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  • 1
    Monograph available for loan
    Monograph available for loan
    Frankfurt a. M. : Fischer
    Call number: IASS 13.0073 ; IASS 13.0114
    Type of Medium: Monograph available for loan
    Pages: 231 S. : Ill.
    ISBN: 9783100037022
    Branch Library: IASS Library
    Branch Library: IASS Library
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  • 2
    Call number: G 5846
    Type of Medium: Monograph available for loan
    Pages: 234 S. : Kt., graph. Darst.
    Note: Aachen, Techn. Hochschule, Diss., 1975
    Location: Upper compact magazine
    Branch Library: GFZ Library
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  • 3
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The inhibition of rat small intestinal cytochrome c oxydase by in vivo administration of chloramphenicol and oxytetracycline has been demonstrated histochemically. Since the dwelling time of newly formed epithelial cells in the crypts of jejunum is 10–14 h, it was surprising to find inhibition of cytochrome c oxydase after 12 h treatment not only in the crypts but also in the villus. These experiments led to the conclusion that cytochrome c oxidase is continuously synthesized, and probably also degraded in the villous cells. Coupling of oxidative phosphorylation is still present after 48 h antibiotic treatment, when the effect on cytochrome c oxydase appeared to be maximal, as judged by the persistance of 2,4-dinitro-phenol-stimulated adenosinetriphosphatase. Finally, prolonged (⩾48 h) antibiotic treatment often led to retraction of connective tissue (which supports the villous epithelial cells), resulting in loosening and loss of cells from the tops of the villi.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In the presence of excess β-glycerophosphate or p-nitrophenylphosphate NADPH diaphorase of the epithelial cell in rat small intestine has its highest activity in the villi at the basis of the microvilli, where smooth endoplasmic reticulum of the cells is present. In the absence of β-glycerophosphate or p-nitrophenylphosphate the diaphorase activity is much higher and broader localized in crypts and villi. The increased activity is due to the conversion of NADPH to NADH by non-specific (mostly alkaline-) phosphatase activity, so that both NADPH and NADH diaphorase activities are measured. When NADPH is generated by a specific NADP+-linked dehydrogenase, such as glucose-6-phosphate dehydrogenase, and nitroblue tetrazolium is present to trap the reducing equivalents formed, the histochemical localization of the dehydrogenase is identical to that of NADPH diaphorase, although the dehydrogenase may be present in another cell compartment (glucose-6-phosphate dehydrogenase for instance has a cytosolic distribution). Therefore the localization of a dehydrogenase may be falsely interpreted histochemically, according to the diaphorase reaction involved. A different localization may be obtained when the diaphorase reaction is circumvented by the addition of an alternative hydrogen carrier, such as phenazine methosulphate. Also in coupled dehydrogenase assays this may be observed. The hexokinase reaction, coupled to the glucose-6-phosphate dehydrogenase reaction in the presence of nitroblue tetrazolium and the absence of phenazine methosulphate, has a distribution identical to NADPH diaphorase. In the presence of phenazine methosulphate the enzyme has an almost ubiquitous distribution in the small intestinal epithelial cell. When a substrate may react both with NADP+- and NAD+-linked dehydrogenases, such as L-malate: NADP oxido-reductase (decarboxylating) and L-malate: NAD oxidoreductase respectively, the high activity of intestinal alkaline phosphatase may influence the histochemical distribution by converting part of NADP+ to NAD+. The addition of another phosphate ester, such a β-glycerophosphate or p-nitrophenylphosphate, may therefore influence the observed distribution.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-1254
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Notes: Summary Temporal integrity constraints describe long-term data dependencies in databases to be satisfied by each correct database evolution. They can be formulated in a temporal logic. For a runtime monitoring of temporal integrity the problem arises to handle the historical information necessary to monitor the long-term dependencies. This paper extends the already known techniques for minimizing the stored information for a single substitution of the free constraint variables using transition graph construction. Our extension allows to decrease also the amount of handled substitutions for constraint monitoring. For this purpose, the notion of substitution descriptions is formally introduced allowing to monitor simultaneously whole substitution sets. The notions of formula validity and of stepwise monitoring potential validity of temporal constraints are redefined for descriptions. Based on these notions an algorithm for monitoring temporal integrity by handling descriptions is presented.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical and applied genetics 19 (1949), S. 254-261 
    ISSN: 1432-2242
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Zusammenfassung Die ersten 36 im Institut für gärtnerischen Pflanzenbau zu Berlin-Dahlem ausgelesenen Apfelunterlagenklone aus 4 Sämlingsherkünften vonMalus baccata wurden in 2 Veredlungsjahrgängen auf ihre baumschulmäßige Leistung entsprechend früheren Untersuchungen mitMalus-Typen und Klonen aus Apfelwildlingen geprüft. Ihr Ertrag an pflanzwürdigen zweijährigen Hochbüschen wies beträchtliche Unterschiede auf: bei 4 Klonen war er sehr gut, bei I2 gut, bei 7 mittel, bei 4 gering und bei 9 sehr gering. Auch bei den schlechten Gruppen war die Anzahl einjähriger Veredlungen und in diesem Zustande zurückgebliebener zweijähriger Pflanzen häufig recht hoch. Die Augenannahme verbürgte also noch keine normale Weiterentwicklung des Edeltriebes. Auch die Extreme der Wuchsstärken waren außergewöhnlich hoch. Voni9 vergleichbaren Klonen waren 8 äußerst stark, 6 sehr stark, 3 mittelstark und 2 sehr schwach wachsend, während die Gruppen stark und schwach ganz ausfielen. Die im Durchschnitt recht hohe Wuchsleistungszahl wurde im allgemeinen durch einen besonders starken Stamm und längere Seitenäste verursacht. Die größe der einjährigen Veredlungen zeigte keine unbedingte Übereinstimmung mit den Büschen. Wuchsstärke und Ertrag der einzelnen Klone liefen weniger parallel als bei den Wildlingsauslesen, ebenso ergaben sich in dieser Beziehung auch Unterschiede der Sämlingsherkünfte. Bei den veredelten Sorten traten einigermaßen gleich gerichtete Differenzen in Zahl und Größe der Büsche auf.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical and applied genetics 17-18 (1947), S. 224-232 
    ISSN: 1432-2242
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical and applied genetics 19 (1949), S. 315-318 
    ISSN: 1432-2242
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical and applied genetics 19 (1949), S. 199-205 
    ISSN: 1432-2242
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Zusammenfassung Bei einer mehrjährigen Veredlungsprüfung von 155 im Institut für gärtnerischen Pflanzenbau der Universität Berlin aus 6 Herkünften von Apfelwildlingen ausgelesenen Unterlagenklonen ergab sich nach dem Ertrag an pflanzwürdigen zweijährigen Hochbüschen und deren Wuchsstärke eine ähnliche Gruppeneinteilung wie bei denMalus-Typen. Guten Ertrag brachten 49 Klone, einen mittleren 65, einen geringen 24 und einen sehr geringen 17. Sehr stark wachsend waren 15 Klone, stark wachsend 50, mittelstark 53, schwach 13 und sehr schwach 1. Bei 23 Klonen konnte wegen zu starken Ausfalls die Wuchsstärke nicht beurteilt werden. Auffällige Unterschiede im Anteil der Herkünfte an den einzelnen Leistungsgruppen traten nicht hervor. Die Wuchsstärke der Veredlungen wich noch häufiger nach oben oder unten von der des zugehörigen Standbaumes ab als bei denMalus-Typen. Dagegen brachten übereinstimmend mit diesen die stark wachsenden Klone überwiegend auch die größte Anzahl von Büschen. Insgesamt hat sich gezeigt, daß bei der Selektion der Sämlinge wertvolles Material gewonnen wurde, das in weiterer baumschulmäßiger und obstbaulicher Bearbeitung steht.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1432-0630
    Keywords: 6855 ; 7280E ; 7340L
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Modulation doped Al0.3Ga0.7As/In x Ga1−x As/GaAs high electron mobility transistor structures for device application have been grown using molecular beam epitaxy. Initially the critical layer thickness for InAs mole fractions up to 0.5 was investigated. For InAs mole fractions up to 0.35 good agreement with theoretical considerations was observed. For higher InAs mole fractions disagreement occurred due to a strong decrease of the critical layer thickness. The carrier concentration for Al0.3Ga0.7As/In x Ga1−x As/GaAs high electron mobility transistor structures with a constant In x Ga1−x As quantum well width was investigated as a function of InAs mole fraction. If the In x Ga1−x As quantum well width is grown at the critical layer thickness the maximum carrier concentration is obtained for an InAs mole fraction of 0.37. A considerable higher carrier concentration in comparison to single-sided δ-doped structures was obtained for the structures with δ-doping on both sides of the In x Ga1−x As quantum well. Al0.3Ga0.7As/In x Ga1−x As/GaAs high electron mobility transistor structures with InAs mole fractions in the range 0–0.35 were fabricated for device application. For the presented field effect transistors best device performance was obtained for InAs mole fractions in the range 0.25–0.3. For the field effect transistors with an InAs mole fraction of 0.25 and a gate length of 0.15 μm a f T of 115 GHz was measured.
    Type of Medium: Electronic Resource
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