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  • Articles  (60)
  • 2020-2024  (3)
  • 1985-1989  (23)
  • 1980-1984  (13)
  • 1970-1974  (5)
  • 1965-1969  (16)
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  • 1
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 90 (1968), S. 6071-6077 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 90 (1968), S. 6077-6082 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 113 (1982), S. 1079-1085 
    ISSN: 1434-4475
    Keywords: Aluminium ; Crystal Structure ; Iron ; Oxygen ; Rare Earth
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract New compounds of magnetoplumbite structure with rare earth-ions were prepared by solid state reactions and determined by X-ray single crystal work. They crystallize in space group D 6h 4 -P63/mmc withA:a=582.6,c=2283;B:a=563.4,c=2208;C:a=565.8,c=2218 pm. The distribution of Fe and Al to the metal positions were determined and the thermal ellipsoids of the metal positions are discussed.
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  • 5
    ISSN: 1359-5997
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract A procedure to estimate the failure probabilities of reinforced concrete (R/C) chimneys under severe wind loading which allows for considering realistic correlation values of concrete strength is developed. The results show that the assumption of full correlation of concrete strength within cross-sections, as suggested for example in present codes, may significantly overestimate the failure rates in present examples by two orders of magnitude. However, it is also shown that not only one but a number of cross-sections may contribute to the total failure rate of R/C chimneys. As a consequence, the failure estimates increase, in some cases by as much as two orders of magnitude. In the numerical examples as investigated here these counteracting effects neutralize each other. This fact, however, should not be generalized.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    International journal of infrared and millimeter waves 6 (1985), S. 459-470 
    ISSN: 1572-9559
    Keywords: high-power millimeter waves ; gyrotron ; electron cyclotron resonance heating (ECRH) ; overmoded waveguide systems ; mode conversion ; linearly polarized narrow pencil beam
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This work reports calculations and measurements on mode converters for the transformation of TEOn gyrotron mode mixtures (primarily TEO2) into the linearly polarized HE11 hybrid mode at 70 GHz. This mode is ideal for quasi-optical launching systems for ECRH of plasmas. Mode transducers with axisymmetric radius perturbations convert the gyrotron TEOn mode composition into the TEO1 mode. Proper matching of the phase differences between the various modes and of the perturbation amplitudes of the several converter sections is required. The TEO1 wave is used for long-distance transmission through smooth-walled overmoded waveguides. A mode converter with constant diameter and periodically perturbed curvature transfers the unpolarized TEO1 mode into the polarized TE11 wave. The experimentally determined ΣTEOn-to-TEO1 conversion efficiency is (98.5±1)% (99% predicted) while the TEO1-to-TE11 transformer has a (94±2)% efficiency (93% theoretically); ohmic losses are included. The “Gaussian-like” HE11 mode with axisymmetric power distribution and almost no cross polarization is produced in a circumferentially corrugated TE11-to-HE11 mode transducer with a measured conversion efficiency of (98.3±1.5)% (98.5% predicted). The overall efficiency of the complete mode converter system in the desired mode was determined to be (91±2.5)%. High-power operation (200kW, 100ms) has been successfully demonstrated.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Plant foods for human nutrition 13 (1966), S. 137-149 
    ISSN: 1573-9104
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Summary The Federal Institute for Agricultural Chemistry in Vienna has for a number of years investigated the mineral composition of different varieties of wheat and the influence of the nutritional status and other chemical factors of the soil on the minerals in the wheat plant. In addition, the mineral composition of the wheat plants has been investigated as to how it is dependent on the developmental state and growth of the plants. To this end it was necessary to use a point of reference which is constant during all of the growing period. Dry matter and ash are therefore not suitable for this purpose. Useful points of reference were found to be “the average plant”, the “total nutrient uptake per unit area” or the mineral content of the seed used. The investigations are by no means yet completed but some of the many data so far obtained, have been analysed. They concern not only the major but also a number of minor elements and they are presented in a summarized form. It can be seen that comparatively little information can be obtained from data relating the mineral content of the plants to their dry matter content and that luxury consumption and varietal differences of nutrient uptake and nutrient storage come to light, using the suggested points of reference.
    Abstract: Résumé Depuis plusieurs années à la station fédérale de chimie agricole de Vienne des recherches sont en cours pour déterminer dans quelle mesure la teneur en substances minérales du blé depend des variétés, de la fumure et des facteurs agropédologiques. Les variations taux de substances minérales dans les diverses parties de la plante, pendant de la phase de la développement de la végétation, ont également été suivies. Il est nécessaire pour cela de rapporter les résultats à une valeur de référence qui reste constante durant toute la période de végétation. Le poids sec le taux de cendres, ne peuvent servir de référence. Il s'est révélé objectif de rapporter les résultats à la plantule moyenne, et de ramener les prélèvements de minéraux à la surface cultivée; le taux de substances minérales d'un grain de semence est aussi une référence utilisable. Nos recherches ne sont nullement terminées; une partie de nos très nombreux résultats numériques, qui se rapportent aussi bien aux macroéléments qu'à divers oligoéléments, ont été exploités et présentés de facon synthétique. L'information pauvre de la valeur relative des taux rapportés au poids sec apparaît ainsi; on peut mettre en évidence une consommation de luxe, ainsi qu'une différence dans le pouvoir d'absorption et de stockage selon la variété.
    Notes: Zusammenfassung Seit mehreren Jahren sind an der Wiener Landw.-chemischen Bundesversuchsanstalt in Wien Untersuchungen im Gange, die zeigen sollen, ob und wie der Mineralstoffgehalt von Weizen sortenabhängig ist und wie der Mineralstoffgehalt verschiedener Sorten vom Düngungszustand und sonstigen bodenchemischen Faktoren abhängt. Auch wurde geprüft, wie sich der Mineralstoffgehalt in verschiedenen Teilen der Pflanze und in der ganzen Pflanze im Laufe der Vegetationsperiode verändert. Hierbei ist es notwendig, die Ergebnisse auf eine während der ganzen Vegetationszeit gleichbleibende Bezugsgröße zu beziehen. Trockengewicht oder Aschegehalt kommen daher nicht in Frage. Als geeignete Bezugsgrößen erwiesen sich die durchschnittliche Einzelpflanze, der Gesamtentzug pro Flächeneinheit, aber auch der Mineralstoffgehalt eines Saatkornes scheint brauchbar zu sein. Die Untersuchungen sind noch keineswegs abgeschlossen, ein Teil des vorhandenen außerordentlich umfangreichen Zahlenmaterials, das sich sowohl auf die Massenelemente als zum Teil auch auf die Spurenelemente bezieht, konnte aber schon ausgewertet werden und wird in übersichtlicher Form dargestellt. Der verhältnismäßig geringe Informationsgehalt der auf Trockensubstanz bezogenen Zahlen kommt hierbei deutlich zum Ausdruck und Luxuskonsum und sortenabhängiges Speicher- und Aufnahmevermögen werden deutlich.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Molecular and cellular biochemistry 64 (1984), S. 89-95 
    ISSN: 1573-4919
    Keywords: ethanol ; plasma membranes ; phospholipid (rat liver) ; miocroviscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Summary Male Wistar rats were maintained for 35–40 days on a liquid diet containing 36% of calories as ethanol. Ethanol was replaced by carbohydrates in the isocaloric diet fed to control animals. The effect of ethanol consumption has been studied on the fluorescence polarization of rat liver plasma membranes and artificial lipid vesicles and on the lipid composition of the membranes. Fluorescence polarization in both membranes and vesicles was determined using DPH and TMA-DPH as fluorescence markers; from these data, the polarization term (ro/r−1)−1 and flow activation energy (ΔE) were calculated. The ethanol consumption induces a more fluid environment within the membrane core of liver plasma membranes; the ethanol-fed rat membranes are more resistant to the in vitro effect of ethanol disordering the membrane structure. Vesicles obtained with lipids from either control membranes or ethanol-fed rat membranes were treated with ethanol and the changes in polarization paralleled to those exhibited by the membranes. The absence of phase transitions and of ΔE changes was also shown in temperature-dependence studies. The lower cholesterol content found in ethanol-fed rat plasma membranes might be responsible for observed variations in the microviscosity.
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  • 9
    ISSN: 1617-4623
    Keywords: GC clusters ; Mobile elements ; Target sites ; mtDNA ; Saccharomyces cerevisiae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary GC clusters constitute the major repetitive elements in the mitochondrial (mt) genome of the yeast Saccharomyces cerevisiae. Many of these clusters are optional and thus contribute much to the polymorphism of yeast mtDNAs. We have made a systematic search for polymorphic sites by comparing mtDNA sequences of various yeast strains. Most of the 26 di- or polymorphic sites found differ by the presence or absence of a GC cluster of the majority class, here referred to as the M class, which terminate with an AGGAG motif. Comparison of sequences with and without the GC clusters reveal that elements of the subclasses M1 and M2 are inserted 3′ to a TAG, flanked by A+T rich sequences. M3 elements, in contrast, only occur in tandem arrays of two to four GC clusters; they are consistently inserted 3′ to the AGGAG terminal sequence of a preexisting cluster. The TAG or the terminal AGGAG, therefore, are regarded as being part of the target sites for M1 and M2 or M3 elements, respectively. The dinucleotide AG is in common to both target sites; it also occurs at the 3′ terminus (AGGAG). This suggests its duplication during GC cluster insertion. This notion is supported by the observation that GC clusters of the minor classes G and V similarily repeat at their 3′ terminus a GT or an AA dinucleotide, respectively, from their putative target sites.
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  • 10
    ISSN: 1617-4623
    Keywords: Glucose repression ; Glucose derepression ; Regulatory genes ; Expression analysis ; Saccharomyces cerevisiae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Yeast strains carrying one of the two regulatory mutations cat1 and cat3 are defectve in derepression of several glucose-repressible enzymes that are necessary for utilizing non-fermentable carbon sources. Hence, these strains fail to grow on ethanol, glycerol or acetate. The synthesis of isocitrate lyase, malate synthase, malate dehydrogenase and fructose-1,6-bisphosphatase is strongly affected in cat1 and cat3 strains. Genes CAT1 and CAT3 have been isolated by complementation of the cognate, mutations after transformation with an episomal plasmid gene library. The restriction map of CAT1 proved its allelism to the earlier isolated SNF1 gene. Both genes appear to exist as single-copy genes per haploid genome as indicated by Southern hybridization. Northern analysis has shown that the 1.35 kb CAT3 mRNA is constitutively expressed, independent of the carbon source in the medium. Derepression studies with CAT3 transformants using a multi-copy plasmid showed over-expression of glyoxylate cycle enzymes. This result would be consistent with a direct effector function for the CAT3 gene product.
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