Bowden, K., Heilbron, I. M., Jones, E. R. H., and Weedon, C. L., J. Chem. Soc., 39 (1946). Attenburrow, J., Cameron, A. F. B., Chapman, J. H., Evans, R. M., Hems, B ...

They may be the long-sought connection between sunspots and disturbances in the atmosphere of the earth The tetrapyrrole ring, a chemical structure made up of four smaller rings, occurs in the ...