Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 1975-1979  (4)
  • 1970-1974  (5)
  • 1
    Electronic Resource
    Electronic Resource
    Genetic control of lysine permeases in Saccharomycopsis lipolytica (1979)
    Springer
    Archives of microbiology 122 (1979), S. 201-205 
    Details
    ISSN: 1432-072X
    Keywords: Amino acid transport ; Yeast genetics ; Multiple drug resistance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In order to obtain strains of Saccharomycopsis lipolytica impaired in the active transport of l-lysine, mutants resistant to a mixture of l-canavanine, l-4-5-transdehydrolysine and l-S-amino ethylcysteine, taken either all three or two by two, were isolated. These compounds were shown previously to be competitive inhibitors of l-lysine uptake. The resistance patterns and excretion capacity of the mutants were established. All mutants behaved as monogenic. Recombination tests indicated that four genes at least were involved. All mutants were impaired in both high and low affinity l-lysine transport systems. Several hypotheses on the functions of these genes are put forward and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00411361
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Une transition métal–isolant dans V0,90Nb0,10O2 due à un appariement local des atomes de vanadium (1974)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 30 (1974), S. 55-60 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: X-ray diffuse scattering from V0.90Nb0.10O2 shows that the metal-to-insulator phase transition which occurs around - 25°C without an overall structural change can be explained by local pairing of the vanadium atoms. This local order, which recalls the low-temperature insulating structure of pure VO2, is two dimensional and occurs in the (110) planes of the average rutile structure with little correlation between successive parallel (110) atomic planes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S056773947400009X
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Etude des phases haute température de NaNb3 et des correlations qui les caracterisent (1974)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 30 (1974), S. 423-430 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: From the study of X-ray diffuse scattering diagrams, it has been shown that the diffuse scattering located along three equivalent reciprocal rods (100) in the cubic phase disappears successively at 641, 575 and 520°C. The interpretation is given in terms of planar local order.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739474000921
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Désordre linéaire dans les cristaux (cas du silicium, du quartz, et des pérovskites ferroélectriques) (1970)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 26 (1970), S. 244-254 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S056773947000061X
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    X-ray diffuse scattering from NaNbO3 as a function of temperature (1971)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 27 (1971), S. 414-420 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A qualitative description of the X-ray diffuse scattering from NaNbO3 single crystals as a function of temperature up to 800°C is given. Two types of distinct diffuse scattering where observed in {100} reciprocal planes and on (100) reciprocal axes. While the diffuse scattering in reciprocal planes shows no critical behaviour at the different phase transitions and can be attributed to a `linear disorder' similar to that suggested earlier for KNbO3, the diffuse scattering on reciprocal axes is critical in the vicinity of the 641°C phase transition. The atomic displacements involved with the linear disorder that persists up to 800°C are attributed to the niobium atoms; the critical planar disorder in the cubic phase is attributed to rotations of oxygen octahedra similar to those suggested for SrTiO3 and KMnF3. Both types of disorder exist in the cubic paraelectric phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739471000950
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Structure de la phase cristalline à température ambiante (20°C) du dérivé bis-p-butylanilino de l'acide téréphtalique (TBBA). II (1977)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 33 (1977), S. 1710-1716 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567740877006931
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Etudes de reactions heterogenes en lit fluidise (1979)
    Springer
    Journal of thermal analysis and calorimetry 15 (1979), S. 379-387 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Résumé La déshydratation du gypse (réaction du typeS→ S′+G oùS′ est un solide non stoechiométrique) est étudiée à l'aide d'un réacteur en lit fluidisé. La forme particuliè re de la courbe isotherme qui traduit, pour le système binaire CaSO4- H2Og, la présence d'un équilibre divariant, permet d'interpréter l'influence de la masse initiale du produit dans le réacteur, du débit de fluidisation et de la température sur cette réaction.
    Abstract: Zusammenfassung Die Dehydratisierung von Gips (eine Reaktion des TypsS→ S′+G, wobeiS′ ein nichtstöchiometrischer Festkörper ist) wurde mit Hilfe eines Fluidbettreaktors untersucht. Die eigenartige Form der Isotherme, welche für das Binärsystem CaSO4- H2Og ein divariantes Gleichgewicht andeutet, gestattet die Deutung des Einflusses der anfänglichen Masse des Produktes im Reaktor, der Leistung der Fiuidisation sowie der Temperatur auf diese Reaktion.
    Notes: Abstract Dehydration of gypsum (which is anS→ S′+G type reaction whereS′ is a nonstoichiometric solid) was investigated by means of a reactor in a fluidized bed. The special shape of the isothermal curves shows that a divariant equilibrium is present in the case of the CaSO4-H2Og system. One can interpret the influence of the amount of starting material in the reactor, and the effects of fluidization and temperature for this type of reaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01903663
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Etudes de reactions heterogenes en lit fluidise (1977)
    Springer
    Journal of thermal analysis and calorimetry 12 (1977), S. 341-349 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Résumé Un réacteur en lit fluidisé a été mis au point pour étudier les décompositions solides. La réaction est suivie par analyse des gaz émis par Chromatographie en phase gazeuse. Cette étude montre l'influence de la température et de la masse initiale de produit sur la déshydratation du sulfate de lithium à une molécule d'eau. Malgré certaines difficultés, nos résultats peuvent être reliés à des études effectuées en lit fixe (ATG).
    Abstract: Zusammenfassung Ein Fluidbettreaktor wurde zur Untersuchung der Zersetzung von Festkörpern eingesetzt. Die Reaktion wird durch Analyse der emittierten Gase mittels Gaschromatographie verfolgt. Diese Untersuchung zeigt den Einfluß der Temperatur und der Anfangsmasse des Produkts auf die Dehydratisierung von Lithiumsulfat mit einem Wassermolekül. Trotz gewisser Schwierigkeiten können die Ergebnisse mit denen von Untersuchungen im fixen Bett (TG) in Verbindung gebracht werden.
    Notes: Abstract A fluidized bed reactor was applied for studying the decomposition of solids. The reaction was followed by analysing the evolved gas with gas chromatography. The investigations showed the effect of temperature and of the initial mass on the dehydration of lithium sulphate monohydrate. In spite of some difficulties the results could be related to those obtained by the fixed bed method, i.e. by thermogravimetry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01909592
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Evidence for ionic clusters in butadiene-methacrylic acid copolymers neutralized with various salts (1974)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 12 (1974), S. 115-130 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Effects of neutralization on butadiene-methacrylic acid copolymers have been studied. In Hycar CTB with 2% acid groups, small-angle x-ray scattering gives evidence of some cation clustering and leads to a value of the mean radius of 5.6 Å for the clusters and a value of the distance between them of 70 Å. When the concentration of salt is increased there is no appreciable change in the distance between clusters or in their size, but their number increases. The structure of clusters has been studied by electron paramagnetic resonance in copolymers neutralized with copper salts. The appearance of a line as in the monohydrated acetate salt permits one to define the structure of clusters consisting of two Cu2+ and four RCOO- ions with two H2O or RCOOH molecules. When the temperature is increased, the signal corresponding to Cu2+-Cu2+ pairs disappears. In high molecular weight butadiene methacrylic acid copolymers with 9% acid groups, we have found the ion pair clusters gathered into larger clusters. In dynamic mechanical properties, a relaxation peak appears at 340°K. We interpret this as due to breaking and possible re-forming of dipolar associations.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1974.180120110
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...