Results 31 to 40 of about 292 (98)

Acción protectora del ácido kaurénico en el estrés oxidativo hepático [PDF]

open access: yes, 2017
El ácido kaurénico es un antioxidante extraído del “frailejón”, la planta más representativa de la flora de los páramos andinos de Venezuela, Colombia y norte de Ecuador.
López-Ortega, A.   +4 more
core   +2 more sources

Using functional traits to explore species diversity of frailejones (Espeletiinae Cuatrec., Asteraceae)

open access: yes, 2022
El uso de datos fenotípicos para delimitar especies es uno de los enfoques menos explorados en sistemática. Los Modelos Mixtos Normales (MMN) proporcionan un marco útil para comprobar la existencia de especies distintas basándose en información fenotípica multivariada. En consecuencia, los rasgos funcionales pueden utilizarse como datos de entrada para
openaire   +1 more source

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

open access: yes, 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.   +11 more
core   +1 more source

Identifying and mapping individual plants in a highly diverse high-elevation ecosystem using UAV imagery and deep learning

open access: yes, 2020
The identification and counting of plant individuals is essential for environmental monitoring. UAV based imagery offer ultra-fine spatial resolution and flexibility in data acquisition, and so provide a great opportunity to enhance current plant and in ...
Atkinson, Peter   +5 more
core   +2 more sources

Avian biodiversity losses from grazing of high Andean páramo [PDF]

open access: yes, 2023
Páramos are high-elevation grassland-dominated ecosystems of the northern Andes that harbour large numbers of small-ranged and endemic species and provide important ecosystem services.
Barlow, J.   +8 more
core   +1 more source

Current and future distributions of Espeletiinae (Asteraceae) in the Venezuelan Andes based on statistical downscaling of climatic variables and niche modelling

open access: yesPlant Ecology & Diversity, 2018
خلفية: Páramos هي النظم الإيكولوجية عالية الارتفاع في جبال الأنديز الاستوائية الرطبة، وتتميز بوجود ورود عملاقة من قبيلة Espeletiinae الفرعية (Asteraceae). من المرجح أن يقلل تغير المناخ المتوقع من مدى المنطقة المناسبة مناخياً/التي تشغلها حالياً Espeletiinae وأنماط توزيع الارتفاعات الخاصة بها .الأهداف: كان الهدف من هذه الدراسة هو تقدير الآثار المحتملة ...
Jesús Mavárez   +4 more
openaire   +3 more sources

Conversatorio sobre frailejones de Colombia: revisión del estado de conservación y amenaza [PDF]

open access: yes, 2017
Colombia tiene a la fecha 88 especies descritas de frailejones, 75 de las cuales son endémicas para el país. Con el conocimiento disponible hace casi dos décadas, Colombia adelantó una primera evaluación del estado de conservación, reportando 36 especies
Castellanos-Castro, Carolina   +1 more
core  

Analysis of kaurenic acids present in Espeletiopsis angustifolia Cuatrec from the Venezuelan Andes [PDF]

open access: yes, 2015
Espeletiopsis angustifolia fue recolectada en el páramo San José de Acequias (Estado Mérida) a 2870 m.s.n.m. Las hojas secas y molidas se extrajeron con una mezcla de hexano-éter dietílico (3:1).
Carmona Arzola, Juan Antonio   +4 more
core   +1 more source

Genetic structure and diversity of Calycolpus moritzianus (Myrtaceae) in the north-eastern Andes of Colombia [PDF]

open access: yes, 2021
The Arrayán tree (Calycolpus moritzianus) is an endemic species from northern South America and it is important for its potential in the medical and cosmetic industry. However, to take advantage of its applied potential different biological aspects, such
Andrés Mauricio Posso-Terranova   +5 more
core   +2 more sources

Challenges and opportunities for restoration of high-elevation Andean peatlands in Ecuador [PDF]

open access: yes, 2022
Páramo peatlands are a regional reservoir of biodiversity and ecosystem services, accumulating large amounts of carbon and buffering water flows. Despite their importance, they have a long history of use and impacts including drainage for agriculture and
Arellano, Paul   +7 more
core   +1 more source

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