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  • 1
    Electronic Resource
    Electronic Resource
    Purification and characterization of the pore forming protein of yeast mitochondrial outer membrane (1988)
    Springer
    European biophysics journal 15 (1988), S. 269-276 
    Details
    ISSN: 1432-1017
    Keywords: Ion-channel ; porin ; mitochondrial outer membrane ; lipid bilayer ; yeast mitochondria ; voltagedependence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract One of the major outer membrane proteins of yeast mitochondria was isolated and purified. It migrated as a single band with an apparent molecular weight of 30 kDa on a SDS-electrophoretogram. When reconstituted in lipid bilayer membranes the protein formed pores with a single channel conductance of 0.45 nS in 0.1 M KCl. The pores had the characteristics of general diffusion pores with an estimated diameter of 1.7 nm. The pore of mitochondrial outer membranes of yeast shared some similarities with the pores formed by mitochondrial and bacterial porins. The pores switched to substates at voltages higher than 20 mV. The possible role of this voltagedependence in the metabolism of mitochondria is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00256477
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  • 2
    Electronic Resource
    Electronic Resource
    Pedestrian approach to two-cocycles for unitary ray representations of Lie groups (1987)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 28 (1987), S. 2268-2279 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: Necessary and sufficient conditions for unitary ray representations of connected Lie groups are reexamined. Thus a systematic constructive method is obtained for calculating the admissible exponent factors (two-cocycles). The gauge freedom of the unitary ray representation formalism is also considered. This introduces the distinction between trivial and genuine ray representations. A special gauge is then adopted, within which the two-cocycle is almost unique. The only prerequisite of the exponent factor calculus is the knowledge of the binary combination rules for the essential parameters of the group. The attained method affords a simple, general, and explicit (i.e., coordinate-dependent) two-cocycle calculus. The aim of this paper is merely instrumental.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.527760
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  • 3
    Electronic Resource
    Electronic Resource
    Infinitesimal symmetry transformations. II. Some one-dimensional nonlinear systems (1985)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 26 (1985), S. 593-600 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: The converse problem of similarity analysis is discussed for the infinitesimal symmetry transformations of ordinary second-order differential equations which are nonlinear in x(overdot) (and may be linear or nonlinear in x). A natural classification of the problem arises, according to the highest order N of nonlinearity in x(overdot). The completely general maximal Lie algebra is obtained for the case N≤3. In the case N≥4 one has, besides the system of differential equations for the infinitesimal generators, an extra set of anholonomic constraints, which operates as a symmetry-breaking mechanism producing a strong reduction in the number of surviving parameters. Miscellaneous examples are given, which illustrate some features of similarity analysis of nonlinear systems. The infinitesimal point transformation symmetries of the Van der Pol oscillator are also briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.526595
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  • 4
    Electronic Resource
    Electronic Resource
    SL(3,R) as the group of symmetry transformations for all one-dimensional linear systems (1988)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 29 (1988), S. 9-15 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: The converse problem of similarity analysis is solved in general for the finite symmetry transformations of any inhomogeneous ordinary linear differential equation of the second order x¨+f2(t)x(overdot)+f1(t)x =f0(t). The eight-parameter realizations of the symmetry group are obtained in the form F−1P2 F, where F stands for transformations of (t,x) that depend exclusively on the fundamental solutions of the equation, and where P2 is an arbitrary projective transformation in the plane. Thus it is shown that the full point symmetry group corresponds to SL(3,R) indeed, without recourse to the Lie algebra. Also, a technique is obtained for calculating the finite point symmetry realization of SL(3,R) for any given one-dimensional linear system. Some miscellaneous examples are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.528139
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  • 5
    Electronic Resource
    Electronic Resource
    SL(3,R) as the group of symmetry transformations for all one-dimensional linear systems. II. Realizations of the Lie algebra (1988)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 29 (1988), S. 1746-1752 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: The two-dimensional space-time realizations of the Lie algebra of SL(3,R) are obtained, when the group acts as the maximal point symmetry group of any given one-dimensional Newtonian linear system. It is shown that these realizations are isomorphic with the realization of the Lie algebra of the projective group in the plane. Next an active point of view is introduced, and SL(3,R) is interpreted as a group of mappings that transform one admissible world line of the system into another. Thus a new mechanical realization of the sl(3,R) algebra comes to the fore. Some miscellaneous examples are included.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.527872
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  • 6
    Electronic Resource
    Electronic Resource
    X-ray crystallographic analysis of the structural distortions induced by substitution and annulation of the dodecahedrane nucleus (1989)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 45 (1989), S. 893-898 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270188013721
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  • 7
    Electronic Resource
    Electronic Resource
    Oligo-riboprobes (1988)
    Springer
    Histochemistry and cell biology 89 (1988), S. 481-483 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In situ hybridisation detection of mRNAs using riboprobes has become a widely used technique. However, the identification of cells producing closely-related yet distinct mRNAs is difficult with the usual size probes. More-over, it is not always easy to obtain the required cDNA essential for cRNA probe synthesis. To avoid these problems, we have used synthetic oligodeoxynucleotides to generate short, single stranded RNA probes (“oligo-riboprobes”). These probes can be labelled to very high (109 cpm/μg) specific activity and can be prepared for any published nucleotide sequence. We have used these probes to localise β (preprotachykinin) PPT mRNA producing neurons in rat hypothalamus and bowel. The results were compared to that obtained with cRNA probes generated from β preprotachykinin cDNA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00492605
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  • 8
    Electronic Resource
    Electronic Resource
    Negative phototaxis inDrosophila associated with a morphological change in the compound eye (1985)
    Springer
    Cellular and molecular life sciences 41 (1985), S. 611-612 
    Details
    ISSN: 1420-9071
    Keywords: Drosophila melanogaster subgroup ; phototaxis, negative ; eye, compound
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The ultrastructure of the compound eyes of several photonegative selection lines and their unselected photopositive controls of five species of themelanogaster subgroup was analyzed. A qualitative phenotypic change concerning the rhabdomeres in one of the photonegative selection lines ofD. mauritiana could be detected. It was proved that this structural aberration of the rhabdomeres is caused by a parallel mutation of the mutantora (outer rhabdomeres absent) ofD. melanogaster.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02007682
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  • 9
    Electronic Resource
    Electronic Resource
    Quantitative Bestimmungen mittels cyclischer Voltammetrie an der Phasengrenze zweier mischbarer Elektrolytlösungen (1989)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 335 (1989), S. 791-795 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary This paper presents some applications of cyclic voltammetry at the interface of two immiscible electrolyte solutions by means of an experimental set-up described in a former publication. When using special sample preparation good results are obtained for the determination of iodide and quinine in pharmaceutical products as well as for the determination of quinine in tonic water and dodecylsulfate in a tooth-salt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01204089
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  • 10
    Electronic Resource
    Electronic Resource
    Entwicklung eines universellen, preiswerten Interfaces zur Kopplung von Personal Computern mit Analysengeräten (1989)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 332 (1989), S. 839-843 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary This paper presents an expansion of the electronic interface I-O-16 described in some former publications. This new system makes it possible to link an experimental set-up for cyclic voltammetry at the interface between two immiscible electrolyte solutions and a personal computer. Thus the data recording is managed as well as the generation of the potential scan by the computer. A following mathematical treatment allows a numeric correction of the ohmic drop when using a special glass cell for the measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00635734
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