کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5783395 | 1637946 | 2017 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Biogeochemical N signatures from rate-yield trade-offs during in vitro chemosynthetic NO3â reduction by deep-sea vent ε-Proteobacteria and Aquificae growing at different temperatures
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
NO3â reduction is a metabolism that is widespread among ε-Proteobacteria and Aquificae, two abundant classes of microorganisms found at deep-sea vents. In this study, we used Sulfurovum lithotrophicum, Caminibacter mediatlanticus and Thermovibrio ammonificans as representatives of these groups to study ecophysiological, metabolic and biogeochemical parameters associated with chemolithoautotrophic NO3â reduction under different temperature regimes. We observed that while S. lithotrophicum and C. mediatlanticus achieved higher cell densities than T. ammonificans, the overall NO3â consumption by the latter was on average â¼9 and â¼5 times faster on a per cell basis, respectively. Comparison with previously published data from other cultured vent ε-Proteobacteria and Aquificae suggests that the rate-yield trade-offs observed in our experiments are generally conserved between these two groups in line with their ecophysiologies. Kinetic isotope effects of N from NO3â reduction were 9.6 ± 2.7â° for S. lithotrophicum, 6.4 ± 0.7â° for C. mediatlanticus and 8.8 ± 0.6â° for T. ammonificans. Our results help evaluate how metabolic partitioning between growth efficiency and reaction kinetics during chemolithoautotrophic NO3â reduction affect the concentration and isotope composition of N compounds at deep-sea hydrothermal vents.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Geochimica et Cosmochimica Acta - Volume 211, 15 August 2017, Pages 214-227
Journal: Geochimica et Cosmochimica Acta - Volume 211, 15 August 2017, Pages 214-227
نویسندگان
Ileana Pérez-RodrÃguez, Stefan M. Sievert, Marilyn L. Fogel, Dionysis I. Foustoukos,