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DNA as the genetic material is a topic of intense interest in the 21st century with the familiar and iconic Watson-Crick double helix having a vital importance for its function. However, there are further complexities beyond the double helix, including supercoiling, knotting and catenation, that are less widely appreciated and understood but which are critical to its function. This book explains these topological aspects of DNA structure in a ...

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The Kentucky State Guard's campaign against the Silent Brigade in 1907-1909 offers lessons for the operational art of civil security and supporting civil law enforcement. The Silent Brigade was a guerrilla army that terrorized western Kentucky in a conflict that came to be known as the Black Patch War. Scholars disagree about whether the Kentucky State Guard was effective in its campaign, or whether other circumstances led to the decline of th...