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  • 1
    Electronic Resource
    Electronic Resource
    Spin-wave resonance investigations of Ni-ion implanted Permalloy films : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 7004-7006 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Spin-wave resonance (SWR) has been applied to investigate the influence of Ni-ion implantation onto the magnetic properties of Permalloy films. The implantation has been carried out at room temperature with different doses at Ni-ion energies of 95 keV. In films of 30–60 nm thicknesses, which are thin compared to the implantation range, with increasing dose the uniform mode is shifted to higher resonance fields in the parallel configuration. In the perpendicular configuration one obtains a shift to lower fields. The corresponding variation of the effective magnetization as a function of the implantation dose could be reproduced by assuming a change of the average volume magnetization. In thicker films (150–250 nm) standing spin waves are excited which are only slightly modified by implantation compared to the as-prepared samples. The observed effects can be attributed to changes of the surface anisotropy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352412
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Prostatic acid phosphatase in the serially transplantable human prostatic tumor lines PC-82 and PC-EW (1990)
    Springer
    Urological research 18 (1990), S. 137-142 
    Details
    ISSN: 1434-0879
    Keywords: Nude mice ; Human prostatic tumor models ; PC-82 ; PC-EW ; Prostatic acid phosphatase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The correlation between tumor volume of untreated tumor-bearing nude mice and serum concentration of prostatic acid phosphatase (PAP/RIA) was studied in the hormone-dependent serially transplantable human prostatic tumor models PC-82 and PC-EW. The normal serum level of PAP in control male nude mice without tumor was found to be 0.9±0.3 ng/ml. Elevated PAP serum concentrations were never found in animals without tumor (a highly specific diagnostic technique). A close correlation was observed between the concentration of PAP in the serum (range 0.3 to 154 ng/ml) and the tumor volume (range 10.0 to 6, 530 mm3) of 104 untreated mice bearing a PC-82 or PC-EW human prostatic tumor. This correlation was comparable in both tumor lines (p〈0.001). The positive effect of endocrine manipulation which resulted in tumor diameter decrease or growth arrest with regressive histogical patterns, showed the normal PAP serum level, too. After successful treatment PAP was found to be normal, independent from the residual tumor mass. By contrast, in the event of only retarded tumor growth, the PAP level still correlated with the tumor burden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00302475
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Toward an understanding of the fluorescence intensity changes observed on fluorescein 5′-Isothiocyanate-Na+,K+-ATPase (1994)
    Springer
    Journal of fluorescence 4 (1994), S. 251-254 
    Details
    ISSN: 1573-4994
    Keywords: Fluorescence spectra ; fluorescence decay ; dissociation constants ; fluorescein 5′-isothiocyanate ; FITC-fluorescein 5′-isothiocyanate-Na+,K+-ATPase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The fluorescence emission intensity between the Na+, and the K+ complex of Na+,K+-ATPase, labeled with fluorescein 5′-isothiocyanate (FITC), differs by 30 to 40%. Experimental studies are carried out to elucidate the physical reasons which account this intensity difference. The dissociation constant of protolysis of the covalently bound FITC and its fluorescence decay times are determined in media of different ionic compositions and are compared with the corresponding properties of a synthetic model compound. The fluorophore bound to the protein is characterized by two decay times in the nanosecond range; the model compound, by a single one. The static fluorescence intensity changes are discussed on the basis of these results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01878459
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  • 4
    Electronic Resource
    Electronic Resource
    DEDO: A specific, fluorescent inhibitor for spectroscopic investigations of Na,K-ATPase (1994)
    Springer
    Journal of fluorescence 4 (1994), S. 287-290 
    Details
    ISSN: 1573-4994
    Keywords: Na,K-ATPase ; fluorescent inhibitor ; kinetics ; energy transfer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The interaction between the fluorescent ouabain derivative DEDO and purified renal Na,K-ATPase (isolated from different animal species) is investigated. Equilibrium binding studies provide a pK value of about 7.5 and a stoichoimetric coefficient of 1. Nonmodified ouabain exhibits the same affinity to the rabbit enzyme; the enzyme originating from the other sources binds DEDO 10 times less strongly than ouabain. Kinetic studies indicate that this is the consequence of a 10 times higher dissociation rate constant of the complexes formed with DEDO. The fluorescence emission intensity of DEDO is enhanced, being dependent on the enzyme source. The single decay time of DEDO is 3 ns in the absence and 21 ns in the presence of the rabbit enzyme and 14 ns in the presence of the pig renal enzyme. This result suggests that the fluorophore of DEDO is bound to a very hydrophobic environment of the enzyme. Further characterization of the static fluorescence spectra provides evidence for energy transfer between Trp residues of the enzyme and DEDO. Distance estimations suggest that one or two Trp residues are likely to be located in the proximity of the fluorophore.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01881441
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  • 5
    Electronic Resource
    Electronic Resource
    Fluorescence studies and semiempirical calculations on alkali ion indicators (1994)
    Springer
    Journal of fluorescence 4 (1994), S. 243-246 
    Details
    ISSN: 1573-4994
    Keywords: Cryptands ; alkali ion indicators ; pH sensitivity ; semiempirical calculations ; AM1
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Two newly synthesized cryptands act as sensitive Na+- and K+-selective indicators for cation concentrations above 20 μM. The fluorescence properties change markedly upon cation binding. In addition, the free ligands exhibit a pronounced sensitivity to pH, which is considerably lower for the cation complexes. Time resolved fluorescence is characterized by a decay time of about 5 ns that is attributed to the diprotonated protolytic state of the uncomplexed ligands. Semiempirical calculations show the systematic influence of the nitrogen lone pairs or the N−H bond on the stability of the system. The cause of the strong fluorescence intensity increase observed upon protonation of the fluorescent cryptands may be attributed to an increase in the S1−T x energy gap as a consequence of bridgehead nitrogen protonation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01878457
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    Paper (German National Licenses)
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