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.
monochrome piano image by Paul Moore from Fotolia.com. Ragtime originated in African American culture and is a musical genre characterized by march and waltz musical influences alongside uptempo syncopated rhythms.agtime first became popular in dance halls in the 1890s, while revivals in the 1940s, 1950s and 1970s have ensured its place in history as a major musical movement. Ragtime had an impact in popular American culture, with the renowned composer Scott Joplin becoming a household name.