Serum myoglobin test has, for the most part, been replaced by the troponin level test to provide a positive diagnosis of a heart attack. This is because troponin levels are more specific to heart damage than myoglobin levels.erum myoglobin test has, for the most part, been replaced by the troponin level test to provide a positive diagnosis of a heart attack. This is because troponin levels are more specific to heart damage than myoglobin levels.
The siRNA sequence is modified to introduce a short loop between the two strands. The resulting transcript is a short hairpin RNA (shRNA), which can be processed into a functional siRNA by Dicer in its usual fashion..
Jun 18, 2013, 5:28 PM. Active styli can hover over the screen and you will see a cursor on screen. If you have ever used a wacom, this is active. The styli will also typically have a writing end and an erasing end. Passive will only work when actually touching the screen.