A. J. Perez Tchernov

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A rapid, inexpensive and reliable procedure for separation and purification of C-phycocyanin (C-PC) and allophycocyanin (APC) from Arthronema africanum based on a previously described rivanol-sulfate method for C-PC purification was developed. Exclusion of NaCl from the extraction buffer resulted in complete separation of APC and C-PC, two-fold reduction of(More)
Two recombinant lambda DNAs, lambda gt::pMB9 and lambda NM::pBR322, containing, respectively, the pMB9 and pBR322 replicon were constructed and characterized. Both constructs (phagemid DNAs) transfect Escherichia coli cells, producing mature infectious phage progenies. Alternatively, drug-resistant colonies of transductants can be selected upon infection(More)
We report the characterization and cloning of the genes for an unusual type IV restriction-modification system, BspLU11III, from Bacillus sp. LU11. The system consists of two methyltransferases and one endonuclease, which also possesses methyltransferase activity. The three genes of the restriction-modification system, bsplu11IIIMa, bsplu11IIIMb and(More)
The DNA of bacteriophage T5 has been treated with restriction endonucleases EcoRI, HindIII, BamI, SmaI, PstI, SalI, KpnI and the electrophoretic pattern obtained in agarose gel has been analyzed in order to localize the specific cleavage sites on the T5 DNA. The localization of cleavage sites has been reduced from the electrophoretic pattern of double and(More)
Given an undirected connected network G = (V, E), n = |V |, m = |E|, and a weight function w : E → R + , finding a basis of the cut space with minimum sum of the cut weights is termed Minimum Cut Basis Problem. This problem can be solved, e.g., by the algorithm of Gomory and Hu [GH61]. If, however, fundamentality is required, i.e., the basis is induced by a(More)
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