Résultats de recherche

Résumé Nous parlons volontiers de « protéger la nature », de « préserver la biodiversité », de « services écosystémiques ». Mais derrière ces formules se cache une vision du monde bien particulière : celle d'un humain séparé du vivant, qui décide …

Résumé IUPAC defines a "mechano-chemical reaction" as a "chemical reaction that is induced by the direct absorption of mechanical energy". 1 We investigated a wide range of organic reactions and found that ball milling can affect the oxidation states of …

Résumé Electron transfer-mediated functionalizations present new avenues for the construction of carbon–carbon and carbon–heteroatom bonds from readily available and abundant feedstocks. We have been developing new photocatalytic systems as versatile …

Résumé Visible-light photoredox catalysis provides powerful opportunities for redox transformations under mild conditions;1 however, the development of efficient, low-cost, and metal-free photocatalysts remains a central challenge.1b In this talk, I will …

Christopher Domínguez Michael est invité par l'assemblée du Collège de France sur proposition du Pr William Marx. La conférence est en espagnol avec traduction en surtitrage. Résumé L'exercice de la critique littéraire depuis l'Amérique latine, …

Résumé Part I  – Our approach to cross-coupling uses sulfoxides to activate substrates as sulfonium salts. In particular, sulfonium salts, generated from arenes, 1  and new sulfonium salts generated from alternative feedstocks, 2 can be exploited in …

Résumé Over the past 20 years, significant research has been directed toward the development of new methodologies for synthetic efficiency and atom economy processes in the presence of gold complexes. 1 We have been initially engaged in a wide project …

Résumé Activation of small molecules by donor-acceptor systems is conceptually important as many catalytic processes rely on the synergistic action of electron-rich and -poor sites to cooperatively activate and cleave bonds. This pertains to both the …

Résumé Polyoxometalates (POMs) form a versatile family of molecular oxide clusters of the early transition metals endowed with exceptional redox properties, which have driven applications in photo/electro-catalysis, photo/electro-chromic materials, energy …

Résumé Genetic variation among individuals of the same species fuels evolutionary change and adaptation to a changing environment. Yet, the maintenance of large genetic variation for adaptive traits in natural populations is still discussed as a …

Résumé Activation of carbene precursors by planar, low-spin cobalt(II) complexes leads to formation of ‘carbene radical’ intermediates. 1 These are intrinsically reactive metal-bound carbon radicals (Figure 1), useful for catalytic synthesis of a variety …

Résumé Extensive evidence shows that landscape structure significantly influences farmland biodiversity and can alter the effectiveness of sustainable agricultural practices. In this talk, I will explore how not only the quantity but also the size and …

Résumé Electrochemical reduction of carbon dioxide can yield valuable chemicals, energy carriers, and renewable fuels that serve as storage forms of renewable energy. This transformation can be achieved using molecular catalysts immobilized on conductive …

Résumé Humans strove for generations to create a world without large predators. By doing so they changed the rule of the evolutionary game played for over 400 million years. Can this be without consequences on ecological networks and on the fabric of …

Résumé Species distribution changes associated with human-mediated climate change have important consequences on ecosystems and human well-being. Despite mounting evidence, our knowledge of biodiversity redistribution is still incomplete with only 0.6% of …

Résumé Disturbance regimes such as fire are key drivers of biodiversity, structuring habitats and shaping species assemblages. Fire regimes are rapidly changing due to climate warming, land-use shifts, and long-term suppression policies. Altered fire …

Résumé Recent satellite imagery has achieved the capability to accurately characterize vegetated surfaces at high temporal and spatial resolution, but standard satellite products often fail to capture the complex, fragmented, and heterogeneous spatial …

Table ronde sur le thème : Mithra en dialogue en Asie centrale, Iran et Rome : 1. Le point de vue iranologique (la partie 2. Le point de vue des études gréco-romaines , se déroulera à Sorbonne Université en novembre ou décembre …

Résumé Sustainable development is often trapped in rigid social and ecological processes that drive environmental degradation and entrench poverty and marginalisation, leaving societies ill-prepared for accelerating environmental and technological change. …

Résumé Adaptation to climate change is not just about natural processes or human decisions alone: it emerges from the many relationships among people, within ecosystems, and between society and nature. Around the globe, societies respond in different …

Résumé Pourquoi les théories scientifiques abordant la coopération entre organismes n’ont-elles émergé qu’à la fin du XIX e  siècle, alors que compétition et parasitisme étaient déjà assez connus pour avoir été pris en compte par la théorie de …