منابع مشابه
Specific photometric determination of 5-hydroxyindoleacetic acid in urine.
Udenfriend ‘s nitrosonaphthol test for 5-hydroxyindoleacetic acid (5-HIAA) is subject to interference by urinary phenolic acids and drug metabolites. Studies in our laboratory have shown that the specificity and sensitivity of the nitrosonaphthol reaction with 5-hydroxyindoles can be greatly enhanced by the addition of 2-mercaptoethanol. This observation serves as the basis of a simple, improve...
متن کامل[Measurement of triiodothyronine in urine].
A radioimmunoassay procedure to measure triiodothyronine (T3) in unextracted urine is described. One hundred microliter of T3 standards or samples were incubated with 100 microliter of T3 antiserum (1:40,000), 100 microliter of tracer 125I-T3 and 700 microliter of 0.05 M borate buffer, pH 8.6. Separation of free from bound antigen was achieved by dextran coated charcoal. The cross-reaction of L...
متن کاملMeasurement of mercury in human urine.
Four methods of determining the concentration of mercury in human urine have been studied. A simple method suitable for general laboratory use is recommended and the requirements for accurate results are defined. The method employs mild oxidation with permanganate and HS(2)O(4) followed by dithizone extraction and measurement of absorbance at 485 nm and 620 nm.No mercury was detected in any of ...
متن کاملThe measurement of thiamine in urine.
The most widely used procedures for the measurement of thiamine in urine are based on the oxidation of the vitamin to thiochrome, which is then extracted into butyl alcohol and measured fluorometrically (1). It has been found possible to omit the butyl alcohol extraction without prejudice to the assay. By utilizing benzenesulfonyl chloride to obtain blank values, as proposed by Urban and Goldma...
متن کاملHigh Dynamic Range Video for Photometric Measurement of Illumination
We describe the design and implementation of a high dynamic range (HDR) imaging system capable of capturing RGB color images with a dynamic range of 10,000,000 : 1 at 25 frames per second. We use a highly programmable camera unit with high throughput A/D conversion, data processing and data output. HDR acquisition is performed by multiple exposures in a continuous rolling shutter progression ov...
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ژورنال
عنوان ژورنال: Journal of Biological Chemistry
سال: 1949
ISSN: 0021-9258
DOI: 10.1016/s0021-9258(19)51268-6