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Tytuł:
Number of Streptococcus mutans and Lactobacillus in saliva versus the status of cigarette smoking, considering duration of smoking and number of cigarettes smoked daily
Autorzy:
Nakonieczna-Rudnicka, Marta
Bachanek, Teresa
Powiązania:
https://bibliotekanauki.pl/articles/991053.pdf
Data publikacji:
2017
Wydawca:
Instytut Medycyny Wsi
Tematy:
streptococcus mutans
lactobacillus
cotinine
smoking
Opis:
Introduction and objective. A large number of colonies of Streptococcus mutans (SM) and Lactobacillus (LB) cariogenic bacteria in the saliva show a high risk of dental caries development. Cotinine is a biomarker of exposure to the tobacco smoke. The aim of the study was assessment of the number of Streptococcus mutans and Lactobacillus in the saliva of nonsmokers and smokers considering the duration of smoking and the number of cigarettes smoked daily. The number of SM and LB was analysed in relation to the frequency of oral health check-ups. Materials and method. The investigated group comprised 124 people aged 20–54. 58 (46.8%) reported cigarette smoking; 66 (53.2%) reported they had never smoked cigarettes and had never attempted to smoke. Cotinine concentration in the saliva was assayed using the Cotinine test (Calbiotech), and the number of SM and LB with the use of the CRT bacteria test (Ivoclar Vivadent, Liechtenstein). Statistical analysis was conducted using Chi2 and Mann-Whitney tests. Test values of p<0.05 were considered statistically significant. Results. No essential correlation was stated between the number of SM and LB and the status of smoking, the number of cigarettes smoked daily and duration of cigarette smoking. Smokers who reported having dental check-ups at least once a year significantly more frequently had a small number of LB stated in relation to people who had dental check-ups to control their oral health less frequently than once a year. Conclusion. The number of SM and LB in saliva does not depend on the smoking status, the number of cigarettes smoked daily and duration of smoking.
Źródło:
Annals of Agricultural and Environmental Medicine; 2017, 24, 3
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Endophthalmitis following cataract surgery in diabetic patients
Autorzy:
Maya-Sapira, Hanapi
Koh, Yi-Ni
Azhany, Yaakub
Zunaina, Embong
Khairy-Shame, Sonny-Teo
Liza-Sharmini, Ahm ad Tajuddin
Draman, Nani
Noordin, Zamri
Powiązania:
https://bibliotekanauki.pl/articles/552628.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Przyjaciół Medycyny Rodzinnej i Lekarzy Rodzinnych
Tematy:
endophthalmitis
cataract surgery
diabetes mellitus
Streptococcus mitis.
Źródło:
Family Medicine & Primary Care Review; 2017, 4; 431-436
1734-3402
Pojawia się w:
Family Medicine & Primary Care Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Molecular Diagnostic of Streptococcus thermophilus
Diagnostyka molekularna Streptococcus thermophilus
Autorzy:
Vanatkova, Z.
Okenkova, E.
Bunkova, L.
Drab, V.
Hrabe, J.
Powiązania:
https://bibliotekanauki.pl/articles/388393.pdf
Data publikacji:
2009
Wydawca:
Towarzystwo Chemii i Inżynierii Ekologicznej
Tematy:
Streptococcus thermophilus
PCR
RAPD
SDS-PAGE
Opis:
Streptococcus thermophilus is one of the most important lactic acid bacteria in the dairy industry. Despite the wide use of Streptococcus thermophilus in the industry, data on the phenotypic and genetic strain variations within the species are still limited. Genetic techniques are very useful for molecular discrimination of complex mixtures of starter and probiotic cultures in research laboratories. Detection and identification of various lactic acid bacteria species with rapid methods is often important for quality control of dairy products. This work deals with characterization and differentiation of strains Streptococcus thermophilus by PCR, RAPD and SDS-PAGE techniques. Fifteen strains of Streptococcus thermophilus from Czech Collection of Dairy Microorganisms (CCDM) and a strain of Streptococcus thermophilus from Czech Collection of Microorganisms (CCM) were used. Particular strains were confirmed with primer set THI/THII by PCR method. Consequently, their identities were examined by RAPD and SDS-PAGE techniques. Whereas, primers OPP-7 and RAPD-4, RAPD were used. It can be claimed that mentioned methods are good means for identification and characterization of streptococci.
Streptococcus thermofilus jest jednym z najważniejszych przedstawicieli bakterii kwasu mlekowego. Pomimo powszechnego zastosowania tego gatunku w przemyśle mleczarskim nadal nieliczne są dane na temat jego zróżnicowania fenotypowego i genetycznego Streptococcus thermofilus. Szybka identyfikacja różnych gatunków bakterii kwasu mlekowego ma duże znaczenie dla kontroli jakości produktów mleczarskich. Niniejsza praca dotyczy charakterystyk i różnic występujących między różnymi liniami Streptococcus thermofilus. Badania zostały przeprowadzone przy użyciu technik PCR, RAPD i SDS-PAGE. Do badań użyto 15 linii Streptococcus thermofilus z Czeskiego Zbioru Mikroorganizmów Mleczarskich oraz jednej linii Streptococcus thermofilus z Czeskiego Zbioru Mikroorganizmów. Dokonano porównania primerów THI/THII między poszczególnymi liniami bakterii za pomocą techniki PCR. Następnie próbki były badane i identyfikowane przy użyciu technik RAPD i SDS-PAGE. Natomiast primery OPP-7 i RAPD-4 zbadano techniką RAPD. Badania wykazały, że zastosowane techniki mogą być skutecznie wykorzystywane do identyfikacji i charakterystyki bakterii z rodzaju Streptococcus.
Źródło:
Ecological Chemistry and Engineering. A; 2009, 16, 12; 1627-1635
1898-6188
2084-4530
Pojawia się w:
Ecological Chemistry and Engineering. A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bacteriotherapy for preventing recurrent upper respiratory infections in children: a real-world experience
Autorzy:
Tarantino, Vincenzo
Savaia, Valentina
D’Agostino, Roberto
Silvestri, Michela
Ciprandi, Giorgio
Powiązania:
https://bibliotekanauki.pl/articles/1398130.pdf
Data publikacji:
2018
Wydawca:
Index Copernicus International
Tematy:
recurrent upper respiratory infections
bacteriotherapy
Streptococcus salivarius 24SMB
Streptococcus oralis89a
nasal spray
children
Opis:
Background: Recurrent upper respiratory infections (RURI) constitute a social problem for both their pharmaco-economic impact and the burden for the family. Bacteriotherapy could be an interesting preventive option. Objective: The aim of this study was to evaluate the preventive effects of RURI in children. Design: The study was designed as spontaneous and was conducted in real-life setting. Globally, 80 children (40 males, mean age 5.26 (2.52) years) with RURI were enrolled. Children were treated with Streptococcus salivarius 24SMB and Streptococcus oralis 89a: nasal spray 2 puffs per nostril twice/day for a week for 3 monthly courses. Number of URI, and school and work absences were evaluated and compared with the past year. Results: Bacteriotherapy significantly halved the mean number of URI episodes being 5.98 (2.30) in the past year and 2.75 (2.43) after the treatment (p<0.0001). Bacteriotherapy also induced an over 35% reduction both in the number of school days and in the number of working days missed per month from 4.50 (2.81) to 2.80 (3.42) and from 2.33 (2.36) to 1.48 (2.16), respectively (p<0.0001). Conclusions: This real-life study provides the first evidence that Streptococcus salivarius 24SMB and Streptococcus oralis 89a nasal spray could be effective in preventing RURI in children.
Źródło:
Polish Journal of Otolaryngology; 2018, 72, 3; 33-38
0030-6657
2300-8423
Pojawia się w:
Polish Journal of Otolaryngology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on the possibility of treating streptococcal infections with hyperbaric oxygenation
Autorzy:
Wolański, Władysław
Powiązania:
https://bibliotekanauki.pl/articles/1375129.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Medycyny i Techniki Hiperbarycznej
Tematy:
streptococcus
mouse
general infection
local infection
hyperbaric therapy
Opis:
The aim of the study was to determine the effect of the application of hyperbaric oxygen therapy on the course of an infection with group A type T-3 hemolytic β streptococcus. Experiments were carried out on Porton white mice and in vitro blood plates. General and local infections with streptococci were induced in animals. The infected animals were treated with hyperbaric oxygenation. The lethal effect of infection was significantly inhibited using hyperbaric oxygenation on the first and second day following the infection.
Źródło:
Polish Hyperbaric Research; 2020, 1(70); 43-46
1734-7009
2084-0535
Pojawia się w:
Polish Hyperbaric Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A novel method of immunomodulation of endothelial cells using Streptococcus pyogenes and its lysate
Autorzy:
Arokiaraj, Mark Christopher
Wilson, Jarad
Powiązania:
https://bibliotekanauki.pl/articles/2038174.pdf
Data publikacji:
2021-06-30
Wydawca:
Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego
Tematy:
biomarkers
endothelial cells
immune-regulation
Streptococcus pyogenes
Opis:
Introduction. Coronary artery diseases and autoimmune disorders are common in clinical practice. Aim. In this study, Streptococcus pyogenes and its lysate were studied to modify the endothelial function. Material and methods. HUVEC cells were seeded in the cell culture, and Streptococcus pyogenes were added to the cell culture, and the supernatant was studied for the secreted proteins. In the second phase, the bacterial lysate was synthesized, and the lysate was added to cell culture and studied. Results. When S. pyogenes alone was added to culture, E Cadherin, Angiostatin, EpCAM and PDGF-AB were some of the biomarkers elevated significantly. HCC1, IGFBP2 and TIMP were some of the biomarkers which showed a reduction. When the lysate was added, the cell-culture was maintained for a longer time, and it showed the synthesis of immune regulatory cytokines. Heatmap analysis showed a significant number of proteins/cytokines concerning the immune/pathways, and toll-like receptors superfamily were modified. BLC, IL 17, BMP 7, PARC, Contactin2, IL 10 Rb, NAP 2 (CXCL 7), Eotaxin 2 were maximally increased. By principal component analysis, the results observed were significant. Conclusion. There is potential for a novel method of immunomodulation of the endothelial cells, which have pleiotropic functions, using S. pyogenes and its lysates.
Źródło:
European Journal of Clinical and Experimental Medicine; 2021, 2; 116-128
2544-2406
2544-1361
Pojawia się w:
European Journal of Clinical and Experimental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Antimicrobial resistance and molecular characteristics of Streptococcus agalactiae isolated from women of reproductive age
Lekooporność i molekularna charakterystyka Streptococcus agalactiae izolowanych od kobiet w wieku rozrodczym
Autorzy:
Musiorska, Magdalena
Kasprowicz, Andrzej
Białecka, Anna
Lenart-Boroń, Anna
Powiązania:
https://bibliotekanauki.pl/articles/1035486.pdf
Data publikacji:
2016
Wydawca:
Instytut Medycyny Wsi
Tematy:
"Streptococcus agalactiae"
"antimicrobial resistance"
"capsular types"
"multiplex PCR"
"pregnancy"
Opis:
Introduction. Streptococcus agalactiae infections are among the most significant causes of neonatal invasive diseases. Proper screening and detection of pregnant women carrying GBS allows intrapartum administration of antibiotic prophylaxis and is an effective measure in preventing transmission of bacteria from mother to newborns. Material and methods. Sixty three bacterial strains were isolated from vaginal swabs from pregnant and nonpregnant women of reproductive age. Species were identified by colony morphology, haemolysis type, Gram staining and SLIDEX® Strepto Plus latex test. Antimicrobial resistance of 56 strains was determined using disk-diffusion method. The presence of molecular resistance determinants was assessed using PCR with specific primers, and capsular types were identified using multiplex PCR. Results. None of the strains were resistant to the first drug of choice, penicillin. A large percentage of isolates (78.6%) were resistant to doxycycline. The prevalence of resistance to macrolides and lincosamides, antibiotics used in women allergic to penicillin, was high. Those results corresponded with PCR tests, as tetM and ermA1 were most frequently detected genes (98.4 and 87.3%, espectively). 7.94% of strains possessed 7 different out of 13 tested genes determining resistance to different groups of antimicrobials. Among the capsular types, Ia, which proved to be associated with the most severe and invasive infections in mothers and neonates, was the most prevalent (65.08%).
Wstęp. Infekcje wywołane przez Streptococcus agalactiae są jednymi z głównych przyczyn chorób inwazyjnych noworodków. Badania przesiewowe w kierunku nosicielstwa paciorkowców z grupy B (GBS) u ciężarnych umożliwiają zastosowanie śródporodowej profilaktyki antybiotykowej w celu zapobiegania przenoszeniu bakterii z matki na noworodka. Materiały i metody. Przebadano 63 szczepy bakterii uzyskane poprzez wymazy pochwowe od ciężarnych i nieciężarnych kobiet w wieku rozrodczym. Bakterie zidentyfikowano na podstawie morfologii kolonii, typu hemolizy, barwienia Grama i testu SLIDEX® Strepto Plus. Profil lekooporności 56 szczepów zbadano metodą dyfuzyjnokrążkową. Występowanie genów warunkujących lekooporność oznaczono techniką konwencjonalnego PCR, natomiast metoda multiplex PCR posłużyła do oznaczenia polisacharydów otoczkowych. Wyniki. Nie stwierdzono oporności na lek pierwszego wyboru, jakim jest penicylina. 78,6% izolatów było opornych na doksycyklinę. Często także stwierdzano oporność na makrolidy i linkozamidy, które są antybiotykami stosowanymi u pacjentek uczulonych na penicylinę. Wyniki te korespondowały z wynikami testów PCR, gdyż geny tetM i ermA1 były najczęściej stwierdzanymi genetycznymi determinantami lekooporności (odpowiednio u 98,4 i 87,3% szczepów). Aż 7,94% szczepów S. agalactiae posiadało 7 spośród 13 testowanych genów warunkujących oporność na różne antybiotyki. Test multiplex PCR wykazał, że najbardziej rozpowszechniony był typ Ia polisacharydów otoczkowych, powiązany z najcięższymi i najpoważniejszymi infekcjami. Został on wykryty u 65,08% szczepów. Wnioski. Pomimo całkowitej wrażliwości na penicylinę, wielooporność szczepów S. agalactiae izolowanych od kobiet w wieku rozrodczym jest powszechna. Oporność na antybiotyki u tych bakterii może być warunkowana przez występowanie więcej niż jeden gen w jednym izolacie.
Źródło:
Medycyna Środowiskowa - Environmental Medicine; 2016, 19, 4; 27-33
1505-7054
2084-6312
Pojawia się w:
Medycyna Środowiskowa - Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Streptococcus suis: a re-emerging pathogen associated with occupational exposure to pigs or pork products. Part I - epidemiology
Autorzy:
Dutkiewicz, Jacek
Sroka, Jacek
Zając, Violetta
Wasiński, Bernard
Cisak, Ewa
Sawczyn, Anna
Kloc, Anna
Wójcik-Fatla, Angelina
Powiązania:
https://bibliotekanauki.pl/articles/991187.pdf
Data publikacji:
2017
Wydawca:
Instytut Medycyny Wsi
Tematy:
streptococcus suis
pigs
humans
carriage
disease
epidemiology
treatment
prevention
Opis:
Streptococcus suis (ex Elliot 1966, Kilpper-Bälz & Schleifer 1987) is a facultatively anaerobic Gram-positive ovoid or coccal bacterium surrounded by a polysaccharide capsule. Based on the antigenic diversity of the capsule, S. suis strains are classified serologically into 35 serotypes. Streptococcus suis is a commensal of pigs, commonly colonizing their tonsils and nasal cavities, mostly in weaning piglets between 4–10 weeks of age. This species occurs also in cattle and other mammals, in birds and in humans. Some strains, mostly those belonging to serotype 2, are also pathogenic for pigs, as well as for other animals and humans. Meningitis is the primary disease syndrome caused by S. suis, both in pigs and in humans. It is estimated that meningitis accounted for 68.0% of all cases of human disease reported until the end of 2012, followed by septicaemia (including life-threatening condition described as ‘streptococcal toxic shock-like syndrome’ – STSLS), arthritis, endocarditis, and endophthalmitis. Hearing loss and/or vestibular dysfunction are the most common sequelae after recovery from meningitis caused by S. suis, occurring in more than 50% of patients. In the last two decades, the number of reported human cases due to S. suis has dramatically increased, mostly due to epidemics recorded in China in 1998 and 2005, and the fulminant increase in morbidity in the countries of south-eastern Asia, mostly Vietnam and Thailand. Out of 1,642 cases of S. suis infections identified between 2002–2013 worldwide in humans, 90.2% occurred in Asia, 8.5% in Europe and 1.3% in other parts of the globe. The human disease has mostly a zoonotic and occupational origin and occurs in pig breeders, abattoir workers, butchers and workers of meat processing facilities, veterinarians and meat inspectors. Bacteria are transmitted to workers by close contact with pigs or pig products, usually through contamination of minor cuts or abrasions on skin of hands and/or arms, or by pig bite. A different epidemiologic situation occurs in the Southeast Asian countries where most people become infected by habitual consumption of raw or undercooked pork, blood and offal products in the form of traditional dishes. Prevention of S. suis infections in pigs includes vaccination, improvement in pig-raising conditions, disinfection and/or fumigation of animal houses, and isolation of sick animals at the outbreak of disease. Prevention of human infections comprises: protection of skin from pig bite or injury with sharp tools by people occupationally exposed to pigs and pig products, prompt disinfection and dressing of wounds and abrasions at work, protection of the respiratory tract by wearing appropriate masks or repirators, consulting a doctor in the case of febrile illness after exposure to pigs or pork meat, avoidance of occupations associated with exposure to pigs and pork by immunocompomised people, avoidance of consumption of raw pork or pig blood, adequate cooking of pork, and health education.
Źródło:
Annals of Agricultural and Environmental Medicine; 2017, 24, 4
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ultrasound conditioning of Streptococcus thermophilus CNRZ 447: growth, biofilm formation, exopolysaccharide production, and cell membrane permeability
Autorzy:
Khadem, H.
Tirtouil, A.M.
Drabo, M.S.
Boubakeur, B.
Powiązania:
https://bibliotekanauki.pl/articles/2096999.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Streptococcus thermophilus
ultrasound conditioning
bacterial adhesion
biofilm
exopolysaccharides
Opis:
Sonication is one of the new and innovative approaches that is being increasingly used in food industry to control fermentation processes and to eradicate spoiling. Recently, this approach has seen new industrial applications such as enhancing microbial productivity. The present study aimed to assess the effects of ultrasound conditioning on the metabolism and extracellular matrix production of Streptococcus thermophilus. Bacterial suspensions were treated in ultrasonic bath (35 kHz, 240/60 W peak/nominal power, 1.8 l capacity) for different time periods (5, 10, 15, 20, 30, 45, and 65 min), and the growth improvement, adhesion ability, biofilm formation, and exopolysaccharide production of the bacterial strain were measured. The bacterial strain exhibited resistance to the treatment, and the conditioning improved the growth, adhesion, membrane permeability, biofilm formation, and exopolysaccharide production ability. An optimal treatment was obtained for 30 minutes of conditioning. An excellent yield of desirable exopolysaccharides (1788 mg glucose equivalent/l) was achieved. Ultrasound conditioning may be used as a potential approach to enhance certain biotechnological properties of industrial microorganisms.
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2020, 101, 2; 159-165
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The growing importance of Enterococcus and Streptococcus agalactiae in uncomplicated urinary tract infections
Autorzy:
Jermakow, Katarzyna
Pajączkowska, Magdalena
Krzyżanowska, Barbara
Nowicka, Joanna
Dworniczek, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/552572.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Przyjaciół Medycyny Rodzinnej i Lekarzy Rodzinnych
Tematy:
Streptococcus agalactiae
Enterococcus spp
uncomplicated urinary tract infection.
Źródło:
Family Medicine & Primary Care Review; 2016, 3; 250-252
1734-3402
Pojawia się w:
Family Medicine & Primary Care Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Properties of beta-galactosidase from cells of Streptococcus lactis 192 and Lactobacillus lactis F-16 strains
Właściwości beta-galaktozydazy z komórek szczepów Streptococcus lactis 192 i Lactobacillus lactis F-16
Autorzy:
Rymaszewski, J.
Cichosz, G.
Kujawski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1398371.pdf
Data publikacji:
1985
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
desintegration of cell thermal stability
lactose
influence of ions
Streptococcus lactts
Lactobacmus lactts
Opis:
The β-galactosidase synthetized by cells of Str. lactis 192 and Lbc. lactis F-16 in characterized on the basis of pH and temperature optimum for the enzyme's activity, thermal stability and the effect of selected ions. There were significant differences in β-galactosidase activity depending on the strain and on the kind of extract. The Str. lactis 192 enzyme demonstrated higher activity in lactose fermentation and lower thenmal stability than the β-galactosidase of Lbc. lactis F-16. The effect of ions on enzyme activity was diversified and depended on the time of activity, the kind of extract and the bacteria strain.
Podjęto próbę charakterystyki β-galaktozydazy syntetyzowanej przez komórki Str. lactis 192 i Lbc. lactis F-16 na podstawie wyznaczenia optimum pH i temperatury działania enzymv, stabilności termicznej i wpływu wybranych jonów. Stwierdzono istotne różnice w aktywności β-galaktozydazy pomiędzy badanymi szczepami, a także rodzajami ekstraktów. Optimum działania β-galaktozydazy zawartej w odpowiednich ekstraktach przypadało w warunkach: - ekstrakt wewnątrzkomórkowy Str. lactis 192: temp. 308 K (35°C) i 318-323 K (45-50°C), pH 7.0, - ekstrakt ściany komórkowej Str. lactis 192: temp. 308 K (35°C) i pH 5,0, - ekstrakt wewnątrzkomórkowy Lbc. lactis F-16: temp. 323 K (50°C) i pH 6,0, - ekstrakt ściany komórkowej Lbc. lactis F-16: temp. 313 K (40°C) i pH 7,0. Enzym Str. lactis 192 wykazał wyższą aktywność fermentacji laktozy oraz niższą stabilność termiczną niż β-galaktozydaza Lbc. lactis F-16. Wpływ jonów na aktywność enzymu był zróżnicowany i zależny od czasu działania, rodzaju ekstraktu i szczepu bakterii. Oceniono również wpływ przechowywania komórek bakterii Str. lactis 192 w stanie zamrożonym i liofilizowanym na aktywność β-galaktozydazy. Zaobserwowano większy spadek aktywności β-galaktozydazy w przypadku preparatów liofilizowanych. Fakt ten należy tłumaczyć tym, że liofilizacji poddano komórki uprzednio zdezintegrowane, a ponadto nie stosowano żadnych substancji ochronnych podczas zamrażania i suszenia sublimacyjnego.
Źródło:
Acta Alimentaria Polonica; 1985, 11, 4; 449-460
0137-1495
Pojawia się w:
Acta Alimentaria Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnolol inhibits Streptococcus suis-induced inflammation and ROS formation via TLR2/MAPK/NF-κB signaling in RAW264.7 cells
Autorzy:
Wang, J.
Sun, Y.
Zhang, L.
Xu, W.
You, J.
Lu, H.
Song, Y.
Wei, J.
Li, L.
Powiązania:
https://bibliotekanauki.pl/articles/2087779.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
magnolol
Streptococcus suis
Toll-like receptor2
mitogen-activated protein kinase
nuclear factor Kappa B
Źródło:
Polish Journal of Veterinary Sciences; 2018, 21, 1; 111-118
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Antimicrobial activity of some honey samples against pathogenic bacteria
Autorzy:
Mahendran, S.
Kumarasamy, D.
Powiązania:
https://bibliotekanauki.pl/articles/11684.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
antimicrobial activity
honey sample
pathogenic bacteria
honey
Staphylococcus aureus
Streptococcus pyogenes
Escherichia coli
Pseudomonas aeruginosa
Proteus mirabilis
Opis:
The aim of the present research work to investigate antimicrobial activity of some honey samples six winter honeys six summer honeys collected from different regions of Western Ghats. The microbes used in this study are Staphylococcus aureus, Streptococcus pyogenes, Escherichia coli, Pseudomonas aeruginosa, and Proteus mirabilis. Antibacterial activity of the honeys was assayed using the Disc diffusion method. Noticeable variations in the antibacterial activity of the different honey samples were observed. Among the microbes Staphylococcus aureus is the most sensitive against all honey samples shows the maximum inhibitor zone compare to summer honeys.
Źródło:
International Letters of Natural Sciences; 2015, 07
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
QS – systems communication of Gram-positive bacterial cells
Autorzy:
Ziemichód, Alicja
Skotarczak, Bogumiła
Powiązania:
https://bibliotekanauki.pl/articles/1386088.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
Tematy:
Quorum sensing
Gram-positive bacteria
signaling molecules
gene expression
competence of Streptococcus pneumoniae and Bacillus subtilis
virulence of Staphylococcus aureus
quorum sensing
bakterie Gram dodatnie
cząsteczki sygnałowe
ekspresja genów
kompetencja Streptococcus pneumoniae i Bacillus subtilis
wirulencja Staphylococcus aureus
Opis:
In Gram-positive bacteria, cell-to-cell communication, also called quorum sensing (QS) mainly is dependent on extracellular signaling oligopeptide pheromones, which stimulate a response either indirectly, by activating a two-component phosphorelay, or directly, by binding to cytoplasmic effectors. The oligopeptide pheromones production and secretion are initiated in response to specific environmental stimuli or stresses. These pheromones are biosynthesized through different pathways and some have unusual functional chemistry as a result of posttranslational modifications. In the cells of Bacillus subtilis and Streptococcus pneumoniae this system controls the acquisition of the state of competence, while in Staphylococcus aureus it regulates virulence. The review aims at giving an updated overview of these peptide-dependant communication pathways.
U bakterii Gram dodatnich komunikacja od komórki do komórki, zwana także guorum sensing (QS) jest przede wszystkim zależna od zewnątrzkomórkowych sygnałowych oligopeptydowych feromonów, które stymulują odpowiedź także pośrednio poprzez aktywowanie dwuskładnikowych fosforanów lub bezpośrednio przez wiązanie efektorów cytoplazmatycznych. Wytwarzanie i wydzielanie feromonów oligopeptydowych jest inicjowane w odpowiedzi na specyficzne czynniki środowiskowe lub stres. Feromony są syntetyzowane różnymi drogami a niektóre mają jeszcze dodatkową funkcję chemiczną jako wynik modyfikacji potranslacyjnej. W komórkach Bacillus subtilis i Streptococcus pneumoniae ten system kontroluje nabycie stanu kompetencji, natomiast u Staphylococcus aureus reguluje wirulencję. Celem pracy był przegląd aktualnych danych dotyczących peptydozależnych dróg komunikacji.
Źródło:
Acta Biologica; 2017, 24; 51-56
2450-8330
2353-3013
Pojawia się w:
Acta Biologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Streptococcus suis: a re-emerging pathogen associated with occupational exposure to pigs or pork products. Part II – pathogenesis
Autorzy:
Dutkiewicz, J.
Zając, V.
Sroka, J.
Wasiński, B.
Cisak, E.
Sawczyn, A.
Kloc, A.
Wojcik-Fatla, A.
Powiązania:
https://bibliotekanauki.pl/articles/2081593.pdf
Data publikacji:
2018
Wydawca:
Instytut Medycyny Wsi
Tematy:
Streptococcus suis
pathogenesis
infection stages
interaction with host cells and tissues
virulence factors
genomic
determinants of pathogenicity
biofilm formation
Opis:
Abstract Streptococcus suis is a re-emerging zoonotic pathogen that may cause severe disease, mostly meningitis, in pigs and in humans having occupational contact with pigs and pork, such as farmers, slaughterhose workers and butchers. The first stage of the pathogenic process, similar in pigs and humans, is adherence to and colonisation of mucosal and/or epithelial surface(s) of the host. The second stage is invasion into deeper tissue and extracellular translocation of bacterium in the bloodstream, either free in circulation or attached to the surface of monocytes. If S. suis present in blood fails to cause fatal septicaemia, it is able to progress into the third stage comprising penetration into host’s organs, mostly by crossing the blood-brain barrier and/or blood–cerebrospinal fluid barrier to gain access to the central nervous system (CNS) and cause meningitis. The fourth stage is inflammation that plays a key role in the pathogenesis of both systemic and CNS infections caused by S. suis. The pathogen may induce the overproduction of pro-inflammatory cytokines that cause septic shock and/or the recruitment and activation of different leukocyte populations, causing acute inflammation of the CNS. Streptococcus suis can also evoke – through activation of microglial cells, astrocytes and possibly other cell types – a fulminant inflammatory reaction of the brain which leads to intracranial complications, including brain oedema, increased intracranial pressure, cerebrovascular insults, and deafness, as a result of cochlear sepsis. In all stages of the pathogenic process, S. suis interacts with many types of immunocompetent host’s cells, such as polymorphonuclear leukocytes, mononuclear macrophages, lymphocytes, dendritic cells and microglia, using a range of versatile virulence factors for evasion of the innate and adaptive immune defence of the host, and for overcoming environmental stress. It is estimated that S. suis produces more than 100 different virulence factors that could be classified into 4 groups: surface components or secreted elements, enzymes, transcription factors or regulatory systems and transporter factors or secretion systems. A major virulence factor is capsular polysaccharide (CPS) that protects bacteria from phagocytosis. However, it hampers adhesion to and invasion of host’s cells, release of inflammatory cytokines and formation of the resistant biofilm which, in many cases, is vital for the persistence of bacteria. It has been demonstrated that the arising by mutation unencapsulated S. suis clones, which are more successful in penetration to and propagation within the host’s cells, may coexist in the organism of a single host together with those that are encapsulated. Both ‘complementary’ clones assist each other in the successful colonization of host’s tissues and persistence therein. S. suis has an open pan-genome characterized by a frequent gene transfer and a large diversity. Of the genetic determinants of S. suis pathogenicity, the most important are pathogenicity islands (PAI), in particular, a novel DNA segment of 89 kb length with evident pathogenic traits that has been designated as 89K PAI. It has been estimated that more than one-third of the S. suis virulence factors is associated with this PAI. It has been proved that the virulent S. suis strains possess smaller genomes, compared to avirulent ones, but more genes associated with virulence. Overall, the evolution of the species most probably aims towards increased pathogenicity, and hence the most significant task of the current research is an elaboration of a vaccine, efficient both for humans and pigs.
Źródło:
Annals of Agricultural and Environmental Medicine; 2018, 25, 1; 186-203
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 18

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