Encyclopedia of Chemistry

(degenerate) equilibrium between two (except for iso- topic substitution) species that are equivalent. This can be used to disti ...

Joliot-Curie, Irène (1897–1956) FrenchNuclear physicist Irène Curie was born in Paris on September 12, 1897, the daughter of the ...

director of the Institute of Radium. He also continued to oversee the construction of the 160-MeV synchrocy- clotron at the new ...

Kamlet-Taft solvent parameters Parameters of the Kamlet-Taft solvatochromic relationship that measure separately the hydrogen bo ...

tisone and of adrenocorticotropic hormone (ACTH) on rheumatoid arthritis with Philip S. Hench, H. F. Polley, and C. H. Slocumb. ...

matter. For example, an inelastic collision is one in which at least a portion of the kinetic energy of the col- liding particle ...

his study on proteins. In 1910 he received the Nobel Prize in physiology or medicine for his contributions in cell chemistry and ...

conversion—in the presence of oxygen—of substances that are formed by the breakdown of sugars, fats, and protein components to c ...

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labeled compound A compound consisting of radioactively labeled molecules that can be observed as it passes through physical, ch ...

type is positive (Rh-positive) or negative (Rh-nega- tive). If the mother has a negative Rh factor (Rh-nega- tive) and the fathe ...

Langmuir’s discoveries helped shape the establish- ment of modern radio and television broadcasting, safeguarded the lives of so ...

LCAO(linear combination of atomic orbitals) A form of expression in showing molecular orbitals. Written as linear combinations o ...

Leffler’s assumption SeeHAMMOND PRINCIPLE. left-to-right convention Arrangement of the struc- tural formulae of the reactants so ...

Lewis base A molecular entity able to provide a pair of electrons and thus capable of COORDINATIONto a LEWIS ACID, thereby produ ...

of a quencher, and should be called “apparent lifetime” instead. See alsoCHEMICAL RELAXATION; HALF-LIFE; RATE OF REACTION. ligan ...

Cells that contain lignin are fibers, sclerids, vessels, and tracheids. limestone A sedimentary rock composed of more than 50 pe ...

Two or more coordination compounds in which the donor atom of at least one of the ligands is different. Linkage isomers have dif ...

lipoxygenase A nonHEME iron ENZYME that cat- alyzes the INSERTIONof O 2 into polyunsaturated fatty acids to form hydroperoxy DER ...

lowest unoccupied molecular orbital (LUMO) The orbital that can act as the electron acceptor, since it is the innermost (lowest ...