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David A. Evans (January 11, 1941 – April 29, 2022) [1] [2] [3] was an American chemist who was the Abbott and James Lawrence professor of chemistry at Harvard University. [4] [5] He was a prominent figure in the field of organic chemistry and his research focused on synthetic chemistry and total synthesis, particularly of large biologically active molecules.
Abbot's Kitchen chemistry laboratory in Oxford Detail of a wood engraving by W. E. Hodgkin of 1855 showing the Abbot's Kitchen. The Abbot's Kitchen in Oxford, England, is an early chemistry laboratory based on the Abbot's Kitchen at Glastonbury Abbey, a mediaeval 14th-century octagonal building that served as the kitchen at the abbey.
In chemistry and biochemistry, the Henderson–Hasselbalch equation = + ([] []) relates the pH of a chemical solution of a weak acid to the numerical value of the acid dissociation constant, K a, of acid and the ratio of the concentrations, [] [] of the acid and its conjugate base in an equilibrium.
Quantity (common name/s) (Common) symbol/s Defining equation SI unit Dimension General heat/thermal capacity C = / J⋅K −1: ML 2 T −2 Θ −1: Heat capacity (isobaric)
The calculation of the excluded volume for particles with non-spherical shapes is usually difficult, since it depends on the relative orientation of the particles. The distance of closest approach of hard ellipses and their excluded area has been recently considered.
Clair Cameron Patterson (June 2, 1922 – December 5, 1995) [1] was an American geochemist.Born in Mitchellville, Iowa, Patterson graduated from Grinnell College.He later received his Ph.D. from the University of Chicago and spent his entire professional career at the California Institute of Technology (Caltech).
Ira N. Levine (February 12, 1937 – December 17, 2015) was an American author, scientist, professor and faculty member in the chemistry department at Brooklyn College.He widely acknowledged for his research in the field of microwave spectroscopy, and for several widely known textbooks in physical chemistry and quantum chemistry.
Helen Cecilia De Silver Abbott Michael (December 23, 1857 – November 29, 1904) was an American chemist and a pioneer in phytochemistry. She documented the relationship between chemical composition and plant morphology and proposed a chemical taxonomy for plants.