Melvin I. Simon, whose recent contributions have advanced the understanding of communication in both bacterial and animal cells, will give three public lectures at the University of California, Davis, beginning Monday, Nov. 16. Below is a schedule of his lectures, sponsored by the campus Division of Biological Sciences and supported through the endowed Tracy and Ruth Storer Lectureship in the Life Sciences. • "How Bacteria Think," Monday, Nov. 16, 4:10 p.m., in 180 Med Sci Bldg. C. • "Signal Transduction in Complex Cellular Systems," Wednesday, Nov. 18, 4:10 p.m., in 180 Med Sci Bldg. C. • "The Design of Biological Information Processing Systems," Thursday, Nov. 19, 4:10 p.m., in 180 Med Sci Bldg. C. A biology professor at the California Institute of Technology, Simon has been focusing on how the parts of a certain protein, known as G protein, transmit signals from cell surface receptors, which results in changes in intracellular metabolism. G proteins are central to the visual, gustatory, olfactory and nervous systems in complex organisms. He is also known for his work on the mechanism of site-specific recombination in bacteria and on the mechanism of bacterial movement and chemotaxis. Established in 1960, the Tracy and Ruth Storer Lectureship in the Life Sciences brings eminent biologists from other institutions to participate in the UC Davis academic community.