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  1. Article ; Online: Unsolved mysteries in marine nitrogen fixation.

    Zehr, Jonathan P / Capone, Douglas G

    Trends in microbiology

    2023  

    Abstract: Biological nitrogen ( ... ...

    Abstract Biological nitrogen (N
    Language English
    Publishing date 2023-08-30
    Publishing country England
    Document type Journal Article ; Review
    ZDB-ID 1158963-2
    ISSN 1878-4380 ; 0966-842X
    ISSN (online) 1878-4380
    ISSN 0966-842X
    DOI 10.1016/j.tim.2023.08.004
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    In stock of ZB MED Cologne/Königswinter

    Zs.A 3738: Show issues Location:
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  2. Article ; Online: Unsolved mysteries in marine nitrogen fixation

    Zehr, Jonathan P. / Capone, Douglas G.

    Trends in Microbiology.

    2023  

    Abstract: Biological nitrogen (N₂) fixation is critical in global biogeochemical cycles and in sustaining the productivity of the oceans. There remain many unanswered questions, unresolved hypotheses, and unchallenged paradigms. The fundamental balance of N input ... ...

    Abstract Biological nitrogen (N₂) fixation is critical in global biogeochemical cycles and in sustaining the productivity of the oceans. There remain many unanswered questions, unresolved hypotheses, and unchallenged paradigms. The fundamental balance of N input and losses has not been fully resolved. One of the major N₂-fixers, Trichodesmium, remains an enigma with intriguing biological and ecological secrets. Cyanobacterial N₂ fixation, once thought to be primarily due to free-living cyanobacteria, now also appears to be dependent on microbial interactions, from microbiomes to unicellular symbioses, which remain poorly characterized. Nitrogenase genes associated with diverse non-cyanobacterial diazotrophs (NCDs) are prevalent, but their significance remains a huge knowledge gap. Answering questions, new and old, such as those in this paper are needed to understand the ocean's N and C cycle and their response to environmental change.
    Keywords Trichodesmium ; microbiome ; nitrogen ; nitrogen fixation ; nitrogen-fixing bacteria ; nitrogenase ; marine nitrogen fixation ; diazotrophs
    Language English
    Publishing place Elsevier Ltd
    Document type Article ; Online
    Note Pre-press version
    ZDB-ID 1158963-2
    ISSN 1878-4380 ; 0966-842X
    ISSN (online) 1878-4380
    ISSN 0966-842X
    DOI 10.1016/j.tim.2023.08.004
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    In stock of ZB MED Bonn / Germany

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  3. Article ; Online: Intensification of harmful cyanobacterial blooms in a eutrophic, temperate lake caused by nitrogen, temperature, and CO

    Kramer, Benjamin J / Turk-Kubo, Kendra / Zehr, Jonathan P / Gobler, Christopher J

    The Science of the total environment

    2024  Volume 915, Page(s) 169885

    Abstract: Warmer temperatures can significantly increase the intensity of cyanobacterial harmful algal blooms (CHABs) in eutrophic freshwater ecosystems. However, few studies have examined the effects of ... ...

    Abstract Warmer temperatures can significantly increase the intensity of cyanobacterial harmful algal blooms (CHABs) in eutrophic freshwater ecosystems. However, few studies have examined the effects of CO
    MeSH term(s) Lakes/microbiology ; Carbon Dioxide ; Temperature ; Ecosystem ; Nitrogen ; RNA, Ribosomal, 16S ; Cyanobacteria ; Eutrophication
    Chemical Substances Carbon Dioxide (142M471B3J) ; Nitrogen (N762921K75) ; RNA, Ribosomal, 16S
    Language English
    Publishing date 2024-01-06
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 121506-1
    ISSN 1879-1026 ; 0048-9697
    ISSN (online) 1879-1026
    ISSN 0048-9697
    DOI 10.1016/j.scitotenv.2024.169885
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    In stock of ZB MED Cologne/Königswinter

    Zs.A 949: Show issues Location:
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  4. Article ; Online: Metabolic trade-offs constrain the cell size ratio in a nitrogen-fixing symbiosis.

    Cornejo-Castillo, Francisco M / Inomura, Keisuke / Zehr, Jonathan P / Follows, Michael J

    Cell

    2024  Volume 187, Issue 7, Page(s) 1762–1768.e9

    Abstract: Biological dinitrogen ( ... ...

    Abstract Biological dinitrogen (N
    MeSH term(s) Cyanobacteria/metabolism ; Haptophyta/cytology ; Haptophyta/metabolism ; Haptophyta/microbiology ; Nitrogen/metabolism ; Nitrogen Fixation ; Symbiosis
    Chemical Substances Nitrogen (N762921K75)
    Language English
    Publishing date 2024-03-11
    Publishing country United States
    Document type Journal Article
    ZDB-ID 187009-9
    ISSN 1097-4172 ; 0092-8674
    ISSN (online) 1097-4172
    ISSN 0092-8674
    DOI 10.1016/j.cell.2024.02.016
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    In stock of ZB MED Cologne/Königswinter

    Zs.A 1167: Show issues Location:
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    Zs.MG 58: Show issues

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  5. Article ; Online: Open ocean and coastal strains of the N2-fixing cyanobacterium UCYN-A have distinct transcriptomes.

    Muñoz-Marín, María Del Carmen / Magasin, Jonathan D / Zehr, Jonathan P

    PloS one

    2023  Volume 18, Issue 5, Page(s) e0272674

    Abstract: Decades of research on marine N2 fixation focused on Trichodesmium, which are generally free-living cyanobacteria, but in recent years the endosymbiotic cyanobacterium Candidatus Atelocyanobacterium thalassa (UCYN-A) has received increasing attention. ... ...

    Abstract Decades of research on marine N2 fixation focused on Trichodesmium, which are generally free-living cyanobacteria, but in recent years the endosymbiotic cyanobacterium Candidatus Atelocyanobacterium thalassa (UCYN-A) has received increasing attention. However, few studies have shed light on the influence of the host versus the habitat on UCYN-A N2 fixation and overall metabolism. Here we compared transcriptomes from natural populations of UCYN-A from oligotrophic open-ocean versus nutrient-rich coastal waters, using a microarray that targets the full genomes of UCYN-A1 and UCYN-A2 and known genes for UCYN-A3. We found that UCYN-A2, usually regarded as adapted to coastal environments, was transcriptionally very active in the open ocean and appeared to be less impacted by habitat change than UCYN-A1. Moreover, for genes with 24 h periodic expression we observed strong but inverse correlations among UCYN-A1, A2, and A3 to oxygen and chlorophyll, which suggests distinct host-symbiont relationships. Across habitats and sublineages, genes for N2 fixation and energy production had high transcript levels, and, intriguingly, were among the minority of genes that kept the same schedule of diel expression. This might indicate different regulatory mechanisms for genes that are critical to the symbiosis for the exchange of nitrogen for carbon from the host. Our results underscore the importance of N2 fixation in UCYN-A symbioses across habitats, with consequences for community interactions and global biogeochemical cycles.
    MeSH term(s) Seawater/microbiology ; Transcriptome ; Cyanobacteria/genetics ; Cyanobacteria/metabolism ; Nitrogen Fixation/genetics ; Oceans and Seas ; Nitrogen/metabolism
    Chemical Substances Nitrogen (N762921K75)
    Language English
    Publishing date 2023-05-02
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2267670-3
    ISSN 1932-6203 ; 1932-6203
    ISSN (online) 1932-6203
    ISSN 1932-6203
    DOI 10.1371/journal.pone.0272674
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  6. Article ; Online: Changing perspectives in marine nitrogen fixation.

    Zehr, Jonathan P / Capone, Douglas G

    Science (New York, N.Y.)

    2020  Volume 368, Issue 6492

    Abstract: Nitrogen fixation, the reduction of atmospheric dinitrogen gas ( ... ...

    Abstract Nitrogen fixation, the reduction of atmospheric dinitrogen gas (N
    MeSH term(s) Ammonia/chemical synthesis ; Carbon Dioxide/analysis ; Cyanobacteria/classification ; Cyanobacteria/metabolism ; Diatoms/microbiology ; Nitrogen Fixation ; Oceans and Seas ; Oxidation-Reduction ; Photosynthesis ; Phylogeny ; Seawater/chemistry ; Seawater/microbiology ; Symbiosis
    Chemical Substances Carbon Dioxide (142M471B3J) ; Ammonia (7664-41-7)
    Language English
    Publishing date 2020-06-10
    Publishing country United States
    Document type Journal Article ; Review
    ZDB-ID 128410-1
    ISSN 1095-9203 ; 0036-8075
    ISSN (online) 1095-9203
    ISSN 0036-8075
    DOI 10.1126/science.aay9514
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    In stock of ZB MED Cologne/Königswinter

    Zs.A 27: Show issues Location:
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    Zs.MG 77: Show issues

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  7. Article: Cell sorting reveals few novel prokaryote and photosynthetic picoeukaryote associations in the oligotrophic ocean

    Farnelid, Hanna / Turk‐Kubo, Kendra / Zehr, Jonathan P

    Environmental microbiology. 2021 Mar., v. 23, no. 3

    2021  

    Abstract: Close associations between single‐celled marine organisms can have a central role in biogeochemical processes and are of great interest for understanding the evolution of organisms. The global significance of such associations raises the question of ... ...

    Abstract Close associations between single‐celled marine organisms can have a central role in biogeochemical processes and are of great interest for understanding the evolution of organisms. The global significance of such associations raises the question of whether unidentified associations are yet to be discovered. In this study, fluorescence‐activated cell sorted photosynthetic picoeukayote (PPE) populations and single cells were analysed by sequencing of 16S rRNA genes in the oligotrophic North Pacific Subtropical Gyre. Samples were collected during two cruises, spanning depths near the deep chlorophyll maximum, where the abundance of PPEs was highest. The association between the widespread and significant nitrogen (N₂)‐fixing cyanobacterium, UCYN‐A and its prymnesiophyte host was prevalent in both population and single‐cell sorts. Several bacterial sequences, affiliating with previously described symbiotic taxa were detected but their detection was rare and not well replicated, precluding identification of novel tightly linked species‐specific associations. Similarly, no enrichment of dominant seawater taxa such as Prochlorococcus, SAR11 or Synechococcus was observed suggesting that these were not systematically ingested by the PPE in this study. The results indicate that apart from the UCYN‐A symbiosis, similar tight species‐specific associations with PPEs are unusual in the oligotrophic ocean.
    Keywords Prochlorococcus ; Synechococcus ; chlorophyll ; evolution ; microbiology ; nitrogen ; photosynthesis ; prokaryotic cells ; seawater ; symbiosis
    Language English
    Dates of publication 2021-03
    Size p. 1469-1480.
    Publishing place John Wiley & Sons, Inc.
    Document type Article
    Note NAL-AP-2-clean ; JOURNAL ARTICLE
    ZDB-ID 2020213-1
    ISSN 1462-2920 ; 1462-2912
    ISSN (online) 1462-2920
    ISSN 1462-2912
    DOI 10.1111/1462-2920.15351
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  8. Article: Primer design for the amplification of the ammonium transporter genes from the uncultured haptophyte algal species symbiotic with the marine nitrogen-fixing cyanobacterium UCYN-A1.

    Salas, Krystal / Cabello, Ana M / Turk-Kubo, Kendra A / Zehr, Jonathan P / Cornejo-Castillo, Francisco M

    Frontiers in microbiology

    2023  Volume 14, Page(s) 1130695

    Abstract: The multiple symbiotic partnerships between closely related species of the haptophyte ... ...

    Abstract The multiple symbiotic partnerships between closely related species of the haptophyte algae
    Language English
    Publishing date 2023-04-17
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2587354-4
    ISSN 1664-302X
    ISSN 1664-302X
    DOI 10.3389/fmicb.2023.1130695
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  9. Article ; Online: Diversity, Genomics, and Distribution of Phytoplankton-Cyanobacterium Single-Cell Symbiotic Associations.

    Foster, Rachel A / Zehr, Jonathan P

    Annual review of microbiology

    2019  Volume 73, Page(s) 435–456

    Abstract: Cyanobacteria are common in symbiotic relationships with diverse multicellular organisms (animals, plants, fungi) in terrestrial environments and with single-celled heterotrophic, mixotrophic, and autotrophic protists in aquatic environments. In the ... ...

    Abstract Cyanobacteria are common in symbiotic relationships with diverse multicellular organisms (animals, plants, fungi) in terrestrial environments and with single-celled heterotrophic, mixotrophic, and autotrophic protists in aquatic environments. In the sunlit zones of aquatic environments, diverse cyanobacterial symbioses exist with autotrophic taxa in phytoplankton, including dinoflagellates, diatoms, and haptophytes (prymnesiophytes). Phototrophic unicellular cyanobacteria related to
    MeSH term(s) Biodiversity ; Cyanobacteria/classification ; Cyanobacteria/growth & development ; Endophytes/classification ; Endophytes/growth & development ; Host Microbial Interactions ; Nitrogen Fixation ; Phototrophic Processes ; Phytoplankton/microbiology ; Phytoplankton/physiology ; Symbiosis
    Language English
    Publishing date 2019-09-09
    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. ; Review
    ZDB-ID 207931-8
    ISSN 1545-3251 ; 0066-4227
    ISSN (online) 1545-3251
    ISSN 0066-4227
    DOI 10.1146/annurev-micro-090817-062650
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    In stock of ZB MED Cologne/Königswinter

    Se 30: Show issues Location:
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  10. Article ; Online: EVOLUTION. How single cells work together.

    Zehr, Jonathan P

    Science (New York, N.Y.)

    2015  Volume 349, Issue 6253, Page(s) 1163–1164

    MeSH term(s) Animals ; Biological Evolution ; Cyanobacteria/physiology ; Diatoms/physiology ; Nitrogen Fixation ; Organelles/physiology ; Symbiosis
    Language English
    Publishing date 2015-09-11
    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.
    ZDB-ID 128410-1
    ISSN 1095-9203 ; 0036-8075
    ISSN (online) 1095-9203
    ISSN 0036-8075
    DOI 10.1126/science.aac9752
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    In stock of ZB MED Cologne/Königswinter

    Zs.A 27: Show issues Location:
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    Zs.MG 77: Show issues

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