Results 121 to 130 of about 303 (146)

Validation of Electrochemiluminiscence Immunoassay for Ovarian Steroid Determination in Rhinella arenarum

Journal of Experimental Zoology Part A: Ecological Genetics and Physiology, 2016
ABSTRACTIn this work, we describe the validation of an electrochemiluminescence immunoassay (ECLIA) that allowed us for the first time to determine the levels of progesterone (P4) and testosterone (T) secreted by Rhinella arenarum follicles during the preovulatory (POP) and reproductive (RP) periods.
Arias Torres, Ana Josefina, Paez, Jose Bernardino, Zelarayán, Liliana Isabel   +2 more
openaire   +3 more sources

Mixture toxicity of copper and nonylphenol on the embryo-larval development of Rhinella arenarum

Environmental Science and Pollution Research, 2020
Copper and nonylphenol are two commonly found chemicals in the aquatic environment, particularly in the distribution area of the amphibian Rhinella arenarum. The current work evaluated the lethal toxicity of equitoxic and non-equitoxic binary mixtures of copper and nonylphenol on embryos and larvae of the South America toad by means of the standardized
Carolina Mariel Aronzon, Julieta Peluso, Cristina Pérez Coll   +2 more
openaire   +3 more sources

Control of spatial orientation in terrestrial toads (Rhinella arenarum).

Journal of Comparative Psychology, 2011
Three experiments were conducted to determine problem-solving strategies used by toads, Rhinella arenarum (= Bufo arenarum), in spatial learning situations, using water as reward. Experiment 1 showed that toads can acquire a spatial orientation based on a body-centered turn -an internal self-reference cue. Experiment 2 showed that toads can use a fixed
M Florencia, Daneri, Emma, Casanave, Rubén N, Muzio   +2 more
openaire   +2 more sources

Characterization of acute toxicity, genotoxicity, and oxidative stress of dimethoate in Rhinella arenarum larvae

Environmental Science and Pollution Research, 2021
There is a great concern worldwide about the global decline of amphibians, particularly by agrochemical pollution. The aim of this study was to assess oxidative stress and genotoxicity of a commercial formulation of the insecticide dimethoate in Rhinella arenarum larvae, using sublethal biomarkers.
Acquaroni, Maria de Las Mercedes, Peluso, Julieta, Svartz, Gabriela Veronica, Aronzon, Carolina Mariel, Perez Coll, Cristina Silvia   +4 more
openaire   +3 more sources

Acute, chronic and neurotoxic effects of dimethoate pesticide on Rhinella arenarum throughout the development

Journal of Environmental Science and Health, Part B, 2022
Among the factors implicated in amphibian global decline, agrochemicals have been gaining increasing attention. In order to evaluate the toxicity of a dimethoate-based insecticide on the early development of an autochthonous amphibian, Rhinella arenarum, continuous and 24 h pulse exposure bioassays were carried out.
Acquaroni, Maria de Las Mercedes, Svartz, Gabriela Veronica, Perez Coll, Cristina Silvia   +2 more
openaire   +3 more sources

Homeostasis and secretion of calcium in the oviductal mucosa of toad Rhinella arenarum

Journal of Experimental Zoology Part A: Ecological Genetics and Physiology, 2014
ABSTRACTThe presence of a calcium pump, calbindin D‐28KD, and calmodulin in the secretory cells (SC) of the oviductal pars convoluta (PC) of Rhinella arenarum was established for the first time in amphibians using immunohistochemical techniques. Marked variations were observed in the localization and degree of expression of these proteins according to ...
Claudia A, Crespo, Marcela F, Medina, Inés, Ramos, Silvia N, Fernández   +3 more
openaire   +2 more sources

Involvement of G protein and purines inRhinella arenarumoocyte maturation

Zygote, 2012
SummaryWe investigated the participation of Gαiprotein and of intracellular cAMP levels on spontaneous and progesterone-mediated maturation inRhinella arenarumfully grown follicles and denuded oocytes.Although progesterone is the established maturation inducer in amphibians,Rhinella arenarumoocytes obtained during the reproductive period (competent ...
L I, Zelarayán, M T, Ajmat, F, Bonilla, M I, Bühler   +3 more
openaire   +2 more sources

The Chronic Toxicity of Pani-Nps to the Larvae Stage of Rhinella arenarum

Journal of Nanoscience and Nanotechnology, 2016
Fil: Barbero, César Alfredo. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Instituto de Investigaciones en Tecnologías Energéticas y Materiales Avanzados. - Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba.
Ibarra, Luis Exequiel, Bongiovanni Abel, Silvestre Manuel, Barbero, César Alfredo, Rivarola, Viviana, Bertuzzi, Mabel Lucia, Yslas, Edith Inés   +5 more
openaire   +2 more sources

Thermal sensitivity of Rhinella arenarum tadpole at low concentrations of dimethoate pesticides

Comparative Biochemistry and Physiology Part C: Toxicology & Pharmacology
One of the main causes of contamination of aquatic environments, which affects biotic communities, is the use of pesticides in agricultural regions. Amphibians are considered good bio-indicators of aquatic pollution, because they are one of the most susceptible groups to pollution.
Quiroga, Lorena Beatriz, Gordillo, Luciana, Aragon y Traverso, Juan Héctor, Iribas, Francisco Javier, Sanabria, Eduardo Alfredo   +4 more
openaire   +3 more sources

Runway extinction in terrestrial toads (Rhinella arenarum): Instrumental or Pavlovian?

Behavioural Processes
Instrumental appetitive extinction involves the reduction of a previously reinforced response when its occurrence is no longer rewarded. Two experiments with terrestrial toads (Rhinella arenarum) tested whether the occurrence of a nonreinforced response is necessary for response extinction by varying the time of exposure to nonrewarded goal-box stimuli
Rocío C, Fernández, Martín M, Puddington, Mauricio R, Papini, Rubén N, Muzio   +3 more
openaire   +2 more sources