Penta Negative
Mostrando 1-7 de 7 artigos, teses e dissertações.
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1. Expressão de marcadores de células-tronco tumorais em carcinomas mamários basais e pentanegativos : estudo em uma série de tumores triplonegativos
INTRODUÇÃO: o câncer de mama é uma doença heterogênea. Há necessidade de critérios diagnósticos e prognósticos mais refinados. O emprego da imunohistoquímica, através do painel prognóstico, fez despontar a figura do carcinoma triplonegativo e, da mesma forma, a histogenética trouxe à evidência o carcinoma basal. Paralelamente, o conhecimento
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2012
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2. Biodegradação do herbicida mesotrione por linhagens bacterianas isoladas de folhas de milho
Chemical fertilizers and pesticides have become an important part of modern agriculture. The use of these chemical brought great benefits but also created new problems, such as disposal after use, persistence over time and accumulation in the environment, resulting significant bad consequences to public health and adverse impact on ecosystems. Maize culture
Publicado em: 2009
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3. Caracterização estrutural e funcional de hemoglobinas de skua, Catharacta maccormicki.
Hemoglobin samples of Catharacta maccormiki (Skua), an Antarctic bird, collected in winter and in summer were studied. Starch gel eletrophoretic pattern hemoglobin oxygen affinities on blood and stripped hemoglobin; influence of organic phosphates that may change affinity and level of those intra-erythrocytic phosphates were analyzed. No differences were fou
Publicado em: 2002
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4. Modification of Lipid A Biosynthesis in Neisseria meningitidis lpxL Mutants: Influence on Lipopolysaccharide Structure, Toxicity, and Adjuvant Activity
Two genes homologous to lpxL and lpxM from Escherichia coli and other gram-negative bacteria, which are involved in lipid A acyloxyacylation, were identified in Neisseria meningitidis strain H44/76 and insertionally inactivated. Analysis by tandem mass spectrometry showed that one of the resulting mutants, termed lpxL1, makes lipopolysaccharide (LPS) with pe
American Society for Microbiology.
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5. Sequence determination of protected oligodeoxyribonucleotides containing phosphotriester linkages by californium-252 plasma desorption mass spectrometry.
A mass spectrometric method for determining the sequence and molecular weight of protected oligodeoxyribonucleotides is described. By using the method of 252Cf plasma desorption mass spectrometry [Macfarlane, R. D. & Torgerson, D. F. (1976) Science 191, 920--925], positive-ion mass spectra were obtained for a series of protected oligonucleotides extending to
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6. Equine arteritis virus subgenomic mRNA synthesis: analysis of leader-body junctions and replicative-form RNAs.
In addition to the genomic RNA, a 3' coterminal nested set of six subgenomic mRNAs is produced in equine arteritis virus (EAV)-infected cells. The seven viral RNAs are also 5' coterminal, since they all contain a 206-nucleotide common leader sequence which is identical to the 5' end of the genome. A conserved penta-nucleotide sequence motif, 5' UCAAC 3', was
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7. Outer Membrane Permeability Barrier in Escherichia coli Mutants That Are Defective in the Late Acyltransferases of Lipid A Biosynthesis
The tight packing of six fatty acids in the lipid A constituent of lipopolysaccharide (LPS) has been proposed to contribute to the unusually low permeability of the outer membrane of gram-negative enteric bacteria to hydrophobic antibiotics. Here it is shown that the Escherichia coli msbB mutant, which elaborates defective, penta-acylated lipid A, is practic
American Society for Microbiology.