n acetyl d glucosamine/تسوس سني

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The central cavity from the (alpha/alpha)6 barrel structure of Anabaena sp. CH1 N-acetyl-D-glucosamine 2-epimerase contains two key histidine residues for reversible conversion.

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N-acetyl-D-glucosamine 2-epimerase (GlcNAc 2-epimerase) catalyzes the reversible epimerization between N-acetyl-D-glucosamine (GlcNAc) and N-acetyl-D-mannosamine (ManNAc). We report here the 2.0 A resolution crystal structure of the GlcNAc 2-epimerase from Anabaena sp. CH1. The structure

Lectin binding to normal mucosa, leukoplakia and squamous cell carcinoma of the oral cavity.

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A panel of fifteen biotinylated lectins was used to study the saccharides associated with the epithelial component of normal and leukoplakic mucosa and squamous cell carcinoma, from a variety of locations in the oral cavity. Lectin binding heterogeneity was found between various sites of normal

Antistreptococcal group A antibodies: production after in vitro activation and hybridization of mouse spleen cells.

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Streptococcal group A polysaccharide-specific antibodies were raised by the method of somatic cell hybridization. Spleen cells of experimentally unprimed BALB/c and C57BL/6 mice were activated in vitro by the streptococcal vaccine and fused with the Sp2/0-Ag14 line at times o, 35, 70, and 105 h

Lectin-conjugated PEG-PLA nanoparticles: preparation and brain delivery after intranasal administration.

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In order to improve the absorption of nanoparticles in the brain following nasal administration, a novel protocol to conjugate biorecognitive ligands-lectins to the surface of poly (ethylene glycol)-poly (lactic acid) (PEG-PLA) nanoparticles was established in the study. Wheat germ agglutinin (WGA),

Biodegradable Chitosan Decreases the Immune Response to Trichinella spiralis in Mice.

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The purpose of this study was to evaluate the potential of chitosan units released during natural degradation of the polymer to activate the immune system against T. spiralis infection. High molecular weight chitosan was injected intraperitoneally into C57BL/6 mice. Flow cytometry and cytokine

Analysis of the secretions of the subcommissural organs of several vertebrate species by use of fluorescent lectins.

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The glycoprotein secretions of the subcommissural organ were analyzed with the use of nine fluorescent lectins, specific to different sugar moieties. After exposure to Concanavalin A a bright fluorescence was observed in the ependymal cells of the subcommissural organs of all vertebrates studied

Effects of the deglycosylation on the structure and activity of chloroperoxidase: Molecular dynamics simulation approach.

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Chloroperoxidase (CPO) is a versatile fungal heme-thiolate protein that catalyzes a variety of one electron and two-electron oxidations. Chloroperoxidase is a versatile fungal heme-thiolate protein that catalyzes a variety of oxidations. CPO enzyme contains thirteen sugars, including five N-acetyl

Determination of the glycosylation-pattern of the middle ear mucosa in guinea pigs.

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In the present study the glycosylation pattern of the middle ear mucosa (MEM) of guinea pigs, an approved model for middle ear research, was characterized with the purpose to identify bioadhesive ligands which might prolong the contact time of drug delivery systems with the middle ear mucosa (MEM).

[Lectin histochemical study on human dental pulp. Special reference to odontoblasts and pulp cells].

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The present study investigated some lectin affinities of human dental pulps, especially of odontoblasts and pulp cells. The materials were obtained from clinically intact teeth that were caries-free, attrition and/or abrasion-free. Mucopolysaccharide staining was carried out with applied PAS and

Hyaluronan synthesis and degradation in cartilage and bone.

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Hyaluronan (HA) is a large but simple glycosaminoglycan composed of repeating D-glucuronic acid, beta1-3 linked to N-acetyl-D-glucosamine beta1-4, found in body fluids and tissues, in both intra- and extracellular compartments. Despite its structural simplicity, HA has diverse functions in skeletal

[Development of slow releasing anticancer drug based with absorbable biomaterial chitin].

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To have a comparatively more slowly releasing anticancer drug with effectiveness, Plachitin was prepared by chemical combination of CDDP and chitin (poly-N-acetyl-D-glucosamine). Chitin is absorbed by the living body over several months. To investigate the slow releasing property, it was implanted

Characterization of IL-2-dependent cytotoxic T-cell clones. III. Inhibition of killing activity by monosaccharides.

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The effects of monosaccharides on the cytotoxic activity of cytotoxic T lymphocytes (CTL) and three cloned long-term cytotoxic T-lymphocyte lines (CTLL) are compared. Uncultured CTL and clones CTLL-A2 and CTLL-A11 were derived from the peritoneal cavity of C57BL/6 mice immunized against the H-2Dd

NagR Differentially Regulates the Expression of the glmS and nagAB Genes Required for Amino Sugar Metabolism by Streptococcus mutans.

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The ability of bacteria to metabolize glucosamine (GlcN) and N-acetyl-d-glucosamine (GlcNAc) is considered important for persistent colonization of the oral cavity. In the dental caries pathogen Streptococcus mutans, the NagR protein regulates the expression of glmS, which encodes a GlcN-6-P

PgaB orthologues contain a glycoside hydrolase domain that cleaves deacetylated poly-β(1,6)-N-acetylglucosamine and can disrupt bacterial biofilms.

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Poly-β(1,6)-N-acetyl-D-glucosamine (PNAG) is a major biofilm component of many pathogenic bacteria. The production, modification, and export of PNAG in Escherichia coli and Bordetella species require the protein products encoded by the pgaABCD operon. PgaB is a two-domain periplasmic protein that

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