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SIGLEC-1: un récepteur qui favorise la dissémination du virus dans la co-infection VIH/tuberculose

mercredi 8 avril 2020 — Vie et Terre

Plus de 1,2 millions d'individus sont co-infectés par le virus du SIDA (VIH-1) et le bacille de la tuberculose (Mycobacterium tuberculosis), et la co-infection VIH/tuberculose est encore responsable...

Techno-sciences

Layered nanocomposites by shear-flow-induced alignment of nanosheets

mercredi 8 avril 2020 par Chuangqi Zhao, Pengchao Zhang, Jiajia Zhou, Shuanhu Qi, Yoshihiro Yamauchi, Ruirui Shi, Ruochen Fang, Yasuhiro Ishida, Shutao Wang, Antoni P. Tomsia, Lei Jiang, Mingjie Liu

Nature, Published online: 08 April 2020; doi:10.1038/s41586-020-2161-8Layered nanocomposites fabricated using a continuous and scalable process achieve properties exceeding those of natural nacre, the result of stiffened matrix polymer chains confined between highly aligned (...)

Nature

Collisional cooling of ultracold molecules

mercredi 8 avril 2020 par Hyungmok Son, Juliana J. Park, Wolfgang Ketterle, Alan O. Jamison

Nature, Published online: 08 April 2020; doi:10.1038/s41586-020-2141-zNaLi molecules are cooled to micro- and nanokelvin temperatures through collisions with ultracold Na atoms by using molecules and atoms in stretched hyperfine spin states and applying two evaporation (...)

Nature

Nanostructured alloys light the way to silicon-based photonics

mercredi 8 avril 2020 par Anna Fontcuberta i Morral

Nature, Published online: 08 April 2020; doi:10.1038/d41586-020-00976-8Silicon used for electronics has a cubic crystal lattice, which makes the material unsuitable for photonics applications. A method for producing germanium and silicon–germanium alloys that have hexagonal lattices offers a (...)

Nature

Accurate compound-specific ¹⁴C dating of archaeological pottery vessels

mercredi 8 avril 2020 par Emmanuelle Casanova, Timothy D. J. Knowles, Alex Bayliss, Julie Dunne, Marek Z. Barański, Anthony Denaire, Philippe Lefranc, Savino di Lernia, Mélanie Roffet-Salque, Jessica Smyth, Alistair Barclay, Toby Gillard, Erich Claßen, Bryony Coles, Michael Ilett, Christian Jeunesse, Marta Krueger, Arkadiusz Marciniak, Steve Minnitt, Rocco Rotunno, Pieter van de Velde, Ivo van Wijk, Jonathan Cotton, Andy Daykin, Richard P. Evershed

Nature, Published online: 08 April 2020; doi:10.1038/s41586-020-2178-zUsing lipid residues absorbed in potsherds, the ages of pottery from various archaeological sites are determined and validated using sites for which the dates are well known from other (...)

Nature

A plant genetic network for preventing dysbiosis in the phyllosphere

mercredi 8 avril 2020 par Tao Chen, Kinya Nomura, Xiaolin Wang, Reza Sohrabi, Jin Xu, Lingya Yao, Bradley C. Paasch, Li Ma, James Kremer, Yuti Cheng, Li Zhang, Nian Wang, Ertao Wang, Xiu-Fang Xin, Sheng Yang He

Nature, Published online: 08 April 2020; doi:10.1038/s41586-020-2185-0Mutations in genes involved in immune signalling and vesicle trafficking cause defects in the leaf microbiome of Arabidopsis thaliana that result in damage to leaf tissues, suggesting mechanisms by which terrestrial plants (...)

Nature

Mature forest shows little increase in carbon uptake in a CO₂-enriched atmosphere

mercredi 8 avril 2020 par Yiqi Luo, Shuli Niu

Nature, Published online: 08 April 2020; doi:10.1038/d41586-020-00962-0Will mature forests absorb enough carbon from the atmosphere to mitigate climate change as levels of carbon dioxide increase? An experiment in a eucalyptus forest provides fresh (...)

Nature

Separase-triggered apoptosis enforces minimal length of mitosis

mercredi 8 avril 2020 par Susanne Hellmuth, Olaf Stemmann

Nature, Published online: 08 April 2020; doi:10.1038/s41586-020-2187-yIf early mitosis is too short, separase induces apoptosis by cleaving MCL2 and BCL-XL, thereby eliminating cells that are prone to chromosome missegregation.

Nature

The fate of carbon in a mature forest under carbon dioxide enrichment

mercredi 8 avril 2020 par Mingkai Jiang, Belinda E. Medlyn, John E. Drake, Remko A. Duursma, Ian C. Anderson, Craig V. M. Barton, Matthias M. Boer, Yolima Carrillo, Laura Castañeda-Gómez, Luke Collins, Kristine Y. Crous, Martin G. De Kauwe, Bruna M. dos Santos, Kathryn M. Emmerson, Sarah L. Facey, Andrew N. Gherlenda, Teresa E. Gimeno, Shun Hasegawa, Scott N. Johnson, Astrid Kännaste, Catriona A. Macdonald, Kashif Mahmud, Ben D. Moore, Loïc Nazaries, Elizabeth H. J. Neilson, Uffe N. Nielsen, Ülo Niinemets, Nam Jin Noh, Raúl Ochoa-Hueso, Varsha S. Pathare, Elise Pendall, Johanna Pihlblad, Juan Piñeiro, Jeff R. Powell, Sally A. Power, Peter B. Reich, Alexandre A. Renchon, Markus Riegler, Riikka Rinnan, Paul D. Rymer, Roberto L. Salomón, Brajesh K. Singh, Benjamin Smith, Mark G. Tjoelker, Jennifer K. M. Walker, Agnieszka Wujeska-Klause, Jinyan Yang, Sönke Zaehle, David S. Ellsworth

Nature, Published online: 08 April 2020; doi:10.1038/s41586-020-2128-9Carbon dioxide enrichment of a mature forest resulted in the emission of the excess carbon back into the atmosphere via enhanced ecosystem respiration, suggesting that mature forests may be limited in their capacity to (...)

Nature