@article {bordiga_unexpected_2023, title = {Unexpected silicon localization in calcium carbonate exoskeleton of cultured and fossil coccolithophores}, journal = {Scientific Reports}, volume = {13}, number = {1}, year = {2023}, note = {Number: 1 Publisher: Nature Publishing Group}, month = {may}, pages = {7417}, abstract = {Coccolithophores, marine calcifying phytoplankton, are important primary producers impacting the global carbon cycle at different timescales. Their biomineral structures, the calcite containing coccoliths, are among the most elaborate hard parts of any organism. Understanding the morphogenesis of coccoliths is not only relevant in the context of coccolithophore eco-physiology but will also inform biomineralization and crystal design research more generally. The recent discovery of a silicon (Si) requirement for crystal shaping in some coccolithophores has opened up a new avenue of biomineralization research. In order to develop a mechanistic understanding of the role of Si, the presence and localization of this chemical element in coccoliths needs to be known. Here, we document for the first time the uneven Si distribution in Helicosphaera carteri coccoliths through three synchrotron-based techniques employing X-ray Fluorescence and Infrared Spectromicroscopy. The enrichment of Si in specific areas of the coccoliths point to a targeted role of this element in the coccolith formation. Our findings mark a key step in biomineralization research because it opens the door for a detailed mechanistic understanding of the role Si plays in shaping coccolith crystals.}, keywords = {Biogeochemistry, Marine biology, Palaeontology, RCC1323}, issn = {2045-2322}, doi = {10.1038/s41598-023-34003-3}, url = {https://www.nature.com/articles/s41598-023-34003-3}, author = {Bordiga, M. and Lupi, C. and Langer, G. and Gianoncelli, A. and Birarda, G. and Pollastri, S. and Bonanni, V. and Bedolla, D. E. and Vaccari, L. and Gariani, G. and Cerino, F. and Cabrini, M. and Beran, A. and Zuccotti, M. and Fiorentino, G. and Zanoni, M. and Garagna, S. and Cobianchi, M. and Di Giulio, A.} } @booklet {Thomas2020, title = {USE OF AN AMPHIDINOL FOR ITS FUNGICIDAL AND/OR BACTERICIDAL ACTIVITY ON FUNGI, OOMYCETES AND/OR PATHOGENIC BACTERIA OF PLANTS AND CROP SEEDS}, number = {20200100499}, year = {2020}, note = {tex.mendeley-tags: RCC1436}, keywords = {? No DOI found, RCC1436}, url = {http://www.freepatentsonline.com/y2020/0100499.html}, author = {Thomas, Yann and Thiebeauld, Odon} } @article {Tisserand2020, title = {Use of organic exudates from two polar diatoms by bacterial isolates from the Arctic Ocean}, journal = {Philosophical transactions. Series A, Mathematical, physical, and engineering sciences}, volume = {378}, number = {2181}, year = {2020}, note = {Publisher: NLM (Medline) tex.mendeley-tags: RCC2278,RCC4289}, month = {oct}, pages = {20190356}, abstract = {Global warming affects primary producers in the Arctic, with potential consequences for the bacterial community composition through the consumption of microalgae-derived dissolved organic matter (DOM). To determine the degree of specificity in the use of an exudate by bacterial taxa, we used simple microalgae-bacteria model systems. We isolated 92 bacterial strains from the sea ice bottom and the water column in spring-summer in the Baffin Bay (Arctic Ocean). The isolates were grouped into 42 species belonging to Proteobacteria, Bacteroidetes, Actinobacteria and Firmicutes. Forty strains were tested for their capacity to grow on the exudate from two Arctic diatoms. Most of the strains tested (78\%) were able to grow on the exudate from the pelagic diatom Chaetoceros neogracilis, and 33\% were able to use the exudate from the sea ice diatom Fragilariopsis cylindrus. 17.5\% of the strains were not able to grow with any exudate, while 27.5\% of the strains were able to use both types of exudates. All strains belonging to Flavobacteriia (n = 10) were able to use the DOM provided by C. neogracilis, and this exudate sustained a growth capacity of up to 100 times higher than diluted Marine Broth medium, of two Pseudomonas sp. strains and one Sulfitobacter strain. The variable bioavailability of exudates to bacterial strains highlights the potential role of microalgae in shaping the bacterial community composition. This article is part of the theme issue {\textquoteright}The changing Arctic Ocean: consequences for biological communities, biogeochemical processes and ecosystem functioning{\textquoteright}.}, keywords = {Arctic Ocean, bacterial diversity, bacterial isolation, biodegradation, diatoms, dissolved organic exudates, RCC2278, RCC4289}, issn = {14712962}, doi = {10.1098/rsta.2019.0356}, url = {https://royalsocietypublishing.org/doi/10.1098/rsta.2019.0356}, author = {Tisserand, Lucas and Dadaglio, La{\"e}titia and Intertaglia, Laurent and Catala, Philippe and Panagiotopoulos, Christos and Obernosterer, Ingrid and Joux, Fabien} } @article {Breton2019, title = {Unveiling membrane thermoregulation strategies in marine picocyanobacteria}, journal = {New Phytologist}, number = {July}, year = {2019}, note = {ISBN: 0000000244022 tex.mendeley-tags: RCC2374,RCC2385,RCC515,RCC539}, month = {oct}, pages = {nph.16239}, keywords = {RCC2374, RCC2385, RCC515, rcc539}, issn = {0028-646X}, doi = {10.1111/nph.16239}, url = {https://onlinelibrary.wiley.com/doi/abs/10.1111/nph.16239}, author = {Breton, Sol{\`e}ne and Jouhet, Juliette and Guyet, Ulysse and Gros, Val{\'e}rie and Pittera, Justine and Demory, David and Partensky, Fr{\'e}d{\'e}ric and Dor{\'e}, Hugo and Ratin, Morgane and Mar{\'e}chal, {\'E}ric and Nguyen, Ngoc An and Garczarek, Laurence and Six, Christophe} } @article {VanTol2016, title = {Ubiquitous marine bacterium inhibits diatom cell division}, journal = {The ISME Journal}, volume = {11}, number = {1}, year = {2017}, note = {Publisher: Nature Publishing Group tex.mendeley-tags: 2016,RCC80}, month = {jan}, pages = {31{\textendash}42}, keywords = {2016, RCC80}, issn = {1751-7362}, doi = {10.1038/ismej.2016.112}, url = {http://dx.doi.org/10.1038/ismej.2016.112 http://www.nature.com/doifinder/10.1038/ismej.2016.112}, author = {van Tol, Helena M and Amin, Shady A and Armbrust, E Virginia} } @article {Paerl2016, title = {Use of plankton-derived vitamin B1 precursors, especially thiazole-related precursor, by key marine picoeukaryotic phytoplankton}, journal = {The ISME Journal}, volume = {11}, number = {3}, year = {2017}, note = {Publisher: Nature Publishing Group tex.mendeley-tags: rcc3401,rcc745}, month = {mar}, pages = {753{\textendash}765}, keywords = {rcc3401, RCC745}, issn = {1751-7362}, doi = {10.1038/ismej.2016.145}, url = {http://www.nature.com/doifinder/10.1038/ismej.2016.145}, author = {Paerl, Ryan W and Bouget, Fran{\c c}ois-Yves and Lozano, Jean-Claude and Verg{\'e}, Val{\'e}rie and Schatt, Philippe and Allen, Eric E and Palenik, Brian and Azam, Farooq} } @article {Clerissi2014, title = {Unveiling of the diversity of prasinoviruses (phycodnaviridae) in marine samples by using high-throughput sequencing analyses of PCR-Amplified DNA polymerase and major capsid protein genes}, journal = {Applied and Environmental Microbiology}, volume = {80}, number = {10}, year = {2014}, note = {tex.mendeley-tags: Micromonas,rcc}, pages = {3150{\textendash}3160}, abstract = {Viruses strongly influence the ecology and evolution of their eukaryotic hosts in the marine environment, but little is known about their diversity and distribution. Prasinoviruses infect an abundant and widespread class of phytoplankton, the Mamiellophyceae, and thereby exert a specific and important role in microbial ecosystems. However, molecular tools to specifically identify this viral genus in environmental samples are still lacking. We developed two primer sets, designed for use with polymerase chain reactions and 454 pyrosequencing technologies, to target two conserved genes, encoding the DNA polymerase (PolB gene) and the major capsid protein (MCP gene). While only one copy of the PolB gene is present in Prasinovirus genomes, there are at least seven paralogs for MCP, the copy we named number 6 being shared with other eukaryotic alga-infecting viruses. Primer sets for PolB and MCP6 were thus designed and tested on 6 samples from the Tara Oceans project. The results suggest that the MCP6 amplicons show greater richness but that PolB gave a wider coverage of Prasinovirus diversity. As a consequence, we recommend use of the PolB primer set, which will certainly reveal exciting new insights about the diversity and distribution of prasinoviruses at the community scale.}, keywords = {Micromonas, rcc, TARA-Oceans}, doi = {10.1128/aem.00123-14}, url = {http://aem.asm.org/content/80/10/3150.abstract}, author = {Clerissi, Camille and Grimsley, Nigel and Ogata, Hiroyuki and Hingamp, Pascal and Poulain, Julie and Desdevises, Yves} } @article {Thompson2012, title = {Unicellular cyanobacterium symbiotic with a single-celled eukaryotic alga}, journal = {Science}, volume = {337}, number = {6101}, year = {2012}, note = {tex.mendeley-tags: 2012,microb3,rcc,sbr?hyto$_\textrmd$ipo}, pages = {1546{\textendash}1550}, abstract = {Symbioses between nitrogen (N)2{\textendash}fixing prokaryotes and photosynthetic eukaryotes are important for nitrogen acquisition in N-limited environments. Recently, a widely distributed planktonic uncultured nitrogen-fixing cyanobacterium (UCYN-A) was found to have unprecedented genome reduction, including the lack of oxygen-evolving photosystem II and the tricarboxylic acid cycle, which suggested partnership in a symbiosis. We showed that UCYN-A has a symbiotic association with a unicellular prymnesiophyte, closely related to calcifying taxa present in the fossil record. The partnership is mutualistic, because the prymnesiophyte receives fixed N in exchange for transferring fixed carbon to UCYN-A. This unusual partnership between a cyanobacterium and a unicellular alga is a model for symbiosis and is analogous to plastid and organismal evolution, and if calcifying, may have important implications for past and present oceanic N2 fixation.}, keywords = {2012, MicroB3, rcc, SBR$_\textrmP$hyto$_\textrmD$PO, sbr?hyto$_\textrmd$ipo}, doi = {10.1126/science.1222700}, url = {http://www.sciencemag.org/content/337/6101/1546.abstract}, author = {Thompson, Anne W and Foster, Rachel A and Krupke, Andreas and Carter, Brandon J and Musat, Niculina and Vaulot, Daniel and Kuypers, Marcel M M and Zehr, Jonathan P} }