Chitooligomers
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. The use of lysozyme to prepare biologically active chitooligomers
Two types of crustacean commercial chitosans (CS1, CS2) were dissolved in lactic acid solutions, hydrolysed by lysozyme and finally fractioned by methanol solutions into two parts containing chito-oligomers (CS-O1, CS-O2). The antioxidant power and antimicrobial properties of both fractions were studied and compared with non-hydrolysed CS1 and CS2. The antio
Polímeros. Publicado em: 2015-02
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2. Characterization of the effects chitosan on the inhition of phytopathogenic fungi / Caracterização dos efeitos de quitosanas na inibição de fungos fitopatogenicos
Na primeira etapa deste trabalho foi feita uma revisão de literatura referente à atividade antifúngica de quitina, quitosana e seus derivados contra diferentes tipos de microrganismos, como bactérias, fungos e leveduras. Nesta revisão são descritos importantes desenvolvimentos relativos a aplicação de quitosana e seus derivados como substância antim
Publicado em: 2006
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3. Interaction of Ammonium, Glucose, and Chitin Regulates the Expression of Cell Wall-Degrading Enzymes in Trichoderma atroviride Strain P1
Chitinolytic and glucanolytic fungal cell wall-degrading enzymes have been suggested to be primary determinants of biocontrol by Trichoderma spp. We examined the effects of ammonium, glucose, chitin, and chito-oligomers on transcription of specific genes and secretion of fungal cell wall-degrading enzymes. The genes ech42, nag1, and gluc78 were examined, as
American Society for Microbiology.
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4. Growth of Hyperthermophilic Archaeon Pyrococcus furiosus on Chitin Involves Two Family 18 Chitinases
Pyrococcus furiosus was found to grow on chitin, adding this polysacharide to the inventory of carbohydrates utilized by this hyperthermophilic archaeon. Accordingly, two open reading frames (chiA [Pf1234] and chiB [Pf1233]) were identified in the genome of P. furiosus, which encodes chitinases with sequence similarity to proteins from the glycosyl hydrolase
American Society for Microbiology.
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5. Endothelial cell GlcNAc beta 1-4GlcNAc epitopes for outer membrane protein A enhance traversal of Escherichia coli across the blood-brain barrier.
Inadequate knowledge of pathogenesis and pathophysiology has contributed to the high mortality and morbidity associated with neonatal Escherichia coli meningitis. We have shown previously that outer membrane protein A (OmpA) contributes to E. coli K1 membrane invasion of brain microvascular endothelial cells. In this study we report that this OmpA+ K1 E. col
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6. Loss-of-Function Mutations in Chitin Responsive Genes Show Increased Susceptibility to the Powdery Mildew Pathogen Erysiphe cichoracearum1[w]
Chitin is a major component of fungal walls and insect exoskeletons. Plants produce chitinases upon pathogen attack and chito-oligomers induce defense responses in plants, though the exact mechanism behind this response is unknown. Using the ATH1 Affymetrix microarrays consisting of about 23,000 genes, we examined the response of Arabidopsis (Arabidopsis tha
American Society of Plant Biologists.
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7. Nod Factors and Chitooligomers Elicit an Increase in Cytosolic Calcium in Aequorin-Expressing Soybean Cells1
Rhizobial Nod factors (NFs) function as nodulation signals that trigger symbiotic responses of leguminous host plants. NFs consist of a chitin oligomer backbone carrying a fatty acid at the non-reducing end. Depending on the rhizobial strain, NFs carry additional substituents, which may determine host specificity. Transgenic suspension-cultured soybean (Glyc
American Society of Plant Physiologists.
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8. Expression of Two Major Chitinase Genes of Trichoderma atroviride (T. harzianum P1) Is Triggered by Different Regulatory Signals
Regulation of the expression of the two major chitinase genes, ech42 (encoding the CHIT42 endochitinase) and nag1 (encoding the CHIT73 N-acetyl-β-d-glucosaminidase), of the chitinolytic system of the mycoparasitic biocontrol fungus Trichoderma atroviride (= Trichoderma harzianum P1) was investigated by using a reporter system based on the Aspergillus niger
American Society for Microbiology.
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9. Outer Membrane Protein A-Promoted Actin Condensation of Brain Microvascular Endothelial Cells Is Required for Escherichia coli Invasion
Escherichia coli is the most common gram-negative bacterium that causes meningitis during the neonatal period. We have previously shown that the entry of circulating E. coli organisms into the central nervous system is due to their ability to invade the blood-brain barrier, which is composed of a layer of brain microvascular endothelial cells (BMEC). In this
American Society for Microbiology.