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  • 1990-1994  (16)
  • 1970-1974  (15)
  • 1991  (16)
  • 1971  (15)
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  • 1990-1994  (16)
  • 1970-1974  (15)
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  • 1
    Electronic Resource
    Electronic Resource
    Über substituierte 2-Amino-1-pyrroline, 3. Mitt.: rac.-3,3-Diphenylnoformicin und Derivate der 3,3-Diphenyl-2-aminopyrrolin-5-carbonsäure (1971)
    Springer
    Monatshefte für Chemie 102 (1971), S. 180-186 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract 5-Carboxyl-substituted 3.3-diphenyl-2-amino-1-pyrrolines are conveniently prepared by cycloaddition of α-acetaminoacrylic ester to diphenylacetonitrile. An alternative route, starting with the 4.4-diphenyl-4-cyano-2-bromobutyric acid derivatives1 b or1 d, results in poor yields owing to elimination of HBr during amination. Several amides of 3.3-diphenyl-2-aminopyrroline-5-carboxylic acid were prepared, including the β-carbamidinoethylamide (rac. diphenylnoformicin). Reduction of the ethyl ester2 f yields 3.3-diphenyl-2-amino-5-hydroxymethyl-1-pyrroline (3).
    Notes: Zusammenfassung 5-Carboxylsubstituierte 3,3-Diphenyl-2-amino-1-pyrroline werden vorteilhaft durch Cycloaddition von α-Acetaminoacrylester an Diphenylacetonitril hergestellt. Ein zweiter Syntheseweg, ausgehend von den 4,4-Diphenyl-4-cyan-2-brombuttersäurederivaten1 b oder1 d, verläuft wegen der HBr-Eliminierung während der Aminierung mit schlechten Ausbeuten. Es werden einige Amide der 3,3-Diphenyl-2-aminopyrrolin-5-carbonsäure (2 c), darunter das β-Carbamidinoäthylamid (rac. Diphenylnoformicin) (2 h) hergestellt. Die Reduktion des Äthylesters2 f führt zum 3,3-Diphenyl-2-amino-5-hydroxymethyl-1-pyrrolin (3).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00909227
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  • 2
    Electronic Resource
    Electronic Resource
    Acylderivate von 2-Amino-p-pyrrolinen (1971)
    Springer
    Monatshefte für Chemie 102 (1971), S. 627-634 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Acylierung von 2-Amino-3.3-diphenyl-5-methyl-1-pyrrolin (1) und 2-Amino-3.3-diphenyl-1-pyrrolin (2) erfolgt in den hier untersuchten Fällen am N-2-(exo)-Stickstoff. Die Umsetzung der cyclischen Amidine1 und2 mit BrCN gibt jedoch neben den N-2-(exo)-auch die N-1-(endo)-Cyanamidine. Diese werden in die entsprechenden Carbamoyl- und Thiocarbamoylamidine umgewandelt.
    Notes: Abstract Acylations of 2-amino-3.3-diphenyl-5-methyl-1-pyrroline (1) and 2-amino-3.3-diphenyl-1-pyrroline (2) occur at the N-2-(exo)-nitrogen. However, reaction of1 and2 with BrCN yields not only the N-2-(exo)-cyanoamidines but also the N-1-(endo)-isomers. Either is converted into the corresponding carbamoyl and thiocarbamoyl amidines.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00909361
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  • 3
    Electronic Resource
    Electronic Resource
    Semicyclische Carbamidinoamidine als potentielle Antidiabetica (1971)
    Springer
    Monatshefte für Chemie 102 (1971), S. 635-642 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Aus 2-Amino-1-pyrrolinen können durch bekannte Reaktionen stabile Carbamidinoderivate dargestellt werden. Die Addition von Bisbenzhydrylcarbodiimid an 2-Amino-1-pyrroline, gefolgt von saurer Abspaltung der Benzhydrylreste, stellt eine neue vorteilhafte Methode zur Herstellung der nor-Derivate dieser Verbindungsklasse (Tab. 2) vor. Einheitliche N2-Alkyl-und Arylsulfonylderivate dieser Reihe erhält man mit den 1-(N2-Sulfonylcarbamidino)-3.5-dimethylpyrazolen.
    Notes: Abstract Stable carbamidine derivatives of 2-amino-1-pyrrolines have been prepared using known reactions. The addition of bis-benzhydrylcarbodiimide to 2-amino-1-pyrrolines followed by acid cleavage of the benzhydryl moieties provides an improved method for the preparation of nor-derivatives of this class of compounds (Table 2). N2-Alkyl-and arylsulfonyl derivatives of this series have been selectively obtained from 1_(N2-sulfonylcarbamidino)-3.5-dimethylpyrazoles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00909362
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  • 4
    Electronic Resource
    Electronic Resource
    Das Vorkommen von «Myrosinase» als Hinweis auf die systematische Stellung der Batidaceae (1971)
    Springer
    Cellular and molecular life sciences 27 (1971), S. 1090-1091 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In accordance with the mustard-oil-containing families of the Capparidales ‘Myrosinase’ can be detected inBatis maritima. This observation suggests a relationship between Batidaceae and Capparidales also indicated by some morphological and anatomical data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02138900
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  • 5
    Electronic Resource
    Electronic Resource
    Buchbesprechungen (1971)
    Springer
    Naturwissenschaften 58 (1971), S. 223-224 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00591858
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  • 6
    Electronic Resource
    Electronic Resource
    Theb-boundary of tensor bundles over a space-time (1971)
    Springer
    Communications in mathematical physics 23 (1971), S. 285-295 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract In [1] it was shown how to attach a boundary to any space-time. In the present paper a boundary is constructed for any bundle associated with the frame bundle of a space time. In such a way limits of tensor fields at boundary points of a space-time are defined. Using this we show that the Lorentz metric has always a unique continuous extension to theb-boundary of the space-time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01893618
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  • 7
    Electronic Resource
    Electronic Resource
    Structures transmitting stimulatory force to the sensory hairs of vestibular ampullae of fishes and frog (1991)
    Springer
    Cell & tissue research 265 (1991), S. 567-578 
    Details
    ISSN: 1432-0878
    Keywords: Hair cells ; Stereocilia ; Cilia ; Cupula ; Rana riaibunda (Anura) ; Anguilla anguilla (Teleostei) ; Scardinius erythrophthalmus (Teleostei)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Serial sections of the vestibular ampullae of two species of fish and one species of frog were investigated by electron microscopy. The kinocilium is the only connection between the sensory cells and the auxiliary structure (cupula). The cupula possesses canals that traverse its entire height. Each canal contains a single kinocilium in its proximal part; distally, it is filled with material that stains with colloidal silver. The matrix of the cupula consists of filaments running perpendicular to the canals. These filaments do not stain with colloidal silver. The kinocilium is connected to the wall of the canal via structures that differ in the studied species of fish and frog. The filamentous links between the kinocilium and the longest stereovilli of the sensory hair bundle are similar in all the investigated species. The stereovilli are interconnected by basal and shaft links, and by horizontal and oblique tip connectors, similar to those described by other authors for macula organs and the organ of Corti, although differences in structural details, especially of the horizontal tip and the shaft connectors, are present. Some of these are species specific and some are related to the position of the sensory cell in the epithelium and/or specific to the organ (ampulla or macula organ). Some attachment sites of the links are associated with osmiophilic submembranous material. These differences in the structure, distribution and attachment sites of the links are possibly of functional importance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00340881
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  • 8
    Electronic Resource
    Electronic Resource
    A new definition of singular points in general relativity (1971)
    Springer
    General relativity and gravitation 1 (1971), S. 269-280 
    Details
    ISSN: 1572-9532
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract To any space time a boundary is attached on which incomplete geodesics terminate as well as inextensible timelike curves of finite length and bounded acceleration. The construction is free ofad hoc assumptions concerning the topology of the boundary and the identification of curves defining the same boundary point. Moreover it is a direct generalization of the Cauchy completion of positive definite Riemannian spaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00759538
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  • 9
    Electronic Resource
    Electronic Resource
    Gauge-invariant variations in the redshift and cosmic background radiation anisotropies (1991)
    Springer
    General relativity and gravitation 23 (1991), S. 1169-1194 
    Details
    ISSN: 1572-9532
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The gauge-invariance of the calculations determining anisotropics in the cosmic microwave background radiation (the Sachs-Wolfe effect) is re-examined. It is shown that the results obtained are gauge-invariant only if a physically-based definition of the surface of last scattering is implemented, in a context where perturbations of the surface of last scattering as well as of the space-time are taken into account. Any physical interpretation of the results based on their splitting into ‘scalar’, ‘vector’, and ‘tensor’ parts, is unique only if non-local (unverifiable) conditions are imposed; locally, any such interpretation is non-unique. The physical meaning of the Sachs-Wolfe potentialB and associated redshift formula depends on implementing a very specific gauge, without a clear physical or geometric meaning; its implications do not extend to other, more usual, gauges.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00757017
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  • 10
    Electronic Resource
    Electronic Resource
    Homogeneous Riemannian spaces and Lie algebras of Killing fields (1971)
    Springer
    General relativity and gravitation 2 (1971), S. 105-120 
    Details
    ISSN: 1572-9532
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The following new results are proved: (1) Every Riemannian space admitting a multiply transitive Lie algebra of Killing fields is locally isometric to a homogeneous Riemannian space. (2) For every closed connceted subgroupH 0 of the invariance group of a non degenerate quadratic form a homogeneous Riemannian space exists whose isotropy group containsH 0. (3) Necessary and sufficient conditions are derived for a Lie algebra $$\underset{\raise0.3em\hbox{$\smash{\scriptscriptstyle-}$}}{G} $$ to have a realization as multiply transitive Killing fields. These conditions are constructire in the sense that, for a given linear connected isotropy group, Lie algebras $$\underset{\raise0.3em\hbox{$\smash{\scriptscriptstyle-}$}}{G} $$ can be calculated algebraically, (4) It is shown how the Riemann tensor of a bomogencous space and its covariant derivatives can be expressed in terms of the metric at one point and the structure constants of the Lie algebra of Killing fields.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02450443
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