Browsing Ciencias básicas by Title
Now showing items 1894-1913 of 3078
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N-[3-(Prop-1-yn-1-yl)phenyl]benzenesulfonamide
(2019)In the title sulfanilamide derivative, C15H13NO2S, which shows significant activity against Staphylococcus aureus and Escherichia coli, the dihedral angle between the planes of the aromatic rings is 62.15 (19)° and the ... -
Naphthalenones and Isocoumarins from a Costa Rican Fungus Xylariaceae sp. CR1546C
(2014)A new naphthalenone, (R)-4,6,8-trihydroxy-3,4-dihydro-1(2H)-naphthalenone and a new isocoumarin, 6,8-dihydroxy-(3R)-(2-oxopropyl)-3,4-dihydroisocoumarin, together with eight related known compounds were isolated from the ... -
Naproxen degradation test to monitor Trametes versicolor activity in solid-state bioremediation processes
(2010-07-15)The white-rot fungus Trametes versicolor has been studied as a potential agent for the removal of envi ronmental pollutants. For long-time solid-phase bioremediation systems a test is required to monitor the metabolic ... -
Natural History and Larval Behavior of the parasitoid Zatypota petronae (Hymenoptera: Ichneumonidae)
(2007)The koinobiont ectoparasitoid Zatypota petronae Gauld (Ichneumonidae) parasitizes medium-sized immatures of the cobweb spider Theridion evexum Keyserling (Theridiidae). Zatypota petronae apparently attacks the spider inside ... -
Natural history, courtship, feeding behaviour and parasites of Theridion evexum (Araneae: Theridiidae)
(2007)Theridion evexum constructs webs in the understory of wet middle-elevation forests in Costa Rica. The spiders construct retreats by curling a leaf and produce a mesh in front of the opening. Long, more or less vertical ... -
Natural ocean acidification at Papagayo upwelling system (north Pacific Costa Rica): implications for reef development
(2018)Numerous experiments have shown that ocean acidification impedes coral calcification, but knowledge about in situ reef ecosystem response to ocean acidification is still scarce. Bahía Culebra, situated at the northern ... -
Natural product based inhibitors of the thioredoxin-thioredoxin reductase system
(2004)Spiroketal naphthodecalins are readily assembled by Barton's base mediated Ullmann binaphthyl ether coupling, Dakin reactions and hypervalent iodine spirocyclization. The core structures can be further diversified by enone ... -
Natural variability vs forced signal in the 2015–2019 Central American drought
(2021)The recent multi-year 2015–2019 drought after a multi-decadal drying trend over Central America raises the question of whether anthropogenic climate change (ACC) played a role in exacerbating these events. While the ... -
Nature of crustal terranes and the Moho in northern Costa Rica from receiver function analysis
(2010-01)The Central American subduction zone in northern Costa Rica shows along‐strike variations in both the incoming and overriding plates. By analyzing the subducting oceanic Moho (M1) and the upper plate Moho (M2) with receiver ... -
NC10 bacteria in marine oxygen minimum zones
(2016-08-10)Bacteria of the NC10 phylum link anaerobic methane oxidation to nitrite denitrification through a unique O2-producing intra-aerobic methanotrophy pathway. A niche for NC10 in the pelagic ocean has not been confirmed. We ... -
Near-neighbor tropical epiphytic orchids keep distinct mycorrhizal communities across their distribution in Costa Rica
(2022)Environmental and biotic axes act in combination to define the ecological niches of plant species. Two species with shared physical space are expected to compete for access to water and nutrients. In hyper-diverse areas ... -
Negative Thermal Expansion in Open Perovskites near the Precipice of Structural Stability
(2018)Negative thermal expansion (NTE) describes the anomalous propensity of materials to shrink when heated. Since its discovery, the NTE effect has been found in a wide variety of materials with an array of magnetic, electronic ... -
Negative thermal expansion near two structural quantum phase transitions Connor
(2017-12-18)Recent experimental work has revealed that the unusually strong, isotropic structural negative thermal expansion in cubic perovskite ionic insulator ScF3 occurs in excited states above a ground state tuned very near a ... -
Neither insects nor wind: ambophily in dioecious Chamaedorea palms (Arecaceae)
(2014)Pollination of Neotropical dioecious trees is commonly related to generalist insects. Similar data for non‐tree species with separated genders are inconclusive. Recent studies on pollination of dioecious Chamaedorea palms ... -
Neotectóncia de la Falla Cipreses, Costa Rica
(2019)La falla Cipreses se localiza en la parte central de Costa Rica, en la zona más poblada del país. En esta investigación se analiza esta falla a partir de aspectos geomorfológicos, geológicos ... -
Neotectónica del extremo oriental del Cinturón Deformado del Centro de Costa Rica
(2003)El Cinturón Deformado del Centro de Costa Rica corresponde con un ancho sistema de fallas neotectónicas que atraviesa transversalmente a Costa Rica, desde la fosa Mesoamericana, en el lado pacífico, hasta el Cinturón ... -
Neotropical Birds Respond Innately to Unfamiliar Acoustic Signals
(2022)Many animals respond to heterospecific signals that indicate the presence of food or predators. Although the benefits of responding are clear, the behavioral and cognitive mechanisms underlying responses are not. Whether ... -
Neotropical flowering epiphyte diversity: local composition and geographic affinities
(2013)Worldwide, the highest diversity of vascular epiphytic plants resides in the Neotropics. The general pattern of taxonomic composition of the neotropical epiphytic flora has been described, but information regarding the ... -
Neotropical freshwater crabs (Decapoda: Pseudothelphusidae) shred leaves
(2020)Freshwater crabs are macroconsumers that are commonly found in Neotropical headwater streams that may play a key role in energy flow and nutrient cycling in detrital food webs. Although studies have examined the feeding ... -
Nephila clavipes spiders (Araneae: Nephilidae) keep track of captured prey counts: testing for a sense of numerosity in an orb-weaver
(Animal Cognition DOI 10.1007/s10071-014-0801-9, 2014-08-28)Nephila clavipes golden orb-web spiders accumulate prey larders on their webs and search for them if they are removed from their web. Spiders that lose larger larders (i.e., spiders that lose larders consisting of more ...