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effects of proteus vulgaris growth on the establishment of a cheese microbial community and on the production of volatile aroma compounds in a model cheese.to investigate the impact of proteus vulgaris growth on a multispecies ecosystem and on volatile aroma compound production during cheese ripening.200919426267
gangrenous cholecystitis caused by hafnia alvei: a case report and review of literature. 200919497550
phenotypic characterization of human pathogenic bacteria in fish from the coastal waters of south west cameroon: public health implications.increasing economic and recreational opportunities, attractive scenery and a perception of a better quality of life are luring people to the coast. unfortunately, these activities together with the commensurate increase in population in the area inevitably result in pollution of coastal waters with excessive microorganisms and other pollutants. microbial pollutants not only contaminate the coastal water but also aquatic food sources, thus posing a health risk to consumers. fish is a major source ...200919658320
gram-negative bacteria associated with brewery yeasts: reclassification of obesumbacterium proteus biogroup 2 as shimwellia pseudoproteus gen. nov., sp. nov., and transfer of escherichia blattae to shimwellia blattae comb. nov.phylogenetic analyses of type and reference strains of obesumbacterium proteus biogroups 1 and 2 plus a novel isolate of biogroup 2 were carried out based on 16s rrna gene sequences and partial sequences of four protein-coding genes (fusa, leus, pyrg and rpob). both approaches revealed that o. proteus biogroup 1 strains were closely related to hafnia alvei. biogroup 2 strains, however, formed a distinct monophyletic clade of generic status that included escherichia blattae. phenotypic tests were ...201019661513
structural analysis of the lipid a isolated from hafnia alvei 32 and pcm 1192 lipopolysaccharides.hafnia alvei, a gram-negative bacterium, is an opportunistic pathogen associated with mixed hospital infections, bacteremia, septicemia, and respiratory diseases. the majority of clinical symptoms of diseases caused by this bacterium have a lipopolysaccharide (lps, endotoxin)-related origin. the lipid a structure affects the biological activity of endotoxins predominantly. thus, the structure of h. alvei lipid a was analyzed for the first time. the major form, asymmetrically hexa-acylated lipid ...201019706748
hafnia paralvei sp. nov., formerly known as hafnia alvei hybridization group 2.it has been shown previously, based largely on dna-dna hybridizations and partial 16s rrna gene sequencing, that hafnia alvei is genotypically heterogeneous and consists of at least two dna hybridization groups (hgs). in the present study, the taxonomic status of h. alvei hgs 1 and 2 was reassessed. a panel of 24 reference strains and isolates previously assigned to one of the two hgs in h. alvei was subjected to (gtg)5-pcr fingerprinting; this resulted in the delineation of two (gtg)5-pcr clust ...201019734282
[hafnia alvei]. 200919802404
technology-induced selection towards the spoilage microbiota of artisan-type cooked ham packed under modified atmosphere.the microbiota associated with a highly-perishable belgian artisan-type cooked ham was analyzed through plating and (gtg)(5)-fingerprinting of isolates throughout its processing chain. the raw tumbled meat was characterized by the presence of a versatile microbiota around 4.8 log(cfu g(-1)), consisting of lactic acid bacteria, staphylococci, brochothrix thermosphacta, gram-negative bacteria, and yeasts. pasteurisation of the ham logs reduced bacterial counts below 2 log(cfu g(-1)) and subsequent ...201019913696
novel o-antigen of hafnia alvei pcm 1195 lipopolysaccharide with a teichoic acid-like structure.the lipopolysaccharide (lps) of hafnia alvei strain pcm 1195 was obtained by the hot phenol/water method. the o-specific polysaccharide was released by mild acidic hydrolysis and isolated by gel filtration. the structure of the o-specific polysaccharide was investigated by (1)h, (13)c, and (31)p nmr spectroscopy, maldi-tof ms, and gc-ms, accompanied by monosaccharide and methylation analysis. it was concluded that the o-specific polysaccharide is composed of a hexasaccharide repeating units inte ...201020003963
inhibition of the early stage of salmonella enterica serovar enteritidis biofilm development on stainless steel by cell-free supernatant of a hafnia alvei culture.compounds present in hafnia alvei cell-free culture supernatant cumulatively negatively influence the early stage of biofilm development by salmonella enterica serovar enteritidis on stainless steel while they also reduce the overall metabolic activity of s. enteritidis planktonic cells. although acylhomoserine lactones (ahls) were detected among these compounds, the use of several synthetic ahls was not able to affect the initial stage of biofilm formation by this pathogen.201020097823
histamine, cadaverine, and putrescine produced in vitro by enterobacteriaceae and pseudomonadaceae isolated from spinach.a total of 364 bacterial isolates, obtained from spinach leaves, were assayed in a decarboxylase broth containing histidine, lysine, and ornithine to check their ability to produce biogenic amines, and then quantified by high-performance liquid chromatography. among these isolates, 240 formed cadaverine, 208 formed putrescine, and 196 formed histamine, in widely varying amounts. they frequently produced more than one biogenic amine. klebsiella pneumoniae subsp. pneumoniae and morganella morganii ...201020132689
biofilm formation and acyl homoserine lactone production in hafnia alvei isolated from raw milk.the objective of this study was to detect the presence of acyl homoserine lactones (ahls), signal molecules of the quorum sensing system in biofilm formed by hafnia alvei strains. it also evaluated the effect of synthetic quorum sensing inhibitors in biofilm formation. ahls were assayed using well diffusion techniques, thin layer chromatography (tlc) and detection directly in biofilm with biomonitors. the extracts obtained from planktonic and sessile cell of h. alvei induced at least two of thre ...201020140298
[report of four clinical cases of hafnia alvei bacteremia in a pediatric cardiac surgery unit].the gram-negative bacillus hafnia alvei is the only species of the genus hafnia, family enterobacteriaceae. it occasionally behaves as an opportunistic pathogen in humans, causing intestinal and respiratory infection and sepsis. it rarely causes bacteremia, usually of unknown focus.201020140313
an unusual organism for pd-related peritonitis: hafnia alvei. 201020200377
production of biogenic amines "in vitro" in relation to the growth phase by enterobacteriaceae species isolated from traditional sausages.histidine, lysine, ornithine and tyrosine decarboxylase activities were tested in 79 strains of enterobacteriaceae (41 of hafnia alvei, 17 of serratia liquefaciens, 5 of enterobacter cloacae, 4 of citrobacter braakii, 2 of proteus vulgaris, 2 of proteus mirabilis, 2 of providencia stuartii, 2 of klebsiella terrigena, 1 of rahnella aquatilis, 1 of salmonella arizonae, 1 of citrobacter youngae and 1 of escherichia coli) isolated from botillo, a spanish traditional sausage. in general, the strains ...201020673614
selective testing of ß-galactosidase activity in the laboratory identification of salmonella and shigella species.salmonella and shigella species are pathogens of great medical and public health importance. however, laboratory identification of these organisms is time consuming. using current standard laboratory algorithms, the vast majority of organisms submitted for serological typing with salmonella-specific and shigella-specific antisera are not clinically significant.201020924038
improved selective and differential medium for isolation of escherichia coli o157:h7.gmac, a modified version of sorbitol macconkey medium (smac), was produced with a reduced quantity of selective agents and incorporated gentiobiose. gmac supported a higher recovery rate of heat- or acid-injured escherichia coli o157:h7 cells than smac with cefixime and tellurite (ct-smac), while differentiating e. coli o157:h7 from sorbitol-nonfermenting hafnia alvei.201020980579
characterization of the enterobacteriaceae community that developed during storage of minced beef under aerobic or modified atmosphere packaging conditions.the whole cell protein and macrorestriction analysis of dna of enterobacteriaceae isolates recovered from minced beef stored at 0, 5, 10 and 15 °c aerobically and under modified atmosphere packaging consisting of 40% co(2)-30% o(2)-30% n(2) in the presence (map+) and absence (map-) of oregano essential oil were studied. sodium dodecyl sulphate polyacrylamide gel electrophoresis (sds-page) profiles obtained from whole cell protein analysis of the enterobacteriaceae isolates revealed seven groups. ...201021216482
hafnia alvei pyelonephritis in a renal transplant recipient: case report and review of an under-recognized nosocomial pathogen.a.p. cardile, d. forbes, v. cirigliano, b. stout, n.p. das, g. hsue. hafnia alvei pyelonephritis in a renal transplant recipient: case report and review of an under-recognized nosocomial pathogen. transpl infect dis 2011: 13: 407-410. all rights reserved abstract: we describe the first case to our knowledge of hafnia alvei pyelonephritis in a renal transplant recipient. clinicians should consider this under-recognized pathogen when clinically evaluating immunosuppressed patients with a history o ...201121299775
a case of bacteremia caused by hafnia paralvei.the genus hafnia, a member of the enterobacteriaceae, is widespread in nature and rarely causes human infection. we describe a case of an 85-year-old japanese man hospitalized consequent to suspected cholecystitis, in which hafnia sp. was recovered from the blood culture concomitantly with enterococcus faecalis. sequencing of the 16s ribosomal rna gene sequence and phenotyping with id 32 e revealed that the recovered hafnia sp. was considered to be hafnia alvei genomosp. 2 (atcc 29927), recently ...201121553084
yokenella regensburgei in an immunocompromised host: a case report and review of the literature.yokenella regensburgei belongs to the enterobacteriaceae and shares some biochemical characteristics with hafnia alvei. a few case reports have suggested that it is an opportunistic pathogen, but there is no strong evidence to support its clinical importance. until recently, it was difficult to accurately differentiate between y. regensburgei and h. alvei by use of routine identification techniques. here, we present a case of soft tissue infection and bacteremia caused by y. regensburgei, which ...201121706224
clinical and laboratory diagnostic characteristics and cytotoxigenic potential of hafnia alvei and hafnia paralvei strains.a collection of 68 strains of hafnia previously identified to species by 16s rrna gene sequencing were investigated for simple phenotypic properties that could aid in their recognition in the clinical laboratory. four tests including malonate utilization, fermentation of salicin and d-arabinose, and expression of ß-glucosidase activity correctly assigned each strain to either h. alvei or h. paralvei. antibiotic susceptibility profiles for 35 hafnia alvei and hafnia paralvei isolates were generat ...201121795516
new functional ligands for ficolin-3 among lipopolysaccharides of hafnia alvei.ficolin-1 (m), ficolin-2 (l), ficolin-3 (h) and mannan-binding lectin (mbl) activate the complement system and have opsonic activity. the specificity of ficolin-3 is poorly characterized and currently limited to a few ligands only. we present new specific targets for human ficolin-3, identified among lipopolysaccharides (lpss, endotoxin) of hafnia alvei. the interaction was restricted to lpss of four strains: 23, polish collection of microorganisms (pcm) 1200, pcm 1203 and pcm 1205 and limited t ...201121890891
necrotizing fasciitis following endoscopic harvesting of the greater saphenous vein for coronary artery bypass graft.the greater saphenous vein (gsv) remains the most commonly harvested conduit for revascularization in coronary artery bypass grafting (cabg). published literature shows that minimally invasive vein harvesting techniques have a significantly lower incidence of wound infection rates than conventional open vein harvesting techniques have. we report a case of necrotizing fasciitis, an infection with a mortality rate of 30% to 50%, after endoscopic harvesting of the greater saphenous vein to be used ...201121902951
microbiological characteristics of precooked, vacuum-packaged uncured beef and pork.microbiological examination of 29 packages of precooked, vacuum-packaged beef and pork products purchased at local and regional supermarkets along with 110 packages of precooked, vacuum-packaged, sliced roast beef obtained from a major meat processor did not disclose the presence of escherichia coli, coagulase-positive staphylococcus aureus, clostridium perfringens or salmonella. the effects of storage temperature and length of storage on the microflora of 110 packages of sliced roast beef were ...198922056107
biogenic amines produced by enterobacteriaceae isolated from meat products.biogenic amines in ground meat and processed meat products are one of the indicators to determine the poor quality raw material. major histamine forming bacterium was escherichia coli (strain ec04 with 65.88 mg/100 ml in brain heart infusion medium), followed by the microorganisms morganella morganii (strain mm4 with 8.40 mg/100 ml and strain mm7 with 8.28 mg/100 ml) and proteus mirabilis (strain pm02 with 8.76 mg/100 ml), respectively. the highest putrescine production level was found in citrob ...200122062111
a note on escherichia coli o157:h7 serotype in turkish meat products.255 minced beef, 101 soudjouk and 50 uncooked hamburger samples were analyzed for the presence of escherichia coli o157:h7 serotype. m-ec and lst broths were used as selective enrichment media and smac agar was used as a selective isolation medium. a total of 3 e. coli o157 were isolated by conventional culture techniques; one from each of minced beef, uncooked hamburger and soudjouk but none were identified as the h7 serotype. for determination of selective media-growing cohabitant bacteria, 26 ...200022062162
Identification of Yersinia ruckeri from diseased salmonid fish by Fourier transform infrared spectroscopy.Yersinia ruckeri is the causative agent of enteric redmouth disease (ERM), which mainly affects salmonid fish. Isolates of Y. ruckeri from diseased salmonid fish were obtained over a 6-year period from eight fish farms in the State of Baden-Württemberg, Southwest Germany. The strains were characterized by biochemical methods and Fourier transform infrared spectroscopy (FT-IR) combined with artificial neural network analysis. These methods were complemented by 16S rDNA sequencing for several isol ...201222103737
identification of the methyl phosphate substituent at the non-reducing terminal mannose residue of the o-specific polysaccharides of klebsiella pneumoniae o3, hafnia alvei pcm 1223 and escherichia coli o9/o9a lps.o-specific polysaccharides of gram-negative bacteria are synthesized by two different mechanisms: polymerization of the pre-formed o-repeating unit or sequential addition of the monosaccharides to the growing polysaccharide chain. in the second case, growth of the polymer can be further subdivided into two groups depending on the presence or absence of a special monosaccharide or non-sugar substituent that terminates the glycan. a family of polymannose o-polysaccharides provides prototypes for t ...201122169179
Ecological and aromatic impact of two Gram-negative bacteria (Psychrobacter celer and Hafnia alvei) inoculated as part of the whole microbial community of an experimental smear soft cheese.The impact of the growth of two Gram-negative bacteria, Psychrobacter celer and Hafnia alvei, inoculated at 10(2) and 10(6)cfu/g, on the dynamics of a multispecies community as well as on volatile aroma compound production during cheese ripening was investigated. Results showed that P. celer was able to successfully implant itself in cheese, regardless of its inoculation level. However, when it was inoculated at a high level, the bacterial biodiversity was drastically lowered from day 25 to the ...201122177851
impact of gram-negative bacteria in interaction with a complex microbial consortium on biogenic amine content and sensory characteristics of an uncooked pressed cheese.the impact of gram-negative bacteria on sensory characteristics and production of volatile compounds as well as biogenic amines (ba) in the core of an uncooked pressed type model cheese was investigated in the presence of a defined complex microbial consortium. eleven strains of gram-negative bacteria, selected on the basis of their biodiversity and in vitro ba-production ability, were individually tested in a model cheese. four out of 6 strains of enterobacteriaceae (citrobacter freundii ucma 4 ...201122265286
characterisation of the spoilage microbiota in raw salmon (salmo salar) steaks stored under vacuum or modified atmosphere packaging combining conventional methods and pcr-ttge.in order to characterise the spoilage related to microbiota of raw salmon, a combination of culture-dependent and -independent methods, including pcr-ttge, was used to analyse 3 raw salmon batches stored for 3 days at chilled temperature in modified atmosphere packaging (map) (50% co₂/50% n₂) or under vacuum. sensory evaluation, microbiological enumeration and chemical analysis were performed after 3, 7 and 10 days of storage. at the onset of spoilage, 65 bacterial isolates were picked from the ...201122265297
increased iga and igm responses against gut commensals in chronic depression: further evidence for increased bacterial translocation or leaky gut.recently, we discovered that depression is accompanied by increased igm and iga responses directed against gram negative gut commensals. the aim of this study was to replicate these findings in a larger study group of depressed patients and to examine the associations between the iga and igm responses to gut commensals and staging of depression as well as the fatigue and somatic (f&s) symptoms of depression.201222410503
transferable integrons of gram-negative bacteria isolated from the gut of a wild boar in the buffer zone of a national park.the aim of this study was to determine the presence of integron-bearing gram-negative bacteria in the gut of a wild boar (sus scrofa l.) shot in the buffer zone of a national park. five gram-negative strains of escherichia coli, serratia odorifera, hafnia alvei and pseudomonas sp. were isolated. four of these strains had class 2 integrase (inti2), and one harbored class 1 integrase (inti1). the integron-positive strains were multiresistant, i.e., resistant to at least three unrelated antibiotics ...201122661922
[gram-negative bacteria influence on the ability of the arginine-vasotocin to stimulate osmotic permeability of the frog urinary bladder epithelium].the influence of endogenous gram-negative bacteria colonizing the mucosal epithelium of frog rana temporaria l. urinary bladders (fub) on arginine-vasotocin avt-stimulated osmotic water flow in isolated urinary bladders was investigated. 170 animals were examined and only 40% were contaminated with gram-negative bacteria (about 10(3)-10(6) cfu per hemibladder). several enterobacteriaceae species were identified (hafnia alvei, 36.7%, e. coli, 32.3%, serratia marcescens, 8.8%, citrobacter freundii ...201222834340
the bactericidal activity of normal human serum against enterobacteriaceae rods with lipopolysaccharides possessing o-antigens composed of mannan.the susceptibility of bacteria to the bactericidal activity of serum depends on the structure and organization of the bacterial outer membrane. it is known that the structure of the o-specific polysaccharide chain of lipopolysaccharide (lps) plays an important role in the resistance of bacteria to host immune defenses.201223214191
studies on the o-antigen of hafnia alvei pcm 1224 structurally and serologically related to the o-antigen of h. alvei 481-l.mild hydrolysis of the lipopolysaccharide of hafnia alvei pcm 1224 at ph 4.2 cleaved partially the o-polysaccharide chain by the glycosyl phosphate linkages to yield a phosphorylated hexasaccharide representing the repeating unit of the o-polysaccharide and higher oligosaccharides consisting of two or more repeating units. studies of the degradation products before and after dephosphorylation by sugar and methylation analyses along with 1d and 2d (1)h and (13)c nmr spectroscopy, including 2d (1) ...201323276652
behavior of escherichia coli o26:h11 in the presence of hafnia alvei in a model cheese ecosystem.this study was designed to evaluate the capacity of three hafnia strains to inhibit the growth of an e. coli strain o26:h11 in an uncooked pressed model cheese, in the presence or absence of a microbial consortium added to mimic a cheese microbial community. inoculated at 2 log cfu/ml into pasteurized milk without hafnia, the e. coli o26:h11 strain reached 5 log cfu/g during cheese-making and survived at levels of 4 to 5 log cfu/g beyond 40 days. inoculated into milk at 6 log cfu/ml, all three t ...201223290227
evaluation of the spoilage potential of bacteria isolated from spoiled raw salmon (salmo salar) fillets stored under modified atmosphere packaging.the spoilage potential of eight bacterial groups/species (serratia spp., hafnia alvei, brochothrix thermosphacta, carnobacterium maltaromaticum, shewanella baltica, lactococcus piscium, photobacterium phosphoreum, "other enterobacteriaceae" [containing one strain of moellerella sp., morganella sp. and pectobacterium sp.]) isolated from spoiled raw salmon fillets stored under modified atmosphere packaging (map) was evaluated by inoculation into sterile raw salmon cubes followed by storage for 12d ...201223290229
hafnia alvei and hafnia paralvei. taxonomy defined but still far from virulence and pathogenicity. 201323290572
identification of the enterobacteriaceae in montasio cheese and assessment of their amino acid decarboxylase activity.the aim of the study was to identify the species of enterobacteriaceae present in montasio cheese and to assess their potential to produce biogenic amines. plate count methods and an enterobacterial repetitive intergenic consensus polymerase chain reaction (eric-pcr) approach, combined with 16s rdna sequencing, were used to investigate the enterobacteriaceae community present during the cheesemaking and ripening of 6 batches of montasio cheese. additionally, the potential decarboxylation abiliti ...201323298547
hafnia alvei from the farm to the delivery room. 201323317805
isolation and characterization of bacteriophages specific to hydrogen-sulfide-producing bacteria.the objectives of this study were to isolate and characterize bacteriophages specific to hydrogen-sulfide-producing bacteria (spb) from raw animal materials, and to develop a spb-specific bacteriophage cocktail for rendering application. meat, chicken offal, and feather samples collected from local supermarkets and rendering processing plants were used to isolate spb (n = 142). bacteriophages (n = 52) specific to spb were isolated and purified from the above samples using 18 of those isolated sp ...201323391228
monitoring the succession of the biota grown on a selective medium for pseudomonads during storage of minced beef with molecular-based methods.in the present study, the succession of the biota grown on a selective medium for pseudomonads (pseudomonas agar based medium - pab) during the storage of meat under different conditions was monitored. thus, minced beef was stored aerobically and under modified atmosphere packaging in the presence (map+) and absence (map-) of oregano essential oil at 0, 5, 10 and 15 °c. a total of 267 pure cultures were recovered from pab throughout the storage period and subjected to pcr-denaturing gradient gel ...201223498179
predominant enterobacteria on modified-atmosphere packaged meat and poultry.enterobacteria on modified-atmosphere (ma) packaged meat (n = 54) and poultry (n = 32) products were enumerated, and 899 isolates were picked and ribotyped. for identification, 16s rrna genes of representative strains were sequenced and analyzed. altogether 54 (60%) of the samples contained enterobacteria >10(4) cfu/g. in 34% of the poultry samples, enterobacteria counts were >10(6) cfu/g suggesting that enterobacteria may contribute to spoilage of ma packaged poultry. the enterobacteria identif ...201223541191
new complete structure of hafnia alvei clinical isolate strain pcm 2670 semi-rough lipopolysaccharide.hafnia alvei strain pcm 2670 is a clinical isolate from a patient with chronic reproductive tract infection. the novel structure of the semi-rough lipopolysaccharide was established with the use of nmr spectroscopy and mass spectrometry as well as immunochemical techniques. according to the mass spectrometry data, heptose in the oligosaccharide is partially substituted by glycine. h. alvei pcm 2670 core structure encompasses the common core of h. alvei which is modified with two additional galac ...201323643833
bacterial microbiota of the ocular surface of captive and free-ranging microbats: desmodus rotundus, diameus youngi and artibeus lituratus.to investigate normal aerobic bacterial microbiota of the eye surface in vvcaptive and free-ranging bats belonging to the suborder microchiroptera.201423710696
degradation of phytate by the 6-phytase from hafnia alvei: a combined structural and solution study.phytases hydrolyse phytate (myo-inositol hexakisphosphate), the principal form of phosphate stored in plant seeds to produce phosphate and lower phosphorylated myo-inositols. they are used extensively in the feed industry, and have been characterised biochemically and structurally with a number of structures in the pdb. they are divided into four distinct families: histidine acid phosphatases (hap), β-propeller phytases, cysteine phosphatases and purple acid phosphatases and also split into thre ...201323741456
identification of enterobacteriaceae by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry using the vitek ms system.this multicenter study evaluated the accuracy of matrix-assisted laser desorption/ionization time-of-flight (maldi-tof) mass spectrometry identifications from the vitek ms system (biomérieux, marcy l'etoile, france) for enterobacteriaceae typically encountered in the clinical laboratory. enterobacteriaceae isolates (n = 965) representing 17 genera and 40 species were analyzed on the vitek ms system (database v2.0), in accordance with the manufacturer's instructions. colony growth (≤72 h) was app ...201323818163
elaboration of highly hydrophobic polymeric surface - a potential strategy to reduce the adhesion of pathogenic bacteria?different polymeric surfaces have been modified in order to reach a high hydrophobic character, indeed the superhydrophobicity property. for this purpose, polypropylene and polystyrene have been treated by rf or μwaves cf4 plasma with different volumes, the results were compared according to the density of injected power. the effect of pretreatment such as mechanical abrasion or plasma activation was also studied. the modified surfaces were shown as hydrophobic, or even superhydrophobic dependin ...201223827554
colonization of frog rana temporaria l. urinary bladder by gram-negative bacteria leads to decreased effect of arginine-vasotocin on water reabsorption from the urinary bladder.in frogs and toads the urinary bladder is very important for the maintenance of water balance due to its ability to store water which can be reabsorbed under the action of arginine-vasotocin (avt). the usage of isolated bladders as a model for studying the osmotic water permeability (owp) regulation has a disadvantage which relates to high variability of avt effect among individuals, some showing insensitivity to the hormone. we hypothesized that the response of the bladder to avt could depend o ...201323836531
reprint of "new complete structure of hafnia alvei clinical isolate strain pcm 2670 semi-rough lipopolysaccharide".hafnia alvei strain pcm 2670 is a clinical isolate from a patient with chronic reproductive tract infection. the novel structure of the semi-rough lipopolysaccharide was established with the use of nmr spectroscopy and mass spectrometry as well as immunochemical techniques. according to the mass spectrometry data, heptose in the oligosaccharide is partially substituted by glycine. h. alvei pcm 2670 core structure encompasses the common core of h. alvei which is modified with two additional galac ...201323927934
culture-independent identification of bacteria associated with ovine 'broken mouth' periodontitis.'broken mouth' periodontitis (bmp) is a painful condition of sheep grazed on rough pasture and involves periodontal infection of the incisor teeth and progressive tooth loss. this can reduce the efficiency of grazing of sheep, which contributes to malnutrition, weight loss, systemic health problems, poor quality of life and early culling from flocks. consequently, this condition is a major economic problem to sheep farmers. however, there are no treatment or control methods available. the aim of ...201323928119
heat resistance of histamine-producing bacteria in irradiated tuna loins.consumption of foods high in biogenic amines leads to an illness known as histamine, or scombrotoxin, poisoning. the illness is commonly associated with consumption of fish with high levels of histamine ( $ 500 ppm). the objective of this study was to determine and compare the heat resistance of five histamine-producing bacteria in irradiated albacore tuna loins. heat-resistance parameters (d- and z-values) were determined for morganella morganii, raoultella planticola, hafnia alvei, and enterob ...201323992506
the italian hafnia alvei strain lmg 27376 is hafnia paralvei. 201324051127
role of 30 kda antigen of enteric bacterial pathogens as a possible arthritogenic factor in post-dysenteric reactive arthritis.reactive arthritis (rea)/reiter's syndrome (rs) may be caused as a sequel of infections caused by enteric bacterial pathogens, although the mechanisms through, which different pathogens cause similar disease are not clear.201324152499
microbial diversity and dynamics during the production of may bryndza cheese.diversity and dynamics of microbial cultures were studied during the production of may bryndza cheese, a traditional slovak cheese produced from unpasteurized ewes' milk. quantitative culture-based data were obtained for lactobacilli, lactococci, total mesophilic aerobic counts, coliforms, e. coli, staphylococci, coagulase-positive staphylococci, yeasts, fungi and geotrichum spp. in ewes' milk, curd produced from it and ripened for 0 - 10 days, and in bryndza cheese produced from the curd, in th ...201424291178
recovery of hafnia alvei from diseased brown trout, salmo trutta l., and healthy noble crayfish, astacus astacus (l.), in bulgaria.hafnia alvei was isolated in bulgaria from healthy noble crayfish, astacus astacus (l.), and then from farmed diseased brown trout, salmo trutta l., with signs of haemorrhagic septicaemia. the isolates were identified initially with conventional phenotyping and commercial merlin micronaut and api 20e rapid identification systems, followed by sequencing of the 16s rrna gene. hafnia alvei bt1, bt2 and aa4 were of low virulence to rainbow trout and brown trout, although cytotoxicity was demonstrate ...201424422558
improving the secretion of cadaverine in corynebacterium glutamicum by cadaverine-lysine antiporter.cadaverine (1,5-pentanediamine, diaminopentane), the desired raw material of bio-polyamides, is an important industrial chemical with a wide range of applications. biosynthesis of cadaverine in corynebacterium glutamicum has been a competitive way in place of petroleum-based chemical synthesis method. to date, the cadaverine exporter has not been found in c. glutamicum. in order to improve cadaverine secretion, the cadaverine-lysine antiporter cadb from escherichia coli was studied in c. glutami ...201424510022
quorum sensing activity of hafnia alvei isolated from packed food.quorum sensing (qs) is a mechanism adopted by bacteria to regulate expression of genes according to population density. n-acylhomoserine lactones (ahls) are a type of qs signalling molecules commonly found in gram-negative bacteria which have been reported to play a role in microbial spoilage of foods and pathogenesis. in this study, we isolated an ahl-producing hafnia alvei strain (fb1) from spherical fish pastes. analysis via high resolution triple quadrupole liquid chromatography/mass spectro ...201424736131
[comparison of routine use of two chromogenic media chromid cps (biomérieux) and uriselect4 (bio-rad) for the detection of escherichia coli and major uropathogenics in urine].escherichia coli is the most common bacterial cause of urinary tract infections. its rapid and specific identification in urine samples represents a major challenge within the rendering results and optimizing the management of the patient. we aimed to compare the sensitivity and specificity of two commercially available chromogenic media for e. coli: chromid cps (biomérieux) and uriselect4 (bio(-)rad), without carrying out further tests. 99 consecutive and non-redundant urine samples considered ...201424736143
conversion of glycerol to 1,3-propanediol by citrobacter freundii and hafnia alvei - newly isolated strains from the enterobacteriaceae.in this study, nearly 4000 bacterial strains from the family of enterobacteriaceae isolated from different environments were screened for ability to convert glycerol to 1,3-propanediol (1,3-pd). the aim of the research was to isolate 1,3-pd producers from the natural environment, identify and characterize the best isolates. three selective media were tested to usefulness in the isolation of bacteria from the family enterobacteriaceae. only, 28% of examined isolates could synthesize 1,3-pd from g ...201424768868
occurrence of urinary tract infection in adolescent and adult women of shanty town in dhaka city, bangladesh.urinary tract infection (uti) is commonly experienced by women of various age groups especially elderly ones. we planned to find out the prevalent microbial strains causing uti in slum inhabitant adolescent and adult women in dhaka city, bangladesh.201424795516
gene clusters of hafnia alvei strain fb1 important in survival and pathogenesis: a draft genome perspective.hafnia alvei is an opportunistic pathogen involved in various types of nosocomical infections. the species has been found to inhabit food and mammalian guts. however, its status as an enteropathogen, and whether the food-inhabiting strains could be a source of gastrointestinal infection remains obscure. in this report we present a draft genome of h. alvei strain fb1 isolated from fish paste meatball, a food popular among malaysian and chinese populations. the data was generated on the illumina m ...201425075225
comparison of identification systems for psychrotrophic bacteria isolated from raw bovine milk.psychrotrophic bacteria in raw milk produce heat-resistant extracellular proteases, resulting in spoilage and shelf-life reduction of ultrahigh temperature treated milk and milk products. controlling of these spoilage microbes requires rapid and reliable identification systems for screening of raw milk. this study aimed to compare commercial bacterial identification systems with a genetic method (considered as the 'gold standard' method) for the identification of heat-resistant protease producin ...201425113043
chemical composition and antibacterial activity of lavandula coronopifolia essential oil against antibiotic-resistant bacteria.the aim of this study was to analyse the composition of the essential oil (eo) of lavandula coronopifolia from morocco and to evaluate its in vitro antibacterial activity against antibiotic-resistant bacteria isolated from clinical infections. the antimicrobial activity was assessed by a broth micro-well dilution method using multiresistant clinical isolates of 11 pathogenic bacteria: klebsiella pneumoniae subsp. pneumoniae, klebsiella ornithinolytica, escherichia coli, enterobacter cloacae, ent ...201525174508
ficolin-3 activity towards the opportunistic pathogen, hafnia alvei.ficolin-3 (also called h-ficolin or hakata antigen) is a complement-activating pattern recognition molecule, possessing a fibrinogen-like domain involved in carbohydrate binding. amongst human ficolins, ficolin-3 has the highest concentration in serum and is the most potent lectin pathway activator in vitro. evidence for its physiological function is sparse, although its deficiency has been suggested to increase susceptibility to infections. the specificity of ficolin-3 is poorly characterized a ...201525178935
aerobic bacterial microbiota isolated from the cloaca of the european pond turtle (emys orbicularis) in poland.we conducted a comparative analysis of the aerobic cloacal bacteria of european pond turtles (emys orbicularis) living in their natural environment and juvenile turtles reared under controlled conditions in a breeding center. we included 130 turtles in the study. the aerobic bacteria isolated from the cloaca of the juvenile turtles were less diverse and more prevalent than the bacteria isolated from free-living adults. we isolated 17 bacterial species from juvenile captive turtles, among which t ...201525380369
hypothetical glycerol pathways of newly isolated strains capable of 1,3-propanediol production.study presented here demonstrates the ability of three newly isolated strains, obtained from environmental probes (manure, bottom sediment, and food waste) and identified as clostridium bifermentans, clostridium butyricum, and hafnia alvei, to synthesize 1,3-propanediol (1,3-pd), organic acids (such as lactic, acetic, fumaric, succinic, and butyric acids), and ethanol from glycerol. the production of 1,3-pd as well as the glycerol pathways in c. bifermentans and h. alvei cells have not been inve ...201425473655
a methodological approach to screen diverse cheese-related bacteria for their ability to produce aroma compounds.microorganisms play an important role in the development of cheese flavor. the aim of this study was to develop an approach to facilitate screening of various cheese-related bacteria for their ability to produce aroma compounds. we combined i) curd-based slurry medium incubated under conditions mimicking cheese manufacturing and ripening, ii) powerful method of extraction of volatiles, headspace trap, coupled to gas chromatography-mass spectrometry (hs-trap-gc-ms), and iii) metabolomics-based me ...201525475278
occurrence of glycine in the core oligosaccharides of hafnia alvei lipopolysaccharides--identification of disubstituted glycoform.endotoxins (lipopolysaccharides, lps) are the main surface antigens and virulence factors of gram-negative bacteria involved for example in the development of nosocomial infections and sepsis. they consist of three main regions: o-specific polysaccharide, core oligosaccharide, and lipid a. bacteria modify lps structure to escape the immune defence, but also to adapt to environmental conditions. lps's structures are highly diversified in the o-specific polysaccharide region to evade bactericidal ...201525541016
evaluating the occurrence of escherichia albertii in chicken carcass rinses by pcr, vitek analysis, and sequencing of the rpob gene.escherichia albertii is a recently described species that has been associated with gastroenteritis in humans and with healthy and ill birds. most recently, it has been identified as the causative agent in a food-borne outbreak in japan. the distribution and clinical importance of e. albertii are not well studied because its importance is unclear. culture methods for clinical isolation frequently miss e. albertii or incorrectly identify it as shigella spp., escherichia coli, or hafnia alvei. this ...201525548040
hafnia psychrotolerans sp. nov., isolated from lake water.a psychrotolerant, gram-stain-negative, motile, aerobic, peritrichous bacterium, strain djc1-1(t), was isolated from lake dajiaco, tibetan plateau, china. the strain was negative for citrate utilization, lipase activity and α-glucosidase, but positive for the voges-proskauer reaction and n-acetyl-β-glucosaminidase. 16s rrna gene sequence analysis indicated that hafnia paralvei atcc 29927(t), hafnia alvei atcc 13337(t), serratia grimesii dsm 30063(t) and serratia plymuthica dsm 4540(t) were the c ...201525563917
pyrosequencing analysis of microbial community and food-borne bacteria on restaurant cutting boards collected in seri kembangan, malaysia, and their correlation with grades of food premises.this study adopts the pyrosequencing technique to identify bacteria present on 26 kitchen cutting boards collected from different grades of food premises around seri kembangan, a city in malaysia. pyrosequencing generated 452,401 of total reads of otus with an average of 1.4×10(7) bacterial cells/cm(2). proteobacteria, firmicutes and bacteroides were identified as the most abundant phyla in the samples. taxonomic richness was generally high with >1000 operational taxonomic units (otus) observed ...201525679309
draft genome sequence of hafnia paralvei strain gta-haf03.hafnia paralvei is a gram-negative member of the enterobacteriaceae family, closely related to the opportunistic pathogen hafnia alvei. we report here the first draft genome sequence of h. paralvei, from the beef trim isolate gta-haf03, consisting of a 5.0-mbp assembly encoding 4,382 proteins and 90 predicted rnas.201525700416
isolation and identification of enterobacteriaceae from raw horsemeat intended for human consumption (basashi).the status of enterobacteriaceae contamination was investigated in a total of 131 samples of raw horsemeat (basashi) intended for human consumption purchased from a general meat shop or by mail-order from october 2012 to december 2013. the bacteria were isolated from 105 of the 112 samples (93.8%). prominent differences in the isolation rate due to the place of manufacture/sale or by the cut of the meat were not observed. moreover, in a comparison between domestic (92.6%) and imported (100%) sam ...201425744214
antibacterial susceptibility of enterobacteriaceae isolated from raw horsemeat isolated for human consumption (basashi).drug susceptibility testing was carried out using 14 antibiotics in order to identify trends in the antibiotic tolerance of 142 strains of enterobacteriaceae isolated from horsemeat commercially available for raw consumption (basashi). a comparison of the sensitivity to the 14 antibiotics using the 90% mic (minimum inhibitory concentration) values (mic90) showed the strongest tolerance to ampicillin (abpc) at a concentration of > 128 μg/ml, followed by that to fosfomycin (fom) at a concentration ...201525817809
prevalence and characterization of esbl- and ampc-producing enterobacteriaceae on retail vegetables.in total 1216 vegetables obtained from dutch stores during 2012 and 2013 were analysed to determine the prevalence of 3rd-generation cephalosporin (3gc) resistant bacteria on soil-grown fresh produce possibly consumed raw. vegetables grown conventionally and organically, from dutch as well as foreign origin were compared. included were the following vegetable types; blanched celery (n=192), bunched carrots (n=190), butterhead lettuce (n=137), chicory (n=96), endive (n=188), iceberg lettuce (n=19 ...201525828704
purification, biochemical characterization, and genetic cloning of the phytase produced by burkholderia sp. strain a13.a phytase-producing bacterium, burkholderia sp. a13 (jcm 30421), was isolated from lake kasumigaura by enrichment cultivation using minimum medium containing phytic acid as the sole phosphorus source. the phytase production by strain a13 was induced by the presence of phytic acid and repressed by the addition of glucose. the purified enzyme had a molecular weight of 44 kda and a phytase activity of 174 μmol min(-1) mg(-1). the enzyme showed broad substrate specificity, but the highest activity w ...201525833676
hafnia alvei urosepsis in a kidney transplant patient.hafnia alvei, a gram-negative facultative anaerobic, rod-shaped bacterium, is a rare cause of infection in humans. we report on a renal transplant patient who developed h. alvei pyelonephritis and urosepsis. the source of infection remains enigmatic but is most likely the intestinal tract. appropriate antibiotic therapy with cefepime followed by oral ciprofloxacin brought about rapid resolution of symptoms and complete recovery. h. alvei may cause severe infection in transplant patients without ...201525960912
antibiotic resistance of gram-negative benthic bacteria isolated from the sediments of kardzhali dam (bulgaria).the aim of the present study was to carry out a preliminary assessment for the occurrence of bacterial strains resistant to frequently used antibiotics in the sediments beneath the sturgeon cage farm in kardzhali dam (bulgaria). samples were taken from the top 2 cm of sediments under a fish farm and from a control station in the aquatory of the reservoir in the period july-october 2011. surveillance of bacterial susceptibility to 16 antimicrobial agents was performed for 160 gram-negative strain ...201526019641
molecular characteristics of extended-spectrum cephalosporin-resistant enterobacteriaceae from humans in the community.to investigate the molecular characteristics of extended-spectrum cephalosporin (esc)-resistant enterobacteriaceae collected during a cross-sectional study examining the prevalence and risk factors for faecal carriage of extended-spectrum β-lactamase (esbl)-producing enterobacteriaceae in humans living in areas with high or low broiler density.201526029910
application of bacteriophages to reduce biofilms formed by hydrogen sulfide producing bacteria on surfaces in a rendering plant.hydrogen sulfide producing bacteria (spb) in raw animal by-products are likely to grow and form biofilms in the rendering processing environments, resulting in the release of harmful hydrogen sulfide (h2s) gas. the objective of this study was to reduce spb biofilms formed on different surfaces typically found in rendering plants by applying a bacteriophage cocktail. using a 96-well microplate method, we determined that 3 spb strains of citrobacter freundii and hafnia alvei are strong biofilm for ...201526102989
microbial cell-free extracts as sources of enzyme activities to be used for enhancement flavor development of ewe milk cheese.freeze-dried cell-free extracts (cfe) from lactobacillus casei lc01, weissella cibaria 1xf5, hafnia alvei moller atcc 51815, and debaryomyces hansenii lcf-558 were used as sources of enzyme activities for conditioning the ripening of ewe milk cheese. compared with control cheese (cc), cfe did not affect the gross composition and the growth of the main microbial groups of the cheeses. as shown through urea-page electrophoresis of the ph 4.6-soluble nitrogen fraction and the analysis of free aa, t ...201526142846
microbiology and foodborne pathogens in honey.honey has been considered a relatively safe foodstuff due to its compositional properties, with infant botulism caused by clostridium botulinum being the most prominent health risk associated with it. our review is focused on the honey microflora along the food chain and evaluates the pathogenic potential of those microorganisms found in honey. this product may contain a great variety of bacteria and, particularly, fungi that eventually entered the food chain at an early stage (e.g., via pollen) ...201726176586
microbiota and metabolome of un-started and started greek-type fermentation of bella di cerignola table olives.this study aimed to utilize an "omics" approach to evaluate the ability of selected lactobacilli and yeasts to improve the fermentation process of bella di cerignola table olives. four types of fermentations were performed at the pilot-plant scale: un-started fermented olives used as a control (ctrl); olives started with a commercial lactobacillus plantarum strain (s); commercial l. plantarum strain and autochthonous yeast wickeramomyces anomalus disspa73 (sy); and l. plantarum, w. anomalus diss ...201526338113
a broadband capacitive sensing method for label-free bacterial lps detection.in this paper, the authors present a new type of highly sensitive label-free microwave sensor in a form of interdigital capacitor coated with t4 bacteriophage gp37 adhesin. the adhesin binds escherichia coli b (e. coli b) by precise recognizing its bacterial host lipopolysaccharide (lps). the c-terminal part of the adhesin consists of the receptor-binding amino acid residues which are involved in a specific interaction with two terminal glucose residues of the bacterial lps. the change of the se ...201626339930
periodontal-disease-associated biofilm: a reservoir for pathogens of medical importance.the ecological diversity of the periodontal microenvironment may provide suitable conditions for the colonization of species not usually considered members of the oral microbiota. in this investigation, we aimed to determine the prevalence and levels of pathogenic species of medical relevance in the microbiota of individuals with distinct periodontal clinical status. subgingival biofilm was obtained from patients with periodontal health (h, n = 81), gingivitis (g, n = 55), generalized aggressive ...201626416306
survival of cheese-ripening microorganisms in a dynamic simulator of the gastrointestinal tract.a mixture of nine microorganisms (six bacteria and three yeasts) from the microflora of surface-ripened cheeses were subjected to in vitro digestive stress in a three-compartment "dynamic gastrointestinal digester" (didgi). we studied the microorganisms (i) grown separately in culture medium only (ii) grown separately in culture medium and then mixed, (iii) grown separately in culture medium and then included in a rennet gel and (iv) grown together in smear-ripened cheese. the yeasts geotrichum ...201626611167
control of shigatoxin-producing escherichia coli in cheese by dairy bacterial strains.bio-preservation could be a valuable way to control shigatoxin-producing escherichia coli (stec) in cheese. to this end, 41 strains were screened for their inhibitory potential on model cheese curd and on pasteurized and raw milk uncooked pressed cheeses. strains of lactococcus lactis, lactococcus garvieae, leuconostoc pseudomesenteroides, leuconostoc citreum, lactobacillus sp, carnobacterium mobile, enterococcus faecalis, enterococcus faecium, macrococcus caseolyticus and hafnia alvei reduced s ...201626678131
[morpho-functional characteristic of enterobacteria adhesive activity].study adhesive activity of enterobacteria in the model of hemagglutination reaction with animal and avian erythrocytes and clarify structures responsible for adhesion in enterobacteria.201626829846
the effect of reduced sodium chloride content on the microbiological and biochemical properties of a soft surface-ripened cheese.many health authorities have targeted salt reduction in food products as a means to reduce dietary sodium intake due to the harmful effects associated with its excessive consumption. in the present work, we evaluated the effect of reducing sodium chloride (nacl) content on the microbiological and biochemical characteristics of an experimental surface-ripened cheese. a control cheese (1.8% nacl) and a cheese with a reduced nacl content (1.3% nacl) were sampled weekly over a period of 27d. reducin ...201626852809
fractionation and analysis of lipopolysaccharide-derived oligosaccharides by zwitterionic-type hydrophilic interaction liquid chromatography coupled with electrospray ionisation mass spectrometry.lipopolysaccharide (lps, endotoxin) is a main surface antigen and virulence factor of gram-negative bacteria. regardless of the source of lps, this molecule, isolated from the smooth forms of bacteria, is characterised by a general structural layout encompassing three regions: (i) an o-specific polysaccharide (o-ps) - a polymer of repeating oligosaccharide units, (ii) core oligosaccharide (os), and (iii) the lipid a anchoring lps in the outer membrane of the cell envelope of gram-negative bacter ...201627085741
mycobacterial antigen 85 complex (ag85) as a target for ficolins and mannose-binding lectin.the pattern recognition molecules (prms) able to activate complement via the lectin pathway are suspected to be involved in the interaction between pathogenic mycobacteria and the host immune response. recently, we have found strong interactions between 25 and 35kda mycobacterial cell fractions and mannose-binding lectin (mbl) and ficolins. here we demonstrate that two biologically important mycobacterial structures, mannosylated lipoarabinomannan (manlam) and the antigen 85 (ag85) complex, indu ...201627141819
genetic diversity of o-antigens in hafnia alvei and the development of a suspension array for serotype detection.hafnia alvei is a facultative and rod-shaped gram-negative bacterium that belongs to the enterobacteriaceae family. although it has been more than 50 years since the genus was identified, very little is known about variations among hafnia species. diversity in o-antigens (o-polysaccharide, ops) is thought to be a major factor in bacterial adaptation to different hosts and situations and variability in the environment. antigenic variation is also an important factor in pathogenicity that has been ...201627171009
a new ligand-based method for purifying active human plasma-derived ficolin-3 complexes supports the phenomenon of crosstalk between pattern-recognition molecules and immunoglobulins.despite recombinant protein technology development, proteins isolated from natural sources remain important for structure and activity determination. ficolins represent a class of proteins that are difficult to isolate. to date, three methods for purifying ficolin-3 from plasma/serum have been proposed, defined by most critical step: (i) hydroxyapatite absorption chromatography (ii) n-acetylated human serum albumin affinity chromatography and (iii) anti-ficolin-3 monoclonal antibody-based affini ...201627232184
genome sequence of hafnia alvei bta3_1, a bacterium with antimicrobial properties isolated from honey bee gut.hafnia alvei bta3_1, a strain with antibacterial properties, was isolated from honey bee gut and cultured under aerobic and anaerobic conditions. to explore the potential genetic bases of its antibacterial and possible pathogenic properties, the complete genome of this organism was sequenced and analyzed.201627284146
whole-genome sequence of hafnia alvei humv-5920, a human isolate.a clinical isolate of hafnia alvei (strain humv-5920) was obtained from a urine sample from an adult patient. we report here its complete genome assembly using pacbio single-molecule real-time (smrt) sequencing, which resulted in a chromosome with 4.5 mb and a circular contig of 87 kb. about 4,146 protein-coding genes are predicted from this assembly.201627313299
dectin-2 recognizes mannosylated o-antigens of human opportunistic pathogens and augments lipopolysaccharide activation of myeloid cells.lps consists of a relatively conserved region of lipid a and core oligosaccharide and a highly variable region of o-antigen polysaccharide. whereas lipid a is known to bind to the toll-like receptor 4 (tlr4)-myeloid differentiation factor 2 (md2) complex, the role of the o-antigen remains unclear. here we report a novel molecular interaction between dendritic cell-associated c-type lectin-2 (dectin-2) and mannosylated o-antigen found in a human opportunistic pathogen, hafnia alvei pcm 1223, whic ...201627358401
antimicrobial resistance patterns of enterobacteriaceae in european wild bird species admitted in a wildlife rescue centre.wild birds have been considered to be reservoirs of enteric human pathogens and vectors of resistance dissemination to the environment. during annual migration, they potentially play a role in the epidemiology of human associated zoonoses. the aim of this study was to investigate the frequency of isolation and antimicrobial susceptibility profiles of enterobacteriaceae members isolated from cloacal swabs of common european wild birds. fifty-five cloacal swabs were taken during birds' entrance ev ...201627393875
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