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Tompkins-McCaw Library is sponsoring a presentation entitled "GIS and Public Health Data: Towards a Better Understanding of the Magnitude of U.S. Public Health Disparities," by Dr. Charles Croner, Geographer and Survey Statistician, CDC, next Wednesday (6/8/06), 10 - 12 noon. This event is open to the public, registration required.
NIH Radio presents recent research findings in a journalistic-news, podcast-ready format. The podcast archive started this past March, and there are currently two episodes a month. The online NIH Radio archive (downloadable mp3 files) began in May 2005.
(for NIH podcasts)
There are several types of reaction mechanisms in organic chemistry (SN1, SN2, E1, E2, rearrangements, etc.) A very common assignment in organic chemistry courses is writing reaction mechanisms. Successfull completion of the assignment involves correctly representing the movement of electron pairs using curved arrows. This in turn is built on many foundational concepts (carbocations and carbanions, Lewis structures, Lewis acid-base concepts, formal charge, resonance structures, molecular orbitals, electronegativity, etc.).
Some helpful interactive tutorials for this material (including quizzes to test your knowledge) are available online:
Curly Arrows: An Interactive Tutorial in the Writing of Organic Reaction Mechanisms (Dr. Mary Masson, Dept. of Chemistry, University of Aberdeen): covers substitution, elimination and rearrangement reactions.
Two selections from the Online Virtual Chemistry Laboratory (Dr. K.N. Harrison's research group, Dept. of Chemistry, Oxford University):
Interactive Organic Mechanisms: covers SN1, SN2, E1, E2.
Named Organic Reactions: covers more than 50 reaction mechanisms.