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  • 1
    Electronic Resource
    Electronic Resource
    Some characteristics of Ca2+ uptake by yeast cells (1980)
    Springer
    The journal of membrane biology 54 (1980), S. 149-156 
    Details
    ISSN: 1432-1424
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Summary Experiments were performed to obtain information on: (i) the specific properties of Ca2+ binding and transport in yeast (ii) the relationship between both parameters; (iii) similarities to or differences from other biological systems as measured by the effects of inhibitors; and (iv) the effects of mono and divalent cations, in order to get some insight on the specificity and some characteristics of the mechanism of the transport system for divalent cations in yeast. The results obtained gave some kinetic parameters for a high affinity system involved in the transport of Ca2+ in yeast. These were obtained mainly by considering actual concentrations of Ca2+ in the medium after substracting the amounts bound to the cell. Ak m of 1.9 μm and aV max of 1.2 nmol (100 mg·3 min)−1 were calculated. The effects of some inhibitors and other cations on Ca2+ uptake allow one to postulate some independence between binding and transport for this divalent cation. Of the inhibitors tested, only lanthanum seems to be a potent inhibitor of Ca2+ uptake in yeast. The effects of Mg2+ on the uptake of Ca2+ agree with the existence of a single transport system for both divalent cations. The actions of Na+ and K+ on the transport of Ca2+ offer interesting possibilities to study further some of the mechanistic properties of this transport system for divalent cations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01940568
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  • 2
    Electronic Resource
    Electronic Resource
    Lattices with a finite Whitman cover (1983)
    Springer
    Algebra universalis 16 (1983), S. 186-194 
    Details
    ISSN: 1420-8911
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01191767
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  • 3
    Electronic Resource
    Electronic Resource
    Bimeiosis induced by caffeine (1981)
    Springer
    Chromosoma 83 (1981), S. 241-248 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract A 0.1% caffeine solution has been injected into plants of rye at various stages of spike development. Cytokinesis was inhibited in the germ line, and the resulting binucleate cells underwent bimeiosis. Nuclear fusions occurred during cell divisions of the germ line, giving rise to mononucleate tetraploid PMCs which showed 14 bivalents instead of the expected up to 7 quadrivalents. A decrease in chiasma frequency was also noted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00286792
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  • 4
    Electronic Resource
    Electronic Resource
    Early sensitivity to colchicine in developing anthers of rye (1984)
    Springer
    Chromosoma 89 (1984), S. 121-126 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Plants injected with low concentrations of colchicine at very early stages of premeiotic development showed aneuploidy and slightly reduced chiasmate association at pollen mother cell (PMC) meiosis. With higher concentrations several tetraploid PMCs, reduced pairing, and both univalents and multivalents in diploid cells were found. The results suggest that meiotic chromosome pairing can be affected by colchicine treatment several mitotic cell generations before meiosis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00292895
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  • 5
    Electronic Resource
    Electronic Resource
    Automorphisms of representation finite algebras (1983)
    Springer
    Inventiones mathematicae 72 (1983), S. 359-362 
    Details
    ISSN: 1432-1297
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01398392
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  • 6
    Electronic Resource
    Electronic Resource
    The spin of the electron according to stochastic electrodynamics (1982)
    Springer
    Foundations of physics 12 (1982), S. 441-465 
    Details
    ISSN: 1572-9516
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract By making use of the method of moments we study some aspects of the statistical behavior of the nonrelativistic harmonic oscillator according to stochastic electrodynamics. We show that the random rotations induced on the particle by the zero-point field account for the magnitude of the spin of the electron, the result differing from the correct one(3/4)h 2 by a factor of2. Assuming that the measurement of a spin projection may be effectively taken into account by considering the action of only the subensemble of the field with the corresponding circular polarization, the calculated value of the spin projection comes out to be the correct one within a factor of order unity. The radiative corrections give rise to both the Lamb shift and the anomalous magnetic moment of the electron, the latter being evaluated to within a factor of2. The magnetic and gyromagnetic properties of the electron come out to be in agreement with quantum mechanics. Interference effects are shown to occur when evaluating the average value of the square of the angular momentum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00729994
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  • 7
    Electronic Resource
    Electronic Resource
    Does quantum mechanics accept a stochastic support? (1982)
    Springer
    Foundations of physics 12 (1982), S. 1017-1037 
    Details
    ISSN: 1572-9516
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Arguments are given in favor of a stochastic theory of quantum mechanics, clearly distinguishable from Brownian motion theory. A brief exposition of the phenomenological theory of stochastic quantum mechanics is presented, followed by a list of its main results and perspectives. A possible answer to the question about the origin of stochasticity is given in stochastic electrodynamics by assigning a real character to the vacuum radiation field. This theory is shown to reproduce important quantum mechanical results, some of which are presented explicitly to illustrate its potentialities. Finally the main problems and some perspectives of research within stochastic electrodynamics are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01889274
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  • 8
    Electronic Resource
    Electronic Resource
    Spectrofluorimetric determination of Ga(III) with 1-hydroxy-2-carboxyanthraquinone (1984)
    Springer
    Microchimica acta 84 (1984), S. 79-86 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Ein neues Verfahren zur fluorimetrischen Bestimmung von Ga(III) mit 1-Hydroxy-2-carboxyanthrachinon bei pH 3,9 in wäßrigem Ethanol wurde ausgearbeitet. Die Fluoreszenz wurde bei 580 nm gemessen (Anregung bei 465 nm). Das Verfahren eignet sich für 50–500 ng/ml. Die Zusammensetzung der Komplexverbindung entspricht dem Verhältnis 1∶1.
    Notes: Summary The fluorescent chelate formed between 1-hydroxy-2-carboxy-anthraquinone and gallium(III) at pH 3.9 has been studied spectrofluorimetrically in an ethanol-water mixture (70/30% V/V). A new method for the fluorimetric determination of gallium(III) is described. The fluorescence is monitored at 580 nm (wavelength of excitation 465 nm) and the range of application of the method is between 50 and 500 ng ml−1. The stoichiometry of the complex has been found to be 1∶1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01204159
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  • 9
    Electronic Resource
    Electronic Resource
    Palladium(II) and platinum(II) dichloro complexes containing diamine-estrone derivatives (1983)
    Springer
    Monatshefte für Chemie 114 (1983), S. 535-540 
    Details
    ISSN: 1434-4475
    Keywords: Diamine estrogenic complexes ; Palladium(II) complexes ; Platinum(II) complexes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wird über die Darstellung voncis-Dichlor-Pt(II)- undcis-Dichlor-Pd(II)-Komplexen mitN-[3-Hydroxyestra 1:3:5 (10)trien-17β]ethylendiamin,N-[3-Hydroxyestra 1:3:5 (10) trien-17β]1,3-propylendiamin undN-[3-Hydroxyestra 1:3:5 (10)trien-17β]2-aminomethylpyridin berichtet. Die Komplexe wurden mittels chemischer Analyse, IR und Leitfähigkeitsmessungen charakterisiert.
    Notes: Abstract The preparation ofcis-dichloro Pt(II) andcis-dichloro Pd(II) complexes ofN-[3-hydroxyestra 1:3:5 (10)trien-17β]ethylendiamine,N-[3-hydroxyestra 1:3:5 (10)trien-17β]1,3-propylendiamine, andN-[3-hydroxyestra 1:3:5 (10)trien-17β]2-aminomethylpyridine is reported. The complexes have been characterized by chemical analysis, infrared spectroscopy and molar conductivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00798607
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  • 10
    Electronic Resource
    Electronic Resource
    Kinetic studies on the formation of N-nitroso compounds (1984)
    Springer
    Monatshefte für Chemie 115 (1984), S. 155-163 
    Details
    ISSN: 1434-4475
    Keywords: Acetic acid/acetate ion buffer ; Kinetics of nitrosation ; Medium effect ; Morpholine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Essigsäure/Acetat-Puffer wirkt bei der Nitrosierung von Aminen katalytisch, unter Bedingungen, wo die alleinigen nitrosierenden Agentien N2O3 und NOBr sind; andererseits wird die Nitrosierung durch H2NO 2 + unterbunden. Die kinetischen Charakteristika dieses Phänomens wurden quantitativ analysiert und mit ähnlichen Effekten der LösungsmittelTHF, DMSO und Dioxan verglichen. Die experimentellen Ergebnisse zeigen, daß dieses Verhalten auf einen Mediumeffekt zurückzuführen ist.
    Notes: Abstract Acetic acid/acetate ion buffer acts catalytically upon the nitrosation of amines under conditions in which the only nitrosating agents are N2O3 and NOBr, but inhibits nitrosation by H2NO 2 + . The kinetic characteristics of these phenomena have been analysed quantitatively and compared with similar effects caused by the solventsTHF, DMSO and dioxane. The experimental results show that this behaviour is an effect of the medium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00798406
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