The Five Republics of Central America. By Dana G. Munro. (New York: Oxford University Press. 1918. Pp. 319.)

Jones, Chester Lloyd

doi:10.2307/1945977

Cited by 1 publication

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“…NEXAFS spectra have been proposed for biochemical contrast in X-ray microscopy, toward an ultimate goal of chemical mapping of proteins in cells, protein absorption on surfaces, etc. , However, we believe that the use of amino acid spectra for building block analysis of proteins should be approached with some caution, as the amide linkage in polypeptides is very different from the amine and carboxylic acid groups in amino acids.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen 1s Near-Edge X-ray Absorption Fine Structure Spectroscopy of Amino Acids: Resolving Zwitterionic Effects

Otero

Urquhart

2006

J. Phys. Chem. A

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Considerable variation is observed in the near-edge X-ray absorption fine structure (NEXAFS) spectra of amino acids. To unambiguously characterize the chemical origin of this variation, we have acquired the nitrogen 1s NEXAFS spectra of several amino acids and other model compounds and complemented these experimental measurements with ab initio calculations of isolated molecules and molecular clusters. The systematic differences observed between the zwitterionic and un-ionized forms of amino acids arise directly from the structural difference (-NH2 vs -NH3+), which leads to a change in the degree of Rydberg-valence mixing. Further change arises from quenching of this Rydberg character in the spectra of condensed amino acids. Ab initio calculations are used to explore the degree of Rydberg-valence mixing in the solid state.

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Section: Introductionmentioning

confidence: 99%