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Temporal variations in fumarole gas chemistry at Poás volcano, Costa Rica
(2015-03)
We report the chemical and isotopic composition of fumarole gas discharges collected at Poás Volcano, Costa Rica from 2001 to 2014, covering a period during which the volcano experienced a series of phreatic eruptions ...
Sudoku Puzzles for First-Year Organic Chemistry Students
(2007-04)
We use sudoku puzzles to help the students (i) learn the correspondence between the names of the amino acids, their abbreviations, and codes and (ii) learn the correspondence between the names of the functional groups, ...
Fisico-química de las aguas superficiales de la Cuenca del río Rincón, Península de Osa, Costa Rica
(2010-12)
The Rincon River Basin is characterized by steep and rugged topography with outcrops of recent sediments as well as igneous and sedimentary rocks. The area is mostly covered by forest (Tropical Wet Forest) and agricultural ...
Removal of N-nitrosodimethylamine precursors with powdered activated carbon adsorption
(2016-01-01)
The main objective of this study was to examine the roles of powdered activated carbon (PAC) characteristics (i.e., surface chemistry, pore size distribution, and surface area) in the removal of N-nitrosodimethylamine ...
Phosphatidylinositol 3-Kinase/Akt Pathway Targets Acetylation of Smad3 through Smad3/CREB-binding Protein Interaction: Contribution to transforming growth factor 1-induced epstein-barr virus reactivation
(THE JOURNAL OF BIOLOGICAL CHEMISTRY 284(36), pp. 23912–23924, 2009-09-04)
Epstein-Barr virus, a ubiquitous human herpesvirus, is associated with the development of carcinomas and lymphomas. We previously showed that transforming growth factor 1 (TGF- 1) mediated the virus to enter the lytic ...
Phospholipase C and sphingomyelinase activities of the Clostridium perfringens Alfa-toxin
(Chemistry and Physics of Lipids, 2009-02)
Alfa-Toxin is a major pathogenic determinant of Clostridium perfringens, the causative agent of gas gangrene. Alfa-Toxin has been known for long to be a phospholipase C, but up to now its hydrolytic properties have been ...
From Fangs to Pharmacology: The Future of Snakebite Envenoming Therapy
(2016)
The snake is the symbol of medicine due to its association with Asclepius, the
Greek God of medicine, and so with good reasons. More than 725 species of venomous
snakes have toxins specifically evolved to exert potent ...
Reactivity and structure of derivatives of 2-hydroxy-1,4-naphthoquinone (lawsone)
(2007-11)
The structures of two derivatives of 2-hydroxy-1,4-naphthoquinone (lawsone) are examined using the density functional theory (DFT) hybrid functional B3LYP. Using the optimized structure of lawsone acetate, the reactivity ...
Pristine but metal-rich Río Sucio (Dirty River) is dominated by Gallionella and other iron-sulfur oxidizing microbes
(2017-03)
Whether the extreme conditions of acidity and heavy metal pollution of streams and rivers originating in pyritic formations are caused primarily by mining activities or by natural activities of metal-oxidizing microbes ...
Los alucinógenos: su historia, antropología, química y farmacología
(Psicogente, 13 (23): pp. 174-192., 2010-06)
Por muchas décadas, los alucinógenos han sido considerados como sustancias psicogénicas.
Este trabajo busca des-demonizar el tema y exponer objetivamente la historia, la antropología,
la química y la farmacología de ...