This brief introduces the classification and mechanism of density gradient ultracentrifugation (DGUC) method with rich examples showing the versatility of such an efficient separation technique. It also gives a strict mathematical description and a computational optimization model to predict the best separation parameters for a given colloidal system. The concept of "Lab in a tube" is proposed in the last chapter, which allows the size-property relationship investigation, synthetic optimization and reaction/assembly mechanism exploration etc.

Moving to a new town can be tough. For Jug-a-ro-mack-a-la-lulu-e-quack-a-la-lulu-e-zack-a-la-lulu-o-pippin, hard is putting it mildly. Badgersville may look like a nice town, but some of the people can be mean. With the help of his grandfather and an old pad handed down through his family, can he learn to overcome the Badgersville bullies?