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a photometer for comparing two light radiations wavelength by wavelength

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After leaving at room temperature for 10 min, then, the color developed was spectrophotometrically measured at 450 nm.
The number of amplicon copies in each extract was determined spectrophotometrically (BioMate 5 UV-visible spectrophotometer, Thermo Spectronic).
Absorbance of the resulting solution was measured spectrophotometrically at 517nm.
The total phenolic content of the extracts was determined spectrophotometrically (Jasco V-530, USA) according to the Price and Butler method [39].
DNA was extracted from a portion of lymphocytes as described earlier (17) and the concentration and purity of DNA estimated spectrophotometrically.
The reduction of DCIP can be followed spectrophotometrically at 600 run.
For the wash fastness testing the concentration of "UV-absorber 1" on the fabric is determined spectrophotometrically from the relationship k/s derived by Kubelka/Munk.
Base, middle, and tip sections of plant leaves will be spectrophotometrically assayed in-order to quantify phenolic concentrations.
3 (h) 0 >45 (a) Plasmid DNA p88-D-21 was quantitated spectrophotometrically, and dilutions containing the indicated copy number of target sequence were added to each polymerase chain reaction (PCR) assay.
1] activity was measured spectrophotometrically at 25 [degrees] C in 1 mL of reaction medium containing 30 mM MOPS, 50 [micro]M cyt c, 1 mM SHAM, 1 mM KCN, and was initiated with 1 mM reduced duroquinone.
An active enzyme then converts nicotinamide adenine dinucleotide (NAD) to NADH, resulting in an absorbance change that can be measured spectrophotometrically.
280]) of both catalase and [Alpha]-crystallin solutions were determined spectrophotometrically.
After left standing for an additional 30 min, the concentration of picrate/ dichromate ion remaining in the aqueous phase was measured spectrophotometrically.
TOS and TAS were analysed spectrophotometrically by reading at 530 nm and 660 nm, respectively.