Letters should report particularly significant new findings. The work may be at a preliminary stage. Letters are normally refereed by an appropriate Editor, and proofs are normally checked in the Editorial Office that they are submitted to. Letters should have a summary of no more than 100 words. Up to 10 keywords should be provided.
Accounts provide concise reviews of active areas of research.
They are normally written by scientists who have strong current interests in the areas. They should be succinct and lucid, they can be polemical and they ought to predict future developments. Accounts are normally less than 10,000 words in length, not including figures. Accounts should contain a summary of normally not more than 500 words. Accounts are accompanied by a biography and photograph of the author.