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Tumor cell plasticity is an event that has been observed in several malignancies. In fact, most of the solid tumors are characterized by cellular heterogeneity and undergo constant changes as the tumor develops. The increased plasticity displayed by these cells allows them to acquire additional properties, enabling epithelial-mesenchymal transitions, dedifferentiation and the acquisition of stem cell-like properties. Here we discuss the particular importance of an inflammatory microenvironment for the bidirectional control of cellular plasticity and the potential for therapeutic intervention.
Within the nucleosynthetic processes of the slow neutron-capture reaction network (called the s process) the so called branching points, unstable isotopes where different nuclear reactions are competing, are important to understand . For modeling and calculating the nucleosynthesis and compare the resulting abundances to the observed ones, it is indispensable to know the branching ratios as well as the corresponding cross sections.
A great challenge in measuring those rates in experiments may be the radioactivity of the isotopes involved, which can make it nearly impossible to manufacture the needed targets. In addition, in stellar environments the excited states of isotopes can be in equilibrium with the ground state, affecting the half-lives and the branching ratios significantly. The isotope 152Eu is such a branching point, with neutron captures and β-decays competing. Those challenges were approached in the s405 experiment performed at the GSI Helmholtzzentrum für Schwerionenforschung GmbH: the challenge the challenge of the radioactivity can be approached by experiments carried out in inverse kinematics with radioactive beams, solving the problem of unstable targets. Also a reversed reaction was used to access the excited states of the studied isotope. The performed 152Sm(p,n)152Eu is a pioneering attempt to use those methods on heavy ions. The (p,n) reaction was used as a substitute for electron capture, the focus lies on reactions with low-momentum transfers, resulting in the emission of low-energy neutrons. The new developed low-energy detector array LENA was put to test for the fist time in the s405 experiment.
In the 20th century, the term "ecosystem" was one of the most important concepts for the biological discipline "ecology." Originally coined by the English botanist Arthur G. Tansley in an article from 1935, it is now a well-established term. The authors of the textbook 'Ecology' write, the ecosystem concept "has become a powerful tool for integrating ecology with other disciplines." But this only addresses the scientific resonance of the term. In the 1970s "ecosystem" also became an important concept for the environmental movement, for the term "ecosystem" describes nature as a whole entity, in which all things are linked together, forming a network of biotic and abiotic factors. In this sense, the "ecosystem" concept also took on a key role in the political ecology discourse. This article begins with a look at the political ecology discourse, and then focuses on the formation of the "ecosystem" concept. The terminological development of the term turns first to the linguistic definition of "ecosystem" before looking how the ecosystem became an established concept by transforming the object "lake" into the scientific object "ecosystem." Sections four and five further pursue the role of the ecosystem concept in the environmental discourse, based on the metaphor of "spaceship earth" on the one hand and of the "closing circle" on the other. Finally, the article contextualizes the "ecosystem" concept in conjunction with Claude Lefort's concept of "the political." As we will see, the political impact of the "ecosystem" concept inheres in the very term itself for it describes a wholeness that human beings are inevitably a part of even as their actions alter or disturb with the ecosystem fundamentally. In other words, human beings are both inside and outside of the "ecosystem" at the same time. This paradoxical situation is inevitably constituted by the concept "ecosystem", which is understood as a (nearly) closed system. Hence solutions to environmental problems aim at reintegrating human beings into the closed circle of the global ecosystem through technical constructions or through adapting to natural processes.
We investigate the relationship between anchoring and the emergence of bubbles in experimental asset markets. We show that setting a visual anchor at the fundamental value (FV) in the first period only is sufficient to eliminate or to significantly reduce bubbles in laboratory asset markets. If no FV-anchor is set, bubble-crash patterns emerge. Our results indicate that bubbles in laboratory environments are primarily sparked in the first period. If prices are initiated around the FV, they stay close to the FV over the entire trading horizon. Our insights can be related to initial public offerings and the interaction between prices set on pre-opening markets and subsequent intra-day price dynamics.
Textures
(2014)
Textkompetenz in mehreren Sprachen : Forschungsergebnisse und weiterführende Forschungsansätze
(2014)
The article presents results of an empirical study which examines productive transfer in the area of text skills competence and the associated writing skill which could be attributed to the learners' contact with several languages. The research was conducted within the research project "Multilingualism in the Czech Republik: Learning and Teaching German after English." After a short presentation of the key concepts in the development of the study and a presentation of selected results, implications and a modell for further research in multilingual writing and on transfer processes between languages are introduced.
Zu Karl dem Kühnen gibt es sowohl einen Berner Bezug als auch einen Malte-Bezug. Der Schweizer oder Berner Bezug ist, daß der "Fall" Karls des Kühnen, sein "Untergang", wie es in den "Aufzeichnungen des Malte Laurids Brigge" heißt, entscheidend
vorbereitet wurde durch zwei Schlachten, die er gegen die Eidgenossen verloren hatte, bei Grandson und Murten, nicht weit von Bern, beide 1476. Im "Malte Laurids Brigge" spielen diese Schlachten zwar keine Rolle (auch die Schlacht
bei Nancy, von Anfang Januar 1477, die den Fall und den Tod Karls brachte, interessiert nur in ihren Folgen), es wird aber mit den "Hörnern von Uri" auf diese Ereignisse und deren zentrale Bedeutung angespielt. Der zweite Schweizer oder
Berner Bezug sind die Teile der Burgunder Beute, die mit dem Lager der Feinde bei Grandson in die Hände der Sieger gefallen waren und die zum Teil im Historischen Museum in Bern aufbewahrt werden.
Text und Experiment : die Experimentalszene als mediale Konfiguration im Werk E. T. A. Hoffmanns
(2014)
Im literarischen Werk E.T.A. Hoffmanns nimmt das Experiment eine besondere Stellung ein. Wissenschaftliche oder parawissenschaftliche - auch alchemistische - Experimente kommen in seinem OEuvre an vielen Stellen explizit zur Sprache. In der zweiten Vigilie des bekannten 'Goldenen Topf', beispielsweise stellt der Registrator Heerbrand den geheimen Archivarius Lindhorst zunächst als einen "experimentierenden Chemiker" vor. In dem Märchen 'Klein Zaches genannt Zinnober' unternimmt der Professor Mosch Terpin so manch "physikalisches Experiment". In den Gesprächen der Serapions-Brüder ist unter anderem vom "Experiment" des Magnetismus die Rede, und in der späten Erzählung 'Der Elementargeist' kommt es noch zu einem sehr ausgiebig beschriebenen "Experiment". Dies sind lediglich vereinzelte Beispiele, die einen ersten Einblick bieten. Das "Experiment" an sich stellt ein rekurrentes Motiv des Gesamtwerks Hoffmanns dar. Wie lässt sich diese Präsenz und Prägnanz des Experimentalmoments kontextualisieren? Wie lässt sie sich begründen? Und zunächst auch: Welche Verbindungen ergeben sich genereller aus dem Zusammenhang von Literatur und Experiment?
Mit der Konstellation "Text und Experiment" ist ein Themenfeld bezeichnet, das als Schnittfläche zwischen wissenschaftsgeschichtlichen und literaturhistorischen Fragestellungen heute kein unerforschtes Gebiet darstellt. Zu den Verbindungen zwischen Experiment und literarischer Konfiguration liegt mit dem von Michael Gamper herausgegebenen Band 'Experiment und Literatur' sowie der grundlegenden, dreibändigen literaturgeschichtlichen Buchfolge zu dem Thema inzwischen eine imposante Reihe wissenschaftlicher Werke vor. Die genannten Bände stecken Grundlagen ab, liefern Einzelanalysen und geben darüber hinaus Impulse und Anregungen für die weitere Beschäftigung mit dem Gegenstand.
In the title compound, C40H76Si, the Si atom is located on a special position of site symmetry -4. Thus, there is just a quarter of a molecule in the asymmetric unit. The C=C double bonds exhibit a trans configuration. The Si atom and the tert-butyl group are located on the same side of the plane formed by the C=C double bond and its four substituents. The crystal packing shows no short contacts between the molecules and despite the low crystal density (0.980 Mg m−3), there are no significant voids in the structure.