Results 41 to 50 of about 2,307 (204)

Rhodium catalyzed hydroformylation of kaurane derivatives: A route to new diterpenes with potential bioactivity [PDF]

, 1988
Kaurenic and grandiflorenic acids are naturally occurring diterpenes whose biological activity has been described. Both acids contain an exocyclic methylenic double bond that allows further functionalization on their structure.
Peixoto, Andreia F., Melo, Daniela S. de, Fernandes, Tânia F., Fonseca, Yuraima, Gusevskaya, Elena V., Silva, Artur M. S., Contreras, Ricardo R., Reyes, Marisela, Usubillaga, Alfredo, Santos, Eduardo N. dos, Pereira, Mariette M., Bayón, J. Carles   +11 more
core   +1 more source

So Young, So Rich: Habitat Shifts Combined With Trait Evolution Promoted Species Radiation in Senecio in the Andes

Journal of Biogeography, Volume 52, Issue 8, August 2025.
ABSTRACT Aim The outstanding Andean biodiversity has been linked to the occurrence of evolutionary radiations that are common among high‐elevation plant lineages. One of the most iconic examples is found in the species‐rich genus Senecio, with an impressive variation in growth forms and habitat preference.
Luciana Salomón, Juan Manuel Gorospe, Tomáš Fér, Filip Kolař, Petr Sklenář, Roswitha Schmickl   +5 more
wiley   +1 more source

Assessing Mountain Soil Water Storage and Release in a Colombian Páramo With APSIS‐InSAR Data

Hydrological Processes, Volume 39, Issue 7, July 2025.
InSAR detects seasonal soil swelling across a páramo ridge. Ridges swell during the wet season and lower valleys swell in the dry season. Findings indicate flow in the wet season is rapid from ridges through steep slopes and out of the catchment, whereas in the dry season lower valley sediments swell from a cumulative slower flow.
Andrew V. Bradley, David J. Large, Jeffrey Mauricio Prieto Naranjo, Wouter Buytaert, Emily Mitchell, Andrew Sowter, Mauricio Diazgranados, Boris Ochoa‐Tocachi, Charles George, France F. Gerard   +9 more
wiley   +1 more source

Química de especies del genero espeletia Espeletia killipii - Espeletia tunjana

Revista Colombiana de Química, 1994
De las partes aéreas de 2 especies del género Espeletia se aislaron compuestos del tipo diterpeno Acido (-i-)Kaur-9( 11), 16-dien-19-oico, el (-)Kaur-16-en-19-ol, los terpenos friedeiina, sitosterol-estigmasterol, y dos sesquiterpenlactonas del tipo melampólido, Acetato de Longipilin y Polimatin B.
Torrenegra, Rubén Darío, Téllez A., Alba Nohemí, García, Gladys   +2 more
openaire   +2 more sources

Unexpected biodiversity loss under global warming in the neotropical Guayana Highlands: a preliminary appraisal [PDF]

, 2006
The fully vegetated summits of the table mountains that form the Guayana Highlands (GH), in northern South America, hold amazing biodiversity and endemism levels, and unique vegetation types.
Berry, Briceño, Bush, Chapin, Clubbe, Dirnböck, Dullinger, Farrera, Givnish, Grabherr, Halloy, Heywood, Houghton, Huber, Huber, Huber, Jackson, Keller, Körner, Luteyn, Maguire, McCarthy, Molau, Myers, Olsson, Orme, Parmesan, Pauli, Raymo, Root, Rull, Rull, Rull, Rull, Rull, Steyermark, Steyermark, Steyermark, Steyermark, Steyermark, Steyermark, TERESA VEGAS-VILARRÚBIA, VALENTÍ RULL, Watson, WWF, IUCN   +44 more
core   +2 more sources

Marcescence and prostrate growth in tree ferns are adaptations to cold tolerance

Ecography, Volume 2025, Issue 6, June 2025.
Cold tolerance strategies in plants vary from structural to biochemical permitting many plants to survive and grow on sites that experience freezing conditions intermittently. Although tree ferns occur predominantly across the tropics, they also occur in temperate zones and occasionally in areas that experience sub‐zero temperatures, and how these ...
James M. R. Brock, André M. Bellvé, Bruce R. Burns   +2 more
wiley   +1 more source

Diversity of insects associated with Espeletia spp. in the Chingaza páramo (Colombia) and their agroecosystem relevance

Ciencia y Agricultura
The Chingaza paramo is a strategic ecosystem with high entomological richness, where plant-insect interactions often mediated by chemical signals are fundamental to ecological balance.
Eric Nicolas Vargas-Molina, Jenny Liliana García-Morantes, Rubén Darío González-Román   +2 more
doaj   +1 more source

The implications of fire management in the Andean paramo: A preliminary assessment using satellite remote sensing [PDF]

, 2015
The upper ranges of the northern Andes are characterized by unique Neotropical, high altitude ecosystems known as paramos. These tundra-like grasslands are widely recognized by the scientific community for their biodiversity and their important ecosystem
ARMENTERAS Dolors, BORRELLI PASQUALE, MODUGNO Sirio, PANAGOS Panagiotis, SCHÜTT Brigitta   +4 more
core   +1 more source

An Illustrated Diagnostic Key to Species in the Venezuelan Clade of Espeletia (Asteraceae) [PDF]

Harvard Papers in Botany, 2020
An illustrated key is presented to species in the Venezuelan clade of Espeletia (Asteraceae), based on herbarium specimens, virtual herbaria, and fresh samples from field collections. The 54 Espeletia species in this clade are documented: (i) 48 entirely endemic to the Venezuelan Andes, (ii) 2 found as well in the Venezuelan Cordillera de la Costa, the
openaire   +2 more sources

Ecological speciation with gene flow followed initial large‐scale geographic speciation in the enigmatic afroalpine giant senecios (Dendrosenecio)

New Phytologist, Volume 246, Issue 5, Page 2307-2323, June 2025.
Summary Mountains have highly heterogeneous environments that generate ample opportunities for lineage differentiation through ecological adaptation, geographic isolation and secondary contact. The geographic and ecological isolation of the afroalpine vegetation fragments on the East African mountain tops makes them an excellent system to study ...
Juan Manuel Gorospe, Eliška Záveská, Desalegn Chala, Abel Gizaw, Felly Mugizi Tusiime, A. Lovisa S. Gustafsson, Lubomír Piálek, Filip Kolář, Christian Brochmann, Roswitha Schmickl   +9 more
wiley   +1 more source