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Mostrando ítems 1-20 de 20531
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1,1-Diphenyl-4-(thiophen-2-yl)but-3-yn-1-ol
(2018-11)The asymmetric unit of the title homopropargyl alcohol, C20H16OS, contains two independent molecules comprising a hydroxy group, a 3-(2-thiophenyl)- propargylic moiety and two aromatic rings linked to a central carbon atom. ... -
1,3-Bis{[(2,6-dimethylphenyl)sulfanyl]methyl}benzene
(2019)The structure of the title compound, C24H26S2, an example of a pincer ligand with an SCS-chelation motif, illustrates the steric effects of the methyl groups in the thiophenyl rings at the 2- and 6-positions, forcing a ... -
1-Nitro-4-(1-propyn-1-yl)benzene
(2019)The title compound, C9H7NO2, was prepared by alkynylation of 4-iodonitrobenzene with 1,3-dilithiopropyne in the presence of 1 equivalent of CuI and catalytic amounts of Pd(PPh3)2Cl2. The complete molecule is generated ... -
11'-α-Tocomonoenol is the major α-tocomonoenol isomer in cyanobacteria and microalgae from Costa Rica
(2022)α-Tocomonoenols are vitamin E-derivatives with a single double-bond in the tocochromanol sidechain. Currently, two congeners are known: 11′-α-tocomonoenol and 12′-α-tocomonoenol, the later better known as “marine-derived ... -
12 de octubre. Día de las culturas.
(2013-04-06)Nota enviada a la dirección de la Escuela de Bibliotecología con referente a la celebración del 12 de octubre, días de las culturas, 2 de octubre de 2012“La pluma, dichosamente, es el terreno de los conocimientos y de los ... -
12-HETE is a regulator of PGE2 production via COX-2 expression induced by a snake venom group IIA phospholipase A2 in isolated peritoneal macrophages
(2020)The snake venom myotoxin (MT)-III is a group IIA secreted phospholipase A2 (sPLA2) with pro-inflammatory activities. Previous studies have demonstrated that MT-III has the ability to stimulate macrophages to release ... -
1999
(Universidad de Costa Rica, 1999) -
(1S,3R)-N-{(3S,10S,12S,13R,17R)-12-Hydroxy-17- [(R)-5-hydroxypentan-2-yl]-10,13-dimethylhexa- decahydro-1H-cyclopenta[a]phenanthren-3-yl}- adamantane-1-carboxamide 0.25-hydrate
(2022-10-12)The title compound, C 35H 57 NO 3 0.25H 2O, was synthesized from deoxycholic acid followed by a protection, a Mitsonobu substitution, a Staudinger reduction, formation of an amide and final reduction in the lateral chain. ... -
2. Presentación
(2011-02-01)La segunda presentación del Anuario Centro de Investigación y Estudios Políticos (vol. 1) fue realizada por el Dr. Alberto Cortés, desde una perspectiva histórica de la creación de la carrera de Ciencias Políticas en la ... -
24 Arquitecturas por Segundo
(2012-08-04)RESUMENEsto que escribo es la transcripción de la charla del 8 de junio del 2011 en la Universidad de Costa Rica, Escuela de Arquitectura. Lo expuesto ese día fue una serie de fragmentos que se sitúan entre el espacio ... -
25 Years of the Internet in Central America: an interview with Guy de Téramond
(2017-10)January 2018 marks the 25th anniversary of the first dedicated Internet connection in Central America. Little is known about the conditions that characterised the early development of the Internet in this part of the globe. ... -
(2922) Proposal to conserve the name Loasa rudis (“Nasa rudis”) against L. rhoeadifolia (Loasaceae)
(2022-10-17)The genus Nasa was established by Weigend in 2006, encompassing species previously classified under Loasa. The distinction between the two genera is supported by the presence of a single bract per flower, a unique structure ... -
2D SLAM Algorithms Characterization, Calibration, and Comparison Considering Pose Error, Map Accuracy, CPU Usage, and Memory Usage
(2022)The present work proposes a method to characterize, calibrate, and compare, any 2D SLAM algorithm, providing strong statistical evidence, based on descriptive and inferential statistics to bring confidence levels about ...