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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
191

ANÁLISE DA UTILIZAÇÃO ENDODÔNTICA DO GEL PRODUZIDO À BASE DO EXTRATO HIDROGLICÓLICO DO PERICARPO DE Punica granatum L. (ROMÃ) CONTRA Enterococcus faecalis: EFEITO ANTIMICROBIANO E TOXICIDADE / Analysis of endodontic use of the gel based on hydroglycolic pericarp extract of Punica granatum L. (pomegranate) against Enterococcus faecalis: antimicrobial effect an toxicity

Schreiner, Fabiane 12 August 2016 (has links)
Made available in DSpace on 2017-07-24T19:22:03Z (GMT). No. of bitstreams: 1 FABIANE SCHREINER.pdf: 1371612 bytes, checksum: 4c92bfc09a7b2ad93f1107f9b7633f68 (MD5) Previous issue date: 2016-08-12 / Due to endodontic treatment failure, virulence and increase of antibiotic resistant microorganisms bacterial infections had a greater incidence. Plant extracts are promising resources in the control of biofilms and can be considered a new way to prevent and / or treat infections. Among these natural products, there is the Punica granatum L. (pomegranate),which features bioactive compounds such as flavonoids and phenols. Objective: To analyze, in vitro and ex vivo, the antibacterial effect of auxiliary substances based on Punica granatum L. (pomegranate) against Enterococcus faecalis. Method: After developed the hydroglycolic peel extract of Punica granatum L. , agar diffusion tests, determination of minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) and analysis of toxicity (lethality in microcrustacean - Artemia salina were performed. With this data gel with hydroglicolic extract of P. granatum pericarp (0.5 g/mL) were developed and tested in agar diffusion, as auxiliary substance of endodontic instrumentation and as intracanal medication in infected dentin with E. faecalis by counting colony forming units per milliliter (cfu/mL) in three experimental times. Results: The MIC was 0.5 g/ml and P. granatum gel at this concentration showed 8 mm inhibition zones against E. faecalis. The P. granatum gel reduced 96% in cfu/mL after instrumentation (p = 0.005), with evidence of effectiveness for use as an intracanal medication (p = 0.047), reducing contamination by 65%. The brine shrimp mortality rate was 42%, with an LC50 of 62.7 mg/ml, being a sligthy toxic extract. Conclusion: The pomegranate gel 0.5 g/ml was effective against E. faecalis and represents promising proposal in Endodontics. / Devido ao insucesso do tratamento endodôntico, da virulência e do aumento dos microorganismos resistentes a antibióticos houve uma maior incidência de infecções bacterianas. Os extratos de plantas são recursos promissores no controle de biofilmes, podendo ser considerados uma nova forma de prevenir e/ou tratar infecções. Dentre esses produtos de origem natural, destaca-se a Punica granatum L. (romã), que apresenta compostos fitoativos como os flavonóides e os fenóis. Objetivo: Analisar, in vitro e ex vivo, a ação antibacteriana de substância auxiliar e medicação intracanal à base do extrato hidroglicólico do pericarpo de Punica granatum L. (romã) veiculado em gel, contra Enterococcus faecalis. Método: Após desenvolvido o extrato hidroglicólico do pericarpo de P. granatum, foram realizados testes de difusão em ágar, determinação de concentração inibitória mínima (CIM) e concentração bactericida mínima (CBM) e análise da toxicidade (letalidade em microcrustáceo - Artemia salina). Com estes dados foi desenvolvido gel com extrato hidroglicólico do pericarpo de P. granatum (0,5 g/mL), que foi testado por difusão em ágar e como substância auxiliar da instrumentação endodôntica e medicação intracanal, para a verificação da ação antimicrobiana em dentina infectada com E. faecalis, pela contagem de unidades formadoras de colônia por mililitro (ufc/mL) em três tempos experimentais. Resultados: A CIM foi de 0,5 g/mL e o gel de P. granatum nesta concentração apresentou halos de inibição de 8 mm, sobre E. faecalis.O gel de P. granatum reduziu em 96% a contagem de ufc/mL após instrumentação (p=0,005),com indício de efetividade para uso como medicação intracanal (p=0,047), reduzindo a contaminação em 65%. A taxa de mortalidade em microcrustáceos foi de 42%, com LC50 de 62,7 mg/mL, sendo o extrato levemente tóxico. Conclusão: O gel de P. granatum a 0,5 g/mL foi efetivo sobre E. faecalis, representando proposta promissora em Endodontia.
192

Characterization of putative extended-spectrum β-lactamases (ESBL) producing Escherichia coli isolated from feedlot cattle in Southern Alberta

Lussier, Pamela, University of Lethbridge. Faculty of Arts and Science January 2010 (has links)
This thesis describes the detection, and characterization of putative extended-spectrum β-lactamases (ESBLs) producing Escherichia coli isolated from feedlot cattle in southern Alberta. Cattle either received no antimicrobials or were administered subtherapeutic antimicrobials in feed. In total, 7,184 E. coli isolates were collected, and screened for resistance to either ceftazidime (2μg mL-1 ) or cefpodoxime (2μg mL-1), and from these results 237 E. coli isolates were considered presumptive ESBL producers. Antimicrobial resistant bacteria were isolated throughout the experiment; however, ESBL-producing E. coli were not prevalent throughout the study. In total, only three isolates (B221B1, C152C1, C98A1) exhibited the ESBL phenotype. Molecular subtyping of these isolates revealed no clonality between these strains. Molecular characterization of the 237 isolates investigated in this study revealed blaTEM to be the most prevalent AMR determinant among the ampicillin-resistant isolates with resistance to ceftazidime (2μg mL-1 ) or cefpodoxime (2μg mL-1). These data suggest that ESBLs are not frequent among Canadian feedlot cattle and MDR resistance (55 of 237) was observed but is not prominent among both the subgroup and total isolates collected. It was determined that isolate B221B1 was ESBL-producing, and harboured the blaTEM-1 gene. The genes responsible for ESBL production in isolates C98A1 and C152C1 were not characterized. In order to characterize the antimicrobial resistance (AMR) genes coding for ESBL-production in these 2 isolates, cloning and conjugation experiments were attempted. However, I was unable to resolve the mechanism responsible for ESBL phenotype in these two isolates. The results of this study imply that the development of ESBL-producing E. coli is complex, and is probably affected by both the administration of antimicrobials and numerous other presently undefined environmental factors. / xii, 104 leaves : ill. ; 28 cm
193

Micropropagation of tulbaghia species.

Ngunge, Viwe Nomzamo Precious. January 2011 (has links)
Tulbaghia (Alliaceae) is a genus of plants with medicinal, ornamental and nutritive value. Different plant parts such as roots, bulbs, leaves and flowers are used in the treatment of a variety of conditions. The bulbs of Tulbaghia violacea are used as a remedy for pulmonary tuberculosis as well as an anthelmintic. Due to the extensive harvesting of plants in this genus, the genus is susceptible to overexploitation and may eventually become threatened with extinction. It was therefore the aim of this study to systematically examine the micropropagation of Tulbaghia ludwigiana and Tulbaghia violacea, as well as to evaluate the antimicrobial and phytochemical properties of micropropagated plants. Seeds of T. ludwigiana and T. violacea were successfully decontaminated using 70% ethanol, 1% Benlate and 3.5% NaOCl. Temperature played a significant role in the germination of both species while light did not play a significant role in this process. Light did not play a significant role in the stomatal density of T. violacea seedlings. Hypocotyls were the regenerative part of the seedlings in both species. A low number of shoots was yielded by the combination of various concentrations of NAA and mTR in the growth medium in both species. There were more isoprenoid cytokinins than there were aromatic cytokinins in each of the seedling sections of T. violacea that were analysed, with tZ being the predominant isoprenoid cytokinin, while BA was the predominant aromatic cytokinin. Shoots of both species were successfully rooted in a medium with IBA, while some shoots had simultaneously rooted during shoot multiplication. Potting soil and vermiculite were used in the acclimatization of both species, where T. violacea plantlets acclimatized successfully. This was not the case for T. ludwigiana. Micropropagated T. violacea plantlets contained higher concentrations of phytochemical compounds and displayed better antibacterial activity than outdoor-grown plants. / Thesis (M.Sc.)-University of KwaZulu-Natal, Pietermaritzburg, 2011.
194

Aspects of antimicrobial activity of terpenoids and the relationship to their molecular structure /

Griffin, Shane. January 2000 (has links)
Thesis (Ph.D.)--University of Western Sydney, Hawkesbury, 2000. / "A thesis submitted in fulfillment of the requirements for the degree of Doctor of Philosophy-Science". Bibliography : p. 191-233.
195

Antimicrobial metabolites from Australian Acacia : thesis /

Ali, Marina. January 1998 (has links)
Thesis (PhD) -- University of Western Sydney, Nepean, 1998. / Bibliography : p. 164-171.
196

Study of antimicrobial activity and mechanism of zinc oxide nanoparticles against foodborne pathogens

Liu, Yang, Li, Men`gshi. January 2009 (has links)
The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file. Title from PDF of title page (University of Missouri--Columbia, viewed on March 23, 2010). Thesis advisor: Dr. Mengshi Lin. Includes bibliographical references.
197

Atividade antimicrobiana, anti-inflamatória, citotoxicidade e genotoxicidade do extrato glicólico de Betula pendula Roth (Bétula) / Antimicrobial and anti-inflammatory activities, cytotoxicity and genotoxicity of glycolic extract of Betula pendula Roth (Betula)

Jesus, Daiane de [UNESP] 26 February 2016 (has links)
Submitted by DAIANE DE JESUS null (daianej1@gmail.com) on 2016-04-15T16:50:31Z No. of bitstreams: 1 dissertação_mestrado_Daiane_de_Jesus.pdf: 3279422 bytes, checksum: 26d41d44824eab136d1bda47cf50107f (MD5) / Approved for entry into archive by Ana Paula Grisoto (grisotoana@reitoria.unesp.br) on 2016-04-18T13:14:19Z (GMT) No. of bitstreams: 1 jesus_d_me_sjc.pdf: 3279422 bytes, checksum: 26d41d44824eab136d1bda47cf50107f (MD5) / Made available in DSpace on 2016-04-18T13:14:19Z (GMT). No. of bitstreams: 1 jesus_d_me_sjc.pdf: 3279422 bytes, checksum: 26d41d44824eab136d1bda47cf50107f (MD5) Previous issue date: 2016-02-26 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Visando o potencial terapêutico do extrato glicólico de B. pendula em tratamentos de infecções bacterianas e fúngicas e de doenças inflamatórias, foram avaliadas suas atividades antimicrobiana, anti-inflamatória, citotóxica e genotóxica. A atividade antimicrobiana do extrato foi analisada em Candida albicans, C. dubliniensis, C. glabrata, C. guilliermondii, C. krusei, C. tropicalis, Staphylococcus aureus, Streptococcus mutans, Escherichia coli e Pseudomonas aeruginosa com a determinação das Concentrações Inibitória Mínima e Microbicida Mínima (CIM e CMM) em culturas planctônicas e posteriormente testado sobre biofilmes monotípicos. A atividade citotóxica foi avaliada em cultura de macrófagos de camundongo (RAW 264.7) e fibroblastos gengivais humanos (FMM-1) após exposição de 5 min e 24 h ao extrato, com o teste MTT e teste imunoenzimático (ELISA) que quantificou a produção das citocinas IL-1β e TNF-α produzidas por RAW 264.7. A genotoxicidade do extrato foi avaliada pelo teste de micronúcleos. A atividade anti-inflamatória foi avaliada nos sobrenadantes coletados de culturas de RAW 264.7 estimuladas com LPS de E. coli e expostas aos extratos (5 min e 24 h) pela quantificação de citocinas IL-1β, TNF-α e IL-10 por ELISA e óxido nítrico (ON) pelo método de Griess. A análise estatística foi realizada por ANOVA e teste de Tukey, com significância de 5%. O extrato teve ação antimicrobiana em todos biofilmes, com redução acima de 39,5% em 5 min e acima de 78% em 24 h. A viabilidade celular foi satisfatória em concentrações abaixo de 50 mg/mL em 5 min tanto para FMM-1, quanto para RAW 264.7, contudo em 24 h concentrações acima de 3,13 e 12,5 mg/mL foram citotóxicas para RAW 264.7 e FMM-1, respectivamente. Não houve indícios de ação genotóxica do extrato. A atividade anti-inflamatória foi evidenciada pela redução significativa na produção de TNF-α e ON nos grupos tratados. Conclui-se que o extrato de bétula tem potencial como agente antimicrobiano e anti-inflamatório. / In order to verify the therapeutic potential of glicolic extract of B. pendula on the threatment of bacterial and fungical infection and on inflammatory diseases, its antimicrobial, anti-inflammatory actions, cytotoxic and genotoxic effects were evaluated. The antimicrobial activity of the extracts was tested on Candida albicans, C. dubliniensis, C. glabrata, C. guilliermondii, C. krusei, C. tropicalis, Staphylococcus aureus, Streptococcus mutans, Escherichia coli and Pseudomonas aeruginosa with determination of Minimum Inhibitory and Minimum Microbicide Concentrations (MIC and MMC) in planktonic growth, following of test in monotypic biofilms. The cytotoxic activity was evaluated in mouse macrophages (RAW 264.7) and human gingival fibroblast (FMM-1) after exposure of 5 min and 24 h to extract, through the MTT test and by Enzyme Linked Immunosorbent Assay (ELISA) to quantify the production of the cytokines IL-1β and TNF-α by RAW 264.7. The genotoxicity of the extracts was evaluated by micronucleus test. The anti-inflammatory activity was evaluated in RAW 264.7 stimulated with LPS from E. coli, after the period of exposure to the extract (5 min and 24 h) the supernatant was removed to quantify pro-inflammatory (IL-1β and TNF-α.) and anti-inflammatory (IL-10) cytokines by ELISA and nitric oxide (NO) by Griess method. Statistical analysis was performed by ANOVA and Tukey's test, with significance level of 5%. The extract has shown antimicrobial activity with reduction above of 39.5% of biofilm in 5 min and more than 78% in 24 h. The cell viability was satisfactory at concentrations below 50 mg/mL in 5 min to RAW 264.7 and FMM-1, however in 24 h concentrations above 3.13 and 12.5 mg/mL were cytotoxic to RAW 264.7 and FMM-1, respectively. There was no evidence of genotoxic action of the extract. The anti-inflammatory activity was evidenced by the significant reduction in the production of TNF-α and NO in the treated groups. It concludes that the birch extract has potential as antimicrobial and anti-inflammatory agent.
198

Efeito da incorporação de agentes antifúngicos na resistência à tração e porosidade de materiais resilientes temporários para base de próteses / Effect of incorporation of antifungal agents on the ultimate tensile strength and porosity of temporary soft denture liners

Jozely Francisca Mello Lima 10 February 2017 (has links)
Este estudo investigou a resistência à tração (ou limite de resistência à tração- LRT) e a porosidade de reembasadores resilientes temporários modificados por concentrações inibitórias mínimas (CIMs) de agentes antifúngicos para o biofilme Candida albicans (SC5314). Para os testes de LRT, corpos de prova em forma de halteres (n=7) com uma área transversal de 33 mm x 6 mm x 3 mm foram produzidos para os materiais resilientes (Trusoft e Softone) sem (controle) ou com incorporação de cinco fármacos em suas CIMs: nistatina- 0,032 g; diacetato de clorexidina- 0,064; cetoconazol- 0,128 g; miconazol- 0,256 g; itraconazol-0,256 g (grama de fármaco por grama de pó de material resiliente). Após a plastificação, as amostras foram imersas em água destilada a 37°C durante 24 h, 7 e 14 dias e, então, testadas em tensão em uma máquina universal de ensaios (EMIC DL-500 MF) a 40 mm/min. A porosidade foi mensurada por absorção de água, com base na exclusão do efeito plastificante. Inicialmente, determinou-se por isotermas de sorção, que a solução de armazenagem adequada para os corpos de prova (65 mm x 10 mm x 3,3 mm) de ambos os materiais foi o cloreto de cálcio anidro a 50% (S50). Assim, o fator de porosidade (FP) foi calculado para os grupos de estudo (n=10) formados por espécimes sem (controle) ou com incorporação de fármaco em suas CIMs (nistatina, clorexidina ou cetoconazol) após a armazenagem em água destilada ou S50 por 24 h, 7 e 14 dias. Os dados de resistência à tração (MPa) e percentagem de alongamento (%) foram submetidos à ANOVA de 3 fatores seguida pelo teste de Tukey (=0,05). Os dados de porosidade foram analisados estatisticamente por ANOVA de medidas repetidas para 4 fatores e teste de Tukey (=0,05). Ao final de 14 dias, a resistência à tração para ambos os materiais foi significativamente menor nos grupos modificados pelo miconazol e itraconazol em relação aos outros grupos (P<0,0001), que não mostraram diferenças significativas entre si (P>0,05). Após 7 e 14 dias em água, o miconazol e itraconazol adicionados a ambos os materiais resultaram em percentagens significativamente menores de alongamento em comparação com os outros fármacos e ao controle (P<0,0001), que foram semelhantes entre si (P>0,05). O cetoconazol não resultou em alterações significativas no FP para ambos os materiais resilientes em água ao longo de 14 dias (P>0,05). Em comparação aos controles, houve aumento dos FPs do Softone e Trusoft aos 14 dias de imersão em água somente após a adição de nistatina e clorexidina e de clorexidina, respectivamente (P<0,05). Ambos os materiais não apresentaram alterações significativas no FP em até 14 dias de imersão na S50, em comparação aos controles (P>0,05). Em todas as condições experimentais, os FPs do Softone e Trusoft foram significativamente menores quando imersos em S50 em comparação com a água destilada (P<0,05). Concluiu-se que a adição de nistatina, clorexidina e cetoconazol nas CIMs para o biofilme de C. albicans não resultou em efeitos deletérios na resistência à tração e na percentagem de alongamento dos materiais resilientes temporários para base de prótese até o período de 14 dias. A adição de antifúngicos nas CIMs não resultou em efeitos adversos à porosidade de ambos os materiais resilientes temporários em diferentes períodos de imersão em água, com exceção da clorexidina e nistatina no Softone e clorexidina no Trusoft aos 14 dias. Não foram observados efeitos deletérios para a porosidade de ambos os materiais resilientes modificados com as CIMs dos fármacos durante os 14 dias de imersão na S50. / This study investigated the tensile strength (ultimate tensile strength- UTS) and porosity of temporary soft denture liners modified by minimum inhibitory concentrations (MICs) of antifungal agents for Candida albicans biofilm (SC5314). For UTS tests, dumbbell-shaped specimens (n=7) with a central cross-sectional area of 33 mm x 6 mm x 3 mm were produced by resilient materials (Trusoft and Softone) without (control) or with incorporation of five drugs at MICs: nystatin- 0.032 g; chlorhexidine diacetate-0.064 g; ketoconazole- 0.128 g; miconazole- 0.256 g; itraconazole- 0.256 g (each per gram of soft liner powder). After plasticization, specimens were immersed in distilled water at 37°C for 24 h, 7 and 14 days, and then tested in tension in a universal testing machine (EMIC DL-500 MF) at 40 mm/min. The porosity was measured by water absorption, based on exclusion of the plasticizer effect. Initially, it was determined by sorption isotherms that the adequate storage solution for specimens (65 mm x 10 mm x 3.3 mm) of both materials was 50% anhydrous calcium chloride (S50). Then, the porosity factor (PF) was calculated for the study groups (n=10) formed by specimens without (control) or with drug incorporation at MICs (nystatin, chlorhexidine or ketoconazole) after storage in distilled water or S50 for 24 h, 7 and 14 days. Data of tensile strength (MPa) and elongation percentage (%) were submitted to 3-way ANOVA followed by Tukey\'s test (=0.05). Data of porosity were statistically analyzed by 4-way repeated measures ANOVA and Tukeys test (=0.05). At the end of 14 days, the tensile strength for both materials was significantly lower in the groups modified by miconazole and itraconazole compared to the other groups (P<0.0001), which showed no significant difference between them (P>0.05). After 7 and 14 days in water, miconazole and itraconazole added into both materials result in significant lower elongation percentages compared to the other drugs and control (P<.0001), which were similar to each other (P>0.05). Ketoconazole resulted in no significant changes in PF for both liners in water over 14 days (P>0.05). Compared to the controls, Softone and Trusoft PFs were increased at 14-day water immersion only after addition of nystatin and chlorhexidine, and chlorhexidine, respectively (P<0.05). Both materials showed no significant changes in PF in up to 14 days of S50 immersion, compared to the controls (P>0.05). In all experimental conditions, Softone and Trusoft PFs were significantly lower when immersed in S50 compared to distilled water (P<0.05). It was concluded that the addition of the nystatin, chlorhexidine and ketoconazole at MICs for C. albicans biofilm resulted in no harmful effects on the ultimate tensile strength and elongation percentage of the temporary soft denture liners up to 14-day period. The addition of antifungals at MICs resulted in no detrimental effects for the porosity of both temporary soft liners in different periods of water immersion, except for chlorhexidine and nystatin in Softone and chlorhexidine in Trusoft at 14 days. No deleterious effect was observed for the porosity of both soft liners modified by the drugs at MICs over 14 days of S50 immersion.
199

Genes associados à virulência e multirresistência de antimicrobianos em linhagens Trueperella Pyogenes isoladas de mastite e outras afecções em animais domésticos / Genes associated to virulence and multidrug resistance in strains of Trueperella pyogenes isolated from bovine mastitis and other diseases of domestic animals

Risseti, Rafaela Mastrangelo [UNESP] 28 April 2015 (has links) (PDF)
Made available in DSpace on 2016-06-07T17:12:13Z (GMT). No. of bitstreams: 0 Previous issue date: 2015-04-28. Added 1 bitstream(s) on 2016-06-07T17:16:47Z : No. of bitstreams: 1 000858080_20160630.pdf: 190100 bytes, checksum: 47dd9e01e892e41f2f90965bdb032201 (MD5) Bitstreams deleted on 2016-07-01T13:02:23Z: 000858080_20160630.pdf,. Added 1 bitstream(s) on 2016-07-01T13:03:19Z : No. of bitstreams: 1 000858080.pdf: 604042 bytes, checksum: 52a63eb5887518214744f20b5b57d70e (MD5) / Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) / Trueperella pyogenes são bactérias oportunistas caracterizadas por infecções piogênicas em animais, em geral refratárias aos tratamentos com antimicrobianos convencionais. Recentemente, os genes que codificam a exotoxina piolisina (plo), e fatores relacionados à adesão de T. pyogenes às células do animal susceptível, como fímbrias (fimA, fimC, fimE, fimG), neuraminidases (nanH, nanP), e proteína ligada ao colágeno (cbpA) têm sido associados a virulência do patógeno. O presente estudo investigou a ocorrência de multirresistência dos isolados aos antimicrobianos e a presença dos genes plo, fimA, fimC, fimE, fimG, nanH, nanP e cbpA em 41 linhagens de T. pyogenes isoladas de diferentes afecções em bovinos, caprinos, ovinos, equino e cão. T. pyogenes foi identificado predominantemente em casos de mastite (46,3%), abscessos (19,5%), pneumonia (9,8%), metritie (9,8%), linfadenite (7,3%), seguidos em menor frequência por encefalite (4,9%) e orquite (2,4%). A maior sensibilidade dos isolados foi observada para florfenicol (97,6%), azitromicina (97,6%), tetraciclina (95,2%), ceftiofur (92,7%), penicilina (92,7%), ampicilina (92,7%), gentamicina (90,3%) e eritromicina (87,8%). Em contraste, alta frequência de resistência dos isolados foi observada para bacitracina (46,3%), neomicina (31,7%), lincomicina (31,7%) e sulfametoxazole/trimetoprim (24,3%). O índice de resistência múltipla aos antimicrobianos - IRMA (>0,3) foi encontrado em 13 (31.7%) isolados, particularmente nos casos de mastite bovina. Dentre os isolados multirresistentes a três ou mais grupos de antimicrobianos, 12 (92,3%) foram identificados na espécie bovina, notadamente em infecções mamárias. Os genes mais frequentes detectados nos isolados foram: plo (40/41=97,6%), fimA (36/41=87,9%), nanP (34/41=82,9%), fimE (32/41=78,0%), nanH (28/41=62,3%), fimC (23/41=56,0%) e cbpA (5/41=12,2%). As principais associações de genes nos isolados foram observadas entre... / Trueperella pyogenes are opportunistic bacterium characterized by suppurative infections in domestic animals, commonly refractory to conventional therapy. Recently, genes which encode exotoxin pyolysin (plo), and factors that promote adhesion of T. pyogenes to host cells, such as fimbriae (fimA, fimC, fimE, fimG), neuraminidases (nanH, nanP), and collagen-binding protein (cbpA) have been associated to virulence of pathogen. The aim of present study was investigate occurrence of multi-drug resistance of isolates, as well the presence of genes plo, fimA, fimC, fimE, fimG, nanH, nanP, and cbpA in 41 T. pyogenes strains obtaned from bovine, goats, sheep, horses, and dog isolated among different clinical manifestations. T. pyogenes was identified predominantly in mastitis (46.3%), abscesses (19.5%), pneumonia (9.8%), metritis (9.8%), lymphadenitis (7.3%), followed by encephalitis (4.9%) and orchitis (2.4%). The strains showed major in vitro sensitivity to florfenicol (97.6%), azithromicin (97.6%), tetracycline (95.2%), ceftiofur (92.7%), penicillin (92.7%), ampicillin (92.7%), gentamicin (90.3%), and erythromycin (87.8%). In contrast, highest frequency of resistance among isolates was observed to bacitracin (46.3%), neomycin (31.7%), lincomycin (31.7%), and trimethropim/sulfamethoxazole (24.3%). Antimicrobial multiple resistance index - AMRI (>0.3) was found in 13 (31.7%) isolates, particularly in bovine mastitis cases. Among multi-drug resistant isolates to 3 or more group of antimicrobials, 12 (92.3%) were identified in bovine, predominantly in mammary infections. The most common genes detected among isolates were: plo (40/41=97.6%), fimA (36/41=87.9%), nanP (34/41=82.9%), fimE (32/41=78.0%), nanH (28/41=62.3%), fimC (23/41=56.0%), and cbpA (5/41=12.2%). The major associations between genes of isolates were plo, fimA, fimE, nanH, and nanP (10/41=24.4%), and plo, fimA, fimE, fimC, nanH, and nanP (8/41=19.5%), mainly in bovine mastitis. To ...
200

Ação bactericida (in vitro) de gerador de alta frequência sobre culturas bacterianas comumente encontradas em feridas crônicas

Bampi, Gabriela Manosso 23 January 2015 (has links)
Na prática fisioterapêutica utilizam-se diversas técnicas de eletroterapia com finalidades antissépticas e bactericidas. Porém, poucos estudos são encontrados sobre a ação de gerador de alta frequência no tratamento de enfermidades causadoras de contaminação/infecção, como feridas crônicas. Contudo, geradores de alta frequência são conhecido por seu efeito bactericida e antisséptico, graças à produção de ozônio na superfície onde é aplicado. Tendo em vista que o gerador de alta frequência apresenta baixo custo, fácil manuseio e ação potencializadora do processo cicatricial, por meio da sua ação bactericida, a presente dissertação teve como objetivo avaliar o efeito antimicrobiano de gerador de alta frequência sobre as bactérias Staphylococcus aureus, Pseudomonas aeruginosa e Acinetobacter baumannii. Realizou-se testes de tamanho de halo de inibição; contagem de unidades formadoras de colônia, citometria de fluxo usando o kit Live/Dead® para verificar integridade da membrana e rodamina 123 para avaliar o estresse oxidativo e avaliação da temperatura. Conclui-se que o gerador de alta frequência apresenta ação bactericida, sendo, que o tempo e a frequência comportam-se de forma dependente, sua ação é dose-dependente e age de forma mais expressiva em bactérias Gram-negativas, Sua utilização não causa aumento da temperatura local, apenas no eletrodo de vidro e a produção de radicais livres aumenta com o tempo de exposição ao gerador de alta frequência (833Hz), enquanto a viabilidade celular decresce. / Submitted by Ana Guimarães Pereira (agpereir@ucs.br) on 2016-12-09T17:12:27Z No. of bitstreams: 1 Dissertacao Gabriela Manosso Bampi.pdf: 1053473 bytes, checksum: 47b9df5694f5409de46618b2d0f7c98b (MD5) / Made available in DSpace on 2016-12-09T17:12:27Z (GMT). No. of bitstreams: 1 Dissertacao Gabriela Manosso Bampi.pdf: 1053473 bytes, checksum: 47b9df5694f5409de46618b2d0f7c98b (MD5) Previous issue date: 2016-12-09 / Conselho Nacional de Desenvolvimento Científico e Tecnológico / In the physiotherapy practices, various electrotherapy techniques are used with antiseptic and antibacterial purposes; however, few studies are found about the action of high-frequency generator in the treatment of diseases causing contamination/infection, such as chronic wounds; nevertheless, the high-frequency generator is known for its antiseptic and bactericidal effect by producing ozone at the surface where it is applied. Considering that the high-frequency generator is inexpensive, easy handling and potentiating action of the healing process through their bactericidal action, this thesis aims to evaluate the antimicrobial effect of highfrequency generator on bacteria of the genus Staphylococcus aureus, Pseudomonas aeruginosa and Acinetobacter baumannii. To analyzed the action of highfrequency generator the following tests are realizes: inhibition zone size; counting colony forming units, flow cytometry using the kit Live / Dead® to verify membrane integrity and rhodamine 123 to assess oxidative stress and temperature evaluation. Concluding that the high-frequency generator has bactericidal action, time and frequency behave as dependents, revealing its action is dose-dependent and acts more significantly in Gram-negative bacteria. Its use does not cause local temperature increase, only the glass electrode and the free radical production increases with time of exposure to the high-frequency generator (833Hz), while cell viability decreased.

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