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DOLOČEVANJE MEJE DETEKCIJE IZBRANIH MIKROORGANIZMOV NA RAZLIČNIH POVRŠINAH V BOLNIŠNIČNEM OKOLJU Z METODO PCR
Patricija Murko, 2015, magistrsko delo

Opis: Izhodišča: V magistrski nalogi smo določevali mejo detekcije izbranim mikroorganizmom na različnih površinah v bolnišničnem okolju. Prenos s človeka na človeka je najbolj pogost, saj je v bolnišničnem okolju veliko pacientov, prav tako pa tudi zdravstvenega osebja. Različne površine v bolnišničnem okolju lahko tudi pripomorejo k razširitvi mikroorganizmov. Dokazano je, da so mikroorganizmi sposobni preživeti na površinah tudi do nekaj tednov. Metodologija: V raziskavi smo vzorčili predhodno kontaminirane kovinske, steklene in plastične površine in jemali brise le-teh po 24-urnem sušenju. Izbrani mikroorganizmi so bili: E. faecium, S. aureus, B. subtilis, E. coli, K. pneumoniae, P. aeruginosa in C. albicans. Iz brisov smo eluirali mikroorganizme s fiziološko raztopino. Iz eluata smo najprej določili koncentracijo mikroorganizmov s klasično mikrobiološko metodo z nanosom na selektivne medije. Z metodo PCR smo nato določili še prisotnost DNK izbranih mikroorganizmov. Za statistično analizo smo uporabili programsko orodje IBM SPSS 20. Z neparametričnima testoma smo ugotavljali statistično pomembne razlike. Rezultati: Z molekularno metodo smo rezultat dobili v nekaj urah, s klasično inkubacijsko metodo je trajalo 2–3 dni. Ko smo primerjali preživetje izbranih mikroorganizmov pri različnih koncentracijah na kovinski in stekleni površini, nismo opazili statistično značilnih razlik, saj je bil p ≥ 0,05. Ko pa smo zajeli še plastično površino, so se razlike pokazale pri po Gramu pozitivnima bakterijama E. faecium in S. aureus ter po Gramu negativnima bakterijama E. coli in P. aeruginosa, saj je bil p ≤ 0,05. Sklep: Klasična gojitvena metoda je dolgotrajna, medtem ko se metoda PCR lahko uporablja za hitro oceno čistoče površin, saj smo v nekaj urah prišli do rezultatov.
Ključne besede: bolnišnične okužbe, detekcija, površine, PCR, Enterococcus faecium, Staphylococcus aureus, Bacillus subtilis, Escherichia coli, Klebsiella pneumoniae, Pseudomonas aeruginosa, Candida albicans.
Objavljeno: 15.06.2015; Ogledov: 543; Prenosov: 83
.pdf Polno besedilo (2,41 MB)

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Exploring ComQXPA quorum-sensing diversity and biocontrol potential of Bacillus spp. isolates from tomato rhizoplane
Anna Oslizlo, Polonca Štefanič, Sabina Vatovec, Sara Beigot Glaser, Maja Rupnik, Ines Mandić-Mulec, 2015, izvirni znanstveni članek

Opis: Bacillus subtilis is a widespread and diverse bacterium t exhibits a remarkable intraspecific diversity of the ComQXPA quorum-sensing (QS) system. This manifests in the existence of distinct communication groups (pherotypes) that can efficiently communicate within a group, but not between groups. Similar QS diversity was also found in other bacterial species, and its ecological and evolutionary meaning is still being explored. Here we further address the ComQXPA QS diversity among isolates from the tomato rhizoplane, a natural habitat of B. subtilis, where these bacteria likely exist in their vegetative form. Because this QS system regulates production of anti-pathogenic and biofilm-inducing substances such as surfactins, knowledge on cell–cell communication of this bacterium within rhizoplane is also important from the biocontrol perspective. We confirm the presence of pherotype diversity within B. subtilis strains isolated from a rhizoplane of a single plant. We also show that B. subtilis rhizoplane isolates show a remarkable diversity of surfactin production and potential plant growth promoting traits. Finally, we discover that effects of surfactin deletion on biofilm formation can be strain specific and unexpected in the light of current knowledge on its role it this process.
Ključne besede: Bacillus subtilis, quorum sensing, cellular communication, rhizosphere
Objavljeno: 04.08.2017; Ogledov: 56; Prenosov: 1
.pdf Polno besedilo (944,16 KB)

4.
Microorganisms with claimed probiotic properties: an overview of recent literature
Sabina Fijan, 2014, pregledni znanstveni članek

Opis: Probiotics are defined as live microorganisms, which when administered in adequate amounts, confer a health benefit on the host. Health benefits have mainly been demonstrated for specific probiotic strains of the following genera: Lactobacillus, Bifidobacterium, Saccharomyces, Enterococcus, Streptococcus, Pediococcus, Leuconostoc, Bacillus, Escherichia coli. The human microbiota is getting a lot of attention today and research has already demonstrated that alteration of this microbiota may have far-reaching consequences. One of the possible routes for correcting dysbiosis is by consuming probiotics. The credibility of specific health claims of probiotics and their safety must be established through science-based clinical studies. This overview summarizes the most commonly used probiotic microorganisms and their demonstrated health claims. As probiotic properties have been shown to be strain specific, accurate identification of particular strains is also very important. On the other hand, it is also demonstrated that the use of various probiotics for immunocompromised patients or patients with a leaky gut has also yielded infections, sepsis, fungemia, bacteraemia. Although the vast majority of probiotics that are used today are generally regarded as safe and beneficial for healthy individuals, caution in selecting and monitoring of probiotics for patients is needed and complete consideration of risk-benefit ratio before prescribing is recommended.
Ključne besede: Lactic-acid bacteria, Lactobacillus, Bifidobacterium, Saccharomyces, Enterococcus, Streptococcus, Pediococcus, Leuconostoc, Bacillus, Escherichia coli
Objavljeno: 21.06.2017; Ogledov: 40; Prenosov: 0
.pdf Polno besedilo (267,98 KB)

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