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  • 1990-1994  (5)
  • 1965-1969  (2)
  • 1960-1964  (3)
  • 1955-1959  (1)
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  • 1
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 〈list xml:id="l1" style="custom"〉1 Picoplankton community production (0.2–2μm) was investigated over 3 months, June-September 1991, in Llyn Padarn, a mesotrophic upland lake in north Wales.2 The picoplankton was differentiated into autotrophic algae (〈1–3μm) and heterotrophic bacteria (〈0.2–1 μm) using differential filtration through a 1 μm pore size Nuclepore filter.3 Efficient separation of these distinct metabolic constituents of picoplankton was obtained. A good correlation (r= 0.81, P 〈 0.001) was found between physical separation of bacterial and picoalgal cells from fluorescence microscopy and the distribution of heterotrophic metabolic activity between different cell size fractions measured by uptake of 14C-glucose.4 Picoplankton community production was differentiated into the ‘absolute’ autotrophic production by picoalgae, corrected for overestimation due to retention of bacteria with the picoalgae, and the heterotrophic component, bacterial uptake of ‘extracellular organic carbon’ (EOC), derived from the entire phytoplankton community.5 The heterotrophic contribution to picoplankton community production ranged from 88 to 1%, mean value 55% of total. Autotrophic picoplankton production was dominant in June and July, but in August and September heterotrophic uptake of EOC was the major input to picoplankton community production.6 During the 3 months, the mean contributions to plankton production were autotrophic picoplankton 10.3%, heterotrophic bacterial uptake of EOC 9.7%, EOC in lake water 11.6% and phytoplankton (〉3μm) 68.3%.7 Bacteria accounted for about half the picopfankton community production via uptake of EOC. Thus although autotrophic picoplankton were ubiquitous, it is likely that their contribution via primary production to the carbon balance of planktonic environments has been overestimated in previous studies.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 737 (1994), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 713 (1994), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 713 (1994), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Annals of hematology 18 (1968), S. 40-41 
    ISSN: 1432-0584
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 261 (1968), S. 225-238 
    ISSN: 1432-1912
    Keywords: Iron Deficiency ; Iron Absorption ; Iron Complexes ; Rat ; Eisenmangel ; Eisen-Resorption ; Eisenkomplexe ; Ratte
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung 1. Die Retention von freiem und komplexgebundenem 59Fe-Eisen wurde 6 Tage nach Verabreichung mit der Schlundsonde bei normalen und anämischen Ratten in einer Ganztiermeßanlage bestimmt. 2. Anämische Ratten nahmen fünfmal mehr Eisen auf als normale Tiere, wenn ionisiertes Eisen angeboten wurde. Alle geprüften Komplexbildner vermindern die gesteigerte Eisen-Retention anämischer Ratten. Bezogen auf die Werte der anämischen Gruppe (=100%) wurde die Retention durch EDTA um 87%, durch Citronensäure um 40%, durch Ascorbinsäure um 32% und durch Nicotinhydroxamsäure um 31% herabgesetzt. 3. In Gegenwart von Komplexbildnern ist die Eisen-Retention anämischer Tiere bei Citronensäure 8,7, von EDTA 6,3, von Nicotinhydroxamsäure 3,7 und von Ascorbinsäure 2,7 mal höher als bei normalen.
    Notes: Summary 1. In normal and anemic rats, the retention of free and complex-bound 59Fe-iron was measured with a whole body counter 6 days after its oral administration. 2. If the iron is administered in the ionic form to iron-deficient rats they show a retention of iron 5 times greater than that of normal animals. The increased iron retention of anemic rats is diminished by all complexing agents tested. EDTA reduced it by 87%, citric acid by 40%, ascorbic acid by 32% and nicotine hydroxamic acid by 31%. 3. When the iron is combined with citric acid its retention by iron-deficient rats was 8.7 times increased in comparison to normal rats, with EDTA 6.3 times, with nicotine hydroxamic acid 3.7 and with ascorbic acid 2.7 times.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Clinical and experimental medicine 135 (1962), S. 534-540 
    ISSN: 1591-9528
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Zusammenfassung In zwei Versuchsgruppen von T.-vergifteten Ratten werden die präventive und kurative Wirkung von Re. geprüft. In einer dritten Versuchsgruppe wird an Hand von T.-vergifteten Ratten, die nicht mit Re. nachbehandelt wurden, der Frage spontan entstandener Granulome nachgegangen. Nach den tierexperimentellen morphologischen Ergebnissen dürfte dem Re. eine Leberschutzwirkung nicht abzusprechen sein. Das Re. verhindert zwar nicht den toxischen Leberschaden, aber es hemmt eindeutig die Gewebsschäden und fördert und unterstützt die Heilung solcher Schäden.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 151-152 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Corrosion Testing of Paints with the Aid of AerosolsIt is well known that opinions differ considerably about the value and usefulness of accelerated tests. On the other hand, it has been proved that the use of genuine aerosols for the corrosion testing of protective paints offers advantages as the testing technique is derived from the salt spray test. Spraying is not carried out by means of jets bat with the aid of suitably constructed aerosol as is used, for instance, in air conditioning. A 0,05 % solution of NaCl with a CO2 addition of 1 litre/hour is recommended as test medium. The corrosion test can be intensified by adding aggressive gases like CO2, HCl, NH3 and SO2.
    Notes: Bekanntlich gehen die Ansichten über Wert und Zweckmäßigkeit von Kurzzeitprüfungen stark auseinander. Dagegen ist erwiesen, daß die Verwendung echter Aerosole für die Korrosionsprüfung von Schutzanstrichen Vorteile bietet, wobei das Prüfverfahren den Methoden des Salzsprühtestes entstammt. Hierbei wird von einer Versprühung mit Düsen abgesehen und ein entsprechend konstruierter Aerosolapparat verwendet, wie er z. B. für die Raumlufterzeugung verwendet wird. Als Prüfmittel wird eine 0,05%-ige NaCl-Lösung mit einem CO2-Zusatz von 1 l/h empfohlen. Durch aggressive Gase wie CO2, HCl, SO2, NH3 läßt sich die Korrosionsprüfung verschärfen.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 11 (1960), S. 397-398 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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