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  • 1
    Call number: G 8147 ; G 8411
    Type of Medium: Monograph available for loan
    Pages: 97 S. + Anh.
    Location: Upper compact magazine
    Location: Upper compact magazine
    Branch Library: GFZ Library
    Branch Library: GFZ Library
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  • 2
    Call number: MOP 4878
    Type of Medium: Monograph available for loan
    Pages: IV, 283 S. : Ill., graph. Darst.
    Edition: 2. Aufl., neue Ausg., durch Zusätze verm.
    Location: MOP - must be ordered
    Branch Library: GFZ Library
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  • 3
    Call number: S 99.0054(90)
    In: Geologisches Jahrbuch
    Type of Medium: Series available for loan
    Pages: 100 S. , Ill., Kt. , 7 Kt.-Beil., 1 Tabellenheft u.d.T.: Tabla de las muestras paleontológicas (61 S.)
    ISBN: 3510959272
    Series Statement: Geologisches Jahrbuch : Reihe , Regionale Geologie Ausland 90
    Note: Zsfassung in dt. und span. Sprache
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 4
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 66 (1994), S. 917-918 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 83 (1985), S. 5413-5419 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Photoelectron spectra of single crystals of eight aromatic compounds were measured at several UV wavelengths. Useful results were obtained when sample charging was eliminated by inducing photoconduction through subsidiary illumination of the sample crystal with low energy light, and/or by a vapor-deposited gold grid on the sample surface. The threshold ionization potential obtained for a single crystal was found always to be lower than that for the corresponding polycrystalline film.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1546-170X
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] Positron emission tomography (PET) is now regularly used in the diagnosis and staging of cancer. These uses and its ability to monitor treatment response would be aided by the development of imaging agents that can be used to measure tissue and tumor proliferation. We have developed and tested ...
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1546-170X
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] Immunization with myelin antigens leads to the development of experimental autoimmune encephalomyelitis, an animal model of multiple sclerosis. The disease can also be induced by the transfer of encephalitogenic CD4+ T helper (TH) lymphocytes into naive mice. These T cells need to re-encounter ...
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology ecology 50 (2004), S. 0 
    ISSN: 1574-6941
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Ambient concentrations and turnover rates of two amino acids, leucine and methionine, by total bacterioplankton and Prochlorococcus cyanobacteria were determined along a latitudinal transect across the Southern Atlantic gyre using a combined isotopic dilution and flow cytometric sorting technique. The ambient concentrations of methionine (0.2–0.65 nM) were about 2 times higher than the concentrations of leucine, while the turnover rates of the two amino acids were remarkably similar (0.1–0.7 nM d−1). The concentrations of both amino acids did not vary significantly with depth between 3 and 150 m but their turnover rates were 1.5–2 times higher in the top 3–80 m. Prochlorococcus took up amino acids in situ at high rates. Using a representative 35S-methionine precursor, about 25% of total bacterioplankton consumption of amino acids could be assigned to Prochlorococcus with low red fluorescence (Pro LRF) inhabiting the surface mixed layer down to 80 m and about 50% assigned to Prochlorococcus with high red fluorescence (Pro HRF) living below 100 m. In the same deep waters the cellular amino acid uptake of Pro LRF was less than 6% of that of the Pro HRF, indicating declining metabolic activity of the former. The mean cellular uptake rate of Pro HRF at depths below 120 m was 2.5 amol cell−1 d−1, 4 times higher than the rates of Pro LRF in the top 80 m. The difference could be partially explained by Pro HRF cellular biomass being twice that of Pro LRF. The biomass specific rates of Prochlorococcus were comparable or higher (particular of the Pro HRF) than that of other bacterioplankton. The reported findings could explain ecological success of mixotrophic Prochlorococcus cyanobacteria over both strictly autotrophic algae and heterotrophic bacteria in oligotrophic regions sustained by nutrient remineralisation.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Helgoland marine research 20 (1970), S. 655-675 
    ISSN: 1438-3888
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Summary 1. Using 6 phytoplankton species and/or the copepodEuterpina acutifrons or larvae of the sea urchinArbacia lixula the potential inhibitory effects of chemicals released from some 70 different materials (mainly plastics) have been tested. In addition, the effects of 6 detergents have been examined. 2. Several materials, such as natural rubbers and polyvinyl chlorides, are highly toxic and should never be used when experimenting with living marine organisms. 3. Teflon (Algoflon), Perspex, Polyethylene, Tygon, Polypropylene, Polycarbonates (Makrolon) and Polyester (Gabraster) have been shown to be non-toxic and are, therefore, suitable for use in cultivation of marine organisms. Some materials had slightly negative effects on the organisms tested and should, therefore, be used only if no alternatives are available. 4. Some suggestions are advanced on how to construct non-toxic samplers and laboratory equipment used for experiments with marine organisms.
    Notes: Kurzfassung Etwa 80 chemisch verschiedene Substanzen und Materialien wurden hinsichtlich einer möglichen toxischen Wirkung an mehreren Phytoplanktonarten, dem CopepodenEuterpina acutifrons und den Larven des SeeigelsArbacia lixula geprüft. Es zeigte sich, daß die Phytoplankter empfindlichere Testorganismen sind alsEuterpina acutifrons und die Larven vonArbacia lixula. Auch konnte zwischen den verschiedenen Phytoplanktonarten erhebliche Unterschiede in der Reaktion festgestellt werden. Detergentien erwiesen sich nur in relativ hohen Konzentrationen als toxisch. Viele Substanzen, die eine mannigfache Anwendung im Laboratorium finden, wie zum Beispiel roter und schwarzer Gummi oder Polyvinylchlorid, sind ausgesprochen toxisch und sollten nicht für Geräte benutzt werden, die zur Probeentnahme lebender Organismen dienen. Einige Substanzen, die sich zunächst als nicht toxisch erwiesen hatten, wurden toxisch, nachdem sie bei 0,5 atm 20 min in dem Kulturmedium sterilisiert wurden. Es konnte jedoch nachgewiesen werden, daß Polyäthylene (naturfarben), Gabraster (mit Katalysatoren), Perspex, Silicongummi, Algoflon (Teflon), Tygon, Silikon SE 1201 und Kautschuk (für Stöpsel) auch nach dem Sterilisieren optimales Wachstum der Testorganismen zulassen. Da aber Firmen oft die Zusammensetzung ihrer Materialien ändern, müssen die einzelnen Lieferungen immer wieder auf Toxizität geprüft werden. Nur so kann verhindert werden, daß Wasserschöpfer, Planktonnetze und andere Geräte, die zur Probenentnahme von lebenden Organismen benutzt werden, die Organismen nicht bereits negativ beeinflussen, bevor das eigentliche Experiment angesetzt worden ist. Das gleiche gilt natürlich auch für Materialien, die zur Konstruktion der Kulturgefäße und-apparate benutzt werden.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1436-5073
    Keywords: Auger electron spectroscopy ; iron ; surface segregation ; single crystal surfaces
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The analysis of segregation phenomena in bicrystals is an important step for the understanding of combined effects of the elementary diffusion processes involved in the segregation in polycristalline systems. The segregation of Si and P in a Fe-6at.%Si bicrystal with a (100) and (110) surface has been investigated by means of AES (Auger electron spectroscopy). For these experiments the technique of a linearly increased temperature has been applied. Significant differences between the segregation kinetics at the two surfaces of the sample have been found on the one hand for the maximum coverage of P and on the other hand for the high temperature behaviour of Si. Additionally, model calculations based on the KTBIM (kinetic tight binding Ising model) have been performed to qualitatively describe the experimental results. It is shown, that the striking differences between the segregation behaviour at the two differently oriented surfaces can be explained by different segregation energies of P, whereas Si plays a minor role due to its relatively small segregation energy.
    Type of Medium: Electronic Resource
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