{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,11]],"date-time":"2026-06-11T00:40:55Z","timestamp":1781138455511,"version":"3.54.1"},"reference-count":60,"publisher":"PeerJ","license":[{"start":{"date-parts":[[2022,9,15]],"date-time":"2022-09-15T00:00:00Z","timestamp":1663200000000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100004504","name":"Research Council of Lithuania","doi-asserted-by":"crossref","award":["S-MIP-20-22"],"award-info":[{"award-number":["S-MIP-20-22"]}],"id":[{"id":"10.13039\/501100004504","id-type":"DOI","asserted-by":"crossref"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"abstract":"<jats:sec>\n                    <jats:title>Background<\/jats:title>\n                    <jats:p>With the rapid development of nanotechnology, more and more nanoproducts are being released into the environment where they may both pose ecological risks and be toxic to living organisms. The ecotoxicological impact of quantum dots (QDs), a class of nanoparticles (NPs), on aquatic organisms is becoming an emerging issue, this due to their nano-specific properties, to the physico-chemical transformation in the environment and to the possible release of toxic metals from their structure such as Cd.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>\n                      In this work, (i) spectroscopic measurements of commercially available Cd-based QDs (CdSe\/ZnS-COOH) were made at various pH values (5.0 and 7.0) to study their interactions (at a concentration of 4 nm) with various strains of Gram-positive and Gram-negative gut bacteria after short-term exposure and (ii) the antibacterial efficacy of QDs and Cd\n                      <jats:sup>2+<\/jats:sup>\n                      (at a concentration 0.09\u20133.56 mM) against gut bacteria isolated from wild freshwater\n                      <jats:italic>Salmo trutta<\/jats:italic>\n                      fry was studied at different temperatures (15 \u00b0C and 25 \u00b0C) and pH values (5.0 and 7.0) by applying a well-established disc diffusion assay.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      Twenty-six gut bacterial isolates from wild\n                      <jats:italic>Salmo trutta<\/jats:italic>\n                      fry were identified as\n                      <jats:italic>Aeromonas<\/jats:italic>\n                      spp.,\n                      <jats:italic>A. popoffii<\/jats:italic>\n                      ,\n                      <jats:italic>A. salmonicida<\/jats:italic>\n                      ,\n                      <jats:italic>A. sobria<\/jats:italic>\n                      ,\n                      <jats:italic>Carnobacterium maltaromaticum<\/jats:italic>\n                      ,\n                      <jats:italic>Buttiauxella<\/jats:italic>\n                      sp.,\n                      <jats:italic>Listeria<\/jats:italic>\n                      sp.,\n                      <jats:italic>Microbacterium<\/jats:italic>\n                      sp.,\n                      <jats:italic>Shewanella putrefaciens<\/jats:italic>\n                      and\n                      <jats:italic>Serratia<\/jats:italic>\n                      sp. Cd-based (CdSe\/ZnS-COOH) QDs at a concentration of 4 nm were found to be stable in aqueous media (with pH 7.0) or starting to form aggregates (at pH 5.0), thus, apparently, did not release heavy metals (HMs) into the media over 48 h in conditions of light or dark and did not show antibacterial efficacy on the gut bacteria isolated from wild\n                      <jats:italic>Salmo trutta<\/jats:italic>\n                      fry after short-term (9 h and 48 h) incubations. Cd\n                      <jats:sup>2+<\/jats:sup>\n                      was found to produce significant dose-dependent toxic effects on bacterial growth, and the size of the inhibition zones on some of the tested strains significantly correlated with temperature. The most sensitive and the most resistant to Cd\n                      <jats:sup>2+<\/jats:sup>\n                      were the Gram-positive bacteria, for which the minimum inhibitory concentration (MIC) values of Cd\n                      <jats:sup>2+<\/jats:sup>\n                      were 0.09\u20130.27 mM and 3.11\u20133.29 mM respectively and varied significantly between the tested temperatures (15 \u00b0C and 25 \u00b0C). The MIC values of Cd\n                      <jats:sup>2+<\/jats:sup>\n                      for the Gram-negative bacteria (18 out of 22 strains) ranged from 0.44 to 0.71 mM and did not differ significantly between the tested temperatures. Among the selected Gram-positive and Gram-negative strains, those with the higher sensitivity towards Cd\n                      <jats:sup>2+<\/jats:sup>\n                      also revealed relatively stronger signals of QDs photoluminescence (PL) when transferred after incubation into fresh medium without QDs. In addition, the formation of endogenous metalloporphyrins observed spectroscopically in some bacterial strains indicates certain differences in metabolic activity that may play a protective role against potential oxidative damage.\n                    <\/jats:p>\n                  <\/jats:sec>","DOI":"10.7717\/peerj.14025","type":"journal-article","created":{"date-parts":[[2022,9,15]],"date-time":"2022-09-15T03:59:07Z","timestamp":1663214347000},"page":"e14025","source":"Crossref","is-referenced-by-count":6,"title":["Interactions of semiconductor Cd-based quantum dots and Cd\n                    <sup>2+<\/sup>\n                    with gut bacteria isolated from wild\n                    <i>Salmo trutta<\/i>\n                    fry"],"prefix":"10.7717","volume":"10","author":[{"given":"Renata","family":"Butrimien\u0117","sequence":"first","affiliation":[{"name":"Institute of Ecology, Nature Research Centre, Vilnius, 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