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  • SPACE RADIATION  (6)
  • Analytical Chemistry and Spectroscopy  (3)
  • Biochemistry and Biotechnology  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Intensification of mass transfer in aqueous two-phase systems (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 41 (1993), S. 72-78 
    Details
    ISSN: 0006-3592
    Keywords: aphrons ; aqueous two phase ; enzyme ; extraction ; intensification ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A novel technique which intensifies conventional aqueous two-phase extraction by conversion of dispersed phase into colloidal gas aphrons (CGAs) has been developed for extraction of an enzyme. In the present work, amyloglucosidase (1,4-α-D-glucan glucohydrolase) was extracted using a polyethylene glycol-sodium sulfate-water system. The lighter phase, i.e., polyethylene glycol (PEG) rich phase, was converted into CGAs which were then dispersed into a salt rich phase. The effect of type of surfactant and its concentration, dispersed phase velocity, phase composition, and type of sparger on the dispersed phase mass transfer coefficient was investigated. The results suggests 9-16 times higher values of mass transfer coefficient compared to spray column. The multiorifice sparger at concentrations of 0.33 g/L of cetyl trimethyl ammonium chloride yielded best results. © 1993 John Wiley & Sons, Inc.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260410110
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Indications of an indirect process in the double ionization of carbon disulphide (1988)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 2 (1988), S. 90-91 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290020506
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  • 3
    Electronic Resource
    Electronic Resource
    How are S2+· ions formed in electron collisions with linear S=C=S? (1989)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 3 (1989), S. 24-26 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The energetics of S2+· ion formation in electron dissociative ionization of linear CS2 are investigated experimentally with a crossed-beam apparatus. Ab initio self-consistent-field molecular orbital (SCF MO) calculations of potential energy curves for low-lying electronic states of this ion have been made in order to explain how stable S2+· ions are formed, initially at the very large internuclear separation of 3.2 Å.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290030204
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  • 4
    Electronic Resource
    Electronic Resource
    Active oxygen generation in γ-irradiated whole seedlings of Cicer arietinum L. (1994)
    New York : Wiley-Blackwell
    Journal of Bioluminescence and Chemiluminescence 9 (1994), S. 55-58 
    Details
    ISSN: 0884-3996
    Keywords: γ-irradiated seedlings ; weak luminescence ; singlet oxygen ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Whole seedlings of Cicer arietinum L. when exposed to 819 Gy γ-radiation, were found to emit ultraweak intensity luminescence. The phenomenon was oxygen-dependent, and the intensity of emission could be suppressed by post-irradiation treatment with catalase, superoxide dismutase, and ascorbic acid. Deuterium oxide and luminol amplified the emission intensity. These results suggest that singlet oxygen is a cause of the emission during the post-irradiation phase.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bio.1170090203
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  • 5
    Electronic Resource
    Electronic Resource
    Measurement of M-shell x-ray production cross-sections using 5.96-keV photons (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 20 (1991), S. 91-95 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: M-shell x-ray production/fluorescence (M XRF) cross-sections for five elements with 81 ≤ Z ≤ 92 were measured at 5.96-keV incident photon energy using thin targets. From the measured M XRF cross-sections the average M-shell fluorescence yields were derived. Experimental results for XRF cross-sections and fluorescence yields were compared with theory. The experimental results were found to be higher than the theoretical values by 10-17%. Further experimental investigations on M XRF cross-sections for more elements at different excitation energies are required in order to check the validity of the theoretical parameters used to calculate the M XRF cross-sections.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300200210
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  • 6
    Electronic Resource
    Electronic Resource
    The effect of a native collagen gel substratum on the synthesis of collagen by bovine brain capillary endothelial cells (1988)
    New York, NY [u.a.] : Wiley-Blackwell
    Cell Biochemistry and Function 6 (1988), S. 209-215 
    Details
    ISSN: 0263-6484
    Keywords: Endothelial cells ; Collagen synthesis ; Collagen matrix ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Cultured capillary endothelial cells, derived from bovine brain, and maintained on a plastic substratum synthesized predominantly interstitial collagens of which approximately 75 per cent were secreted into the medium. When grown on a native hydrated collagen type I gel, although no marked alteration in the ‘collagen synthetic pattern’ was observed, the overall level of collagen synthesis was increased by approximately 100 per cent. More dramatic, however, was the alteration in the distribution of these molecules between medium and cell layer. Interstitial collagens produced by cells grown on collagen gels were almost exclusively associated with the cell layer or collagenous gel. These studies, thus, demonstrate that an extracellular matrix may exert a considerable influence on the cellular synthetic activities and possibly cellular polarity of capillary endothelial cells.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cbf.290060310
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  • 7
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    Diurnal variation of galactic cosmic ray intensity on quiet days (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A detailed study of the diurnal variation on long term basis was performed on geomagnetically quiet days using the experimental data of the cosmic ray intensity from the worldwide neutron monitoring stations. During the period when the polarity of the solar magnetic field in the Northern Hemisphere of the sun is negative the phase and amplitude of the diurnal anisotropy on quiet days was observed to remain almost constant. When the polarity of solar magnetic field in the Northern Hemisphere changes from negative to positive, a shift in the phase of the diurnal anisotropy on quiet days towards earlier hours is observed and the shift is found to be maximum during minimum solar activity periods 1953-54 and 1975-76. When the polarity of solar magnetic field changes from positive to negative in the Northern Hemisphere of the Sun the phase of the diurnal anisotropy on quiet days recovers to its usual direction of corotational anisotropy and is observed to remain almost constant till the polarity of the solar magnetic field does not change.
    Keywords: SPACE RADIATION
    Type: SH-4.5-11 , 19th Intern. Cosmic Ray Conf - Vol. 5; p 126-129; NASA-CP-2376-VOL-5
    Format: application/pdf
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  • 8
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    Study of spectral exponent on quiet and disturbed days (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The spectral exponents of the diurnal and semidiurnal anisotropies are studied on quiet and disturbed days for a period from 1964 to 75. It has been observed for the diurnal anisotropy that the spectral exponent for quiet days is 0.0 from 1964 to 70, however during 1971 and onwards its value is found different from zero and is -0.4; for disturbed days the spectral exponent is observed to be 0.0 from 1964 to 75 with an exception of the year 1966. Further, it has been observed for the semi-diurnal anisotropy that the best value for the spectral exponent on quiet days being + 0.6 from 1964 to 74; however on disturbed days the value of spectral exponent is sometimes negative or positive but different from zero. It was derived from the present investigation that superimposed on the corotational anisotropy, expected from a balance between outward radial convection and inward field aligned diffusion, there is an additional component operating during the period under consideration.
    Keywords: SPACE RADIATION
    Type: SH-4.5-10 , NASA. Goddard Space Flight Center 19th Intern. Cosmic Ray Conf., Vol. 5; p 125
    Format: application/pdf
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  • 9
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    Comparative study of the phase of diurnal anisotropy on quiet and disturbed days on a long term basis up to recent period (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The data from the world wide grid of neutron monitoring stations was analyzed for a comparative study of the phase of diurnal anisotropy on quiet and disturbed days on a long term basis up to recent period. It has been observed that the phase of the diurnal anisotropy on disturbed days where the value of the Ap-index is higher, is found to shift towards earlier hours in comparison to the phase of the diurnal anisotropy on quiet days where the value of Ap-index is lower on all the stations from 1965 to 71. Such a trend is not observable for the later period. This affect is found to be more pronounced on equatorial stations, in particular, in comparison to high latitude stations. It was derived from these observational facts that the relationship between Ap-index and the phase of the diurnal anisotropy is not invariant throughout the period of consideration. Furthermore, the exact cause of such a drastic change is not known, but it demonstrates very clearly that the interplanetary conditions which are responsible for both, diurnal anisotropy of cosmic ray intensity and the geomagnetic Ap-index variation, have drastically changed during the period 1971 and onwards.
    Keywords: SPACE RADIATION
    Type: SH-4.5-9 , NASA. Goddard Space Flight Center 19th Intern. Cosmic Ray Conf., Vol. 5; p 124
    Format: application/pdf
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  • 10
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    Evidence for an interstellar or interplanetary source of diffuse He I 584 A radiation. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: SPACE RADIATION
    Type: Astrophysical Journal; 183; July 15
    Format: text
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