IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. Lyman C. Craig (1906-1974) was a ...

Developments in spectroscopic analysis and routine availability of X-ray crystallography have simplified structural elucidation of natural compounds. However, isolating bioactive components of ...

Perception of gravity is essential for animals: most animals possess specific sense organs to detect the direction of the gravitational force. Little is known, however, about the molecular and neural ...

COUNTERCURRENT distribution has been successfully applied to the separation of proteins and similar large molecules in certain water–organic solvent systems 1 and in some two-phase water systems ...

PNAS is the world's most-cited multidisciplinary scientific serial. It publishes high-impact research reports, commentaries, perspectives, reviews, colloquium papers, and actions of the Academy. In ...

PNAS is the world's most-cited multidisciplinary scientific serial. It publishes high-impact research reports, commentaries, perspectives, reviews, colloquium papers, and actions of the Academy. In ...