Made available in DSpace on 2014-12-17T15:36:53Z (GMT). No. of bitstreams: 1 RuthnaldoRML.pdf: 3880208 bytes, checksum: 7da0684594a4d62a80785416490983fa (MD5) Previous issue date: 2008-04-30 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / In rodents, the suprachiasmatic nucleus (SCN) and the intergeniculate leaflet (IGL) are the main components of the circadian system. The SCN is considerate the site of an endogenous biological clock because can to generate rhythm and to synchronize to the environmental cues (zeitgebers) and IGL has been related as one of the main areas that modulate the action of SCN. Both receive projections of ganglion cells of retina and this projection to SCN is called retinohypothalamic tract (RHT). Moreover, the IGL is connected with SCN through of geniculohypothalamic tract (GHT). In primates (include humans) was not still demonstrated the presence of a homologous structure to the IGL. It is believed that the pregeniculate nucleus (PGN) can be the answer, but nothing it was still proven. Trying to answer that question, the objective of our study is to do a comparative analysis among PGN and IGL through of techniques immunohystochemicals, neural tracers and FOS expression after dark pulses. For this, we used as experimental model a primate of the new world, the common marmoset (Callithrix jacchus). Ours results may contribute to the elucidation of this lacuna in the circadian system once that the IGL is responsible for the transmission of nonphotic information to SCN and participate in the integration between photic and nonphotic stimulus to adjust the function of the SCN. In this way to find a same structure in primates represent an important achieve in the understanding of the biological rhythms in those animals / O sistema de temporiza??o circadiana (STC) ? respons?vel pela gera??o e modula??o dos ritmos circadianos que s?o oscila??es end?genas manifestadas pelos seres vivos para a maioria das fun??es e comportamentos, com per?odo em torno de 24 horas. Estes ritmos s?o sincronizados principalmente ao ciclo claro-escuro di?rio. O STC ? constitu?do por um conjunto de estruturas neurais interligadas, incluindo na sua composi??o um marca-passo encarregado da gera??o do ritmo, vias sincronizadoras e de sa?da aos efetores comportamentais. O n?cleo supraquiasm?tico do hipot?lamo (NSQ) ? tido como principal marcapasso circadiano. A les?o desse conjunto de c?lulas deixa o animal arr?tmico para algumas fun??es circadianas. A principal via direta de sincroniza??o ? o tracto retinohipotal?mico (TRH), que leva informa??o f?tica ambiental da retina ao NSQ. Uma segunda via, tida como de sincroniza??o indireta para o NSQ, ? o tracto gen?culohipotal?mico (TGH), que se origina das c?lulas produtoras de neuropept?deo Y (NPY) do folheto intergeniculado (FIG) do complexo geniculado lateral do t?lamo de roedores. Essas c?lulas tamb?m recebem proje??o direta da retina. Em primatas essa estrutura ainda n?o foi identificada. No entanto, um conjunto de c?lulas medial ao n?cleo geniculado lateral dorsal (GLD) do t?lamo, denominado de n?cleo pr?geniculado (NPG), se apresenta como poss?vel estrutura hom?loga ao FIG dos roedores, j? que algumas c?lulas do NPG apresentam imunorreatividade ao anticorpo contra NPY em diversos primatas estudados. Sabe-se que o sistema FIG-TGH al?m de estar relacionado ? modula??o f?tica do NSQ, parece tamb?m estar fortemente envolvido na sincroniza??o n?o-f?tica desse sistema. Ainda, as c?lulas imunorreativas a NPY est?o claramente mais envolvidas na sincroniza??o n?o-f?tica, comprovado pela marca??o da atividade metab?lica envolvendo o gene c-fos (gene de express?o imediata). Considerando este aspecto funcional e a dificuldade de identificar com precis?o uma estrutura hom?loga ao FIG em primatas, realizamos a caracteriza??o neuroqu?mica, analisamos o padr?o da proje??o retiniana e a express?o da prote?na do gene c-fos ap?s pulso de escuro, para melhor definir o papel do NPG dentro do STC. Para isso, usamos como modelo experimental um primata do novo mundo, o Callitrhix jacchus, conhecido popularmente como sag?i. Nossos dados confirmaram a hip?tese inicial de que o NPG, ou parte dele, seria hom?logo ao FIG de roedores. Encontramos, em toda extens?o do NPG do sag?i, neur?nios imunorreativos a NPY e uma densa proje??o retiniana em uma regi?o localizada mais pr?xima ao GLD. Conclu?mos que esta ?rea situada mais internamente, em rela??o ao complexo geniculado lateral do t?lamo, corresponde ao FIG e a por??o mais externa ao n?cleo geniculado lateral ventral dos roedores

Submitted by Jos? Henrique Henrique (jose.neves@ufvjm.edu.br) on 2018-07-30T19:24:15Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) ana_paula_campos_barbosa_silva.pdf: 1261920 bytes, checksum: 745fbfc83a27d78f80dd346ad35d219a (MD5) / Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2018-10-05T19:09:52Z (GMT) No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) ana_paula_campos_barbosa_silva.pdf: 1261920 bytes, checksum: 745fbfc83a27d78f80dd346ad35d219a (MD5) / Made available in DSpace on 2018-10-05T19:09:52Z (GMT). No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) ana_paula_campos_barbosa_silva.pdf: 1261920 bytes, checksum: 745fbfc83a27d78f80dd346ad35d219a (MD5) Previous issue date: 2017 / O N?cleo de Apoio ? Sa?de da Fam?lia (NASF) foi criado com o objetivo de ampliar as a??es das Estrat?gias de Sa?de da Fam?lia (ESF), atuando de forma interdisciplinar alicer?ado primordialmente no apoio matricial. Por?m, observa-se uma fragilidade na incorpora??o dessa ferramenta no processo de trabalho das equipes da ESF e do NASF do munic?pio de Itamarandiba ? MG. Nesse contexto, a identifica??o das representa??es sociais dos profissionais da Aten??o Prim?ria ? Sa?de (APS) sobre assist?ncia ? sa?de visou ? compreens?o do impacto das mesmas na operacionaliza??o do apoio matricial exercido pelo NASF do munic?pio em quest?o. Para isso, este estudo recorreu ao desenho metodol?gico de estudo de caso, com natureza explorat?ria e abordagem qualitativa. Para o alcance dos dados usou-se an?lise documental, entrevistas semiestruturadas e observa??o do campo. Participaram como sujeitos deste estudo: dois m?dicos, dois enfermeiros, um cirurgi?o dentista, um auxiliar de sa?de bucal, dois Agentes Comunit?rios de Sa?de (ACS), dois t?cnicos em enfermagem, e os tr?s profissionais do NASF, perfazendo um total de treze profissionais, todos pertencentes ? rede de APS do munic?pio de Itamarandiba. O corpus primeiramente foi submetido ? an?lise pelo software IRAMUTEQ (Interface de R pourles Analyses Multidimensionnelles de Textes et de Questionnaires), atrav?s da Classifica??o Hier?rquica Descendente (CHD), com o objetivo de verificar as classes de palavras e sua organiza??o. Na sequ?ncia, submeteu-se o corpus ? an?lise tem?tico-categorial evidenciando os temas ?Assist?ncia? e ?Pr?ticas profissionais?. Como resultados deste estudo, verificou-se a presen?a de conceitos de assist?ncia ? APS tanto convergentes como divergentes com as diretrizes do SUS e normativas ministeriais da APS, j? as pr?ticas revelaram que, em sua maioria, afastavam-se do modelo de promo??o da sa?de, demonstrando, pois, representa??es sociais ancoradas no modelo biom?dico. Al?m disso, a investiga??o dos processos hist?ricos e culturais de organiza??o da APS, em especial do NASF, em Itamarandiba, esclareceu o contexto de produ??o das representa??es sociais, permitindo a compreens?o do quanto o mesmo favorece ? perman?ncia de condutas ancoradas em um modelo de assist?ncia verticalizado, com pr?ticas fragmentadas e isoladas que dificultam a intersetorialidade e se afastam da compreens?o do instrumento apoio matricial. Percebe-se a exist?ncia de pr?ticas pautadas no modelo de promo??o da sa?de, mas que precisam ser fortalecidas. Espera-se que este trabalho fomente reflex?es, entre os profissionais das equipes da APS, os coordenadores e gestores de Itamarandiba, de modo a problematizar o quanto o processo de trabalho e a organiza??o das a??es e servi?os de sa?de do munic?pio precisam ser reavaliados e reconfigurados, visando ao fortalecimento da APS. Com isso, viabilizar a atua??o do NASF em parceria com as equipes de ESF, sob a l?gica do apoio matricial e equipes de refer?ncia, visando ? organiza??o do sistema municipal de sa?de, e, consequentemente, a melhoria da qualidade de vida dos usu?rios. / Disserta??o (Mestrado) ? Programa de P?s-gradua??o em Ensino em Sa?de, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2017. / The Family Health Support Center (NASF) was created with the aim of expanding the actions of the Family Health Strategies (ESF), acting in an interdisciplinary way based primarily on the support of the matrix. However, there is a weakness in the incorporation of this tool in the work process of the ESF and NASF teams of the municipality of Itamarandiba - MG. In this context, the identification of the social representations of Primary Health Care (APS) professionals on health care aimed at understanding the impact of these on the operationalization of the matrix support exercised by the NASF of the municipality in question. For this, this study used the methodological design of case study, with exploratory nature and qualitative approach. For data coverage, we used document analysis, semi-structured interviews and field observation. Two physicians, two nurses, one dental surgeon, one oral health assistant, two community health agents (ACS), two nursing technicians, and the three NASF professionals, comprising a total of thirteen professionals, all belonging to the APS network of the municipality of Itamarandiba. The corpus was first submitted to analysis by the software IRAMUTEQ (Interface of Multidimensional Analyzes of Textes et de Questionnaires), by the method of Classification Hierarchical Descending (CHD), with the objective of verifying word classes and their organization. Subsequently, the corpus was submitted to the thematic - categorial analysis highlighting the themes "Assistance" and "Professional Practices". As results of this study, was verifyed the presence of concepts of PHC assistance both convergent and divergent with SUS guidelines and mini-ministerial PHC regulations, but the data revealed practices that, for the most part, deviated from the health promotion model, thus evidencing, social representations anchored in the biomedical model. In addition, the investigation of the historical and cultural processes of organization of the APS, especially the NASF in Itamarandiba, clarified the context of production of the social representations, allowing the understanding of how much the same favors the permanence of anchored ducts in a model of assistance vertical, with fragmented and isolated practices that hinder the intersectoriality and distance themselves from the understanding of the instrument matrix support. It is noticed the existence of practices based on the model of health promotion, but that need to be strengthened. It is hoped that this work will foster reflections among the professionals of the PHC teams, the coordinators and managers of Itamarandiba, in order to problematize how much the work process and the organization of the actions and health services of the municipality need to be re-evaluated and reconfigured aimed at strengthening PHC. With this, to enable NASF to act in partnership with the ESF teams, under the logic of matrix support and reference teams, aiming at the organization of the municipal health system, and, consequently, improving the quality of life of users.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-02-22T23:19:52Z No. of bitstreams: 1 RalinyOliveiraSantos_DISSERT.pdf: 9138081 bytes, checksum: 38a641e3ede8b16533d07f1b59d2e852 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-02-26T19:19:40Z (GMT) No. of bitstreams: 1 RalinyOliveiraSantos_DISSERT.pdf: 9138081 bytes, checksum: 38a641e3ede8b16533d07f1b59d2e852 (MD5) / Made available in DSpace on 2016-02-26T19:19:40Z (GMT). No. of bitstreams: 1 RalinyOliveiraSantos_DISSERT.pdf: 9138081 bytes, checksum: 38a641e3ede8b16533d07f1b59d2e852 (MD5) Previous issue date: 2014-08-11 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / Indiv?duos dependentes de etanol, ao reduzirem ou cessarem seu consumo, apresentam um conjunto de sinais e sintomas, dentre eles, alguns relacionados ? ansiedade. Para um melhor entendimento das bases neurais envolvidas com a ansiedade na abstin?ncia, ensaios pr?-cl?nicos v?m utilizando modelos de consumo de etanol seguido de retirada em ratos submetidos a distintos testes de ansiedade, dentre eles, o labirinto em cruz elevado. O presente estudo teve por objetivo investigar se a retirada do etanol em curto e longo prazo promoveria altera??es comportamentais sugestivas de ansiedade no teste do labirinto em cruz elevado (LCE) e no teste do campo aberto (CA) e, ainda, se influenciaria o n?mero de c?lulas imunorreativas para a serotonina (5-HT-IR) no n?cleo dorsal da rafe (NDR), fonte de inerva??o seroton?rgica ascendente relacionada ? ansiedade. Ratas Wistar com aproximadamente 90 dias de vida foram submetidas a concentra??es crescentes de etanol como ?nica fonte de dieta l?quida (2% durante os tr?s primeiros dias, seguido de 4% durante tr?s dias e 6% durante 15 dias) ou ?gua (grupo controle), ambos com livre acesso ? ra??o. Na etapa comportamental, no 21? dia de consumo, o etanol foi substitu?do por ?gua (retirada) e, ap?s 72 horas ou 21 dias de retirada, os animais controle e submetidos ? retirada foram expostos ao teste do LCE, onde foram avaliadas as porcentagens de tempo gasto e de entradas nos bra?os abertos e o n?mero de entradas nos bra?os fechados durante 5 minutos. Vinte e quatro horas ap?s o teste no LCE, os animais foram submetidos ao teste do CA por 15 minutos. Durante este per?odo avaliou-se a dist?ncia total percorrida pelos animais e durante os 5 minutos iniciais foram avaliados o tempo, a dist?ncia e o n?mero de entradas no centro do aparato. Na etapa imunoistoqu?mica, os enc?falos de animais submetidos ao consumo de etanol por 21 dias, seguidos ou n?o de retirada de 72 horas e 21 dias, e seus controles foram submetidos ? t?cnica da imunoistoqu?mica para detectar c?lulas 5-HT-IR nas por??es dorsal e caudal do NDR. Os dados comportamentais mostraram que tanto a retirada do etanol em curto prazo, quanto em longo prazo diminuiu a explora??o dos bra?os abertos do LCE. No teste do CA n?o foram observadas altera??es na locomo??o no per?odo de 15 minutos; por?m, no mesmo teste, durante os 5 primeiros minutos observou-se efeito do tipo ansiog?nico nos animais submetidos ? 22 dias de retirada do etanol. Na etapa imunoistoqu?mica, n?o foram observadas diferen?as na contagem de c?lulas 5-HTIR nas por??es dorsal e caudal do NDR dos animais submetidos ? retirada em curto e longo prazo do etanol, em rela??o ao controle. No entanto, o consumo do etanol por 21 dias reduziu a contagem de c?lulas 5-HT-IR na regi?o dorsal deste n?cleo. Em conjunto, os dados aqui obtidos demonstram um efeito do tipo ansiog?nico promovido pela retirada em curto e longo prazo do etanol n?o relacionado a altera??es na marca??o de serotonina nas por??es dorsal e caudal do NDR. / Ethanol withdrawn individuals present a wealth of signs and symptoms, some of them related with anxiety. To better understand brain areas involved in anxiety caused by ethanol abstinence, preclinical studies have been employing models of ethanol consumption followed by withdrawal in rodents submitted to behavioral tests of anxiety, such as the elevated plus-maze. The aim of this study was to investigate if short- or long-term ethanol withdrawal could alter both anxiety-related behaviors in the elevated plus-maze (EPM) and open field tests and the number of serotonin immunorreactive cels in the dorsal raphe nucleus, a midbrain area associated with anxiety. Female Wistar rats (90 days old) were submitted to increasing concentrations of ethanol (2% for 3 days, 4% for 3 days and 6% for 15 days) as the only source of liquid diet and the control group received water ad libitum. Both groups received food ad libitum. In the behavioral experiments, on 21st day of consumption, ethanol was substituted by water (withdrawal) and 72 h or 21 days after withdrawal animals were submitted to the EPM, where it was evaluated the percentage of time and entries in the open arms and the entries in the enclosed arms during 5 minutes. Twenty and four hours after testing in the EPM, animals were submitted to the open field test for 15 minutes, where the distance traveled by the animals was observed along this period. During the first 5 minutes, the distance traveled, entries and time spent in the center of the test were analyzed. In the immunohistochemistry study, animals were submitted to 21 days of consumption of ethanol followed or not by 72 hours and 21 days of withdrawal previously perfusion, brain tissue preparation and quantification of serotonin dyed cells in the dorsal and caudal portions in the dorsal raphe nucleus. Behavioral data showed that both short- and long-term ethanol withdrawals reduced the open arms exploration in the EPM. In the open field test there were no locomotor activity changes during the total 15 minutes; however, longterm ethanol withdrawal reduced the exploration in the center of the open field during the first 5 minutes. In the immunohistochemistry step, there were no differences, when short- and long-term withdrawn groups were compared with control group; nevertheless, the chronic consumption of ethanol decreased the number of serotonergic immunorreactive cells in the dorsal part of dorsal raphe nucleus. Taken together, results here obtained suggest that both short- and long-term ethanol withdrawals promoted an anxiogenic-like effect that was not related with changes in the serotonin immunorreactivity in the dorsal and caudal parts of the dorsal raphe nucleus.

Made available in DSpace on 2014-12-17T15:14:47Z (GMT). No. of bitstreams: 1 FabioCA.pdf: 422263 bytes, checksum: 38e453430108d31eaf2c39772eae20ed (MD5) Previous issue date: 2008-04-29 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / This work is a detailed study of self-similar models for the expansion of extragalactic radio sources. A review is made of the definitions of AGN, the unified model is discussed and the main characteristics of double radio sources are examined. Three classification schemes are outlined and the self-similar models found in the literature are studied in detail. A self-similar model is proposed that represents a generalization of the models found in the literature. In this model, the area of the head of the jet varies with the size of the jet with a power law with an exponent γ. The atmosphere has a variable density that may or may not be spherically symmetric and it is taken into account the time variation of the cinematic luminosity of the jet according to a power law with an exponent h. It is possible to show that models Type I, II and III are particular cases of the general model and one also discusses the evolution of the sources radio luminosity. One compares the evolutionary curves of the general model with the particular cases and with the observational data in a P-D diagram. The results show that the model allows a better agreement with the observations depending on the appropriate choice of the model parameters. / Este trabalho se constitui num estudo detalhado dos modelos auto-similares para a expans?o de r?dio fontes extragal?cticas. ? feita uma revis?o das defini??es dos NAGs, discute-se o modelo unificado e examina-se as principais caracter?sticas das radio fontes duplas. Apresenta-se os tr?s esquemas de classifica??o para as mesmas e estuda-se em detalhe os modelos auto-similares existentes na literatura. ? proposto um modelo auto-similar que representa uma generaliza?ao dos modelos existentes. Neste modelo, a ?rea da cabe?a do jato varia com o tamanho do jato de acordo com uma lei de pot?ncia determinada pelo par?metro γ. A atmosfera pode ter uma densidade vari?vel que pode ser ou n?o esfericamente sim?trica e leva-se em conta a varia??o temporal da luminosidade cinem?tica do jato seguindo uma lei de pot?ncia determinada pelo par?metro h. ? poss?vel mostrar que os modelos Tipo I, II e III s?o casos particulares do modelo geral e discute-se a evolu??o da luminosidade r?dio das fontes. Compara-se as curvas evolutivas do modelo geral com os casos particulares e tamb?m com os dados observacionais num diagrama P-D. Os resultados mostram que o modelo permite um melhor ajuste com as observa??es dependendo da escolha apropriada dos par?metros do mesmo.

Submitted by Caroline Xavier (caroline.xavier@pucrs.br) on 2017-05-23T17:36:08Z No. of bitstreams: 1 TES_EDIO_GIACOMELLI_PARCIAL.pdf: 198707 bytes, checksum: 700e5dcbdc3f86f944c5b7b7bfc87e7f (MD5) / Made available in DSpace on 2017-05-23T17:36:08Z (GMT). No. of bitstreams: 1 TES_EDIO_GIACOMELLI_PARCIAL.pdf: 198707 bytes, checksum: 700e5dcbdc3f86f944c5b7b7bfc87e7f (MD5) Previous issue date: 2017-01-05 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / The aim of this study was to evaluate the biocompatibility of conventional glass ionomer cement (GIC) modified by calcium carbonate by means of cytotoxicity and genotoxicity tests. The calcium carbonate (CC), in proportions of 1%, 5% and 10%, was added to the GIC powder. A polytetrafluoroethylene matrix (10 mm diameter and 3 mm height) was used to make the samples, and four groups were obtained (n = 4): G1 ? only GIC (control); G2 ? GIC with 1% CC; G3 ? GIC with 5% CC; G4 ? GIC with 10% CC. The preparation of the samples was carried out in accordance with ISO 10993-12. The MTT test was used to evaluate the cell cytotoxicity, and the micronucleus and comet tests were performed to evaluate the genotoxicity, by using a mouse fibroblast cell culture of the NIH/3T3 lineage. According to MTT test, the samples with 1% and 5% CC showed a higher cytotoxic potential, and the samples with 10% CC presented a cellular viability index comparable to the GIC. The micronucleus test showed that GIC with 10% CC produced an improvement in cell proliferative potential (IPBC).CIV with 5% CC had a reduction in IPBC that did not compromise the material from the genotoxic point of view. In the comet test, groups with the addition of CC had a small increase in genotoxic potential compared with GIC. It was concluded that the addition of 10% CC to the GIC had a low cytotoxic potential and it is feasible for use in the cellular environment, and the addition of 1%, 5% and 10% CC to the GIC did not induce genetic damage. / Este estudo teve o objetivo de avaliar a biocompatibilidade do cimento de ion?mero de vidro (CIV) convencional modificado por carbonato de c?lcio de conchas marinhas por meio dos testes de citotoxicidade e genotoxicidade celular. O carbonato de c?lcio (CC), nas propor??es de 1%, 5% e 10%, foi adicionado ao p? do CIV. Utilizando uma matriz de politetrafluoretileno (10 mm de di?metro e 3 mm de altura), foram confeccionadas as amostras, sendo obtidos quatro grupos (n=4): G1 ? apenas CIV (controle); G2 ? CIV com 1% de CC; G3 ? CIV com 5% de CC; G4 ? CIV com 10% de CC. A prepara??o das amostras foi realizada de acordo com a norma ISO 10993-12. O ensaio MTT foi utilizado para avaliar a citotoxicidade celular, e os ensaios de micron?cleo e cometa foram realizados para avaliar a genotoxicidade, por meio da utiliza??o de uma cultura celular de fibroblastos de camundongo da linhagem NIH/3T3. De acordo com o ensaio MTT, as amostras contendo a adi??o de 1% e 5% de CC apresentaram um maior potencial citot?xico, e as amostras com 10% de CC apresentaram um ?ndice de viabilidade celular compar?vel ao do CIV. O ensaio do micron?cleo evidenciou que o CIV com 10% de CC produziu uma melhora no potencial proliferativo celular (IPBC). CIV com 5% de CC apresentou uma redu??o no IPBC que n?o compromete o material do ponto de vista genot?xico. No ensaio cometa, os grupos com adi??o de CC mostraram um pequeno aumento do potencial genot?xico em compara??o ao CIV. Concluiu-se que a adi??o de 10% de CC ao CIV apresentou um baixo potencial citot?xico, sendo vi?vel para utiliza??o em ambiente celular, e a adi??o de 1%, 5% e 10% de CC ao CIV n?o induziu a um dano gen?tico.

Submitted by Ricardo Cedraz Duque Moliterno (ricardo.moliterno@uefs.br) on 2015-07-31T21:39:35Z No. of bitstreams: 1 Disserta??o Final_Fernando Flores.pdf: 2552427 bytes, checksum: 56e64e9a4e8e38fa82bdf2d85f521c8b (MD5) / Made available in DSpace on 2015-07-31T21:39:35Z (GMT). No. of bitstreams: 1 Disserta??o Final_Fernando Flores.pdf: 2552427 bytes, checksum: 56e64e9a4e8e38fa82bdf2d85f521c8b (MD5) Previous issue date: 2014-03-21 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / Mixed flocks of birds are clusters of two or more species whose formation and cohesion depend on behavioral interactions among members. This study investigated the specific composition of mixed flocks in the Atlantic Forest area of Bahia, Brazil, considering the seasonal dynamics of flocks, the vertical distribution of their species, and the determination of species-nucleus, which are responsible for attracting and maintaining the cohesionof other species flocks. From August 2012 to August 2013, monthly expeditions of five days were conducted at the region of the Ecopolo I,in Pratigi Environmental Protection Area (Ibirapitanga, Bahia).The following data were recorded for each mixed-flock contacted: the specific composition, the number of individuals of each species and, when it was possible, the height of foraging, the occurrence of agonistic interactions, estimated intensity of movement and vocalization for each species. Furthermore, the contacts of mixed-flocks component species were recorded when they were seen out of the flocks, observing the foraging height and evidences of reproductive behavior.Was registered 113 contacts with mixed flocks, with a total of 51 species of birds, representing about 30% of the species recorded in the study area.In flocks, the most representative families were Thraupidae and Thamnophilidae - counting this one with two endangered species. Mixed flocks occurred throughout the whole year, being more frequent in August and less frequent from September to April.Due to the constantly rainfall throughoutyear in the study area, there was no correlation between frequency, richness and size of flocks with the monthly pluviosity. There was a negative correlation with the frequency of flocks and temperature. The richness and the size of flocks did not correlate with the temperature.The average richness in flocks was 5,1 ? 2,6 species, and the average size of 5 ? 5,2, individuals, these two variables were correlated positively (r = 0.81, p = <0.0001). The richness was different between the vegetation strato, being the understory flocks richer than the ones in canopy. However, in relation to size of individual numbers, the understory and canopy flocks didn?t present significant difference, because the canopy flocks were composed by a great number of Thraupidaespecies, that happened in large intraspecific group. Inside or outside of mixed flocks, all species foraged in the same height range of vegetation.Among the five most frequent flocks species, three were considered to be species-nucleus(Herpsilochmus rufimarginatus, Lanio cristatusandMyrmotherula urosticta),presenting a higher degree of associations between all species, and capable of recruiting more species for flocks when they took place; flocks where these species-nucleus occurred were richer, indicating that, when put together, these species increased the ability to recruit other species. / Bandos mistos de aves s?o agrupamentos de duas ou mais esp?cies cuja forma??o e coes?o se devema intera??es comportamentais entre seus integrantes. Este estudo investigou a composi??o espec?fica dos bandos mistos em uma ?rea de Mata Atl?ntica da Bahia, considerando a din?mica sazonal dos bandos, a distribui??o vertical de suas esp?cies e a determina??o das esp?cies-n?cleo, que s?o as respons?veis por atrair e manter coesas as demais esp?cies nos bandos. Foram realizadas, de agosto de 2012 a agosto de 2013, expedi??es mensais de cinco dias para a regi?o do Ecopolo I da ?rea de Prote??o Ambiental do Pratigi (Ibirapitanga, Bahia), quando eram registrados os dados de cada bando misto contatado: composi??o espec?fica, n?mero de indiv?duos de cada esp?cie e, sempre que poss?vel, a altura de forrageamento, a ocorr?ncia de agonismos e intensidades estimadas de movimenta??o e vocaliza??o de cada esp?cie; al?m disto, eram registrados os contatos com as esp?cies participantes de bandos mistos quando vistas fora destes, sendo observadas suas alturas de forrageio e evid?ncias de comportamentos reprodutivos. Foram feitos 113 contatos com bandos mistos, dos quais 51 esp?cies de aves, que representam cerca de 30% das esp?cies registradas na ?rea de estudo, participaram. Nos bandos, as fam?lias mais representadas foram Thraupidae e Thamnophilidae ? dentre esta ?ltima, duas esp?cies amea?adas de extin??o. Os bandos mistos ocorreram durante o ano todo, sendo mais frequentes no m?s de agosto e menos frequentes nos meses de setembro a abril. Devido ? ocorr?ncia de chuvas ao longo do ano todo na ?rea de estudo, n?o houve correla??o entre frequ?ncia, riqueza e tamanho dos bandos com a pluviosidade mensal; houve correla??o negativa entre a frequ?ncia dos bandos e a temperatura, n?o havendo correla??o da temperatura com riqueza e tamanho dos bandos. A riqueza m?dia nos bandos foi 5,1? 2,6esp?cies e o tamanho m?dio de,5 ? 5,2, indiv?duos, sendo estas duas vari?veis correlacionadas positivamente(r = 0,81; p = < 0,0001). Houve diferen?a na riqueza entre os estratos da vegeta??o, sendo que no sub-bosque os bandos eram mais ricos que os de dossel. No entanto, quanto ao tamanho, em n?mero de indiv?duos, os bandos de sub-bosque e dossel n?o apresentaram diferen?a significativa, pois os bandos de dossel eram compostos por um grande n?mero de esp?cies de traup?deos que ocorriam em grupos intraespec?ficos grandes. Dentro ou fora dos bandos mistos, todas as esp?cies forrageavam na mesma faixa de altura da vegeta??o. Das cinco esp?cies mais frequentes nos bandos, tr?s foram consideradas como esp?cies-n?cleo (Herpsilochmus rufimarginatus, Lanio cristatus e Myrmotherula urosticta), apresentando um maior grau de associa??es entre todas as esp?cies e capazes de arregimentar mais esp?cies para os bandos onde ocorriam; os bandos onde estas esp?cies-n?cleo ocorriam eram mais ricos, indicando que, quando juntas, estas esp?cies aumentavam a capacidade de arregimentar outras esp?cies.

Submitted by Ricardo Cedraz Duque Moliterno (ricardo.moliterno@uefs.br) on 2015-09-10T00:55:01Z No. of bitstreams: 1 Nilton C N Santos Tese Geno Cito Endo 10 ago 20h.pdf: 2096544 bytes, checksum: fd3a63f3f5235dae758262d72d8a3bb2 (MD5) / Made available in DSpace on 2015-09-10T00:55:01Z (GMT). No. of bitstreams: 1 Nilton C N Santos Tese Geno Cito Endo 10 ago 20h.pdf: 2096544 bytes, checksum: fd3a63f3f5235dae758262d72d8a3bb2 (MD5) Previous issue date: 2015-06-29 / Pulp therapy for deciduous teeth is the last resort for preventing tooth loss, but among the products used for this, i.e. so-called filling pastes, none is considered to be ideal. The objective of this study, using the micronucleus test on the bone marrow of mice and the comet assay on human lymphocytes, was to evaluate the genotoxic and cytotoxic effects of four filling pastes that are used in this therapy: zinc oxide, calcium hydroxide P.A., mineral trioxide aggregate and an iodoform paste (Guedes-Pinto paste). To perform the micronucleus test, male Swiss mice (Mus musculus) were divided into groups of ten animals each: four groups were each exposed to one of the filling pastes, administered intraperitoneally at dilutions of 1/10, 1/50, 1/500 and 1/1000. Cyclophosphamide was used as the positive control. The negative controls used were the dilution vehicles: dimethylsulfoxide (DMSO) for the Guedes paste and zinc oxide; and phosphate-buffered saline solution (PBS) for the calcium hydroxide P.A. and mineral trioxide aggregate. The animals were sacrificed 24 h and 48 h after the treatment. The bone marrow was extracted, in order to calculate the micronucleus occurrence rate in 1000 polychromatic erythrocytes (PCE) in each of the animals, under an optical microscope (1000 X), in a blinded test. Cytotoxicity was evaluated by determining the PCE/NCE (normochromatic erythrocyte) ratio in 200 erythrocytes/animal. For the comet assay, human lymphocytes were cultured in different dilutions of each of the filling pastes (1:500, 1:750, 1:1000 and 1:2000), for 3 h at 37 ?C, under an atmosphere containing 5% CO2. Two positive controls were used: methyl-methanesulfonate (0.4 ?M) for the calcium hydroxide P.A. and mineral trioxide aggregate; and doxorubicin (0.6 ?M) for the Guedes paste and zinc oxide. Two negative controls were also used here: distilled water for the calcium hydroxide P.A. and mineral trioxide aggregate; and DMSO for the Guedes paste and zinc oxide. Comets were identified by means of fluorescence microscopy (400 X), and 100 of them were counted on each of the three slides that were analyzed for each drug test. The statistical analysis on the results from the micronucleus test was performed using the conditional test for comparing proportions in situations of rare events. Analysis of variance, followed by the Tukey test, was used to assess the PCE/NCE ratio obtained from the different treatments and also to compare the means from the DNA damage indices that were obtained through the comet test, using the Prisma software, version 4.0. The micronucleus occurrence rate was significantly higher among the animals treated with Guedes paste, at all the dilutions tested and at both sacrifice times and also among the animals treated with zinc oxide and sacrificed 48 h after treatment at the dilutions of 1:50, 1:500 and 1:1000. Cytotoxic effects from these pastes were detected in the animals sacrificed at both times. Calcium hydroxide P.A. and mineral trioxide aggregate did not present any cytotoxic or genotoxic effects. The results obtained from the comet assay also showed that zinc oxide and Guedes paste presented genotoxicity, whereas calcium hydroxide P.A. and mineral trioxide aggregate did not. These results show that there is a need to reassess the use of zinc oxide and Guedes paste and provide encouragement for conducting additional studies to evaluate the genotoxicity and cytotoxicity of these pastes. / A terapia pulpar de dentes dec?duos se constitui no ?ltimo recurso de preven??o da perda dent?ria, mas, dentre os produtos empregados para tal, as denominadas pastas obturadoras, nenhum ? considerado como ideal. O objetivo deste trabalho foi avaliar, com o uso do teste de micron?cleo em medula ?ssea de camundongo e do ensaio cometa em linf?citos humanos, os efeitos citot?xicos e genot?xicos de quatro pastas obturadoras utilizadas nesta terapia: ?xido de zinco, hidr?xido de c?lcio P.A., agregado tri?xido mineral e uma pasta iodoformada (pasta Guedes-Pinto). Para realiza??o do teste de micron?cleo, camundongos Swiss (Mus musculus), machos, foram divididos em grupos de dez animais, que foram expostos ?s pastas obturadoras, administradas via intraperitoneal nas dilui??es de 1/10, 1/50, 1/500 e 1/1000. Ciclofosfamida foi utilizada como controle positivo. Os controles negativos foram: dimetilsulf?xido (DMSO) para a pasta Guedes-Pinto e ?xido de zinco; e solu??o salina tamponada (PBS) para o hidr?xico de c?lcio P.A. e agregado trioxido mineral. Os animais foram sacrificados 24h e 48h ap?s tratamento, a medula ?ssea foi extra?da e foram analisados 1000 eritr?citos policrom?ticos (PCE) de cada um dos animais, sob microscopia ?ptica (1000X) e em teste cego. A citotoxicidade foi avaliada pela rela??o PCE (eritr?cito policrom?tico) / NCE (eritr?cito normocrom?tico) em 200 eritr?citos/animal. Para o ensaio cometa, linf?citos humanos foram cultivados nas dilui??es de 1:500, 1:750, 1:1000 e 1:2000 das pastas obturadoras, durante 3h, a 37?C, em atmosfera de 5% de CO2. Foram utilizados dois controles positivos: metil-metanosulfonato (0,4?M) para o hidr?xido de c?lcio P.A. e agregado tri?xido mineral, e doxorrubicina (0,6 ?M) para a pasta Guedes-Pinto e ?xido de zinco. Foram tamb?m dois os controles negativos utilizados: ?gua destilada para o hidr?xido de c?lcio P.A. e agregado tri?xido mineral, e DMSO para pasta Guedes-Pinto e ?xido de zinco. A identifica??o do cometa foi realizada sob microscopia de fluoresc?ncia (400X), sendo computados 100 deles em cada uma das tr?s l?minas analisadas para cada droga teste. A an?lise estat?stica dos resultados do teste de micron?cleo foi realizada com o uso do teste condicional para compara??o de propor??es em situa??o de eventos raros. An?lise de vari?ncia, seguida do teste de Tukey, foram utilizados para avalia??o da rela??o PCE/NCE obtida com os diferentes tratamentos e tamb?m para compara??o das m?dias dos ?ndices de danos ao DNA obtidos no ensaio cometa com o software Prisma vers?o 4.0. A ocorr?ncia de micron?cleos foi significativamente maior nos animais tratados com a pasta Guedes-Pinto em todas as dilui??es testadas, nos dois tempos de sacrif?cio e tamb?m para os animais tratados com ?xido de zinco e sacrificados 48h ap?s tratamento, nas dilui??es 1:50; 1:500 e 1:1000. Efeitos citot?xicos destas pastas foram detectados nos animais sacrificados nos dois tempos. O hidr?xido de c?lcio P.A. e o agregado tri?xido mineral n?o apresentaram efeitos citot?xicos nem genot?xicos. Os resultados obtidos com o ensaio cometa tamb?m apontaram para a genotoxicidade do ?xido de zinco e pasta Guedes-Pinto, e n?o do hidr?xido de c?lcio P.A. e agregado tri?xido mineral. Estes resultados mostram a necessidade de reavalia??o do uso do ?xido de zinco e pasta Guedes-Pinto e suscitam a realiza??o de estudos adicionais avaliando a genotoxicidade e citotoxicidade destas pastas.

Made available in DSpace on 2014-12-17T14:03:38Z (GMT). No. of bitstreams: 1 MarcosFOG_DISSERT.pdf: 3390000 bytes, checksum: ba6308b2ffb8a1c987acbb7748b9335f (MD5) Previous issue date: 2011-10-14 / The Brazil is the third largest producer of cashew nuts in the world. Despite the social and economic importance of the cashew nut, its production is still carried out artisanally. One of the main problems encountered in the cashew production chain are the conditions under which the roasting of the nut occurs to obtain the kernel from the shell. In the present study was conducted a biomonitoring of the genotoxic and cytotoxicity effects associated with the elements from the cashew nut roasting in Jo?o C?mara - RN, semi-arid region of Brazil. To assess the genotoxic was used the bioassay of micronucleus (MN) in Tradescantia pallida. In addition, it was performed a comparative between the Tradescantia pallida and KU-20 and other biomarkers of DNA damage, such as the nucleoplasmic bridges (NBP) and nuclear fragments (NF) were quantified. The levels of particulate matter (PM1.0, PM2.5, PM10) and black carbon (BC) were also measured and the inorganic chemical composition of the PM2.5 collected was determined using X-ray fluorescence spectrometry analysis and the assessment of the cytotoxicity by MTT assay and exclusion method by trypan blue. . For this purpose, were chosen: the Amarel?o community where the roasting occurs and the Santa Luzia farm an area without influence of this process. The mean value of PM2.5 (Jan 2124.2 &#956;g/m3; May 1022.2 &#956;g/m3; Sep 1291.9 &#956;g/m3) and BC (Jan 363.6 &#956;g/m3; May 70.0 &#956;g/m3; Sep 69.4 &#956;g/m3) as well as the concentration of the elements Al, Si, P, S, Cl, K, Ca, Ti, Cr, Mn, Fe, Ni, Cu, Zn, Se, Br and Pb obtained at Amarel?o was significantly higher than at Santa Luzia farm. The genotoxicity tests with T. pallida indicated a significant increase in the number of MN, NBP and NF and it was found a negative correlation between the frequency of these biomarkers and the rainfall. The concentrations of 200 &#956;g/mL and 400 &#956;g/mL of PM2.5 were cytotoxic to MRC-5 cells. All together, the results indicated genotoxicity and citotoxicity for the community of Amarel?o, and the high rates of PM2.5 considered a potential contributor to this effect, mainly by the high presence of transition metals, especially Fe, Ni, Cu, Cr and Zn, these elements have the potential to cause DNA damage. Other nuclear alterations, such as the NPBs and NFs may be used as effective biomarkers of DNA damage in tetrads of Tradescantia pallida. The results of this study enabled the identification of a serious occupational problem. Accordingly, preventative measures and better practices should be adopted to improve both the activity and the quality of life of the population. These measures are of fundamental importance for the sustainable development of this activity. / O Brasil ? o terceiro maior produtor mundial de castanha de caju e apesar da import?ncia social e econ?mica, sua produ??o ainda ? realizada de forma artesanal. Um dos maiores problemas da cadeia produtiva do caju s?o as condi??es nas quais ocorre a queima artesanal da castanha para se obter a am?ndoa. No presente estudo foi realizado um biomonitoramento do potencial genot?xico e avalia??o da citotoxicidade associada aos elementos oriundos da queima artesanal da castanha de caju no munic?pio de Jo?o C?mara - RN, semi-?rido brasileiro. Para a avalia??o genot?xica foi utilizado o bioensaio de micron?cleo (MN) em Tradescantia pallida. Al?m disso, foi realizado um comparativo quanto a sensibilidade da T. pallida frente ao clone KU-20 e outros biomarcadores de danos no DNA, tais como as pontes nucleoplasm?ticas (PNP) e fragmentos nucleares (FN) foram quantificados. A avalia??o citot?xica se deu pelo ensaio MTT e m?todo de exclus?o por tripan blue. As concentra??es de material particulado (MP1,0, MP2,5, MP10) e black carbon (BC) foram determinadas e a composi??o inorg?nica do MP2.5 definida pela t?cnica de fluoresc?ncia de raios-X. Foram definidos dois pontos testes: Comunidade do Amarel?o (local de queima da castanha de caju) e Fazenda Santa Luzia (sem influ?ncia da atividade). Os valores m?dios obtidos para o MP2,5 (Jan - 2124,2 &#956;g/m3; Mai 1022,2 &#956;g/m3; Set 1291,9 &#956;g/m3) e BC (Jan 363,6 &#956;g/m3; Mai 70 &#956;g/m3; Set 69,4 &#956;g/m3), bem como a concentra??o dos elementos Al, Si, P, S, Cl, K, Ca, Ti, Cr, Mn, Fe, Ni, Cu, Zn, Se, Br e Pb obtidos no Amarel?o foram significativamente maiores que na Fazenda Sta. Luzia. Os testes de genotoxicidade com T. pallida indicaram um aumento de 2-7 vezes maior na frequ?ncia de MN para o Amarel?o. Os outros biomarcadores tamb?m apresentaram sua frequ?ncia aumentada. Al?m disso, verificou-se uma correla??o negativa entre a freq??ncia de MN, PNP e FN com a precipita??o pluviom?trica. As concentra??es de 200 &#956;g/mL e 400 &#956;g/mL do MP2,5 em suspens?o foram citot?xicas para as c?lulas MRC-5. O conjunto dos resultados indicaram genotoxicidade e citotoxicidade para a comunidade do Amarel?o, sendo as altas concentra??es de MP2,5 um dos prov?veis contribuintes para esse efeito, principalmente pela elevada presen?a de metais de transi??o, sobretudo Fe, Ni, Cu, Cr e Zn, que potencialmente causam les?es no DNA. Outras altera??es nucleares, como PNP e FN podem ser utilizadas como biomarcadores efetivos de danos no DNA em t?trades de T. pallida. Os conjunto dos resultados possibilitaram a identifica??o de um problema ocupacional grave, com s?rios riscos aos trabalhadores que exercem a atividade. Diante disto, a ado??o de medidas preventivas e de melhores pr?ticas, s?o de fundamental import?ncia para o desenvolvimento sustent?vel da atividade e melhoria na qualidade de vida dos trabalhadores.

Made available in DSpace on 2014-12-17T14:13:39Z (GMT). No. of bitstreams: 1 AlexandreEM_TESE.pdf: 2243848 bytes, checksum: 084d61604c2aa96c5c502207145559c0 (MD5) Previous issue date: 2011-05-23 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / The occurrence of human cancer in the municipality of Lucr?cia (RN, Brazil) has shown high frequencies (INCA, 2007). Tests of micronucleus (MN) and nuclear abnormalities (NA) were performed to assess the genotoxic potential of water from the Lucr?cia dam, which is located in a semi-arid region under the influence of crop irrigation and irregular rainfall. Water samples were collected in this source for analyzing the concentration of cyanobacteria, metals and radioactivity. Erythrocytes of Nile tilapia (Oreochromis niloticus) were collected in dam and cells of human oral mucosa in the urban area of this municipality for the bioassays of MN and NA. In fish were also analyzed concentrations of metals in samples of liver and gills. The genotoxicity tests with biological samples of fish and humans have shown significant increases in the frequencies of MN and NA (p &#8804; 0.05) and are indicative of increased DNA damage in relation to the control groups. In conclusion, the results obtained from water samples and biological municipality of Lucr?cia indicates that the presence of chemical and microbiological pollutants, and increase of genotoxic in human of this municipality. We suggest the implementation of advanced water treatment, to prevent further degradation of the aquatic environment and decrease in the life quality. This research of environmental quality assessment was performed in order to contemplate a multi and interdisciplinary character of this water resource and that can induce genotoxic damage in the organisms in this study region / A ocorr?ncia de c?ncer humano na regi?o do munic?pio de Lucr?cia (RN, Brasil) tem mostrado freq??ncias elevadas (INCA, 2007). Foram aplicados testes de micron?cleos (MN) e altera??es nucleares (NA) para avaliar o potencial genot?xico das ?guas do a?ude de Lucr?cia, que est? localizado numa regi?o semi-?rida sob influ?ncia de irriga??o agr?cola e precipita??o irregular. Foram coletadas amostras de ?gua nesse manancial para an?lise da concentra??o de cianobact?rias, metais e radioatividade. Foram coletados eritr?citos de til?pia do Nilo (Oreochromis niloticus) no manancial e c?lulas de mucosa oral humana na ?rea urbana desse munic?pio para os bioensaios de MN e NA. Nos peixes tamb?m foram analisadas as concentra??es de metais em amostras de br?nquias e f?gado. Os testes de genotoxicidade com amostras biol?gicas de peixes e humanos mostraram aumentos significantivos nas freq??ncias de MN e NA (p &#8804; 0,05) e s?o indicativos de aumento nos danos ao DNA em rela??o aos grupos controles. Concluindo, os resultados obtidos com as amostras de ?gua e biol?gicas do a?ude de Lucr?cia indicam a presen?a de poluentes qu?micos e microbiol?gicos, e tamb?m aumento do potencial genot?xico na popula??o humana desse munic?pio. Sugerimos a execu??o de tratamento h?drico avan?ado, para prevenir futura degrada??o desse ambiente aqu?tico e redu??o da qualidade de vida. Esta pesquisa de avalia??o da qualidade ambiental foi executada de forma a contemplar uma abordagem multi e interdisciplinar da caracter?stica deste recurso h?drico e os danos genot?xicos que possam induzir nos organismos desta regi?o em estudo

Made available in DSpace on 2014-12-17T14:13:58Z (GMT). No. of bitstreams: 1 LucilaCME.pdf: 777399 bytes, checksum: 0872bb60e8e228e6574e4fe1b87a20f8 (MD5) Previous issue date: 2006-12-21 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / The Pitimbu River is located at the oriental portion of the State of Rio Grande do Norte, including three importants cities named Maca?ba, Parnamirim e Natal. Although its high importance as a water source, which supplys great part of the South Zone of the Natal city, this river receives a large quantity of domestic and industrial waste water without treatment. The Pitimbu River headhas its river-head located in the city of Macaiba, goes through Parnamirim, then it flowing into at the Jiqui Lake in Natal. The aim of this study was to evaluate, qualitatively and quantitatively, the environmental quality of the Pitimbu River by genotoxicity bio-assays, which are important tools for genetics toxicological evaluation. In this work, five samples sites, distributed along the river, were used to collect water samples. Another point site, located near Jiqui lake, was used to collect drinkable water, which was treated by CAERN, the water treatment entreprise of Rio Grande do Norte. The following assays where used to evaluate the quality of these samples: Allium cepa assay; Comet assay; Micronuclei (MN) assay; and Ames test. For the Allium cepa assay, sixteen specimes where used for each water sample from the sample sites. In this assay both microscopic, like cytogenetic damage, and macroscopic aspects, as morphological variation were evaluated. Red blood cells from periferical blood of the Crenicichla menezesi native specie were used not only for the MN assay, but also for the Comet assay. These fishes were collected at different points on the Pitimbu River and the negative control was developed using fishes of the same species that were bring to the laboratory and maintained for 100 days in the optimal experimental conditions. For the Ames test, TA100, YG1042, TA98 and YG1041 strains were used in the directed method without metabolic activation. The results found by the Allium cepa assay showed that two water sample sites induced increase of mitotic index (IM). Additionally, compared to the control, all the water samples increased the chromossomal aberrations frequency and/or micronucleus. Among the sample sites, two also showed an abnormal growth rate in its root and two samples induced morphological alteration. With the MN test in red blood cells, a high frequence of MN was observed in tree sample. By comparing all the results obtained on the water sample points and with the negative control, a significant variation on the MN frequency was observed. Positive results were also observed for the same sample to water test by the Comet assay. These results allow concluding that the proposed specie Crenicichla menezesi has a good profile as a bio-indicator for the evaluation of environmental water quality and the MN and comet test can be usuful for in situ evaluation. By the Ames test, it was possible to detect the mutagenic activity on the waters from the Pitimbu River in different levels of mutagenicity. This result suggests that this river has several substances that induced changes directly to the DNA. The mechanisms involved to this phenomenon could be by both processes, by changing of the reading frame and by nucleotide substitution. These data set indicate the presence of mutagenic agents, which can represent in risk to biot and human beens / O rio Pitimbu localiza-se no litoral oriental do Estado do Rio Grande do Norte, mais precisamente na grande Natal, nos munic?pios de Maca?ba, Parnamirim e Natal. Embora se trate de um importante manancial, abastecendo parte da zona sul da capital do Estado, suas ?guas t?m sido alvo de dejetos industriais e dom?sticos, os quais n?o recebem tratamento adequado. O rio Pitimbu tem sua nascente situada no munic?pio de Maca?ba e des?gua na lagoa do Jiqu?, e parte em dire??o a praia de Pirangi, lan?ando suas ?guas no mar. O presente estudo teve como objetivo avaliar quantitativamente e qualitativamente a qualidade das ?guas do rio Pitimb?, atrav?s de bioensaios de genotoxicidade que s?o ferramentas de grande import?ncia nos estudos de gen?tica toxicol?gica. Neste trabalho foram coletadas amostras de ?gua de cinco pontos distribu?dos ao longo do rio e amostras da ?gua da lagoa do Jiqui ap?s tratamento feito pela CAERN (Companhia de ?guas e Esgotos do Rio Grande do Norte). Essas amostras foram analisadas atrav?s dos seguintes ensaios: teste de Allium cepa; o ensaio Cometa; o teste de Micron?cleo (MN); e o teste de Ames. Para realiza??o do teste em Allium cepa foram utilizados 16 indiv?duos para cada amostra testada, foram feitas an?lises dos aspectos microsc?picos (danos citogen?ticos) e macrosc?picos (varia??es morfol?gicas). Eritr?citos de sangue perif?rico da esp?cie nativa Crenicichla menezesi, foram utilizados tanto para execu??o do teste de MN como para o ensaio Cometa, os exemplares desta esp?cie foram coletados em diferentes pontos do rio Pitimbu e o controle negativo foi realizado com peixes da mesma esp?cie que foram trazidos para o laborat?rio e mantidos por 100 dias em condi??es ideais. Para execu??o do teste de Ames foram utilizadas as linhagens TA100, YG1042, TA98 e YG1041, sem ativa??o metab?lica, o qual foi realizado pelo m?todo direto. Os resultados obtidos no teste de Alium cepa monstraram que dois pontos de coleta de ?gua induziram altera??es no ?ndice mit?tico (?ndice de prolifera??o celular); al?m disso, todas as amostras de ?gua do rio induziram aumento na freq??ncia de aberra??es cromoss?micas e/ou de MN, em rela??o ao grupo controle. Dois dos pontos de coleta tamb?m apresentaram altera??o no crescimento da raiz e dois pontos produziram modifica??es morfol?gicas. Com o teste MN em eritr?citos uma alta freq??ncia de MN foi observada para tr?s amostras coletadas. Resultados positivos nas mesmas amostras teste tamb?m foram obtidos com o ensaio cometa. Estes resultados sugerem que a esp?cie Crenicichla menezesi pode ser considerado como um bom bioindicador para an?lise de qualidade ambiental e que os testes de MN e cometa s?o vi?veis para an?lise in situ. No teste de Ames, foi poss?vel detectar a presen?a de atividade mutag?nica nas ?guas do rio Pitimbu em diferentes n?veis de mutagenicidade, sugerindo a presen?a de compostos que agem de forma direta no DNA tanto por mudan?a do quadro de leitura quanto por substitui??o de pares de bases. Em conjunto os dados indicam a presen?a de agentes mutag?nicos, o que pode representar risco para a biota e os seres humanos