Croatia has given the world some renowned scientists. Among the first are two Nobel prize winners. Dr. Vladimir Prelog received the Nobel prize for chemistry in 1975 for the synthesis of organic structures. Dr. Prelog was a professor of organic chemistry at the Technical Faculty in Zagreb. He founded a specially equipped laboratory in the Kastel pharmaceutical plant (today's Pliva) as well as assuming control over the company's projects. Pliva's scientists have continued to follow in the footsteps of Vladimir Prelog in the analysis of wide spectre antibiotics. Leopold Lavaslav Ruzicka (1887-1978) received the Nobel prize for chemistry, or more precisely for the synthesis of hormones in 1939. Both men became honorary members of the Croatian Academy of Arts and Sciences. The Ruder Boskovic Institute with its fifty laboratories deals in the most complex research. This was made possible by the cyclotron, a machine which accelerates the particles of the atom which in turn resulted in research on nuclear analysis and microanalysis, as well as laser and atomic research. On the grounds of the Institute, there is a monument to Ruder Boskovic (1711-1787), a physicist who was the founder of dynamic atomic research where the atom is the centre of force. A monument to Nikola Tesla is also found on these grounds. He was behind ground breaking inventions in the field of electricity and radio technology. The Institute for Physics is also well known for its many scientific contributions. It was relocated recently to a modern building in an area where an entire campus is springing up. The Institute for Immunology is distinguished in the world for its attainments in the scientific field, especially in the areas of immunology, immuno-chemistry, the processing of human plasma, and immuno-diagnostic preparations. We could go on quite a while like this as there are at least another fifty institutes in Zagreb.