BioCyc is a collection of 7613 Pathway/Genome Databases (PGDBs), plus software tools for understanding their data. Tier 1 databases have received at least one person-year of literature-based curation, and are the most accurate. EcoCyc and MetaCyc have each received more than 20 person-years of curation.
Tier 2 and Tier 3 databases contain computationally predicted metabolic pathways, predictions as to which genes code for missing enzymes in metabolic pathways, and predicted operons.-From Publisher
Covers 1606 to current. Explores the great issues in American History—issues such as religious freedom in the colonies, Civil War Reconstruction and women’s suffrage. Articles are supplemented by primary source documents, biographies, timelines, images, statistical charts and encyclopedia survey articles.
Supports research focusing on questions such as “Should the right to bear arms be restricted?”; “Do corporations have an obligation to act in a socially responsible manner?”; and "How has foreign intervention affected the situation in the Middle East?” - from Publisher
"Provides a complete overview of our nation’s past that covers the most-studied events, decades, conflicts, wars, political and cultural movements, and people. Comprehensive, contextual, media-rich information is provided on topics ranging from the arrival of Vikings in North America, to the stirrings of the revolution, through to the Civil Rights movement, 9/11, and the War on Terror."