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  • 1
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    EARLY AGRICULTURE IN WESTERN CANADA IN RELATION TO CLIMATIC STABILITY (1952)
    Chicago : Periodicals Archive Online (PAO)
    Agricultural History. 26:3 (1952:July) 104 
    Details
    ISSN: 0002-1482
    Topics: History , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:3013-1952-026-03-000005
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    Paper (German National Licenses)
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  • 2
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    THE ALBERTA WET CYCLE OF 1899-1903: A CLIMATIC INTERLUDE (1954)
    Chicago : Periodicals Archive Online (PAO)
    Agricultural History. 28:3 (1954:July) 112 
    Details
    ISSN: 0002-1482
    Topics: History , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:3013-1954-028-03-000003
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Resistance of biofilms to the catalase inhibitor 3-amino-1,2,4-triazole (1998)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 59 (1998), S. 156-162 
    Details
    ISSN: 0006-3592
    Keywords: Pseudomonas aeruginosa ; Pseudomonas fluorescens ; Klebsiella pneumoniae ; 3-amino-1,2,4-triazole ; catalase ; hydrogen peroxide ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Consortia of catalase positive bacteria consisting of Pseudomonas aeruginosa, Pseudomonas fluorescens, and Klebsiella pneumoniae, in both the planktonic form and as biofilms, disproportionate hydrogen peroxide into oxygen and water. The biofilm, however, continued to disproportionate the hydrogen peroxide in the presence of the catalase inhibitor, 3-amino-1,2,4-triazole, while the planktonic organisms did not. While the bacterial catalase-peroxidase-dismutase system was probably responsible for the disproportionation of hydrogen peroxide in both cases, biofilms resisted inhibition of this enzyme system. © 1998 John Wiley & Sons, Inc. Biotechnol Bioeng 59: 156-162, 1998.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 4
    Electronic Resource
    Electronic Resource
    Diffusivity of Cu2+ in calcium alginate gel beads (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 41 (1993), S. 755-760 
    Details
    ISSN: 0006-3592
    Keywords: biopolymers ; metal binding ; polymer-metal binding ; calcium alginate beads ; copper binding ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A linear absorption model (LAM) is used to describe the process of metal binding to spherically shaped biopolymers particles. The LAM was solved using a numerical algorithm which calculates diffusivities of metal ion in biopolymer gels. It assumes attainment of rapid metal-biopolymer binding equilibrium accompanied by rate limiting diffusion of the metal ions through the gel. The model was tested using batch experiments in which copper (Cu2+) binding with calcium alginate beads was investigated. Biopolymer density in the beads was varied between 2% and 5%. The diffusion coefficient of Cu2+ calculated from the LAM ranged from 1.19 × 10-9 to 1.48 × 10-9 m2 s-1 (average 1.31 ± 0.21 × 10-9 m2 s-1), independent of biopolymer density. The LAM has theoretical advantages over the shrinking core model (shell progressive model). The latter calculated an unreasonable exponential increase in the diffusion coefficient as density of alginate polymer in the bead increased. © 1993 John Wiley & Sons, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260410710
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  • 5
    Electronic Resource
    Electronic Resource
    Effects of biofilm structures on oxygen distribution and mass transport (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 43 (1994), S. 1131-1138 
    Details
    ISSN: 0006-3592
    Keywords: confocal microscopy ; microelectrodes ; cell clusters ; pores ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Aerobic biofilms were found to have a complex structure consisting of microbial cell clusters (discrete aggregates of densely packed cells) and interstitial voids. The oxygen distribution was strongly correlated with these strutures. The voids facilitated oxygen transport from the bulk liquid through the biofilm, supplying approximately 50% of the total oxygen consumed by the cells. The mass transport rate from the bulk liquid is influenced by the biofilm structure; the observed exchange surface of the biofilm is twice that calculated for a simple planar geometry. The oxygen diffusion occurred in the direction normal to the cluster surfaces, the horizontal and vertical components of the oxygen gradients were of equal importance. Consequently, for calculations of mass transfer rates a three-dimensional model is necessary. These findings imply that to accurately describe biofilm activity, the relation between the arrangement of structural components and mass transfer must be undrstood. © 1994 John Wiley & Sons, Inc.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260431118
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Resistance of biofilms to the catalase inhibitor 3-amino-1,2,4-triazole (1998)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 60 (1998), S. 135-135 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: No abstract.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
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