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Mostrando 13-19 de 19 artigos, teses e dissertações.
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13. Ciência da informação em perspectiva histórica: Lydia de Queiroz Sambaquy e o aporte da Documentação (Brasil, 1930-1970) / Information Science in historical perspective: Lydia de Queiroz Sambaquy and the contribution of Documentation (Brazil, 1930- 1970)
Since its first disciplinary documents Information Science stressed its distinction from Librarianship. During the last forty years however what can be seen is a straight closeness between them. This research looks through the history of Librarianship in Brazil during the period from 1930 to 1970. It stresses the role of Lydia de Queiroz Sambaquy at the Libr
Publicado em: 2004
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14. Isolation and identification of eight microcystins from thirteen Oscillatoria agardhii strains and structure of a new microcystin.
Microcystins (cyclic heptapeptide hepatotoxins), isolated from 13 freshwater Oscillatoria agardhii strains from eight different Finnish lakes by high-performance liquid chromatography, were characterized by amino acid analysis, fast atom bombardment mass spectrometry (FABMS), and tandem FABMS (FABMS/collisionary-induced dissociation/MS). All strains produced
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15. Isolation and characterization of a variety of microcystins from seven strains of the cyanobacterial genus Anabaena.
Hepatotoxins (microcystins) from seven freshwater Anabaena strains originating from three different Finnish lakes and one lake in Norway were isolated by high-performance liquid chromatography and characterized by amino acid analysis and fast atom bombardment mass spectrometry. All strains produced three to seven different microcystins. A total of 17 differe
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16. Colorimetric Immuno-Protein Phosphatase Inhibition Assay for Specific Detection of Microcystins and Nodularins of Cyanobacteria
A novel immunoassay was developed for specific detection of cyanobacterial cyclic peptide hepatotoxins which inhibit protein phosphatases. Immunoassay methods currently used for microcystin and nodularin detection and analysis do not provide information on the toxicity of microcystin and/or nodularin variants. Furthermore, protein phosphatase inhibition-base
American Society for Microbiology.
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17. Discovery of Rare and Highly Toxic Microcystins from Lichen-Associated Cyanobacterium Nostoc sp. Strain IO-102-I
The production of hepatotoxic cyclic heptapeptides, microcystins, is almost exclusively reported from planktonic cyanobacteria. Here we show that a terrestrial cyanobacterium Nostoc sp. strain IO-102-I isolated from a lichen association produces six different microcystins. Microcystins were identified with liquid chromatography-UV mass spectrometry by their
American Society for Microbiology.
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18. A Second Protein l-Isoaspartyl Methyltransferase Gene in Arabidopsis Produces Two Transcripts Whose Products Are Sequestered in the Nucleus1[w]
The spontaneous and deleterious conversion of l-asparaginyl and l-aspartyl protein residues to l-iso-Asp or d-Asp occurs as proteins age and is accelerated under stressful conditions. Arabidopsis (Arabidopsis L. Heynh.) contains two genes (At3g48330 and At5g50240) encoding protein-l-isoaspartate methyltransferase (EC 2.1.1.77; PIMT), an enzyme capable of cor
American Society of Plant Biologists.
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19. Conversion of isoaspartyl peptides to normal peptides: implications for the cellular repair of damaged proteins.
The hypothesis that cellular protein carboxyl-methylation reactions recognize altered aspartyl residues as part of a protein repair pathway has been tested in an in vitro system using tetragastrin (Trp-Met-Asp-Phe-NH2) as a model sequence. The L-isoaspartyl form of tetragastrin, where the phenylalanine residue is linked to the side-chain carboxyl group of th