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Ran Duan

@drduanran.bsky.social
230 followers 419 following 3 posts

PhD candidate at Marine and Environmental Biology @USC cyanobacteria/omics/evolution/climate change/trace metal

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Reposted by Ran Duan
Quanta Magazine @quantamagazine.org · 28/06/2026
We know how photosynthesis works in incredible molecular detail, but how this vital process evolved is far less clear. It seems the road to photosynthesis was far longer and stranger than anyone expected. www.quantamagazine.org/an-early-ste...
quantamagazine.org
An Early Step on the Long, Strange Road to Photosynthesis | Quanta Magazine
An ancient lineage of cyanobacteria is helping biologists uncover an early evolutionary stage of the mind-boggling process that turns light into life.
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Cameron Thrash @jcamthrash.bsky.social · 02/07/2026
Coordination of N2-fixing cell specialization and patterning in filamentous cyanobacteria by a uniquely structured σ factor www.pnas.org/doi/abs/10.1... #jcampubs
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Cyanotrans @cyanotrans.bsky.social · 29/06/2026
Iron-catalyzed active lipid peroxides drive ultrafast collective cell death in blooming algae | Science www.science.org/doi/10.1126/...
science.org
Iron-catalyzed active lipid peroxides drive ultrafast collective cell death in blooming algae
Harmful algal blooms, the most severe ecological hazards worldwide, terminate abruptly within a few days. In this work, we identified that iron-catalyzed active lipid peroxides predominantly trigger i...
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Cameron Thrash @jcamthrash.bsky.social · 18/06/2026
The dynamic mesoscale sink and source niches for eukaryotic phytoplankton in a subtropical gyre www.pnas.org/doi/abs/10.1... #jcampubs 🌊
pnas.org
The dynamic mesoscale sink and source niches for eukaryotic phytoplankton in a subtropical gyre | PNAS
By tracking the water mass histories of genetic samples, we investigated the biophysical dynamics shaping eukaryotic phytoplankton populations in a...
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Chuliang Song @clsong.com · 16/06/2026
Spent the last two years developing a new Intro to Physics course for undergrad biology majors. It features tons of examples from biology (especially Ecology & Evolution!) and requires only middle school-level math. Lecture note here shorturl.at/0PiVp Any comments or feedback are highly welcome!
drive.google.com
physics_for_biologists.pdf
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Tominaga K. (tomiken) @pacyc184.bsky.social · 18/06/2026
Abiotic sources of fixed nitrogen sustained early ecosystems for several hundred million years after the origin of life | Science Advances www.science.org/doi/full/10.1126/sc…
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Tominaga K. (tomiken) @pacyc184.bsky.social · 10/06/2026
Tracing the evolution of microbial alkaline phosphatases and their role in phosphorus recycling through time | bioRxiv www.biorxiv.org/content/10.64898/20…
biorxiv.org
Tracing the evolution of microbial alkaline phosphatases and their role in phosphorus recycling through time
Phosphorus (P) recycling in seawater is critical for maintaining nutrient availability and marine primary productivity. This process is catalyzed by alkaline phosphatases enzymes, which hydrolyze dissolved organic phosphorus (DOP) compounds, releasing inorganic P for cellular assimilation. Here, we reconstructed the evolutionary history of three major alkaline phosphatase families through deep time using phylogenetic reconciliation across the tree of life. We further quantified their distribution and cellular localization across major metabolic groups using extant genomes to assess how the oceans capacity for P regeneration has changed through time. Our results demonstrate that alkaline phosphatases emerged early in the Archaean, indicating that DOP has sustained marine ecosystems for most of Earths history. A pronounced expansion and diversification of alkaline phosphatases occurred during the Neoproterozoic, coinciding with the rise and ecological diversification of algae. Across metabolic groups, extracellular alkaline phosphatases are particularly concentrated in ferric iron reducers, fermenters, and aerobic heterotrophs, but are comparatively rare in other metabolisms. This distribution suggests that the efficiency of marine P recycling has been strongly influenced by prevailing metabolic strategies and environmental redox conditions. Overall, our results provide new insights into the enzymatic drivers of marine P cycling and the mechanisms that maintained marine productivity as Earths surface became progressively oxygenated and biologically complex. ### Competing Interest Statement The authors have declared no competing interest. Heising-Simons Foundation, https://ror.org/01mp52y34
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Cameron Thrash @jcamthrash.bsky.social · 04/06/2026
Polyphosphate synthesis is essential for phosphate and ATP homeostasis during nutrient upshift www.pnas.org/doi/10.1073/... #jcampubs
pnas.org
Polyphosphate synthesis is essential for phosphate and ATP homeostasis during nutrient upshift | PNAS
Inorganic polyphosphate (polyP) is a ubiquitous molecule found across all domains of life. Although implicated in diverse cellular processes, inclu...
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Cameron Thrash @jcamthrash.bsky.social · 04/06/2026
Non-diazotrophic Trichodesmium species are active in N2 fixing colonies #USC_MEB #jcampubs 🌊 academic.oup.com/ismecommun/a...
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Nature Portfolio @natureportfolio.nature.com · 29/05/2026
The multistable dynamics of the Atlantic Ocean circulation pose a central problem in climate physics, because instabilities of the flows can have large climate impacts. A Review in Nature Reviews Physics unifies much of the model behaviour that has been found. go.nature.com/49HW9kQ ⚛️🌊🧪
This is figure 1, which shows the Atlantic Ocean circulation.
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Nature Ecology & Evolution @natecoevo.nature.com · 14/05/2026
This month we launch a Focus issue on the impacts of extreme events on biodiversity, highlighting research and opinion pieces on their variable impacts, short- and long-term consequences, and conservation measures to mitigate their effects: www.nature.com/collections/... Read more 👇
nature.com
Impacts of extreme events on biodiversity
Climate warming is increasing the frequency and intensity of extreme events globally, including heatwaves, cold snaps, droughts, floods and wildfires.
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Prof Alessandro Tagliabue @altagliabue.bsky.social · 09/05/2026
Why do climate models disagree so much in forecasting ocean net primary production under different emissions scenarios? Check out this new paper by @natlegrix.bsky.social and I 🌊 agupubs.onlinelibrary.wiley.com/doi/10.1029/...
agupubs.onlinelibrary.wiley.com
Sources of Uncertainty in Ocean Net Primary Productivity Projections Under Climate Change
Disagreement on the preindustrial state of net primary productivity (NPP) dominates the uncertainty in absolute rates of NPP Earth system models project divergent long-term shifts in the decadal ...
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Jitka Polechová @polejit.bsky.social · 08/05/2026
New #ecoevo paper @pnas.org: Evolution of species’ range and niche in changing environments. I show that feedback between evolutionary and population dynamics can create a tipping point where genetic variance erodes, and species’ ranges contract or fragment www.pnas.org/doi/10.1073/... #popgen 🧬🧪 🌎
Drawing shows a group of chimeric species at the center, from which three spirals of diversity loss lead to a single form: a bird, a fish, or a fox. Image credit: Tereza Nekovarova.
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Cameron Thrash @jcamthrash.bsky.social · 07/05/2026
A redox-sensitive phosphatase regulates glycolysis as a metabolic switch in the bacterial inner membrane www.science.org/doi/full/10.... #jcampubs
science.org
A redox-sensitive phosphatase regulates glycolysis as a metabolic switch in the bacterial inner membrane
Redox-sensitive phosphatase PgpA couples glycolysis and redox balance to control metabolic adaptation in E. coli.
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Cameron Thrash @jcamthrash.bsky.social · 07/05/2026
The heterogeneous selection landscape of genome evolution in prokaryotes www.pnas.org/doi/10.1073/... #jcampubs
pnas.org
The heterogeneous selection landscape of genome evolution in prokaryotes | PNAS
Evolution of prokaryote genomes appears to be defined by the interplay of selection for genome streamlining, deletion bias, and selection for funct...
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Nature Computational Science @natcomputsci.nature.com · 30/04/2026
📢Out now: Na Jiao and colleagues present DeepSeMS, a framework for predicting secondary metabolite structures from biosynthetic gene cluster sequences. www.nature.com/articles/s43... #microbiome 🧫 🔓 rdcu.be/fgic0
nature.com
DeepSeMS: revealing the hidden biosynthetic potential of the global ocean microbiome with a large language model - Nature Computational Science
This work presents DeepSeMS, a transformer-based framework that translates biosynthetic gene clusters into candidate secondary metabolite structures, enabling scalable exploration of chemical diversit...
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Cameron Thrash @jcamthrash.bsky.social · 23/04/2026
Our first collaboration with the Levine lab! Defining metabolic niches for marine microbial heterotrophs www.science.org/doi/full/10.... #jcampubs 🌊
science.org
Defining metabolic niches for marine microbial heterotrophs
Understanding carbon cycling requires simplifying bacterial diversity into functional groups defined by genetic signatures.
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Cameron Thrash @jcamthrash.bsky.social · 12/04/2026
Polyphosphate acts as an architectural regulator of carbon fixation and nucleoid structure in cyanobacteria www.biorxiv.org/content/10.6... #jcampubs
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Nature Chemical Biology @natchembio.nature.com · 07/04/2026
The maturation of the unique FeMo-cofactor of molybdenum nitrogenase is a multistep process requiring the sequential action of a series of maturase complexes. Cryo-EM structures capture trafficking of a key intermediate of cofactor assembly www.nature.com/articles/s41...
nature.com
Trafficking of a nitrogenase FeMo-cofactor assembly intermediate - Nature Chemical Biology
The maturation of the unique FeMo-cofactor of molybdenum nitrogenase is a multistep process requiring the sequential action of a series of maturase complexes. Here, the authors report on how cryo-elec...
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Jed Fuhrman @jedfuhrman.bsky.social · 01/04/2026
Want to convert old relative abundance ocean amplicon data into absolute abundances? Williams et al. show a flow cytometry "anchor" can provide reasonable absolute abundances, validated by internal-standard corrected metagenomics with single copy genes, and amplicons academic.oup.com/ismecommun/a...
academic.oup.com
Converting Relative Amplicon Abundances to Absolute Abundances via Flow Cytometry: Metagenomic Validation and Application to Long Ocean Transects
Abstract. With microbes critical for ocean ecological and biogeochemical processes, we need to understand their abundance and diversity distributions. Whil
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Proceedings of the National Academy of Sciences @pnas.org · 31/03/2026
One of the most-viewed PNAS articles in the last week is “Characterization of phytoplankton-excreted metabolites mediating carbon flux through the surface ocean.” Explore the article here: ow.ly/zPNG50YBfRR For more trending articles, visit ow.ly/iZnr50YBfRS.
January and July maps of estimated proline, glutamic acid, ectoine, and DHPS excretion in the top 100 m seawater of the global ocean. Labels indicate producers for which the metabolite is among the top 10 exometabolites. Surveyed phytoplankton and their functional group are indicated by color.
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Cameron Thrash @jcamthrash.bsky.social · 31/03/2026
Biochemical remodelling of phytoplankton cell composition under climate change www.nature.com/articles/s41... #jcampubs 🌊
nature.com
Biochemical remodelling of phytoplankton cell composition under climate change - Nature Climate Change
The authors simulate phytoplankton macromolecular composition—proteins, carbohydrates and lipids—under present and future scenarios. They show increased protein allocation in subtropical phytoplankton...
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Cameron Thrash @jcamthrash.bsky.social · 27/03/2026
Alkaline phosphatase activity supports heterotrophic carbon acquisition in a coastal time series site and a representative marine bacterium www.biorxiv.org/content/10.6... #jcampubs 🌊
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Emanuele Bevacqua @bevacquae.bsky.social · 25/03/2026
In a new Nature study, we show that extreme global climate outcomes may occur even under moderate 2°C warming for several sectors. The findings reinforce the urgency of limiting warming well below 2°C. Together with @erichfischer.bsky.social @janasillmann.bsky.social @zscheischlerjak.bsky.social
nature.com
Moderate global warming does not rule out extreme global climate outcomes - Nature
Extreme global climate outcomes may occur even under moderate 2 °C warming and may turn out to be more extreme than model-averaged projections at 3 °C or 4 °C warming.
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Richard McElreath 🐈‍⬛ @rmcelreath.bsky.social · 22/03/2026
Statistical Rethinking 2026 is done: 20 new lectures emphasizing logical and critical statistical workflow, from basics of probability theory to causal inference to reliable computation to sensitivity. It's all free, made just for you. Lecture list and links: github.com/rmcelreath/s...
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James Briscoe @jamesbriscoe.bsky.social · 09/03/2026
New Perspective form Rory Maizels & me: "Gene regulatory networks: from correlative models to causal explanations" Gene regulatory networks are supposed to give us mechanistic explanations of development, so why are we drowning in 'hairballs' of statistical correlations? rdcu.be/e7zx7
rdcu.be
Gene regulatory networks: from correlative models to causal explanations
Nature Reviews Genetics - In this Perspective, Maizels and Briscoe discuss the limitations of current models of gene regulatory networks and outline solutions to harness data abundance without...
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Proceedings of the National Academy of Sciences @pnas.org · 19/03/2026
Trace elements incorporated into grains of pyrite preserve information about the chemistry of ancient oceans, allowing researchers to reconstruct the interplay of biology and tectonics driving long-term oxygen fluctuations. In PNAS: ow.ly/RJSO50YwsLC
Artist’s illustration of a pristine pyrite grain as an archive of Earth's 3.5-billion-year transition to an oxygenated atmosphere, showing machine learning “threads” extracting redox patterns from the mineral’s lattice and the reconstructed pulses of atmospheric oxygen. 
CREDIT: Zhen-Jie Zhang.
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Nature Ecology & Evolution @natecoevo.nature.com · 18/03/2026
Experimental evolution of fission yeast in the same environment as a previous experiment with budding yeast reveals parallel evolution but distinct molecular mechanisms and targets of adaptation in the two species 🧪 www.nature.com/articles/s41...
nature.com
Parallel but distinct adaptive routes in the budding and fission yeasts after 10,000 generations of experimental evolution - Nature Ecology & Evolution
Experimental evolution of fission yeast (Schizosaccharomyces pombe) in the same environment as a previous experiment with budding yeast (Saccharomyces cerevisiae) reveals parallel evolution but distin...
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Martin Steinegger 🇺🇦 @martinsteinegger.bsky.social · 17/03/2026
AlphaFold database has entered the era of complexes. Together with NVIDIA, DeepMind and EBI, we use ColabFold, OpenFold and MMseqs2-GPU to predict ~31 million complexes (homo & hetro-dimers) resulting in 1.8 million high-quality predictions 📄 research.nvidia.com/labs/dbr/ass... 🌐 alphafold.ebi.ac.uk
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Marco Mauri @marcomauri.bsky.social · 16/03/2026
🚨 Next Friday 20/03 15:30 EU, Julia Schwartzman (University of Southern California) will present the talk Ecological Dynamics of Bacterial Groups at the Population Dynamics Seminars. Subscription sites.google.com/view/popdyn/
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Trevor A. Branch @trevorabranch.bsky.social · 10/03/2026
This could be your dream job! PhD in ecology, and English and Japanese language skills required... working for POKEMON!!! www.ign.com/articles/the...
ign.com
The Pokémon Company Is Actively Recruiting PhD Holders With Backgrounds in Ecology to Work in Tokyo - IGN
The Pokémon Company is actively recruiting PhD holders with backgrounds in ecology to work in Tokyo. This is perhaps the closest chance Pokémon fans have to channel their inner Professor Oak in real l...
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Nature Portfolio @natureportfolio.nature.com · 08/03/2026
International Women’s Day celebrates the Earth’s 4 billion female inhabitants. Nature brings you a collection of the latest on advancements in women’s health and career guidance, advice and inspiration for women in science. 🧪 #IWD2026
go.nature.com
International Women's Day 2026
Nature highlights developments in women’s health research and career guidance for women in science.
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Nature Portfolio @natureportfolio.nature.com · 07/03/2026
A study published in Nature Ecology & Evolution reports that long-term ocean warming reduces global fish biomass by up to 19.8% annually. Warmer years and marine heatwaves were linked to sharp biomass losses of up to 43.4%. go.nature.com/40b6AIB 🧪 🌍
The image shows two figures, a and b. Figure a shows a map of Europe with thermal positions indicated by color-coded hexagons, ranging from -1.0 to 1.0. Arrows point to "Reduced negative impacts" and "Increased negative impacts." Figure b shows a scatter plot of effect size vs thermal position with a fish illustration on top. "Biomass change estimates" indicated by circle size.
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Lars Eicholt @lacholt.bsky.social · 28/01/2026
Check out our new review in Nature Reviews Genetics on de novo emerged genes and proteins. How they emerge, are lost and persist - and how de novo emerged proteins relate to randomized proteins! @bornberglab.bsky.social www.nature.com/articles/s41...
nature.com
Emergence and evolution of protein-coding de novo genes - Nature Reviews Genetics
De novo gene evolution entails the birth of new genes from previously non-coding DNA. In this Review, Bornberg-Bauer and Eicholt overview how protein-coding de novo genes are identified, the mechanist...
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Cameron Thrash @jcamthrash.bsky.social · 04/03/2026
Ocean warming enhances iron use efficiencies of marine ammonia-oxidizing archaea #USC_MEB www.pnas.org/doi/abs/10.1... #jcampubs
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Cameron Thrash @jcamthrash.bsky.social · 02/03/2026
DECODE: deep learning-based common deconvolution framework for various omics data www.nature.com/articles/s41... #jcampubs
nature.com
DECODE: deep learning-based common deconvolution framework for various omics data - Nature Methods
DECODE is a universal deconvolution framework for both cell types and cell states that can be applied to transcriptomic, proteomic and metabolomic data.
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Nature @nature.com · 27/02/2026
Happy 30th birthday, Pokémon! Since 1996, the Japanese media sensation has inspired generations of researchers in fields as diverse as evolution, biodiversity and research integrity. go.nature.com/4bcjZ9w
go.nature.com
Pokémon turns 30 — how the fictional pocket monsters shaped science
The Japanese media sensation has inspired generations of researchers in fields as diverse as evolution, biodiversity and research integrity.
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Zack Labe @zacklabe.com · 21/02/2026
We have a new study out! In this work, we examine how the Gulf Stream and Kuroshio-Oyashio Extension co-vary, and this is tied to atmospheric variability and potentially sea-ice anomalies. However, this linkage may be changing in a warming world... ➡️ #OpenAccess: www.science.org/doi/10.1126/...
science.org
Evolving synchronization of the Gulf Stream and Kuroshio-Oyashio Extension in a changing climate
Summer SST covariability across the North Pacific and North Atlantic may be linked to Arctic sea-ice loss and climate change.
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Dr. Carly Kenkel @drcarl.bsky.social · 24/02/2026
Calling all researchers working on *Genomics of Adaptation to Extreme Thermal Environments* I'm serving as a guest editor of an upcoming collection in BMC Genomics and am eager to read your submission! More on scope and how to contribute here: bit.ly/4kH3PIx 🧪 @springer.springernature.com
bit.ly
Genomics of adaptation to extreme thermal environments
As climate change continues to influence ecosystems around the globe, understanding the genomics of adaptation to hot and cold environments is becoming ...
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Cameron Thrash @jcamthrash.bsky.social · 18/02/2026
Decoupled timescales of organic carbon and phosphorus recycling in the global ocean www.pnas.org/doi/abs/10.1... #jcampubs 🌊
pnas.org
Decoupled timescales of organic carbon and phosphorus recycling in the global ocean | PNAS
The ocean’s biological carbon pump exports atmospheric CO2 to the deep ocean, where it can remain sequestered for decades to centuries, and attempt...
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Brett Baker @archaeal.bsky.social · 18/02/2026
New paper from my team detailing a greatly expanded genomic database of Asgard archaea revealing of high energy metabolism those related to eukaryotes! Led by @katyappler.bsky.social lots of help from @jameslingford.bsky.social @valdeanda.bsky.social @kassipan.bsky.social doi.org/10.1038/s415...
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Edoardo Gianni @edogia.bsky.social · 13/02/2026
How could a simple self-replicating system emerge at the origins of life? RNA polymerase ribozymes can replicate RNA, but existing ones are so large that their self-replication seems impossible. Could they be smaller? Excited to share our latest work in @science.org on a new small polymerase. 1/n
science.org
A small polymerase ribozyme that can synthesize itself and its complementary strand
The emergence of a chemical system capable of self-replication and evolution is a critical event in the origin of life. RNA polymerase ribozymes can replicate RNA, but their large size and structural ...
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PriME - Principles of Microbial Ecosystems @primecollaboration.bsky.social · 12/02/2026
🔥Hot off the press! ❓ How do bacteria get iron when nutrients are scarce and constantly washed away❓ A PriME collective effort reveals—using a new continuous culture device—how bacteria acquire iron under rapid nutrient renewal, beyond #siderophores. www.pnas.org/doi/10.1073/...
pnas.org
Bacterial iron acquisition by Escherichia coli is facilitated by amino acid complexation in a rapid-renewal environment | PNAS
In natural environments, bacteria often encounter low concentrations of nutrient mixtures that are continuously replenished by physical processes s...
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Nature Structural & Molecular Biology @natsmb.nature.com · 11/02/2026
ICYMI: New online: Mechanism and reconstitution of circadian transcription in cyanobacteria
dlvr.it
Mechanism and reconstitution of circadian transcription in cyanobacteria
Nature Structural & Molecular Biology, Published online: 10 February 2026; doi:10.1038/s41594-025-01740-0Fang et al. reveal how a bacterial circadian clock turns genes on and off at the right times of day and use the purified proteins to drive circadian gene transcription in a test tube for days.
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Nature Communications @natcomms.nature.com · 06/02/2026
Here, the authors compile transcriptomic data from experimental evolution of a prokaryotic and five eukaryotic species in 22 environments to reveal that gene expression evolution is often repeatable and deterministic. www.nature.com/articles/s41...
nature.com
Repeatability of gene expression evolution in experimental environmental adaptation - Nature Communications
Experimental evolution enables evaluation of the relative roles of chance and necessity in evolution. This study compiles transcriptomic data from experimental evolution of a prokaryotic and five euka...
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Cameron Thrash @jcamthrash.bsky.social · 03/02/2026
Nutrient availability modulates impacts of short‐term shifts in temperature and grazing on phytoplankton composition and size structure aslopubs.onlinelibrary.wiley.com/doi/10.1002/... #jcampubs 🌊
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Cameron Thrash @jcamthrash.bsky.social · 03/02/2026
Proteomic and biogeochemical perspectives on cyanobacteria nutrient acquisition – Part 2: quantitative contributions of cyanobacterial alkaline phosphatases to bulk enzymatic rates in the subtropical North Atlantic bg.copernicus.org/articles/23/... #jcampubs 🌊
bg.copernicus.org
Proteomic and biogeochemical perspectives on cyanobacteria nutrient acquisition – Part 2: quantitative contributions of cyanobacterial alkaline phosphatases to bulk enzymatic rates in the subtropical ...
Abstract. Microbial enzymes alter marine biogeochemical cycles by catalyzing chemical transformations that bring elements into and out of particulate organic pools. These processes are often studied t...
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Cameron Thrash @jcamthrash.bsky.social · 03/02/2026
Proteomic and biogeochemical perspectives on cyanobacteria nutrient acquisition – Part 1: Zonal gradients in phosphorus and nitrogen acquisition and stress revealed by metaproteomes of Prochlorococcus and Synechococcus bg.copernicus.org/articles/23/... #jcampubs 🌊
bg.copernicus.org
Proteomic and biogeochemical perspectives on cyanobacteria nutrient acquisition – Part 1: Zonal gradients in phosphorus and nitrogen acquisition and stress revealed by metaproteomes of Prochlorococcus...
Abstract. Ocean productivity is maintained by key nutrients, including nitrogen, phosphorus and trace metals. The magnitude and stoichiometry of nutrient fluxes to the ocean is changing. Here, we inve...
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Cameron Thrash @jcamthrash.bsky.social · 02/02/2026
Photoholes within cyanobacterial mats can account for the origin of anammox bacteria and ancient nitrogen loss www.nature.com/articles/s41... #jcampubs
nature.com
Photoholes within cyanobacterial mats can account for the origin of anammox bacteria and ancient nitrogen loss - Nature Ecology & Evolution
The authors leverage experimental and phylogenetic data to propose that anammox bacteria during the Archaean period could have harvested photoholes from cyanobacterial mats for use as an electron acce...
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Kaçar Lab at UW-Madison @kacarlab.bsky.social · 30/01/2026
Our new paper, out today! We resurrected ancient nitrogenases first used by life on Earth 3 billion years ago. We combined synthetic biology and geology & validated their chemical #biosignature in rocks that helps reveal ancient life on Earth!(and beyond!) Link: www.nature.com/articles/s41...
nature.com
Resurrected nitrogenases recapitulate canonical N-isotope biosignatures over two billion years - Nature Communications
The study shows that nitrogenase enzymes have maintained stable isotope signatures over billions of years, revealing how ancient microbes shaped Earth’s nitrogen cycle and offering a new experimental ...
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