Fossil data shed light on a debate about when vertebrate dental tissues arose by assigning an early sensory structure to arthropods rather than to vertebrates. Philippe Janvier is at the Centre ...

Save guides, add subjects and pick up where you left off with your BBC account. Multiple choice questions appear throughout both exam papers, and at both foundation tier and higher tier. Multiple ...

Hubei Key Laboratory of Biomass Fibers and Eco-dyeing & Finishing, College of Chemistry and Chemical Engineering, Wuhan Textile University, Wuhan 430200, P. R. China Hubei Key Laboratory of Biomass ...

† School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States ‡ School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, ...

This might be explained in terms of resonance structures of the anisole molecule ... forming a cation radical which decompose to the carbocation.