Actinic keratoses that develop on the lips are referred to as actinic cheilitis. The clinical appearance of an actinic keratosis is that of a small (several millimeters), red scaly papule or plaque, with induration and thickening of the epidermis.
1 Location: Ideally, the probe should be in close proximity to the forward or reverse primer, but should not overlap with a primer-binding site on the same strand. 2  Probes can be designed to bind to either strand of the target. 3  Melting temperature (Tm): Preferably, probes should have a Tm 6â8Â°C higher than the primers.
So if youâve got your electrode hooked up to the negative terminal of the welder, (DCEN-DC electrode negative), approximately 2/3rds of the heat will be put into the workpiece. In the early days of welding it was common to designate DCEN as straight polarity, and DCEP as reverse polarity. Just remember: The opposite is true for (DCEP=DC electrode positive), 2/3rds of the heat will be biased towards the electrode. This entry was posted in Basic Information, Electrodes and tagged ac, dc, dcen, dcep, electrode negative, electrode positive, electrodes, reverse polarity, straight polarity, welding. Bookmark the permalink.