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Titolo:
X-RAY-DIFFRACTION FROM A HELIX OF ANY LENGTH THAT DISPLAYS CUMULATIVEAZIMUTHAL DISORDER
Autore:
MU XQ; MAKOWSKI L; FAIRCHILD BM;
Indirizzi:
COLUMBIA UNIV,ST LUKES ROOSEVELT HOSP CTR,DIV HEMATOL,MED SERV NEW YORK NY 10025 COLUMBIA UNIV,ST LUKES ROOSEVELT HOSP CTR,DIV HEMATOL,MED SERV NEW YORK NY 10025 COLUMBIA UNIV,COLL PHYS & SURG,DEPT MED NEW YORK NY 10025 FLORIDA STATE UNIV,INST MOL BIOPHYS TALLAHASSEE FL 32306
Titolo Testata:
Acta crystallographica. Section A, Foundations of crystallography
, volume: 53, anno: 1997,
parte:, 1
pagine: 55 - 62
SICI:
0108-7673(1997)53:<55:XFAHOA>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
SICKLE HEMOGLOBIN FIBERS; RANDOM VARIABLE TWIST; F-ACTIN; SCATTERING;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
19
Recensione:
Indirizzi per estratti:
Citazione:
X.Q. Mu et al., "X-RAY-DIFFRACTION FROM A HELIX OF ANY LENGTH THAT DISPLAYS CUMULATIVEAZIMUTHAL DISORDER", Acta crystallographica. Section A, Foundations of crystallography, 53, 1997, pp. 55-62

Abstract

An explicit formula has been derived to describe the attenuation and broadening of cylindrically averaged diffraction intensities from a helix of any given length which possesses cumulative azimuthal disorder. The application limits of an approximate formula, represented by the first term of this formula, are defined. Strategies to estimate the length of fibers, the degree of disorder, and the overlap of adjacent layer lines are outlined. Some features of diffraction patterns from thedisordered helical structure of the HbS fiber are interpreted in light of these results. In these patterns, non-zero-order Bessel functionsare attenuated and broadened due to azimuthal disorder and finite length. Adjacent layer lines overlap because of the very large axial repeat distance of the HbS fibers. As a result, the contribution of any Bessel function term with n greater than or equal to 10 is not discernible in these patterns. Only Bessel terms with n < 6 may be accurately estimated in these patterns, if instrumental broadening is negligible or correctable. The theory presented here may also be used to make a rough estimate of the degree of disorder in F-actin fibers by comparisonof X-ray diffraction patterns with serial peak projections calculatedassuming various degrees of disorder.

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Documento generato il 01/12/20 alle ore 10:34:37