Usher Raymond's ex-wife Tameka Foster finally drops his surname. Nearly seven years after their divorce became official Usher Raymond's ex-wife Tameka has dropped his surname. The stylist and reality star appears to have cut ties with the r'n'b star by reverting back to her maiden name on social media.
Paricutin is a cinder cone volcano in Michoacan, MichoacÃ¡n. Mexico paricutin was named one of the seven natural wonders as an active. volcano
Summary. 1  The nuclear enzymes topoisomerase I and II are critical for DNA function and cell survival, and recent studies have identified these enzymes as cellular targets for several clinically active anticancer drugs. Topoisomerase II inhibitors (anthracyclines, epipodophyllotoxins, etc.) are active against several types of tumours. However, treatment with these drugs often results in the development of the multi-drug resistance.