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  • 1990-1994  (6)
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Materialart
Erscheinungszeitraum
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  • 1
    Digitale Medien
    Digitale Medien
    Statistical data analysis for gamma-ray astronomy (1990)
    Springer
    Experimental astronomy 1 (1990), S. 145-163 
    Details
    ISSN: 1572-9508
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Significance testing, parameter estimation and sensitivity calculations for γ-ray telescopes are discussed for single ‘on-off” astronomical observations. Four widely used significance test methods are examined by Monte-Carlo simulations. The Maximum Likelihood Ratio Method is found to consistently over-estimate the significance of an observation by a few percents whereas the Fisher's Exact Test is shown to be slightly conservative and always under-estimates the significance by about the same amount when the reported significance is about 3σ and therefore it is preferred for γ-ray astronomy applications. Two methods for constructing a confidence interval and an upper limit for γ-ray source counts are discussed. It is found that the method based on the Smooth Transformation provides slightly better estimations. A new formula for the calculation of the sensitivity of a γ-ray telescope is presented, in contrast to the widely accepted one, and their statistical meanings are explained in detail.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00462037
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  • 2
    Digitale Medien
    Digitale Medien
    The flocculation of bacteria using cationic synthetic flocculants and chitosan (1990)
    Springer
    Biotechnology techniques 4 (1990), S. 55-60 
    Details
    ISSN: 1573-6784
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Summary Bacteria are flocculated with high molecular weight cationic synthetic flocculants and chitosan. High charge density polymers are the most effective of the synthetic flocculants. Only chitosan is effective in flocculating the E. coli and B. subtilis cultures in complex broth. The difference in effectiveness between the synthetic flocculants and chitosan for flocculating E. coli, B. subtilis and Z. mobilis may be attributed to hydrogen bonding between the polysaccharide flocculant and cell surface polymers in addition to electrostatic interactions, and, in complex media, complexation of synthetic polymers with anionic polyelectrolytes.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00156611
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  • 3
    Digitale Medien
    Digitale Medien
    The effect of complex growth media on microbial flocculation by the cationic polyelectrolyte chitosan (1993)
    Springer
    Biotechnology techniques 7 (1993), S. 111-116 
    Details
    ISSN: 1573-6784
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Summary Flocculation of micro-organisms in their complex media is shown to be difficult. The natural cationic flocculant chitosan can successfully flocculate yeast from a complex broth. The difficulty caused by complex media is believed due to the flocculant preferentially complexing with anionic polymers in the media, rendering it ineffective as a flocculant.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00157380
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  • 4
    Digitale Medien
    Digitale Medien
    The strength of yeast flocs produced by the cationic flocculant chitosan: Effect of suspension medium and of pretreatment with anionic polyelectrolytes (1994)
    Springer
    Biotechnology techniques 8 (1994), S. 129-132 
    Details
    ISSN: 1573-6784
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Summary The strength of flocs formed by the chitosan induced flocculation of yeast depends on the nature of the suspending medium. The addition of anionic polymers to the medium prior to flocculation by the cationic polyelectrolyte chitosan can increase the resilience of the flocs.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00152853
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  • 5
    Digitale Medien
    Digitale Medien
    The role of cellulosics in chitosan flocculation of Zymomonas mobilis (1994)
    Springer
    Biotechnology techniques 8 (1994), S. 541-546 
    Details
    ISSN: 1573-6784
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Summary The flocs produced by an autoflocculent strain of Zymomonas mobilis are easily disrupted by gentle agitation. Treatment of a disrupted cell suspension with the flocculant chitosan yields less easily disrupted floes. The effectiveness of chitosan is attributed to the hydrogen bonding of the flocculant with the cell-bound and free cellulosic materials which facilitate polymer bridging and an electrostatic interaction between the cell wall and the flocculant.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00152142
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  • 6
    Digitale Medien
    Digitale Medien
    Improved separation of bacteria with a dual flocculant hydrocol™ system (1990)
    Springer
    Biotechnology techniques 4 (1990), S. 233-236 
    Details
    ISSN: 1573-6784
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Summary Polyelectrolyte flocculants are inefficient at flocculating Z. mobilis and B. subtilis in a complex medium, when administered singly or when combined with an oppositely charged polymer. However, when polymer dosing is followed by bentonite addition, particularly when chitosan constitutes the soluble polymer, effective flocculation occurs. High broth clarities can be attributed to chitosan interaction with cells, extracellular polymer and bentonite.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00158835
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