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Diagram 300 WOW! Line 22f1fa19c3k35 EDTA Chelate Ligand Ethylenediamine NMR GaAs WOW SETI

July 2, 2016

Diagram 300 WOW! Line 22f1fa19c3k35 EDTA Chelate Ligand Ethylenediamine NMR GaAs WOW SETI

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Math Equation Wow Seti 1977 radio signal alien

Wow SETI 1977 radio signal alien


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Metal-EDTA chelate

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Ethylenediamine ligand, Cu2+ complexes withmethylamine (left) andethylenediamine (right)
The chelate effect

Gibbs free energy, ΔG Role in polymers

Wolfgang Jahnke, Novartis Institutes for Biomedical Research, Switzerland.F1000 Chemical Biology
line-broadening effects

Structures of invisible, excited protein states by relaxation dispersion NMR spectroscopy.
Vallurupalli P, Hansen DF, Kay LE. Proc Natl Acad Sci U S A. 2008 Aug 19; 105(33):11766-71
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Proc Natl Acad Sci U S A. 2008 Aug 19;105(33):11766-71. doi: 10.1073/pnas.0804221105. Epub 2008 Aug 13.
Structures of invisible, excited protein states by relaxation dispersion NMR spectroscopy.
Vallurupalli P1, Hansen DF, Kay LE.
Author information
Molecular function is often predicated on excursions between ground states and higher energy conformers that can play important roles in ligand binding, molecular recognition, enzyme catalysis, and protein folding. The tools of structural biology enable a detailed characterization of ground state structure and dynamics; however, studies of excited state conformations are more difficult because they are of low population and may exist only transiently. Here we describe an approach based on relaxation dispersion NMR spectroscopy in which structures of invisible, excited states are obtained from chemical shifts and residual anisotropic magnetic interactions. To establish the utility of the approach, we studied an exchanging protein (Abp1p SH3 domain)-ligand (Ark1p peptide) system, in which the peptide is added in only small amounts so that the ligand-bound form is invisible. From a collection of (15)N, (1)HN, (13)C(alpha), and (13)CO chemical shifts, along with (1)HN-(15)N, (1)H(alpha)-(13)C(alpha), and (1)HN-(13)CO residual dipolar couplings and (13)CO residual chemical shift anisotropies, all pertaining to the invisible, bound conformer, the structure of the bound state is determined. The structure so obtained is cross-validated by comparison with (1)HN-(15)N residual dipolar couplings recorded in a second alignment medium. The methodology described opens up the possibility for detailed structural studies of invisible protein conformers at a level of detail that has heretofore been restricted to applications involving visible ground states of proteins.

Phys. Rev. B 16, 4743–4745 (1977)
Magnetic-resonance line-broadening effects associated with crystalline imperfections

It is shown that contrary to the usual assumption, the magnetic-resonance line-broadening effects due to mosaiclike structures and crystalline strains from imperfections are not completely separable. We have found that the angular behavior of the line broadening associated with the off-diagonal elements of the strains is the same type as that arising from a mosaiclike structure.

Phys. Rev. B 21, 893–898 (1980)
Correlated ESR and NMR line-broadening effect associated with external-magnetic-field inhomogeneities

Inhomogeneous Line-Broadening Effects in1H Two-Dimensional Four-Pulse ESEEM Spectra of Betaine Phosphite Single Crystals

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The effects of inhomogeneous and homogeneous line broadening on the lineshape in two- and quasi-three-dimensional four-pulse (HYSCORE)1H electron-spin-echo-envelope-modulation spectra in single crystals of betaine phosphite are examined. The inhomogeneous line broadening leads to a ridge-type cross-peak shape in the two-dimensional four-pulse spectra. Whereas the homogeneous linewidth can be directly taken from the cross peaks, spectral simulations are necessary for the determination of the inhomogeneous linewidth. The hyperfine-coupling-parameter distributions of protons in the hydrogen bonds of betaine phosphite single crystals are determined. The observed inhomogeneously broadened cross-peak lineshapes indicate small local random fields in the disordered paraelectric phase of betaine phosphite.

Interdiffusion effects and line broadening of hole intersubb and absorption in complex GaAs/AlGaAs quantum well structures

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