Results 41 to 50 of about 22,114 (294)

Análisis multivariado de las provincias y áreas protegidas de Ecuador basado en la presencia de ranas dardo venenosas (Dendrobatidae) y consideraciones para su conservación

open access: yesLa Granja: Revista de Ciencias de la Vida
La comprensión de los patrones de distribución de las especies es fundamental para desarrollar estrategias de conservación efectivas, especialmente en regiones con alta biodiversidad y endemismo como Ecuador.
Patricio Yanez-Moretta   +4 more
doaj   +1 more source

Aziridination of a Single Carbon Atom in Alkenes via Energy Transfer Catalysis

open access: yesAngewandte Chemie International Edition, EarlyView.
Contrary to traditional alkene aziridination via (formal) nitrene transfer, we herein report a strategy that achieves intermolecular aziridination of a single alkene carbon atom and installs an additional group at the other. Enabled by metal‐free energy transfer (EnT) catalysis, alkenyl boronates and silanes are transformed into reactive intermediates ...
Fritz Paulus   +7 more
wiley   +1 more source

UNA APROXIMACIÓN ESTADÍSTICA PARA EXPLORAR LA RELACIÓN ENTRE LA MORFOMETRÍA DE UNAS RANAS COLOMBIANAS Y SUS HÁBITOS ALIMENTICIOS

open access: yesRevista de la Facultad de Ciencias, 2012
Se realizó un análisis exploratorio de las relaciones de tamaño y forma entre el predador y la presa para 20 especies de ranas (9 géneros y 5 familias) de la reserva forestal La Forzosa, ubicada en el municipio de Anorí, Antioquia, Colombia.
PABLO A. GUZMAN, JUAN CARLOS SALAZAR
doaj  

Oldest well‐preserved euprimate petrosal, from the early Eocene of India (Vastan Lignite Mine, Gujarat)

open access: yesThe Anatomical Record, EarlyView.
Abstract An exquisitely preserved, isolated partial petrosal with associated fragmentary stapes is described from the Vastan Lignite Mine (Gujarat, India), dated to the early Eocene (~54.5 Ma). Several anatomical traits (e.g., large petrosal plate; posterolateral entry of the internal carotid artery to the tympanic cavity; bony tubes surrounding the ...
Mary T. Silcox   +8 more
wiley   +1 more source

Bio-historia

open access: yesRevista de la Facultad de Medicina, 1951
Memorias sobre las ranas (1) (el apareamiento de las ranas) (2) 1736 (Inédito) (3) / memorias sobre los sapos. Sapos de agua (9) (10 de abril de 1740) (Inédito). Versión y notas del Prof. F.
René-Antoine Ferchault de Réaumur   +1 more
doaj  

Green Is the New Gold: Redefining Opulent Lifestyle Through Organic Food Purchases

open access: yesBusiness Strategy and the Environment, EarlyView.
ABSTRACT Prior studies based on the Theory of Planned Behavior mostly examined the effects of health and environmental concerns on organic food consumption; however, few addressed the paradoxical relationships in the context of opulent or symbolic decorum.
Neha Sharma   +3 more
wiley   +1 more source

Topological Kondo effect with Majorana fermions

open access: yes, 2012
The Kondo effect is a striking consequence of the coupling of itinerant electrons to a quantum spin with degenerate energy levels. While degeneracies are commonly thought to arise from symmetries or fine-tuning of parameters, the recent emergence of ...
A. Hewson   +4 more
core   +1 more source

The Degradation of Access‐Based Business Models: Customer Misbehavior and Shared Mobility

open access: yesBusiness Strategy and the Environment, EarlyView.
ABSTRACT Access‐based services are considered one of the strategies to embed sustainability in business models. Yet, because the evolution of these business models has been overlooked, we do not know whether their promise to create triple value is sustained.
Andres Camacho, Carmen Valor
wiley   +1 more source

Ranas, salamandras y caecilias (Tetrapoda: Amphibia) de Colombia

open access: yesBiota Colombiana, 2000
Continuando con el trabajo propuesto por Ruiz et al. (1996), se presenta a continuación un listado de las especies de anfibios pertenecientes a los tres órdenes que conformanel grupo, y las cuales han sido descritas y reportadas en la literatura para el ...
Andrés Rymel Acosta-Galvis
doaj   +6 more sources

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