{"ok":true,"nota":{"id":"4b94be96e8be42a6","slug":"un-metodo-nuevo-permite-mapear-hacia-donde-apuntan-las-moleculas-que-b-4b94be","titulo":"Un método nuevo permite mapear hacia dónde apuntan las moléculas que brillan en el microscopio","resumen":"Investigadores desarrollaron una técnica de microscopía de dos fotones que analiza la orientación de moléculas fluorescentes sin necesidad de suponer una forma geométrica previa. Probaron el método en muestras artificiales y midieron qué nivel de detalle puede recuperarse.","fuente":"hal","fuenteNombre":"HAL · Ciencia abierta","color":"#b06000","autor":"Ferrand, Patrick, Gasecka, P., Kress, A.","url":"https://hal.science/hal-00999736","imagen":"/hoy/portada/4b94be96e8be42a6","tema":"ciencia","subtemas":["microscopía","fluorescencia","biofísica","imagenología","métodos de medición"],"entidades":["HAL"],"formato":"dato","entretenimiento":false,"pubTs":"2026-10-22T00:00:00.000Z","indexTs":"2026-10-22T10:32:02.032Z","hash":"979eb131d57a3eb4f5922628e67b43ef5ac72d8124d628a0af3371338d577368","tsa":{"time":"Oct 22 10:32:40 2026 GMT","provider":"freetsa.org","sobre":"sello"},"stats":{"views":0,"likes":0,"clicks":0,"dwell":0},"tipo":"normal","registro":"hallazgo","porQueImporta":"Hasta ahora, para entender cómo se orientan estas moléculas había que asumir modelos geométricos que podían distorsionar el resultado. Con este enfoque se obtiene el mapa sin esas suposiciones, lo que puede ayudar a los laboratorios de biología y materiales que observan tejidos y estructuras a ver mejor. Para alguien de acá, es un avance que se nota en la investigación médica y no en la vida cotidiana. Todavía falta comprobar cuánto funciona con células reales.","quienFirma":"HAL (repositorio de ciencia abierta francés)","confianza":"preprint","consulta":null},"sello":{"hash":"979eb131d57a3eb4f5922628e67b43ef5ac72d8124d628a0af3371338d577368","sello":"856de6433049a687946c4bb08d87e10017f65f39a42bae41b15ee76ff5f65131","beacon":{"drand":{"cadena":"8990e7a9aaed2ffed73dbd7092123d6f289930540d7651336225dc172e51b2ce","ronda":6574471,"aleatorio":"8dc65bda024d9b15bc5015dca7a625bd58abcd79898d9e649dd88c7b09d4609e","tiempo":"2026-10-22T10:32:30.000Z"},"nist":{"cadena":2,"pulso":1994441,"salida":"917B00588BBAF41DD8C461E7D93EA47DC73C00983776285722380061C2505D68D1C49D178A1E9E1A422EEA35DB6367141AB79828DD0F9592CE1805F752B02469","tiempo":"2026-10-22T10:32:00.000Z"},"noAntes":"2026-10-22T10:32:30.000Z"},"verificacion":{"drand":true,"nist":true},"tsa":{"time":"Oct 22 10:32:40 2026 GMT","provider":"freetsa.org","sobre":"sello"},"original":{"titulo":"Ultimate use of two-photon fluorescence microscopy to map orientational behavior of fluorophores","descripcion":"The orientational distribution of fluorophores is an important reporter of the structure and function of their molecular environment. Although this distribution affects the fluorescence signal under polarized-light excitation, its retrieval is limited to a small number of parameters. Because of this limitation, the need for a geometrical model (cone, Gaussian, etc.) to effect such retrieval is often invoked. In this work, using a symmetry decomposition of the distribution function of the fluorescent molecules, we show that polarized two-photon fluorescence based on tunable linear dichroism allows for the retrieval of this distribution with reasonable fidelity and without invoking either an a priori knowledge of the system to be investigated or a geometrical model. We establish the optimal level of detail to which any distribution can be retrieved using this technique. As applied to artif","pubDate":"2026-10-22","url":"https://hal.science/hal-00999736"},"indexado":"2026-10-22T10:32:02.032Z"}}