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  • Akivis algebra  (1)
  • Double-strand gap  (1)
  • Photosystem II  (1)
  • Springer  (3)
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  • Springer  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Geometriae dedicata 77 (1999), S. 215-223 
    ISSN: 1572-9168
    Keywords: Akivis algebra ; local analytic loop ; universal enveloping algebra.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract An Akivis algebra is a vector space V endowed with a skew-symmetric bilinear product [x,y] and a trilinear product A(x,y,z) that satisfy the identity $$\begin{gathered} [[x,y],z] + [[y,z],x] + [[z,x],y] \hfill \\ = {\mathcal{A}}(x,y,z) + {\mathcal{A}}(y,z,x) + {\mathcal{A}}(z,x,y) - {\mathcal{A}}(y,x,z) - {\mathcal{A}}(x,z,y) - {\mathcal{A}}(z,y,x). \hfill \\ \end{gathered}$$ These algebras were introduced in 1976 by M.A. Akivis as local algebras of three-webs. For any (nonassociative) algebra B one may obtain an Akivis algebra Ak (B) by considering in B the usual commutator [x,y] = xy − yx and associator A(x,y,z) = (xy)z − x(yz). Akivis posed the problem whether every Akivis algebra is isomorphic to a subalgebra of Ak (B) for a certain B. We prove that this problem has a positive answer.
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  • 2
    ISSN: 1432-0983
    Keywords: Double-strand gap ; Plasmid DNA repair ; Yeast transformation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The repair of double-strand gaps (DSGs) in the plasmid DNA of radiosensitive mutants of Saccharomyces cerevisiae has been analyzed. The proportion of repair events that resulted in complete plasmid DNA DSG recovery was close to 100% in Rad+ cells. Mutation rad55 does not influence the efficiency and preciseness of DSG repair. The mutant rad57, which is capable of recombinational DNA DSB repair, resulted in no DSG recovery. Mutation rad53 substantially inhibits the efficiency of DSG repair but does not influence the precision of repair. Plasmid DNA DSG repair is completely blocked by mutations rad50 and rad54.
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  • 3
    ISSN: 1573-5079
    Keywords: chlorophyll-binding protein CP47 ; DNA sequence ; gene analysis ; mutagenesis ; Photosystem II
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Ten strains from a collection of mutants ofSynechocystis 6803 defective in Photosystem II (PS II) function were transformed with chromosomal DNA of wild-type and mutant cells. Cross hybridization data allowed to identify four groups of PS II-mutants. Highly efficient transformation was observed between different mutant groups, but not within the groups. Restoration of photosynthetic activity of the mutant cells was also achieved by transformation with different parts of a 5.6 kbBam HI fragment of wild typeSynechocystis DNA containing thepsbB gene. Each group of mutants was transformed to photoautotrophic growth by specific subfragments of thepsbB gene. DNA fragments of four selected mutant strains hybridizing with thepsbB gene were isolated and sequenced. The mutations were identified as a single nucleotide insertion or substitution leading to stop codon formation in two of the mutants, as a deletion of 12 nucleotides, or as a nucleotide substitution resulting in an amino acid substitution in the other two mutants. Deletion of 12 nucleotides in mutant strain PMB1 and stop codon formation in strain NF16 affect membrane-spanning regions of the gene product, the CP 47 protein.
    Type of Medium: Electronic Resource
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