o-Phenylenediamine Free Base is a peroxidase substrate suitable for use in ELISA procedures. The substrate produces a soluble end product that is orange-brown in color and can be read spectrophotometrically at 450 nm. The OPD reaction may be stopped with 3 N HCl or 3 M H 2 SO 4 and read at 492 nm.
If a person is issued a ticket for an accident in Minnesota, it  will stay on his or her driving record for five years. However, if  the accident was alcohol related, depend â¦ ing on the charge, it can  stay longer. 1 person found this useful.
How long will traffic ticket points stay on my record? State law does not permit the Secretary of State to prematurely remove points from a driving record, nor is it possible to have a conviction for a traffic offense set aside. As a consequence, the points for any traffic ticket conviction will remain on your record for two years from the date of the conviction. This is why it is so important to fight every single ticket you receive, rather than waiting until you get a ticket which will push you over the 12-point limit.