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  • 1
    Electronic Resource
    Electronic Resource
    Geochemical trends in the Belgian Ardennes (1975)
    Springer
    Mineralium deposita 10 (1975), S. 121-127 
    Details
    ISSN: 1432-1866
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The paper summarizes the results of a regional geochemical survey in the Belgian Ardennes. Various geochemical trends are defined and tentatively interpreted; a possible relation between geochemical and metallogenic zoning is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00206527
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  • 2
    Electronic Resource
    Electronic Resource
    Intracellular microelectrode membrane potential measurements in tobacco cell-suspension protoplasts and barley aleurone protoplasts: interpretation and artifacts
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Biomembranes 1193 (1994), S. 77-84 
    Details
    ISSN: 0005-2736
    Keywords: (H. vulgare) ; (N. tabacum) ; Auxin ; Membrane potential ; Microelectrode
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0005-2736(94)90335-2
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  • 3
    Electronic Resource
    Electronic Resource
    Inference processes in learning well-defined concepts
    Amsterdam : Elsevier
    Acta Psychologica 51 (1982), S. 181-205 
    Details
    ISSN: 0001-6918
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Psychology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0001-6918(82)90034-8
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Solution conformations of nucleoside analogues exhibiting antiviral activity against human immunodeficiency virus
    Amsterdam : Elsevier
    Journal of Molecular Structure 242 (1991), S. 283-301 
    Details
    ISSN: 0022-2860
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0022-2860(91)87142-5
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Über Wesen und Ursache der Notatmung (1933)
    Springer
    Journal of comparative physiology 19 (1933), S. 666-672 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung 1. In Übereinstimmung mit früheren Autoren wird gezeigt, daß Notatmung einerseits auftritt bei einem Sauerstoffgehalt des Wassers von 0, 7 ccm pro Liter (bei normaler, das heißt ganz niedriger Kohlensäurespannung), und andererseits bei einer Kohlensäurespannung von 4 bis 5% (bei normalem Sauerstoffgehalt, also 6–8 ccm O2 pro Liter). 2. Die beiden Reize, Sauerstoffmangel und erhöhte Kohlensäurespannung, verstärken einander gegenseitig, was am einfachsten so erklärt werden kann, daß beide auf dieselbe Ursache:pH-Erniedriguhg des Atemzentrums, zurückzuführen sind. Die Erfahrung, daß nicht derph, sondern die Kohlensäurespannung des Atemwassers entscheidend ist, steht mit dieser Hypothese nicht im Widerspruch. 3. Wenn sich über dem Wasser keine Luft, sondern eine sauerstoffarme bzw. kohlensäurereiche Gasmischung befindet, wird die Notatmung immer wieder für kurze Zeit unterbrochen. 4. Die biologische Bedeutung der Notatmung ist vor allem darin zu erblicken, daß das Tier die oberflächliche, sauerstoffreichere bzw. kohlensäureärmere Wasserschicht zur Atmung verwendet. Daß die an die Luft grenzende Schicht einer sauerstoffarmen Wassermenge in der Tat beinahe doppelt soviel Sauerstoff enthält wie die unteren Schichten, wird durch Mikroanalysen bewiesen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00395647
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Hydrothermal activity at Hook Ridge in the Central Bransfield Basin, Antarctica (1999)
    Springer
    Geo-marine letters 18 (1999), S. 277-284 
    Details
    ISSN: 1432-1157
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  Hydrothermal activity in the Central Bransfield Basin revealed an active low-temperature vent field on top of a submarine volcanic structure. A temperature anomaly was detected and the sea floor showed various patches of white silica (opal-A) precipitate exposures and some yellow–brown Fe-oxyhydroxide crusts. Enriched dissolved methane concentrations were encountered. Sediment was near 24°C just after the grab came on deck. No dense population of chemosynthetically based macrofauna known from other hydrothermal venting areas was present, except for pogonophora. The observations suggest that the sedimented hydrothermal field at Hook Ridge is a low-temperature end-member branch from a deeper hydrothermal source.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003670050080
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Effects of dinitrophenol on active-transport processes and cell membranes in the Malpighian tubule of Formica (1994)
    Springer
    Pflügers Archiv 428 (1994), S. 150-156 
    Details
    ISSN: 1432-2013
    Keywords: Malpighian tubule ; Formica ; Electrophysiology ; Cable analysis ; Dinitrophenol ; Protonophore
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In Formica Malpighian tubules KCl secretion is driven by a V-type H+ ATPase in the luminal membrane in parallel with a H+/K+ antiporter. The effect of the protonophore dinitrophenol (DNP) was investigated on the isolated, symmetrically perfused tubule. DNP was applied in two different concentrations: 0.2 mmol/l and 1 mmol/l. The effects were fast and rapidly reversible. The equivalent short-circuit current (I sc) was reduced significantly to respectively 25±3% Cn=4) and −3±7% (n=11) of the control value when 0.2 mmol/ l or 1 mmol/l was added to the bath. When 1 mmol/l DNP was applied the transepithelial resistance (R te) decreased significantly to 74±11% of the control value (n=11), and the luminal over basolateral voltage divider ratio (VDR), providing an estimate of luminal over basolateral membrane resistance, decreased to 37±12% of the control (n=6). A concentration of 1 mmol/l DNP was also applied from the lumen. The decrease in I sc was significant, but much less pronounced (74±5% of control; n=6) and no significant changes in R te and VDR were observed. It is argued that, when the concentration in the bath is high enough, DNP may cross the cell and have a protonophoric effect not only on the mitochondria but also across the luminal cell membrane explaining the drop in transepithelial and in relative luminal membrane resistance. The diminished effectiveness of DNP, when applied from the luminal side, suggests that the luminal membrane is somehow less permeable to toxic substances, but that DNP very rapidly enters the cell via the basolateral membrane and may bring about an initial protonophoric effect across this membrane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00374852
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  • 8
    Electronic Resource
    Electronic Resource
    The development of the representation of conceptual knowledge in memory and the design of instruction (1988)
    Springer
    Instructional science 17 (1988), S. 339-350 
    Details
    ISSN: 1573-1952
    Source: Springer Online Journal Archives 1860-2000
    Topics: Education
    Notes: Abstract Knowledge comprises facts, concepts and principles. Skills are categorized as either cognitive or motor skills, which are essential for solving problems. The acquisition of knowledge and skills is guided by instructions and by presenting problems to students. Firstly, the instructions for acquiring concepts, based on principles, are discussed and a model for teaching is presented. Further, the integration of class and relational concepts, together with principles, is shown to be necessary for solving problems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00056220
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  • 9
    Electronic Resource
    Electronic Resource
    Abscisic acid-induced gene-expression requires the activity of protein(s) sensitive to the protein-tyrosine phosphatase inhibitor phenylarsine oxide (1996)
    Springer
    Plant growth regulation 18 (1996), S. 115-123 
    Details
    ISSN: 1573-5087
    Keywords: abscisic acid ; barley aleurone ; gene-expression ; phosphatase inhibitor ; phosphorylation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Abscisic acid-induced gene-expression requires the activity of protein(s) sensitive to the protein-tyrosine phosphatase inhibitor phenylarsine oxide. It is generally accepted that phosphorylation/dephosphorylation of proteins plays an important role in signal transduction cascades. evidence is now accumulating that for plants the same holds true. To study the role of phosphorylation in ABA signal transduction, we used six different compounds which were reported to inhibit phosphatase action. Three of these inhibitors: phenylarsine oxide (PAO), Calyculin A (CA) and Okadaic Acid (OA) appeared capable of inhibiting ABA-induced gene-expression. The same three inhibitors are shown to bring about hyperphosphorylation of two approximately 40 kDa proteins, present in the membrane-bound fraction of barley aleurone cells. The other three inhibitors had no visible effect on the phosphorylation status of the barley proteins. The hyperphosphorylation of the two 40 kDa proteins coincided with an increase of tyrosine-phosphorylation of two 40 kDa proteins with different pI, as determined with anti-phosphotyrosine antibodies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00028496
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    The effect of intracellular pH on the regulation of the Rab 16A and the α-amylase 1/6-4 promoter by abscisic acid and gibberellia (1995)
    Springer
    Plant molecular biology 27 (1995), S. 815-820 
    Details
    ISSN: 1573-5028
    Keywords: α-amylase-promoter ; abscisic acid-induced gene expression ; gibberellin-induced gene expression ; intracellular pH ; Rab promoter ; transient expression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Intracellular pH (pHi) of barley aleurone cells is known to be affected by hormones and plant growth conditions. The possible mechanisms by which these pHi shifts influence the actions of abscisic acid (ABA) or gibberellin (GA) is being investigated. Here we report an attempt to study the effect of pHi on hormone-induced gene expression. We used weak acids and weak bases to artificially mimic the pHi changes brought about by ABA and GA and found that chloramphenicol acetyltransferase (CAT) expression controlled by the Rab promoter was affected while the α-amylase promoter seemed insensitive. CAT fused to the 35S promoter was used as a control which is not inducible by ABA or GA3. The expression of this construct was not significantly affected by artificial pHi changes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00020234
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