Results 71 to 80 of about 569 (166)

δ Deuterium leaf wax isotopes from sediment core of Lake Alchichica in Mexico

The isotope analyses were performed on subsamples from a 57-cm-long sediment core retrieved from Lake Alchichica (19° 24' 38 N, 97° 24' 14 W, 2322 masl) at a water depth of ~ 60 m using a Uwitec® coring device equipped with a 9-cm coring tube.
Rantala, Marttiina V, Schefuß, Enno, Fagel, Nathalie, Francus, Pierre, Tylmann, Wojciech, Metcalfe, Sarah, Israde-Alcántara, Isabel, Mattielli, Nadine, Domínguez-Vázquez, Gabriela, Safaierad, Reza   +9 more
core   +1 more source

On Limnocytherina axalapasco, a new freshwater ostracod (Podocopida: Limnocytheridae) from Mexican crater lakes

Revista de Biología Tropical, 2014
Limnocytherina is a genus conformed by 12 species; its distribution in the American continent is known to be exclusively on the North (neartics), but little is reported about its distribution from Mexico (transition zone) and Central America (Neotropics).
Sergio Cohuo-Durán, Liseth Pérez, Ivana Karanovic   +2 more
doaj  

Studies on the Aqueous Synthesis of Chalcones

Reactions
In this study, an alternative methodology for the aqueous synthesis of chalcones is presented. This procedure is performed on a green basis at room temperature (25–40 °C) and using KOH. From this method, thirty-seven derivatives were obtained with yields
Quirino Torres Sauret, Daisy Gabriela Murillo Yanes, Luis Fernando Roa de la Fuente, Roberto Martínez, Jorge R. Juárez Posadas, Manuel Velasco Ximello, Erika M. Ramos Rivera, Oswaldo Hernández Abreu, Rosalía Torralba Sánchez, Roxana Martínez-Pascual, Omar Santiago Sosa, Cuauhtémoc Alvarado Sánchez   +11 more
doaj   +1 more source

X-ray Fluorescence (XRF) core scanning from sediment core of Lake Alchichica in Mexico

The geochemical data were measured from a 57-cm-long sediment core retrieved from Lake Alchichica (19° 24' 38 N, 97° 24' 14 W, 2322 masl) at a water depth of ~ 60 m using a Uwitec® coring device equipped with a 9-cm coring tube.
Rantala, Marttiina V, Schefuß, Enno, Fagel, Nathalie, Francus, Pierre, Tylmann, Wojciech, Metcalfe, Sarah, Israde-Alcántara, Isabel, Mattielli, Nadine, Domínguez-Vázquez, Gabriela, Safaierad, Reza   +9 more
core   +1 more source

Últimas Pescadoras de Charal en el Lago Alchichica, Puebla, México

Ciencia Pesquera
El presente artículo se centra en las investigaciones realizadas sobre las últimas pescadoras artesanales de charal que aún subsisten en el lago cráter de Alchichica, mismas que son singulares por su particular estilo de pesca y su tradición antigua. Ellas se enfrentan a grandes desafíos en torno a la problemática que sufre el lago de Alchichica y su ...
Juan Ricardo Cruz Aviña, Daniela Ramos Contreras, Osvaldo Eric Ramírez Bravo, Miguel Ángel Arias Ortega, Benjamín Ortiz Espejel   +4 more
openaire   +1 more source

Seasonal and spatial dynamics of a ciliate assemblage in a warm-monomictic Lake Alchichica (Puebla, Mexico) [PDF]

, 2017
The distribution of the ciliate assemblage was surveyed along a depth gradient in the maar crater, athalassohaline, warm monomictic Lake Alchichica (Puebla, Mexico) from June 2003 to October 2006 (monthly).
Macek, Miroslav, Petová, Dana, Martínez Pérez, María Elena   +2 more
core   +1 more source

TEMPORAL VARIATION IN THE ABUNDANCE OF POBLANA ALCHICHICA IN NEAR-SHORE HABITAT OF THE HIGH ELEVATION LAKE, LAGO DE ALCHICHICA, PUEBLA, MEXICO

, 2012
"The distribution and abundance of organisms within a pond or lake can reflect the result of a variety of factors. We examined the abundance of the endemic fish, Poblana Alchichica, in Lago de Alchichica, Puebla, Mexico, as well as how the abundance varied among months. Dissolved oxygen, temperature, and salinity varied among months.
GUILLERMO A. WOOLRICH-PIÑA, GEOFFREY R. SMITH, JULIO A. LEMOS-ESPINAL, RAYMUNDO MONTOYA-AYALA, LUIS E. ÁVILA-BOCANEGRA, EDUARDO BENAVIDES GARDUÑO   +5 more
openaire   +2 more sources

δ18O and δ13C from sediment core of Lake Alchichica in Mexico

The proxy data are measured from a 57-cm long sediment core collected from Lake Alchichica (19° 24' 38 N, 97° 24' 14 W, 2322 masl) at a water depth of ~ 60 m using a Uwitec® coring device equipped with a 9-cm coring tube.
Rantala, Marttiina V, Schefuß, Enno, Fagel, Nathalie, Francus, Pierre, Tylmann, Wojciech, Metcalfe, Sarah, Israde-Alcántara, Isabel, Mattielli, Nadine, Domínguez-Vázquez, Gabriela, Safaierad, Reza   +9 more
core   +1 more source

Iodine promoted one-pot synthesis of flavones

Results in Chemistry
A novel one-pot methodology for the synthesis of flavones starting from simple precursors such as 2′-hydroxyacetophenone and benzaldehyde derivatives in pentan-1-ol (a green solvent), without additives, mediated by iodine and with short reaction times (1 
Darvin Jesús Torres Ribón, Luis Fernando Roa de la Fuente, Nancy Romero Ceronio, Oswaldo Hernández Abreu, Madeleyne Ramos Rivera, Jorge R. Juárez, Rosalía Torralba, Manuel Velasco Ximello, Quirino Torres Sauret, Cuauhtémoc Alvarado Sánchez   +9 more
doaj   +1 more source

Ostrácodos no-marinos de lagos en el altiplano este-centro de México

Revista de Biología Tropical, 2015
La fauna de ostrácodos de la zona de transición néartica-neotropical ha sido poco estudiada hasta este estudio. En el este-centro de México, habitan diez especies de ostrácodos en diez lagos: cinco lagos maar (originados por explosiones freáticas/freato ...
Liseth Pérez, Socorro Lozano-García, Margarita Caballero   +2 more
doaj