1,103 research outputs found
Irenicum Numae Pompilii, cum Hippocrate : quo veterum Medicorum & Philosophorum Hypotheses in Corpus Iuris Civilis pariter, ac Canonici, hactenus trans-sumtae / a praeconceptis Opinionibus vindicantur Mediatore D.P.A. Prof. Publ. Opus ICtis pariter, atq[ue] Medicis, utile, utpote in quo quaestiones propositae ex ipsis legum textibus, & variis responsis Facultatis Medicae Lipsiensis illustrantur
No full textVideos | ‘African Cities and the Development Conundrum’ by Carole Ammann and Till Förster, Guest-Editors
No full textThe Special Issue is available in Open Access! Ammann, C. and T. Förster (Eds.) (2018) African Cities and the Development Conundrum, International Development Policy Series, No.10 (Geneva, Boston: Graduate Institute Publications, Brill-Nijhoff). https://youtu.be/zib46riA6iY Carole Ammann, guest editor for this edition and lecturer at the Institute of Social Anthropology in Basel, identifies the problems with growing inequalities as a result of rapid urbanisation in the African continent. ..
Today’s vegetation and woody flora
No full textConsidered over long time scales, today's vegetation is only the last realization of a dynamic process and not a static concept. On the one hand, knowledge of modern vegetation is essential for our understanding of vegetation history, on the other hand, considering this history allows a deeper understanding of the present vegetation. In Europe this comparison is made difficult because of the human impact on the environment over millennia: what we observe as the modern plant cover is only rarely the end product of a natural vegetation history.
A distinction was often made between ‘modern natural vegetation’ (plant cover without any human impact) and ‘modern potential natural vegetation’ (plant cover including human impact but as it would be after the cessation of this influence). Both are concepts based on soils, climate and biogeography, but they remain constructions with large uncertainties (Tüxen, 1956; Frenzel, 1968; Neuhäusl, 1991; Bohn et al., 2003; Birks, 2019).
For our purpose a map of the modern potential natural vegetation on a small scale will be sufficient showing the ‘zonal vegetation’ that depends on large-scale factors such as temperature and precipitation and that omits the ‘azonal vegetation’ depending on edaphic conditions (for example riparian forests, mires, halophytic habitats). Moreover, the elevational belts of mountain systems cannot be fully shown on this scale. A higher spatial resolution can be found in Ozenda (1979) and Bohn et al. (2003). As an overview we can distinguish five vegetation zones (biomes) in Europe:
• The arctic and alpine zone with treeless dwarf shrub, meadow or tall herb vegetation (A)
• The boreal zone with a dominance of conifers (B)
• The temperate zone with mainly forests of deciduous trees (T)
• The Mediterranean zone with co-dominance (mesomediterranean) or dominance (thermomediterranean) of evergreen broadleaved trees and shrubs (M)
• The Pannonic-Pontic-Anatolian zone with forest steppes, steppes and semi-deserts (P) Most limits are spatially not clearly delimited and this can be expressed in terms such as ‘forest- tundra’ or ‘subarctic’ – belts that can be very broad for example in north-west Russia
Verba et locutiones oratoriae decerptae ex libris oratoriis M. T. Ciceronis : quibus accedunt locutiones dialecticae, ac forenses, ex iisdem libris Ciceronis collectae
No full textopera Ammiani professoris TiguriniBogensignaturen: a-e
Women, agency, and the state in Guinea : silent politics /
No full text"This book examines how women in Guinea articulate themselves politically within and outside institutional politics. It documents the everyday practices that local female actors adopt to deal with the continuous economic, political, and social insecurities that emerge in times of political transformations. Carole Ammann argues that women's political articulations in Muslim Guinea do not primarily take place within women's associations or institutional politics such as political parties; but instead women's silent forms of politics manifest in their daily agency, that is, when they make a living, study, marry, meet friends, raise their children, and do household chores. The book also analyses the relationship between the female population and the local authorities and discusses when and why women's claim making enjoys legitimacy in the eyes of other men and women, as well as representatives of 'traditional' authorities and the local government. Paying particular attention to intersectional perspectives, this book will be of interest to scholars of African studies, social anthropology, political anthropology, the anthropology of gender and urban anthropology, gender studies, and Islamic studies"--"This book examines how women in Guinea articulate themselves politically within and outside institutional politics. It documents the everyday practices that local female actors adopt to deal with the continuous economic, political, and social insecurities that emerge in times of political transformations. Carole Ammann argues that women's political articulations in Muslim Guinea do not primarily take place within women's associations or institutional politics such as political parties; but instead women's silent forms of politics manifest in their daily agency, that is, when they make a living, study, marry, meet friends, raise their children, and do household chores. The book also analyses the relationship between the female population and the local authorities and discusses when and why women's claim making enjoys legitimacy in the eyes of other men and women, as well as representatives of 'traditional' authorities and the local government. Paying particular attention to intersectional perspectives, this book will be of interest to scholars of African studies, social anthropology, political anthropology, the anthropology of gender and urban anthropology, gender studies, and Islamic studies"--OCLC-licensed vendor bibliographic record
Palladium (II) / sulfoxide - promoted strategies for efficient and selective allylic C-H oxidations
No full textThe scientific community has born witness to incredible advancements in organic chemistry. Exemplified by total syntheses of molecules of astonishing complexity, it is becoming more clear that the conquest of a molecular target is less a question of overall feasibility, and more a question of practical resources. This has consequently provoked the need for transformations that allow for the rapid generation of molecular complexity with high efficiency and practicality. Selective C–H activation reactions provide a novel approach for synthesizing complex small molecules, which traditionally have been designed with sites of preincorporated oxidation for further manipulation. The ability to introduce sites of functionality directly onto simple hydrocarbon precursors offers immense potential for streamlined synthetic routes and improved chemical efficiency. Palladium(II) / sulfoxide catalysis has demonstrated broad applicability toward a wide array of allylic C–H functionalizations, starting from abundant and simple α-olefins. The development of such transformations has been classically guided by the reaction’s serial ligand catalysis mechanism, requiring weakly-binding ligands for the palladium catalyst, and the requirement for utilizing non-basic nucleophiles. Developing advancements toward addressing these major challenges has been the subject of this work.
By leveraging the serial ligand catalysis mechanism via a combination of palladium(II)/bis-sulfoxide C–H activation and Lewis acid co-catalysis, we have accomplished the synthesis of six-membered oxygenated heterocycles (chromans, isochromans, and pyrans). The discovery that a wide range of alcohols were competent nucleophiles under uniform reaction conditions (catalyst, solvent, temperature) highlighted the generality of the method. From mechanistic studies, we have hypothesized that the reaction proceeds via an initial C–H activation, followed by chelation-assisted deprotonation and inner-sphere reductive elimination functionalization pathway. Consistent with this, the reaction displayed orthogonal reactivity trends to traditional Pd(0)–catalyzed allylic substitutions.
Due to the weakly-coordinating nature of the bis-sulfoxide ligand, we required a different approach toward achieving asymmetric catalysis. Critical to the success of this goal was the development and utilization of a novel chiral aryl sulfoxide-oxazoline (ArSOX) ligand. We have reported the enantioselective synthesis of isochromans via Pd(II)-catalyzed allylic C–H oxidation from terminal olefin precursors. The reaction proceeds with broad scope and high levels asymmetric induction (avg. 92% ee). Additionally, we observed stereochemically-defined substitution on the isochroman to be well-tolerated, with asymmetric catalysis affording either enhanced diastereoselectivity or a modest turnover. Mechanistic insights indicated that functionalization of the π-allylpalladium intermediate is the enantiodetermining step. Additionally, the utility of the Pd/ArSOX platform is demonstrated with an enantioselective intermolecular allylic C–H alkylation reaction, which proceeds with high levels of asymmetric induction under conditions open to air and moisture.Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2019-12-01The student, Stephen Ammann, accepted the attached license on 2017-10-04 at 09:08.The student, Stephen Ammann, submitted this Dissertation for approval on 2017-10-04 at 10:27.This Dissertation was approved for publication on 2017-10-05 at 15:56.DSpace SAF Submission Ingestion Package generated from Vireo submission #11667 on 2018-03-13 at 10:32:56Made available in DSpace on 2018-03-13T17:29:08Z (GMT). No. of bitstreams: 2
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The adsorption of peroxynitric acid on ice between 230 K and 253 K
No full textPeroxynitric acid uptake to ice and snow has been proposed to be a major loss process from the atmosphere with impacts on the atmospheric oxidation capacity. Here we present results from a laboratory study on the interaction of peroxynitric acid with water ice at low concentration. Experiments were performed in a coated wall flow tube at atmospheric pressure and in the environmentally relevant temperature range of 230 K to 253 K. The interaction was found to be fully reversible and decomposition was not observed. Analysis based on the Langmuir adsorption model showed that the partitioning of peroxynitric acid to ice is orders of magnitude lower than of nitric acid and similar to nitrous acid partitioning behavior. The partition coefficient (<I>K</I><sub>LinC</sub>) and its temperature dependency can be described by 3.74 × 10<sup>&minus;12</sup> × <I>e</I><sup>(7098/<I>T</I>)</sup> [cm]. Atmospheric implications are discussed and show that the uptake to cirrus clouds or to snow-packs in polar areas is an important sink for peroxynitric acid in the environment
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