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 do tickets stay on my driving record? Tickets remain on your record for a minimum of seven years, depending on the type of license and the type of ticket(s) received. Alcohol and controlled substances related driving convictions remain on your record for life. If you did not find the information you need, enter a descriptive word or phrase in the Search field located in the upper right corner or send us an e-mail and we will help you get the information you need.