Sport touring motorcycle Sport touring motorcycle A sport touring motorcycle (sometime a "sports-tourer") is a type of motorcycle that combines the performance of a sport bike with the long-distance capabilities and comfort of a touring motorcycle. The first sport-tourer is said to be the fully faired 1977 BMW R100RS. Journalist Peter Egan defines the sport-tourer as a "café racer that doesn't hurt your wrists and a touring bike that doesn't feel like a tank," and identified the R100RS as the first example he owned. Unlike a sport model, a sport touring model will typically have more wind protection with larger fairings and an
Beta-propeller region ideal for anchoring membranes. DNA damage-binding protein 1 has three beta-propellers, in which the connection between two of the propellers is inserted into the third propeller potentially allowing for its unique function. Beta-propeller In structural biology, a beta-propeller is a type of all-β protein architecture characterized by 4 to 8 highly symmetrical blade-shaped beta sheets arranged toroidally around a central axis.Together the beta-sheets form a funnel-like active site. Each beta-sheet typically has four anti-parallel β-strands arranged in the beta-zigzag motif. The strands are twisted so that the first and fourth strands are almost perpendicular to each other. There are