Linked Life Data

4429771

Source:http://linkedlifedata.com/resource/pubmed/id/4429771

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
12
pubmed:dateCreated
1975-2-18
pubmed:abstractText
Hemoglobin is examined as a model system for intrinsic photoelectron labeling experiments. The absolute photoelectron quantum yields of hemin, hemoglobin, and apohemoglobin thin films were measured in the 180-230 nm wavelength region. Hemin exhibits a quantum yield of approximately 6 x 10(-4) electrons per incident photon at 180 nm, 9 x 10(-5) electrons per incident photon at 210 nm, and 2 x 10(-6) electrons per incident photon at 230 nm. At all wavelengths the hemin curve lies approximately a factor of 20 above that of hemoglobin and two orders of magnitude above that of apohemoglobin. High image contrast is observed between hemin and apohemoglobin in low magnification photoelectron micrographs, suggesting the feasibility of intrinsic labeling studies involving heme proteins. The quantum yield of hemoglobin is discussed in terms of linear contributions from heme groups and protein weighted by their relative surface areas. The fractional surface areas based on the known structure of hemoglobin are consistent with values derived from the quantum yields of hemin and apohemoglobin.
pubmed:commentsCorrections
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Dec
pubmed:issn
0006-3495
pubmed:author
pubmed:issnType
Print
pubmed:volume
14
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
933-9
pubmed:dateRevised
2009-11-18
pubmed:meshHeading
pubmed:year
1974
pubmed:articleTitle
Photoelectron quantum yields of hemin, hemoglobin, and apohemoglobin. Possible applications to photoelectron microscopy of heme proteins in biological membranes.
pubmed:publicationType
Journal Article