So, there is little doubt that chemists will want to start from known quantities of pure chemicals.
The concentration of the pre-adenylated adaptor was estimated by analysis on an 15% denaturing polyacrylamide gel (made with American Bioanalytical Sequel NE, #AB13021, AB13022) and comparison of band intensity to known quantities of synthesized oligonucletides.
Positive controls, comprising known quantities of both Bd and Bsal DNA (100, 10, 1 and 0.1 GE – zoospore genomic equivalents) and a negative control were included in each qPCR run.
For each country, the study looked at 18 factors, including known quantities of nuclear materials, physical protections, accounting methods and transportation security as well as larger societal factors like political stability and corruption.
Dry weight determinations of all samples of soil, plants, and vermicompost were done by heating known quantities of samples at 105 °C to constant weights.
For this purpose, known quantities of brimonidine tartrate (0.1, 10, 50 μg/mL) were supplemented to the sample solution previously analyzed.
Different concentrations of HCl acid solutions (1.0, 3.0 and 4.0 M) were prepared by diluting HCl acid solution (10 M, 32 % HCl) with known quantities of distilled water.
All reactions were done in duplicate and relative concentrations values were calculated using a standard curve for known quantities of GAPDH.
The amount of GFP in the unknown samples was then determined from standard curves generated from the known quantities of GFP.
The sensitivity of each RT-PCR primer pair was determined using known quantities of a synthetic calibrant RNA template as described previously[20].
The sensitivity of each RT-PCR primer pair was determined using known quantities of a synthetic calibrant RNA template as described previously [42].
