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  • 1
    Monograph available for loan
    Monograph available for loan
    Gotha [u.a.] : Klett-Perthes
    Call number: PIK N 630-10-0255
    Description / Table of Contents: Contents: 1. Einleitung ; 2. Polare und subpolare Zone ; 3. Boreale (und antiboreale) Zone ; 4. Temperierte Wald- und Steppenzone ; 4.1 Nemorale (und australe) Wälder ; 4.2 Steppen und Halbwüsten der temperierten Zone ; 5. Subtropen ; 5.1 Laurale Subtropen ; 5.2 Mediterrane Subtropen ; 6. Aride Subtropen und Tropen ; 7. Wechselfeuchte Tropen ; 8. Feuchte Tropen ; 9. Hochgebirge ; 10. Azonale und extrazonale Vegetation ; 11. Zusammenschau zonaler Merkmale
    Type of Medium: Monograph available for loan
    Pages: 448 S. : Ill., graph. Darst., Kt.
    Edition: 1. Aufl.
    ISBN: 3623008591
    Series Statement: Perthes Geographie-Kolleg
    Location: A 18 - must be ordered
    Branch Library: PIK Library
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  • 2
    Call number: MOP Per 675
    Type of Medium: Monograph available for loan
    Pages: XII, 209 S. : Ill., graph. Darst + 12 Faltkt
    ISBN: 3427761312
    Series Statement: Bonner geographische Abhandlungen 63
    Note: Zugl.: Diss
    Location: MOP - must be ordered
    Branch Library: GFZ Library
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  • 3
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Symbioses between bacteria and eukaryotes are ubiquitous, yet our understanding of the interactions driving these associations is hampered by our inability to cultivate most host-associated microbes. Here we use a metagenomic approach to describe four co-occurring symbionts from the marine ...
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1365-2486
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Geography
    Notes: Effects of free-air carbon dioxide enrichment (FACE, 60 Pa pCO2) on plant growth as compared with ambient pCO2 (36 Pa) were studied in swards of Lolium perenne L. (perennial ryegrass) at two levels of N fertilization (14 and 56 g m−2 a−1) from 1993 to 2002. The objectives were to determine how plant growth responded to the availability of C and N in the long term and how the supply of N to the plant from the two sources of N in the soil, soil organic matter (SOM) and mineral fertilizer, varied over time. In three field experiments, 15N-labelled fertilizer was used to distinguish the sources of available N.In 1993, harvestable biomass under elevated pCO2 was 7% higher than under ambient pCO2. This relative pCO2 response increased to 32% in 2002 at high N, but remained low at low N. Between 1993 and 2002, the proportions and amounts of N in harvestable biomass derived from SOM (excluding remobilized fertilizer) were, at high N, increasingly higher at elevated pCO2 than at ambient pCO2. Two factorial experiments confirmed that at high N, but not at low N, a higher proportion of N in harvestable biomass was derived from soil (including remobilized fertilizer) following 7 and 9 years of elevated pCO2, when compared with ambient pCO2.It is suggested that N availability in the soil initially limited the pCO2 response of harvestable biomass. At high N, the limitation of plant growth decreased over time as a result of the stimulated mobilization of N from soil, especially from SOM. Consequently, harvestable biomass increasingly responded to elevated pCO2. The underlying mechanisms which contributed to the increased mobilization of N from SOM under elevated pCO2 are discussed. This study demonstrated that there are feedback mechanisms in the soil which are only revealed during long-term field experiments. Such investigations are thus, a prerequisite for understanding the responses of ecosystems to elevated pCO2 and N supply.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The effects of elevated pCO2 on net ecosystem CO2 exchange were investigated in managed Lolium perenne (perennial ryegrass) and Trifolium repens (white clover) monocultures that had been exposed continuously to elevated pCO2 (60 Pa) for nine growing seasons using Free Air CO2 Enrichment (FACE) technology. Two levels of nitrogen (N) fertilization were applied. Midday net ecosystem CO2 exchange (mNEE) and night-time ecosystem respiration (NER) were measured in three growing seasons using an open-flow chamber system. The annual net ecosystem carbon (C) input resulting from the net CO2 fluxes was estimated for one growing season. In both monocultures and at both levels of N supply, elevated pCO2 stimulated mNEE by up to 32%, the exact amount depending on intercepted PAR. The response of mNEE to elevated pCO2 was larger than that of harvestable biomass. Elevated pCO2 increased NER by up to 39% in both species at both levels of N supply. NER, which was affected by mNEE of the preceding day, was higher in T. repens than in L. perenne. High N increased NER compared to low N supply. According to treatment, the annual net ecosystem C input ranged between 210 and 631 g C m−2 year−1 and was not significantly affected by the level of pCO2. Low N supply led to a higher net C input than high N supply. We demonstrated that at the ecosystem level, there was a long-term stimulation in the net C assimilation during daytime by elevated pCO2. However, because NER was also stimulated, net ecosystem C input was not significantly increased at elevated pCO2. The annual net ecosystem C input was primarily affected by the amount of N supplied.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1072-8368
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] We have used a prototype small cantilever atomic force microscope to observe, in real time, the interactions between individual protein molecules. In particular, we have observed individual molecules of the chaperonin protein GroES binding to and then dissociating from individual GroEL proteins, ...
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Bulletin of environmental contamination and toxicology 32 (1984), S. 510-516 
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Standort 23 (1999), S. 9-14 
    ISSN: 1432-220X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography
    Notes: Einleitung Die nachhaltige Globalisierung der Wirtschaft verschärft nicht nur den internationalen Standortwettbewerb für Unternehmen, sondern führt auch zu einem großen Anpassungsdruck für die deutschen Kommunen. Gleichzeitig engt die angespannte Finanzlage den Handlungsspielraum der Kommunen nicht unerheblich ein. Die kommunale Wirtschaftsförderung als Mittler zwischen Verwaltung und Unternehmen kann – bei effizienter Aufgabengestaltung – großen Einfluß auf die Anpassung der örtlichen Wirtschaft auf die Veränderungen nehmen Auch wenn die kommunale Wirtschaftsförderung selbst keine Finanzmittel oder Subventionen an die Unternehmen ausgeben darf, bieten die Möglichkeiten der Wirtschaftsförderung großen Spielraum. Nach wie vor ist die Beeinflussung materieller Standortfaktoren, wie z.B. in der Gewerbeflächenpolitik, von zentraler Bedeutung. Zusätzlich gewinnen aber “klimatische”, also im weitesten Sinne weiche, Faktoren an Bedeutung. Hierauf weisen nicht nur aktuelle theoretische Konzepte zur Regionalentwicklung hin, sondern auch empirische Befunde der Unternehmen. Zu diesen, auch als Fühlungsvorteile bezeichneten “weichen” Standortfaktoren zählen, z.B. die Geschwindigkeit, mit der Unternehmensanträge bearbeitet oder Genehmigungen beschieden werden, das Engagement der Wirtschaftsförderung bei der Beseitigung von Investitionshemmnissen sowie bei der Herstellung von Kontakten und Beziehungen zwischen allen lokalen und regionalen, bisweilen auch überregionalen Akteuren. Eine Studie des Instituts für Mittelstandsforschung Bonn (IfM), deren Ergebnisse u.a. auf Fallbeispielen aus Nordrhein–Westfalen, Bayern und Brandenburg basieren, zeigt, dass die Notwendigkeit zu einer Neuorientierung von nahezu allen untersuchten Kommunen erkannt, eine tatsächliche umfassende Umsetzung jedoch nur von den wenigsten realisiert wird. Insbesondere im Bereich der Organisationsstruktur sowie bei der Abstimmung mit anderen regionalen Akteuren offenbart sich nach wie vor großer Handlungsbedarf. Auch das Neue Steuerungsmodell hat bisher zu keiner grundlegenden Verbesserung geführt, da seine Einführung zumeist auf die Fachämter für Finanzen beschränkt ist. Eine Reform, die auf eine stärkere Kundenorientierung der kommunalen Verwaltung abzielt, muß jedoch insbesondere die Unternehmen als Adressaten im Blick haben. Deren Interessen werden aber vor allem in der Wirtschaftsförderung berücksichtigt, insofern bedeutet die Realisierung von Kundenorientierung vorrangig eine effiziente und auf die Unternehmensbedürfnisse ausgerichtete Organisationsstruktur der Wirtschaftsförderung. Diese Problemstellung nahm das IfM Bonn zum Anlaß, ein idealtypisches Modell einer kommunalen Wirtschaftsförderung zu entwickeln, das als Grundlage für weiterführende Diskussionen dienen soll. Das Modell setzt sich aus drei Stufen zusammen, in denen die interne Organisationsstruktur der Wirtschaftsförderung sowie ihre Einbindung in ein intra- sowie interregionales Beziehungsgeflecht betrachtet wird. Zusätzlich berücksichtigt das Modell die beiden in der Praxis geläufigsten Organisationsformen der kommunalen Wirtschaftsförderung: Das Amt für Wirtschaftsförderung sowie die privatrechtlich organisierte Gesellschaft.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Photosynthesis research 24 (1990), S. 237-243 
    ISSN: 1573-5079
    Keywords: activated oxygen species ; D1-protein ; photoinhibition ; spinach thylakoids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In a previous paper it was shown that photoinhibition of reaction centre II of spinach thylakoids was predominantly caused by the degradation of D1-protein. An initial inactivation step at the QB-site was distinguished from its breakdown. The present paper deals with the question as to whether this loss of QB-function is caused by oxygen radical attack. For this purpose the photoinhibition of thylakoids was induced at 20°C in the presence of either superoxide dismutase and catalase or the antioxidants glutathione and ascorbic acid. This resulted in comparable though not total protection of D1-protein, photochemistry and fluorescence from photoinhibition. The combined action of both the enzymatic and the non-enzymatic radical scavenging systems brought about an even more pronounced protective effect against photoinhibition than did either of the two systems singularly at saturating concentrations. The results signify a major contribution of activated oxygen species to the degradation process of D1-protein and the related phenomena of photoinhibition. Thylakoids treated with hydroxyl radicals generated through a Fenton reaction showed a loss of atrazine binding sites, electron transport capacity and variable fluorescence in a similar manner, though not to the same extent, as usually observed following photoinhibitory treatment.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Photosynthesis research 24 (1990), S. 229-235 
    ISSN: 1573-5079
    Keywords: chlorophyll fluorescence ; D1-protein ; photoinhibition ; spinach thylakoids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The role of D1-protein in photoinhibition was examined. Photoinhibition of spinach thylakoids at 20°C caused considerable degradation of D1-protein and a parallel loss of variable fluorescence, QB-independent electron flow and QB-dependent electron flow. The breakdown of D1-protein as well as the loss of variable fluorescence and QB-independent electron flow were largely prevented when thylakoids were photoinhibited at 0°C. The QB-dependent electron flow markedly decreased under the same conditions. This inactivation may represent the primary event in photoinhibition and could be the result of some modification at the QB-site of D1-protein. Evidence for this comes from fluorescence relaxation kinetics following photoinhibition at 0°C which indicate a partial inactivation of QA --reoxidation. These results support the idea of D1-protein breakdown during photoinhibition as a two step process consisting of an initial inactivation at the QB-site of the protein followed by its degradation. The latter is accompanied by the loss of PS II-reaction centre function.
    Type of Medium: Electronic Resource
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