U
Ulla Li Zweifel
Researcher at University of Gothenburg
Publications - 29
Citations - 3619
Ulla Li Zweifel is an academic researcher from University of Gothenburg. The author has contributed to research in topics: Bacterioplankton & Dissolved organic carbon. The author has an hindex of 23, co-authored 29 publications receiving 3496 citations. Previous affiliations of Ulla Li Zweifel include Umeå University & Linnaeus University.
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Significance of size and nucleic acid content heterogeneity as measured by flow cytometry in natural planktonic bacteria.
TL;DR: In various experiments where predator pressure on bacteria had been reduced, the percentage contribution of HDNA bacteria to total bacterial numbers (%HDNA) increased, such that theHDNA bacteria are the dynamic members of the bacterial assemblage.
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P limitation of heterotrophic bacteria and phytoplankton in the northwest Mediterranean
TL;DR: It is suggested that the growth rates of not only phytoplankton, but also of heterotrophic bacteria, are P limited in this environment in summer, which has important implications for the dynamics of accumulation of dissolved organic carbon in the photic zone and thus for the carbon cycle of oceans.
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Total counts of marine bacteria include a large fraction of non-nucleoid-containing bacteria (ghosts).
Ulla Li Zweifel,Åke Hagström +1 more
TL;DR: In samples from the Baltic Sea, the North Sea, and the northeastern Mediterranean Sea, it is found that only a minor fraction of total counts can be scored as bacteria with nucleoids; therefore, a much lower number of bacteria that grow at rates higher than those previously estimated must be responsible for the measured bacterial production in these seas.
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Consumption of dissolved organic carbon by marine bacteria and demand for inorganic nutrients
TL;DR: Consumption of dissolved organic carbon by marine bacteria and demand for inorganic nutrients is studied in this article, where the authors propose a method to solve the problem of inorganic carbon depletion.
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Dominant marine bacterioplankton species found among colony-forming bacteria
TL;DR: The results showed that bacteria able to form colonies on solid media accounted for a large fraction of the bacterioplankton, suggesting that bacteriopLankton exhibit a seasonal succession analogous to phytoplanka.