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  • Electronic Resource  (14)
  • 11
    Electronic Resource
    Electronic Resource
    Screening of hexavalent chromium biosorbent from marine algae (2000)
    Springer
    Applied microbiology and biotechnology 54 (2000), S. 597-600 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract  A highly chromate-selective biosorbent with high adsorption capacity was found by examining the chromate adsorption capacities of 48 species of red, brown, or green marine algae sampled from the east coast of Korea. As a result of screening, a red marine alga showed excellent adsorption characteristics. It was identified as Pachymeniopsis sp. The timing of the sampling of Pachymeniopsis sp. did not affect the adsorption capacity of the alga but the optimum period for mass collection was April–May. The alga also showed high selectivity for chromate and its adsorption capacity for other heavy metal ions such as cadmium and manganese was relatively low. An investigation of the adsorption isotherm of Pachymeniopsis sp. as a dried powder for chromate adsorption at 25 °C showed Langmuir-type dependence. The maximum chromate adsorption capacity of the selected alga was about 225 mg/g. The desorption of adsorbed chromate from Pachymeniopsis sp. was done by treating samples with 1 N NaOH. It was confirmed that ion exchange type adsorption was observed with anion exchangers but not with cation exchangers. Therefore it is believed that the chromate adsorption is based on the anionic exchange of Pachymeniopsis sp.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530000367
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  • 12
    Electronic Resource
    Electronic Resource
    SAN-Na+-montmorillonite nanocomposite for electrorheological material (1999)
    Springer
    Journal of materials science 18 (1999), S. 1505-1507 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006642317328
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  • 13
    Electronic Resource
    Electronic Resource
    Primary Structure, sequence analysis, and expression of the thermostable d - hydantoinase from Bacillus stearothermophilus SD1 (1997)
    Springer
    Molecular genetics and genomics 255 (1997), S. 152-156 
    Details
    ISSN: 1617-4623
    Keywords: Key words D-Hydantoinase ; Amidohydrolase ; Bacillus stearothermophilus SD1
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The gene coding for the thermostable d-hydantoinase from the thermophilic bacterium Bacillus stearothermophilus SD1 was cloned and its nucleotide sequence was completely determined. The d-hydantoinase protein showed considerable amino acid sequence homology (20–28%) with other hydantoinases and functionally related allantoinases and dihydroorotases. Strikingly the sequence of the enzyme from B. stearothermophilus SD1 exhibited greater than 89% identity with hydantoinases from thermophilic bacteria. Despite the extremely high amino acid homology among the hydantoinases from thermophiles, the C-terminal regions of the enzymes were completely different in both sequence and predicted secondary structure, implying that the C-terminal region plays an important role in determining the biochemical properties of the enzymes. Alignment of the sequence of the d-hydantoinase from B. stearothermophilus SD1 with those of other functionally related enzymes revealed four conserved regions, and five histidines and an acidic residue were found to be conserved, suggesting a close evolutionary relationship between all these enzymes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00008610
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  • 14
    Electronic Resource
    Electronic Resource
    A single, particle-size model for sulfur retention in fluidized bed coal combustors (1981)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 27 (1981), S. 472-481 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A reactor model is presented to calculate the sulfur retention and SO2 emission of a fluidized-bed coal combustor with absorption of SO2 by limestone or dolomite. It is based on the two-phase theory of fluidization and a two parameter simplified rate expression for the sulfation reaction. Both parameters can be determined by experimental reaction rate measurements. In the overall reactor model, an average size is assumed for all the stone particles in the bed. Sulfur retention is found to be dependent on only three dimensionless parameters. Comparisons with experimental measurements indicated that the model predicts satisfactorily the dependence of sulfur retention on the Ca/S ratio, sulfur content of the coal, excess air, gas residence time, and sorbent type.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690270317
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