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The amount of this metal in the environment has increased dramatically since the advent of the industrial age as a result of mining activities, the use of fertilizers and sewage sludge in farming, and discharges from manufacturing activities. The metal bioremediation utility of phototrophic microbes has been demonstrated through their ability to detoxify Hg(II) into HgS under aerobic conditions. Metal sulfides are generally very insoluble and therefore, biologically unavailable.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Results<\/jats:title>\n            <jats:p>When Cd(II) was exposed to cells it was bioconverted into CdS by the green alga <jats:italic>Chlamydomonas reinhardtii<\/jats:italic>, the red alga <jats:italic>Cyanidioschyzon merolae<\/jats:italic>, and the cyanobacterium, <jats:italic>Synechoccocus leopoliensis<\/jats:italic>. Supplementation of the two eukaryotic algae with extra sulfate, but not sulfite or cysteine, increased their cadmium tolerances as well as their abilities to produce CdS, indicating an involvement of sulfate assimilation in the detoxification process. However, the combined activities of extracted serine acetyl-transferase (SAT) and <jats:italic>O<\/jats:italic>-acetylserine(thiol)lyase (OASTL) used to monitor sulfate assimilation, was not significantly elevated during cell treatments that favored sulfide biosynthesis. It is possible that the prolonged incubation of the experiments occurring over two days could have compensated for the low rates of sulfate assimilation. This was also the case for <jats:italic>S. leopoliensis<\/jats:italic> where sulfite and cysteine as well as sulfate supplementation enhanced CdS synthesis. In general, conditions that increased cadmium sulfide production also resulted in elevated cysteine desulfhydrase activities, strongly suggesting that cysteine is the direct source of sulfur for CdS synthesis.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Conclusions<\/jats:title>\n            <jats:p>Cadmium(II) tolerance and CdS formation were significantly enhanced by sulfate supplementation, thus indicating that algae and cyanobacteria can produce CdS in a manner similar to that of HgS. Significant increases in sulfate assimilation as measured by SAT-OASTL activity were not detected. However, the enhanced activity of cysteine desulfhydrase indicates that it is instrumental in the provision of H<jats:sub>2<\/jats:sub>S for aerobic CdS biosynthesis.<\/jats:p>\n          <\/jats:sec>","DOI":"10.1186\/1471-2180-13-161","type":"journal-article","created":{"date-parts":[[2013,7,15]],"date-time":"2013-07-15T22:14:35Z","timestamp":1373926475000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":32,"title":["Aerobic transformation of cadmium through metal sulfide biosynthesis in photosynthetic microorganisms"],"prefix":"10.1186","volume":"13","author":[{"given":"Chad D","family":"Edwards","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Joseph C","family":"Beatty","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jacqueline BR","family":"Loiselle","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Katya A","family":"Vlassov","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daniel D","family":"Lefebvre","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2013,7,15]]},"reference":[{"key":"2055_CR1","first-page":"651","volume":"42","author":"CG Elinder","year":"1985","unstructured":"Elinder CG, Kjellstr\u00f6m T, Hogstedt C, Andersson K, Sp\u00e5ng G: Cancer mortality of cadmium workers. 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