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  • molecular weight  (2)
  • 68.55  (1)
  • 81.40  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Control of molecular weight distribution of the biopolymer pullulan produced byAureobasidium pullulans (1993)
    Springer
    Journal of polymers and the environment 1 (1993), S. 3-9 
    Details
    ISSN: 1572-8900
    Schlagwort(e): Biopolymer ; pullulan ; polysaccharide ; molecular weight
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Energietechnik , Maschinenbau
    Notizen: Abstract The influence of carbon, nitrogen, and phosphate source, along with concentration, was determined for effect on the weight average molecular weight, molecular weight distribution, and yield of pullulan produced byAureobasidium pullulans NRRL-Y 6220. Batch systems, scale-up batch, and continuous fermentations of 1 L and 10 L were also evaluated as were processing variables, including solvents, and extraction conditions. Products with weight average molecular weight from 1.0 × 105 to 4.0 × 106 were produced in 100-g quantities by varying fermentation conditions such as constituents of the culture medium, pH, and length of incubation. Three sets of culture conditions were defined for the formation of low (〈5.0×105), medium (1.0–2.0×106), and high (〉2.0×106) weight average molecular weight polymer. These defined molecular weight fractions of pullulan were used in further studies in producing films and fibers.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01457648
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  • 2
    Digitale Medien
    Digitale Medien
    TEM analysis of the influence of dose on damage behavior in MeV Au2+-implanted silicon (1992)
    Springer
    Applied physics 54 (1992), S. 124-131 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 81.40 ; 61.70 ; 61.80
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract Extended lattice damage created by implantation of 3.6 MeV Au2+ ions has been investigated using transmission electron microscopy (TEM) and Rutherford backscattering spectrometry (RBS). Systematic observations of damage for Au2+ ions implanted with varying doses into silicon are explained in terms of a model. The origin of two distinct bands of extended defects is explained in terms of annealing of the central region of implant-damage, during the course of the implantation. Two distinct bands of Au precipitates are observed in high-dose implanted samples. This observation is explained as being the result, in part, of segregation of gold in front of a recrystallizing front, and in part, of gettering of dopant-atoms to nodes in a dislocation network. The network arises as a result of dynamic annealing of damaged crystalline silicon.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00323898
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  • 3
    Digitale Medien
    Digitale Medien
    TEM characterization of yttrium silicide layers synthesized by ion implantation (1992)
    Springer
    Applied physics 54 (1992), S. 527-532 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 61.10 ; 61.70 ; 68.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract The structure of Si implanted with high doses of yttrium has been investigated by varying implantation doses and energies. As implantation doses increase into the low 1017 cm−2 range, silicide precipitates form. The precipitates are thin and long and lie parallel to {111} planes in the Si matrix. As dopant concentrations increase, the precipitates themselves become more equiaxed, aspect ratios decrease, and precipitates densities increase until the precipitates coalesce to form a continuous buried layer of yttrium silicide within the Si matrix. The layer thickness is relatively uneven. As implant doses increase to ∼ 4×1017 cm−2, the layer thicknesses become more uniform although there are still defects present. As the implant doses increase further, the precipitate bands on either side of the continuous layer decrease due to gettering of yttrium to the layer. As the energy of the implant is increased, the appearance of the sample is similar to that of the lower energy implants except that the layer is buried deeper in the Si matrix. Observations of the silicide are consistent with its having the AlB2 structure with ordered vacancies on the Si sublattice.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00324334
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  • 4
    Digitale Medien
    Digitale Medien
    Continuous culture system for production of biopolymer levan using erwinia herbicola (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 38 (1991), S. 557-560 
    Details
    ISSN: 0006-3592
    Schlagwort(e): levan ; continuous culture ; molecular weight ; Erwinia herbicola ; Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: The optimal production of the fructan biopolymer levan by the bacterium Erwinia herbicola was investigated, including variations in nitrogen, carbon and phosphorous sources, pH, incubation time, culture yields up to 19% by weight produced based on conversion of sucrose as the carbon source when grown in a continuous culture system and processed by tangential flow filtration. Product identity was confirmed with gas chromatography (GC) and 13C nuclear magnetic resonance (NMR). Gel permeation chromatography (GPC) and low-angle laser light scattering (LALLS) determination of the molecular weight of the product showed a significant difference in molecular weight values dependent on the method of analysis. Analysis by GPC resulted in molecular weight one order of magnitude lower than LALLS independent of sample, underscoring the unusual nature of this biopolymer.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bit.260380515
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