to assess the pollution trend of southwest ground water aquifer of tehran by nitrite and nitrate, in february 1999, out of 300 wells within this area, 99 wells were selected according to simple random sampling without replacement, analysed by colorimetric and ultraviolet spectrophotometric screening standard methods, respectively. the conclusion asserted is that with a confidence limit of 95%, ...

This part describes the results obtained in the simulations and experiments reported in the previous sessions of this report. A) Statistical comparison of the principal component analysis in various spaces The cumulative contributions of the eigenvectors in each space are summarized for multiple-of-three numbers of eigenvectors in Tables I to III. Table I. Cumulative contribution of the eigenve...

We report the enhancement of the colorimetric response of horseradish peroxidase (HRP) and alkaline phosphatase (AP) in bioassays by thermally evaporated silver, gold, copper and nickel thin films. In this regard, a model bioassay based on biotin-avidin interactions was employed. Biotin groups and enzymes were introduced to all surfaces using a biotinylated linker molecule and avidin, respectiv...

The aim of this study is to evaluate the concordance between the empirical choice of interdental brushes of different diameters compared to the gold standard, the IAP CURAPROX(©) calibrating colorimetric probe. It is carried out with the aim of facilitating the consensus development of best practices. All the subjects' interproximal spaces were evaluated using the reference technique (colorimet...

©2004, IS&T—The Society for Imaging Science and Technology classified into scalar error diffusion methods and vector error diffusion methods depending on the correlation among the CMY color channels. For scalar error diffusion using CMY separation, only a monochromatic version is processed for each color channel in the color image. Thereafter, the halftoned channels are recombined according to ...

Eighteen commercial beers have been analyzed in both liquid and gas phases using colorimetric sensor arrays made from selected chemically responsive dyes printed on a hydrophobic membrane. Digital imaging of the dye array before and after exposure to the complex analytes in either the liquid phase or the head-gas provides a color change profile as a unique fingerprint for the specific analyte. ...

A COLORIMETRIC method for the determination of glucosamine has recently been described by Zuckerkandl and Messiner-Klebermass [1931]. According to their procedure the test-solution, which should contain between 1 and 4 mg. glucosamine hydrochloride, is evaporated to dryness and treated with a freshly prepared solution of sodium methoxide. The free glucosamine base is then cautiously acetylated ...