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  • 1
    Digitale Medien
    Digitale Medien
    [s.l.] : Nature Publishing Group
    Nature 298 (1982), S. 718-723 
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Recognition by cro repressor protein of its specific DNA binding sites appears to occur via multidentate hydrogen bonds between amino acid side chains of the protein and base-pair atoms in the major groove of right-handed B-form DNA. Most of the sequence-specific interactions between cro and DNA, ...
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    [s.l.] : Nature Publishing Group
    Nature 290 (1981), S. 754-758 
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] The three-dimensional structure of the 66-amino acid cro repressor protein of bacteriophage λ suggests how it binds to its operator DNA. We propose that a dimer of cro protein is bound to the B-form of DNA with the 2-fold axis of the dimer coincident with the 2-fold axis of DNA. A pair of ...
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    [s.l.] : Nature Publishing Group
    Nature 290 (1981), S. 334-335 
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] If anything, the large number of protein structures and amino acid sequences now known has confused rather than simplified the main issue of whether extant proteins have evolved from a small number of ancestral precursors or have arisen independently. When the amino acid sequences are closely ...
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Springer
    Applied physics 2 (1973), S. 133-135 
    ISSN: 1432-0630
    Schlagwort(e): Ag−Si superlattice ; switching characteristics
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract Layer structures of successive silver and silicon monoxide layer pairs were made using evaporating techniques. Small angle X-ray diffraction and multiple reflection interferometric techniques have been used to establish the identity periods of the samples. these samples were found to have switching characteristics. Slow and fast switching was observed and the application of voltage would induce switching into higher as well as into lower resistance states. Sequential switching through multiple resistance states has also been observed.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    [s.l.] : Nature Publishing Group
    Nature 226 (1970), S. 511-514 
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] At least three factors, M1, M2 and M3, are required for initiating the synthesis of new and complete haemoglobin α and β chains at low Mg2+ concentration. The M factors are distinct from the chain elongation T factors but resemble the ...
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Springer
    Materials and structures 16 (1983), S. 343-352 
    ISSN: 1359-5997
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Architektur, Bauingenieurwesen, Vermessung
    Beschreibung / Inhaltsverzeichnis: Résumé On a mesuré les caractéristiques de résistance à l'impact de matériaux composites faits de polymères et de granulats rocheux afin de déterminer leur capacité d'utilisation comme matériaux de protection adaptés à des fins particulières. On a considéré divers polymères durcissables à froid, mais la plus grande partie de l'étude expérimentale a porté sur l'utilisation de deux polyuréthanes chargés de sable en tant que matériaux d'enrobage de divers granulats naturels. Ces différentes compositions ont été optimisées en termes de production économique. On a également considéré l'effet de température. Les expériences ont été conduites avec des projectiles d'un diamètre de 7,62 mm avec une vitesse d'impact régulière d'approximativement 810 m/s et possédant une masse d'environ 9,5 g et conçus en s'appuyant sur la théorie de réponse de surface afin d'étudier l'influence du dosage sur la résistance à l'impact ainsi que des caractéristiques angulaires et des dimensions du granulat, du type de roche et des propriétés du polymère. L'analyse des résultats opérée au moyen d'une optimisation statistique aux différentes étapes de l'expérimentation a permis de déterminer une combinaison pratique des paramètres par lesquels se trouve optimisée la résistance à l'impact. La meilleure capacité d'absorption de l'énergie a été vérifiée avec une teneur en résine polyuréthane d'environ 10% en poids, 30% de sable «zone 2» et 60% de gravier roulé de rivière renfermant des granulats de grande taille. Les essais statiques ont montré que le matériau est propre à être utilisé en tant que matériau de protection dans la mesure où il ne supporte pas de charge.
    Notizen: Abstract Composites cast from polyurethane resins, rock aggregates and sand have been examined to determine their resistance to penetration by high velocity projectiles. The effects of using different polymer and rock types have been investigated, and the resultant composite mixes have been optimized using response surface theory to obtain a protective material to clad buildings rapidly and economically. Variables considered in the mix optimization were % polymer, % aggregate, aggregate particle size, and polymer hardness. Penetration tests were carried out on the optimized composites to determine the thickness required for a given confidence level of projectile containment.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    ISSN: 1432-1203
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary The structural gene encoding human δ-aminolevulinate dehydratase has been assigned to the long arm of chromosome 9 by somatic cell hybridization techniques using murine erythroleukemia-human fibroblast somatic cell hybrids. Dimethyl sulfoxide induction of erythroid differentiation in these hybrid cells resulted in a 3 to 12-fold increase in the levels of total δ-aminolevulinate dehydratase. Human δ-aminolevulinate dehydratase was detected by an immunodiscrimination assay using polyclonal mouse anti-human δaminolevulinate dehydratase antibodies. Of four primary hybrid clones, each from an independent fusion, one hybrid line, XX-8, was positive for human δ-aminolevulinate dehydratase. Examination of 23 secondary, tertiary, and quaternary XX-8 subclones revealed that the expression of the human isozyme segregated with human chromosome 9q, confirming the provisional regional assignment made by classical linkage studies. One positive quaternary clone, XX-8-H21-H7-2, expressed human δ-aminolevulinate dehydratase activity and contained only human 9q13»qter. In addition, studies of tetiary and quaternary subclones from two series, XX-8-A31 and XX-8-H21-H7, indicated that murine regulatory factors increased the human as well as the murine enzymatic activity following induction of erythroid differentiation.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    ISSN: 1573-0832
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Abstract Aspergillus flavus Link ex Fries and A. parasiticus Speare can invade peanut kernels and under certain environmental conditions produce unacceptable levels of the mycotoxin aflatoxin. A concerted effort is underway to reduce aflatoxin contamination in peanut and peanut products. A potentially effective method of control in peanut is the discovery and use of genes for resistance to either fungal invasion or aflatoxin formation. The objective of the present experimental study was to develop an effective and efficient procedure for screening individual plants or pods of single plants for resistance to invasion by the aflatoxigenic fungi and subsequent aflatoxin production. Methods of obtaining adequate drought-stress and fungal infection were developed through this series of experiments. By completely isolating the pods from the root zone and imposing drought-stress only on pegs and pods, high levels of fungal infection were observed. High amounts of preharvest aflatoxin accumulation were also produced by completely isolating the pods from the root zone. Mid-bloom inoculation with A. parasiticus-contaminated cracked corn and drought-stress periods of 40 to 60 days were the most effective procedures. This technique was used to assess peanut genotypes previously identified as being partially resistant to A. parasiticus infection or aflatoxin contamination, and segregating populations from four crosses. Variability in aflatoxin contamination was found among the 11 genotypes evaluated, however, none were significantly lower than the standard cultivars. Broad-sense heritability of four crosses was estimated through evaluation of seed from individual plants in the F2 generation. The heritability estimates of crosses GFA-2 × NC-V11 and Tifton-8 × NC-V11 were 0.46 and 0.29, respectively, but mean aflatoxin contamination levels were high (73,295 and 27,305 ppb). This greenhouse screening method could be an effective tool when genes for superior aflatoxin resistance are identified.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    Publikationsdatum: 1973-09-01
    Print ISSN: 0340-3793
    Thema: Maschinenbau , Physik
    Publiziert von Springer
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
    Publikationsdatum: 2016-06-01
    Print ISSN: 1939-1234
    Digitale ISSN: 1939-1242
    Thema: Energietechnik
    Publiziert von Springer
    Standort Signatur Erwartet Verfügbarkeit
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