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  • 1
    ISSN: 1365-2958
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie , Medizin
    Notizen: A 34 kb fragment of the Nocardia lactamdurans DNA carrying the cluster of early cephamycin biosynthetic genes was cloned in λ EMBL3 by hybridization with probes internal to the pcbAB and pcbC genes of Penicillium chrysogenum and Streptomyces griseus. The pcbAB and pcbC genes were found to be closely linked together in the genome of N. lactamdurans. The pcbAB gene of N. lactamdurans showed the same orientation as the pcbC gene, in contrast to the divergent expression of the genes in the pcbAB-pcbC cluster of P. chrysogenum and Acremonium chrysogenum. The pcbAB gene encodes a large (3649 amino acids) multidomain δ-(L-α-aminoadipyl)-L-cysteinyl-D-valine synthetase with a deduced Mr, of 404134. This enzyme contains three repeated domains and a consensus thioesterase active-site sequence. The pcbC gene encodes a protein of 328 amino acids with a deduced Mr of 37469, which is similar to other isopenicillin N synthases except that it lacks one of two cysteine residues conserved in all other isopenicillin N synthases. The different organization of the pcbAB-pcbC gene cluster in N. lactamadurans and Streptomyces clavuligerus relative to P. chrysogenum and A. chrysogenum is intriguing in relation to the hypothesis of horizontal transference of these genes from actinomycetes to filamentous fungi by a single transfer event.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 41 (1976), S. 0 
    ISSN: 1750-3841
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: The force relaxation curves of deformed specimens of apples, pears and potatoes were studied in compression tests. It was found that ln all three commodities two relaxation curves could cross one another even if one of them started at conditions in which both the deformation and the initial force had higher values. It was also noticed that for deformations bigger than about 5% the residual force was dependent on the rate at which the deformation had been reached. The values of the residual forces of samples deformed at a rate of 10 cm/min were smaller than the values of those samples which were deformed at 1 cm/min. These characteristics of the relaxation phenomenon could be explained by physical irreversible changes which occur during the deformation of the biological material. They could also be represented by a modified rheological model in which the number of active elements and their mode of mechanical response is a function of the deformation and its application rate.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 43 (1978), S. 0 
    ISSN: 1750-3841
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: True compressive stress-strain relationships of various solid foods have been demonstrated in a three-dimensional display that has included the tests true strain histories. The shapes of the stress-strain curves and complementary relaxation and compressiblity data indicated the existence of two antagonistic mechanisms which regulated the stress levels. These were internal fractures which tended to decrease the mechanical strength of the deformed specimens and structural compaction that had the tendency to increase it. It has also been demonstrated that the true stresses could be influenced by the specimen dimensions as well as by the strain rate.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 36 (1980), S. 2816-2819 
    ISSN: 1600-5740
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Amsterdam : Elsevier
    Phytochemistry 20 (1981), S. 517 
    ISSN: 0031-9422
    Schlagwort(e): Baltimora recta ; Compositae ; encelin ; haagenolide. ; sesquiterpene lactones
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Biologie , Chemie und Pharmazie
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Amsterdam : Elsevier
    Phytochemistry 19 (1980), S. 967-968 
    ISSN: 0031-9422
    Schlagwort(e): Chromolaenide derivatives ; antimicrobial activity ; heliangolides ; proof of stereochemistry ; sesquiterpene lactones
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Biologie , Chemie und Pharmazie
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 43 (1978), S. 0 
    ISSN: 1750-3841
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: A processed, nonfermented cheese-like product was prepared by direct acidification of milk and heat coagulation of the curd. Modification of the textural properties was done by the incorporation of carrageenan. Textural evaluation was done by uniaxial compression. The parameters analyzed were true stress-true (Hencky's) strain relationships obtained at two deformation histories, residual stresses after relaxation and true stresses and strains at failure. Results showed that with respect to all these parameters the experimental nonfermented product resembled commercial processed American cheese though at generally smaller strength levels. Introduction of carrageenan contributed solid properties to the experimental processed cheese. At 1% level of carrageenan the product had mechanical properties similar to those of commercial cheese.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    ISSN: 1573-5028
    Schlagwort(e): apomixis ; apospory ; differential display ; megagametophyte ; sexuality
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Limited emphasis has been given to the molecular study of apomixis, an asexual method of reproduction where seeds are produced without fertilization. Most buffelgrass (Pennisetum ciliare (L.) Link syn = Cenchrus ciliaris L.) genotypes reproduce by obligate apomixis (apospory); however, rare sexual plants have been recovered. A modified differential display procedure was used to compare gene expression in unpollinated ovaries containing ovules with either sexual or apomictic female gametophytes. The modification incorporated end-labeled poly(A)+ anchored primers as the only isotopic source, and was a reliable and consistent approach for detecting differentially displayed transcripts. Using 20 different decamers and two anchor primers, 2268 cDNA fragments between 200 and 600 bp were displayed. From these, eight reproducible differentially displayed cDNAs were identified and cloned. Based on northern analysis, one cDNA was detected in only the sexual ovaries, two cDNAs in only apomictic ovaries and one cDNA was present in both types of ovaries. Three fragments could not be detected and one fragment was detected in ovaries, stems, and leaves. Comparison of gene expression during sexual and apomictic development in buffelgrass represents a new model system and a strategy for investigating female reproductive development in the angiosperms.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    Digitale Medien
    Digitale Medien
    Springer
    World journal of microbiology and biotechnology 2 (1986), S. 489-492 
    ISSN: 1573-0972
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Beschreibung / Inhaltsverzeichnis: Résumé Les résultats présentés concernant le fonctionnement de trois réacteurs méthanogènes de dimensions différentes, utilisant comme matière première le jus de pulpe de café. Tous les réacteurs étaient compactés avec de la mousse de polyuréthane non réticulée, et avaient des formes géométriques similaires. Les opérations à l'échelle pilote ont donné une moindre production de gaz par unité de volume, mais un taux de conversion par unité de charge organique plus élevé, même à des températures inférieures.
    Kurzfassung: Resumen Se presentan los resultados de la operación de tres reactores metano-génicos de differente tamaño, usando jugo de pulpa de café como materia prima. Los reactores fueron empacados con esponja de poliuretano no reticulado y se mantuvo una similitud geométrica. La operación de una planta piloto mostró una menor producción de gas por unidad volumétrica de reactor pero conversiones mejores, aún a más bajas temperaturas.
    Notizen: Summary Results from the operation of methanogenic reactors of three different sizes, using coffee pulp juice as raw material, are presented. All reactors were packed with unreticulated polyurethane foam and geometrical similarity was maintained. Pilot plant operation showed lower gas production per unit reactor volume but higher conversions per unit of organic load, even at lower temperatures.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
    Publikationsdatum: 2000-02-01
    Print ISSN: 0027-8424
    Digitale ISSN: 1091-6490
    Thema: Biologie , Medizin , Allgemeine Naturwissenschaft
    Standort Signatur Erwartet Verfügbarkeit
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