Branch Retinal Artery Occlusion - Pathophysiology. 1  Most commonly, a branch retinal artery occlusion occurs secondary to an embolus. Emboli typically originate within vessels upstream where they dislodge and travel within the circulatory system to ultimately become lodged downstream in a vessel with a smaller lumen.
Ragtime is a musical form or style that is defined as a syncopated melody (usually in 2/4 time) over a regular, march tempo bass line. Improvisation was common but little of that aspect has been preserved.
The Ragtime Nightmare by Tom Turpin (St. Louis, MO: Robt. DeYoung & Co., 1900). Performing Arts Reading Room, Library of Congress. Ragtime, a uniquely American, syncopated musical phenomenon, has been a strong presence in musical composition, entertainment, and scholarship for over a century.