Results 51 to 60 of about 3,434 (170)

The ComEA/ComEC Operon is Critical for Nitrosative Stress Tolerance by an Oral Commensal

Molecular Oral Microbiology, EarlyView.
ABSTRACT Oral commensal streptococci play a large role in mediating microbial homeostasis. Our prior work has demonstrated that hydrogen peroxide (H2O2) produced by oral commensal streptococci can react with salivary nitrite (NO2) and generate peroxynitrite (ONOO−), a potent antimicrobial.
Sara E. Edmonds, Hernan Grenett, Priscilla Grenett, Jessica A. Scoffield   +3 more
wiley   +1 more source

Using light scatter signal to estimate bacterial biovolume by flow cytometry [PDF]

Cytometry, 2001
In the past decade, flow cytometry has become a useful and precise alternative to microscopic bacterial cell counts in aquatic samples. However, little evidence of its usefulness for the evaluation of bacterial biovolumes has emerged in from the literature.The light scattering and cell volume of starved bacterial strains and natural bacterial ...
Bouvier, Thierry, Troussellier, Marc, Anzil, Adriana, Courties, Claude, Servais, Pierre   +4 more
openaire   +3 more sources

Wildfire in the Surrounding Landscape Alters Limnological Conditions and Plankton Communities in a Tropical Reservoir

International Review of Hydrobiology, Volume 111, Issue 2, December 2026.
ABSTRACT Wildfires are becoming increasingly frequent and severe as a consequence of climate change. Their impacts on terrestrial ecosystems and on the atmosphere include the release of gases and ash, as well as enhanced soil susceptibility to erosion and the downstream transport of materials into aquatic systems.
Daniel Guido Giongo, Edna Viviana Calpa‐Anaguano, Larissa Broggio Raymundo, Eloisa Hummer, Israel Cassiano‐Oliveira, Karime de Araujo‐Paina, Gilmar Perbiche‐Neves, Hugo Sarmento   +7 more
wiley   +1 more source

Taxon‐specific community structure partitions marine particle size spectra into stable and dynamic components

Limnology and Oceanography Letters, Volume 11, Issue 6, November 2026.
Abstract Oceanic particle size distributions (PSDs) link plankton community structure to biogeochemical cycling. Although the influence of community composition on size spectra is well recognized in theoretical approaches, long‐term empirical evidence connecting taxon‐specific variability to bulk PSD structure remains limited.
Fernanda Henderikx‐Freitas, Andrew J. Hirzel, Angelicque E. White   +2 more
wiley   +1 more source

Biovolume de cianobactérias e algas de reservatórios tropicais do Brasil com diferentes estados tróficos

Hoehnea
O presente estudo visou apresentar o biovolume de cianobactérias e algas fitoplanctônicas e perifíticas de reservatórios com diferentes estados tróficos do Parque Estadual das Fontes do Ipiranga, São Paulo, SP, Brasil.
Bárbara Medeiros Fonseca, Carla Ferragut, Andréa Tucci, Luciane Oliveira Crossetti, Fernanda Ferrari, Denise de Campos Bicudo, Célia Leite Sant'Anna, Carlos Eduardo de Mattos Bicudo   +7 more
doaj   +1 more source

Experimental Assessment of Epipelon Responses to Phosphorus Limitation in a Eutrophic Lake

Ecological Research, Volume 41, Issue 6, November 2026.
We evaluated the responses of epipelic algal and cyanobacterial communities to increasing phosphorus limitation in the water column under eutrophic conditions. Nitrogen enrichment increased the N:P ratio and intensified phosphorus limitation in the water column, promoting changes in community composition. The greater contribution of cyanobacteria (e.g.,
Renata Aparecida Costa, Darah Danielle Pontes, Carla Ferragut   +2 more
wiley   +1 more source

Estrutura de populações de fitoflagelados nas lagoas de inundação do rio Araguaia, Brasil Structure of phytoflagellate populations in floodplain lakes of the Araguaia River, Brazil

Acta Botânica Brasílica, 2009
O objetivo deste trabalho foi avaliar a estrutura e dinâmica das populações de fitoflagelados nos períodos de chuva e estiagem dos anos de 2000 e 2001 nas lagoas de inundação do rio Araguaia.
João Carlos Nabout, Ina de Souza Nogueira, Leandro Gonçalves Oliveira   +2 more
doaj   +1 more source

Measurements of the Size and Physical Properties of Marine Particles Using Atomic Force Microscopy: Implications for Marine Biogeochemical Cycles

Geophysical Research Letters, Volume 53, Issue 19, 16 October 2026.
Abstract Particle size and physical properties such as stiffness and adhesiveness affect sinking velocity and flux in the ocean, yet conventional two‐dimensional measurements lack accuracy and mechanical information. In this study, we applied atomic force microscopy (AFM) to quantify three‐dimensional size and physical properties of marine particles ...
Y. Yamada, T. Mochizuki, H. Fukuda, T. Nagata, S. Mitarai   +4 more
wiley   +1 more source

Fitoplancton de una laguna pampásica (San Miguel del Monte, Buenos Aires, Argentina)

Biología Acuática, 2019
Phytoplankton assemblages were analyzed taking into account the functional groups in a shallow lake connected to the lower basin of Salado River. Samples were obtained monthly (9/1997-8/1998), from the affluent (E1), San Miguel del Monte lake (E2) and ...
Karina Paola Quaíni, Lía C. Solari, G. Ruiz   +2 more
doaj  

QPI assay of fibroblasts resilience to adverse effects of nanoGO clusters by multimodal and multiscale microscopy

JPhys Photonics
Graphene is considered a possible drug deliver in nanomedicine for its mechanical, physical and chemical characteristics. Thus, studying graphene biocompatibility is pivotal to contribute to the modern nano-therapy science.
Marika Valentino, Daniele Pirone, Jaromir Béhal, Martina Mugnano, Rachele Castaldo, Giuseppe C Lama, Pasquale Memmolo, Lisa Miccio, Vittorio Bianco, Simonetta Grilli, Pietro Ferraro   +10 more
doaj   +1 more source