Ginning

X molecular spin orbitals must be different from one another in a way that satisfies the Exclusion Principle. Because the wave function IS written as a determinan t. in torch an gin g two rows of Ihe determinant corresponds to interchanging th e coordin ates of Ihe two electrons. The determinant changes sign according to the antisymmetry requirement. It also changes sign when tw O col-uni n s arc in tcrch an ged th is correspon ds to in Lerch an gin g two spin orbitals. 

If a iTioleciile is rotated by chan gin g th c position of the viewer (left mouse btiLlon rotation) ih en the moleetile s position in ihetnolee-ular eoorditi ale system h as not ch an ged and anolb er con lour plot can be requested without recotn pu tin g the wave ftinetion. fb at is, m any orbitals can he plotted after a sin gle poin t ah initio or setn i-einpirical calculation,. iti y contour map is available without recotn putation of the wave function. 

Chapter 2 describes the results of the first detailed study of Lewis-acid catalysis of a Diels-Alder reaction in water. Substituted 3-phenyl-l-(2-pyridyl)-2-propen-l-one dienophiles (la-gin Scheme 1) were found to coordinate to Co, Cu" and Zn ions in aqueous solution. This process forms... 

Automated ammo acid analysis of peptides containing asparagine (Asn) and glutamine (Gin) residues gives a peak corresponding to ammonia Why" ... 

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