Publications by authors named "Jason P Kase"
Article Synopsis
- - The study examined how ozone-depleted air affects UVB radiation and its impact on marine bacteria at Palmer Station, Antarctica, between September and November 1999, revealing a 57% decline in bacterial concentrations during low total column ozone (TCO) periods.
- - Photoinhibition from UVB significantly reduced the bacteria's ability to incorporate radioactive leucine and thymidine, with maximum inhibition occurring in the afternoon and evening when UV exposure was highest.
- - Recovery of bacterial production after UV-induced damage was delayed compared to the recovery of TCO levels, indicating that extensive energy was needed to repair UV-related DNA damage, which could disrupt bacterial growth for an extended time.
Ultraviolet radiation-induced DNA damage frequencies were measured in DNA dosimeters and natural plankton communities during the austral spring at Palmer Station, Antarctica, during the 1999-2000 field season. We found that the fluence of solar ultraviolet-B radiation (UV-B) at the earth's surface correlated with stratospheric ozone concentrations, with significant ozone depletion observed because of "ozone hole" conditions. To verify the interdependence of ozone depletion and DNA damage in natural microbial communities, seawater was collected daily or weekly from Arthur Harbor at Palmer Station, Antarctica, throughout "ozone season," exposed to ambient sunlight between 0600 and 1800 h and fractionated using membrane filtration to separate phytoplankton and bacterioplankton populations.
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