ABSTRACT
The U.S. Federal Communications Commission is responsible for regulation in the communications marketplace and for management of the nation's non-federal radio frequency spectrum. During the past year, FCC economists helped develop efficient mechanisms for making available more flexible-use spectrum for the deployment of advanced broadband technologies; developed two new universal service funding mechanisms that aim to close the digital broadband divide; and, through careful analysis of firm cost data, contributed to a renewed effort by the Commission to develop price caps for interstate calls on prison inmate calling services. FCC economists also contributed to the Commission's extensive response to COVID-19.
ABSTRACT
A high-performance size-exclusion chromatography-evaporative light scattering detector method was used to separate, detect and quantify galacturonic acid (GA) oligomers. In 40 mM acetic acid GA monomer, dimer and trimer could be separated with baseline resolution but polygalacturonic acid (PGA) precipitated and could not be eluted from the column. An NH4OAc, pH 3.7, buffer was developed as the eluent which separated GA oligomers as well as PGA and pectin without precipitation. Linear calibration curves for mono-, di- and tri-GA were produced with this buffer which could be used to estimate masses of tetra-, penta- and hexa-GA, as well as 19mer and 20mer.
