JOSE RODRIGO SIERRA ARENAS - Academia.edu (original) (raw)
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Papers by JOSE RODRIGO SIERRA ARENAS
Proceeding of the …, 2000
Larrea tridentata (creosote bush), shows the ability to uptake chromium(VI) ions from solution. E... more Larrea tridentata (creosote bush), shows the ability to uptake chromium(VI) ions from solution. EPA method 200.3 was followed to digest the plant samples, and flame atomic absorption spectroscopy (FAAS) was used to determine the amount of chromium taken up in different parts of the plant. The amount of chromium found within the roots, stems, and leaves was 57.4 mg/g, 14.2 mg/g, and 19.3 mg/g, respectively, after the creosote bush was exposed to a 520-ppm chromium(VI) solution. In addition to FAAS analysis, X-ray microfluorescence (XRMF) analysis of the plant samples provided in situ documentation of chromium absorption by the various plant parts. X-ray absorption spectroscopy (XAS) elucidated the oxidation state of the chromium as Cr(III) absorbed by the plant: The chromium(VI) absorbed from solution was partially reduced to chromium(III) in the roots. Some chromium(VI) and the reduced chromium(III) were transported through the stems, and finally accumulated as chromium(III) in the leaves of the plant. The metal was bound to oxygencontaining ligands within the plant samples. Scanning electron microscopy confirmed the presence of chromium inside the tissues of the plant. Creosote bush may provide a useful method of removing chromium(VI) from contaminated soils.
Revista Filosofia Uis, 2010
Rev Med Hered, 1998
... Glucosa 74 mg%. Na 135, K 4.66, Cl 102, Hbsag no reactivo, Ana (+) 1/40 patrón homogéneo. Anc... more ... Glucosa 74 mg%. Na 135, K 4.66, Cl 102, Hbsag no reactivo, Ana (+) 1/40 patrón homogéneo. Anca p (+) 1/20. Ecografía abdominal hepatomegalia - ascítis. ... Correspondencia: Dr. César Salinas. Departamento de Patología. ... Av. Honorio Delgado 430. San Martín de Porres. ...
Revista de Indias, 1998
página dedicada a la investigación cientifica pluridisciplinaria de la zona andina de america del... more página dedicada a la investigación cientifica pluridisciplinaria de la zona andina de america del sur (peru, bolivia, colombia y ecuador).
Proceeding of the …, 2000
Larrea tridentata (creosote bush), shows the ability to uptake chromium(VI) ions from solution. E... more Larrea tridentata (creosote bush), shows the ability to uptake chromium(VI) ions from solution. EPA method 200.3 was followed to digest the plant samples, and flame atomic absorption spectroscopy (FAAS) was used to determine the amount of chromium taken up in different parts of the plant. The amount of chromium found within the roots, stems, and leaves was 57.4 mg/g, 14.2 mg/g, and 19.3 mg/g, respectively, after the creosote bush was exposed to a 520-ppm chromium(VI) solution. In addition to FAAS analysis, X-ray microfluorescence (XRMF) analysis of the plant samples provided in situ documentation of chromium absorption by the various plant parts. X-ray absorption spectroscopy (XAS) elucidated the oxidation state of the chromium as Cr(III) absorbed by the plant: The chromium(VI) absorbed from solution was partially reduced to chromium(III) in the roots. Some chromium(VI) and the reduced chromium(III) were transported through the stems, and finally accumulated as chromium(III) in the leaves of the plant. The metal was bound to oxygencontaining ligands within the plant samples. Scanning electron microscopy confirmed the presence of chromium inside the tissues of the plant. Creosote bush may provide a useful method of removing chromium(VI) from contaminated soils.
Revista Filosofia Uis, 2010
Rev Med Hered, 1998
... Glucosa 74 mg%. Na 135, K 4.66, Cl 102, Hbsag no reactivo, Ana (+) 1/40 patrón homogéneo. Anc... more ... Glucosa 74 mg%. Na 135, K 4.66, Cl 102, Hbsag no reactivo, Ana (+) 1/40 patrón homogéneo. Anca p (+) 1/20. Ecografía abdominal hepatomegalia - ascítis. ... Correspondencia: Dr. César Salinas. Departamento de Patología. ... Av. Honorio Delgado 430. San Martín de Porres. ...
Revista de Indias, 1998
página dedicada a la investigación cientifica pluridisciplinaria de la zona andina de america del... more página dedicada a la investigación cientifica pluridisciplinaria de la zona andina de america del sur (peru, bolivia, colombia y ecuador).