Results 21 to 30 of about 477 (162)

Alkaline saline lakes: A chemical evolution experiment evaluating the stability of formaldehyde in an aqueous saline environment [PDF]

Heliyon
Formaldehyde condensation in the presence of a mineral catalyst and under alkaline conditions is considered to be a ''messy'' chemical system due to its dependence on the complex chemical equilibrium between the reaction intermediates, which has a ...
Claudio Alejandro Fuentes-Carreón, Adriana Leticia Meléndez-López, Jorge Armando Cruz-Castañeda, Alicia Negrón-Mendoza   +3 more
doaj   +2 more sources

Deposition, burial and sequestration of carbon in an oligotrophic, tropical lake

Journal of Limnology, 2014
The amount of biogenic carbon that may be deposited, buried and eventually preserved (sequestered) in the sediments of a tropical, oligotrophic lake, was evaluated based on i) the temporal variation of the particulate organic carbon (POC) concentration ...
Javier Alcocer, Ana C. Ruiz-Fernández, Elva Escobar, Libia H. Pérez-Bernal, Luis A. Oseguera, Vilma Ardiles-Gloria   +5 more
doaj   +3 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   +2 more sources

Diagenetic formation of stevensite by replacement of diatom frustules in the sediments of the alkaline Lake Alchichica (Mexico)

Sedimentology, 2023
International audienceBetter understanding the conditions of formation of authigenic Mg-silicates and their reactivity is key to interpret the palaeoenvironmental message carried by the sedimentary record and evaluate the effect of reverse weathering, a ...
Didier Jézéquel, López‐garcía, Purificación, Moreira, David, Purificación López‐García, Karim Benzerara, Elodie Muller, Benzerara, Karim, Tavera, Rozaluz, López-García, Purificación, Robin Havas, Jézéquel, Didier, David Moreira, Thomazo, Christophe, Rapin, William, de Wever, Alexis, Havas, Robin, Muller, Elodie, Rozaluz Tavera, Christophe Thomazo, William Rapin, Caumartin, Jeanne, Jeanne Caumartin, Alexis De Wever   +22 more
core   +5 more sources

Fabaeformiscandona alchichica Meisch & Smith & Martens 2019, comb. nov.

, 2019
(1) Fabaeformiscandona alchichica (Cohuo et al., 2017) comb. nov. Candona alchichica Cohuo et al., 2017 was assigned to the acuminata group of Candona by Cohuo et al.
Martens, Koen, Meisch, Claude, Smith, Robin J.   +2 more
core   +3 more sources

Reappraising the eruptive history of the Alchichica Maar Volcano (Mexico) based on Sr–Nd isotopes: Understanding the role of the magma source region on the growth of small-volume volcanoes

Solid Earth Sciences
Alchichica Maar is in the eastern sector of the Trans-Mexican Volcanic Belt, where volcanics range from basalts to rhyolites, with 87Sr/86Sr and 143Nd/144Nd values between 0.70293 to 0.70447 (εSr = −21.1 to −4.5) and 0.512733 to 0.512949 (εNd = +3.4 to ...
Boris Chako-Tchamabe, Bodo Weber, Merlin Gountie Dedzo   +2 more
exaly   +3 more sources

Genetic diversity associated with N-cycle pathways in microbialites from Lake Alchichica, Mexico [PDF]

Aquatic Microbial Ecology, 2017
Microbialites are an example of complex and diverse microbial assemblages where several metabolic pathways are interconnected for biomass formation coupled to mineral precipitation.
Centeno, CM, RJ Alcántara-Hernández, PM Valdespino-Castillo, J Alcocer, M Merino-Ibarra, Alcántara-Hernández, RJ, Falcón, LI, CM Centeno, LI Falcón, Valdespino-Castillo, PM, Merino-Ibarra, M, Alcocer, J   +11 more
core   +5 more sources

16S rDNA-based analysis reveals cosmopolitan occurrence but limited diversity of two cyanobacterial lineages with contrasted patterns of intracellular carbonate mineralization [PDF]

Frontiers in Microbiology, 2014
Cyanobacteria are mainly thought to induce carbonate precipitation extracellularly via their photosynthetic activity combined with the nucleation potential of exopolymeric substances. The discovery in microbialites of the alkaline lake Alchichica (Mexico)
Marie eRagon, Marie eRagon, Karim eBenzerara, David eMoreira, Rosaluz eTavera, Purificacion eLopez-Garcia   +5 more
doaj   +2 more sources

Hydrogeochemistry of salinas Zapotitlan and the crater-lakes Alchichica and Atexcac, Puebla [Hidrogeoqu�mica de salinas Zapotitl�n y los lagos-cr�ter alchichica y Atexcac, Puebla] [PDF]

Idesia (Arica), 2014
In this study we carried on the experimental evaporation of brines from two saline crater-lakes: Alchichica and Atexcac, in the Basin of the Oriental, Puebla, and from a saline spring, Salinas Chiquitas, Zapotitl n, Puebla, thus documenting patterns of ...
Ortega Mikolaev, Y.M., Guevara Gutierrez, R.D., Mancilla Villa, O.R., Ortega Escobar, H.M., Bautista Olivas, A.L., Sanchez Bernal, E.I., Can Chulim, A.   +6 more
core   +4 more sources

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   +2 more sources