Spectrophotometric standards
نویسندگان
چکیده
منابع مشابه
Spectrophotometric Standards from the Far-uv to the Near- Ir on the White Dwarf Flux Scale
The second generation instruments to be installed in 1997 on the Hubble Space Telescope (HST) require spectrophotometric standard stars for ux calibrations to 1.1 m for the imaging spectrograph (STIS) and to 2.5 m for the infrared camera (NICMOS). Calculated model atmosphere ux distributions from 0.1 to 3 m for four pure hydrogen white dwarfs provide the fundamental basis for a new set of spect...
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The reaction of aluminium(III) with Hydroxynaphtol Blue (HNB) in aqueous media at apparent pH 5.5 results in a red complex that is stable for at least 4 hr. Beer's Law is obeyed up to 1.6 microg/ml of aluminium(III) with an apparent molar absorptivity of 1.66 x 10(4) l.mol(-1). cm(-1) at 569 nm. This paper proposes procedures for aluminium(III) determination by ordinary and first-derivative spe...
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A new assay for 3-hydroxy-3-methylglutaryl CoA reductase (mevalonate: NADP oxidoreductase [acylating CoA] , EC 1.1.1.34) is based upon the measurement of released coenzyme A (SH) during the reduction of 3-hydroxy-3-methylglutaryl CoA to mevalonate. Coenzyme A was measured in the presence of dithiothreitol, required for activity, by reaction with 5,5’-dithiobis(2-nitrobenzoic acid). Sodium arsen...
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The nature of caffeine reveals that it is a bitter white crystalline alkaloid. It is a common ingredient in a variety of drinks (soft and energy drinks) and is also used in combination with various medicines. In order to maintain the optimum level of caffeine, various spectrophotometric methods have been developed. The monitoring of caffeine is very important aspect because of its consumption i...
متن کاملSpectrophotometric Measurement of Transamination
In a previous publication (1) from this laboratory, it was demonstrated that the transamination of amino acids to a-ketoglutaric acid is a reaction of wide scope. Although the data reported in the earlier paper permitted the computation of Q transaminase values, these values were of limited quantitative significance since no attempt was made to study the kinetics of these reaction systems, the ...
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ژورنال
عنوان ژورنال: Journal of Research of the National Bureau of Standards Section A: Physics and Chemistry
سال: 1972
ISSN: 0022-4332
DOI: 10.6028/jres.076a.045