{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,12]],"date-time":"2026-03-12T03:05:05Z","timestamp":1773284705793,"version":"3.50.1"},"reference-count":36,"publisher":"American Society for Microbiology","issue":"10","license":[{"start":{"date-parts":[[1998,10,1]],"date-time":"1998-10-01T00:00:00Z","timestamp":907200000000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.asm.org\/non-commercial-tdm-license"}],"content-domain":{"domain":["journals.asm.org"],"crossmark-restriction":true},"short-container-title":["Appl Environ Microbiol"],"published-print":{"date-parts":[[1998,10]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n          <jats:p>\n            Assays of photosynthesis were conducted with a biofilm population of a cyanobacterium, a\n            <jats:italic>Synechococcus<\/jats:italic>\n            sp., growing at \u223c70\u00b0C in a Yellowstone National Park hot spring to test whether cells growing near the upper temperature limit of photosynthetic life are optimally adapted to their mean environmental temperature. Cell suspensions were assayed at 70, 65, and 55\u00b0C while being simultaneously exposed to modified solar environments, including reduction of total irradiance and exclusion of UV radiation. Carbon fixation was greatest at 65\u00b0C, while 70 and 55\u00b0C were always supraoptimal and suboptimal for photosynthesis, respectively. The degree of temperature stress was dependent upon light intensity, and this light-dependent temperature effect may involve both reduced quantum efficiency at subsaturating irradiances and a lower saturating irradiance at both supraoptimal and suboptimal temperatures. The\n            <jats:italic>Synechococcus<\/jats:italic>\n            sp. was also more susceptible to UV inhibition of photosynthesis at nonoptimal temperatures. These results suggest that this population is persisting at a nearly lethal temperature and is consequently subject to greater damage by both visible and UV radiation, but it is speculated that these cells may be avoiding competition with other photoautotrophs under these nonoptimal conditions. In separate experiments monitoring diurnal patterns of photosynthesis, cells exhibited peak productivity during the morning, followed by an afternoon decline. No recovery of photosynthesis was observed during the remaining daytime, and carbon fixation was always UV inhibited under conditions of photosynthetically saturating light.\n          <\/jats:p>","DOI":"10.1128\/aem.64.10.3893-3899.1998","type":"journal-article","created":{"date-parts":[[2019,12,19]],"date-time":"2019-12-19T18:54:45Z","timestamp":1576781685000},"page":"3893-3899","update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":47,"title":["Effects of Visible Light and UV Radiation on Photosynthesis in a Population of a Hot Spring Cyanobacterium, a\n            <i>Synechococcus<\/i>\n            sp., Subjected to High-Temperature Stress"],"prefix":"10.1128","volume":"64","author":[{"given":"Scott R.","family":"Miller","sequence":"first","affiliation":[{"name":"<!--label omitted: 1-->Department of Biology, University of Oregon, Eugene, Oregon 97403"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Christopher E.","family":"Wingard","sequence":"additional","affiliation":[{"name":"<!--label omitted: 1-->Department of Biology, University of Oregon, Eugene, Oregon 97403"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Richard W.","family":"Castenholz","sequence":"additional","affiliation":[{"name":"<!--label omitted: 1-->Department of Biology, University of Oregon, Eugene, Oregon 97403"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"235","reference":[{"key":"e_1_3_2_2_2","unstructured":"Abacus Concepts\nSuperANOVA.\n1989\nAbacus Concepts Inc.\nBerkeley Calif"},{"key":"e_1_3_2_3_2","doi-asserted-by":"publisher","DOI":"10.1038\/214882a0"},{"key":"e_1_3_2_4_2","doi-asserted-by":"crossref","unstructured":"Brock\nT. 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