Results: 27

New production process of the antifungal chaetoglobosin A using cornstalks

Braz. j. microbiol; 48 (3), 2017
Abstract Chaetoglobosin A is an antibacterial compound produced by Chaetomium globosum, with potential application as a biopesticide and cancer treatment drug. The aim of this study was to evaluate the feasibility of utilizing cornstalks to produce chaetoglobosin A by C. globosum W7 in solid-batch fermen...

Special metabolites isolated from Urochloa humidicola (Poaceae)

An. acad. bras. ciênc; 89 (2), 2017
ABSTRACT This study aims to identify special metabolites in polar extracts from Urochloa humidicola (synonym Brachiaria humidicola) that have allelopathic effects and induce secondary photosensitization in ruminants. The compounds were isolated and identified via chromatographic and spectroscopic techniq...

7-epi-griffonilide, a new lactone from Bauhinia pentandra: complete 1H and 13C chemical shift assignments

An. acad. bras. ciênc; 89 (1), 2017
ABSTRACT A new lactone, 7-epi-griffonilide (1), and six known compounds, 2, 3a - 3c, 4a and 4b, were isolated from the leaves of Bauhinia pentandra (Fabaceae). The structures elucidation of 1 and 2 were based on detailed 2D NMR techniques and spectral comparison with related compounds, leading to complet...

Characterization and bioactivities of a novel polysaccharide obtained from Gracilariopsis lemaneiformis

An. acad. bras. ciênc; 89 (1), 2017
ABSTRACT Gracilariopsis lemaneiformis is a type of red alga that contains seaweed polysaccharide agar. In this study, a novel non-agar seaweed polysaccharide fraction named GCP (short of crude polysaccharide obtained from Gracilariopsis lemaneiformis) was isolated from Gracilariopsis lemaneiformis. Struc...

Two novel Co(II) complexes with two different Schiff bases: inhibiting growth of human skin cancer cells

Braz. j. med. biol. res; 50 (7), 2017
Using two flexible Schiff bases, H2L1 and H2L2, two new cobalt II (Co(II))-coordination compounds, namely, Py3CoL1 (1) and Py3CoL2 (2) (Py=pyridine, L1=3,5-ClC6H2(O)C=NC6H3(O)-4-NO2, L2=3,5-BrC6H2(O)C=NC6H3(O)-4-NO2) have been synthesized under solvothermal conditions. Single crystal X-ray structural ana...

Efecto citotóxico de los compuestos de inclusión de paladio (II) en la beta-ciclodextrina

Biomédica (Bogotá); 36 (4), 2016
Resumen Introducción. Las tiosemicarbazonas y sus complejos de paladio (II) poseen actividad antineoplásica con pocos efectos secundarios, por lo cual se las considera como una nueva alternativa terapéutica. Sin embargo, existen diferencias en los rangos de la concentración inhibitoria media (CI50) ...

Teoría Prión - Enfermedades Priónicas

Acta neurol. colomb; 31 (1), 2015
Un enorme progreso se ha logrado en la identificación, prevención, control y estudio de las enfermedades priónicas. El objetivo de esta actualización es presentar un breve Resumen de la historia de la Teoría Prión, de la participación nacional en relación con la salud humana y animal, así como a...

Enfermedades Autoinflamatorias

Rev. colomb. reumatol; 17 (2), 2010
Presentamos un artículo de revisión sobre las enfermedades autoinflamatorias, narrando su origen histórico y describiendo la estructura proteica y molecular del Inflamosoma, la clasificación actual de los trastornos autoinflamatorios y una descripción de las características inmunogenéticas y clín...

Frecuencia del alelo causante de la enfermedad de Charcot-Marie-Tooth (tipo axonal con herencia autosómica recesiva) en Palmares, Costa Rica

Rev. biol. trop; 57 (supl.1), 2009
Frecuency of the allele causing the axonal form of autosomal recessive Charcot-Marie-Tooth in Palmares, Costa Rica. The Charcot-Marie-Tooth disease constitutes is among the most frequent hereditary peripheral neuropathies world-wide. We identified a family from Palmares (Alajuela, Costa Rica) with 18 aff...

Sobre as proteínas tirosina-fosfatases. Reatividade intrínseca de ésteres de fosfato e simulação computacional dos mecanismos de reação enzimática

Proteínas tirosina-fosfatases (PTPs) catalisam a hidrólise de fosfotirosina de outras proteínas e, assim, regulam importantes processos bioquímicos. Dois representantes desta família são as fosfatases de dupla especificidade VHR e CDC25B. A primeira etapa de reação catalisada é um ataque nucleof...