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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

Evaluation quantitative de tissu fibroglandulaire pour l'estimation de l'énergie absorbée différenciée par tissu en tomosynthèse du sein / Quantitative evaluation of fibroglandular tissue for estimation of tissue-differentiated absorbed energy in breast tomosynthesis

Geeraert, Nausikaa 06 October 2014 (has links)
Cette thèse avait deux buts principaux : a) l'implémentation et l'amélioration d'une méthode de calcul de densité volumique du sein (VBD), et b) la proposition d'une mesure d'irradiation utilisable pour l'évaluation du risque individuel en mammographie avec une méthode pour l'estimer. La densité du sein est connue comme indicateur de risque du cancer. Une méthode de quantification objective de la VBD a été développée, à partir d'approches existantes, et améliorée. La méthode a été implémentée pour deux systèmes de mammographie. Elle repose sur l'étalonnage du système de mammographie et la chaîne d'acquisition avec des fantômes équivalents aux tissus mammaires. Une carte de densité est calculée.La contribution majeure de la thèse consiste en une nouvelle méthode de validation, applicable à tout calcul de VBD d'image de mammographie. Elle consiste à comparer les résultats aux valeurs de densité obtenues par des scanners thoraciques pour la même patiente. Cette validation a été appliquée à notre méthode de calcul et nous avons trouvé 10% d'écart moyen entre les deux méthodes, ce qui est comparable aux résultats de l'état de l'art. Pour le risque d'irradiation individuel, nous proposons de remplacer la dose glandulaire moyenne par l'énergie déposée, qui dépend de la quantité et de la distribution du tissu glandulaire, qui est le tissu à risque. L'énergie volumique déposée est calculée par simulation de Monte Carlo. Le VBD, calculé pour l'image de projection à 0° en tomosynthèse, aide à localiser le tissu glandulaire et à attribuer l'énergie déposée dans les tissus différents. Une proposition a été faite pour des fantômes géométriques, un fantôme texturé et un cas de patiente / In this research project the main goals were a) to implement a method for the computation of the volumetric breast density (VBD), and b) to propose an improved quantity for the assessment of individual radiation-induced risk, in particular during mammography, together with a method to quantify it. The breast density is known as a breast cancer risk factor. The objective quantification of the volumetric breast density was developed, based on already published methods, and improved. The method was implemented for two mammography systems. It is based on the calibration of the mammography system acquisition chain with breast equivalent phantoms and computes a breast density map. Our most important contribution resides in a new validation method applicable to any VBD computation, consisting in comparing its results with the VBD obtained from a thorax CT examination for the same patient. This validation method was applied to our VBD computation. We found an average deviation between mammography and CT of less than 10%. Our results are comparable to the state-of-the-art results for other validation methods. For the individual radiation risk, we proposed to replace the average glandular dose by the imparted energy, which depends on the quantity and distribution of the glandular tissue, which is the tissue at risk. The volumetric imparted energy is computed from Monte Carlo simulations. The VBD, computed for the 0° projection of tomosynthesis exams, helps us to localize the glandular tissue and to attribute the imparted energy to the different tissues. A proposition was implemented for geometric phantoms, a textured phantom and a patient case.
22

Effects of two alfalfa preparations with different particle sizes on the gastric mucosa in weanlings

Vondran, Sarah, Venner, Monica, Vervuert, Ingrid 21 June 2016 (has links) (PDF)
Background: Feeding alfalfa hay is often recommended for its buffering components, like protein and calcium, to prevent lesions of the gastric mucosa in horses. Until now, there has been no information regarding the influence of alfalfa particle size on the gastric mucosa. The aim of this study was to investigate the effects of feeding two alfalfa preparations with different particle sizes (alfalfa chaff vs alfalfa pellets) in comparison with grass hay on the gastric mucosa in weanling horses. We hypothesized that feeding a high proportion of fine alfalfa particles would negatively impact gastric mucosa and that feeding long alfalfa chaff would improve gastric mucosal health in weanlings. Results: Before weaning, the prevalence of gastric mucosa lesions (one or more lesions considering all locations in the stomach) was 84.3 %; at 14 days after weaning, it was almost 100 %. Before and after weaning, most of the lesions were found at the greater curvature of the squamous mucosa and at the lesser curvature. After weaning, gastric mucosal lesions at the pylorus were significantly more severe in the group fed alfalfa chaff (p = 0.002). In the other regions, no differences related to the feeding regimes were observed. Conclusions: Feeding alfalfa failed to improve gastric mucosal lesion scores in weanlings. Furthermore, foals fed alfalfa chaff had higher lesion scores at the pylorus. Alfalfa leaves contain a superior protein source and high amounts of calcium and magnesium, providing extra nutritional advantages in growing horses. At this time, either traditional grass hay rations or grass hay with alfalfa pellets can be recommended.
23

Queilite glandular: estudo de 22 casos com análise clínico-patológica e da expressão das aquaporinas / Cheilitis glandularis: clinicopathological study of 22 patients and analysis of aquaporins expression

Melo, Juliana Nakano de 26 August 2011 (has links)
Introdução: A queilite glandular (QG) é uma doença inflamatória rara, de causa desconhecida, que afeta as glândulas salivares menores, principalmente do lábio inferior. Há secreção de saliva espessa através das glândulas salivares alteradas, causando desconforto ao doente. O quadro clínico consiste em graus variáveis de macroqueilia, acompanhada pela presença de ostíolos dilatados de glândulas salivares menores no vermilião. À expressão, há saída de material espesso e mucóide, que geralmente adere ao lábio acometido. A palpação cuidadosa pode revelar a presença de áreas nodulares endurecidas, que raramente podem supurar e drenar material purulento. O lábio inferior é o mais frequentemente acometido, e a doença tende a ser crônica e de difícil manejo. As opções terapêuticas incluem uso de corticóides tópicos ou intralesionais, antibioticoterapia oral, fotoproteção e cirurgia. A queilite glandular é considerada por alguns autores como uma condição pré-maligna, com alguns relatos de desenvolvimento de carcinoma epidermóide no lábio acometido. Aquaporinas são proteínas transmembrana que possuem a capacidade de transportar água entre os meios extra e intracelular. Desempenham, dessa maneira, papel importante na homeostase corporal. São proteínas amplamente distribuídas pelos tecidos humanos, existindo mais publicações sobre sua importância na fisiopatologia renal e do sistema nervoso central, até o momento. Os estudos sobre o papel das aquaporinas nas glândulas salivares são escassos, muitos realizados apenas em animais, não em humanos. Na queilite glandular, há alteração clínica evidente da viscosidade da saliva, o que é uma das queixas mais importantes. A alteração da expressão das aquaporinas na queilite glandular poderia corroborar o achado clínico-patológico de composição da saliva nesses doentes. Objetivos: Apresentar os achados clínicos e histopatológicos de 22 doentes com diagnóstico de queilite glandular, revisar os aspectos histopatológicos, assim como as terapias utilizadas e estudar a expressão das aquaporinas nas glândulas salivares menores labiais dos doentes em relação a controles de glândulas normais. Método: Foram analisados 22 doentes com diagnóstico de QG, acompanhados no Ambulatório de Estomatologia da Divisão de Dermatologia do HCFMUSP. Todos foram avaliados quanto aos dados clínicos e demográficos. Dez dos 22 doentes foram submetidos a tratamento cirúrgico, que consistiu na vermilionectomia do lábio inferior, seguida da dissecção das glândulas salivares menores, sendo o material analisado histopatologicamente. Em sete doentes foi realizada a análise da expressão das aquaporinas nas glândulas salivares menores labiais, comparando-os a glândulas salivares normais, através da técnica de imuno-histoquímica. Resultados: Os achados clínicos e histopatológicos evidenciaram maior prevalência de QG em indivíduos de pele clara. Observaram-se graus variáveis de sialadenite crônica e alterações epiteliais nos doentes submetidos a biopsias ou a tratamento cirúrgico. Dos 22 doentes, 3 apresentaram focos de carcinoma epidermóide no lábio inferior. A análise da expressão das aquaporinas nas glândulas salivares menores labiais mostrou positividade para AQP1, AQP2, AQP4, AQP5 e AQP8, em intensidades e localizações diversas em relação aos casos controles. Conclusões: Na queilite glandular, há aumento da chance de desenvolvimento de carcinoma epidermóide do lábio. A doença parece ter origem tanto a partir de causas exógenas, como a exposição aos raios ultravioleta, como causas endógenas, fato sugerido pelo encontro de alteração na expressão das aquaporinas nas glândulas salivares menores labiais dos doentes. Na literatura, algumas aquaporinas ainda não haviam sido detectadas por imuno-histoquímica na glândula salivar menor labial humana / Background: Cheilitis glandularis (CG) is a condition of unknown cause which thick saliva is secreted from swollen minor salivary glands from the lips. The condition is considered rare; there are few published case series, and most reports refer to single cases. The clinical picture of CG consists of variable degrees of macrocheilia accompanied by the presence of red, dilated ostia of minor salivary glands on the vermilion area. A thick, mucoid material can be obtained from these ostia by manual expression. This viscous saliva often sticks to the vermilion causing discomfort to the patient. Changes occur more frequently on the lower lip. The condition tends to be chronic and difficult to manage. Treatments vary from topical or intra lesional steroids, oral antibiotics, sun protection and surgery. Cheilitis glandularis is frequently regarded as a \"premalignant\" condition, with a few reported cases of development of squamous cell carcinoma. Aquaporins are small membrane proteins that exhibit channel activity specific for water and small solutes. They are considered essencial for corporal homeostasis, and are widely expressed through human tissues. Until now, most aquaporins studies are based on renal and nervous system fisiopathology, with few studies on situations involving salivary glands, such as Sjögrens disease. Some of them are performed over murine models, not human salivary glands. Objectives: In cheilitis glandularis, there is clinical evidence of thick saliva, which is one of the biggest complains of affected patients. We have diagnosed CG at our Oral Diseases Clinic in what seems to be a higher frequency than usually reported. This has prompted us to study these patients and present our results. Most CG reports are about isolated cases. We performed immunohistochemistry analysis to indicate aquaporins expression in human minor salivary glands affected by CG, since there is clinically thick saliva and its production is related to the activity of aquaporin channels. Methods: Data from 22 patients with diagnosis of cheilitis glandularis, from Oral Diseases Clinic of HC-FMUSP, were reviewed. Ten of 22 patients were submitted to surgical treatment, which was the surgical removal of the lower lip. We performed, on seven patients, analysis of aquaporins expression in minor labial salivary glands, in comparison to healthy tissues, through immunohistochemistry studies. RESULTS: Clinical findings showed higher prevalence of CG on fair skinned patients. Histopathological exams revealed variable degrees of chronic sialoadenitis and epithelial changes in patients submitted to surgical treatment or biopsy. Three of them have developed epidermoid carcinoma of lower lip. Analysis of aquaporins expression showed positivity for AQP1, AQP2, AQP4, AQP5 e AQP8, that differs from normal minor labial salivary glands. Conclusions: In CG, the chance of develop labial epidermoid carcinoma is increased. It seems that exogenous and endogenous components are related to the etiology of CG, as we found different expression of aquaporins in affected glands
24

Queilite glandular: estudo de 22 casos com análise clínico-patológica e da expressão das aquaporinas / Cheilitis glandularis: clinicopathological study of 22 patients and analysis of aquaporins expression

Juliana Nakano de Melo 26 August 2011 (has links)
Introdução: A queilite glandular (QG) é uma doença inflamatória rara, de causa desconhecida, que afeta as glândulas salivares menores, principalmente do lábio inferior. Há secreção de saliva espessa através das glândulas salivares alteradas, causando desconforto ao doente. O quadro clínico consiste em graus variáveis de macroqueilia, acompanhada pela presença de ostíolos dilatados de glândulas salivares menores no vermilião. À expressão, há saída de material espesso e mucóide, que geralmente adere ao lábio acometido. A palpação cuidadosa pode revelar a presença de áreas nodulares endurecidas, que raramente podem supurar e drenar material purulento. O lábio inferior é o mais frequentemente acometido, e a doença tende a ser crônica e de difícil manejo. As opções terapêuticas incluem uso de corticóides tópicos ou intralesionais, antibioticoterapia oral, fotoproteção e cirurgia. A queilite glandular é considerada por alguns autores como uma condição pré-maligna, com alguns relatos de desenvolvimento de carcinoma epidermóide no lábio acometido. Aquaporinas são proteínas transmembrana que possuem a capacidade de transportar água entre os meios extra e intracelular. Desempenham, dessa maneira, papel importante na homeostase corporal. São proteínas amplamente distribuídas pelos tecidos humanos, existindo mais publicações sobre sua importância na fisiopatologia renal e do sistema nervoso central, até o momento. Os estudos sobre o papel das aquaporinas nas glândulas salivares são escassos, muitos realizados apenas em animais, não em humanos. Na queilite glandular, há alteração clínica evidente da viscosidade da saliva, o que é uma das queixas mais importantes. A alteração da expressão das aquaporinas na queilite glandular poderia corroborar o achado clínico-patológico de composição da saliva nesses doentes. Objetivos: Apresentar os achados clínicos e histopatológicos de 22 doentes com diagnóstico de queilite glandular, revisar os aspectos histopatológicos, assim como as terapias utilizadas e estudar a expressão das aquaporinas nas glândulas salivares menores labiais dos doentes em relação a controles de glândulas normais. Método: Foram analisados 22 doentes com diagnóstico de QG, acompanhados no Ambulatório de Estomatologia da Divisão de Dermatologia do HCFMUSP. Todos foram avaliados quanto aos dados clínicos e demográficos. Dez dos 22 doentes foram submetidos a tratamento cirúrgico, que consistiu na vermilionectomia do lábio inferior, seguida da dissecção das glândulas salivares menores, sendo o material analisado histopatologicamente. Em sete doentes foi realizada a análise da expressão das aquaporinas nas glândulas salivares menores labiais, comparando-os a glândulas salivares normais, através da técnica de imuno-histoquímica. Resultados: Os achados clínicos e histopatológicos evidenciaram maior prevalência de QG em indivíduos de pele clara. Observaram-se graus variáveis de sialadenite crônica e alterações epiteliais nos doentes submetidos a biopsias ou a tratamento cirúrgico. Dos 22 doentes, 3 apresentaram focos de carcinoma epidermóide no lábio inferior. A análise da expressão das aquaporinas nas glândulas salivares menores labiais mostrou positividade para AQP1, AQP2, AQP4, AQP5 e AQP8, em intensidades e localizações diversas em relação aos casos controles. Conclusões: Na queilite glandular, há aumento da chance de desenvolvimento de carcinoma epidermóide do lábio. A doença parece ter origem tanto a partir de causas exógenas, como a exposição aos raios ultravioleta, como causas endógenas, fato sugerido pelo encontro de alteração na expressão das aquaporinas nas glândulas salivares menores labiais dos doentes. Na literatura, algumas aquaporinas ainda não haviam sido detectadas por imuno-histoquímica na glândula salivar menor labial humana / Background: Cheilitis glandularis (CG) is a condition of unknown cause which thick saliva is secreted from swollen minor salivary glands from the lips. The condition is considered rare; there are few published case series, and most reports refer to single cases. The clinical picture of CG consists of variable degrees of macrocheilia accompanied by the presence of red, dilated ostia of minor salivary glands on the vermilion area. A thick, mucoid material can be obtained from these ostia by manual expression. This viscous saliva often sticks to the vermilion causing discomfort to the patient. Changes occur more frequently on the lower lip. The condition tends to be chronic and difficult to manage. Treatments vary from topical or intra lesional steroids, oral antibiotics, sun protection and surgery. Cheilitis glandularis is frequently regarded as a \"premalignant\" condition, with a few reported cases of development of squamous cell carcinoma. Aquaporins are small membrane proteins that exhibit channel activity specific for water and small solutes. They are considered essencial for corporal homeostasis, and are widely expressed through human tissues. Until now, most aquaporins studies are based on renal and nervous system fisiopathology, with few studies on situations involving salivary glands, such as Sjögrens disease. Some of them are performed over murine models, not human salivary glands. Objectives: In cheilitis glandularis, there is clinical evidence of thick saliva, which is one of the biggest complains of affected patients. We have diagnosed CG at our Oral Diseases Clinic in what seems to be a higher frequency than usually reported. This has prompted us to study these patients and present our results. Most CG reports are about isolated cases. We performed immunohistochemistry analysis to indicate aquaporins expression in human minor salivary glands affected by CG, since there is clinically thick saliva and its production is related to the activity of aquaporin channels. Methods: Data from 22 patients with diagnosis of cheilitis glandularis, from Oral Diseases Clinic of HC-FMUSP, were reviewed. Ten of 22 patients were submitted to surgical treatment, which was the surgical removal of the lower lip. We performed, on seven patients, analysis of aquaporins expression in minor labial salivary glands, in comparison to healthy tissues, through immunohistochemistry studies. RESULTS: Clinical findings showed higher prevalence of CG on fair skinned patients. Histopathological exams revealed variable degrees of chronic sialoadenitis and epithelial changes in patients submitted to surgical treatment or biopsy. Three of them have developed epidermoid carcinoma of lower lip. Analysis of aquaporins expression showed positivity for AQP1, AQP2, AQP4, AQP5 e AQP8, that differs from normal minor labial salivary glands. Conclusions: In CG, the chance of develop labial epidermoid carcinoma is increased. It seems that exogenous and endogenous components are related to the etiology of CG, as we found different expression of aquaporins in affected glands
25

The Optimization of the Nuclear Protein in Testis (NUT) Antibody and its Importance and Impact in the Pathology Lab

Martinez, Lindsey 03 April 2017 (has links)
Optimization in immunohistochemistry is often a time consuming and complex process. There are a varying array of moving parts to consider all while preserving the sensitivity and specificity of the test. When optimizing an antibody it is important to consider the fixation of the tissue and the type of epitope retrieval that would be best suited for the test. The dilution of the primary antibody is a key marker for the efficiency and effectiveness of the laboratory protocol. The purpose of this study was to produce an optimized antibody for the nuclear protein in testis to detect NUT midline carcinoma that provides a sensitive and specific test but is also efficient and can be useful for everyday pathological dedications. The midline carcinoma defined by the translocation of the NUT gene on chromosome 15q14 that bonds with BRD4 or BRD3 commonly known as NUT midline carcinoma (NMC) is a rapidly aggressive and fatal disease. Commonly a fluorescent in situ hybridization (FISH) test is used to diagnosis this carcinoma. This test takes longer than traditional IHC and can delay the treatment of the patient. Therefore this is why, irrespective of the levels of tumor markers, immunohistochemistry for the NUT marker should be performed in any case where there is poorly differentiated carcinomas that do not have glandular differentiation that come from midline structures.
26

An Examination of Possible Carnivory in Silene regia, a Member of the Caryophyllaceae

Dienno, Garrett John 31 July 2017 (has links)
No description available.
27

Combined Roles of Glandular-haired Alfalfa and Natural Enemies in Alfalfa Pest Managment in Virginia

Dellinger, Theresa Ann 16 October 2003 (has links)
Both alfalfa weevil, <i>Hypera postica</i> (Gyllenhal), (Coleoptera: Curculionidae), and potato leafhopper, <i>Empoasca fabae</i> (Harris), (Homoptera: Cicadellidae), remain key pests of alfalfa in Virginia. Commercial varieties of potato leafhopper-resistant (or glandular-haired) alfalfa were released in the mid-1990s, but the impact of alfalfa weevil on these varieties has not been well documented. In 1999, two large-scale field experiments were initiated to compare the performance of a glandular-haired alfalfa variety against a standard, non-glandular-haired variety under both alfalfa weevil and potato leafhopper pest pressures in the southwestern and Piedmont regions of Virginia over a 3 year period. Results indicated that alfalfa weevil must be managed in potato leafhopper-resistant alfalfa to limit crop loss. Surprisingly, similar densities of potato leafhoppers were found in both the glandular-haired and standard varieties. Both varieties frequently had similar yields and forage quality. In general, the glandular-haired variety did not outperform the standard variety. Results also indicated that insecticide application did not always provide the expected benefits of higher yields and forage quality, despite reducing pest densities for 2-3 weeks after application. These data suggest that the economic thresholds for one or both of these pests in Virginia may require adjustment. The potential impact of glandular-haired alfalfa on the natural enemies of alfalfa weevil was examined as well. <i>Bathyplectes anurus</i> (Thompson) (Hymenoptera: Ichneumonidae) was the dominant parasitoid attacking weevil larvae at both locations. Parasitization of weevil larvae by <i>Bathyplectes</i> spp. did not appear to be adversely affected by the presence of glandular trichomes on the potato leafhopper-resistant variety. Glandular trichomes had little impact on the infection of weevil larvae by the fungus <i>Zoophthora phytonomi</i> as well, but this was not unexpected. The genetic variation of <i>B. anurus</i> was surveyed at both study sites using RAPD-PCR to establish or eliminate the possibility that differences in parasitization levels between the Piedmont and southwestern regions could be attributed to the presence of different parasitoid strains. Most of the detected phenotypic variation was attributed to within population variation, with very little variation occurring between the two populations. However, the between population variation was statistically significant in 2000, but not in 2001. / Ph. D.
28

Express?o imuno-histoqu?mica da calponina em gl?ndula par?tida de rato ap?s obstru??o do ducto excretor principal

Miguel, M?rcia Cristina da Costa 19 May 2006 (has links)
Made available in DSpace on 2014-12-17T15:32:17Z (GMT). No. of bitstreams: 1 MarciaCCN.pdf: 387769 bytes, checksum: 0a9e8612244642f4c9e83714144b0e02 (MD5) Previous issue date: 2006-05-19 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / Glandular atrophy is one of several alterations which can aflict the salivary glands, caused generally by obstructive lesions such as sialo1ithiasis, infections or compression by neoplastic processes arnong others. In this work, a morphological and immunohistochemical study was carried out in rat parotid glands, which were submitted to obstruction of the main excretory duct suffering atrophy at varied time intervals, with the aim of appraising the behavior of myoepithelial cells during the process of glandular atrophy. It was analized the immunohistochemical expression of calponin which detects myoepithelial cells in the parotids of 28 animaIs, which were divided into 7 groups, each one made up of 4 rats, afier the ductal ligature procedure, in the following time intervals: zero hour (control), 24 hours, 7, 15, 21, 30 and 60 days. Analysis of the immunohistochemicaI profile was carried through in which the calponin expression was veritied through its distribution pattem and numericaI index. All specimens exhibited positivity for calponin in myoepithelial cells which were distributed around the acini and the ductaI structures, a small number of positiveIy marked cells being detected in the controI group and in the 24-hour group when compared to subsequent ones, where it was perceived a Iarge increase in the number of positiveIy marked cens, mainly surrounding the ductiform structures which originated during the obstruction time. Upon application of statistical tests it was verified that the rise in the number the myoepithelial positive cells for calponin, when the control groups (zero hour) was compared to the 7, 15,21, 30 and 60-day groups afier obstruction, was statistica1ly significant. It was concluded then that the detected rise probably carne about due to an elevation in the rate of proliferation of the myoepitheliaI cells subsequent to the ductal obstruction, associated with a growing resistance of these cells to glandular atrophy. / A atrofia glandular ? uma das diversas altera??es que podem acometer as gl?ndulas salivares,causada geralmente por les?es obstrutivas como sialolit?ase,infec??es ou compress?o por processos neopl?sicos,dentre outros.No presente trabalho realizou-se estudo morfol?gico e imuno-histoqu?mico em gl?ndulas par?tidas de ratos submetidos ? obstru??o do ducto excretor principal,sofrendo atrofia em intervalos variados de tempo,visando avaliar o comportamento das c?lulas mioepiteliais durante o processo de atrofia glandular.Analisou-se a express?o imuno-histoqu?mica da calponina,a qual detecta c?lulas mioepiteliais,nas par?tidas de 28 animais divididos em 7 grupos com 4 ratos cada,ap?s o procedimento de ligadura ductal nos seguintes intervalos de tempo:zerohora(controle),24 horas,7,15,21,30 e 60 dias.Procedeu-se a an?lise do perfil imuno-histoqu?mico,onde verificou-se a express?o da calponina atrav?s de seu padr?o de distribui??o e ?ndice num?rico.Todos os esp?cimes exibiram positividade para a calponina nas c?lulas mioepiteliais,as quais se distribu?ram em torno dos ?cidos e estruturas ductais,sendo detectadas poucas c?lulas marcadas positivamente no grupo controle e no de 24 horas quando comparados aos grupos subsequentes,onde percebeu-se um grande aumento no n?mero de c?lulas marcadas positivamente,principlamente circundando as estruturas ductifformes que surgiram com o decorrer do tempo de obstru??o.Aplicados testes estat?sticos,foi verificado que o aumento no n?mero de c?lulas mioepiteliais positivas para a calponina,quando comparados o grupo controle(zero hora) com os grupos de 7,15,21,30 e 60 dias ap?s obstru??o,foi estatisticamente significativo.Concluiu-se que este aumento detectado,provavelmente ocorreu devido a uma eleva??o na taxa de prolifera??o das c?lulas mioepiteliais subsequente ? obstru??o ductal,associado a uma maior resist?ncia destas c?lulas ? arofia glandular.
29

Contribuições aos estudos anatômicos de Bromeliaceae (Poales) sob uma perspectiva filogenética / Contribution to the anatomical studies of Bromeliaceae (Poales) under a phylogenetic perspective

Oliveira, Fernanda Maria Cordeiro de 17 March 2017 (has links)
Bromeliaceae ocupa posição basal na Ordem Poales e é considerada monofilética, tendo sinapomorfias morfológicas e moleculares. Atualmente é subdividida em oito subfamílias, sendo Bromelioideae a subfamília com maiores problemas na delimitação genérica. Nesse contexto encontra-se o Complexo Nidularióide, formado pelos gêneros Nidularium Lem., Wittrockia Lindm., Neoregelia L.B.Sm., Canistropsis (Mez) Leme e Edmundoa Leme. A dificuldade na delimitação destes gêneros se dá pelo uso de um grande número de caracteres não exclusivos, que mostram o íntimo relacionamento entre estes gêneros. Embora estes gêneros não sejam monofiléticos, como indicam as filogenias recentes, o Complexo Nidularióide como um todo sempre emerge em um clado, indicando que formam uma unidade taxonômica. Neste contexto, analisamos caracteres morfológicos e anatômicos a fim de estabelecer novas sinapomorfias para o Complexo. Nossos resultados indicam que os principais caracteres morfológicos utilizados na delimitação dos gêneros do complexo Nidularióide são homoplásticos. A maior parte dos caracteres anatômicos também representam homoplasias. No entanto a anatomia foliar mostrou-se útil, provendo novas sinapomorfias para o grupo, tais como a presença de células da ala alongadas nos tricomas, e presença de células epidérmicas adaxiais com paredes levemente espessadas na lâmina foliar. No segundo capítulo, analisamos a anatomia floral de 16 espécies de Bromeliaceae, pertencente a três das oito subfamílias, a fim de estabelecer caracteres anatômicos florais úteis na sistemática do grupo, bem como discuti-los sob uma perspectiva ecológica e filogenética. Uma nova sinapomorfia é proposta para Pitcairnoideae a partir de dados sobre a vascularização do gineceu. No terceiro capítulo, analisamos o desenvolvimento foliar de três espécies de Tillandsia L. (Tillandsoideae). Neste estudo, foi possível registrar a presença de coléteres nas bainhas foliares próximas aos ápices caulinares de T. tricholepis (L.) L. Estas estruturas são responsáveis pela proteção do meristema apical caulinar (MAC) por meio de seu exsudado. Este estudo é o primeiro registro destas estruturas em Bromeliaceae / Bromeliaceae ocupies a basal position in Poales Order and is considered monophyletic by morphological and molecular sinapomorphies. The family is currently subdivided into eight subfamilies. Bromelioideae has major problems in generic delimitation. In this context is included Nidularioid Complex, formed by the genera Nidularium Lem., Wittrockia Lindm., Neoregelia L.B.Sm., Canistropsis (Mez) Leme e Edmundoa Leme. The difficulty to generic delimitation in these genera occurs by the presence of a great number of non-exclusive character, which demonstrates their intimate relashioship. Although recent phylogenies indicate these genera are not monophyletic, Nidularioid Complex always emerges as a clade, which suggests they are a true taxonomic entity. In this context, we analyzed morphological and anatomical characters to establish new sinapomorphies for the Complex. Our results indicates that the main morphological characters used in genera delimitation on Nidularioid Complex are homoplastic. The major part of anatomical characters are also homoplastic. However, leaf anatomy shows to be useful, providing new synapomorphies for this group, such as the presence of trichomes with elongated wing\'s cells and the presence of adaxial epidermal cells with lightly thickened walls on leaf blade. On the second chapter, we analyzed floral anatomy of 16 species of Bromeliaceae, belonging to three out of eight subfamilies, to establish anatomical floral characters useful in the group sistematics, as well as discuss it under an ecological and phylogenetic perspective. A new synapomorphy for Pitcairnoideae is established, by data of gynoicea vascularization. On the third chapter, we analyzed leaf development of three species of Tillandisia L. (Tillandsoideae). In this study, it was possible to describe the presence of colleters in leaf sheath, next to shoot apices of T. tricholepis (L.) L. These structures are responsible by shoot apical meristem\'s (SAM) protection by their secretion. This is the first record of colleters in Bromeliaceae
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Deletion mapping of human 3P in major epithelial malignancies and fine localization of candidate tumor suppressor genes /

Liu, Jian, January 2003 (has links)
Diss. (sammanfattning) Stockholm : Karol. inst., 2003. / Härtill 5 uppsatser.

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