Browsing Ciencias básicas by Title
Now showing items 2462-2481 of 3078
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S-matrix from the metaplectic representation
(1992-03)We show how the S-matrix for bosons in an external field can be derived directly from the infinite dimensional metaplectic representation, in terms of the classical scattering operator. -
Salinity effect on embryonic development and survival of the first zoeal stage of Macrobrachium tenellum (Smith, 1871) (Crustacea, Palaemonidae)
(2018)The objective of this work is to provide information to understand the effect of different salinities on the survival of embryos and newly-hatched larvae of Macrobrachium tenellum. The survival of M. tenellum embryos was ... -
Salivary gland morphology, tissue tropism and the progression of tospovirus infection in Frankliniella occidentalis
(2016)Tomato spotted wilt virus (TSWV) is transmitted by thrips in a propagative manner; however, progression of virus infection in the insect is not fully understood. The goal of this work was to study the morphology and infection ... -
sandy.beaches.ecology.cvs
(2019-01)The data were taken from 28 sandy beaches of Costa Rica (16 from the Pacific Coast and 12 from the Caribbean). This study aimed to (1) determine the differences of sediment and beach characteristics between both Pacific ... -
Sarcoglottis C.Presl
(2022-12)The genus Sarcoglottis was named in 1827 by Czech botanist Carl Borivoj Presl, a professor at the University of Prague. The name comes from the Greek sarkos, meaning flesh, and glotta, tongue, in reference to the texture ... -
Satellite depiction of the evolution of a West African squall cluster
(1989)West African squall lines or disturbance lines have been studied by several investigators (e.g., Hamilton and Archbold 1945; Eldridge 1957; Fortune 1980; Fernandez 1982a, 1982b) and their climatological aspects are, in ... -
Scaling of stem diameter and height allometry in 14 neotropical palm species of different forest strata Gerardo
(2019)Tropical palms reach tree-like heights without a vascular cambium through sustained cell expansion and lignification of primary tissues, but only a fraction of palms have been explored in their allometric relationships. ... -
Scaphosepalum Pfitzer
(2022)There are just over 50 species of Scaphosepalum Pfitzer recog- nized today. They are widely distributed from Mexico to Bolivia and the Guyana Shield, with the highest species diversity found in the northern Andes, especially ... -
Scirtothrips menai sp.n., a new species from Costa Rica, Central America (Thysanoptera, Terebrantia, Thripidae)
(2016)The genus Scirtothrips Shull 1909 is characterized by small, pale, active thrips with no more than 1500 μm in length that feed generally on young leaves. Most species feed on a few host plants, while others are polyphagous, ... -
Screening of Latin American plants for antiparasitic activities against malaria,Chagas disease, and leishmaniasis
(2010)In order to explore rationally the medical potential of the plant biodiversity of the Central and South American region as a source of novel antiparasitic molecules, a multinational Organization of American States (OAS) ... -
Screening of Latin American Plants for Cytotoxic Activity
(2006)The SRB cytotoxicity assay was used to screen plant extracts, in a collaborative multinational OAS project involving Argentina, Bolivia, Colombia, Costa Rica, Guatemala, Nicaragua and Panama, against breast (MCF-7), lung ... -
Seagrass morphometrics at species level in Moreton Bay, Australia from 2012 to 2013
(2017)Seagrass above, below and total biomass, density and leaf area, length and width were quantified at a species level for 122 sites over three sampling periods in Moreton Bay, Australia. Core samples were collected in two ... -
Seagrass organic carbon stocks show minimal variation over short time scales in a heterogeneous subtropical seascape
(2018)Blue carbon initiatives require accurate monitoring of carbon stocks. We examined sources of variability in seagrass organic carbon (Corg) stocks, contrasting spatial with short temporal scales. Seagrass morphology and ... -
Seagrasses benefit from mild anthropogenic nutrient additions
(2022)Seagrasses are declining globally, in large part due to increased anthropogenic coastal nutrient loads that enhance smothering by macroalgae, attenuate light, and are toxic when in excessive concentrations of inorganic ... -
Seagrasses of Costa Rica: from the mighty Caribbean to the dynamic meadows of the Eastern Tropical Pacific
(2018)Seagrass meadows are declining worldwide, mostly attributed to anthropogenic disturbances. Understanding the dynamics of these meadows is urgent in order to establish adequate management and conservation strategies. Here, ... -
Search for gamma-ray emission from star-forming galaxies with Fermi LAT
(2016-08)Recent studies have found a positive correlation between the star-formation rate of galaxies and their gamma-ray luminosity. Galaxies with a high star-formation rate are expected to produce a large amount of high-energy ... -
Seasonal changes of the microplankton community along a tropical estuary
(2015-11)Microplankton organisms are an important link in the transfer of matter and energy between the benthic–pelagic microbial food web and higher trophic levels in estuaries. Although tropical estuaries are among the most ... -
Seasonal patterns of parasitism of the tropical spiders Theridion evexum (Araneae, Theridiidae) and Allocyclosa bifurca (Araneae, Araneidae) by the wasps Zatypota petronae and Polysphincta gutfreundi (Hymenoptera, Ichneumonidae)
(2008)Las tasas de parasitismo de Theridion evexum por la avispa parasitoide Zatypota petronae y de Allocyclosa bifurca por Polysphincta gutfreundi fueron estudiadas durante dos años. El parasitismo en T. evexum fue muy bajo ... -
Seasonal phenology of Sargassum liebmannii J. Agardh (Fucales, Heterokontophyta) in an upwelling area of the Eastern Tropical Pacific
(2014)Seasonal changes in growth, biomass, abundance and reproduction of brown algae have been reported from subtropical and temperate regions, but there are very few reports from tropical regions, and none from the Eastern ... -
Seasonal prediction of extreme precipitation events and frequency of rainy days over Costa Rica, Central America, using Canonical Correlation Analysis
(Advances in Geosciences 33:41-52, 2013-04-02)High mountains divide Costa Rica, Central America, into two main climate regions, the Pacific and Caribbean slopes, which are lee and windward, respectively, according to the North Atlantic trade winds – the dominant wind ...