Results 1 to 10 of about 757 (174)

Metagenome-based diversity analyses suggest a significant contribution of non-cyanobacterial lineages to carbonate precipitation in modern microbialites [PDF]

Frontiers in Microbiology, 2015
Cyanobacteria are thought to play a key role in carbonate formation due to their metabolic activity, but other organisms carrying out oxygenic photosynthesis (photosynthetic eukaryotes) or other metabolisms (e.g.
Purificacion eLopez-Garcia
doaj   +9 more sources

Prokaryotic and Eukaryotic Community Structure in Field and Cultured Microbialites from the Alkaline Lake Alchichica (Mexico) [PDF]

PLoS ONE, 2011
The geomicrobiology of crater lake microbialites remains largely unknown despite their evolutionary interest due to their resemblance to some Archaean analogs in the dominance of in situ carbonate precipitation over accretion.
Estelle Couradeau, Karim Benzerara, David Moreira   +2 more
exaly   +3 more sources

Planktonic microbial communities from microbialite-bearing lakes sampled along a salinity-alkalinity gradient. [PDF]

Limnol Oceanogr, 2022
Abstract Continental freshwater systems are particularly vulnerable to environmental variation. Climate change‐induced desertification and the anthropogenic exploitation of hydric resources result in the progressive evaporation and salinization of inland water bodies in many areas of the globe.
Iniesto M, Moreira D, Benzerara K, Reboul G, Bertolino P, Tavera R, López-García P.   +6 more
europepmc   +2 more sources

Habitat expansion of a tropical chironomid by seasonal alternation in use of littoral and profundal zones [PDF]

Journal of Limnology, 2022
The consistent warming of tropical lakes at all depths causes rapid development and long persistence of seasonal hypoxia in the hypolimnion, which greatly reduces the biodiversity of hypolimnetic benthic invertebrates. Full mixing of the water column in
Javier Alcocer, William M. Lewis Jr., María del Carmen Hernández, Luis A. Oseguera, Vania J.J. Pérez, Narcís Prat   +5 more
doaj   +2 more sources

Micropearls and other intracellular inclusions of amorphous calcium carbonate: an unsuspected biomineralization capacity shared by diverse microorganisms. [PDF]

Environ Microbiol, 2022
Summary An unsuspected biomineralization process, which produces intracellular inclusions of amorphous calcium carbonate (ACC), was recently discovered in unicellular eukaryotes. These mineral inclusions, called micropearls, can be highly enriched with other alkaline‐earth metals (AEM) such as Sr and Ba.
Segovia-Campos I, Martignier A, Filella M, Jaquet JM, Ariztegui D.   +4 more
europepmc   +2 more sources

Inter-annual ciliate distribution variation within the late stratification oxycline in a monomictic lake, Lake Alchichica (Mexico) [PDF]

Journal of Limnology, 2016
noxia, and ciliates might play a very important role in the plankton community budget there. We analysed changes in the composition and biomass of the ciliate assemblage and other microbial loop components throughout the oxycline just at the end of ...
Ximena Sánchez Medina, Miroslav Macek, Fernando Bautista-Reyes, Andrea Perz, Patricia Bonilla Lemus, Mario Chávez Arteaga   +5 more
doaj   +5 more sources

Untangling the Primary Biotic and Abiotic Controls on Oxygen, Inorganic and Organic Carbon Isotope Signals in Modern Microbialites. [PDF]

Geobiology
ABSTRACT Microbialites are organo‐sedimentary structures formed throughout most of the Earth history, over a wide range of geological contexts, and under a multitude of environmental conditions affecting their composition. The carbon and oxygen isotope records of carbonates, which are most often their main constituents, have been used as a widespread ...
Havas R, Thomazo C, Caumartin J, Iniesto M, Bert H, Jézéquel D, Moreira D, Tavera R, Bettencourt V, López-García P, Vennin E, Benzerara K.   +11 more
europepmc   +2 more sources

Thermochemical Study of 1-Methylhydantoin [PDF]

Molecules, 2022
Using static bomb combustion calorimetry, the combustion energy of 1-methylhydantoin was obtained, from which the standard molar enthalpy of formation of the crystalline phase at T = 298.15 K of the compound studied was calculated.
Juan M. Ledo, Henoc Flores, Fernando Ramos, Elsa A. Camarillo   +3 more
doaj   +2 more sources

Piperidine-Iodine as Efficient Dual Catalyst for the One-Pot, Three-Component Synthesis of Coumarin-3-Carboxamides [PDF]

Molecules, 2022
A simple and efficient one-pot, three-component synthetic method for the preparation of coumarin-3-carboxamides was carried out by the reaction of salicylaldehyde, aliphatic primary/secondary amines, and diethylmalonate.
Manuel Velasco, Nancy Romero-Ceronio, Rosalía Torralba, Oswaldo Hernández Abreu, Miguel A. Vilchis-Reyes, Erika Alarcón-Matus, Erika M. Ramos-Rivera, David M. Aparicio, Jacqueline Jiménez, Eric Aguilar García, David Cruz Cruz, Clarisa Villegas Gómez, Cuauhtémoc Alvarado   +12 more
doaj   +2 more sources

Cyanobacterial calcification in modern microbialites at the submicrometer scale [PDF]

Biogeosciences, 2013
The search for microfossils in the geological record has been a long-term challenge. Part of the problem comes from the difficulty of identifying such microfossils unambiguously, since they can be morphologically confused with abiotic biomorphs.
E. Couradeau, K. Benzerara, E. Gérard, I. Estève, D. Moreira, R. Tavera, P. López-García   +6 more
doaj   +8 more sources