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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.
21

Rela??es anat?micas entre a origem e a distribui??o da art?ria cel?aca no gato dom?stico. / Anatomical relationships of the origin and distribution of the celiac artery in the domestic cat.

Silva, Barbara Xavier 27 August 2010 (has links)
Submitted by Sandra Pereira (srpereira@ufrrj.br) on 2017-05-30T16:11:15Z No. of bitstreams: 1 2010 - B?rbara Xavier Silva.pdf: 1788178 bytes, checksum: 96ff6d70aeb442564d90879a261fb5f6 (MD5) / Made available in DSpace on 2017-05-30T16:11:15Z (GMT). No. of bitstreams: 1 2010 - B?rbara Xavier Silva.pdf: 1788178 bytes, checksum: 96ff6d70aeb442564d90879a261fb5f6 (MD5) Previous issue date: 2010-08-27 / The knowledge of anatomical variations is important for radiological and surgical procedures and has a theoretical and practical significance for experimental research and surgical practice in domestic animals. The aim of this study was to describe the origin and measures of the main branches of celiac artery in domestic cats of both sexes. The anatomical dissections were performed on 30 cadavers of adult cats, 15 male and 15 female, with a rostrum-sacral length of 47.9 cm and 46.6 cm respectively. Cats were positioned in right lateral decubit and a thoracic incision was made to remove the 6th to 10th ribs to cannulate the thoracic portion of aorta. The vascular system was fixated with 10% formaldehyde solution and then filled with coloured Petrolatex S-65. After five days emerged in 10% formaldehyde solution, all the animals were washed in current water. The celiac artery and its proximal branches were ?in situ? dissected, lengthen and measured with a pachymeter. No organs were removed. The average length and standard deviation of the celiac, lienal, left gastric and hepatic artery were calculated and compared in both sexes by unpaired t test. To verify if the frequency distributions observed for the 30 examined animals is in accordance with the literature, we performed the Qui-square test, with a 5% level of significance, to test if the nullity hypothesis is true for the origin of the celiac artery, number of gastric arteries, and the number of lienal artery main ramifications. The relationship between the celiac, lienal, left gastric and hepatic artery length, with rostrum-sacral length was calculated by the correlation coefficient ?r? varying between -1 r +1. The celiac artery arose as a single artery in 15 (100%) females. In males the celiac artery arose as a single artery in 12 (80%) cats; in three (20%) cats we observed the presence of celiac-mesenteric trunk. The average length of the celiac artery in females was 1.32 cm, and originated at the level of the 13th thoracic vertebra in two (13.3%) animals, between the 13th and the 1st lumbar vertebra in one (6.7%) animal, at the level of 1st lumbar vertebra in six (40%) cats, and between the 1st and 2nd lumbar vertebra in six (40%) cats. The average length of the celiac artery in males was 1.27 cm, and originated at the level of 13th thoracic vertebra in three (20%) animals, between 13th thoracic vertebra and 1st lumbar vertebra in three (20%) animals, at the level of 1st lumbar vertebra in four (26.7%) animals, between 1st and 2nd lumbar vertebra in one (6.7%) and at the level of the 2nd lumbar vertebra in four (26.7%) animals. In female the gastrolienal trunk was the predominant morphological arrangement (53.3%) with medium length of 0.31 cm. In males, the classic celiac trifurcation was the predominant morphological arrangement (53.3%). No relation was observed between the celiac, lienal, left gastric and hepatic artery length and the rostrum-sacral length in cats. The origin of the celiac artery, number of gastric arteries, and the number of lienal artery main ramifications are not gender dependent. / O conhecimento das varia??es anat?micas ? importante para procedimentos cir?rgicos e radiol?gicos e tem um significado pr?tico e te?rico para a pesquisa experimental e a pr?tica cir?rgica em animais dom?sticos. O objetivo deste estudo foi descrever a origem e medidas da art?ria cel?aca e de suas ramifica??es em gatos de ambos sexos correlacionando seus valores com o comprimento do animal. As dissec??es foram realizadas em 30 cad?veres de gatos adultos, 15 machos e 15 f?meas, com m?dia do comprimento rostro-sacral de 47,9cm e 46,6 cm respectivamente. Os gatos foram posicionados em dec?bito lateral direito e feita uma incis?o tor?cica para remo??o da 6? a 10? costelas para canula??o da por??o tor?cica da aorta. Em seguida, o sistema vascular foi fixado com solu??o de formaldeido a 10% e preenchidos com solu??o de Petrolatex S-65 corado. Ap?s cinco dias imersos em solu??o de formaldeido a 10%, todos os animais foram lavados em ?gua corrente. A art?ria cel?aca e seus ramos proximais foram dissecados "in situ" e medidos com um paqu?metro. O comprimento m?dio e desvio padr?o da art?ria cel?aca, lienal, g?strica esquerda e hep?tica foram calculados e comparados em ambos os sexos atrav?s do teste t n?o pareado. Com o intuito de verificar se a distribui??o de freq??ncias observadas para os 30 animais examinados est? de acordo com a literatura, aplicou-se o teste do X2 (qui-quadrado) considerando o n?vel de signific?ncia 5% para testar se a hip?tese de nulidade ? verdadeira, no que diz respeito a origem da art?ria cel?aca, n?mero de art?rias g?strica, e n?mero de ramifica??es principais da art?ria lienal. Em rela??o ao comportamento conjunto do comprimento da art?ria cel?aca, lienal, g?strica esquerda e hep?tica em fun??o do comprimento rostro-sacral, optou-se por calcular o coeficiente de correla??o ?r?, que pode variar entre -1 r +1. A art?ria cel?aca surgiu como uma art?ria ?nica em 15 (100%) f?meas examinadas. Nos machos a art?ria cel?aca surgiu como uma art?ria ?nica em 12 (80%) gatos e em tr?s (20%) gatos foi observada a presen?a do tronco cel?aco-mesent?rico. O comprimento m?dio da art?ria cel?aca nas f?meas foi de 1,32 cm, emergindo em n?vel da 13? v?rtebra tor?cica em dois (13,3%) animais, entre a 13? v?rtebra tor?cica e a 1? v?rtebra lombar em um (6,7%) animal, em n?vel da 1? v?rtebra lombar em seis (40%) animais, e entre a 1? e 2? v?rtebra lombar em seis (40%) animais. O comprimento m?dio da art?ria cel?aca no sexo masculino foi de 1,27 cm, emergindo em n?vel da 13? v?rtebra tor?cica em tr?s (20%) animais, entre 13? v?rtebra tor?cica e 1? v?rtebra lombar em tr?s (20%) animais, em n?vel da 1? v?rtebra lombar em quatro (26,7%) animais, entre a 1? e 2? v?rtebra lombar em um (6,7%) e em n?vel da 2? v?rtebra lombar em quatro (26,7%) animais. Nas f?meas o tronco gastro-lienal foi o arranjo morfol?gico predominante (53,3%) com um comprimento m?dio de 0,31 cm. Nos machos, a trifurca??o cl?ssica da art?ria cel?aca foi o arranjo morfol?gico predominante (53,3%). N?o foi observada rela??o entre o comprimento da art?ria cel?aca, lienal, g?strica esquerda e hep?tica em fun??o do comprimento rostro-sacral. A origem da art?ria cel?aca, n?mero de art?rias g?stricas e n?mero de ramifica??es principais da art?ria lienal independem do sexo.
22

Fermentação alcoólica de mosto com alta concentração de açúcar / Alcoholic fermentation of high sugar concentration wort

Diogo Patrini Cerqueira 14 October 2013 (has links)
A fermentação de mosto com alta concentração de açúcar (ACA) pode ser utilizada em escala industrial para a produção de etanol combustível. Esta tecnologia apresenta vantagens como a obtenção de níveis mais elevados de etanol e a minimização dos custos de produção, em contraposição apontam novos desafios, como minimizar os efeitos do estresse, osmótico e alcoólico, que as leveduras são submetidas. A suplementação do mosto com fontes nitrogenadas pode aumentar o rendimento de etanol durante a fermentação alcoólica, visto que este elemento desempenha importantes funções na fisiologia da levedura. Para avaliar o efeito da suplementação de mosto ACA, caldo de cana-de-açúcar concentrado a 25°, 30° e 35°Brix e suplementado com sulfato de amônio foi fermentado por linhagens comerciais de levedura, PE-2 e CAT-1, a 30ºC e 60rpm e monitorado por ciclos de 24 horas. Seis ciclos fermentativos foram realizados, mediante o reciclo das células de levedura por centrifugação a 2.000 g por 15 min. Os parâmetros analisados foram o desprendimento de CO2 obtido por avaliação da massa (pesagem em balança analítica); viabilidade celular determinada pelo método de coloração com eritrosina; teor alcoólico determinado em densímetro digital, após destilação da amostra, análise de açúcares totais e residuais por cromatografia de troca iônica e a concentração de nitrogênio assimilável determinada colorimetricamente pelo método da ninidrina, utilizando glicina como padrão. A suplementação dos meios com sulfato de amônio propiciou maiores taxas reprodutivas das leveduras, formando maior biomassa em todas as concentrações de Brix estudadas. Os valores de etanol observados foram superiores nas amostras suplementadas, atingindo um teor acima de 16% (v/v) para a linhagem CAT-1 e acima de 15,5% (v/v) para a linhagem PE-2 no mosto contendo 30°Brix. Entre as linhagens, a CAT-1 foi a que suportou melhor a pressão osmótica do meio e, consequentemente, apresentou produtividade fermentativa superior, atingindo uma produção acima de 5,2g/L/h. A presença da fonte de nitrogênio mostrou ser fundamental para o processo fermentativo, principalmente em mosto ACA, com concentrações mais elevadas de açúcar. A fermentação do mosto com 25°Brix não apresentou o mesmo comportamento. / The fermentation of sugar cane wort with a high concentration of sugar (ACA, very high gravity) can be used on an industrial scale for the production of fuel ethanol. This technology has the advantage of achieving higher levels of ethanol and reduction of production costs, although the challenges are to minimize the effects of osmotic and alcohol stress that the yeasts are subjected. Supplementation with nitrogen sources provides important roles in the physiology of yeast and it can increase the yield of ethanol during fermentation. To evaluate the effect of supplementation of ACA wort, juice of sugar cane was concentrated at 25°, 30° and 35°Brix and supplemented with ammonium sulfate. The medium was fermented by commercial yeast strains, PE-2 and CAT-1, at 30° C, with orbital shaking. The process was followed in 24 hours cycles. Six fermentation cycles were performed with the yeast cells recycling. At the end of each cycle, the yeast biomass was separated from liquid fraction by centrifugation at 2,000 g for 15 min. Progress of fermentations was analyzed by measuring CO2 production by evaluating the mass reduction; yeast cell viability by staining method with erythrosine; alcoholic content of distilled sample was determined by densitometry, residual sugars were analyzed by ion exchange chromatography and assimilable nitrogen concentration determined colorimetrically by ninhydrin method, using glycine as standard. The strains PE-2 and CAT-1 with ammonium sulfate reached higher reproductive rates and improved biomass at all sugar concentrations. Higher ethanol production was observed in the supplemented samples, reaching a level above 16% (v/v) for CAT-1 strain and above 15.5% (v/v) for PE-2 strain at 30° Brix concentration. CAT-1 strain showed more tolerance with the high osmotic pressure of the medium and consequently improved productivity fermentation, reaching an ethanol production above 5.2 g/L.h. Nitrogen source proved to play a crucial role in the fermentation process, mainly in ACA wort, however, the same effect was not observed at 25°Brix.
23

Steigerung der Effizienz Hierarchischer Matrizen durch Verwendung gemeinsamer Basen

Bujack, Roxana 20 October 2017 (has links)
Viele physikalische Probleme führen zu Randwertproblemen. Dabei gilt es die Lösung einer Dfferentialgleichung zu finden, so dass auf dem Rand vorgegebene Funktionswerte, die so genannten Randbedingungen, angenommen werden. Differentialgleichungen können nur in wenigen Spezialfällen analytisch gelöst werden. Man muss also auf numerische Verfahren zurückgreifen. Ein Problem aus der Praxis ist in der Regel von zu hoher Komplexität. Wir können daher nicht davon ausgehen ein Black-Box-Verfahren zu finden, welches jede Dfferentialgleichung innerhalb akzeptabler Zeit löst. Deshalb brauchen wir auf die Problemklassen zugeschnittene Verfahren, welche ihre speziellen Eigenschaften ausnutzen. Wir beschränken uns hier auf elliptische Randwertprobleme. Sie werden zu Integralgleichungen umformuliert, mittels Randelementmethode diskretisiert und damit in ein lineares Gleichungssystem überführt. Zur Behandlung des Gleichungssystems bedienen wir uns Hierarchischer Matrizen. Obwohl diese bereits effektive Hilfsmittel darstellen, wollen wir versuchen ihre Effzienz durch Verwendung gemeinsamer Basen weiter zu steigern. I
24

Competition in the market of health insurance and health care utilization

Wang, Ye 22 February 2018 (has links)
This dissertation examines the determinants of competition and consumer access in the health care market, and supply- and demand-side determinants of health care use under the Affordable Care Act (ACA). The first essay studies insurer entry into the federally-facilitated health insurance market under the ACA. Motivated by the fact that insurers’ service areas can be subsets of rating areas, and the substantial variation in plan composition within a rating area, I explore variations in the type of plans offered and insurers’ decisions to enter a rating area. I find that availability of medical providers, population size, and metropolitan status are important in insurers’ decisions to enter a rating area. Medical cost affects the entry of restricted network plans. The second essay examines how supply-side incentives affect treatment choice for depression. Using claims data from Florida’s Medicaid program, I find large variations in initiating antidepressant treatment among newly diagnosed patients with three plan types: Fee-for-Service (FFS), Primary Care Case Management (PCCMs) and Accountable Care Organizations (ACOs). Compared to FFS, PCCMs and ACOs are more likely to provide antidepressant but no office-based care. I use the control function approach to mitigate the self-selection bias and find that ACOs tend to use lower cost medication options. Despite the use of low-cost alternatives for ACOs, no differences are found in subsequent psychiatric hospitalization or emergency room visits among plans. Different provider contractual relationships may partially explain treatment choice differences. The third essay investigates whether the ACA policy of free preventive services affects utilization of preventive care. I use variation in commercially-insured enrollees to examine the demand and supply prices of four preventive services. Despite an average 53 percentage point decrease in demand prices for these services, the actual service use only increased by 17 percent from 2007 to 2011, possibly due to little or no change in prices paid to providers. Using risk adjustment tools to predict and control for patient underlying health status, I find similar changes in demand prices and rates of service use across six health plan types, consistent with preventive visits being provider rather than consumer choices.
25

Risker då och nu! : - En undersökning om begreppet risk och dess förändring i svenska budgetpropositioner mellan åren 1997-2020 / Risks then and now! : Risks then and now!- A study of the concept of risk and its change in Swedish budget bills between the years 1997-2020.

Lindberg, Jeanette January 2021 (has links)
Trots människors ökade levnadslängd och förbättrade levnadsvillkoren på det stora hela konstateras att upplevda risker och hot dominerar medierapporteringen och den allmänna uppfattningen. Med framväxten av risksamhället och culture of fear som bakgrund syftar denna studie till att undersöka riskbegreppets förändring i de svenska budgetpropositionerna mellan åren 1997-2020. Att genom en kvantitativ ansats få ökad förståelse och diskutera begreppets förekomst, innebörd och eventuella förändring samt i vilket sammanhang det används. Specifikt undersöks förekomsten av begreppet risk och semantiskt liknande begrepp och om frekvensen har förändrats under mätperioden. Därefter undersöks begreppet risk och dess associationer och om dessa har förändrats under de 25 åren. Resultatet visar att användning av begreppet har ökat i antal under mätperioden men inte följer samma skarpa trend som medierapporteringen. Vidare konstateras att begreppet risk fått något annan innebörd och andra associationer över tid.
26

Essays in Health Economics

Lin , Lin January 2019 (has links)
No description available.
27

Stimulus Phoria versus Response Phoria in a Prepresbyopic Population at COSI (Center of Science and Industry)

Pettey, Dix H. 28 May 2015 (has links)
No description available.
28

The Association of Health Care Delivery and Payment Innovations with Avoidable Hospitalizations

Tanenbaum, Joseph Elias 31 August 2018 (has links)
No description available.
29

Étude des interactions protéine-protéine entre le complexe de Survie des MotoNeurones (SMN) et les facteurs d'assemblage des RNP à boîtes C/D et H/ACA / Study of the protein-protein interactions between the SMN complex and the factors required for box C/D and H/ACA RNP assembly

Huttin, Alexandra 11 December 2012 (has links)
Les particules ribonucléoprotéiques (RNP) à boîtes C/D et H/ACA sont impliquées dans la maturation des UsnRNA et des précurseurs des ARNr. L'assemblage de ces RNP dans les cellules est un processus complexe faisant intervenir de nombreux facteurs cellulaires dont NUFIP, commun aux deux RNP, et NAF1, spécifique aux RNP à boîtes H/ACA. Le complexe de Survie des Motoneurones (SMN) est essentiel à la survie cellulaire et est nécessaire à l'assemblage d'une autre RNP, les UsnRNP, composants des spliceosomes. Un déficit en protéine SMN conduit à une pathologie grave, l'amyotrophie spinale. Plusieurs études suggèrent que le complexe SMN puisse également jouer un rôle dans l'assemblage des RNP à boîtes C/D et H/ACA. Dans le but d'obtenir de plus amples informations, nous avons testé si des interactions existent entre les constituants du complexe SMN et i) les protéines associées aux RNP matures, ainsi que ii) les autres facteurs d'assemblage déjà connus. Ainsi, par une approche de double hybride chez la levure, nous avons observé des interactions fortes entre NAF1 et les protéines Gemin3 et Gemin8 du complexe SMN. Comme la protéine coeur GAR1 des RNP à boîte H/ACA interagit avec la protéine SMN, ces données suggèrent que le complexe SMN participe à l'échange de NAF1 par GAR1, qui est une étape clé de la biogenèse des RNP à boîtes H/ACA. De plus, nous avons mis en évidence des interactions entre Gemin3/NUFIP, Gemin4/NUFIP et Gemin6/NUFIP. L'étude de cette dernière interaction a été approfondie. Nous avons montré que l'interaction est directe, qu'elle existe dans les cellules de mammifères à la fois dans le cytoplasme et le noyau, et nous avons défini les domaines de chaque protéine nécessaires à l'interaction, en collaboration avec l'équipe d'E. Bertrand (IGM Montpellier). Ces résultats ouvrent de larges perspectives quant à un lien fonctionnel entre le complexe SMN et NUFIP dans l'assemblage des RNP à boîtes C/D et H/ACA, mais aussi dans l'assemblage de la snRNP U4 et dans le mécanisme de traduction localisée dans les cellules / Box C/D and H/ACA ribonucleoparticles (RNPs) are required for UsnRNA and ribosomal RNA maturation. Their assembly in cells is a complex process, which implicates numerous cellular factors, such as NUFIP, a common assembly factor, and NAF1, which is a specific factor for H/ACA box RNP assembly. The Survival of Motoneurons (SMN) complex is essential for cell survival and is required for the assembly of another class of RNPs, the UsnRNPs, which are essential components of the splicing machinery. Decreased levels of the SMN protein lead to a severe disease, the spinal muscular atrophy. Several studies led to the proposal that the SMN complex also plays a role in the assembly of box C/D and H/ACA RNPs. In order to obtain more information, we analyzed whether some interactions may exist between components of the SMN complex and i) core proteins of mature RNPs, or ii) factors already known to be involved in the assembly. Using a yeast two-hybrid approach, we observed strong interactions between NAF1 and the SMN complex components, Gemin3 and Gemin8. Since the core H/ACA protein GAR1 interacts with the SMN protein, our data suggest that the SMN complex participates to the exchange of NAF1 by GAR1, which is a crucial step of H/ACA box RNP biogenesis. Furthermore, we discovered strong interactions between Gemin3/NUFIP, Gemin4/NUFIP and Gemin6/NUFIP. Concerning the Gemin6/NUFIP interaction, we showed that is direct, that it exists in both compartments in mammalian cells and we defined domains of both proteins necessary for the interaction in collaboration with the E. Bertrand team (IGM Montpellier). These results open new perspectives concerning functional links between the SMN complex and NUFIP in box H/ACA and C/D RNP assembly, but also in U4 snRNP assembly and in the mechanism of localized translation
30

Desempenho aer?bio e controle auton?mico card?aco em idosas praticantes de tai chi chuan e sedent?rias

Fonteles, Andr? Igor 28 February 2013 (has links)
Made available in DSpace on 2014-12-17T14:44:16Z (GMT). No. of bitstreams: 1 AndreIF_DISSERT.pdf: 2389986 bytes, checksum: 01d8b844d40c7ba89fb858795c736fe4 (MD5) Previous issue date: 2013-02-28 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / Os testes de caminhada de 6 minutos (TC6MIN) e 400 metros (TC400M) s?o utilizados como uma alternativa pr?tica e de baixo custo para avaliar a aptid?o aer?bia e o desempenho obtido nesses testes est? relacionado com n?veis de sa?de, capacidade funcional e risco de mortalidade. Al?m do desempenho nos testes, a avalia??o cardiovascular por meio da frequ?ncia card?aca (FC) de recupera??o (FCR) e da variabilidade da frequ?ncia card?aca (VFC) p?s-exerc?cio t?m sido utilizados como informa??o de n?veis de sa?de e risco de mortalidade. O Tai Chi Chuan (TCC) pode aumentar a capacidade aer?bia, al?m de modificar o controle auton?mico. Objetivos: O objetivo foi analisar o desempenho e marcadores auton?micos entre idosas praticantes de TCC e sedent?rias em testes de caminhada indiretos. M?todos: Foram avaliadas 36 idosas, sendo 18 praticantes de TCC, com tempo de pr?tica de pelo menos 6 meses e n?o mais de 1 ano e que realizassem apenas o TCC, e 18 idosas sedent?rias. Para o TC6MIN, os sujeitos seguiram as recomenda??es do protocolo sugerido pela American Thoracic Society (ATS, 2002), e para o TC400M foi utilizado o protocolo do estudo de Simonsick et al.2001. A FCR foi considerada como a diferen?a absoluta entre a FC obtida ao final dos testes, e as FCs medidas no primeiro (FCR60 ) e segundo minuto (FCR120 ). O protocolo de coleta da VFC utilizado foi o recomendado pela Task Force (1996). Ap?s a constata??o da normalidade de distribui??o dos dados mediante teste de Shapiro Wilk, empregou-se o teste t de Student para amostra independentes ou Mann- Whitney caso n?o apresentasse normalidade, coeficiente de correla??o intraclasse (CCI; com 95% de intervalo de confian?a) e Bland- Altman (com 95% dos limites de concord?ncia). Resultados: O desempenho em ambos os grupos apresentou uma boa confiabilidade. As idosas do TCC obtiveram um melhor desempenho nos testes em compara??o com as sedent?rias. Al?m do mais, a FCR apresentou boa confiabilidade na em ambos os grupos, e a FCR das idosas do TCC apresentaram uma melhor reativa??o parassimp?tica quando comparadas com as idosas sedent?rias. Considerando a reprodutibilidade da VFC na an?lise linear e simb?lica, tanto nas idosas praticantes de TCC como nas idosas sedent?rias apresentaram boa confiabilidade. O comportamento da VFC n?o foi significante entre os grupos. Conclus?es: Foi encontrada uma boa confiabilidade no desempenho dos grupos avaliados, e nas vari?veis auton?micas podendo estar associados a intensidade subm?xima atingida em todos os testes. Al?m do mais, o desempenho obtido nos testes podem ser usados na obten??o de medidas confi?veis na avalia??o cardiorrespirat?ria, bem como a utiliza??o da FCR e da VFC parece garantir a confiabilidade dos dados utilizados para para medida do controle auton?mico card?aco. O TCC parece que favorece a um melhor desempenho em testes indiretos, al?m de uma melhor reativa??o parassimpatica considerando a FCR, mas, considerando a VFC n?o foi encontrada diferen?a significante entre as idosas

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