Julie LaRoche

Lateral gene transfer shapes the distribution of nitrogen fixation within a cosmopolitan clade of marine Thalassolituus

Soma Sardar Barawi, Julie LaRoche, Robert G. Beiko

Abstract Biological nitrogen fixation converts dinitrogen gas into ammonia, supplying new bioavailable nitrogen to marine ecosystems, but the evolutionary processes shaping its distribution among heterotrophic bacteria remain unresolved. Thalassolituus , a genus within the family Oceanospirillaceae (order Oceanospirillales), is best known for …

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Development of a lightweight, fully integrated qPCR sensor for environmental DNA

Edward Luy, Colin Sonnichsen, Andre Hendricks, Iain Grundke et autres

Environmental DNA (eDNA) has emerged in recent years as a powerful tool in ecological monitoring. However, conventional eDNA methods are bottlenecked by long wait times due to sample transport and lab analysis. We present a compact and portable eDNA sensor to enable …

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Thalassolituus haligoni sp. nov., BB40, a model species for non-cyanobacterial diazotrophs within Oceanospirillales isolated from a Fjord-like Inlet in Kjipuktuk

Sonja A. Rose, Stephanie. L.G. Duffy, Ludovic Pascal, Gwénaëlle Chaillou et autres

Abstract Marine non-cyanobacterial diazotrophs (NCDs) are recognized as globally distributed, however, few representatives have been isolated in pure cultures. As a result, understanding the physiology, growth rate, substrate preference and dinitrogen (N 2 ) fixation capabilities proves difficult. Thalassolituus haligoni . sp. …

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Development of a Lightweight, Fully Integrated Submersible qPCR Sensor for Environmental DNA

Colin Sonnichsen, Edward Luy, Andre Hendricks, Iain Grundke et autres

Prof Stephen P. Long, FRS (1950–2025)

Lorenzo Álvarez‐Filip, Edith Bai, Carl J. Bernacchi, Rhea Bruno et autres

Non peer reviewed

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Prof Stephen P. Long, FRS (1950–2025)

Lorenzo Álvarez‐Filip, Edith Bai, Carl J. Bernacchi, Rhea Bruno et autres

Y

mx, cn, us, dk, au, tw, ca, Afrique du Sud, be, kr, gb, nz, jp, fi, Eswatini, es, br, il, sa, hk (code pays fourni par la source)

Seasonal patterns in B‐vitamins and cobalamin co‐limitation in the Northwest Atlantic

Catherine C. Bannon, Patrick L. White, Elden Rowland, Kiran J. More et autres

Abstract B‐vitamins are important co‐enzymes that have long been hypothesized to play key roles in marine ecosystems. However, environmental measurements remain scarce, which limits our understanding of their potential impact. Here, we present mass spectrometry‐based measurements of B‐vitamins (B 1 , B …

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Organellar Genomes of Three Globally Important Nanoplanktonic Diatoms Refine Their Taxon‐Specific Distribution and Succession Patterns in the Northwest Atlantic

Rebecca Stevens‐Green, Caroline Chénard, Solenn Mordret, Jenna F. MacKinnon et autres

Nanoplanktonic diatoms (2-20 μm) are a significant yet historically understudied component of marine ecosystems. We investigated three recently isolated nanoplanktonic diatoms from the Northwest Atlantic Ocean (NWA): Minidiscus spinulatus, Mediolabrus comicus, and Minidiscus trioculatus. Using Oxford Nanopore sequencing, we assembled and annotated …

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Comparison of spatio-temporal dynamics and composition in size-fractionated and unfractionated Northwestern Atlantic microbial communities

Diana Haider, Jennifer Tolman, Robert G. Beiko, Julie LaRoche

Abstract Size fractionation is a widely applied approach to target specific microbial size ranges, differentiating between larger particle-associated, and smaller free-living microorganisms. To characterize its impact on microbial diversity and its comparability to unfractionated samples, we analyzed 16 weekly ocean samples across …

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Diverse community of rhizobia-diatom symbioses fixes nitrogen in the South Pacific gyre

Mertcan Esti, Miriam Philippi, Julia Duerschlag, Timothy G. Ferdelman et autres

Abstract Nitrogen fixation is crucial for sustaining productivity in most of the open ocean. Cyanobacteria are the most prominent N2-fixers, but based on the nifH gene, a marker gene of the enzyme that fixes N2 into ammonia, non-cyanobacterial N2-fixers often predominate the …

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Seasonal patterns in b-vitamins and cobalamin co-limitation in the Northwest Atlantic

Catherine C. Bannon, Patrick L. White, Elden Rowland, Kiran J. More et autres

Abstract B-vitamins are important co-enzymes that have long been hypothesized to play key roles in marine ecosystems. However, environmental measurements remain scarce, which limits our understanding of their potential impact. Here, we present mass spectrometry-based measurements of b-vitamins (B 1 , B …

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Production and utilization of pseudocobalamin in marine Synechococcus cultures and communities

Catherine C. Bannon, Maria A. Soto, Elden Rowland, Nan Chen et autres

Cobalamin influences marine microbial communities because an exogenous source is required by most eukaryotic phytoplankton, and demand can exceed supply. Pseudocobalamin is a cobalamin analogue produced and used by most cyanobacteria but is not directly available to eukaryotic phytoplankton. Some microbes can …

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