Results 111 to 120 of about 45,414 (251)

The epiphyllous habit in the hepatic genus Frullania [PDF]

open access: yes, 1999
We report for the first time 11 species of Frullania growing as epiphylls in New Zealand, New Caledonia, and Colombia . Also listed are 29 Frullania species that have previously been recorded growing as epiphylls in other regions of the world.
Braggins, John E.   +1 more
core  

U-Pb Geochronology of detrital zircons from the Venezuelan passive margin: implications for an Early Cretaceous Proto-Orinoco river system and Proto-Caribbean ocean basin paleogeography

open access: yesGeologica Acta, 2012
The Guyana Shield has long been interpreted as the source of siliciclastic detritus within the Cretaceous passive margin strata of northern Venezuela. We have determined  U-Pb ages of detrital zircons separated from Early Cretaceous strata of the passive
M.I. NOGUERA   +3 more
doaj  

Trypanosoma (Duttonella) vivax: Its biology, epidemiology, pathogenesis, and introduction in the New World - a review [PDF]

open access: yes, 2008
The biology, epidemiology, pathogenesis, diagnostic techniques, and history of the introduction of Trypanosoma (Duttonella) vivax in the New World are reviewed.
Desquesnes, Marc   +5 more
core  

Guyana’s paediatric training program: a global health partnership for medical education

open access: yesCanadian Medical Education Journal, 2017
Guyana is a low-middle income country on the northern coast of South America between Venezuela and Suriname. Guyana has relatively high child mortality and a notable gap in health care provision.
Lita Cameron   +5 more
doaj  

New bryophyte taxon records for tropical countries 2 [PDF]

open access: yes, 1998
Norris & T. Kop. Sabah, Mt. Kinabalu, Mary Strong Clemens. 10741, 15.11.1915 (L) as „Campylopus metzlerioides Broth. nom. nud.“ The species was known before (mostly as Atractylocarpus comosus Dix.) from Sumatra, Celebes, New Guinea, Bhutan and Nepal [JPF]
Eggers, Jens   +2 more
core  

What Explains Cross-Border Migration in Latin America? [PDF]

open access: yes
What accounts for the differences in rates of emigration from Latin America compared with those from other sending regions such as Asia and Africa? Why do cross-border migration rates vary so much across Latin America? What explains those rates?
Jeffrey G. Williamson   +2 more
core  

THE BORDER ISSUE BETWEEN GUYANA AND VENEZUELA AND THE SOUTH AMERICAN INTEGRATION

open access: yesRevista Conjuntura Austral, 2012
This article intends to analyze the border issue between Guyana and Venezuela, trying to detect new mechanisms to solve it. These two countries take part in the regional integration process materialized by the South American Nations Union (Unasur), therefore this may be the moment to close the issue.
openaire   +2 more sources

Comparison of four different programs for the analysis of hemispherical photographs using parameters of canopy structure and solar radiation transmittance [PDF]

open access: yes, 2013
There have been many studies involving the use of hemispherical photographs to indirectly estimate canopy structures and forest light environments.
Butler-Manning, David   +6 more
core  

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