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Unusual Microbial Xylanases from Insect Guts
(2004-06-07)
Recombinant DNA technologies enable the direct isolation and expression of novel genes from biotopes containing complex consortia of uncultured microorganisms. In this study, genomic libraries were constructed from microbial ...
Synthesis of Iodinated Naphthoquinones Using Morpholine-Iodine Complex
(Synthetic Communications Vol. 34, No. 18, pp. 3389–3397, 2004, 2004)
The efficient synthesis of 2‐hydroxy‐3‐iodo‐1,4‐naphthoquinone (3), 2‐amino‐3‐iodo‐1,4‐naphthoquinone (4), and 2‐iodo‐1,4‐naphthoquinone (5) have been developed using the parent naphthoquinone in combination with the ...
Studies of methamidophos-C-14 in Costa Rican vegetables and soils
(1984)
In order to see the effect of time lapse between the last application of methamidophos and harvesting insecticide was applied on lettuce plants (6,84 μCi in one experiment and 4,03 μCi in the other experiment). Analysis ...
Drying kinetics as Tool for the Assessment of Dynamic Porosity of Catalyst-Support Materials
(2018)
Critical drying fraction data (xc) were obtained for a series of porous materials, frequently used
as supports for heterogeneous catalysts. This kinetic parameter correlates well with the secondorder rate constants for ...
Potent nor-triterpenoid blockers of the voltage-gated potassium channel Kv1.3 from Spachea correae
(1998)
The isolation and structure elucidation of two novel nor-triterpenoid KV1.3 potassium channel blockers correolide and dehydrocorreolide from the Costa Rican tree Spachea correae are reported.
The first potent and selective ...
La estructura de la Diacetonafenantrenoquinona
(1971)
The substance, diacetonephenanthrenequinone, long believed to have structure I or II, is found to have structure IV according to modern spectroscopic methods and chemical behavior.
Bis(μ2-benzoato-κ2O,O′)bis(benzoato-κO)bis(ethanol-κO)bis(μ3-hydroxido)hexakis(μ-pyrazolato-κ2N,N′)hexacopper(II) ethanol disolvate
(2019)
Trinuclear copper–pyrazolate entities are present in various Cu-based enzymes and nanojar supramolecular arrangements. The reaction of copper(II) chloride with pyrazole (pzH) and sodium benzoate (benzNa) assisted by ...
Nueva síntesis de la feromona sexual de la polilla del repollo Plutella Xylostella
(2007)
El compuesto (Z)-11-hexadecenal, feromona sexual de la polilla Plutella xylostella, fue preparado mediante tres secuencias sintéticas. La primer secuencia consistió de siete pasos y un rendimiento total de 47%. En las otras ...
Fotorreducción de dióxido de carbono usando TiO2 sensibilizado con trímeros de Co y Cu en medio acuoso
Carbon dioxide photoreduction using TiO2 sensitized with Co and Cu trimers in aqueous media
Fotorredução de dióxido de carbono usando TiO2 sensibilizado com trímeros de Co e Cu em meio aquoso
(2021-01-31)
En la presente investigación, se evaluó el desempeño de dos fotocatalizadores de dióxido de titanio, uno sensibilizado con un trímero de cobre (Cu3(dpa)4Cl2) (dpa = 2,2 ́-dipiridilamina) y el otro con un trímero de cobalto ...
Grids III: Hydrogen Bridges in Introductory Chemistry
Cuadrículas III: Puentes de Hidrógeno en Química General
(2021)
Based on IUPAC recommendations for the
definition of the hydrogen bond, a series of
grids is presented to provide instructors of
introductory chemistry courses with visual
examples of H-bridged systems. The grids ...