Beijing.

The article presents Beijing, China's contribution to the Nature Index based on weighted fractional count of scientific articles published in 2013, with Peking University and Tsinghua University as the city's largest contributing institutions. Peking's research outputs include conjugated polymers for transistors and asymmetric synthesis to develop drug molecules. Tsinghua's papers include topics on bimetallic nanocatalysts, supramolecules, and graphene synthesis using sodium-ammonia solution.