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  • 1995-1999  (2)
  • Affinity chromatography  (1)
  • Gram-Schmidt downdating algorithm  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Accurate downdating of a modified Gram-Schmidt QR decomposition (1996)
    Springer
    BIT 36 (1996), S. 166-181 
    Details
    ISSN: 1572-9125
    Keywords: QR decomposition downdating ; Gram-Schmidt downdating algorithm ; Householder transformation ; least squares problems ; modified Gram-Schmidt algorithm ; reorthogonalization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract A new algorithm for downdating a QR decomposition is presented. We show that, when the columns in the Q factor from the Modified Gram-Schmidt QR decomposition of a matrixX are exactly orthonormal, the Gram-Schmidt downdating algorithm for the QR decomposition ofX is equivalent to downdating the full Householder QR decomposition of the matrixX augmented by ann ×n zero matrix on top. Using this relation, we derive an algorithm that improves the Gram-Schmidt downdating algorithm when the columns in the Q factor are not orthonormal. Numerical test results show that the new algorithm produces far more accurate results than the Gram-Schmidt downdating algorithm for certain ill-conditioned problems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01740553
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    NADH oxidase ofThermus thermophilus HB8 overproduced fromEscherichia coli (1995)
    Springer
    Protoplasma 184 (1995), S. 104-110 
    Details
    ISSN: 1615-6102
    Keywords: NADH oxidase ; Thermostable flavoprotein ; Affinity chromatography ; Codon usage
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary An NADH oxidase purified from the extreme thermophileThermus thermophilus HB8 is a monomeric flavoprotein with a 1 ∶ 1 ratio of flavin-adenine dinucleotide (FAD) to the polypeptide chain. It catalyzes in vitro the oxidation of reduced NADH or NADPH with the formation of H2O2. The gene encoding the NADH oxidase fromT. thermophilus HB8 was cloned, and its nucleotide sequence was determined. The molecular mass of 22,749 Da, as deduced from thenox gene, agrees with that of the purified NADH oxidase fromT. thermophilus HB8, as estimated by mass spectrometry. Thenox gene does not contain a GX4GK consensus sequence typical for nucleotide binding proteins. Thenox gene was overexpressed inEscherichia coli, and a protocol for the rapid purification of theE. coli-borneT. thermophilus NADH oxidase or its His6-tagged analogue was developed by using thermal denaturation step and affinity chromatography.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01276906
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    Paper (German National Licenses)
    Fulltext
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