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Seasonal Variation of Peripheral Blood Leukocyte Telomere Length in Costa Rica: A Population-Based Observational Study
(2014)
ABSTRACT: Objectives: Peripheral blood leukocyte telomere length (LTL) is increasingly being used as a biomarker of aging, but its natural variation in human populations is not well understood. Several other biomarkers ...
Intraspecies variation in the venom of the rattlesnake Crotalus simus from Mexico: Different expression of crotoxin results in highly variable toxicity in the venoms of three subspecies
(2013-07)
The composition and toxicological profile of the venom of the rattlesnake Crotalus simus in
Mexico was analyzed at the subspecies and individual levels. Venoms of the subspecies C. s.
simus, C. s. culminatus and C. s. ...
Genome wide association mapping for the tolerance to the polyamine oxidase inhibitor guazatine in arabidopsis thaliana
(2016)
Guazatine is a potent inhibitor of polyamine oxidase (PAO) activity. In agriculture, guazatine is used as non-systemic contact fungicide efficient in the protection of cereals and citrus fruits against disease. The composition ...
Mitochondrial DNA “clock” for the Amerinds and its implications for timing their entry into North America
(1994-02)
Students of the time of entry of the ancestors of the Amerinds into the New World are divided into two camps, one favoring an "early" entry [more than approximately 30,000 years before the present (YBP)], the other favoring ...
Strong individual signatures and weaker group signatures in contact calls of Spix’s disc-winged bat, Thyroptera tricolor
(2012-01)
Spix’s disc-winged bats, Thyroptera tricolor, form small, long-term social groups in which members are
loyal to a patch of forest but move on a daily basis between highly ephemeral roosting sites (partly unfurled Heliconia ...
Variation in echolocation call frequencies in two species of free-tailed bats according to temperature and humidity
(2017)
Bats can actively adjust their echolocation signals to specific habitats and tasks, yet it is not known if bats also modify their calls to decrease atmospheric attenuation. Here the authors test the hypothesis that individuals ...
Comparison of venom composition and biological activities of the subspecies Crotalus lepidus lepidus, Crotalus lepidus klauberi and Crotalus lepidus morulus from Mexico
(2013-08-01)
The rock rattlesnakes Crotalus lepidus comprise a group (lepidus, klauberi, morulus and
maculosus) of poorly known mountain cold-tolerant snakes in Mexico. In particular, Crotalus
lepidus morulus is a snake endemic of ...
Venom of Bothrops asper from Mexico and Costa Rica: Intraspecific variation and cross-neutralization by antivenoms
(2012-01)
Bothrops asper is the species that induces the highest incidence of snakebite envenomation
in southern Mexico, Central America and parts of northern South America. The intraspecies
variability in HPLC profile and ...
Gene admixture in the Costa Rican population
(Ann Hum Genet; 67 (1) p. 71-80, 2003)
The general population of Costa Rica has sometimes been considered to be the product of an amalgamation
of groups of diverse origin. To determine the magnitude of accumulated admixture since Spanish colonization,
11 ...
Características del nivel del mar en los litorales costarricenses
(Ciencia y Tecnología, 12(1-2): 117-131,1988 San José, Costa Rica, 1988)
La variación del nivel del mar en los litorales costarricenses es un argumento desconocido. Son escasos los estudios que sobre este tema se han realizado y cada vez es mayor la necesidad de entender no sólo la influencia ...