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<h1 class="title title1">
Acheter Viagra Sans Ordonnance
</h1>
<div class="article-infos">
<span class="date">Vendredi 31 janvier 2025</span>
<img class="picto-cadenas img-fluid" src="/modules/custom/so_main/assets/img/opened_padlock.png" width="11" height="16" alt="Gratuit" title="Acheter Viagra Sans Ordonnance" loading="lazy" />
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<div class="field field--name-field-article-web-chapeau field--type-text-long field--label-hidden field__item"><div class="tex2jax_process"><p>Grâce à des outils d’intelligence artificielle, une équipe britannique a analysé l’impact des polluants sur la biodiversité de plus de 50 lacs anglais entre 2014 et 2019. Cette approche innovante a permis d’identifier les substances chimiques les plus impliquées dans les transformations des écosystèmes, notamment les insecticides et herbicides. Une avancée qui souligne l’urgence d’une surveillance élargie des contaminants, alors que les effets de nombreux polluants sur la faune et la flore restent méconnus.</p>
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<div class="field field--name-field-image-portrait field--type-image field--label-hidden field__item"> <a href="/climat-ecologie/les-reliefs-%C3%A0-la-surface-des-glaces-diminuent-en-arctique" hreflang="fr"><img loading="lazy" src="#/files/styles/front_teaser_256x375/public/article_web_field_image_portrait/Mount_Erebus_4%20%281%29.jpg?itok=F7cxSivo" width="256" height="256" alt="" class="image-style-front-teaser-256x375 img-fluid" />
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<div class="field__item"><a href="/rubrique/climat" hreflang="fr">Climat</a></div>
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<h1 class="title title1">
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href="/climat-ecologie/les-reliefs-%C3%A0-la-surface-des-glaces-diminuent-en-arctique">
<span>Les reliefs à la surface des glaces diminuent en Arctique</span>
</a>
</h1>
<div class="article-infos">
<span class="date">Lundi 27 janvier 2025</span>
<img class="picto-cadenas img-fluid" src="/modules/custom/so_main/assets/img/opened_padlock.png" width="11" height="16" alt="Gratuit" title="Gratuit" loading="lazy" />
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<div class="field field--name-field-article-web-chapeau field--type-text-long field--label-hidden field__item"><div class="tex2jax_process"><p>Des climatologues de l'Institut Alfred Wegener (Allemagne) alertent d’une nouvelle conséquence du changement climatique sur la banquise en Arctique: depuis 30 ans, les reliefs à la surface des glaces diminuent. Or ces «crêtes de compression» sont essentielles pour les écosystèmes locaux, participent au pouvoir albédo des pôles et atténuent le réchauffement climatique.</p>
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<div class="field field--name-field-image-portrait field--type-image field--label-hidden field__item"> <a href="/biologie/premiers-organo%C3%AFdes-pancr%C3%A9atiques-fonctionnels-avec-trois-types-cellulaires-une-avanc%C3%A9e-majeure" hreflang="fr"><img loading="lazy" src="#/files/styles/front_teaser_256x375/public/article_web_field_image_portrait/pancreas%20new.png?itok=CLrSpQFe" width="256" height="256" alt="" class="image-style-front-teaser-256x375 img-fluid" />
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<div class="field field--name-field-rubrique field--type-entity-reference field--label-hidden field__items">
<div class="field__item"><a href="/rubrique/biologie" hreflang="fr">Biologie</a></div>
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<h1 class="title title1">
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href="/biologie/premiers-organo%C3%AFdes-pancr%C3%A9atiques-fonctionnels-avec-trois-types-cellulaires-une-avanc%C3%A9e-majeure">
<span>Premiers organoïdes pancréatiques fonctionnels avec trois types cellulaires : une avancée majeure</span>
</a>
</h1>
<div class="article-infos">
<span class="date">Jeudi 02 janvier 2025</span>
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<div class="field field--name-field-article-web-chapeau field--type-text-long field--label-hidden field__item"><div class="tex2jax_process"><p>Une équipe de l’Institut Hubrecht, à Utrecht (Pays-Bas), a franchi une étape importante dans l'étude des organoïdes pancréatiques en cultivant pour la première fois des structures comportant les trois types cellulaires du pancréas humain. Jusqu’alors, les organoïdes pancréatiques humains étaient moins fidèles à nos réels organes. Cette étude ouvre des perspectives pour la modélisation des maladies pancréatiques et le développement de traitements. Toutefois, ces organoïdes restent encore à améliorer avant d’être utilisés en médecine régénérative.</p>
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<div class="field field--name-field-image-portrait field--type-image field--label-hidden field__item"> <a href="/entretien-zoologie/%C2%AB-les-sols-sont-notre-patrimoine-%C2%BB-entretien-avec-marc-andr%C3%A9-selosse" hreflang="fr"><img loading="lazy" src="#/files/styles/front_teaser_256x375/public/article_papier_field_image_portrait/Opaleplus.HOUQU230223a_17.jpg?itok=HGy5APIA" width="256" height="304" alt="" class="image-style-front-teaser-256x375 img-fluid" />
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<a class="content-link"
href="/entretien-zoologie/%C2%AB-les-sols-sont-notre-patrimoine-%C2%BB-entretien-avec-marc-andr%C3%A9-selosse">
<span>« Les sols sont notre patrimoine », entretien avec Marc-André Selosse</span>
</a>
</h1>
<div class="article-infos">
Propos recueillis par Mathias Germain
dans <a href="/parution/trimestriel-580">trimestriel 580</a>
daté janvier-mars 2025
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<div class="field field--name-field-article-papier-chapeau field--type-text-long field--label-hidden field__item"><div class="tex2jax_process"><p>À l'interface de l'atmosphère et des roches de l'écorce terrestre, le sol comporte de la matière dans tous ses états: solide, liquide et gazeux. Haut lieu de biodiversité, il fourmille d'animaux et de micro-organismes qui vivent et se nourrissent de façons étonnamment variées. Cet écosystème ultradynamique fournit de nombreux services à l'humanité. Marc-André Selosse, professeur au Muséum national d'histoire naturelle, nous fait découvrir les trésors du sol mais aussi les dangers qui pèsent aujourd'hui sur eux.</p>
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<div class="field field--name-field-image-portrait field--type-image field--label-hidden field__item"> <a href="/chimie/thomas-thiebault-en-s%E2%80%99int%C3%A9ressant-aux-eaux-us%C3%A9es-on-%C3%A9tudie-l%E2%80%99%C3%A9tat-de-sant%C3%A9-des-gens-au-sens-large" hreflang="fr"><img loading="lazy" src="#/files/styles/front_teaser_256x375/public/article_web_field_image_portrait/travaux%20canalisation%20cannes.jpg?itok=SRi0lSuX" width="256" height="224" alt="" class="image-style-front-teaser-256x375 img-fluid" />
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<div class="field__item"><a href="/rubrique/chimie" hreflang="fr">Chimie</a></div>
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<h1 class="title title1">
<a class="content-link"
href="/chimie/thomas-thiebault-en-s%E2%80%99int%C3%A9ressant-aux-eaux-us%C3%A9es-on-%C3%A9tudie-l%E2%80%99%C3%A9tat-de-sant%C3%A9-des-gens-au-sens-large">
<span>Thomas Thiebault : "En s’intéressant aux eaux usées, on étudie l’état de santé des gens au sens large"</span>
</a>
</h1>
<div class="article-infos">
<span class="date">Lundi 09 décembre 2024</span>
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<div class="field field--name-field-article-web-chapeau field--type-text-long field--label-hidden field__item"><div class="tex2jax_process"><p>Les études chimiques et biologiques des eaux usées retracent nos habitudes et modes de vie. Combinées à une expertise sociologique, elles fournissent des informations précieuses pour l’établissement de politiques publiques comme des campagnes de prévention.</p>
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<div class="field field--name-field-image-portrait field--type-image field--label-hidden field__item"> <a href="/math%C3%A9matiques/%C2%ABla-g%C3%A9om%C3%A9trie-est-une-logique-de-limagination%C2%BB" hreflang="fr"><img loading="lazy" src="#/files/styles/front_teaser_256x375/public/article_papier_field_image_portrait/Vincenzo%20de%20Risi.jpeg?itok=6PkDKkvZ" width="256" height="143" alt="" class="image-style-front-teaser-256x375 img-fluid" />
</a>
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<div class="field field--name-field-rubrique field--type-entity-reference field--label-hidden field__items">
<div class="field__item"><a href="/rubrique/math%C3%A9matiques" hreflang="fr">Mathématiques</a></div>
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<h1 class="title title1">
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href="/math%C3%A9matiques/%C2%ABla-g%C3%A9om%C3%A9trie-est-une-logique-de-limagination%C2%BB">
<span>«La géométrie est une logique de l'imagination»</span>
</a>
</h1>
<div class="article-infos">
Propos recueillis par Philippe Pajot
dans <a href="/parution/trimestriel-579">trimestriel 579</a>
daté octobre-novembre-décembre 2024
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<div class="field field--name-field-article-papier-chapeau field--type-text-long field--label-hidden field__item"><div class="tex2jax_process"><p>Longtemps étude des formes et liée à notre perception, l'histoire de la géométrie a suivi un cheminement qui, à partir de ses origines grecques et une domination de la géométrie euclidienne durant presque 2000 ans, a connu une accélération ces derniers siècles, à mesure que des outils et les concepts abstraits ont fait leur apparition. Spécialiste d'Euclide et de Leibniz, Vincenzo De Risi raconte cette évolution et les débats suscités en cours de route.</p>
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<article id="node-57043" class="node node--type-article-web node--promoted node--view-mode-teaser thumbnail clearfix">
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<div class="field field--name-field-image-portrait field--type-image field--label-hidden field__item"> <a href="/nanosciences/nanomat%C3%A9riaux-nouvelle-m%C3%A9thode-pour-produire-des-nanofils-d%E2%80%99aluminium-en-grande-quantit%C3%A9" hreflang="fr"><img loading="lazy" src="#/files/styles/front_teaser_256x375/public/article_web_field_image_portrait/nanofils%20d%27aluminium.png?itok=9oVC3aue" width="256" height="222" alt="" class="image-style-front-teaser-256x375 img-fluid" />
</a>
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<div class="field field--name-field-rubrique field--type-entity-reference field--label-hidden field__items">
<div class="field__item"><a href="/rubrique/nanosciences" hreflang="fr">nanosciences</a></div>
</div>
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</div>
<h1 class="title title1">
<a class="content-link"
href="/nanosciences/nanomat%C3%A9riaux-nouvelle-m%C3%A9thode-pour-produire-des-nanofils-d%E2%80%99aluminium-en-grande-quantit%C3%A9">
<span>Nanomatériaux : nouvelle méthode pour produire des nanofils d’aluminium en grande quantité</span>
</a>
</h1>
<div class="article-infos">
<span class="date">Lundi 14 octobre 2024</span>
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<div class="field field--name-field-article-web-chapeau field--type-text-long field--label-hidden field__item"><div class="tex2jax_process"><p>Une équipe japonaise a mis au point une technique pour obtenir des réseaux denses de nanofils d’aluminium : des nanomatériaux particulièrement précieux pour de nombreuses technologies électroniques et optiques. Leur méthode de production <em>bottom-up</em> repose sur l’utilisation d’un faisceau d’ions focalisés sur une surface de métal. Ce mécanisme de croissance des nanofils, richement décrit, ouvre un potentiel prometteur pour l’industrie.</p>
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<article id="node-57013" class="node node--type-article-papier node--promoted node--view-mode-teaser thumbnail clearfix">
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<div class="field field--name-field-image-portrait field--type-image field--label-hidden field__item"> <a href="/pal%C3%A9og%C3%A9n%C3%A9tique/ladn-environnemental-est-la-nouvelle-fronti%C3%A8re-de-la-pal%C3%A9og%C3%A9nomique" hreflang="fr"><img loading="lazy" src="#/files/styles/front_teaser_256x375/public/article_papier_field_image_portrait/DNA%20Forsker%20Eske%20Willerslev%202014%20_0.jpg?itok=MzatVSB8" width="256" height="150" alt="" class="image-style-front-teaser-256x375 img-fluid" />
</a>
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<div class="field__item"><a href="/rubrique/pal%C3%A9og%C3%A9n%C3%A9tique" hreflang="fr">paléogénétique</a></div>
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<h1 class="title title1">
<a class="content-link"
href="/pal%C3%A9og%C3%A9n%C3%A9tique/ladn-environnemental-est-la-nouvelle-fronti%C3%A8re-de-la-pal%C3%A9og%C3%A9nomique">
<span>"L'ADN ENVIRONNEMENTAL EST LA NOUVELLE FRONTIÈRE DE LA PALÉOGÉNOMIQUE"</span>
</a>
</h1>
<div class="article-infos">
Propos recueillis par Coralie Lemke
dans <a href="/parution/trimestriel-579">trimestriel 579</a>
daté octobre-novembre-décembre 2024
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<div class="field field--name-field-article-papier-chapeau field--type-text-long field--label-hidden field__item"><div class="tex2jax_process"><p>Figure emblématique de la paléogénétique, Eske Willerslev a, avec son équipe, séquencé le premier génome humain ancien. Et c'est aussi avec elle qu'il a séquencé l'ADN le plus ancien jamais retrouvé (deux millions d'années), permettant de reconstruire les environnements préhistoriques et d'éclairer les impacts du changement climatique sur la biodiversité. Par ses découvertes majeures, le Danois a transformé notre compréhension des migrations humaines et des écosystèmes du passé.</p>
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<div class="field field--name-field-image-portrait field--type-image field--label-hidden field__item"> <a href="/astrophysique/on-connait-d%C3%A9sormais-l%E2%80%99origine-de-la-majorit%C3%A9-des-m%C3%A9t%C3%A9orites" hreflang="fr"><img loading="lazy" src="#/files/styles/front_teaser_256x375/public/article_web_field_image_portrait/chondrite.jpg?itok=4Aa1XRoK" width="256" height="256" alt="" class="image-style-front-teaser-256x375 img-fluid" />
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<div class="field__item"><a href="/rubrique/astrophysique" hreflang="fr">Astrophysique</a></div>
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<h1 class="title title1">
<a class="content-link"
href="/astrophysique/on-connait-d%C3%A9sormais-l%E2%80%99origine-de-la-majorit%C3%A9-des-m%C3%A9t%C3%A9orites">
<span>On connait désormais l’origine de la majorité des météorites</span>
</a>
</h1>
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<span class="date">Mercredi 16 octobre 2024</span>
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<div class="field field--name-field-article-web-chapeau field--type-text-long field--label-hidden field__item"><div class="tex2jax_process"><p>Une équipe menée par trois astronomes européens a identifié les trois familles d’astéroïdes Karin, Koronis et Massalia comme sources de plus de 70% des météorites. La pluralité des techniques utilisées a permis de résoudre l’énigme de l’origine de ces roches extraterrestres. Leurs travaux offrent des perspectives pour expliquer la formation de la ceinture principale d’astéroïdes.</p>
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<div class="field field--name-field-image-portrait field--type-image field--label-hidden field__item"> <a href="/sant%C3%A9/les-prot%C3%A9ines-tau-sont-mut%C3%A9es-dans-la-maladie-d%E2%80%99alzheimer-mais-dans-leur-%C3%A9tat-normal-elles-prot%C3%A8gent-nos-neurones" hreflang="fr"><img loading="lazy" src="#/files/styles/front_teaser_256x375/public/article_web_field_image_portrait/Ouverture%20prote%CC%81ine%20tau%20small.jpg?itok=fphyi-CX" width="256" height="192" alt="" class="image-style-front-teaser-256x375 img-fluid" />
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href="/sant%C3%A9/les-prot%C3%A9ines-tau-sont-mut%C3%A9es-dans-la-maladie-d%E2%80%99alzheimer-mais-dans-leur-%C3%A9tat-normal-elles-prot%C3%A8gent-nos-neurones">
<span>Les protéines tau sont mutées dans la maladie d’Alzheimer mais dans leur état normal, elles protègent nos neurones</span>
</a>
</h1>
<div class="article-infos">
<span class="date">Vendredi 25 octobre 2024</span>
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<div class="field field--name-field-article-web-chapeau field--type-text-long field--label-hidden field__item"><div class="tex2jax_process"><p>Connue pour son rôle néfaste dans son état pathologique dans la maladie d’Alzheimer, la protéine tau, présente naturellement dans notre cerveau, est aussi une alliée de lutte contre les substances toxiques dangereuses produites par la machinerie cellulaire des neurones.</p>
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