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  • 1
    Schriftenreihen ausleihbar
    Schriftenreihen ausleihbar
    Report and preliminary results of R/V Meteor Cruise M 58/3 : Las Palmas (Spain) - Ponte Delgada (Portugal), June 11th - June 24th, 2003 (2005)
    Bremen : Fachbereich Geowiss., Univ.
    Details Verfügbarkeit
    Signatur: ZSP-166(233)
    Materialart: Schriftenreihen ausleihbar
    Seiten: 50 S. , Ill., graph. Darst.
    Serie: Berichte aus dem Fachbereich Geowissenschaften der Universität Bremen 233
    Klassifikation:
    Ozeanographie
    Standort: Kompaktmagazin unten
    Zweigbibliothek: GFZ Bibliothek
    Standort Signatur Erwartet Verfügbarkeit
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    BUCH
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  • 2
    Schriftenreihen ausleihbar
    Schriftenreihen ausleihbar
    Report and preliminary results of R/V Poseidon Cruise 296 : Las Palmas (Spain) - Las Palmas (Spain), April 04th - April 14th, 2003 (2005)
    Bremen : Fachbereich Geowiss., Univ.
    Details Verfügbarkeit
    Signatur: ZSP-166(231)
    Materialart: Schriftenreihen ausleihbar
    Seiten: 42 S. , Ill., graph. Darst.
    Serie: Berichte aus dem Fachbereich Geowissenschaften der Universität Bremen 231
    Klassifikation:
    Ozeanographie
    Standort: Kompaktmagazin unten
    Zweigbibliothek: GFZ Bibliothek
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Copper induction of carotenoid synthesis in the bacterium Myxococcus xanthus (2005)
    Oxford, UK : Blackwell Science Ltd
    Molecular microbiology 56 (2005), S. 0 
    Details
    ISSN: 1365-2958
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie , Medizin
    Notizen: Copper induces a red pigmentation in cells of the bacterium Myxococcus xanthus when they are incubated in the dark, at suboptimal growth conditions. The colouration results from the accumulation of carotenoids, as demonstrated by chemical analysis, and by the lack of a copper effect on M. xanthus mutants affected in known structural genes for carotenoid synthesis. None of several other metals or oxidative agents can mimic the copper effect on carotenoid synthesis. Until now, blue light was the only environmental agent known to induce carotenogenesis in M. xanthus. As happens for the blue light, copper activates the transcription of the structural genes for carotenoid synthesis through the transcriptional activation of the carQRS operon. This encodes the ECF sigma factor CarQ, directly or indirectly responsible for the activation of the structural genes, and the anti-sigma factor CarR, which physically interacts with CarQ to blocks its action in the absence of external stimuli. All but one of the other regulatory elements known to participate in the induction of carotenoid synthesis by blue light are required for the response to copper. The exception is CarF, a protein required for the light-mediated dismantling of the CarR–CarQ complex. In addition to carotenogenesis, copper induces other unknown cellular mechanisms that confer tolerance to the metal.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2958.2005.04613.x
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    facet.materialart.
    Unbekannt
    The scholarly transition of female academics at the University of Granada (1975-1990) (2005)
    Springer
    Details
    Publikationsdatum: 2005-08-01
    Print ISSN: 0138-9130
    Digitale ISSN: 1588-2861
    Thema: Buch- und Bibliothekswesen, Informationswissenschaft , Wissenschaftskunde und Wissenschaftsorganisation, Hochschul- und Universitätswesen, Museumswissenschaft
    Publiziert von Springer
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    facet.materialart.
    Unbekannt
    Airborne behaviour of Echium pollen (2005)
    Springer
    Details
    Publikationsdatum: 2005-06-01
    Print ISSN: 0393-5965
    Digitale ISSN: 1573-3025
    Thema: Biologie
    Publiziert von Springer
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Characterization and Properties of Cholesterol Desaturases from the Ciliate Tetrahymena thermophila (2005)
    Oxford, UK : Blackwell Publishing
    The @journal of eukaryotic microbiology 52 (2005), S. 0 
    Details
    ISSN: 1550-7408
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: Abstract. Live Tetrahymena thermophila transforms exogenous cholesterol into 7,22-bis, dehydrocholesterol (DHC) by desaturation at positions C7(8) and C22(23) of the cholesterol moiety. In this first report on expression, isolation, characterization, and reconstitution of Tetrahymena's cholesterol desaturases in cell-free extracts, we describe conditions for increasing the expression of both desaturases based on the addition of specific sterols to the culture medium. Reactions performed in vitro, with isolated microsomes, yield only the mono-unsaturated derivatives, 7-DHC and/or 22-DHC. However, selectivity towards one product can be improved with the addition of specific compounds: β-mercaptoethanol inhibited C22(23) desaturase activity completely, while ethanol selectively increased this activity. Detergent-solubilized microsomes showed no desaturase activity, but partial restoration could be achieved with addition of dilauroyl-phosphatidylcholine liposomes (25%). Both cholesterol desaturases require molecular oxygen and cytochrome b5. NADH or NADPH can serve as reduced cofactors, albeit with different efficiency, delivered by reductases present in the microsomal fraction. Azide and cyanide, but not azole compounds, inhibited these desaturases, suggesting a key role for cytochrome b5 in these reactions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1550-7408.2005.3279rr.x
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    Ecological and historical filters constraining spatial caddisfly distribution in Mediterranean rivers (2005)
    Oxford, UK : Blackwell Science Ltd
    Freshwater biology 50 (2005), S. 0 
    Details
    ISSN: 1365-2427
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: 1. Contemporary species distributions are determined by a mixture of ecological and historical filters acting on several spatial and temporal scales. Mediterranean climate areas are one of the world's biodiversity hotspots with a high level of endemicity, which is linked to complex ecological and historical factors.2. This paper explores the ecological and historical factors constraining the distribution of caddisfly species on a large regional scale. A total of 69 taxa were collected from 140 sampling sites in 10 Iberian Mediterranean river basins. Approximately 74% of taxa can be considered rare, with the southern basins (the Baetic–Riffian region) having greater endemicity. The greatest richness, involving a mixture of northern and southern species, was found in the transitional area between the Baetic–Riffian region and the Hesperic Massif.3. The historical processes occurring during the Tertiary (i.e. the junction of the Eurasian and African plates) explained 3.1% of species distribution, whereas ecological factors accounted for 20.7%. Only 0.3% was explained by the interaction of history and ecology. A set of multi-scale ecological variables (i.e. basin, reach and bedform characteristics) defined five river types with specific caddisfly assemblages. The commonest caddisfly species accounted for the regional distribution pattern, while rare taxa contributed to the explanation of subtle patterns not shown by common species.4. Despite the importance of historical factors for biogeography and the large scale used in our study, ecological variables better explained caddisfly distribution. This may be explained by the length of time since the historical process we are considering, the high dispersion and colonisation capacity of many caddisfly species, and the strong environmental gradient in the area. Because of the historical and environmental complexity of Mediterranean areas, rare taxa should be included in ecological studies so that the singularity of these ecosystems is not missed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2427.2005.01357.x
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    COMMENTARY: ASKING A SERIES OF QUESTIONS TO DETERMINE THE TYPE OF CONSUMER OR TRAINED PANEL NEEDED (2005)
    Oxford, UK : Blackwell Science Inc
    Journal of sensory studies 20 (2005), S. 0 
    Details
    ISSN: 1745-459X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1745-459X.2005.00043.x
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    Digitale Medien
    Digitale Medien
    LEARNING PRECONDITIONS FOR PLANNING FROM PLAN TRACES AND HTN STRUCTURE (2005)
    Boston, USA and Oxford, UK : Blackwell Publishing, Inc.
    Computational intelligence 21 (2005), S. 0 
    Details
    ISSN: 1467-8640
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Informatik
    Notizen: A great challenge in developing planning systems for practical applications is the difficulty of acquiring the domain information needed to guide such systems. This paper describes a way to learn some of that knowledge. More specifically, the following points are discussed. (1) We introduce a theoretical basis for formally defining algorithms that learn preconditions for Hierarchical Task Network (HTN) methods. (2) We describe Candidate Elimination Method Learner (CaMeL), a supervised, eager, and incremental learning process for preconditions of HTN methods. We state and prove theorems about CaMeL's soundness, completeness, and convergence properties. (3) We present empirical results about CaMeL's convergence under various conditions. Among other things, CaMeL converges the fastest on the preconditions of the HTN methods that are needed the most often. Thus CaMeL's output can be useful even before it has fully converged.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1467-8640.2005.00279.x
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
    Digitale Medien
    Digitale Medien
    Antagonism among Gluconacetobacter diazotrophicus strains in culture media and in endophytic association (2005)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology ecology 54 (2005), S. 0 
    Details
    ISSN: 1574-6941
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: In this study the antagonistic activity among 55 Gluconacetobacter diazotrophicus strains, belonging to 13 electrophoretic types (ETs), in culture media was analyzed. Antagonistic effects were seen only in strains belonging to two ETs named ET-1 and ET-3. Two out of 29 ET-1 strains, and 3 out of 7 ET-3 strains of G. diazotrophicus showed antagonistic effects against many other strains belonging to all the ETs of this species analyzed, and against closely related strains of Gluconacetobacter species, including Gluconacetobacter johannae, Gluconacetobacter azotocaptans and Gluconacetobacter liquefaciens but not against other phylogenetically distant bacterial species. Results showed that the substance responsible of such antagonistic activity is a low molecular mass molecule (approximately 3400 Da), stable from pH 3.5 to 8.5, and very stable at 4 °C for 10 months. This substance was sensitive to proteases, and the antagonistic activity was lost after 2 h at 95 °C. All of these features show that the substance is related to bacteriocin-like molecules. The antagonistic substance should be chromosomally encoded because ET-3 strains of G. diazotrophicus do not harbor any plasmids. The antagonistic ability of ET-3 strains of G. diazotrophicus could be an advantage for the natural colonization of the sugarcane environment, as was observed in experiments with micropropagated sterile sugarcane plantlets co-inoculated with a bacteriocin-producer strain and a bacteriocin-sensitive strain of G. diazotrophicus. In these experiments, both in the rhizosphere as well as inside the roots, the bacteriocin-sensitive population decreased drastically. In addition, this study shows that inside the plants there may exist antagonistic interactions among endophytic bacteria like to those described among the rhizospheric community.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1016/j.femsec.2005.02.011
    Standort Signatur Erwartet Verfügbarkeit
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