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Bruce N. Bjornstad
Researcher at Pacific Northwest National Laboratory
Publications - 70
Citations - 2063
Bruce N. Bjornstad is an academic researcher from Pacific Northwest National Laboratory. The author has contributed to research in topics: Vadose zone & Hanford Site. The author has an hindex of 25, co-authored 70 publications receiving 2008 citations. Previous affiliations of Bruce N. Bjornstad include Environmental Molecular Sciences Laboratory.
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Journal ArticleDOI
Pore‐size constraints on the activity and survival of subsurface bacteria in a late cretaceous shale‐sandstone sequence, northwestern New Mexico
James K. Fredrickson,James P. McKinley,Bruce N. Bjornstad,Philip E. Long,David B. Ringelberg,David C. White,Lee R. Krumholz,Joseph M. Suflita,F.S. Colwell,R. M. Lehman,Tommy J. Phelps,Tullis C. Onstott +11 more
TL;DR: In this article, 24 shale and sandstone cores were collected from a site in northwestern New Mexico to investigate the distribution of microbial biomass and activities to gain insights into the physical controls on microbial activity and potential long-term survival in the subsurface.
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Microbiology of vadose zone paleosols in south-central Washington State.
Fred J. Brockman,Thomas L. Kieft,James K. Fredrickson,Bruce N. Bjornstad,S. W. Li,Walt Spangenburg,Philip E. Long +6 more
TL;DR: Storage at 4°C of subsurface and near-surface paleosol samples containing high water potential increased the population of culturable aerobic heterotrophs, decreased diversity in colony morphology, and increased first-order rate constants and decreased lag times for glucose mineralization.
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Vertical stratification of subsurface microbial community composition across geological formations at the Hanford Site
TL;DR: Microbial diversity in subsurface sediments at the Hanford Site 300 Area near Richland, Washington state (USA) was investigated by analysing 21 samples recovered from depths of 9-52 m and detected 1233 and 120 unique bacterial and archaeal OTUs (operational taxonomic units at the 97% identity level) respectively.
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Microbial abundance and activities in relation to water potential in the vadose zones of arid and semiarid sites.
Thomas L. Kieft,Penny S. Amy,Fred J. Brockman,James K. Fredrickson,Bruce N. Bjornstad,Laurie L. Rosacker +5 more
TL;DR: Water limited mineralization in some, but not all samples, suggesting that an inorganic nutrient or other factor may limit microbial activities in some vadose zone environments.
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Microbial community structure and biogeochemistry of Miocene subsurface sediments: implications for long-term microbial survival
James K. Fredrickson,James P. McKinley,S. A. Nierzwicki-Bauer,David C. White,David B. Ringelberg,S. A. Rawson,Shu-Mei Li,Fred J. Brockman,Bruce N. Bjornstad +8 more
TL;DR: The results suggest that the current subsurface microbial population was derived from organisms that were present during lake sedimentation = 6–8 million years ago.