Results 11 to 20 of about 582 (132)

Mitochondrial Distribution Patterns and Remodeling During In Vitro Maturation of Alpaca (Vicugna pacos) Oocytes [PDF]

Biology
Mitochondrial distribution and activity are closely associated with cytoplasmic maturation and developmental competence in mammalian oocytes; however, limited information is available regarding these processes in Vicugna pacos.
Paula Quijano, Alejandra Ugarelli, José Sánchez, Omar Ramirez, Alexei Santiani, Shirley Evangelista-Vargas   +5 more
doaj   +2 more sources

A multicenter, prospective sibling oocyte study revealed that HyperSperm™ improves the number and quality of embryos in patients undergoing in vitro fertilization [PDF]

Journal of Translational Medicine
Background Assisted reproductive technologies (ART), including in vitro fertilization (IVF), have transformed the treatment of infertility; however, success rates remain suboptimal.
Natalia Oscoz-Susino, Matias D. Gómez-Elías, Claudio Bisioli, Marcos Horton, Mercedes Papayannis, Evelyn De Martino, Laura Kopcow, Martin Attie, Mariano Lavolpe, Carlos Carizza, Guillermina M. Luque, Carolina Baro Graf, Valentina Torres Monserrat, Estefania Navall, Mariano G. Buffone, Dario Krapf   +15 more
doaj   +2 more sources

Endometriosis disrupts oocyte metabolism and cortical granule function, impairing fertilization [PDF]

Reproductive Biology and Endocrinology
Background Endometriosis is a chronic inflammatory disease strongly associated with reduced oocyte quality and subfertility, yet the underlying cytoplasmic defects remain poorly understood.
Omar G. Klinsky, Paula A. Wetten, Julio E. Romani, Emilia C. Abraham, Marcela A. Michaut   +4 more
doaj   +2 more sources

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

De Novo Transcriptome Assembly Reveals Insights Into Osmoregulation and Oxidative Stress Response in the Gills of the Southern King Crab (<i>Lithodes santolla</i>). [PDF]

Ecol Evol
The Southern King Crab (Lithodes santolla), an ecologically and commercially important species in sub‐Antarctic waters. In this study, we assembled the first gill de novo transcriptome of L. santolla to characterize gene expression related to environmental responses.
Brante A, Bustos P, Ortega-Muñoz C, Acuña Gómez EP, Brante V, Farlora R.   +5 more
europepmc   +2 more sources

Which, when, and where traits matter: functional trait-mediated species associations shift with microenvironmental and climatic variation. [PDF]

New Phytol
Community‐level fitted relationship between spatial association Lij and trait dissimilarity (tDij) at the fine spatial scale (r = 40 mm; where r represents the radius around individuals of the focal species). Summary Predicting coexistence in species‐rich plant communities requires understanding the role of functional traits in species interactions and
Antorán E, Calatayud J, Peralta AL, Escudero A, Sánchez AM, Luzuriaga AL, de la Cruz M.   +6 more
europepmc   +2 more sources

New records of Amphisbaena medemi Gans &amp; 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

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

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

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