Events
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GET /api/v1/mementos/110/events/?format=api&ordering=is_active
{ "count": 3, "next": null, "previous": null, "results": [ { "id": 70833, "title": "EESS seminar talk on \"Biogeochemical Controls on Arsenic Methylation and Demethylation in Rice Paddy Soils\"", "slug": "eess-seminar-talk-on-biogeochemical-controls-on--2", "event_url": "https://memento.epfl.ch/event/eess-seminar-talk-on-biogeochemical-controls-on--2", "visual_url": "https://memento.epfl.ch/image/32237/200x112.jpg", "visual_large_url": "https://memento.epfl.ch/image/32237/720x405.jpg", "visual_maxsize_url": "https://memento.epfl.ch/image/32237/max-size.jpg", "lang": "en", "start_date": "2026-04-28", "end_date": "2026-04-28", "start_time": "12:15:00", "end_time": "13:15:00", "description": "<strong>Abstract:</strong>\r\n<div class=\"page\">\r\n<div class=\"layoutArea\">\r\n<div class=\"column\">Arsenic methylation and demethylation reactions influence arsenic speciation and fate in rice paddy soils, and understanding the balance between methylation and demethylation is important for assessing risks of arsenic toxicity in rice. Rice paddy soils are rich in organic carbon, and the conventional understanding has been that organic carbon enhances microbial arsenic methylation by fueling microbial activity. This presentation will describe a series of recent investigations — spanning pure culture to greenhouse-scale experiments — that challenge this conceptual model. First, the presentation will describe the role of carbon catabolite repression (CCR) in regulating cellular uptake and subsequent enzymatic methylation of arsenite. A combination of biosensor, gene expression, and arsenic speciation analyses demonstrate that sugars lead to CCR and a decrease in arsenic methylation, while low molecular weight organic acids do not impact arsenite uptake. The presentation will then examine couplings between methanogenesis and arsenic demethylation, wherein a greater abundance of methylotrophic carbon substrates (methanol, methylamines) promote arsenic demethylation by methanogens and limit the accumulation of methylated arsenic compounds. A genome-resolved metatranscriptomic analysis of anaerobic soil slurry experiments resolved links between methylotrophic substrate utilization and arsenic demethylation, while greenhouse experiments showed that higher levels of methanogenesis in soils were associated with lower concentrations of methylated arsenic in rice grains. Taken together, these results provide a more nuanced understanding of how utilization of distinct carbon substrates impacts arsenic methylation-demethylation dynamics, and provides mechanistic insights into how paddy soil management practices influence arsenic speciation in rice.</div>\r\n</div>\r\n</div>\r\n<br>\r\n<br>\r\n<br>\r\n<strong>Biography:</strong>\r\n\r\n<div class=\"page\">\r\n<div class=\"layoutArea\">\r\n<div class=\"column\">Dr. Matthew Reid is an associate professor in the School of Civil and Environmental Engineering at Cornell University and directs the Biogeochemistry and Ecosystem Engineering Research Group. His research program focuses on biogeochemical element cycling in natural and nature-based systems with applications to water quality. Research in the Reid Group spans physical scales and integrates mechanistic and molecular-level investigation with field-scale observation to build quantitative models for contaminant dynamics in complex biogeochemical systems. Dr. Reid's research has been recognized with early career awards from NSF and DOE. Dr. Reid was a postdoctoral scientist in the Environmental Microbiology Laboratory at EPFL, and completed his Ph.D. in Civil and Environmental Engineering at Princeton University.</div>\r\n</div>\r\n</div>", "image_description": "", "creation_date": "2026-01-12T14:34:48", "last_modification_date": "2026-02-25T14:38:54", "link_label": "", "link_url": "", "canceled": "False", "cancel_reason": "", "place_and_room": "GC B1 10", "url_place_and_room": "https://plan.epfl.ch/?room==GC%20B1%2010", "url_online_room": "https://epfl.zoom.us/j/69011077410", "spoken_languages": [ "https://memento.epfl.ch/api/v1/spoken_languages/2/?format=api" ], "speaker": "Prof. <a href=\"https://www.engineering.cornell.edu/people/matthew-charles-reid/\">Matthew Reid</a>, Cornell University ", "organizer": "EESS - IIE", "contact": "Prof. Rizlan Latmani, <a href=\"https://www.epfl.ch/labs/eml/\">EML</a>", "is_internal": "True", "theme": "", "vulgarization": { "id": 1, "fr_label": "Tout public", "en_label": "General public" }, "registration": { "id": 3, "fr_label": "Entrée libre", "en_label": "Free" }, "keywords": "Arsenic, Methylation, Demethylation, Rice paddy soil, Carbon catabolite repression, Methanogenesis", "file": null, "icalendar_url": "https://memento.epfl.ch/event/export/119269/", "category": { "id": 1, "code": "CONF", "fr_label": "Conférences - Séminaires", "en_label": "Conferences - Seminars", "activated": true }, "academic_calendar_category": null, "domains": [], "mementos": [ "https://memento.epfl.ch/api/v1/mementos/110/?format=api", "https://memento.epfl.ch/api/v1/mementos/4/?format=api", "https://memento.epfl.ch/api/v1/mementos/44/?format=api" ] }, { "id": 70233, "title": "Cryo electron microscopy of vitreous sections revisited for high throughput tomographic imaging of tissue and cells", "slug": "cryo-electron-microscopy-of-vitreous-sections-revi", "event_url": "https://memento.epfl.ch/event/cryo-electron-microscopy-of-vitreous-sections-revi", "visual_url": "https://memento.epfl.ch/image/31688/200x112.jpg", "visual_large_url": "https://memento.epfl.ch/image/31688/720x405.jpg", "visual_maxsize_url": "https://memento.epfl.ch/image/31688/max-size.jpg", "lang": "en", "start_date": "2026-05-05", "end_date": "2026-05-05", "start_time": "16:00:00", "end_time": "17:00:00", "description": "<br>\r\n<br>\r\nCellular cryo electron tomography is experiencing spectacular developments, revealing with increasing resolution and complexity the structures and interactions of macromolecules at work in living matter. To obtain thin samples from biological tissue and cells in their flash-frozen native state, cryo-FIB milling is nowadays the most popular method, with impressive successes. The alternative, cryo-ultramicrotomy - also known as CEMOVIS - has been overshadowed because of (i) technical difficulties associated to cryo-section generation and collection - in particular the lack of control over adhesion; and (ii) crevasses and compression artefacts.<br>\r\nI will present recent developments with optimization of the experimental workflow, focusing on section adhesion and their support grids. These result in high throughput data acquisition, with typically several tens to hundreds of cryo-tomograms per sample. Revisiting cutting artefacts shows that crevasses alter but 10 % of the sample volume. Compression is heterogeneous, with scale and material-dependent effects. This is altogether a drawback – with no simple computational correction – and an advantage for projects dedicated to non-(or little)-affected objects such as nucleosomes and chromatin.<br>\r\nAltogether, it is time to revive CEMOVIS as a practical alternative to cryo-FIB milling, offering specific advantages: (i) imaging of large areas of any type of sample, from cells to tissues, organs or even entire organisms – and more generally all kinds of hydrated molecular systems ; (ii) the possibility of serial section approaches ; (iii) no beam damage ; and (iv) a specimen thickness that can be tuned down to 30-50 nm, which may be an advantage for high resolution imaging of small molecular complexes.<br>\r\n<br>\r\n<br>\r\n<br>\r\n<br>\r\n<strong>Biography</strong><br>\r\n<br>\r\nAmélie Leforestier is a CNRS research director at the Solid-State Physics Laboratory (LPS, Paris-Saclay, France). After a PhD in Life Sciences on liquid crystalline self-assembly of DNA, she learned cryo electron microscopy during her post-doctoral studies in the group of Jacques Dubochet in Lausanne. Back in France, she set up a cryo-EM facility for soft matter physics at LPS. She is part of an <a href=\"https://equipes.lps.u-psud.fr/sobio/\">interdisciplinary team</a> dedicated to self-assembly processes at work in living systems at the molecular level. Her work, combining concepts from soft matter physics (poly-electrolytes, liquid crystals, frustration) and structural biology, focuses on the geometry and interactions in condensed states of DNA and chromosomes <em>in vitro</em> and <em>in situ</em>.", "image_description": "", "creation_date": "2025-10-29T08:00:54", "last_modification_date": "2026-03-04T11:07:41", "link_label": "", "link_url": "", "canceled": "False", "cancel_reason": "", "place_and_room": "", "url_place_and_room": "", "url_online_room": "https://epfl.zoom.us/j/65708791562", "spoken_languages": [ "https://memento.epfl.ch/api/v1/spoken_languages/2/?format=api" ], "speaker": "Amélie Leforestier | CNRS, France", "organizer": "CIME", "contact": "[email protected]", "is_internal": "True", "theme": "", "vulgarization": { "id": 1, "fr_label": "Tout public", "en_label": "General public" }, "registration": { "id": 3, "fr_label": "Entrée libre", "en_label": "Free" }, "keywords": "", "file": null, "icalendar_url": "https://memento.epfl.ch/event/export/118314/", "category": { "id": 1, "code": "CONF", "fr_label": "Conférences - Séminaires", "en_label": "Conferences - Seminars", "activated": true }, "academic_calendar_category": null, "domains": [], "mementos": [ "https://memento.epfl.ch/api/v1/mementos/1/?format=api", "https://memento.epfl.ch/api/v1/mementos/5/?format=api", "https://memento.epfl.ch/api/v1/mementos/8/?format=api", "https://memento.epfl.ch/api/v1/mementos/9/?format=api", "https://memento.epfl.ch/api/v1/mementos/110/?format=api", "https://memento.epfl.ch/api/v1/mementos/339/?format=api", "https://memento.epfl.ch/api/v1/mementos/284/?format=api", "https://memento.epfl.ch/api/v1/mementos/6/?format=api" ] }, { "id": 71200, "title": "Swiss Final of the Competition Ma thèse en 180 secondes (MT180)", "slug": "swiss-final-of-the-competition-ma-these-en-180-sec", "event_url": "https://memento.epfl.ch/event/swiss-final-of-the-competition-ma-these-en-180-sec", "visual_url": "https://memento.epfl.ch/image/32730/200x112.jpg", "visual_large_url": "https://memento.epfl.ch/image/32730/720x405.jpg", "visual_maxsize_url": "https://memento.epfl.ch/image/32730/max-size.jpg", "lang": "en", "start_date": "2026-05-21", "end_date": "2026-05-21", "start_time": "18:30:00", "end_time": "20:00:00", "description": "<p>The Swiss French Final of the competition \"Ma thèse en 180 secondes (MT180)\" will take place this year at EPFL with 12 to 14 PhD students from Higher Education Institutions, among which three from EPFL. Their challenge ? Present their research in just 3 minutes to a non-specialist audience, in French, effectively and in an engaging way, all with just a single slide !<br>\r\n<br>\r\nThe winners of the EPFL Final <strong>Ali Mehdi Gadiri, Camille Lambert and Antoni Gralak </strong>will be present at the event. Save the date of 21 May and come to cheer on them !<br>\r\n<br>\r\nThe name of all Finalists and their Thesis will be known after the local Finals; you can find the dates on the website <a href=\"https://mt180.ch\">mt180.ch</a>.<br>\r\n<br>\r\n </p>", "image_description": "", "creation_date": "2026-02-20T15:43:50", "last_modification_date": "2026-03-24T15:35:27", "link_label": "Finale suisse MT180", "link_url": "https://mt180.ch", "canceled": "False", "cancel_reason": "", "place_and_room": "EPFL Lausanne, Forum Rolex", "url_place_and_room": "https://plan.epfl.ch/?room==RLC%20E1%20240", "url_online_room": "", "spoken_languages": [ "https://memento.epfl.ch/api/v1/spoken_languages/1/?format=api" ], "speaker": "Finalistes EPFL: Mehdi Ali Gadiri, Camille Lambert, Antoni Gralak", "organizer": "<a href=\"https://sps.epfl.ch\">Service de promotion des sciences de l'EPFL</a> et <a href=\"https://www.cuso.ch/contact\">Conférence universitaire de suisse occidentale (CUSO)</a>", "contact": "<a href=\"mailto:[email protected]?subject=Finale%20suisse%20MT180\">[email protected]</a>", "is_internal": "False", "theme": "", "vulgarization": { "id": 1, "fr_label": "Tout public", "en_label": "General public" }, "registration": { "id": 1, "fr_label": "Sur inscription", "en_label": "Registration required" }, "keywords": "MT180, Finale suisse, Compétition, PhD, Doctorat, Recherche, EPFL, SPS, CUSO", "file": null, "icalendar_url": "https://memento.epfl.ch/event/export/119830/", "category": { "id": 19, "code": "PUBLICSCIENCE", "fr_label": "Evènements scientifiques grand public", "en_label": "Public Science Events", "activated": true }, "academic_calendar_category": null, "domains": [], "mementos": [ "https://memento.epfl.ch/api/v1/mementos/170/?format=api", "https://memento.epfl.ch/api/v1/mementos/1/?format=api", "https://memento.epfl.ch/api/v1/mementos/6/?format=api", "https://memento.epfl.ch/api/v1/mementos/4/?format=api", "https://memento.epfl.ch/api/v1/mementos/5/?format=api", "https://memento.epfl.ch/api/v1/mementos/8/?format=api", "https://memento.epfl.ch/api/v1/mementos/9/?format=api", "https://memento.epfl.ch/api/v1/mementos/110/?format=api", "https://memento.epfl.ch/api/v1/mementos/79/?format=api", "https://memento.epfl.ch/api/v1/mementos/145/?format=api", "https://memento.epfl.ch/api/v1/mementos/22/?format=api" ] } ] }
