Signs of the hyperfine interaction constants and spin densities in nitric oxide radicals

The relation between the fluorine hyperfine splittings in about 20 fluorine substituted aromatic radicals and the π spin densities calculated according to McLachlans method is analysed with an expression of the type aF = QFFF ρπFF + QFCC ρπCC + (QFFC + QFFC) ρπFC . For the Q factors the following values are obtained: QFFF =931 gauss; QFCC =86.6 gauss and (QFFC + QFFC) =345 gauss. Two simpler expressions with one and two parameters respectively are also tested. A theoretical estimate is made for the values of the Q factors and the results are compared with the values obtained semi-empirically.

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ENDOR-Untersuchungen am metastabilen Triplett-Zustand des Naphthalin-Moleküls

Zeitschrift für Naturforschung A ◽

10.1515/zna-1968-1106 ◽

1968 ◽

Vol 23 (11) ◽

pp. 1740-1746

Author(s):

P. Ehret ◽

H. C. Wolf

Keyword(s):

Hyperfine Interaction ◽

Triplet State ◽

Excited Triplet State ◽

Excited Triplet ◽

Hyperfine Tensor ◽

Doublet Splitting ◽

Spin Densities

ENDOR-measurements of the photo-excited triplet state of naphthalene, 1-monodeutero-naphthalene and 1,4-dideutero-naphthalene in durene at 4.2°K are reported. The hyperfine interaction constants of α- and β-protons and α-deuterons, the corresponding spin densities and the axis of the hyperfine tensor are determined. A doublet splitting of all ENDOR lines indicates the existence of four (instead of two) inequivalent sites for naphthalene molecules in the durene matrix.

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Localization of endothelial nitric oxide synthase in the normal and failing human atrial myocardium

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100166397 ◽

1996 ◽

Vol 54 ◽

pp. 786-787

Author(s):

Chi-Ming Wei ◽

Margarita Bracamonte ◽

Shi-Wen Jiang ◽

Richard C. Daly ◽

Christopher G.A. McGregor ◽

...

Keyword(s):

Nitric Oxide ◽

Heart Failure ◽

Nitric Oxide Synthase ◽

Endothelial Nitric Oxide Synthase ◽

Cardiac Tissues ◽

Mammalian Tissues ◽

End Stage Heart Failure ◽

End Stage ◽

Oxide Synthase ◽

Endothelial Nitric Oxide

Nitric oxide (NO) is a potent endothelium-derived relaxing factor which also may modulate cardiomyocyte inotropism and growth via increasing cGMP. While endothelial nitric oxide synthase (eNOS) isoforms have been detected in non-human mammalian tissues, expression and localization of eNOS in the normal and failing human myocardium are poorly defined. Therefore, the present study was designed to investigate eNOS in human cardiac tissues in the presence and absence of congestive heart failure (CHF).Normal and failing atrial tissue were obtained from six cardiac donors and six end-stage heart failure patients undergoing primary cardiac transplantation. ENOS protein expression and localization was investigated utilizing Western blot analysis and immunohistochemical staining with the polyclonal rabbit antibody to eNOS (Transduction Laboratories, Lexington, Kentucky).

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