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  • 1
    Electronic Resource
    Electronic Resource
    Spinal cord injury-induced lesional expression of the repulsive guidance molecule (RGM) (2005)
    Oxford, UK : Blackwell Science Ltd
    European journal of neuroscience 21 (2005), S. 0 
    Details
    ISSN: 1460-9568
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The repulsive guidance molecule (RGM) is involved in the formation of the central nervous system (CNS) during development by modulating guidance of growing axons. However, a role of RGM in CNS injury remains to be established. We studied the expression of RGM in the spinal cord of rats with spinal cord injury (SCI). After SCI, RGM+ cells accumulated in lesions and peri-lesional areas. During the first days after SCI, RGM expression was confined to neurons, ballooned neurite fibers/retraction bulbs, smooth muscle/endothelial cells, and to leucocytes infiltrating the lesion. Lesional RGM expression was frequently confined to hypertrophic β-APP+ and RhoA+ neurites/retraction bulbs. With maturation of the lesion, we observed RGM expression by components of the developing scar tissue (cicatrix), such as fibroblastoid cells, reactive astrocytes and in addition a pronounced extracellular RGM deposition resembling neo-laminae. Frequent RGM+, RhoA+ coexpression by lesional retraction bulbs represent first preliminary evidence of RGM to exert growth inhibitory effects by the second messenger system RhoA. To date, RGM is one of the most potent axonal growth inhibitors identified and present in axonal growth impediments (i) oligodendrocytes; (ii) the plexus choroideus and (iii) components of the developing scar.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1460-9568.2005.03962.x
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  • 2
    Electronic Resource
    Electronic Resource
    Diphenylarsinoderivate des Maleinsäureanhydrids und verwandte Verbindungen. Kristall- und Molekülstruktur des 2,3-Bis(diphenylstibino)maleinsäureanhydrids (1980)
    Springer
    Monatshefte für Chemie 111 (1980), S. 177-191 
    Details
    ISSN: 1434-4475
    Keywords: Bis(diphenylarsino)maleic acid, derivatives ; Bis(diphenylstibino)maleic anhydride, synthesis, crystal structure ; Bis(phenylthio)maleic acid, derivatives ; Maleic acid derivatives, synthesis, molecular structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The unusual properties of bis(diphenylphosphino)maleic anhydride and similar ditertiary phosphines has prompted the synthesis of analogous arsines and stibines. Bis(diphenylarsino)maleic anhydride,-maleic thioanhydride and-N-methyl maleic imide, bis(diphenylstibino)maleic anhydride (5) and-maleic thioanhydride are obtained as crystalline yellow or red compounds by the reaction of the corresponding 2,3-dichloromaleic acid derivatives with diphenyl(trimethylsilyl)arsine and-stibine resp. The uv/vis spectra and characteristic i.r. bands of selected compounds are given and compared with those of the corresponding phosphines. The strong shift of νC=C to lower wavenumbers observed in all compounds has caused the determination of crystal and molecular structure of5 by x-ray diffraction. Bond distances and angles are given. The complex formation of the new diarsine ligands has been examined by the preparation of Ni-, Cr- and Mo-carbonyl derivatives. As the first organylsulfane substituted maleic acid derivatives bis(phenylthio)maleic thioanhydride,-N-methyl-maleic imide and-maleic acid dimethylester are synthesized and described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00938726
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  • 3
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    Unknown
    Swift's GULLIVER'S TRAVELS, I.ii (1983)
    Washington, etc. : Periodicals Archive Online (PAO)
    Explicator. 42:1 (1983:Fall) 18 
    Details
    ISSN: 0014-4940
    Topics: Linguistics and Literary Studies
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:1084-1983-042-01-000012
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  • 4
    facet.materialart.
    Unknown
    Die tote Maus oder Nachtrag zur 'moralischen Verwirrung der Zeit.' Schillers Urenkel in Thomas Manns "Doktor Faustus" (1984)
    Stuttgart, etc. : Periodicals Archive Online (PAO)
    Deutsche Vierteljahrsschrift für Literaturwissenschaft und Geistesgeschichte. 58:3 (1984:Sept.) 470 
    Details
    ISSN: 0012-0936
    Topics: German, Dutch and Scandinavian Studies
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:0088-1984-058-03-000007
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  • 5
    Electronic Resource
    Electronic Resource
    A perturbative description of coherent multiphoton resonant processes (1981)
    Springer
    Applied physics 24 (1981), S. 349-355 
    Details
    ISSN: 1432-0630
    Keywords: 42.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract We construct field equations and generalised Bloch equations for multiphoton processes involving the coherent interaction of a number of distinct electric fields with an arbitrary number of atomic eigenstates, and apply the equations to some physical examples. Transient stimulated hyper-Raman scattering, in the low-conversion regime and far from saturation, has been studied analytically. Assuming that the pump pulse interacts with the medium byn-photon absorption, we find expression for the intensity of the generated Stokes pulse.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00899733
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  • 6
    Electronic Resource
    Electronic Resource
    Struktur und Farbigkeit von P,P′-Tetra-t-butyl-und P, P′-Tetraphenyl-oxalsäurediphosphid und Derivaten (1980)
    Springer
    Monatshefte für Chemie 111 (1980), S. 749-759 
    Details
    ISSN: 1434-4475
    Keywords: Crystal structure ; Electronic transitions and structure ; Oxalic acid phosphides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The unexpected violet colour of P,P′-tetraphenyl-oxalic acid diphosphide (3) stimulated the synthesis of the following derivatives: P,P′-tetra-t-butyl-oxalic acid diphosphide (2), N,P-tetraphenyl-oxalic acid amide phosphide (4) and P, α-triphenyl-glyoxylic acid phosphide (5). The compounds could be prepared by the reaction of the corresponding acyl chlorides with diorganyl-(trimethylsilyl) phosphine; (organyl=t-butyl and phenyl). The electronic transitions of green-blue2 and red5 in the 450–700 nm region are discussed, also theirv C=O in the ir spectrum. These results are interpreted in connection with the molecule structures of2 and3 which have been determined by X-ray crystal structure analysis. In2 the framework P−C(O)−C(O)−P is only slightly distorted from a coplanartrans-position, in3 somewhat more. The bonds at P have the expected pyramidal arrangement. The direction of the lone pairs at the P-atoms, derived from this bond arrangement, is discussed with respect to the electronic transitions in acyl phosphides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00903328
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  • 7
    Electronic Resource
    Electronic Resource
    Analytic solutions for two-photon absorption in counterpropagating beams in the cubic approximation (1984)
    Springer
    The European physical journal 54 (1984), S. 263-269 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Exact stationary-state solutions of the cubic (unsaturated) nonlinearity model of degenerate two-photon absorption by counterpropagating beams are found, and are used to describe power limiting and multiple optical bistability within a Fabry-Perot etalon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01319192
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  • 8
    Electronic Resource
    Electronic Resource
    Separation of dihydrogenpolysulphides (polysulphanes) using reversed-phase HPLC (1984)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 318 (1984), S. 116-120 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary The reaction of Na2S n (from Na2S + S8) with SCl2 in anhydrous and deaerated alcohols (C1 to C5) yields polysulphanes, H2S n , which were identified by HPLC at a bonded C18 phase with methanol eluent, as well as by some typical reactions. Chain lengths up to n=16 were found. The H2S n decompose slowly under Ar, yielding H2S and sulphur homocycles S n−1. With alkali they are rapidly decomposed to H2S and S8. The retention of H2S n is much closer to that of the sulphur ring having the same sulphur atom number than to that of dialkylpolysulphide of comparable molecular size. The SH-groups cause only very little increase in solute solvophilic properties.
    Notes: Zusammenfassung Bei der Reaktion von Na2S n (aus Na2S + S8) in Alkoholen (C1 bis C5) mit SCl2 unter Argon entstehen Produkte, die aufgrund ihres Verhaltens bei der HPLC an einer C18-Phase mit rein methanolischem Eluens sowie durch einige Reaktionen als Polysulfane H2S n erkannt wurden. S-Ketten bis n=16 wurden gefunden. Die H2S n zersetzen sich unter Ar langsam zu H2S und Schwefelringen H2S n−1. Durch Alkali zerfallen sie sehr schnell in H2S und S8. Die Retention der H2S n ist der der Schwefelringe mit gleichem n viel ähnlicher als der etwa gleich großer Dialkylpolysulfide. Die SH-Gruppen haben nur einen sehr kleinen solvophilen Effekt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00533679
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  • 9
    Electronic Resource
    Electronic Resource
    The retention of sulphur homocycles in reversed-phase HPLC (1984)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 318 (1984), S. 327-334 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Schwefelringe bis etwa S25 können an gebundenen C8- und C18-Phasen mit Methanol/H2O als Eluens getrennt werden. Für Ringe ab S15 verwendet man besser Methanol-Alkan-Gemische. In reinem Methanol haben S-Ringe eine wesentlich größere Retention als Alkane gleicher molekularer Oberfläche. Dies wird erklärt durch eine zusätzliche Wechselwirkung der Alkane mit den Methylprotonen des Eluens. Bei zunehmendem H2O-Gehalt im Eluens verliert diese Wechselwirkung an Bedeutung, und die Retentionen von S-Ringen und Alkanen gleichen sich einander an. Die Sorptionswärmen der S-Ringe und Alkane sind schon in 100% Methanol negativ und werden bei zunehmendem Eluenswassergehalt noch negativer. Die Sorptionsentropien sind ebenfalls meist negativ. Dies wird durch die Annahme eines hoch geordneten „Sorptionskomplexes“ aus gebundener Phase, Sorbat und Eluens erklärt.
    Notes: Summary Sulphur homocycles up to S25 can be separated on C8 and C18 bonded phases using methanol/water eluents. For rings larger than about S15 methanol-alkane eluents should be used. In 100% MeOH the retention of S-rings is larger than that of alkanes having the same molecular surface area, which can be explained by an additional interaction of the alkanes with the methyl groups of the eluent. If water is added to the eluent, the sulphur and alkane retentions approach each other. The heat of sorption of S-rings and alkanes are more negative the higher the eluent water content. The sorption entropies are mostly negative which indicates the existence of a highly ordered “sorbed complex” which is thought to consist of bonded phase, sorbed solutes and eluent molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00538723
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  • 10
    Electronic Resource
    Electronic Resource
    Retentionsverhalten von Stoffen geringer Polarität an chemisch gebundenen Umkehrphasen und seine Beschreibung durch Konnektivitätsfunktionen (1981)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 308 (1981), S. 401-412 
    Details
    ISSN: 1618-2650
    Keywords: Trenn. von Alkanen ; Chromatographie, HPLC ; Retentionsmodell
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Ein einfaches Retentionsmodell, das Adsorptions- und Verteilungseffekte berücksichtigt, wird auf acyclische Alkane angewandt. Die Dispersionskomponenten der Oberflächenenergien von gebundener Phase und Eluens als Systemparameter werden gemessen. Die Retentionswerte sind bestimmt durch Aktivitätskoeffizienten der Soluten im Eluens, das Verhältnis der Aktivitätskoeffizienten der Soluten im sorbierten und im freien Eluens, den Sorptionsflächenbedarf der Soluten und ihre Oberflächenenergien. Die drei erstgenannten Parameter sind mit der molekularen Oberfläche der Soluten korreliert. Sie lassen sich durch Konnektivitätsfunktionen in befriedigendem Maße approximieren. Die Selektivität eines Umkehrphasensystems gegenüber Alkanen wird bei höherem Wassergehalt im Eluens hauptsächlich durch Aktivitätskoeffizienten bestimmt. Bei sehr geringem Wassergehalt gewinnt der Sorptionsflächenbedarf zunehmend an Bedeutung.
    Notes: Summary A simple retention model involving adsorption as well as partition effects is applied to non-cyclic alkanes. The dispersion component of surface energies of bonded phase and eluent are measured. Retention is influenced by the activity coefficients of solutes in the bulk and the sorbed eluent phase, the sorption area and the surface energy of the solutes. Sorption area and activity coefficients are correlated to the molecular surface of the solutes. This can be approximated using connectivity functions. The selectivity of a reversed phase system towards alkanes strongly depends on the water content in the eluent. At higher water content the activity coefficients play the dominant role; at very low water content the sorption area values become more important.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00466075
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