We therefore assume that the measurement error in measuring the ratio of fluorescences has a Gaussian distribution.
Linearity of the mass spectrometry measurements was determined with endocannabinoid standards by measuring the ratio of their accumulated (8000 laser smartbeam shots) area spectra over the corresponding internal deuterated standard one.
Total amount of RNA was quantified by optical density (OD) measurements using a ND-1000 Nanodrop Spectrophotometer (Thermo Scientific) and the purity was evaluated by measuring the ratio of OD at 260 and 280 nm.
Potassium-argon dating, method of determining the time of origin of rocks by measuring the ratio of radioactive argon to radioactive potassium in the rock.
In 1905 he proposed that lead is the final decay product of uranium and two years later developed a method of determining the age of some rocks by measuring the ratio of lead and uranium.
The researchers dated the fossils by measuring the ratio of uranium to its decay product lead, which allows them to estimate their age quite accurately, geologically speaking: within six million years.
Another may actually be convicting the innocent.The test usually employed for testosterone abuse relies on measuring the ratio of two chemicals found in the urine: testosterone glucuronide (TG) and epitestosterone glucuronide (EG).
Precise and accurate information as to the number of atoms in the sample can, however, be obtained by measuring the ratio of the number of atoms in the various separated beams.
By adding a special artificially enriched isotope during sample dissolution and by measuring the ratio of natural to enriched isotopes in adjacent beams, the number of daughter isotopes can be readily determined.
Hence, we can monitor the oxidation of Cys by measuring the ratio of the intensities of peaks S1 and S3.
By measuring the ratio of thorium-230 and uranium-238, daters can estimate how long ago the calcite was laid down.
