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Nyberg, Lindborg Kristina. "Phagolysosomal pH measurements in alveolar macrophages /". Stockholm, 2000. http://diss.kib.ki.se/2000/91-628-4512-8/.
Pełny tekst źródłaKoort, Eve. "Uncertainty estimation of potentiometrically measured pH and pK[subscript a] values /". Online version, 2006. http://dspace.utlib.ee/dspace/bitstream/10062/599/5/koorteve.pdf.
Pełny tekst źródłaHuang, Ming-Chieh. "Silicon microfabricated device for non-sheath-flow cytometer-based chemical analysis and microchannel flow sensing /". Thesis, Connect to this title online; UW restricted, 1999. http://hdl.handle.net/1773/5870.
Pełny tekst źródłaCORDARO, RICHARD BRIAN. "ELECTRON IMPACT DISSOCIATIVE IONIZATION OF HYDROGEN, WATER, AND HYDROGEN SULFIDE". Diss., The University of Arizona, 1985. http://hdl.handle.net/10150/188028.
Pełny tekst źródłaMo, Fong-ming. "The role of intracellular pH in the control of adenosine output from oxidative skeletal muscle in-vivo and in-vitro /". Hong Kong : University of Hong Kong, 1996. http://sunzi.lib.hku.hk/hkuto/record.jsp?B17310696.
Pełny tekst źródłaCHO, HYUCK. "COINCIDENCE DETECTION OF PROTONS AND METASTABLE HYDROGEN ATOMS FROM DISSOCIATIVE IONIZATION OF MOLECULAR HYDROGEN BY ELECTRON IMPACT (TIME-OF-FLIGHT)". Diss., The University of Arizona, 1985. http://hdl.handle.net/10150/188027.
Pełny tekst źródłaCASTLE, KENNETH ROBERT. "ABSOLUTE RADIOMETRIC CALIBRATION OF A SPECTROPOLARIMETER". Diss., The University of Arizona, 1985. http://hdl.handle.net/10150/188026.
Pełny tekst źródła巫放明 i Fong-ming Mo. "The role of intracellular pH in the control of adenosine output from oxidative skeletal muscle in-vivo and in-vitro". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1996. http://hub.hku.hk/bib/B31235190.
Pełny tekst źródłaWang, Guo-Ji 1953. "Effect of pH on the structure and function of La Crosse virus". Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277186.
Pełny tekst źródłaMeng, Yiyu. "Nitrite oxidising bacteria in soil : examination of the interactions with ammonia oxidisers and the influence of pH on their diversity and distribution". Thesis, University of Aberdeen, 2016. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=231853.
Pełny tekst źródłaBischoff, Timothy William. "Ammonium production by Bipolaris maydis race T on L-asparagine and its relationship to pH /". The Ohio State University, 1986. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487265555440415.
Pełny tekst źródłaWilcox, Jeffrey Kendall. "Influence of pH on zinc adsorption by kaolinite, montmorillonite, and Londonderry clay". Thesis, The University of Sydney, 1994. https://hdl.handle.net/2123/26746.
Pełny tekst źródłaMcMillan, Duncan George Glenn, i n/a. "Proton and iron capture mechanisms of Bacillus sp. strain TA2.A1 at alkaline pH values". University of Otago. Department of Microbiology & Immunology, 2008. http://adt.otago.ac.nz./public/adt-NZDU20081104.090840.
Pełny tekst źródłaBarman, Dipti Narayan. "pH sensitive fluorescent sensors". Diss., Columbia, Mo. : University of Missouri-Columbia, 2007. http://hdl.handle.net/10355/4972.
Pełny tekst źródłaThe entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on April 3, 2009) Includes bibliographical references.
Page, Ray Dean. "Characterization of H+ Excretion in a Model Renal Epithelium". Thesis, University of North Texas, 1991. https://digital.library.unt.edu/ark:/67531/metadc332842/.
Pełny tekst źródłaYe, Xuemin. "The effect of water pH on swimming performance, blood pH, red cell pH, ion concentrations and catecholamine concentrations in plasma, and gill potential in rainbow trout (Salmo gairdneri)". Thesis, University of British Columbia, 1986. http://hdl.handle.net/2429/26676.
Pełny tekst źródłaScience, Faculty of
Zoology, Department of
Graduate
Vinnakota, Kalyan Chakravarthy. "pH dynamics, glycogenolysis and phosphoenergetics in isolated cell free reconstituted systems and in mouse skeletal muscle /". Thesis, Connect to this title online; UW restricted, 2006. http://hdl.handle.net/1773/8034.
Pełny tekst źródłaHeyes, Colin D. "Effects of pH, cations and lipids on the structure, stability and function of bacteriorhodopsin". Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/30754.
Pełny tekst źródłaShorrock, Susan M. "The exploration of tissue pH and its relationship to bacterial contamination". Link to electronic version, 2000. http://www.wpi.edu/Pubs/ETD/Available/etd-0426100-172003/.
Pełny tekst źródłaVasconcellos, Andréa Araújo de 1986. "Evaluation of extracellular matrix and structure of Candida albicans biofilms developed at different pH conditions = Avaliação da matriz extracelular e da estrutura de biofilmes de Candida albicans desenvolvidos em diferentes condições de pH". [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/290230.
Pełny tekst źródłaTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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Resumo: A colonização da prótese dental por Candida albicans pode contribuir para o desenvolvimento de candidose associada ao seu uso. As variações de pH que ocorrem no biofilme formado sobre a prótese dental podem influenciar a quantidade de matriz extracelular e a estrutura do biofilme de C. albicans. Entretanto, não está claro como o pH pode interferir na matriz extracelular e em determinados parâmetros estruturais nos biofilmes de C. albicans. O objetivo neste estudo foi avaliar a influência do pH na quantidade de matriz extracelular e na estrutura de biofilmes de C. albicans. Discos de resina à base de poli (metilmetacrilato) com a rugosidade de superfície padronizada foram utilizados como substrato para a formação dos biofilmes. Os discos foram cobertos por uma película de saliva e biofilmes de C. albicans ATCC 90028 foram desenvolvidos em meio de cultura RPMI 1640 tamponado em diferentes valores de pH (4,0, 5,5 e 7,0) por 48 horas como grupos experimentais, e meio de cultura sem o tamponamento (pH inicial de 7,4) como grupo controle. O número de células viáveis foi quantificado por diluição seriada, e a quantidade de matriz de polissacarídeos foi analisada pelo método fenol-sulfúrico (n = 9). As características morfológicas dos biofilmes foram observadas por meio de microscopia eletrônica de varredura e por microscopia confocal (n = 3). Os resultados foram submetidos à análise de variância com um fator, seguido pelo teste de Tukey, com nível de significância de 5%. Observou-se aumento significativo no número de células viáveis nos biofilmes desenvolvidos em pH 4,0 e 5,5 (p < 0,001). A quantidade de polissacarídeos foi maior em pH 5,5, seguida por biofilmes desenvolvidos em pH 4,0 (p < 0,05). As imagens obtidas por microscopia eletrônica de varredura e por microscopia confocal mostram maior formação de hifas pelos biofilmes quando desenvolvidos em pH 7,0 e no grupo controle. Pode ser concluído que condições de pH ácidos influenciaram a formação de biofilmes com o maior número de células viáveis e, consequentemente, maior quantidade de matriz extracelular. Além disso, o pH afetou consideravelmente a morfologia dos biofilmes de C. albicans
Abstract: The colonization of dental prosthesis by Candida albicans may contribute to the development of Candida-associated denture stomatitis. The pH changes that occur in the biofilm developed over the dental prosthesis may influence the amount of extracellular matrix and the structure of C. albicans biofilms. However, it is not clear how the pH could interfere in the extracellular matrix and specifically structural parameters of C. albicans biofilms. The object of this study was to evaluate the influence of environmental pH on the amount of extracellular matrix and structure in C. albicans biofilms. Poly (methylmethacrylate) resin discs with surface roughness standardized were used as substrate for biofilm formation. The discs were covered by the salivary pellicle, and C. albicans ATCC 90028 biofilms were developed in RPMI 1640 culture medium buffered at different pH values (4.0, 5.5 and 7.0) for 48 hours as experimental groups, and unbuffered culture medium (initial pH of 7.4) as control. The number of viable cells was quantified by serial dilution, and the amount of polysaccharide matrix was analyzed by phenol sulfuric method (n = 9). The morphological characteristics of biofilms were observed by scanning electron microscopy (SEM) and confocal laser scanning microscopy (CLSM) (n = 3). Data were analyzed by one-way ANOVA, followed by Tukey's test, with significance set at 5%. It was observed a significant increase in the number of viable cells in biofilms developed at pH 4.0 and 5.5 (p < 0.001). The amount of polysaccharides was higher at pH 5.5, followed by biofilms developed at pH 4.0 (p < 0.05). The images obtained by SEM and CLSM showed higher hyphae formation by biofilms developed at pH 7.0 and in the control group. It can be concluded that acidic pH conditions influenced the formation of C. albicans biofilms, with higher viable cells and, consequently, higher amount of extracellular matrix. Furthermore, the pH significantly affected the morphology of C. albicans biofilms
Doutorado
Protese Dental
Doutora em Clínica Odontológica
Roulston, Dallas Peter. "An investigation of optical methods for the mapping of microgradients of hydrogen-ion concentration within dental biofilms". Thesis, University College London (University of London), 2017. http://discovery.ucl.ac.uk/1565417/.
Pełny tekst źródłaKoumanov, Assen. "Theoretical prediction of ionisation properties of proteins /". Stockholm, 2003. http://diss.kib.ki.se/2003/91-7349-535-2.
Pełny tekst źródłaRuddock, Nancy T. "Intracellular pH changes during and following porcine oocyte activation /". free to MU campus, to others for purchase, 2000. http://wwwlib.umi.com/cr/mo/fullcit?p9974681.
Pełny tekst źródłaCorreia, Marília Ferreira. "Potencial anticárie dos reservatórios de cálcio, fosfato e fluoreto do biofilme dental". [s.n.], 2018. http://repositorio.unicamp.br/jspui/handle/REPOSIP/289273.
Pełny tekst źródłaDissertação (mestrado) - Universidade Estadual de Campinas. Faculdade de Odontologia de Piracicaba
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Resumo: O biofilme dental apresenta reservatórios orgânicos e inorgânicos de cálcio (Ca), fosfato (Pi) e fluoreto (F) que se liberados para o fluido do biofilme mediante quedas de pH, interfeririam com o grau de saturação do fluido, reduzindo a desmineralização dental. Entretanto, ainda se desconhece a origem responsável pelas mudanças observadas na concentração de Ca, Pi e F no fluido após queda de pH: se derivadas dos reservatórios ou da desmineralização do próprio substrato dental. Em acréscimo, ainda não se determinou a solubilidade desses reservatórios em pHs considerados importantes para interferir com o processo de desmineralização dental. Assim, este trabalho de dissertação teve como objetivos avaliar a influência que a solubilidade dos substratos e dos reservatórios do biofilme exercem na concentração inorgânica do fluido do biofilme, avaliando a cinética dos íons Ca, Pi e F para o fluido após desafio acidogênico. Para isto foram realizados dois estudos in situ, ambos cegos e cruzados. No primeiro foi contemplada a hipótese de que a concentração inorgânica do fluido do biofilme seria influenciada pela desmineralização do substrato, refletindo o grau de solubilidade do mineral que o compõe. Para isto, blocos de esmalte (menos solúvel), dentina (mais solúvel) e acrílico (não solúvel) foram expostos, durante 4 dias, a desafios cariogênicos utilizando glicose a 20%, 8x/ao dia; as variáveis analisadas ao final de cada fase foram composição microbiológica, pH no fluido, Ca, Pi e F no fluido e no estroma (parte sólida) do biofilme antes e 5 min após desafio acidogênico. A influência da quantidade dos reservatórios na concentração inorgânica do fluido foi avaliada no segundo in situ, onde em acréscimo, determinou-se a solubilidade dos mesmos em função de pHs decrescentes. Assim, biofilme dental foi formado, durante 14 dias, sobre blocos de esmalte e acrílico, utilizando diferentes freqüências de exposição a glicose a 20% (0, 2 e 8x/dia), para obtenção de biofilmes com diferentes quantidades de reservatórios. O pH, Ca, Pi e F foram determinados no fluido antes e 5 min após desafio acidogênico, enquanto a solubilidade dos reservatórios foi determinada através da extração de Ca, Pi e F no estroma do biofilme, utilizando tampões com pHs decrescentes (6,5; 5,5; 4,5 e ácido forte). Os resultados desses estudos permitiram observar que houve um aumento significativo de Ca no fluido após queda de pH, ocorrendo de modo semelhante independentemente do substrato onde o biofilme foi formado e da quantidade de reservatórios presentes no seu estroma. Além disso, a solubilidade dos reservatórios demonstrou ser função inversa do pH e direta da concentração de Ca e PI presente. Assim, sugere-se que os reservatórios representam uma importante fonte de mobilização iônica para o fluido do biofilme, porém o fluido não refletiu, na condição analisada, a diferença de solubilidade dos substratos utilizados e dos reservatórios presentes.
Abstract: Dental biofilm presents organic and inorganic reservoirs of calcium (Ca), phosphate (PI) and fluoride (F) that could act as a source of these ions to biofilm fluid during pH drops, reducing dental demineralization. It's still unknown the source responsible for the increase of such ions in biofilm fluid after pH drop, since they could be also derived from mineral dissolution of dental structure. In addiction, there's no clear evidence about the solubility of these reservoirs according to the pHs considered important to interfere with dental demineralization. Thus, this study aimed to evaluate the influence of mineral dissolution of dental structure and also of biofilm reservoirs in the inorganic composition of biofilm fluid, analyzing the kinetics of Ca, PI and F to fluid just after pH drop. Two crossover and blind in situ studies were performed, which the aim of the first one was to evaluate the hypothesis of the inorganic composition of biofilm fluid after pH drop would reflect the mineral solubility of substrate where biofilm was formed. Thus, dental biofilm was formed during 4 days on enamel (less soluble), dentine (more soluble) and acrylic (not soluble) slabs, which were exposed to 8 times/day to 20% glucose solution. In the end of each phase, the acidogenicity, microbiological composition and inorganic concentration of these biofilms were analyzed. The second in situ study evaluated the relation between the amount of Ca, Pi and F reservoirs with the inorganic composition of biofilm fluid and moreover, the potential of these reservoirs to release Ca, Pi and F was estimated according to decreasing pHs (6.5; 5.5; 4.5 and acid). Therefore during 14 days, dental biofilm was formed on enamel and acrylic slabs, which were exposed to different frequencies of 20% glucose (0, 2 and 8 times/day) to form biofilms with different amounts of Ca, Pi and F reservoirs. The biofilm fluid analyses were the same performed in the first study, however the concentration of Ca, Pi and F in biofilm solids were determined after extraction with buffers of 6.5, 5.5 and 4.5 and with acid. A significant increase in Ca concentration was observed after pH fell; nevertheless this increase was the same regardless of the substrate where biofilm was formed and regardless of the amount of Ca, Pi and F reservoirs. Furthermore, biofilm reservoirs showed potential to release Ca, Pi and F at those pHs analyzed, although their solubility were inversely related with the frequency of glucose exposure that biofilm was formed. These findings suggest that biofilm reservoirs are important source of Ca, Pi and F to biofilm fluid after pH drop, however the inorganic concentration of fluid does not reflect the mineral solubility of substrates, the amount and solubility potential of biofilm reservoirs.
Mestrado
Cariologia
Mestre em Odontologia
Wright, Patricia Anne. "Ammonia stores and excretion in fish : relationship to pH". Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/27654.
Pełny tekst źródłaScience, Faculty of
Zoology, Department of
Graduate
Wilson, Christopher Brant. "Measurement of chemical composition and pH profiles near the liquid-vapor interface of aqueous solutions using a unique confocal microscope system /". Thesis, Connect to this title online; UW restricted, 2007. http://hdl.handle.net/1773/9840.
Pełny tekst źródła卓文森 i Man-sum Cheuk. "Effects of sodium pyrophosphate and pH on the kinetics of iron releasefrom the N- and C-terminal binding sites of ovotransferrin". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1988. http://hub.hku.hk/bib/B31208551.
Pełny tekst źródłaNeves, Cynthia Der Torossian Torres. "Influência do ph da água de beber na gênese da alteração óssea por cádmio: estudo experimental em ratos". Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/23/23139/tde-17062015-111756/.
Pełny tekst źródłaThe cadmium (Cd) is a heavy metal, one of the most abundant elements found in the environment. There are evidences of its relationship in osteopenia, osteoporosis e osteomalacia and fragility of the bone tissue. This study aims to evaluatethe effect of the pH of the drinking water in the bonealteration origin caused by cadmium intoxication. This study envolved90 wistar rats (Ratus Norvegicus albinus), adults, males,divided in 6groups, were witch one receved: A -cadmium choride solution (400mg/L)withneutral ph (pH 7,0); B -cadmium choride solution(400mg/L) with acid ph (pH 5,0); C -cadmium choride solution(400mg/L)with basic ph(pH 8,0); D -with acid ph (pH 5,0); E -basic ph (pH 8,0); F -neutral pH (pH 7,0).Left femurs from each rat were evaluatedbybone density,DEXA,biomechanictest,HU scale from computerized tomography. The results shows that bone density became lower in the groups that received cadmium. In that wich received no cadmium with pH 5 ocurred an lower level of bone mineral density (BMO) andbone mineral content (BMC).The bone rigidity proved increased in the pH 5 with no cadmium. As a general conclusion, cadmium reduced the bone density.
Cheuk, Man-sum. "Effects of sodium pyrophosphate and pH on the kinetics of iron release from the N- and C-terminal binding sites of ovotransferrin /". Hong Kong : University of Hong Kong, 1988. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12434838.
Pełny tekst źródłaChintala, Rajesh. "Lime induced changes in the surface and soil solution chemistry of variable charge soils". Morgantown, W. Va. : [West Virginia University Libraries], 2008. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=5552.
Pełny tekst źródłaTitle from document title page. Document formatted into pages; contains ix, 128 p. : ill. (some col.). Includes abstract. Includes bibliographical references.
Gebhard, Susanne, i n/a. "The Phn and Pst systems of Mycobacterium smegmatis : phosphate transport and gene regulation". University of Otago. Department of Microbiology & Immunology, 2006. http://adt.otago.ac.nz./public/adt-NZDU20070502.112113.
Pełny tekst źródłaFrasseto, Fernanda. "Relação entre a atividade da isoenzima anidrase carbônica VI, o fluxo salivar e o PH do biofilme dental pré-escolares com cárie na infância". [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/288106.
Pełny tekst źródłaDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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Resumo: Este estudo teve como objetivos determinar a atividade da anidrase carbônica VI (ACVI) na saliva de pré-escolares com cárie e investigar a relação entre a experiência cárie (dmfs) e a atividade da ACVI, o fluxo salivar e pH do biofilme antes e após o bochecho com sacarose a 20% em pré-escolares. Trinta pré-escolares com idade entre 45,3 e 80,3 meses foram divididos em 2 grupos: grupo livres de cárie (LC) e grupo com cárie (C). Exames clínicos foram realizados por um examinador de acordo com os critérios da OMS + lesões iniciais de cárie. Em cada individuo, foi determinada a atividade da ACVI, o fluxo salivar e o pH do biofilme dental tanto antes quanto após o bochecho com sacarose. Os resultados foram submetidos aos testes de Wilcoxon, Mann-Whitney e correlação de Spearman (?=0,05). Os resultados mostraram que a atividade da ACVI antes do bochecho e a variação da atividade da ACVI foram maiores na saliva do grupo com cárie que do livres de cárie. Não houve diferença significativa entre os dois grupos após o bochecho. Porém, após o bochecho, a variação do pH do biofilme foi menor em ambos os grupos (p=0,0012 e p=0,0037 para C e LC, respectivamente). E, após o bochecho, houve um aumento significativo do fluxo salivar nos dois grupos (p=0,0003 e p=0,0037 para C e LC, respectivamente). Houve uma correlação negativa da variação entre a atividade da ACVI e a cárie (r=-0,501 e p=0,005). E uma correlação positiva entre a idade das crianças e a experiência de cárie (r=0,456 e p=0,011). Assim, os resultados sugerem que a variação da atividade da ACVI e a idade das crianças está associada com a cárie dentária em pré-escolares
Abstract: This study aimed to determine the activity of the carbonic anhydrase isoenzyme VI (CAVI) in saliva of preschool children with caries and investigate the relationship between caries and the salivary CAVI activity, salivary flow rate (SFR) and biofilm pH before and after a 20% sucrose mouthrinse in preschool children with caries. Thirty preschool children aging from 45.3 to 80.3 months were divided into two groups: caries-free group (CF) and caries group (C). Clinical examinations were conducted by one examiner (kappa=0.95) according to WHO criteria (dmfs) + early caries lesions. From each subject, CAVI activity, SFR and plaque pH were determined before and after a sucrose rinse. The results were submitted to Wilcoxon and Spearman correlation tests (?=0.05). The results showed that the pre-rinse CAVI activity and its variation were higher in saliva from caries children than from CF children. No difference was found between the two groups in the post- rinse salivary CAVI activity. After mouthrinse, the biofilm pH difference were lower in both groups (p=0.0012 and p=0.0037 for the C and CF group respectively). Also, after the sucrose rinse, SFR significantly increased in C and CF groups, (p=0.0003 and p=0.0037). The variation of salivary CA VI activity was negatively correlated with caries (r= -0.501 p=0.005). Child's age showed a positive correlation with caries (r=0.456 and p=0.011). These results suggest that variation of salivary CA VI activity and child's age are associated with dental caries of preschool children
Mestrado
Odontopediatria
Mestre em Odontologia
Duerr, Jeffrey Mark. "An analysis of the pH tolerance and substrate preference of isolated skeletal muscle mitochondria from Bufo marinus and Rana catesbeiana". PDXScholar, 1991. https://pdxscholar.library.pdx.edu/open_access_etds/4201.
Pełny tekst źródłaMendes, Gustavo Adolfo Martins. "Influência do pH de géis clareadores e do tempo de aplicação em esmalte pré dessensibilizado na topografia e cor dental". Universidade Federal de Goiás, 2016. http://repositorio.bc.ufg.br/tede/handle/tede/7798.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES
Tooth bleaching is one of the procedures with the greatest increase in demand, and the number of products and publications in recent years. However, regardless of the technique to be used bleaching, bleaching agents can cause various changes in tooth structure. Some whitening agents have a pH drop over its response action, which can cause changes in the mineral content of the enamel. These changes may be higher when the time of contact between the bleaching agent and the tooth surface is increased. The aim of this study was to investigate the influence of time of application of whitening gel and its effects on tooth structure in pre-desensitized enamel samples with arginine bicarbonate. Eighty enamel blocks (5.5 x 5.5 mm) were obtained from 40 third molar teeth. These were randomly divided into 16 experimental groups (n = 5). Samples were pre-desensitized with arginine bicarbonate (Colgate Pro-Relief) and then bleached as experimental groups, varying the method of application of whitening gels (Opalescence Boost - Ultradent; Total Blanc - DFL) versus time. The pH range of the gel over the application time, the color variation obtained and roughness of the sample surface were evaluated. Results were subjected to statistical analysis with a significance level of 5%, showed similarity between the gels as the bleaching efficiency and roughness standards and longer application times tend to generate higher roughness values. It was concluded that shorter times of application of the whitening gel are more efficient since they cause less damage to enamel and are able to lighten equally and that the use of desensitizing toothpaste Arginine bicarbonate base prior to bleaching does not affect the whitening effect.
O clareamento dental é um dos procedimentos com o maior aumento de procura, além do número de produtos e publicações nos últimos anos. No entanto, independentemente da técnica clareadora a ser utilizada, os agentes clareadores podem provocar várias alterações na estrutura dental. Alguns agentes de clareamento tem uma queda do pH ao longo da sua reação de ação, o que pode provocar alterações no conteúdo mineral do esmalte. Estas mudanças podem ser mais elevadas quando o tempo de contato entre o agente clareador e a superfície do dente é aumentado. O objetivo desse trabalho foi verificar a influência do tempo de aplicação do gel clareador e seus efeitos sobre a estrutura dental em amostras de esmalte pré-dessensibilizados com Bicarbonato de Arginina. Oitenta blocos de esmalte dental (5,5 x 5,5 mm) foram obtidos a partir de 40 dentes terceiros molares. Estes foram divididos aleatoriamente em 16 grupos experimentais (n=5). As amostras foram pré-dessensibilizadas com Bicarbonato de Arginina (Colgate Pró-Alívio) e em seguida clareadas conforme os grupos experimentais, variando o método de aplicação de géis clareadores (Opalescence Boost – Ultradent; Total Blanc – DFL) em função do tempo. A variação de pH do gel ao longo dos tempos de aplicação, a variação de cor obtida e rugosidade da superfície das amostras foram avaliados. Resultados foram submetidos a análise estatística com nível de significância em 5%, revelaram semelhança entre os géis quanto a eficácia clareadora e padrões de rugosidade e que tempos de aplicação mais longos tendem a gerar maiores valores de rugosidade. Concluiu-se que tempos de aplicação mais curtos do gel clareador são mais eficientes uma vez que geram menos danos ao esmalte e são capazes de clarear de igual forma e que o uso de creme dental dessensibilizante a base de Bicarbonato de Arginina previamente ao clareamento não altera o efeito clareador.
Beltrami, Mateus. "Desenvolvimento e construção de sensor magnetoelástico de pH com eletrônica portátil". reponame:Repositório Institucional da UCS, 2016. https://repositorio.ucs.br/handle/11338/1259.
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Fundação de Amparo à Pesquisa do Estado do Rio Grande do Sul, FAPERGS
Sensors with magnetoelastic materials are being developed for possible wireless measurements. They show variation of the resonance frequency (decrease) when subjected to a loading mass. May be employed for detection and determination of physical quantities via remote instrumentation that is becoming increasingly important. These quantities could be the pH of a solution or the detection of the presence of microorganisms. In this work, we describe a rapid and wireless detection system for physical quantities such as pH and the presence of microorganisms. We used as substrates strips of amorphous magnetoelastic material Metglas 2826MB3. The material was cut into strips with sizes of 30 mm x 6 mm and 5 mm x 1 mm, using a micro-dicing saw. Part of these were coated with thin layers of Cr and Au through sputtering. We developed a portable electronic device with the function of determining the resonance frequency of the magnetoelastic strips. This device can operate completely standalone or in conjunction with a computer. It is composed of a central processing, auxiliary circuits and input and output interface of data. The portable device produces a variable magnetic field, which in turn produces a longitudinal elastic wave which is detected magnetically. Tests were carried out with the bare transducer as well as after the application of pH-sensitive layers or material for the capture of microorganisms. For pH sensors we used transducer strips coated with Cr and Au and then applied a layer of cystamine (CYS) to promote adherence to the copolymer of acrylic acid and iso-octyl acrylate. The pH sensor was exposed to a range of pH (1.5 to 7.5) and was measured using the portable device and compared with results from an Agilent E5061B Network Analyzer. The measurements of the resonance frequency of the pH sensor showed a 70 Hz/pH variation for strips of 30 mm x 6 mm and 1000 Hz/pH for strips measuring 5 mm x 1 mm. Measurements were also carried out with the transducer functionalized using poly-l-lysine to capture S. cerevisiae. With the adherence of S. cerevisiae on the sensor surface, there was a reduction of the resonance frequency 531 Hz, which agrees quantitatively with values calculated for mass loading.
Westman, Ewa. "The impact of protein modification on immunogenicity and arthritogenicity /". Stockholm, 2005. http://diss.kib.ki.se/2005/91-7140-485-6/.
Pełny tekst źródłaSoares, Ana Flávia. "Comprometimento do esmalte bovino após escovação em função do condicionamento ácido, clareamento ativado com luz híbrida, concentração e pH dos géis clareadores". Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/25/25148/tde-05042013-145654/.
Pełny tekst źródłaThis in vitro study evaluated the influence of whitening activated with hybrid light on the function variations of the pH level and concentration of bleaching gels and prior acid etching of bovine enamel and the change in roughness and wear after simulated tooth brushing. Fragments of enamel (1.5 cm x 0.5 cm x 0.4 cm) were divided into two parts, one half as the control and the other as the test area. The latter was divided into two halves, one of which received the etching added to the whitening gel and the other with only the whitening gel. The specimens were randomly divided into six groups (n = 10): C = control; TBO35LH = 35% Total Blanc Office 1x session (5x8\') + activation with hybrid light LED/Laser; LPS35LH = 35% Lase Peroxide Sense - 1x session (5x8\') + activation with hybrid light LED/Laser; LPS25LH = 25% Sense Lase Peroxide - 1x session (5x8\') + activation with hybrid light LED/Laser; LPL15LH = 15% Lase Peroxide Lite - 1x session (5x8 \') + activation with hybrid light LED/Laser; LPL10LHV = 10% Lase Peroxide Lite - 1x session (5x8\') + activation with violet hybrid light LED/Laser. The arithmetic roughness (Ra) started after bleaching and after brushing was determined by averaging (μm) the three readings (in each area - with and without acid for a total of six readings per specimen) with a Rugosimeter Hommel Tester T 1000. The mean pH values were determined by the Sentron Model 1001 digital pH meter at the start and end times. The specimens were stored in artificial saliva for seven days, and subjected to 100,000 cycles of simulated brushing. After 24 hours, the surface wear was determined (μm) employing the same roughness meter. In relation to the change in wear and surface roughness, the results were evaluated by two way ANOVA testing for repeated measures and later, a Tukey\'s test. The data obtained from the pH readings were submitted to two way ANOVA testing for repeated measures and the Kruskal Wallis and Tukey tests for the comparisons between the individual groups. The significance level was set at 5% for all the tests. The roughness and wear showed statistical differences between the groups, especially when compared to the area with and without acid. The bleaching gels tended to decrease in pH from the starting time to the final time, however, a correlation with the roughness and wear could not be clearly established.
Lima, Regina Karla de Pontes [UNESP]. "Avaliação da difusão de íons hidroxila e da atividade antibacteriana de medicação intracanal á base de hidróxido de cálcio". Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/101638.
Pełny tekst źródłaConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Este estudo objetivou avaliar a capacidade de liberação e difusão de íons hidroxila, e a atividade antibacteriana de medicações intracanal, in vitro. No primeiro experimento, canais radiculares de dentes bovinos foram instrumentados. Uma cavidade de 4 mm de comprimento, 2 mm de largura e 0,5 mm de profundidade foi confeccionada no terço médio/apical radicular de cada amostra. A abertura coronária e a superfície externa radicular foram seladas com adesivo e esmalte para unhas, exceto a área da cavidade preparada. Os canais radiculares foram preenchidos com as seguintes medicações: G1: hidróxido de cálcio (Ca(OH)2)/soro; G2: Calen; G3: Calen/PMCC; G4: Calen/Clorexidina (CLX) a 0,4%. Os dentes foram armazenados individualmente em frascos contendo água destilada a 37oC. As medições do pH foram realizadas nos períodos de 1, 3, 7, 14, 21, 30 e 60 dias, com utilização de pHmetro digital. Os resultados mostraram aumento significativo do pH a partir de 3 dias para a pasta Calen/CLX e para as demais pastas a partir de 7 até os 14 dias. Para a pasta Calen ocorreu aumento até os 21 dias. A pasta Calen/PMCC apresentou pH mais elevado até 21 dias, sendo os resultados semelhantes para todos grupos aos 30 dias. Aos 60 dias, os maiores valores de pH foram observados para as pastas Calen/PMCC e Calen. Conclui-se que as diferentes composições de pastas à base de Ca(OH)2 proporcionam difusão de íons hidroxila pela dentina radicular. Em outro experimento, 106 dentes humanos unirradiculados tiveram seus canais radiculares contaminados com Enterococcus faecalis e incubados a 37°C por 21 dias. Em seguida, foram divididos de acordo com a medicação intracanal e o período em: G1: Calen - 7 dias; G2: Calen - 14 dias; G3: Calen/PMCC - 7 dias; G4: Calen/PMCC - 14 dias; G5: Calen/CLX a 0,4% - 7 dias; G6: Calen/CLX a 0,4% - 14 dias; G7: Calen/CLX a 1% - 7 dias; G8: Calen/CLX a 1% - 14 dias....
The aim of this study was to evaluate the release and diffusion of hydroxil ions, and the antibacterial activity of intracanal medication, in vitro. At first study, root canals from bovine teeth were instrumented. A cavity with 4 mm of length, 2 mm of width and 0.5 mm of depth was opened at middle/apical third of each sample. The coronal opening and the external surface of the roots were coated with a nail polish layer and a layer of sticky wax, except on the cavity area. Root canals were filled with the following intracanal medication: G1: calcium hydroxide powder with saline solution (Ca(OH)2); G2: Calen; G3: Calen/PMCC; G4: Calen/Chlorhexidine (CHX) 0.4%. Teeth were stored individually in recipients with distilled water at 37oC. Measurements of pH were made at periods of 1, 3, 5, 7, 14, 21, 30 and 60 days, using a digital pH meter. Results showed a significant increase of pH from 3 days for Calen/PMCC, and from 7 until 14 days for the other medications. For Calen, an increase was observed until 21 days. Calen/PMCC showed the highest pH until 21 days, and all the groups had similar results at 30 days. At 60 days, the highest pH values were observed for Calen/PMCC and Calen. It is possible to conclude that different compositions of calcium hydroxide pastes caused diffusion of hydroxil ions through radicular dentin. In another study, 106 single-rooted human teeth had their root canals contaminated with Enterococcus faecalis and incubated at 37oC for 21 days. Then, these teeth were divided according to intracanal medication and periods: G1: Calen - 7 days; G2: Calen - 14 days; G3: Calen/PMCC - 7 days; G4: Calen/PMCC - 14 days; G5: Calen/CHX 0.4% - 7 days; G6: Calen/CHX 0.4% - 14 days; G7: Calen/CHX 1% - 7 days; G8: Calen/CHX 1% - 14 days. Microbiological samples were collected immediately after intracanal medication removal and after seven days. After serial 10-fold dilutions and culture... (Complete abstract click electronic access below)
Romão, Dayse Andrade 1983. "Validação de um modelo de ciclagens erosivas para estimar o efeito dose-resposta do pH na erosão inicial do esmalte dental". [s.n.], 2014. http://repositorio.unicamp.br/jspui/handle/REPOSIP/290564.
Pełny tekst źródłaDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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Resumo: Modelos in vitro devem mimetizar situações próximas das condições reais, entretanto poucos modelos para avaliar erosão em esmalte dentário nestas condições são encontrados na literatura, além de apresentarem algumas limitações. Assim, o objetivo do presente estudo foi validar um modelo de ciclagens erosivas que simule os episódios de erosão/exposição do esmalte dental à saliva, avaliando o efeito dose-resposta para soluções de ácido cítrico com diferentes valores de pH. O modelo de ciclagens erosivas de pH teve uma duração de 5 dias, de forma que blocos de esmalte bovino, selecionados quanto à dureza de superfície e análise de perfilometria, foram imersos em saliva humana estimulada por 1 h a 37ºC sob agitação (100 rpm) antes do primeiro desafio erosivo de cada dia para formação de película adquirida. Em seguida os blocos dentais foram tratados 4 vezes ao dia com a solução de tratamento (2,5 mL/mm2 de área exposta de esmalte dental) sob agitação (100 rpm) por 1 min e nos intervalos entre os tratamentos e durante à noite, os blocos foram imersos em saliva artificial a 37?C sem agitação. Para avaliação do modelo quanto ao efeito dose-resposta ao pH, os blocos (n=12) foram tratados com as seguintes soluções: G1 - cacodilato pH 7,0 (controle); G2 - ácido cítrico pH 2,5; G3 - ácido cítrico pH 3,5; G4 - ácido cítrico pH 4,5; G5 - ácido cítrico pH 5,5; G6 - ácido cítrico pH 7,0. Todas as soluções foram preparadas na concentração de 47,6 mM. Diariamente, ao final da ciclagem e após a imersão na saliva artificial durante à noite, os blocos foram avaliados quanto à dureza de superfície para cálculo da porcentagem de perda de dureza de superfície (%PDS) e ao final do experimento a análise perfilométrica foi novamente realizada. Os resultados foram submetidos à análise de variância e teste de Tukey(p<0,05). Os resultados ao final da ciclagem mostraram que houve um aumento crescente da %PDS em função dos dias na maioria dos grupos e que os blocos tratados com solução de pH 2,5 apresentaram a maior %PDS (p<0,05). Na comparação entre grupos os resultados demonstram que no 4o dia de ciclagem foram verificadas diferenças significativas entre todos os grupos (p<0,05). Já os resultados após saliva apresentaram menores valores de %PDS quando comparados àqueles após ciclagem. Quanto à perfilometria, os blocos dentais tratados com soluções de pH 2,5 e 3,5 apresentaram as maiores perdas de superfície, diferindo entre si e dos demais grupos (p<0,05). Conclui-se que o estudo proposto permitiu a validação de um modelo de ciclagens erosivas que demonstrou efeito dose-resposta para erosão inicial de esmalte dentário após exposição a diferentes valores de pH
Abstract: In vitro models should mimic situations close to the real conditions, however, few models to assess tooth enamel erosion in these conditions are found in the literature, besides presenting some limitations. Thus, the objective of this study was validate a model that simulates cycling episodes of erosion/exposure of dental enamel to saliva, evaluating the dose-response effect for citric acid solutions with different pH values. The model of erosive cycling lasted 5 days, and bovine enamel blocks, selected according to the surface hardness and surface profilometry analysis, were immersed in stimulated human saliva for 1 h at 37°C under agitation (100 rpm) before the first erosive challenge in each day for salivary pellicle formation. Then the dental blocks were treated 4 times daily with the treatment solution (2.5 mL/mm2 per area of exposed enamel) under stirring (100 rpm) for 1 min and in the intervals between treatments and during the nigth the blocks were immersed in artificial saliva at 37?C without stirring. To evaluate the model with regard to the dose-response to pH, blocks (n = 12) were treated with the following solutions: G1 - cacodylate pH 7.0 (control), G2 - citric acid pH 2.5, G3 - acid citric pH 3.5; G4 - citric acid pH 4.5; G5 - citric acid pH 5.5; G6 - citric acid pH 7.0. All the solutions were prepared in a concentration of 47.6 mM. Daily, at the end of the cycling and after immersion in artificial saliva during the night, the blocks were evaluated for surface hardness to calculate the percentage of surface hardness loss (%SHL) and at the end of the experiment profilometry analysis was performed again. The results were submitted to ANOVA and Tukey's test (p<0.05). The results showed a gradual increase in the %SHL at the end of the cycling model as a function of days in most of the groups and the blocks treated with pH 2.5 solution showed the highest %SHL (p<0.05). In the comparison of the groups, the results showed in the 4th cycling day significant differences among all groups (p<0.05). The results after saliva exposure showed lower %SHL when compared to those after cycling. Regarding profilometry, dental blocks treated with solutions pH 2.5 and 3.5 showed the highest surface losses, differing from each other and from the other groups (p<0.05). In conclusion, the proposed study allowed the validation of an erosive cycling model that demonstrated dose-response effect for early tooth enamel erosion after exposure to different pH values
Mestrado
Cariologia
Mestra em Odontologia
Yanaka, Rodrigo. "Determinação do período de absorção de imunoglobulinas pela mucosa intestinal de cabritos : influência do tempo decorrido entre o nascimento e a ingestão de colostro nos parâmetros bioquímicos, hemogasométricos e imunológicos de caprinos recém-nascidos /". Araçatuba : [s.n.], 2009. http://hdl.handle.net/11449/92208.
Pełny tekst źródłaBanca: Raimundo de Souza Lopes
Banca: José Jurandir Fagliari
Resumo: Os objetivos deste estudo foram determinar o período de absorção intestinal de macromoléculas colostrais em cabritos alimentados com colostro bovino e caprino, e avaliar a variação dos parâmetros bioquímicos, hemogasométricos e imunológicos de cabras e cabritos no período até 75 dias pós-parto. Para tanto, determinaram-se as concentrações séricas de proteína total (refratometria), separação eletroforética das frações protéicas (eletroforese em acetato de celulose), imunoglobulina G (IgG) bovina e caprina (imunodifusão radial), as atividades séricas de aspartatoaminotransferase (AST), fosfatase alcalina (FA), gamaglutamiltransferase (GGT), os teores de creatinina e ureia, e os valores hemogasométricos e glicêmicos, nos momentos zero, dois, sete, 15, 30 e 75 dias pós-parto. Os cabritos que ingeriram colostro bovino até 12 horas pós-nascimento adquiriram títulos regulares de imunoglobulinas. Após 22 horas pós-parto, os cabritos não tiveram absorção adequada de macromoléculas colostrais, sendo classificados como portadores de falha de transferência de imunidade passiva. Aos 75 dias, todos os cabritos possuíam inadequadas concentrações de IgG. Os cabritos alimentados com colostro caprino tiveram concentrações mais elevadas de IgG quando comparados aos daqueles que ingeriram colostro bovino. Aos dois dias pósnascimento a concentração de GGT teve correlação significativa com a IgG, podendo, esta enzima, ser utilizada na avaliação da transferência de imunidade passiva. As cabras e os cabritos tiveram variações protéicas, bioquímicas e hemogasométricas até os 75 dias pós-parto, com pouca relevância clínica.
Abstract: The aims of this study was to determine the absorption period of colostrum macromolecules by intestinal wall of goat kids fed bovine or caprine colostrum, and evaluate the variation of biochemistry, blood gas and immunologic parameters of goats and kids at post-partum period until 75 days. To accomplish these objectives the serum concentrations of total protein (refractometry), electrophoretic proteins fractions separation (acetate cellulose electrophoresis), bovine and caprine immunoglobulin G (IgG) by radial immunodiffusion assay, biochemicals assays for aspartateaminotransferase (AST), alkaline phosphatase (ALP), gammaglutamyltransferase (GGT), creatinine and urea, hole blood assays for blood gas parameters and glycemia were determined at zero, two, seven, 15, 30 and 75 days postpartum. Kids which fed bovine colostrum until 12 hours after birth have acquired regular immunoglobulins titres. After 22 hours postpartum kids didn't presented adequate absorption of colostrum macromolecules, being classified as failure of passive immunity transference. Although all kids presented bovine IgG at 75 days after birth, their low concentrations doesn't provide adequate protection. Kids fed caprine colostrum presented higher concentrations of IgG compared to those fed bovine colostrum. At two days after birth GGT concentration correlated significantly with IgG, so it can be used as passive immunity predictor. Goats and kids had variations on protein, biochemical and blood gas variables until 75 days postpartum, but with physiological and/or nutritional causes, these findings had little clinical relevance for the animals.
Mestre
Nunes, Ana Rita Silva Martins. "O2/CO2-sensitive cyclic AMP-signalling pathway in peripheral chemoreceptors". Doctoral thesis, Faculdade de Ciências Médicas. UNL, 2013. http://hdl.handle.net/10362/9153.
Pełny tekst źródłaYanaka, Rodrigo [UNESP]. "Determinação do período de absorção de imunoglobulinas pela mucosa intestinal de cabritos: influência do tempo decorrido entre o nascimento e a ingestão de colostro nos parâmetros bioquímicos, hemogasométricos e imunológicos de caprinos recém-nascidos". Universidade Estadual Paulista (UNESP), 2009. http://hdl.handle.net/11449/92208.
Pełny tekst źródłaFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Os objetivos deste estudo foram determinar o período de absorção intestinal de macromoléculas colostrais em cabritos alimentados com colostro bovino e caprino, e avaliar a variação dos parâmetros bioquímicos, hemogasométricos e imunológicos de cabras e cabritos no período até 75 dias pós-parto. Para tanto, determinaram-se as concentrações séricas de proteína total (refratometria), separação eletroforética das frações protéicas (eletroforese em acetato de celulose), imunoglobulina G (IgG) bovina e caprina (imunodifusão radial), as atividades séricas de aspartatoaminotransferase (AST), fosfatase alcalina (FA), gamaglutamiltransferase (GGT), os teores de creatinina e ureia, e os valores hemogasométricos e glicêmicos, nos momentos zero, dois, sete, 15, 30 e 75 dias pós-parto. Os cabritos que ingeriram colostro bovino até 12 horas pós-nascimento adquiriram títulos regulares de imunoglobulinas. Após 22 horas pós-parto, os cabritos não tiveram absorção adequada de macromoléculas colostrais, sendo classificados como portadores de falha de transferência de imunidade passiva. Aos 75 dias, todos os cabritos possuíam inadequadas concentrações de IgG. Os cabritos alimentados com colostro caprino tiveram concentrações mais elevadas de IgG quando comparados aos daqueles que ingeriram colostro bovino. Aos dois dias pósnascimento a concentração de GGT teve correlação significativa com a IgG, podendo, esta enzima, ser utilizada na avaliação da transferência de imunidade passiva. As cabras e os cabritos tiveram variações protéicas, bioquímicas e hemogasométricas até os 75 dias pós-parto, com pouca relevância clínica.
The aims of this study was to determine the absorption period of colostrum macromolecules by intestinal wall of goat kids fed bovine or caprine colostrum, and evaluate the variation of biochemistry, blood gas and immunologic parameters of goats and kids at post-partum period until 75 days. To accomplish these objectives the serum concentrations of total protein (refractometry), electrophoretic proteins fractions separation (acetate cellulose electrophoresis), bovine and caprine immunoglobulin G (IgG) by radial immunodiffusion assay, biochemicals assays for aspartateaminotransferase (AST), alkaline phosphatase (ALP), gammaglutamyltransferase (GGT), creatinine and urea, hole blood assays for blood gas parameters and glycemia were determined at zero, two, seven, 15, 30 and 75 days postpartum. Kids which fed bovine colostrum until 12 hours after birth have acquired regular immunoglobulins titres. After 22 hours postpartum kids didn’t presented adequate absorption of colostrum macromolecules, being classified as failure of passive immunity transference. Although all kids presented bovine IgG at 75 days after birth, their low concentrations doesn’t provide adequate protection. Kids fed caprine colostrum presented higher concentrations of IgG compared to those fed bovine colostrum. At two days after birth GGT concentration correlated significantly with IgG, so it can be used as passive immunity predictor. Goats and kids had variations on protein, biochemical and blood gas variables until 75 days postpartum, but with physiological and/or nutritional causes, these findings had little clinical relevance for the animals.
Lima, Regina Karla de Pontes. "Avaliação da difusão de íons hidroxila e da atividade antibacteriana de medicação intracanal á base de hidróxido de cálcio /". Araraquara : [s.n], 2010. http://hdl.handle.net/11449/101638.
Pełny tekst źródłaBanca: Evandro Watanabe
Banca: Igor Prokopowitsch
Banca: Gisele Faria
Banca: Idomeo Bonetti Filho
Resumo: Este estudo objetivou avaliar a capacidade de liberação e difusão de íons hidroxila, e a atividade antibacteriana de medicações intracanal, in vitro. No primeiro experimento, canais radiculares de dentes bovinos foram instrumentados. Uma cavidade de 4 mm de comprimento, 2 mm de largura e 0,5 mm de profundidade foi confeccionada no terço médio/apical radicular de cada amostra. A abertura coronária e a superfície externa radicular foram seladas com adesivo e esmalte para unhas, exceto a área da cavidade preparada. Os canais radiculares foram preenchidos com as seguintes medicações: G1: hidróxido de cálcio (Ca(OH)2)/soro; G2: Calen; G3: Calen/PMCC; G4: Calen/Clorexidina (CLX) a 0,4%. Os dentes foram armazenados individualmente em frascos contendo água destilada a 37oC. As medições do pH foram realizadas nos períodos de 1, 3, 7, 14, 21, 30 e 60 dias, com utilização de pHmetro digital. Os resultados mostraram aumento significativo do pH a partir de 3 dias para a pasta Calen/CLX e para as demais pastas a partir de 7 até os 14 dias. Para a pasta Calen ocorreu aumento até os 21 dias. A pasta Calen/PMCC apresentou pH mais elevado até 21 dias, sendo os resultados semelhantes para todos grupos aos 30 dias. Aos 60 dias, os maiores valores de pH foram observados para as pastas Calen/PMCC e Calen. Conclui-se que as diferentes composições de pastas à base de Ca(OH)2 proporcionam difusão de íons hidroxila pela dentina radicular. Em outro experimento, 106 dentes humanos unirradiculados tiveram seus canais radiculares contaminados com Enterococcus faecalis e incubados a 37°C por 21 dias. Em seguida, foram divididos de acordo com a medicação intracanal e o período em: G1: Calen - 7 dias; G2: Calen - 14 dias; G3: Calen/PMCC - 7 dias; G4: Calen/PMCC - 14 dias; G5: Calen/CLX a 0,4% - 7 dias; G6: Calen/CLX a 0,4% - 14 dias; G7: Calen/CLX a 1% - 7 dias; G8: Calen/CLX a 1% - 14 dias.... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: The aim of this study was to evaluate the release and diffusion of hydroxil ions, and the antibacterial activity of intracanal medication, in vitro. At first study, root canals from bovine teeth were instrumented. A cavity with 4 mm of length, 2 mm of width and 0.5 mm of depth was opened at middle/apical third of each sample. The coronal opening and the external surface of the roots were coated with a nail polish layer and a layer of sticky wax, except on the cavity area. Root canals were filled with the following intracanal medication: G1: calcium hydroxide powder with saline solution (Ca(OH)2); G2: Calen; G3: Calen/PMCC; G4: Calen/Chlorhexidine (CHX) 0.4%. Teeth were stored individually in recipients with distilled water at 37oC. Measurements of pH were made at periods of 1, 3, 5, 7, 14, 21, 30 and 60 days, using a digital pH meter. Results showed a significant increase of pH from 3 days for Calen/PMCC, and from 7 until 14 days for the other medications. For Calen, an increase was observed until 21 days. Calen/PMCC showed the highest pH until 21 days, and all the groups had similar results at 30 days. At 60 days, the highest pH values were observed for Calen/PMCC and Calen. It is possible to conclude that different compositions of calcium hydroxide pastes caused diffusion of hydroxil ions through radicular dentin. In another study, 106 single-rooted human teeth had their root canals contaminated with Enterococcus faecalis and incubated at 37oC for 21 days. Then, these teeth were divided according to intracanal medication and periods: G1: Calen - 7 days; G2: Calen - 14 days; G3: Calen/PMCC - 7 days; G4: Calen/PMCC - 14 days; G5: Calen/CHX 0.4% - 7 days; G6: Calen/CHX 0.4% - 14 days; G7: Calen/CHX 1% - 7 days; G8: Calen/CHX 1% - 14 days. Microbiological samples were collected immediately after intracanal medication removal and after seven days. After serial 10-fold dilutions and culture... (Complete abstract click electronic access below)
Doutor
Serra, Peinado Carla. "Papel del citoesqueleto de actina en la regulación de la H+-ATPasa vacuolar de complejo de Golgi". Doctoral thesis, Universitat de Barcelona, 2014. http://hdl.handle.net/10803/663846.
Pełny tekst źródłaWe previously reported that agents that depolymerize actin filaments promote the alkalization of the Golgi stack and the trans-Golgi network. Vacuolar-type H-translocating ATPase (V-ATPase) is responsible of proton translocation and acidification of Golgi lumen. V-ATPase is a multisubunit complex composed of two domains (V1 and V0). Moreover, two subunits of V1 domain contain actin binding sides, subunit B and C. In this work we hypothesize that actin filaments could have a role in the maintaining of V1 and V0 domain association. We have generated a GFPtagged subunit B2 construct that is incorporated into the V1 domain, this construct localizes at distal Golgi compartments and translocate to cytosol upon actin depolymerization. Several biochemical assays confirmed that microfilaments distruption induces dissociation of V1-V0 domains. Moreover, we detected interaction between subunits B-C and actin filaments. Finally, V-ATPase is localized in lipid raft domains of plasma membrane and actin filaments participate in organization of these domains. We observed that lipid raft disorganization promotes an increase of intra-Golgi pH. Overall, we conclude that actin regulates the Golgi pH homeostasis maintaining the coupling of V1-V0 domains of V-ATPase through the binding of microfilaments to subunits B and C and preserving the integrity of lipid raft.
Salgado, Lívia. "Influência da alteração do pH e da degradação enzimática na rugosidade das superfícies de resinas compostas". Universidade Federal de Juiz de Fora, 2015. https://repositorio.ufjf.br/jspui/handle/ufjf/414.
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Made available in DSpace on 2016-01-25T17:38:49Z (GMT). No. of bitstreams: 1 liviasalgado.pdf: 1200969 bytes, checksum: 244d1e72c0eb8f8d2b1211681283ab46 (MD5) Previous issue date: 2015-04-27
FAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas Gerais
Avaliou-se a rugosidade das superfícies de duas resinas compostas, antes e após a sua imersão em solução aquosa com diferentes pH e solução enzimática. Para a confecção dos 60 corpos de prova, 30 para cada resina composta, utilizou-se uma matriz de acrílico com 5mm de diâmetro e 2mm de espessura, sobre uma tira de poliéster posicionada em uma placa de vidro estéril que foram preenchidas com as resinas compostas Filtek Z350 (3M ESPE) e Empress Direct (Ivoclar-Vivadent), em um único incremento e sobre esta foi colocada outra tira de poliéster e procedeu a fotopolimerização por 40s. Os corpos de prova foram divididos 06 grupos (n=10) de acordo com a solução empregada: água deionizada (Grupos ZA e EA); hidróxido de sódio com pH 13.2 (Grupos ZNa e ENa) e solução enzimática de colesterol esterase (Grupos ZE e EE). Para dar acabamento utilizou-se uma sequência decrescente de granulação de lixas d’água: 600, 1000, 1200, 1500 e 2000 e para o polimento, suspensões de alumina (Arotec, São Paulo, SP, Brasi): 1μm, 0,3μm e 0,05μm. Após o polimento foram armazenados em estufa a 37°C durante 7 dias e realizadas 3 medições de cada superfície no rugosímetro e realizada a média e foram imersos individualmente nas soluções por 30 dias e mantidos em estufa a 37°C, a cada 7 dias as soluções eram trocadas. Após 30 dias foram realizadas mais 3 medições da rugosidade das superfícies e realizada a média. Foi realizada ANOVA e o teste de Tukey. A partir dos resultados obtidos conclui-se que as resinas compostas testadas apresentaram degradação hidrolítica apenas na solução aquosa por um período de imersão de 30 dias.
The roughness of the surfaces was evaluated two composites before and after their immersion in aqueous solutions with different pH and the enzyme solution. For producing the 60 test specimens, 30 for each composite was used an acrylic matrix with 5mm in diameter and 2mm thick on a polyester strip placed on a sterile glass plate were filled with the resins Filtek Z350 (3M ESPE) and Empress Direct (Ivoclar Vivadent-) in a single increment and this was placed on another strip of polyester and proceeded to light curing for 40 seconds. The specimens were divided 06 groups (n = 10) according to the used solution: deionized water (ZA Groups and EA); sodium hydroxide at pH 13.2 (ZNA Groups ENA) and enzyme solution of cholesterol esterase (ZE and EE groups). To finish used a descending sequence of sanding granulation water: 600, 1000, 1200, 1500 and 2000 and for polishing alumina suspensions (Arotec, São Paulo, SP, Brasi): 1μm, and 0,3μm 0,05μm. After polishing were stored at 37 ° C for 7 days and 3 measurements carried out on each surface roughness and the carried medium and were immersed in individual solutions and kept for 30 days at 37 ° C every 7 days the solutions were exchanged. After 30 days there were over 3 measurements of surface roughness and made average. ANOVA and Tukey test was performed. From the results obtained it is concluded that the composites tested showed hydrolytic degradation in aqueous solution only for a period of 30 days immersion.
Reinholz, Uwe. "Darstellung eines Referenzmaterials für die ortsaufgelöste Wasserstoffanalytik in oberflächennahen Schichten mittels Kernreaktionsanalyse". Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2007. http://nbn-resolving.de/urn:nbn:de:swb:14-1176198574703-16051.
Pełny tekst źródłaNiigaki, Juliana Ikeda. "Dopplervelocimetria da artéria cerebral média fetal na predição da acidemia no nascimento em gestações com insuficiência placentária". Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/5/5139/tde-08042014-090931/.
Pełny tekst źródłaObjectives: To evaluate the relationship between middle cerebral artery (MCA) parameters and acidemia at birth, in pregnancies complicated by placental insufficiency. Methods: The study was performed as a prospective cross-sectional analysis of Doppler measurements in 91 patients with the diagnosis of placental dysfunction by abnormal umbilical artery (UA) Doppler (pulsatility index [PI] > p95). Inclusion criteria were: singleton pregnancy, intact membranes, abscence of fetal congenital or chromosomal abnormalities. The Doppler parameters analyzed were: UA PI, MCA PI, MCA peak systolic velocity (PSV), cerebroplacental ratio (CPR) and pulsatilility index for veins (PIV) of ductus venosus (DV). It was analyzed the last assessment obtained right before birth or the antenatal steroids. Umbical artey blood samples were collected at birth, and acidemia was defined as pH below 7.20. Results: Forty seven (51.6%) newborns had acidemia at birth. Those who developed acidemia showed a UA PI z-score significantly higher (median 2.1 vs 1.7, p = 0.014), as well as a higher proportion of cases with absent or reverse end diastolic flow (51.0% vs 31.8%, p = 0.006). Regarding the MAC, the PI z-score was significantly lower in cases with pH < 7.20 (median -2.7 vs. -2.1, p = 0.042), but concerning PSV z-score, no significant relation between the groups could be established (p = 0.051).The acidemia at birth was associated with lower values of CPR (median 0.5 vs 0.7, p = 0.006), but not with its z-score (p = 0.055). In relation to the venous territory, greater values of DV PIV z-score were associated with acidemia (median 2.4 vs 0.6, p = 0.015).The correlation analysis between the pH values at birth and the Doppler measurements, a significant correlation was observed between the pH at birth and UA PI z-score (rho = -0.31, p = 0.003 ), MCA PI z-score (rho = 0.26, p = 0.012), CPR z-score (rho 0.25, p = 0.015), PIV DV zscore (rho = -0.32, p = 0.002), and PSV MCA MoM (rho = -0.21, p = 0.042). Logistic regression identified the UA PI z-score and the MCA PI z-score as independent predictors for acidemia at birth, correctly classifying 67.03% of cases. Conclusion: In pregnancies with placental insufficiency, the UA PI and the MCA PI are independent predictors associated with acidemia at birth. This study reinforces that the degree of placental insufficiency and the fetal adaptation capacity are directly related to acidemia at birth
Cheng, Chin-Min. "Leaching of coal combustion products field and laboratory studies /". Columbus, Ohio : Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1133195856.
Pełny tekst źródłaReinholz, Uwe. "Darstellung eines Referenzmaterials für die ortsaufgelöste Wasserstoffanalytik in oberflächennahen Schichten mittels Kernreaktionsanalyse". Doctoral thesis, Technische Universität Dresden, 2005. https://tud.qucosa.de/id/qucosa%3A24977.
Pełny tekst źródłaFrancisconi, dos Rios Luciana Fávaro, Leslie Casas-Apayco, Marcela Pagani Calabria, Paulo Afonso Silveria Francisconi, Ana Flávia Sanches Borges i Linda Wang. "Role of chlorhexidine in bond strength to artificially eroded dentin over time". Quintessence Publishing Group, 2015. http://hdl.handle.net/10757/607257.
Pełny tekst źródłaPURPOSE: To assess the long-term effect of a 2% aqueous chlorhexidine (CHX) solution on bond strength to artificially eroded dentin compared to sound dentin. MATERIALS AND METHODS: Flat mid-coronal dentin surfaces of extracted third molars (n = 28) were subjected only to grinding with a 600-grit SiC paper for 1 min (sound dentin S, n = 14) or additionally to erosive pH cycling with a cola-based soft-drink (eroded dentin E, n = 14). After acid etching, rinsing, and air drying, S and E were rehydrated with 1.5 μl of 2% CHX (S2%, n = 7; E2%, n = 7) or of distilled water (control SC, n = 7; EC, n = 7). Composite buildups were incrementally constructed with Filtek Z350 following Adper Single Bond 2 application. Specimens were sectioned into beams, which were subjected to microtensile testing immediately or after 6 or 12 months of aging. Fractured surfaces were observed under a digital microscope (50X magnification). Microtensile bond strength (μTBS) (MPa) was analyzed by three-way ANOVA and Tukey's tests (α = 0.05) and failure mode by the Kruskal-Wallis test (α = 0.05). RESULTS: Compared to sound dentin, eroded dentin was consistently related to lower μTBS. Immediately and after 12-month aging, the effect of CHX was insignificant, but it was significant after 6-month aging, when it conserved the bond strength to both eroded and sound dentin. The percentage of adhesive and mixed failures were equivalent, and significantly more frequent than cohesive failures, whether in dentin or in composite. CONCLUSION: The 2% CHX effect on bond strength conservation to both eroded and sound dentin was not found to be persistent.
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