Results 201 to 210 of about 35,712 (241)
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Carotenoids in certain lichens from the Colombian Andes
Feddes Repertorium, 2003AbstractReverse‐phase high‐performance liquid chromato‐graphy, column and thin‐layer chromatography re‐vealed the presence of following carotenoids in the thalli of 10 species (14 specimens) of lichens from the Colombian Andes: β‐carotene, β‐cryptoxanthin, zeaxanthin, lutein, calthaxanthin, caloxanthin, 3′‐hydroxyechinenone, canthaxanthin ...
B. Czeczuga +2 more
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The Colombian Andes During Cretaceous Times
1994During Cretaceous times, the Colombian Andes underwent major geological changes. In the Colombian East, which is located east of the Otu-Pericos fault, distension and subsidence brought about the formation of a large basin in which thick sequences of epicontinental sediments were deposited.
J. F. Toussaint, J. J. Restrepo
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Trends, stability and stress in the Colombian Central Andes
Climatic Change, 2011Mountain ecosystems have been projected to experience faster rates of warming than surrounding lowlands. These changes in climatic conditions could have significant impacts on high-altitude Andean environments, affecting the quality and magnitude of their economic and environmental services.
Daniel Ruiz +2 more
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Cinchona Officinalis in the Colombian Andes
Journal of Forestry, 1946Abstract Following conquest of the Netherlands East Indies by the Japanese, natural stands of cinchona trees in the Andes mountains of South America were exploited to supply military and civilian needs for natural antimalarial alkaloids.
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Strike-slip deformation within the Colombian Andes
Geological Society, London, Special Publications, 2007AbstractThe Colombian Andes are characterized by a dominant NE structural trend, which is offset by ENE-trending right-lateral and NW-trending left-lateral structures. NE-trending faults are either dip-slip or oblique thrusts, generated as a result of a trans-pressive regime active since at least Palaeogene times.
Jorge Acosta +4 more
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The Quaternary glacial record of the Colombian Andes
2004Abstract The onset of glaciations in the Colombian Andes as recorded by the start of glaciofluvial sedimentation in the inter-montane Bogota basin is dated near the Gauss/Matuyama polarity reversal at 2.6 Ma; episodes of increased glacial activity occurred since ca. 0.8 Ma.
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Peasant essentialism and the Agrarian question in the Colombian Andes
The Journal of Peasant Studies, 1990Our Daily Bread: The Peasant Question and Family Farming in the Colombian Andes, by Nola Reinhardt. Berkeley, CA: University of California Press, 1988. Pp.xv + 308. US$35. This review article considers a number of problems which arise from an incorrect theorisation of the agrarian question.
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Understanding deforestation in montane and lowland forests of the Colombian Andes
Regional Environmental Change, 2010Colombian Andean forests cover nine million ha. These forests provide an informative case study of mountain deforestation in South America. They are surrounded by tropical lowland forests, and they host most of the country’s human population. This study evaluates the relative importance of human and natural variables in deforestation of the Colombian ...
Dolors Armenteras +3 more
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Convulsive Events, a Widespread Hazard in the Colombian Andes
2009Colombia’s mountain regions are densely populated, and their geological, climatic, and geographic characteristics imply not only very variegated landscapes but also exposure to many risks of natural origin: earthquakes, volcanic activity, torrential floods, floods, and landslides.
Michel Hermelin, Natalia Hoyos
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Phylogenetic Structure of Two Euglossine Communities Divided by the Colombian Andes
Neotropical EntomologyThe alarming decline in bee populations throughout the world makes it imperative to understand the dynamics of its communities in undersampled tropical regions such as Colombian Choco and Amazon. Euglossine bees, also known as orchid bees, are the primary pollinators of orchids in the Neotropical region, and little is known about the resilience of ...
Edward Hernan Molina-Henao +5 more
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