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  • 1975-1979  (195)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    C-20 Hydrocarbons of butterfat (1975)
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 23 (1975), S. 20-24 
    Details
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jf60197a014
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  • 2
    Electronic Resource
    Electronic Resource
    Thiolato and selenido complexes of rhodium(III) (1977)
    s.l. : American Chemical Society
    Inorganic chemistry 16 (1977), S. 437-440 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic50168a043
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  • 3
    Electronic Resource
    Electronic Resource
    Preparation and properties of three specific active derivatives of ribonuclease A obtained by methylation of methionine residues in 8 M urea (1975)
    s.l. : American Chemical Society
    Biochemistry 14 (1975), S. 3476-3481 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00686a029
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  • 4
    Electronic Resource
    Electronic Resource
    Temperature-jump experiments on thin lipid membranes in the presence of valinomycin (1977)
    Springer
    The journal of membrane biology 37 (1977), S. 13-28 
    Details
    ISSN: 1432-1424
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Summary Temperature jump relaxation experiments on planar lipid membranes in the presence of valinomycin were performed using the absorption of a strong light flash as an energy source for the generation of the T-jump. The relaxation of the current carried by valinomycin/Rb+ complexes was measured. The results were interpreted on the basis of a transport model which was also analyzed by voltage jump relaxation experiments. The study shows that the application of the T-jump technique provides valuable information about transport kinetics as well as the dynamics of the membrane structure. At the given experimental conditions the relaxation of the current is believed to reflect a temperature-dependent transition of the membrane to a new conformational state of lower order. The relaxation could be resolved with the present technique only at low temperatures and for membranes of high microviscosity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01940921
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  • 5
    Electronic Resource
    Electronic Resource
    An extended kinetic analysis of valinomycin-induced Rb-transport through monoglyceride membranes (1975)
    Springer
    The journal of membrane biology 25 (1975), S. 249-270 
    Details
    ISSN: 1432-1424
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Summary The time course of the current following a voltage jump, which is applied to monoglyceride bilayers in the presence of valinomycin, shows two relaxation times. This is basically in agreement with a simple carrier model which has been described in full detail formerly. Relaxation times and amplitudes allow a calculation of the rate constants of the transport model. The presented data supplement an analysis which was hitherto based only on the slower relaxation process and on information derived from the nonlinearity of currentvoltage characteristics. The additional resolution of the faster relaxation time allowed an approximate determination of the voltage dependence of the translocation rate constant for the carrier-ion-complex and provided evidence for a small voltage dependence of the interfacial reaction. The dependence of the relaxation parameters on the ion concentration in the aqueous phase was interpreted assuming a saturation of the ion concentration at the reaction plane at high bulk concentrations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01868578
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  • 6
    Electronic Resource
    Electronic Resource
    Spectral selectivity of visual response alterations mediated by interconversions of native and intermediate photopigments inDrosophila (1975)
    Springer
    Journal of comparative physiology 96 (1975), S. 343-356 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Recent studies have indicated that intense short wavelength stimulation in flies converts rhodopsin to a longlived metarhodopsin while decreasing visual sensitivity and electroretinographic (ERG) responsivity. Long wavelength stimulation reverses both visual pigment and ERG alterations. In this study of ERG's in white-eyedDrosophila, spectral sensitivities were obtained following intense visible and ultraviolet short wavelength stimuli. Both stimuli decreased sensitivity to all wavelengths while ultraviolet light also selectively decreased ultraviolet sensitivity (Fig. 1). These results isolated three sensitivity components contributing to the ERG in flies: (1) the dark adapted sensitivity (Fig. 1); (2) the residual sensitivity remaining subsequent to intense ultraviolet stimulation (Fig. 1); and (3) the ultraviolet sensitivity specifically abolished by intense ultraviolet stimulation (Fig. 2). Further evidence shows that the three components are probably receptor-specific; the first two resemble recent fly receptor spectral sensitivity data (e.g. Eckert, 1971) while the third represents a separate ultraviolet receptor. Linear reciprocity of time and intensity to alter the ERG responsivity was found over considerable ranges for long wavelength (Fig. 3) and short wavelength (Fig. 4) induced responsivity alterations. ERG action spectra were obtained for altering responsivity (Fig. 5). The action spectrum for decreasing responsivity was roughly parallel with the dark adapted spectral sensitivity for wavelengths below 500 nm. The action spectrum for reestablishing responsivity had a peak near 570 nm and agreed with previous determinations of spectral characteristics of fly metarhodopsin. The action spectra determined were probably based on photopigment interconversions in the 1–6 receptor system. Long wavelength reconversion of metarhodopsin to rhodopsin may explain the high ultraviolet and low red sensitivities and the functional significance of red eye color pigments in flies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00619224
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  • 7
    Electronic Resource
    Electronic Resource
    Genetic recombination in the major histocompatibility complex (H-1, Ag-B) of the rat (1977)
    Springer
    Immunogenetics 5 (1977), S. 183-187 
    Details
    ISSN: 1432-1211
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01570474
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  • 8
    Electronic Resource
    Electronic Resource
    Specific field emission properties of thin palladium films (1976)
    Springer
    Applied physics 10 (1976), S. 265-268 
    Details
    ISSN: 1432-0630
    Keywords: 79.40 ; 73
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The field emission current from thin palladium films deposited on insulating tips in UHV was measured as a function of film thickness at relatively low field strengths. The observed periodic oscillations of the field emission current can be interpreted as the quantum size effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00897226
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  • 9
    Electronic Resource
    Electronic Resource
    Optical and electrical studies on dansyllysine-valinomycin in thin lipid membranes (1976)
    Springer
    European biophysics journal 2 (1976), S. 119-137 
    Details
    ISSN: 1432-1017
    Keywords: Valinomycin ; Lipid membranes ; Fluorescence ; Relaxation methods
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Summary Dansyllysine-valinomycin, a fluorescent analogue of the ionophore valinomycin was synthesized and incorporated into black lipid membranes. Its concentration inside the membrane was measured fluorometrically and was also determined from electrical relaxation experiments, which were analyzed on the basis of a previously proposed carrier model. The results of both methods agreed within less than one order of magnitude. This appears satisfactory in view of the sources of error inherent in both procedures. A conductance increment per carrier molecule of about 3 · 10−17 Ω−1 was obtained for dansyllysine-valinomycin in diphytanoyllecithin membranes at 25
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00863705
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  • 10
    Electronic Resource
    Electronic Resource
    Photopigment and receptor properties in Drosophila compound eye and ocellar receptors (1979)
    Springer
    European biophysics journal 5 (1979), S. 197-209 
    Details
    ISSN: 1432-1017
    Keywords: Visual pigments ; Invertebrate neurobiology ; Membrane biophysics ; Retina
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract A review of the spectral sensitivity and the rhodopsin and metarhodopsin characteristics in three compound eye receptor types (R1–6, R7, and R8) and ocellar receptors is presented (Fig. 1). Photopigment properties were determined from measures of conversion efficiency. The photopigments of R1–6 were studied using in vivo microspectrophotometry in the deep pseudopupil of white-eyed flies. These studies yielded a refined estimate of the R1–6 metarhodopsin spectrum (Fig. 2). The quantum efficiency relative to the spectral sensitivity estimate of the rhodopsin spectrum was factored out. The quantum efficiency of rhodopsin is about 1.75 times that of metarhodopsin. The peak absorbance of metarhodopsin was estimated to be about 2.6 times that of rhodopsin. The mechanism of the two-peaked R1–6 spectral sensitivity and metarhodopsin spectrum is discussed in terms of evidence that there is only one rhodopsin in R1–6 and that vitamin A deprivation preferentially lowers ultraviolet sensitivity. The prolonged depolarizing afterpotential is reviewed from the standpoint of the internal transmitter hypothesis of visual excitation. A careful comparison of the intensity-responsivity for photopigment conversion and its adaptional consequences is made (Fig. 3).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00535448
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