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Digitale Medien

Désordre linéaire dans les cristaux (cas du silicium, du quartz, et des pérovskites ferroélectriques) (1970)

Comès, R. ; Lambert, M. ; Guinier, A.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 26 (1970), S. 244-254

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Details

ISSN: 1600-5724

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik

Notizen: Many crystals produce a diffuse scattering of X-rays which is localized in a series of relplanes. It is shown that the corresponding linear disorder in the crystal may have various origins. In silicon, the scattering is due to thermal vibrations and is well explained by the elastic properties of the crystal. In neutron irradiated quartz the radiation damage is responsible for the major part of the scattering. The case of BaTiO3 and KNbO3 is discussed in detail. A linear disorder is proposed which accounts better for the different distributions of the scattering in the 4 allotropic phases than the alternative explanation of the soft mode. In spite of some neutron inelastic scattering results it is not yet possible to distinguish between static and dynamic disorder.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S056773947000061X

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Digitale Medien

Evidence for the control of a mutation in lysine catabolism by the mating type in Yarrowia lipolytica (1984)

Beckerich, J. M. ; Ceccaldi, B. Colonna ; Lambert, M. ; [weitere]

Springer

Current genetics 8 (1984), S. 531-536

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Details

ISSN: 1432-0983

Schlagwort(e): ROAM mutation ; Yarrowia lipolytica ; Lysine catabolism ; Regulation of lysine pool

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Summary Reversions of a mutation lye 1.5 blocking the first step of the lysine catabolic pathway were isolated. These reversions mapped inside the LYC1 locus. They exhibited an alteration of the regulation of the lysine pool after nitrogen and phosphorus starvation. This phenomenon did not appear in sexual diploids homozygous for the reversion. Diploids homozygous for the mating type were constructed by protoplast fusion. They displayed a pattern similar to that of the haploids. We conclude that the expression of this mutation is under the control of the physiological state of the mating type.