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Presently, chemically synthesized QDs are employed in solar cells, bioimaging, and various technological domains. However, many applications demand QDs with prolonged lifespans under conditions of high-energy radiation. Over the past decade, microbial biosynthesis of nanomaterials has emerged as a sustainable and cost-effective process. In this context, the utilization of extremophile microorganisms for synthesizing QDs with unique properties has recently been reported.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>In this study, UV-resistant bacteria were isolated from one of the most extreme environments in Antarctica, Union Glacier at the Ellsworth Mountains. Bacterial isolates, identified through 16\u00a0S sequencing, belong to the genera <jats:italic>Rhodococcus<\/jats:italic>, <jats:italic>Pseudarthrobacter<\/jats:italic>, and <jats:italic>Arthrobacter<\/jats:italic>. Notably, <jats:italic>Rhodococcus<\/jats:italic> sp. (EXRC-4\u00a0A-4), <jats:italic>Pseudarthrobacter<\/jats:italic> sp. (RC-2-3), and <jats:italic>Arthrobacter<\/jats:italic> sp. (EH-1B-1) tolerate UV-C radiation doses\u2009\u2265\u2009120\u00a0J\/m\u00b2. Isolated UV-resistant bacteria biosynthesized CdS QDs with fluorescence intensities 4 to 8 times higher than those biosynthesized by <jats:italic>E. coli<\/jats:italic>, a mesophilic organism tolerating low doses of UV radiation. Transmission electron microscopy (TEM) analysis determined QD sizes ranging from 6 to 23\u00a0nm, and Fourier-transform infrared (FTIR) analysis demonstrated the presence of biomolecules. QDs produced by UV-resistant Antarctic bacteria exhibit high photostability after exposure to UV-B radiation, particularly in comparison to those biosynthesized by <jats:italic>E. coli<\/jats:italic>. Interestingly, red fluorescence-emitting QDs biosynthesized by <jats:italic>Rhodococcus<\/jats:italic> sp. (EXRC-4\u00a0A-4) and <jats:italic>Arthrobacter<\/jats:italic> sp. (EH-1B-1) increased their fluorescence emission after irradiation. Analysis of methylene blue degradation after exposure to irradiated QDs biosynthesized by UV-resistant bacteria, indicates that the QDs transfer their electrons to O<jats:sub>2<\/jats:sub> for the formation of reactive oxygen species (ROS) at different levels.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusions<\/jats:title>\n                <jats:p>UV-resistant Antarctic bacteria represent a novel alternative for the sustainable generation of nanostructures with increased radiation tolerance\u2014two characteristics favoring their potential application in technologies requiring continuous exposure to high-energy radiation.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Graphical abstract<\/jats:title>\n                \n              <\/jats:sec>","DOI":"10.1186\/s12934-024-02417-x","type":"journal-article","created":{"date-parts":[[2024,5,17]],"date-time":"2024-05-17T05:01:55Z","timestamp":1715922115000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Biosynthesis of photostable CdS quantum dots by UV-resistant psychrotolerant bacteria isolated from Union Glacier, Antarctica"],"prefix":"10.1186","volume":"23","author":[{"given":"Mat\u00edas","family":"Vargas-Reyes","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nicol\u00e1s","family":"Bruna","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Javiera","family":"Ramos-Z\u00fa\u00f1iga","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Felipe","family":"Valenzuela-Ibaceta","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Paula","family":"Rivas-\u00c1lvarez","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Claudio A.","family":"Navarro","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jos\u00e9 M.","family":"P\u00e9rez-Donoso","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2024,5,17]]},"reference":[{"issue":"6555","key":"2417_CR1","first-page":"eaaz8541","volume":"373","author":"FP Garc\u00eda de Arquer","year":"2021","unstructured":"Garc\u00eda de Arquer FP, Talapin DV, Klimov VI, Arakawa Y, Bayer M, Sargent EH. 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