Search results
Results from the WOW.Com Content Network
In fifth species counterpoint, sometimes called florid counterpoint, the other four species of counterpoint are combined within the added parts. In the example, the first and second bars are second species, the third bar is third species, the fourth and fifth bars are third and embellished fourth species, and the final bar is first species.
Transition state structures can be determined by searching for first-order saddle points on the potential energy surface (PES) of the chemical species of interest. [4] A first-order saddle point is a critical point of index one, that is, a position on the PES corresponding to a minimum in all directions except one.
Determining whether a particular reaction is conrotatory or disrotatory can be accomplished by examining the molecular orbitals of each molecule and through a set of rules. Only two pieces of information are required to determine conrotation or disrotation using the set of rules: how many electrons are in the pi-system and whether the reaction ...
Hammond's postulate (or alternatively the Hammond–Leffler postulate), is a hypothesis in physical organic chemistry which describes the geometric structure of the transition state in an organic chemical reaction. [1] First proposed by George Hammond in 1955, the postulate states that: [2]
In chemistry, initiation is a chemical reaction that triggers one or more secondary reactions. Initiation creates a reactive centre on a molecule which produces a chain reaction. [1] The reactive centre generated by initiation is usually a radical, but can also be cations or anions. [2]
Cambiata, or nota cambiata (Italian for changed note), has a number of different and related meanings in music.Generally it refers to a pattern in a homophonic or polyphonic (and usually contrapuntal) setting of a melody where a note is skipped from (typically by an interval of a third) in one direction (either going up or down in pitch) followed by the note skipped to, and then by motion in ...
Pribula was the first player in the 12-team playoff era to opt into the portal in advance of postseason play, robbing the Nittany Lions of an offensive wild card. The rising junior ran for 242 ...
Counterpoint (Kontrapunkt in the original German) is the second volume of Heinrich Schenker's New Musical Theories and Fantasies (the first is Harmony and the third is Free Composition). It is divided into two "Books", the first published in 1910, and the second in 1922. The subject matter of the work is species counterpoint.