A New Colorimetric Methods of PCP Determination

on the comparison of keyword and semantic-context methods of learning new vocabulary meaning

the rationale behind the present study is that particular learning strategies produce more effective results when applied together. the present study tried to investigate the efficiency of the semantic-context strategy alone with a technique called, keyword method. to clarify the point, the current study seeked to find answer to the following question: are the keyword and semantic-context metho...

A new and rapid colorimetric determination of acetylcholinesterase activity.

A photometric method for determining acetylcholinesterase activity of tissue extracts, homogenates, cell suspensions, etc., has been described. The enzyme activity is measured by following the increase of yellow color produced from thiocholine when it reacts with dithiobisnitrobenzoate ion. It is based on coupling of these reactions: (enzyme) acetylthiocholine -----+ thiocholine + acetate thioc...

A new simple semimicro method for colorimetric determination of urea.

Colorimetric methods of determination of menthol in air.

Menthol vapours are irritant to eyes, nose and throat, and ingestion of this chemical has been reported by Von Oetingen (1958)1) to cause abdominal pain, vomiting, staggering gait and sopor. The workers exposed to high concentrations of menthol vapours in an industry manufacturing menthol crystalls from the plant extracted mentha oil complained of drowsiness, headache, nausea and vomiting. Till...

Determination of Oseltamivir Quality by Colorimetric and Liquid Chromatographic Methods

We developed a colorimetric and chromatographic assay for oseltamivir to assess the authenticity of Tamiflu (F. Hoffmann-La Roche Ltd., Basel, Switzerland) because of a growing concern about counterfeit oseltamivir. The colorimetric assay is quantitative and relies on an extractable colored ion-pair complex of oseltamivir with Congo red or bromochlorophenol blue. The reverse-phase chromatograph...