Search Results
Results 201 - 250 of 1907
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Xia Siqing - - 2008
A bioflocculant TJ-F1 with high flocculating activity, produced by strain TJ-1 from a mixed activated sludge, was investigated with regard to its production and characterization. By 16S rDNA sequence and biochemical and physiological characteristics, strain TJ-1 was identified as Proteus mirabilis. The most preferred carbon source, nitrogen source and C/N ...
Arar Sharif - - 2008
Alloiococcus otitidis is a recently discovered Gram-positive bacterium that has been linked with otitis media (middle ear infections). In this study, we describe the structure of a novel capsular polysaccharide (PS) expressed by the type-strain of A. otitidis, ATCC 51267, and the synthesis of a glycoconjugate composed of the capsule ...
Kumar Rishi - - 2008
Concise chemical synthesis of a tetrasaccharide repeating unit of the O-antigen of Hafnia alvei 10457 is reported. Construction of the tetrasaccharide as its 4-methoxyphenyl glycoside was achieved by condensation of less abundant monosaccharide units such as, D-galactofuranose, N-acetyl-D-galactosamine and N-acetylneuraminic acid. The synthetic strategy consists of the preparation of suitably ...
Vesely Jan - - 2008
An alternative pathway to glucuronic acid-containing di- and trisaccharide thioglycoside building blocks, suitable for the synthesis of Cryptococcus neoformans capsular polysaccharide structures, has been developed. As opposed to our earlier synthesis, this approach features the introduction of the glucuronic acid motif at the di- and trisaccharide level through oxidation of ...
Wang Zhan - - 2008
The O-chain polysaccharide produced by a mild acid degradation of Aeromonas caviae ATCC 15468 lipopolysaccharide was found to be composed of L-rhamnose, 2-acetamido-2-deoxy-D-glucose, 2-acetamido-2-deoxy-D-galactose and phosphoglycerol. Subsequent methylation and CE-ESIMS analyses and 1D/2D NMR ((1)H, (13)C and (31)P) spectroscopy showed that the O-chain polysaccharide is a high-molecular-mass acidic branched polymer ...
Mazumder Koushik - - 2008
A novel sugar, 5,7-diacetamido-8-amino-3,5,7,8,9-pentadeoxy-D-glycero-D-galacto-non-2-ulosonic acid (NonlA), has been identified as a component of the oligosaccharide (OS) isolated from the lipooligosaccharide (LOS) of the emerging strain of Vibrio parahaemolyticus O3:K6 associated with a global pandemic. In the present study we report the identification and characterization of this novel sugar present in ...
Plaza C - - 2008
The chemical changes occurring in a cattle manure (CM) and a mixture of two-phase olive pomace and CM (OP+CM) after vermicomposting with Eisenia andrei for eight months were evaluated. Further, humic acid (HA)-like fractions were isolated from the two substrates before and after the vermicomposting process, and analyzed for elemental ...
Benoit Isabelle - - 2008
Feruloyl esterases are part of the enzymatic spectrum employed by fungi and other microorganisms to degrade plant polysaccharides. They release ferulic acid and other aromatic acids from these polymeric structures and have received an increasing interest in industrial applications such as in the food, pulp and paper and bio-fuel industries. ...
Leplé Jean-Charles - - 2007
Cinnamoyl-CoA reductase (CCR) catalyzes the penultimate step in monolignol biosynthesis. We show that downregulation of CCR in transgenic poplar (Populus tremula x Populus alba) was associated with up to 50% reduced lignin content and an orange-brown, often patchy, coloration of the outer xylem. Thioacidolysis, nuclear magnetic resonance (NMR), immunocytochemistry of ...
Perepelov Andrei V - - 2008
An acidic O-polysaccharide was isolated by mild acid degradation of the lipopolysaccharide of Escherichia coli O112ab and studied by sugar analysis along with (1)H and (13)C NMR spectroscopy. The O-polysaccharide was found to contain a rarely occurring sugar component, L-iduronic acid (L-IdoA), and the following structure of the branched pentasaccharide ...
Ghosh Kaushik - - 2008
A water-soluble polysaccharide was isolated from the aqueous extract of the stem of Lagenaria siceraria. The polysaccharide was found to be constituted of methyl d-galacturonate, 2-O-methyl-D-xylose, and d-xylose in a ratio of 1:1:1. On the basis of total acid hydrolysis, methylation analysis, periodate oxidation, NMR studies ((1)H, (13)C, 2D-COSY, TOCSY, ...
Happi Emaga Thomas - - 2008
The effects of the ripeness stage of banana (Musa AAA) and plantain (Musa AAB) peels on neutral detergent fibre, acid detergent fibre, cellulose, hemicelluloses, lignin, pectin contents, and pectin chemical features were studied. Plantain peels contained a higher amount of lignin but had a lower hemicellulose content than banana peels. ...
Yang Xingbin - - 2007
An analytical method of high performance capillary electrophoresis (HPCE) was developed to simultaneously separate and identify the component monosaccharides of Angelica sinensis polysaccharide fractions (APFs), named APF1, APF2 and APF3. The predominant sugars in APFs were identified as arabinose, glucose, rhamnose, galactose and galacturonic acid as well as trace amount ...
Volpi Nicola - - 2008
Chondroitin C lyase was demonstrated to be unable to act on fructosylated sequences inside a partially fructosylated polysaccharide having the chondroitin backbone structure, the Escherichia coli K4 polymer, using different analytical approaches. Chondroitin C lyase produced various unsaturated oligosaccharides by acting on an approximately 27%-fructosylated K4 polymer. The online HPLC-ESI-MS ...
Xie Gang - - 2007
Tanacetum vulgare L. (Tansy) has been extensively used in folk medicine for treatment of a variety of medical disorders. In the present study, we isolated and purified four acidic polysaccharide fractions (designated T-I to T-IV) from Tansy florets by the sequential use of hot-water extraction, ethanol precipitation, ultra-filtration, anion-exchange, and ...
Liavoga Allan B - - 2007
Xylitol is a valuable sweetener produced from xylose-rich biomass. Our objective was to optimize conditions for maximum release of D-xylose from wheat straw by acid or enzyme hydrolysis with minimal release of other monosaccharides, and to purify xylitol from three other alditols. Ground straw was treated with 10 parts of ...
Roy Sadhan K - - 2007
A water-soluble polysaccharide was isolated from the aqueous extract of pods of Moringa oleifera. The polysaccharide contains d-galactose, 6-O-Me-D-galactose, D-galacturonic acid, l-arabinose, and l-rhamnose in a molar ratio of 1:1:1:1:1. On the basis of total hydrolysis, methylation analysis, periodate oxidation, and NMR ((1)H, (13)C, TOCSY, DQF-COSY, NOESY, ROESY, HSQC, and ...
Patle Sonali - - 2007
Acid, alkaline and enzymatic hydrolysis of agricultural crop wastes were compared for yields of total reducing sugars with the hydrolysates being evaluated for ethanol production using a mixed culture of Zymomonas mobilis and Candida tropicalis. Acid hydrolysis of fruit and vegetable residues gave 49-84 g reducing sugars l(-1) and 29-32 ...
Gniechwitz Diana - - 2007
Arabinogalactans and galactomannans from coffee beverages are part of the dietary fiber complex. Chemical structures and fermentability of soluble dietary fiber obtained from a standard filter coffee beverage (Coffea arabica, origin Colombia, medium roasted) by human intestinal bacteria were investigated. One cup (150 mL) of filter coffee contained approximately 0.5 ...
Chandra Krishnendu - - 2007
A water-soluble glucan was isolated from an edible mushroom, Termitomyces microcarpus. On the basis of total acid hydrolysis, methylation analysis, periodate oxidation and NMR studies ((1)H, (13)C, TOCSY, DQF-COSY, NOESY and HSQC), the repeating unit of the polysaccharide is established as -->4)-alpha--Glcp-(1-->3)-beta--Glcp-(1-->
Sánchez-Medina Inmaculada - - 2007
The neutral exopolysaccharide produced by Lactobacillus delbrueckii ssp. bulgaricus LBB.B26 in skimmed milk was found to be composed of d-glucose and d-galactose in a molar ratio of 2:3. Linkage analysis and 1D/2D NMR ((1)H and (13)C) studies performed on the native polysaccharide, and on an oligosaccharide obtained from a partial ...
Uenishi Yuko - - 2007
Mycobacterial cell walls have diverse adjuvant activities, and in particular, cell wall skeleton (CWS) of Mycobacterium bovis BCG has been expected as a drug for tumor immunotherapy. However, its molecular structure-biological activity relationship has not been fully elucidated despite more than 30 years of intensive research. Since it is important ...
Banerjee P N - - 2007
This article reports the isolation and structural investigation of an acidic polysaccharide of the seeds of Prunus armeniaca (apricot) - a plant of commercial importance. The polysaccharide is composed of three sugars - mannose (50%), glucose (37.5%) and glucuronic acid (12.5%). The results of methylation analysis, partial depolymerisation, Smith degradation ...
Yang Xingbin - - 2007
A simple and sensitive high-performance capillary electrophoresis (HPCE) method was designed for quantitative analysis of the component monosaccharides of an acidic polysaccharide extracted from pumpkin. In this method, the polysaccharide was hydrolyzed into component monosaccharides with 2.0 M trifluoroacetic acid at 100 degrees C for 6 h and then labeled ...
Ovchinnikova Olga G - - 2007
The O-polysaccharide was isolated by mild acid degradation of the lipopolysaccharide of Providencia alcalifaciens O6 and studied by sugar and methylation analysis, selective hydrolytic removal of 3,6-dideoxy-L-xylo-hexose (colitose, Col), (1)H and (13)C NMR spectroscopy, including 2D (1)H,(1)H COSY, TOCSY, ROESY and H-detected (1)H,(13)C HSQC and HMBC experiments. The polysaccharide was ...
Ozaki Noriaki - - 2007
Coccolith, a calcified scale with species-specific fine structure produced by marine unicellular coccolithophorid algae, consists of calcium carbonate (CaCO(3)) crystals and a small amount of organic matrices. A novel polysaccharide named coccolith matrix acidic polysaccharide (CMAP) was isolated from the coccolith of a coccolithophorid alga, Pleurochrysis haptonemofera. The structure of ...
Romero Patricia - - 2007
LytA, the main autolysin of Streptococcus pneumoniae, was the first member of the bacterial N-acetylmuramoyl-l-alanine amidase (NAM-amidase) family of proteins to be well characterized. This autolysin degrades the peptidoglycan bonds of pneumococcal cell walls after anchoring to the choline residues of the cell wall teichoic acids via its choline-binding module ...
Perepelov Andrei V - - 2007
The O-polysaccharide was isolated from the lipopolysaccharide of Cellulophaga fucicola and studied by chemical analyses along with (1)H and (13)C NMR spectroscopy. The following new structure of the O-polysaccharide of C. fucicola containing 5,7-diacetamido-3,5,7,9-tetradeoxy-L-glycero-L-manno-non-2-ulosonic acid residue (pseudoaminic acid, Psep) was elucidated as the following:
Singh R B - - 2007
Agathis australis gum on acid hydrolysis with sulphuric acid yielded L-arabinose and D-galactose in 1:4 molar ratio with traces of L-fucose. The components of aldobiouronic acid and glucuronic acid were obtained by graded hydrolysis of degraded gum polysaccharide. The derivatives of aldobiouronic acid was obtained as methyl ester methyl glycoside.
Li Junxin - - 2007
A rapid, mild and readily scaleable method for purification and isolation of single-walled nanotubes (SWNTs) using aqueous nitric acid that, in only 1-2 hours at reflux temperature, not only decrease the content of residual metal particles but also the relative ratio of small diameter and metallic NTs. The acid-treated SWNTs ...
Vrsanská Mária - - 2007
The mode of action of xylanase A from a phytopathogenic bacterium, Erwinia chrysanthemi, classified in glycoside hydrolase family 5, was investigated on xylooligosaccharides and polysaccharides using TLC, MALDI-TOF MS and enzyme treatment with exoglycosidases. The hydrolytic action of xylanase A was found to be absolutely dependent on the presence of ...
Dong Qun - - 2007
Two major polysaccharide fractions, CDA-1A and CDA-3B, were isolated from the cold-water extract of Cistanche deserticola Y. C. Ma, a holoparasitic plant and a valuable traditional Chinese medicine, using anion-exchange chromatography on DEAE-cellulose and gel-permeation chromatography on Sephacryl S-300 and Sephadex G-150. Their major structural features were elucidated using component ...
Findlow Jamie - - 2007
The surrogate of protection against Neisseria meningitidis serogroup B (MenB) is the serum bactericidal antibody (SBA) assay, which measures the functional activity of antibody by using an exogenous complement source. Despite baby rabbit complement having been used in meningococcal serogroup A, C, Y, and W135 SBA assays, it is not ...
Chen Haixia - - 2007
Tea polysaccharide conjugate is one of the main bioactive constituents of tea (Camellia sinensis L.). The chemical composition and preliminary toxicological evaluation of a tea polysaccharide conjugate was investigated to determine the possibility of using it for human consumption. Chemical analysis of tea polysaccharide conjugate showed that the tea polysaccharide ...
Chakraborty Indranil - - 2007
A polysaccharide fraction (AQS-II) has been isolated from the hot aqueous extract of the fruits of an ectomycorrhizal fungus Astraeus hygrometricus. It was found to contain 63% polysaccharide and 35% protein. The polysaccharide part contains glucose, galactose, and fucose in a 2:1:1 molar ratio. On the basis of total acid ...
Urai Makoto - - 2007
Rhodococcus erythropolis PR4 is a marine bacterium that can degrade various alkanes including pristane, a C(19) branched alkane. This strain produces a large quantity of extracellular polysaccharides, which are assumed to play an important role in the hydrocarbon tolerance of this bacterium. The strain produced two acidic extracellular polysaccharides, FR1 ...
Urai Makoto - - 2007
Rhodococcus erythropolis PR4 is a marine bacterium that can degrade various alkanes including pristane, a C(19) branched alkane. This strain produces a large quantity of extracellular polysaccharides (EPS), which are assumed to play an important role in the hydrocarbon tolerance of R. erythropolis PR4. The strain produced an acidic EPS, ...
Meppen Malte - - 2007
With the hope of mimicking the chemical and biological properties of natural 6-O-methyl-D-glucose-containing polysaccharides (MGPs), synthetic 6-O-methyl-D-glucose-containing polysaccharides (sMGPs) were designed and synthesized from alpha-, beta-, and gamma-cyclodextrins (CDs). The synthetic route proved to be flexible and general, to furnish a series of sMGPs ranging from 6-mer to 20-mer. A ...
Ortega-Morales B O - - 2007
AIM: This study was performed to determine the potential of tropical intertidal biofilm bacteria as a source of novel exopolymers (EPS). METHODS AND RESULTS: A screening procedure was implemented to detect EPS-producing biofilm bacteria. Isolates MC3B-10 and MC6B-22, identified respectively as a Microbacterium species and Bacillus species by 16S rDNA ...
Kaito Chikara - - 2007
Wild-type Staphylococcus aureus rapidly expands on the surface of soft agar plates. The rates of expansion and the shapes of the resultant giant colonies were distinct for different strains of laboratory stocks and clinical isolates. The colony spreading abilities did not correlate with the biofilm-forming abilities in these strains. Insertional ...
Bushmarinov Ivan S - - 2007
The O-polysaccharide was obtained by mild acid degradation of the lipopolysaccharide of Providencia alcalifaciens O32 and studied by sugar and methylation analyses, solvolysis with triflic acid, 1H and 13C NMR spectroscopy, including two-dimensional 1H,1H COSY, TOCSY, ROESY, H-detected 1H,13C HSQC and HMBC experiments. It was found that the polysaccharide has ...
Jin Chang-Hai - - 2006
Changes in cell wall structure, decrease in tissue firmness and ethylene production in honey peach [Prunus persica (L.) Batsch, cv. 'Yuhuasanhao'] were investigated after various storage at 5 degrees C and at 20 degrees C. The results showed that during storage, the peak of ethylene production lagged significantly behind the ...
Chakraborty Indranil - - 2006
A water-insoluble glucan, TEINS has been isolated from the hot alkaline extract of an edible mushroom Termitomyces eurhizus. The total carbohydrate content of the polysaccharide fraction was found to be 98.4%, and it was found to contain only glucose as the monosaccharide constituent. On the basis of total acid hydrolysis, ...
Raungsomboon Suneerat - - 2006
Pb2+ adsorption by the living cells of the cyanobacterium Gloeocapsa gelatinosa was studied. Cyanobacterial cells with intact capsular polysaccharide (CPS) showed 5.7 times higher Pb adsorption capacity than that of cells without CPS. The adsorbed Pb was desorbed by EDTA, indicating that Pb2+ adsorption occurred mainly on cell surface. Production, ...
Weimer Paul J - - 2006
Anaerobic cellulolytic bacteria are thought to adhere to cellulose via several mechanisms, including production of a glycocalyx containing extracellular polymeric substances (EPS). As the compositions and structures of these glycocalyces have not been elucidated, variable-pressure scanning electron microscopy (VP-SEM) and chemical analysis were used to characterize the glycocalyx of the ...
Kilcoyne Michelle - - 2006
The nature of the polysaccharide molecules of the human enteric pathogen Campylobacter jejuni has been the subject of debate. Previously, C. jejuni 81116 was shown to contain two different polysaccharides, one acidic (polysaccharide A) and the other neutral (polysaccharide B), occurring in a 3 : 1 ratio, respectively. The aim ...
Fang Xubo - - 2006
An acidic polysaccharide fraction that had high anticomplementary activity was isolated from the stems of Grey Mangrove in 0.15% yield. The final fractions was designated HAM-3-IIb-II. The polysaccharide fraction appeared to be homogenous by high performance size exclusion chromatography with an estimated molecular weight of 105 kDa. The isolated polysaccharide ...
D'Elia Michael A - - 2006
An extensive literature has established that the synthesis of wall teichoic acid in Bacillus subtilis is essential for cell viability. Paradoxically, we have recently shown that wall teichoic acid biogenesis is dispensable in Staphylococcus aureus (M. A. D'Elia, M. P. Pereira, Y. S. Chung, W. Zhao, A. Chau, T. J. ...
Perepelov Andrei V - - 2007
An acidic O-polysaccharide was obtained by mild acid degradation of the lipopolysaccharide of Escherichia coli O150 and studied by sugar and methylation analyses, triflic acid solvolysis, Smith degradation, (1)H and (13)C NMR spectroscopy, including 2D ROESY, (1)H,(13)C HSQC, HMQC-TOCSY, and HMBC experiments. The polysaccharide was found to contain a regioisomer ...
Zhu Ying - - 2006
Panax notoginseng is a commonly used medicinal plant in south-western China. In a previous study, a sequential solubilisation of P. notoginseng high-molecular-weight (HMW) polymers using phenol-acetic acid-water, hot water, weak and strong alkali was performed to determine the structure of the component polysaccharides and proteins. The effects of these extracted ...
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