The total phenol content estimated by Folin-Ciocalteau assay and expressed as gallic acid equivalent per gram of dried fraction, was 102.54 +/- 2.10mg phenols per gram dry residue. The flavonoid content, investigated by AlCl3 reagent, was 23.49 +/- 0.90mg flavonoids gram dry residue. The methanol extract has been evaluated for antioxidant (DPPH and TEAC assays)
and cytotoxic (SRB assay) properties. In the DPPH radical scavenging assay, the IC50 was 360 mu gmL(-1). In the total antioxidant activity, Sonidegib calculated by the Trolox equivalent antioxidant activity (TEAC, mgg(-1) of dried fraction), the extract showed a high antioxidant capacity (TEAC value of 0.59 +/- 0.02mgg(-1)). The cytotoxic activity of the extract against a human adenocarcinoma cell line HT-29 presented an IC50=69.47 +/- 4.64 mu gmL(-1).”
“Using scanning tunneling spectroscopy and microscopy, the local density of electronic states was correlated with the topography of Fe on MgO and MgO on Fe. The growth mode of Fe on MgO is by island formation that leads to an electronically inhomogeneous surface. Fe (100) surface states were observed on flat terraces that diminish at the step edges, Selleck LCL161 while bandgaps were observed in some deep trenches that separate the islands. MgO on Fe(100), on the other hand, grows by the simpler layer-by-layer mode. The electronic states evolved as a function of thickness from less than one
to several monolayers. The bulklike MgO behavior with more than 6 V bandgap was found for the thickest films (similar to 1 nm). However, the spectra for very thin MgO depended upon whether it was measured on top of Fe atoms or on the MgO grains. At one monolayer, the measured CT99021 density of states was different from either very thick or very thin MgO, which suggests the possibility of an interfacial layer that is distinct
from the Fe (100) and MgO (100) surfaces. The observed local inhomogeneity may account for the reduced tunneling magnetoresistance of these systems. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3070638]“
“The lichen Pseudocyphellaria coriifolia is a species endemic to southern South America. From the lichen thallus, methyl evernate, tenuiorin and three hopane triterpenoids were isolated and identified as the main lichen constituents. Their trypanocidal effects were screened against epimastigotes of Trypanosoma cruzi. The results of the biological test showed that some hopane terpenoids exhibit antiparasitic properties.”
“We used streptavidin-coated magnetic particles (Dynabeads (R) M-280) for an immunochromatographic test, instead of colloidal gold particles, which was widely used in a conventional technique. The concentration of magnetic particles in a membrane was quantitatively analyzed by using a giant magnetoresistance (GMR) sensor with a sensitivity of 0.17%/Oe.