Thesis (M.S.D.)--Indiana University School of Dentistry, 2010. / Title from PDF t. p. (viewed July 28, 2010) Advisor(s): Mychel Vail, Chair of the Research Committee, Joseph Legan, B. Keith Moore, Kenneth Spolnik, Susan Zunt. Curriculum vitae. Includes abstract. Includes bibliographical references (leaves 93-109).

Thesis (Ph. D.)--Ohio State University, 2005. / Title from first page of PDF file. Includes bibliographical references (p. 115-120).

Thesis (MScEng)--Stellenbosch University, 2013. / ENGLISH ABSTRACT: The objective of this thesis is to develop a 9.2 GHz low phase noise oscillator with a cylindrical cavity resonator. A cylindrical metal cavity with air as dielectric was used as a resonator. To minimise the phase noise of the oscillator, the resonator must be designed to have a high Q-factor. A high Q-factor was obtained by designing the resonator to operate in the TE011 mode. A tuning screw was used to tune the resonant frequency without significantly affecting the Q-factor. The tuning screw also separates the resonant frequencies of the degenerate TE011 and TM111 modes. The signal is coupled to the resonator by means of rectangular apertures. The coupling was designed to minimise the phase noise of the oscillator. A dual mode waveguide filter was developed and inserted into the oscillator loop in order to prevent oscillation at unwanted frequencies. Due to the excellent phase noise performance of the oscillator, it was not possible to measure the phase noise directly with the available phase noise meter. A measurement setup using two similar oscillators tuned to oscillate at frequencies differing by about 60 MHz was implemented. The output signals were down-converted to the difference frequency where the phase noise could be measured accurately. The output signal of the oscillator was measured at different locations in the loop and clearly showed that the resonator can be used as a filter to minimise the phase noise. The performance of the oscillators met all expectations. Phase noise levels of -115 dBc/Hz and -146 dBc/Hz were obtained at offset frequencies of 10 and 100 kHz. / AFRIKAANSE OPSOMMING: Die doel van hierdie tesis is om ‘n 9.2 GHz lae faseruis ossillator met 'n silindriese holte resoneerder te ontwikkel. 'n Silindriese metaal golfleier holte met 'n lug diëlektrikum was gebruik as die resoneerder. Om die faseruis van die ossillator te minimeer moet die resoneerder ontwerp word om 'n hoë Q-faktor te hê. Om 'n hoë Q-faktor te behaal was die resoneerder ontwerp om in die TE011 orde te werk. Die resoneerder is toegerus met 'n verstelskroef wat die bedryfsfrekwensie verstel sonder om die belaste Q-faktor aansienlik te beïnvloed. Die verstelskroef skei ook die frekwensie van die degeneratiewe TE011 en TM111 ordes. Drywing word na die resoneerder gekoppel deur middel van reghoekige openinge. Die koppeling is ontwerp om die faseruis van die ossillator te minimeer. 'n Tweede orde dubbelmodes golfleier filter is ontwerp en in die ossillatorlus ingevoeg om ossillasie by ongewenste frekwensies te voorkom. Vanweë die baie lae faseruis van die ossillator was dit nie moontlik om die faseruis direk met die beskikbare faseruismeter te meet nie. 'n Meetopstelling met twee soorgelyke ossillators waarvan die frekwensies met ongeveer 60 MHz verskil is geïmplementeer. Die uittreeseine van die ossillators is afgemeng na die verskilfrekwensie waar die meetinstrument meer sensitief is en die faseruis akkuraat gemeet kan word. Die uittreesein van die ossillator is by verskillende punte gemeet en het duidelik getoon dat die resoneerder as filter gebruik kan word om die faseruis te minimeer. Die ossillators se werkverrigting het aan die verwagtinge voldoen. Faseruis vlakke van -115 dBc/Hz en -146 dBc/Hz by afsetfrekwensies van onderskeidelik 10 en 100 kHz is verkry.

Made available in DSpace on 2014-06-11T19:32:53Z (GMT). No. of bitstreams: 0 Previous issue date: 2009-11-24Bitstream added on 2014-06-13T21:05:09Z : No. of bitstreams: 1 brito_gnb_dr_sjc.pdf: 2623888 bytes, checksum: 9b38ae1778541597981089a1c5d9b974 (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) / Os Transtornos alimentares (TA) como Anorexia Nervosa (AN) e Bulimia Nervosa (BN) são acompanhados de inúmeras alterações sistêmicas e bucais relacionadas ao comprometimento do estado nutricional e às práticas compensatórias inadequadas para o controle do peso. O objetivo deste estudo foi avaliar diversidade microbiológica existente na cavidade bucal de pacientes com estes transtornos, por meio de técnicas de cultivo e utilizando métodos moleculares independentes de cultivo. Foram incluídos no estudo 32 pacientes anoréxicos e 27 bulímicos, pareados com 59 indivíduos controle. Amostras de enxágüe bucal foram semeadas para a avaliação da prevalência de leveduras do gênero Candida, estafilococos, enterococos, estreptococcos do grupo mutans (EGM), lactobacilos, enterobactérias/pseudomonas. Espécies de Candida, estafilococos, enterococos, enterobactérias/pseudomonas foram identificadas pelo sistema API. Amostras de biofilme supragengival foram coletadas e utilizadas somente nos procedimentos moleculares. As contagens de microrganismos nos grupos foram comparadas por ANOVA/Mann-Whitney (5%). Houve diferença estatisticamente significantes (p<0,05) para as contagem de leveduras do gênero Candida, estafilococos, enterococos, EGM e lactobacilos entre o grupo TA e controle, mas não houve diferenças significativas para a prevalência de enterobactérias/pseudomonas (p=0,312). Pequena diferença entre os grupos foi observada na diversidade de espécies dos microrganismos estudados pelo método de cultivo. Avaliação molecular foi realizada pela ribotipagem por seqüenciamento do 16S rRNA bacteriano e regiões D1/D2 do 28S rRNA. Foram avaliados cerca de 3000 clones do grupo TA e 1500 clones do controle. Sessenta e duas espécies ou filotipos de bactérias foram detectados... / Eating disorders such as nervous Anorexia and Bulimia Nervosa have several clinical and oral alterations related to the nutritional state involvement and the inadequate compensatory practices for weight control. The aim of this study was to evaluate the microbial diversity in the oral cavity of patients with Anorexia Nervosa and Bulimia nervosa by cultivation techniques and cultivationindependent molecular methods. The study included 32 patients and 27 bulimic anorexics, matched with 59 control subjects. Oral rinse samples were cultured to assess the prevalence of Candida species, staphylococci, enterococci, streptococci mutans (EGM), lactobacilli, Enterobacteriaceae / Pseudomonas. Candida species, staphylococci, enterococci, Enterobacteriaceae / Pseudomonas were identified by API systems. Supragingival biofilm samples were collected and used only in molecular procedures. Counts of microorganisms in the groups were compared by ANOVA / Mann-Whitney (5%). There was a statistically significant (p <0.05) for the counting of yeasts, staphylococci, enterococci, and lactobacilli EGM between TA and control groups, but there were no significant differences in the prevalence of Enterobacteriaceae / Pseudomonas (p = 0.312). Few differences between the groups were observed in the species diversity of organisms studied by the method of cultivation. Molecular analysis was performed by ribotyping by sequencing the 16S rRNA bacterial and D1/D2 regions of 28S rRNA. About 3000 clones of the TA group and 1500 clones of control were evaluated. Sixty-two species or filotypes of bacteria were detected, with 22 identifications were found only in the study group, only 6 in the control group and 34 in both groups. Microorganisms related to caries and periodontal diseases... (Complete abstract click electronic access below)

Made available in DSpace on 2014-06-11T19:32:55Z (GMT). No. of bitstreams: 0 Previous issue date: 2009-11-23Bitstream added on 2014-06-13T21:05:15Z : No. of bitstreams: 1 navas_eafa_dr_sjc.pdf: 459908 bytes, checksum: ff1249e87aef3abfe1f5c0c880a88231 (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Considerando-se que pacientes com Lúpus Eritematoso Sistêmico são submetidos a tratamento com corticosteróides e imunossupressores, podemos concluir que esta condição pode interferir na presença de microrganismos potencialmente oportunistas na cavidade bucal. Deste modo, o objetivo deste estudo foi avaliar a presença de leveduras do gênero Candida, estafilococos, enterobactérias e Pseudomonas spp. na cavidade bucal de pacientes com LES comparando os resultados com indivíduos controle. Desta forma, foram selecionados 40 pacientes com idades entre 19 e 53 anos com LES e que estavam em tratamento por no mínimo 60 dias. Para o grupo controle foram selecionados 40 indivíduos sistemicamente saudáveis com perfil semelhante (quanto à idade, gênero e condições bucais) aos pacientes do grupo em estudo. Não foram incluídos pacientes diabéticos, portadores de próteses bucais totais e outras doenças sistêmicas e que estavam sob terapia com medicamentos que pudessem interferir com as condições bucais. Foram realizados anamnese, exame clínico e coleta de enxágüe bucal de cada paciente. A amostra de enxágüe bucal foi semeada em meios de cultura específicos para cada microrganismo e após período de incubação foram realizadas contagens de unidades formadoras de colônia (UFC), obtendo-se o número de UFC/mL. A partir dos isolados obtidos, foram realizadas provas de identificação a fim de caracterizar as espécies dos gêneros em estudo. As contagens de microrganismos foram comparadas entre os grupos LES e controle por ANOVA, Mann Whitney (5%). Contagens de microrganismos em indivíduos sob tratamento com fármacos imunossupressores ou não e atividade positiva... / Considering that patients with systemic erithematous lupus are treated with corticoids and immunossuppresive drugs, this condition may interfere in the presence of potentially opportunistic microorganisms in the oral cavity. The aim of this study was to evaluate the presence of Candida spp. staphylococci, enterobacteria and Pseudomonas spp. in the oral cavity of patients with systemic erithematous lupus (LES) comparing the results with control individuals. Forty patients aged 19-53 years with LES and under therapy for at least 60 days were selected. For the control group, 40 healthy individuals paired to the test group in relation to age, gender and oral conditions were selected. Diabetic and other systemic diseases patients, denture users and individuals under therapy with drugs that affect the oral conditions were not included. Clinical examination, anamnesis and oral rinses sampling were performed. Oral rinse samples were plated on specific culture media and after the period of incubation the number of colony forming units were counted, and the value of cfu/ml was obtained. The isolates were identified in order to obtain the species. The counts of microorganisms were compared between LES and control groups by ANOVA, Mann Whitney (5%). Also, counts of microorganisms in patients under treatment with immunossupressive drugs of not and positive or negative activity of the disease (SLEDAI) were compared. No significant differences in the counts of microorganisms between the studied groups were observed (yeasts, p= 0.55; staphylococci, p=0.24; enterobacteria/Pseudomonas spp., p=0.26). No differences in the counts of microorganisms were observed related to the clinical parameters tested. Higher prevalence of Candida albicans and Staphylococcus epidermidis... (Complete abstract click electronic access below)

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Made available in DSpace on 2014-10-09T12:28:24Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T13:56:26Z (GMT). No. of bitstreams: 0 / Dissertacao (Mestrado Profissionalizante em Lasers em Odontologia) / IPEN/D-MPLO / Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP; Faculdade de Odontologia, Universidade de Sao Paulo, Sao Paulo

Made available in DSpace on 2014-10-09T12:28:27Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T13:56:26Z (GMT). No. of bitstreams: 0 / Dissertacao (Mestrado Profissionalizante em Lasers em Odontologia) / IPEN/D-MPLO / Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP; Faculdade de Odontologia, Universidade de Sao Paulo, Sao Paulo

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Made available in DSpace on 2014-10-09T12:28:51Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T13:57:05Z (GMT). No. of bitstreams: 1 16374.pdf: 618632 bytes, checksum: 99e6c25f834160ee6bcf169bfc0e3c6d (MD5) / Dissertacao (Mestrado Profissionalizante em Lasers em Odontologia) / IPEN/D-MPLO / Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP; Faculdade de Odontologia, Universidade de Sao Paulo, Sao Paulo