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  1. Article ; Online: Biological controls on marine volatile organic compound emissions: A balancing act at the sea-air interface

    Halsey, Kimberly H. / Giovannoni, Stephen J.

    Earth-Science Reviews. 2023 May, v. 240 p.104360-

    2023  

    Abstract: Volatile organic compounds (VOCs) comprise a vast pool of low molecular weight and rapidly diffusible chemicals that are emitted from all cells as well as by photolysis of dissolved organic matter and burning of fossil fuels. In the ocean, VOCs are an ... ...

    Abstract Volatile organic compounds (VOCs) comprise a vast pool of low molecular weight and rapidly diffusible chemicals that are emitted from all cells as well as by photolysis of dissolved organic matter and burning of fossil fuels. In the ocean, VOCs are an important component of the marine carbon cycle, serving as plankton growth products and substrates and also as info-chemicals that influence phytoplankton life cycles. When VOCs are emitted from the ocean into the atmosphere, they alter Earth's radiative budget through oxidation reactions and secondary aerosol formation. Marine phytoplankton are the primary biotic source of marine VOCs, many of which are exploited as nutrient resources by ubiquitous bacterioplankton that have evolved specific mechanisms to consume these compounds. Thus, the balance of VOC production and consumption exerts control on the concentrations of dissolved VOCs at the sea-air interface. Current simulations of atmospheric chemistry do not take into account biological controls of dissolved VOCs. Linkages between phytoplankton communities, VOC composition, and surface ocean properties are promising avenues for improving the next generation of chemical transport models that quantify and predict VOC emissions. We suggest that VOC accumulation may be predictable by identifying periods when plankton communities are disrupted by biological or physical processes. Layered models that use remote sensing and ocean physics to measure the states and trajectories of plankton assemblages have promise for predicting ocean sea-air VOC transfer.
    Keywords aerosols ; atmospheric chemistry ; bacterioplankton ; carbon cycle ; dissolved organic matter ; molecular weight ; oxidation ; photolysis ; phytoplankton ; volatile organic compounds ; VOC production ; Biological VOC consumption ; Marine carbon cycling
    Language English
    Dates of publication 2023-05
    Publishing place Elsevier B.V.
    Document type Article ; Online
    Note Use and reproduction
    ZDB-ID 1792-9
    ISSN 0012-8252
    ISSN 0012-8252
    DOI 10.1016/j.earscirev.2023.104360
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  2. Article ; Online: SAR11 Bacteria: The Most Abundant Plankton in the Oceans.

    Giovannoni, Stephen J

    Annual review of marine science

    2017  Volume 9, Page(s) 231–255

    Abstract: SAR11 is a group of small, carbon-oxidizing bacteria that reach a global estimated population size of 2.4× ... ...

    Abstract SAR11 is a group of small, carbon-oxidizing bacteria that reach a global estimated population size of 2.4×10
    MeSH term(s) Bacteria/classification ; Bacteria/genetics ; Carbon ; Genes, Bacterial ; Oceans and Seas ; Plankton ; Water Microbiology
    Chemical Substances Carbon (7440-44-0)
    Language English
    Publishing date 2017--03
    Publishing country United States
    Document type Journal Article ; Research Support, U.S. Gov't, Non-P.H.S. ; Research Support, Non-U.S. Gov't
    ZDB-ID 2458404-6
    ISSN 1941-0611 ; 1941-1405
    ISSN (online) 1941-0611
    ISSN 1941-1405
    DOI 10.1146/annurev-marine-010814-015934
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  3. Article ; Online: A Reduction of Transcriptional Regulation in Aquatic Oligotrophic Microorganisms Enhances Fitness in Nutrient-Poor Environments.

    Noell, Stephen E / Hellweger, Ferdi L / Temperton, Ben / Giovannoni, Stephen J

    Microbiology and molecular biology reviews : MMBR

    2023  Volume 87, Issue 2, Page(s) e0012422

    Abstract: In this review, we consider the regulatory strategies of aquatic oligotrophs, microbial cells that are adapted to thrive under low-nutrient concentrations in oceans, lakes, and other aquatic ecosystems. Many reports have concluded that oligotrophs use ... ...

    Abstract In this review, we consider the regulatory strategies of aquatic oligotrophs, microbial cells that are adapted to thrive under low-nutrient concentrations in oceans, lakes, and other aquatic ecosystems. Many reports have concluded that oligotrophs use less transcriptional regulation than copiotrophic cells, which are adapted to high nutrient concentrations and are far more common subjects for laboratory investigations of regulation. It is theorized that oligotrophs have retained alternate mechanisms of regulation, such as riboswitches, that provide shorter response times and smaller amplitude responses and require fewer cellular resources. We examine the accumulated evidence for distinctive regulatory strategies in oligotrophs. We explore differences in the selective pressures copiotrophs and oligotrophs encounter and ask why, although evolutionary history gives copiotrophs and oligotrophs access to the same regulatory mechanisms, they might exhibit distinctly different patterns in how these mechanisms are used. We discuss the implications of these findings for understanding broad patterns in the evolution of microbial regulatory networks and their relationships to environmental niche and life history strategy. We ask whether these observations, which have emerged from a decade of increased investigation of the cell biology of oligotrophs, might be relevant to recent discoveries of many microbial cell lineages in nature that share with oligotrophs the property of reduced genome size.
    MeSH term(s) Humans ; Bacteria/genetics ; Ecosystem ; Adaptation, Physiological ; Gene Expression Regulation
    Language English
    Publishing date 2023-03-30
    Publishing country United States
    Document type Journal Article ; Review ; Research Support, U.S. Gov't, Non-P.H.S. ; Research Support, Non-U.S. Gov't
    ZDB-ID 1376131-6
    ISSN 1098-5557 ; 1070-6275 ; 1092-2172
    ISSN (online) 1098-5557 ; 1070-6275
    ISSN 1092-2172
    DOI 10.1128/mmbr.00124-22
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    In stock of ZB MED Cologne/Königswinter

    Ud II Zs.96: Show issues Location:
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    bis Jg. 2021: Bestellungen von Artikeln über das Online-Bestellformular
    ab Jg. 2022: Lesesaal (EG)

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  4. Article: An Expanded Genetic Code Enables Trimethylamine Metabolism in Human Gut Bacteria.

    Kivenson, Veronika / Giovannoni, Stephen J

    mSystems

    2020  Volume 5, Issue 5

    Abstract: Cardiovascular disease (CVD) has been linked to animal-based diets, which are a major source of trimethylamine (TMA), a precursor of the proatherogenic compound trimethylamine- ...

    Abstract Cardiovascular disease (CVD) has been linked to animal-based diets, which are a major source of trimethylamine (TMA), a precursor of the proatherogenic compound trimethylamine-
    Language English
    Publishing date 2020-10-27
    Publishing country United States
    Document type Journal Article
    ISSN 2379-5077
    ISSN 2379-5077
    DOI 10.1128/mSystems.00413-20
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  5. Article ; Online: Cultivation of marine bacteria of the SAR202 clade.

    Lim, Yeonjung / Seo, Ji-Hui / Giovannoni, Stephen J / Kang, Ilnam / Cho, Jang-Cheon

    Nature communications

    2023  Volume 14, Issue 1, Page(s) 5098

    Abstract: Bacteria of the SAR202 clade, within the phylum Chloroflexota, are ubiquitously distributed in the ocean but have not yet been cultivated in the lab. It has been proposed that ancient expansions of catabolic enzyme paralogs broadened the spectrum of ... ...

    Abstract Bacteria of the SAR202 clade, within the phylum Chloroflexota, are ubiquitously distributed in the ocean but have not yet been cultivated in the lab. It has been proposed that ancient expansions of catabolic enzyme paralogs broadened the spectrum of organic compounds that SAR202 bacteria could oxidize, leading to transformations of the Earth's carbon cycle. Here, we report the successful cultivation of SAR202 bacteria from surface seawater using dilution-to-extinction culturing. The growth of these strains is very slow (0.18-0.24 day
    MeSH term(s) Bacteria/genetics ; Archaea ; Chloroflexi ; Carbon Cycle ; Fucose
    Chemical Substances Fucose (28RYY2IV3F)
    Language English
    Publishing date 2023-08-22
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-023-40726-8
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  6. Article ; Online: Differences in the regulatory strategies of marine oligotrophs and copiotrophs reflect differences in motility.

    Noell, Stephen E / Brennan, Elizabeth / Washburn, Quinn / Davis, Edward W / Hellweger, Ferdi L / Giovannoni, Stephen J

    Environmental microbiology

    2023  Volume 25, Issue 7, Page(s) 1265–1280

    Abstract: Aquatic bacteria frequently are divided into lifestyle categories oligotroph or copiotroph. Oligotrophs have proportionately fewer transcriptional regulatory genes than copiotrophs and are generally non-motile/chemotactic. We hypothesized that the ... ...

    Abstract Aquatic bacteria frequently are divided into lifestyle categories oligotroph or copiotroph. Oligotrophs have proportionately fewer transcriptional regulatory genes than copiotrophs and are generally non-motile/chemotactic. We hypothesized that the absence of chemotaxis/motility in oligotrophs prevents them from occupying nutrient patches long enough to benefit from transcriptional regulation. We first confirmed that marine oligotrophs are generally reduced in genes for transcriptional regulation and motility/chemotaxis. Next, using a non-motile oligotroph (Ca. Pelagibacter st. HTCC7211), a motile copiotroph (Alteromonas macleodii st. HOT1A3), and [
    MeSH term(s) Bacteria/genetics ; Chemotaxis/genetics ; Alphaproteobacteria ; Oxidation-Reduction
    Language English
    Publishing date 2023-03-04
    Publishing country England
    Document type Journal Article ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 2020213-1
    ISSN 1462-2920 ; 1462-2912
    ISSN (online) 1462-2920
    ISSN 1462-2912
    DOI 10.1111/1462-2920.16357
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  7. Article ; Online: SAR11 bacteria have a high affinity and multifunctional glycine betaine transporter.

    Noell, Stephen E / Giovannoni, Stephen J

    Environmental microbiology

    2019  Volume 21, Issue 7, Page(s) 2559–2575

    Abstract: Marine bacterioplankton face stiff competition for limited nutrient resources. SAR11, a ubiquitous clade of very small and highly abundant Alphaproteobacteria, are known to devote much of their energy to synthesizing ATP-binding cassette periplasmic ... ...

    Abstract Marine bacterioplankton face stiff competition for limited nutrient resources. SAR11, a ubiquitous clade of very small and highly abundant Alphaproteobacteria, are known to devote much of their energy to synthesizing ATP-binding cassette periplasmic proteins that bind substrates. We hypothesized that their small size and relatively large periplasmic space might enable them to outcompete other bacterioplankton for nutrients. Using uptake experiments with
    MeSH term(s) Alphaproteobacteria/classification ; Alphaproteobacteria/genetics ; Alphaproteobacteria/metabolism ; Bacterial Proteins/genetics ; Bacterial Proteins/metabolism ; Betaine/metabolism ; GABA Plasma Membrane Transport Proteins/genetics ; GABA Plasma Membrane Transport Proteins/metabolism ; Glycine/metabolism ; Plankton/genetics ; Plankton/metabolism ; Seawater/microbiology
    Chemical Substances Bacterial Proteins ; GABA Plasma Membrane Transport Proteins ; betaine plasma membrane transport proteins (146313-33-9) ; Betaine (3SCV180C9W) ; Glycine (TE7660XO1C)
    Language English
    Publishing date 2019-05-21
    Publishing country England
    Document type Journal Article ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 2020213-1
    ISSN 1462-2920 ; 1462-2912
    ISSN (online) 1462-2920
    ISSN 1462-2912
    DOI 10.1111/1462-2920.14649
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  8. Article ; Online: Differences in the regulatory strategies of marine oligotrophs and copiotrophs reflect differences in motility

    Noell, Stephen E. / Brennan, Elizabeth / Washburn, Quinn / Davis, Edward W., II / Hellweger, Ferdi L. / Giovannoni, Stephen J.

    Environmental Microbiology. 2023 July, v. 25, no. 7 p.1265-1280

    2023  

    Abstract: Aquatic bacteria frequently are divided into lifestyle categories oligotroph or copiotroph. Oligotrophs have proportionately fewer transcriptional regulatory genes than copiotrophs and are generally non‐motile/chemotactic. We hypothesized that the ... ...

    Abstract Aquatic bacteria frequently are divided into lifestyle categories oligotroph or copiotroph. Oligotrophs have proportionately fewer transcriptional regulatory genes than copiotrophs and are generally non‐motile/chemotactic. We hypothesized that the absence of chemotaxis/motility in oligotrophs prevents them from occupying nutrient patches long enough to benefit from transcriptional regulation. We first confirmed that marine oligotrophs are generally reduced in genes for transcriptional regulation and motility/chemotaxis. Next, using a non‐motile oligotroph (Ca. Pelagibacter st. HTCC7211), a motile copiotroph (Alteromonas macleodii st. HOT1A3), and [¹⁴C]l‐alanine, we confirmed that l‐alanine catabolism is not transcriptionally regulated in HTCC7211 but is in HOT1A3. We then found that HOT1A3 took 2.5–4 min to initiate l‐alanine oxidation at patch l‐alanine concentrations, compared to <30 s for HTCC7211. By modelling cell trajectories, we predicted that, in most scenarios, non‐motile cells spend <2 min in patches, compared to >4 min for chemotactic/motile cells. Thus, the time necessary for transcriptional regulation to initiate prevents transcriptional regulation from being beneficial for non‐motile oligotrophs. This is supported by a mechanistic model we developed, which predicted that HTCC7211 cells with transcriptional regulation of l‐alanine metabolism would produce 12% of their standing ATP stock upon encountering an l‐alanine patch, compared to 880% in HTCC7211 cells without transcriptional regulation.
    Keywords Alteromonas macleodii ; alanine ; catabolism ; chemotaxis ; lifestyle ; mechanistic models ; microbiology ; oxidation ; transcription (genetics)
    Language English
    Dates of publication 2023-07
    Size p. 1265-1280.
    Publishing place John Wiley & Sons, Inc.
    Document type Article ; Online
    Note JOURNAL ARTICLE
    ZDB-ID 2020213-1
    ISSN 1462-2920 ; 1462-2912
    ISSN (online) 1462-2920
    ISSN 1462-2912
    DOI 10.1111/1462-2920.16357
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  9. Article: Genomes from Uncultivated Pelagiphages Reveal Multiple Phylogenetic Clades Exhibiting Extensive Auxiliary Metabolic Genes and Cross-Family Multigene Transfers.

    Wittmers, Fabian / Needham, David M / Hehenberger, Elisabeth / Giovannoni, Stephen J / Worden, Alexandra Z

    mSystems

    2022  Volume 7, Issue 5, Page(s) e0152221

    Abstract: For the abundant marine ... ...

    Abstract For the abundant marine Alphaproteobacterium
    Language English
    Publishing date 2022-08-16
    Publishing country United States
    Document type Journal Article
    ISSN 2379-5077
    ISSN 2379-5077
    DOI 10.1128/msystems.01522-21
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  10. Article ; Online: Vitamins in the sea.

    Giovannoni, Stephen J

    Proceedings of the National Academy of Sciences of the United States of America

    2012  Volume 109, Issue 35, Page(s) 13888–13889

    MeSH term(s) Marine Biology/methods ; Phytoplankton/metabolism ; Seawater/chemistry ; Seawater/microbiology ; Vitamin B Complex/metabolism
    Chemical Substances Vitamin B Complex (12001-76-2)
    Language English
    Publishing date 2012-08-13
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S. ; Comment
    ZDB-ID 209104-5
    ISSN 1091-6490 ; 0027-8424
    ISSN (online) 1091-6490
    ISSN 0027-8424
    DOI 10.1073/pnas.1211722109
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    In stock of ZB MED Cologne/Königswinter

    Zs.A 1148: Show issues Location:
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    Jg. 1995 - 2021: Lesesall (1.OG)
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