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121.
Karlhofer Bastien Kędra Jarek Marcinkowski Michał Trost Alexander 《Geometriae Dedicata》2021,213(1):523-530
Geometriae Dedicata - We investigate the geometry of word metrics on fundamental groups of manifolds associated with the generating sets consisting of elements represented by closed geodesics. We... 相似文献
122.
F. Feyza
zgen Michael E. Runda Bastien O. Burek Peter Wied Jonathan Z. Bloh Robert Kourist Sandy Schmidt 《Angewandte Chemie (International ed. in English)》2020,59(10):3982-3987
In this study, we coupled a well‐established whole‐cell system based on E. coli via light‐harvesting complexes to Rieske oxygenase (RO)‐catalyzed hydroxylations in vivo. Although these enzymes represent very promising biocatalysts, their practical applicability is hampered by their dependency on NAD(P)H as well as their multicomponent nature and intrinsic instability in cell‐free systems. In order to explore the boundaries of E. coli as chassis for artificial photosynthesis, and due to the reported instability of ROs, we used these challenging enzymes as a model system. The light‐driven approach relies on light‐harvesting complexes such as eosin Y, 5(6)‐carboxyeosin, and rose bengal and sacrificial electron donors (EDTA, MOPS, and MES) that were easily taken up by the cells. The obtained product formations of up to 1.3 g L?1 and rates of up to 1.6 mm h?1 demonstrate that this is a comparable approach to typical whole‐cell transformations in E. coli. The applicability of this photocatalytic synthesis has been demonstrated and represents the first example of a photoinduced RO system. 相似文献
123.
Dr. Chunyang Li Dr. Anne-Doriane Manick Dr. Yuxi Zhao Dr. Fengbo Liu Dr. Bastien Chatelet Roselyne Rosas Prof. Didier Siri Dr. Didier Gigmes Dr. Valerie Monnier Prof. Laurence Charles Dr. Julie Broggi Prof. Simin Liu Prof. Alexandre Martinez Dr. Anthony Kermagoret Dr. David Bardelang 《Chemistry (Weinheim an der Bergstrasse, Germany)》2022,28(64):e202201656
The globular and monocationic guest molecule trimethyl-azaphosphatrane ( AZAP , a protonated Verkade superbase) was shown to form a host:guest 1 : 1 complex with the cucurbit[10]uril (CB[10]) macrocycle in water. Molecular dynamics calculations showed that CB[10] adopts an 8-shape with AZAP occupying the majority of the internal space, CB[10] contracting around AZAP and leaving a significant part of the cavity unoccupied. This residual space was used to co-include planar and monocationic co-guest ( CG ) molecules, affording heteroternary CB[10]⋅ AZAP ⋅ CG complexes potentially opening new perspectives in supramolecular chemistry. 相似文献
124.
Maxime Artault Thomas Cantin Mélissa Longuet Kassandra Vitse Christ Daniel Matatu Mbengo Frédéric Guégan Bastien Michelet Agnès Martin-Mingot Sébastien Thibaudeau 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2024,136(1):e202316458
Here we report a method to reorganize the core structure of aliphatic unsaturated nitrogen-containing substrates exploiting polyprotonation in superacid solutions. The superelectrophilic activation of N-isopropyl systems allows for the selective formal Csp3−H activation/cyclization or homologation / functionalization of nitrogen-containing substrates. This study also reveals that this skeletal reorganization can be controlled through protonation interplay. The mechanism of this process involves an original sequence of C−N bond cleavage, isopropyl cation generation and subsequent C−N bond and C−C bond formation. This was demonstrated through in situ NMR analysis and labelling experiments, also confirmed by DFT calculations. 相似文献
125.
Inside Cover: Hydroxymethylated Dioxobilins in Senescent Arabidopsis thaliana Leaves: Sign of a Puzzling Biosynthetic Intermezzo of Chlorophyll Breakdown (Chem. Eur. J. 33/2015)
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126.
Alireza Ture Savadkoohi Bastien Vaurigaud Claude-Henri Lamarque Stéphane Pernot 《Nonlinear dynamics》2012,67(1):37-46
In this paper governing equations of general multi degrees of freedom (dof) systems with trees of parallel Nonlinear Energy
Sink (NES) devices at each dof are derived. Then these equations are summarized for a 4 dof structure with two parallel NES
at the 4th dof in order to control the first mode of the system. A prototype four storey structure with two parallel NES at the top
floor is studied experimentally. The NES of the mentioned system is designed by endowing the suggested method in the Part
I of this paper. A couple of experimental tests are carried out on the structure at the DGCB laboratory of the ENTPE, France.
The aim is to control the first mode of the compound nonlinear system by demonstrating the efficiency of the parallel NES
systems on the intended task. 相似文献
127.
Alex Blumenthal Bastien Fernandez 《Journal of Dynamics and Differential Equations》2017,29(2):523-547
This paper reports the analysis of a model of pulse-coupled oscillators with global inhibitory coupling, inspired by experiments on colonies of bacteria-embedded synthetic genetic circuits. Populations are represented by one-dimensional profiles and their time evolution is governed by a singular differential equation. We address the initial value problem and characterize the dynamics’ main features. In particular, we prove that all trajectory behaviors are asymptotically periodic, with asymptotic features only depending on the population cluster distribution and on the model parameters. A criterion is obtained for the existence of attracting periodic orbits, which reveals the existence of a sharp transition as the coupling parameter is increased. The transition separates a regime where any cluster distribution can be obtained in the limit of large times, to a situation where only trajectories with sufficiently large groups of synchronized oscillators perdure. 相似文献
128.
129.
Theoretical and Experimental Study on Boron β‐Diketonate Complexes with Intense Two‐Photon‐Induced Fluorescence in Solution and in the Solid State
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Dr. Pierre‐Henri Lanoë Dr. Bastien Mettra Dr. Yuan Yuan Liao Dr. Nathalie Calin Dr. Anthony D'Aléo Tomotaka Namikawa Prof. Kenji Kamada Prof. Fréderic Fages Dr. Cyrille Monnereau Dr. Chantal Andraud 《Chemphyschem》2016,17(14):2128-2136
Three boron diketonate chromophores with extended π‐conjugated backbone were prepared and their spectroscopic features were investigated through a combined theoretical/experimental study. It was shown that these complexes, which undergo very large electronic reorganization upon photoexcitation, combine large two‐photon absorption cross section with an emission energy and quantum efficiency in solution that is strongly dependent on solvent polarity. The strong positive influence of boron complexation on the magnitude of the two‐photon absorption was clearly established, and it was shown that the two‐photon absorption properties were dominated by the quadrupolar term. For one of the synthesized compounds, intense one‐ and two‐photon‐induced solid‐state emission (fluorescence quantum yield of 0.65 with maximum wavelength of 610 nm) was obtained as a result of antiparallel J‐aggregate crystal packing. 相似文献
130.
Léger B Denicourt-Nowicki A Olivier-Bourbigou H Roucoux A 《Inorganic chemistry》2008,47(19):9090-9096
Rhodium nanoparticles stabilized by 2,2'-, 3,3'-, 4,4'-bipyridine ligands were prepared in various ionic liquids according to a chemical reduction approach. Zerovalent nanospecies in the size range of 2.0-2.5 nm were characterized. The nature of the bipyridine and its influence on the coordination environment of rhodium nanoparticles were investigated in various nonaqueous ionic liquids according to the cation and anion. The hydrogenation of various aromatic compounds by these colloidal suspensions was carried out at 80 degrees C and under 40 bar of H 2. A first structural explanation based on bipyridine coordination modes is proposed to justify the observed different activities. 相似文献