Colorimetric gas detectors have been widely applied in many fields such as environmental sciences, industrial hygiene, process control, forensic science and indoor air quality monitoring. They a history of about 100 years include devices detector tubes paper-based detectors. The sensitivity selectivity the colorimetric are relatively high compared to other types semiconductor, catalytic combust...

Colorimetric data can be readily computed from measured spectral data, however, as illustrated by metameric pairs, the mapping from spectral data to colorimetric values is many-to-one and therefore typically not invertible. In this paper, we investigate inversions of the spectrum-to-colorimetry mapping when the input is constrained to a single color reproduction medium. Under this constraint, a...

The emergence of multidrug-resistant tuberculosis calls for new, rapid drug susceptibility tests. We have tested 150 Mycobacterium tuberculosis isolates against the second-line drugs ethionamide, kanamycin, capreomycin, ofloxacin, and para-aminosalicylic acid by the colorimetric resazurin microtiter assay and the proportion method. By visual reading, MICs were obtained after 8 days. A very good...

"Naked eye" color detection of proteins was achieved by embedding calixarene receptors within vesicles comprising phospholipids and the chromatic polymer polydiacetylene. Dramatic visible absorbance changes were induced through electrostatic interactions between the protein surface and the vesicle-incorporated hosts. The colorimetric responses could be induced by micromolar protein concentratio...

In 1923, Sharlit and Seheer (1) published a paper entitled "The Hydrogen-Ion Concentration of the Healthy, Intact Skin," in which they discussed in detail the meaning of hydrogen-ion concentration and pH, and showed how the entire concept of hydrogen-ion concentration is a part of the general theory of electrolytic dissociation. They stated that the only method available at that time for measur...

Fluoride is beneficial to human health in small quantities; it plays vital roles in preventing dental decay and in treating osteoporosis. In contrast, excess fluoride consumption can cause dental fluorosis or mottled enamel and skeletal fluorosis, a bone disease that is a major problem in India. It has been reported that an excess of fluoride can cause the inhibition of over 100 different enzym...

The discovery of the DNA-mediated assembly of gold nanoparticles was a great moment in the history of science; this understanding and chemical control enabled the rational design of functional nanomaterials as novel probes in biodetection. In contrast with conventional probes such as organic dyes, gold nanoparticles exhibit high photostability and unique size-dependent optical properties. Becau...

Aim of study: The objective this work was to evaluate the potential colorimetry discriminate wood from “louros” group, in particular contribute a database Brazilian native species for future application logging control actions. Area wooden discs were collected Sustainable Forest Management (AMFS) belonging two extractivist communities, Paraiso and Arimum, both “Green Forever” Extractivist Reser...