Results 1 to 10 of about 31,679 (182)

End of the Season Blues: Senescence and Reproductive Trade-Offs in Male Scorpions [PDF]

Insects
Seasonal reproductive dynamics and senescence have profound impacts on male fertility, yet these processes remain understudied in scorpions. This study investigates how reproductive parameters—such as testicular mass, sperm quantity, and viability—change
David E. Vrech, Mariela A. Oviedo-Diego, Paola A. Olivero, Alfredo V. Peretti   +3 more
doaj   +2 more sources

New records of Amphisbaena medemi Gans & Mathers, 1977 (Squamata: Amphisbaenidae) from the Caribbean region of northern Colombia [PDF]

Check List, 2015
This report extends the distribution range of Amphisbaena medemi to the southeast foothills of the Sierra Nevada de Santa Marta and western foothills of the Serranía del Perijá in La Guajira department, Colombia.
Fabio Meza-Joya
doaj   +3 more sources

First records of two rain frogs, genus Pristimantis (Anura, Craugastoridae), for Colombia [PDF]

Check List, 2016
Pristimantis yukpa and P. rivasi are two rain frogs recently described from Sierra de Perijá in Venezuela. Although these species have been expected to occur in the Colombian side of this mountain range, no evidence of their presence was available to ...
Fabio Meza-Joya
doaj   +3 more sources

Membrane Potential Assessment by Fluorimetry as a Predictor Tool of Human Sperm Fertilizing Capacity

Frontiers in Cell and Developmental Biology, 2020
Mammalian sperm acquire the ability to fertilize eggs by undergoing a process known as capacitation. Capacitation is triggered as the sperm travels through the female reproductive tract.
Carolina Baro Graf, Carolina Baro Graf, Carla Ritagliati, Valentina Torres-Monserrat, Cintia Stival, Carlos Carizza, Mariano G. Buffone, Dario Krapf, Dario Krapf   +8 more
doaj   +1 more source

First record of Ninia atrata (Hallowell, 1845) (Squamata: Colubridae) from Sierra Nevada de Santa Marta, northern Colombia [PDF]

Check List, 2015
The current work provides the first confirmed record of Ninia atrata in the northern foothills of the Sierra Nevada de Santa Marta, La Guajira department, Colombia. This record extends the Colombian known species’ distribution ca.
Fabio Meza-Joya
doaj   +3 more sources

Euphonia hirundinacea: Observaciones reproductivas en las Altas Montañas, Veracruz, México

Huitzil, 2020
El estudio de la biología reproductiva de las aves permite predecir e identificar especies susceptibles a un mayor riesgo de extinción o llevar a cabo manejo de poblaciones con fines de conservación.
Axel Fuentes Moreno, Angel Ivan Contreras Calvario, Abigail Mora Reyes, Macario Fernandez Popo   +3 more
doaj   +1 more source

Live imaging of cortical granule exocytosis reveals that in vitro matured mouse oocytes are not fully competent to secrete their content

Biology Open, 2018
Oocyte in vitro maturation does not entirely support all the nuclear and cytoplasmic changes that occur physiologically, and it is poorly understood whether in vitro maturation affects the competence of cortical granules to secrete their content during ...
Andrea I. Cappa, Matilde de Paola, Paula Wetten, Gerardo A. De Blas, Marcela A. Michaut   +4 more
doaj   +1 more source

Autopsia molecular en muerte súbita cardiaca neonatal mediante secuenciación de siguiente generación (NGS): presentación de un caso

Repertorio de Medicina y Cirugía, 2018
Presentamos un caso de muerte súbita de una lactante de tres meses de edad. La autopsia reveló una miocardiopatía hipertrófica y la muestra de sangre del cordón umbilical almacenada fue utilizada para análisis molecular.
Eliana del Pliar Garzón Venegas, Cladelis Rubio Gómez, Suleima Carpeta Sánchez, Jennifer Vélez Segura, Jenny Blanco Gómez, Paola Andrea Beltrán Moreno, Diana Sánchez MD, Claudia Juliana Serrano MD, Juan Carlos Bonilla   +8 more
doaj   +1 more source

Sistema reproductivo y biología floral de Lantana camara (Verbenaceae) en una población ribereña del Río de la Plata

Boletín de la Sociedad Argentina de Botánica, 2019
Introducción y objetivos: La biología floral de Lantana camara, nativa del Centro y Sur de América e invasora cosmopolita, tiene aspectos desconocidos y controvertidos.
María T. Amela García, Diego Aquino, Agustina Bouza, Mariana C. Grohar, Anahí N. Herrera Cano, Maitén Lafuente Díaz, María B. Miguez, Victoria Scorza, Marina Chamer   +8 more
doaj   +1 more source

In Adult Rats With Polycystic Ovarian Syndrome, Unilateral or Bilateral Vagotomy Modifies the Noradrenergic Concentration in the Ovaries and the Celiac Superior Mesenteric Ganglia in Different Ways

Frontiers in Physiology, 2019
In rats with polycystic ovarian syndrome (PCOS) induced by estradiol valerate (EV) injection, sectioning of the vagus nerve in the juvenile stage restores ovulatory function, suggesting that the vagus nerve stimulates the onset and development of PCOS ...
Rosa Linares, Gabriela Rosas, Elizabeth Vieyra, Deyra A. Ramírez, Daniel R. Velázquez, Julieta A. Espinoza, Carolina Morán, Roberto Domínguez, Leticia Morales-Ledesma   +8 more
doaj   +1 more source