2009 JAN 5 - (VerticalNews.com) -- "The problem of an electron in a quantum well is treated using the new (''mirror'') boundary conditions implying that the particle has a specular reflection from the well's boundaries," scientists in Queretaro, Mexico report.

  "Solutions of the Schrodinger equation are obtained for some particular well's geometries when the variable separation method is applicable. The resemblance between the ''mirror'' and periodic boundary conditions is discussed," wrote Y.V. Vorobiev and colleagues ...read more

  2009 JAN 5 - (VerticalNews.com) -- "Semiconductor quantum dots are a promising class of materials in the labeling of biological systems," scientists writing in the journal Applied Surface Science report.

  "In the present study we show the marking pattern of Trypanosoma cruzi (T. cruzi) live parasites using PEGylated CdS/Cd(OH)(2) fluorescent nanocrystals. The analysis obtained by confocal fluorescence microscopy and transmission electron microscopy indicates that only the endocytic paths of parasites were labeled," wrote C.R. Chaves and colleagues, Federal University ...read more

  2009 JAN 5 - (VerticalNews.com) -- According to a study from Mexico, "In this work we have used the Photoacoustic Spectroscopy ( PAS) to determine in vitro the non-radiative relaxation time (NRRT) of a protoporphyrin IX (PpIX) standard solution and samples of PpIX( 1), PpIX( 2) and PpIX( 3) with Au nanoparticle concentrations of 0.001008, 0.00504 and 0.01008 mmol in 25 mL of water respectively. We have used PpIX disodium salt (DS) solution of 25% HCl. ...read more