: Regulators of Plant Nuclear Gene Expression Can Be Sequestered by Plastids
Kirsten Krause,Svenja Oetke,Karin Krupinska
International Journal of Molecular Sciences , 2012, DOI: 10.3390/ijms130911085
Abstract: Changes in the developmental or metabolic state of plastids can trigger profound changes in the transcript profiles of nuclear genes. Many nuclear transcription factors were shown to be controlled by signals generated in the organelles. In addition to the many different compounds for which an involvement in retrograde signaling is discussed, accumulating evidence suggests a role for proteins in plastid-to-nucleus communication. These proteins might be sequestered in the plastids before they act as transcriptional regulators in the nucleus. Indeed, several proteins exhibiting a dual localization in the plastids and the nucleus are promising candidates for such a direct signal transduction involving regulatory protein storage in the plastids. Among such proteins, the nuclear transcription factor WHIRLY1 stands out as being the only protein for which an export from plastids and translocation to the nucleus has been experimentally demonstrated. Other proteins, however, strongly support the notion that this pathway might be more common than currently believed.
Full mitochondrial genome sequences of two endemic Philippine hornbill species (Aves: Bucerotidae) provide evidence for pervasive mitochondrial DNA recombination
Svenja Sammler, Christoph Bleidorn, Ralph Tiedemann
BMC Genomics , 2011, DOI: 10.1186/1471-2164-12-35
Abstract: Here we present the first complete mt genome of the avian family Bucerotidae, i.e., that of two Philippine hornbills, Aceros waldeni and Penelopides panini. The mt genomes are characterized by a tandemly duplicated region encompassing part of cytochrome b, 3 tRNAs, NADH6, and the control region. The duplicated fragments are identical to each other except for a short section in domain I and for the length of repeat motifs in domain III of the control region. Due to the heteroplasmy with regard to the number of these repeat motifs, there is some size variation in both genomes; with around 21,657 bp (A. waldeni) and 22,737 bp (P. panini), they significantly exceed the hitherto longest known avian mt genomes, that of the albatrosses. We discovered concerted evolution between the duplicated fragments within individuals. The existence of differences between individuals in coding genes as well as in the control region, which are maintained between duplicates, indicates that recombination apparently occurs frequently, i.e., in every generation.The homogenised duplicates are interspersed by a short fragment which shows no sign of recombination. We hypothesize that this region corresponds to the so-called Replication Fork Barrier (RFB), which has been described from the chicken mitochondrial genome. As this RFB is supposed to halt replication, it offers a potential mechanistic explanation for frequent recombination in mitochondrial genomes.Since Desjardins and Morais [1] have presented the mt gene organization of the domestic chicken (Gallus gallus), it is known that birds possess a different gene order compared to other vertebrates. While the chicken gene order was found in many other avian taxa as well, Mindell et al. [2], Eberhard et al. [3], Abbott et al. [4], and Verkuil et al. [5] subsequently presented alternate avian mt gene orders and discussed their potential origin. Gibb et al. [6] suggested a conversion scenario for avian species according to the tandem duplicatio
Infection of cells expressing CXCR4 mutants lacking N-glycosylation at the N-terminal extracellular domain is enhanced for R5X4-dualtropic human immunodeficiency virus type-1
Ingo Thordsen, Svenja Polzer, Michael Schreiber
BMC Infectious Diseases , 2002, DOI: 10.1186/1471-2334-2-31
Abstract: The two CXCR4 N-glycosylation sites g1 (NYT) and g2 (NVS) were mutated by changing the first or third amino acids N or T/S to Q and A respectively (g1; N11Q or T13A; g2, N176Q or S178A). Human osteosarcoma cells (GHOST) expressing human CD4 and the various CXCR4 glycosylation mutants were tested for infection using NL4-3-based viruses with X4, R5 or R5X4-tropism differing only in the V3 loop region.All constructed cell lines expressing the various CXCR4 glycomutants showed similar permissiveness for the X4-monotropic virus and no change in the coreceptor specificity that allows infection of a CCR5-dependent R5-monotropic virus. Interestingly, the removal of glycan g1 significantly enhanced the permissiveness of GHOST cells for the R5X4 dualtropic virus. GHOST cells expressing the CXCR4-g1 or CXCR4-g1/2 mutants were infected at higher rates by the R5X4-dualtropic virus compared to cells expressing CXCR4-wt or CXCR4-g2 coreceptors.Our present observations underscore a role for glycans present on the CXCR4 coreceptor in the entry process of HIV-1. The data will help to better understand the multifaceted mechanism of HIV infection and the selective forces which drive HIV-1 evolution from mono- to dual-tropism.The chemokine receptor CXCR4 belongs to the seven-transmembrane-domain G-protein-coupled receptor family and is one of the major coreceptors for human immunodeficiency virus type 1 (HIV-1) [1,2]. The trimolecular interaction between the HIV-1 receptor CD4, CXCR4 and viral envelope proteins (gp120/gp41) is the first step in HIV entry. Binding of gp120 to CD4 triggers conformational changes responsible for binding to the coreceptor. Binding to coreceptor is followed by further conformational changes in the gp41 subunit which lead to membrane fusion [3-5]. The N-terminal region and extra cellular domains of CXCR4 are of particular importance for the interaction with the third variable loop (V3) of HIV-1 gp120 [6-8]. While HIV-1 infection is dependent on the interactio
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