Submitted by Jorge Silva (jorgelmsilva@ufrrj.br) on 2018-10-23T18:30:38Z No. of bitstreams: 1 2013 - Enely Maris da Silveira Firmiano.pdf: 6302423 bytes, checksum: d767e55220a0e40f0b8ee86826ca1a3e (MD5) / Made available in DSpace on 2018-10-23T18:30:38Z (GMT). No. of bitstreams: 1 2013 - Enely Maris da Silveira Firmiano.pdf: 6302423 bytes, checksum: d767e55220a0e40f0b8ee86826ca1a3e (MD5) Previous issue date: 2013-02-18 / CAPES / Phrynops geoffroanus is a freshwater turtle popularly known as Geoffroy's toadhead turtle or Geoffroy's side-necked turtle. Like other species of the Testudines order, it is oviparous, meaning the females lay their eggs in the environment. The objectives of this article are to describe the morphology of the oviduct of P. geoffroanus as observed through light microscopy after performing standard histochemical techniques (AB pH 2.5, PAS, Mallory?s trichrome, xylidine Ponceau), besides identifying the endocrine cells in the various regions of the oviduct that produce motilin, serotonin and somatostatin through immunohistochemistry. The oviduct of this turtle is composed of five regions: the infundibulum, which receives the oocyte released at the moment of oocytation; the tube uterine (magnum), the spiraled region that produces the albumen; the isthmus, a transition region; the uterus, responsible for producing the egg shell; and the vagina, the final portion of the oviduct, which leads to the cloaca. The structure of the oviduct of P. geoffroanus is similar to that of other oviparous reptile species. Its description can be used for phylogenetic morphological comparisons. The immunohistochemistry study revealed the absence of neuroendocrine cells that produce motilin, serotonin and somatostatin in all regions of the oviduct. However, the existence of these cells in the gut of this turtle was verified, enabling the suggestion that the regulatory peptides produced by these cells are carried by the bloodstream and reach specific receptors on target cells located along the oviduct, to regulate the peristaltic movements of this organ. / Phrynops geoffronus ? uma esp?cie de r?ptil representante da ordem dos Testudines, popularmente conhecida como c?gado-de-barbichas ou c?gado-de-barbelas. Como os demais representantes desta ordem, ? uma esp?cie ov?para, ou seja, as f?meas colocam ovos no ambiente durante a reprodu??o. Os objetivos deste trabalho foram a descri??o histol?gica do oviduto das f?meas de P. geoffroanus com aux?lio da microscopia de luz, ap?s ser submetido ?s t?cnicas histol?gicas e histoqu?micas (AB pH 2,5, PAS, Tricr?mico de Mallory, Xylidine Ponceau), al?m de procurar identificar c?lulas end?crinas produtoras de motilina, serotonina e somatostatina atrav?s da imuno-histoqu?mica, ao longo dos diversos segmentos do oviduto. O oviduto deste c?gado ? composto por cinco diferentes regi?es: infund?bulo, que recebe o ov?cito liberado no momento da ovocita??o; a tuba uterina (magno), regi?o espiralada produtora do alb?men; o istmo, uma regi?o de transi??o; o ?tero, respons?vel pela produ??o da casca do ovo, e a vagina, por??o final do oviduto que leva ? cloaca. A estrutura do oviduto de P. geoffroanus ? semelhante ? de outras esp?cies de r?pteis ov?paros e pode ser utilizada para compara??es morfol?gicas filogen?ticas. O estudo imuno-histoqu?mico revelou aus?ncia de c?lulas neuroend?crinas produtoras de motilina, serotonina e somatostatina em todas as regi?es do oviduto da esp?cie estudada. Entretanto, a exist?ncia dessas c?lulas foi verificada no intestino deste c?gado (teste-controle), tornando poss?vel sugerir que provavelmente os pept?deos regulat?rios produzidos por tais c?lulas, sejam transportados pela corrente sangu?nea e atinjam receptores espec?ficos em c?lulas-alvo localizadas ao longo do oviduto para atuarem na regula??o dos movimentos perist?lticos deste ?rg?o.

A soils infiltration rate (IR) is the measured rate that soil is able to absorb water, either from precipitation or irrigation. A low IR can cause damage to crops if the necessary amount of water cannot penetrate to the plant roots in the time needed. The damage can be common in permanent plantings such as almond and pistachio orchards where regular tillage is avoided. This indicates a physical aspect to the problem because tillage increases IR. However, there is also an electrochemical side to infiltration problems because certain calcium surfactant treatments can increase IR. Various other methods have been used to increase IR such as using cover crops and increasing organic matter. Despite these different approaches to the problem, the specific cause of low IR is often unknown. This study was conducted to determine what physical properties of soils from a site in California cause low IR. This research shows the relationship of these properties to low IR. It was assumed that high amounts of mica in the very fine sand and coarse silt fraction of soils in Northwestern Kern County, California may interact with other physical and chemical properties to reduce IR. Fourteen sites were sampled in the area near the towns of Wasco and Shafter. The soils sampled represented the typical agricultural soils of the area and exhibited three levels of infiltration, Good (no amendments), Moderate (requires gypsum), and Poor (gypsum application is insufficient). Mica percentages in the very fine sand and coarse silt were calculated using a petrographic microscope and compared to the overall IR of the fields. Mica was shown to be significant factor at all three levels of IR.

Memoria para optar al t?tulo de Ingeniero Civil Industrial / El objetivo del presente trabajo es dise?ar un plan de negocios para una empresa que ofrece servicios de educaci?n y asesor?a energ?tica para establecimientos educativos. Su realizaci?n responde a varias razones, entre ellas se encuentra el crecimiento de postulaciones a una certificaci?n ambiental destinada a dichos establecimientos otorgada por el Ministerio del Medio Ambiente, sumado a que ?stos tienen una participaci?n de alrededor del 15% en la industria de los servicios energ?ticos en pa?ses desarrollados (Jap?n y Estados Unidos). Por otro lado, expertos refieren la existencia de una oportunidad de ahorro y mejora de la gesti?n energ?tica en los establecimientos educativos. Para llevar a cabo el trabajo, se completan una serie de etapas con el prop?sito de analizar la factibilidad del emprendimiento. Inicialmente, se realiza un estudio de mercado mediante una encuesta y an?lisis de la competencia, con lo que se define el modelo de negocios de EcoEduca. Posteriormente, se elabora un an?lisis estrat?gico y plan de marketing, para luego estimar la demanda. Por ?ltimo, se desarrollan planes de operaciones, recursos humanos y plan financiero para finalmente medir la rentabilidad econ?mica del negocio. Los principales resultados son en primera instancia, que los colegios est?n m?s interesados en abordar la tem?tica de educaci?n energ?tica que la de gesti?n energ?tica, identificando como mercado meta a aquellos de dependencia particular o particular subvencionada con m?s de 500 estudiantes. A estos, se les ofrece un servicio que tiene como prop?sito educar y ahorrar a trav?s de un programa educacional que, a diferencia de la competencia, se enfoque en sustentabilidad energ?tica e incluya un servicio conexo de auditor?a energ?tica, para lo cual se establece como estrategia de marketing ofrecer un precio menor al mercado. Por otro lado, el plan de operaciones considera actividades relacionadas con captaci?n de clientes y ejecuci?n de los servicios, cuidando asegurar la calidad de la auditor?a energ?tica. Luego, el plan de recursos humanos identifica una estructura organizacional funcional, de la cual deriva un ?rea comercial y de operaciones. Finalmente, se obtiene que los resultados de la evaluaci?n econ?mica del proyecto son negativos, ya que indican que tiene un VAN de - $193,9 millones de pesos a una tasa de descuento del 8%, y seg?n proyecciones se deber?a recuperar la inversi?n en el a?o 15, esto se explica principalmente debido a la baja disposici?n a pagar de los establecimientos por el servicio con relaci?n a los costos estimados del negocio. Para profundizar esta evaluaci?n se realiza un an?lisis del punto de equilibrio, observando que la variable que m?s afecta porcentualmente la rentabilidad del proyecto son las remuneraciones, lo cual ocurre producto de que el proyecto depende casi en su totalidad de la fuerza laboral, comprobando que es poco escalable. Luego se realiza un an?lisis de escenarios, evidenciando que incluso en el caso m?s optimista, el cual considera disminuir el costo de las remuneraciones por a?o en un 14% contratando voluntarios y aumentando el precio al promedio de mercado (de $1,5MM a $2,5MM) se obtiene un VAN negativo. Expuesto estos antecedentes, se concluye que el proyecto no es factible econ?micamente, por lo que se recomienda no llevarlo a cabo, bajo este criterio.

In the present work, zinc phthalocyanine and tetra nitro substituted zinc phthalocyanine were sytnhesized by using phthalic anhydride and nitro phthalic acid precursor respectively under microwave irradiation. Molecular structures of these pigments were confirmed by FT-IR and UV-visible spectroscopy analyses. Furthermore, these pigments were deposited on mica-titania pigment substrate in dimethyl formamide solvent to obtain the combination pigment. FT-IR analysis was conducted to analyze the deposition of pigments onto the mica-titania surfaces. Fluorescence spectroscopy analysis was performed to observe zinc phthalocyanine, tetra nitro zinc phthalocyanine pigments, and their combination pigment with mica- titania pigments. The surface morphologies of zinc phthalocyanines on the mica titania pigments were investigated by scanning electron microscopy. Optimum deposition temperature and deposition time were determined by v depositing varying amounts of zinc phthalocyanines. The paint samples of these combination pigments were prepared by alkyd based paint formulation. L*a*b* values of the paint samples were determined by color measuring spectrophotometry. The optimum deposition temperature was determined as 120 oC and the optimum deposition time was determined as half an hour and effective deposition was obtained at 120 &deg / C. It is observed that, with the increasing amount of ZnPc, the interaction between ZnPc particles increases and they desorp the surface of mica-titania pigment. The best result was obtained with 0.08 g ZnPc at 120 oC.

Although not obvious at first sight, several parallels can be drawn between pregnancy andcancer. Many proliferative, invasive and immune tolerance mechanisms that supportnormal pregnancy are also exploited by malignancies to establish a nutrient supply andevade or edit the immune response of the host. The human placenta, of crucial importancefor pregnancy success, and its main cells, the trophoblast, share several features withmalignant cells such as high cell proliferation rate, lack of cell-contact inhibition andinvasiveness. Both in cancer and in pregnancy, the immune defense mechanisms,potentially threatening the survival of the tumor or the fetus, are progressively blunted oreven turned into tumor- or pregnancy-promoting players. Amongst immune mechanisms that are meant to protect the host from cancer and can be apotential threat to the fetus, the NKG2D receptor-ligand system stands out as the mostpowerful, stress-inducible “danger detector” system that comprises the activating NK cellreceptor NKG2D and its ligands, the MIC (MHC class I Chain-related proteins A and B)and ULBP (UL-16 Binding Proteins) families. It is the major cytotoxic mechanism in thebody promoting surveillance and homeostasis. In the present thesis we investigate theNKG2D receptor-ligand system in human early normal pregnancy and in theleukemia/lymphoma cell lines Jurkat and Raji and ask the questions “How is the NKG2Dreceptor-ligand system functioning in pregnancy and tumor? How is the danger of cytotoxicattack of the fetus avoided? Why is the immunosurveillance function compromised incancer patients?” We developed a method to isolate and culture villous trophoblast from early human normalplacenta and used it to study the NKG2D receptor-ligand system. We discovered that theNKG2D ligand families of molecules MICA/B and ULBP1-5 are constitutively expressedby the syncytiotrophoblast of the chorionic villi. Using immnunoelectron microscopy, westudied the expression of these molecules at the subcellular level and could show for thefirst time that they are preferably expressed on microvesicles in multivesicular bodies(MVB) of the late endosomal compartment and are secreted as exosomes. Exosomes arenanometer sized microvesicles of endosomal origin, produced and secreted by a great7variety of normal and tumor cells. The exosomes are packages of proteins and ribonucleicacids that function as “mail” or “messengers” between cells conveying different biologicalinformation. We isolated and studied exosomes from placental explant cultures. We foundthat they carry NKG2D ligands on their surface and are able to bind and down-regulate thecognate receptor on NK-, CD8+ and <img src="http://www.diva-portal.org/cgi-bin/mimetex.cgi?%5Cgamma" /><img src="http://www.diva-portal.org/cgi-bin/mimetex.cgi?%5Cdelta" />T cells. The down-regulation selectively causedimpairment of the cytotoxic response of the cells but did not affect their lytic ability asmeasured by perforin content and gene transcription. Thus, the NKG2D ligand-bearingexosomes suppress the cytotoxic activity of the cells in the vicinity of the placenta, leavingtheir cytolytic machinery intact, ready to function when the cognate receptor isrestored/recycled. These findings highlight the role of placental exosomes in the fetalmaternalimmune escape and support the view of placenta as an unique immunomodulatoryorgan. Next, we studied the expression and exosomal release of NKG2D ligands by tumor cellsusing the leukemia cell lines Jurkat and Raji as a tumor model. We found that NKG2Dligand-bearing exosomes with similar immunosuppressive properties as placental exosomesare constitutively secreted by the tumor cells, as a mechanism to blunt the cytotoxicresponse of the immune cells and thus protect themselves from cytotoxic attack by the host.Interestingly, we found that thermal- and oxidative stress up-regulates the exosomesecretion and the amount of exosome-secreted NKG2D ligands. Our results imply thattumor therapies that cause stress-induced damage, such as thermotherapy and stripping ofoxygen supply to the tumor, might have a previously unrecognized side effect causingenhanced exosome production and secretion, which in turn suppresses the natural antitumorimmune response and thus should be taken into account when designing an optimaltherapy of cancer patients. In conclusion, we describe a novel stress-inducible mechanism shared by placenta andtumors as an immune escape strategy. We found that placenta- and tumor-derived NKG2Dligand-bearing exosomes can suppress immune responses to promote the survival and wellbeing of the fetus or the tumor. Our work comprises an important contribution to theelucidation of the NKG2D ligand-receptor system and its mode of operation in the humanbody and opens new perspectives for designing novel therapies for infertility and cancer.

In the present work, anatase and rutile titanium dioxide (TiO2) coated lustrous mica pigments were prepared by heterogeneous nucleation method. Anatase-rutile phase transformation of the TiO2 on mica substrate was achieved by coating very thin layers of tin (IV) oxide on mica surfaces prior to TiO2 deposition. Muscovite mica, which was used in the experiments was sieved, pre-treated with sodium bicarbonate and decantated before coating process. The surface morphology of mica titania pigments and anatase-rutile phase transformation were investigated by SEM and XRD analyse, respectively. Also, microwave-assisted synthesis of copper phthalocyanine and tetracarboxamide copper phthalocyanine pigments were carried out with phthalic anhydride and trimellitic anhydride precursors, respectively. Molecular structures of these pigments were confirmed by FT-IR and UV-visible spectroscopy analyse. Furthermore, combination pigments were obtained by the process of deposition of copper phthalocyanine pigments on mica-titania pigment substrate in dimethyl formamide solvent. FT-IR analysis and XRD analyse were performed to observe the transformations in the crystal forms of copper phthalocyanines on the substrate. The surface morphologies of copper phthalocyanines on the mica titania pigments were investigated by SEM analysis. Varying amounts of copper phthalocyanines were deposited on the mica surfaces, and nitrogen elemental analysis was performed to determine the amount of copper phthalocyanines. The resulting pigments were incorporated into alkyd based resin to prepare paint samples. L*a*b* values, gloss property, and hardness of the paint samples were determined by color measuring device, gloss meter and hardness measuring device, respectively. The resulting combination pigments obtained in this study showed improved luster, hue, and color intensity. Furthermore, in literature it was reported that these pigments have very high bleed resistance. This can be attributed to large macromolecular structure of copper phthalocyanine on the surface of mica titania pigment that prevents bleeding of the pigment from the paint. Moreover, the paint samples obtained from combination pigments showed higher hardness with respect to the paint sample of the mica titania pigment.

No description available.

Mica based glass - ceramics have been produced by subjecting the glasses in the SiO2 , Al2O3 , CaO , MgO, K2O , and F system to a controlled heat treatment called crystallization. TiO2 was added into the batch in the amount of 1 wt% of the glass as nucleating agent. B2O3 additions in the amounts of 1, 2, 4 and 8 wt% of the glass have been made in the batch to see and evaluate the effects of B2O3 additions on the texture of the mica glass ceramics. Crystallization was accomplished in two steps, nucleation and crystal growth. Nucleation temperature was 650 &amp / #61616 / C. Crystal growth temperatures were 850 and 1000 &amp / #61616 / C. The time for holding the specimens at the temperatures was 8 hours. The X-Ray diffraction analysis revealed that resultant glass ceramics possessed not only synthetic fluormica crystals called phlogopite which provide machinability, but also wollastonite crystals which provide biocompatibility. The scanning electron microscopy examinations have indicated that the amount and distribution of the crystalline phases varied as a function of B2O3 content and heat treatment schedule applied.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-12-04T21:01:21Z No. of bitstreams: 1 MarianaRochaSousaSeverino_DISSERT.pdf: 1411126 bytes, checksum: 1b57794cbfe2cefd65ace0e98cfe1d85 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-12-07T22:53:50Z (GMT) No. of bitstreams: 1 MarianaRochaSousaSeverino_DISSERT.pdf: 1411126 bytes, checksum: 1b57794cbfe2cefd65ace0e98cfe1d85 (MD5) / Made available in DSpace on 2017-12-07T22:53:50Z (GMT). No. of bitstreams: 1 MarianaRochaSousaSeverino_DISSERT.pdf: 1411126 bytes, checksum: 1b57794cbfe2cefd65ace0e98cfe1d85 (MD5) Previous issue date: 2017-09-29 / A presente pesquisa se destina a an?lise das ag?ncias reguladoras no ?mbito do modelo de Estado regulador brasileiro, atrav?s do estudo sobre o desenvolvimento dessa nova estrutura??o estatal, em meio a necessidade da institui??o de uma nova ordem econ?mica. Com a ascens?o do Estado regulador, o Estado passa a assumir o papel de interventor sobre a economia, revalorizando as for?as de mercado, estimulando a livre iniciativa e livre concorr?ncia, fiscalizando, planejando, regulando e sancionando os agentes econ?micos, com possibilidade de atua??o no dom?nio econ?mico, assumindo um papel de agente na economia, garantindo as condi??es m?nimas de subsist?ncia da popula??o. Em meio ao contexto de regula??o, o Estado cria as ag?ncias reguladoras, como autarquias dotadas de autonomia refor?ada, objetivando realizar as atividades regulat?rias diante dos setores espec?ficos a que fossem destinadas. Assim, constitui-se objetivo geral o estudo das ag?ncias reguladoras frente ao modelo estatal brasileiro, sendo os objetivos espec?ficos a an?lise das fun??es atribu?das a estes entes, o impacto de suas atua??es diante de um amplo contexto e sobre os setores espec?ficos que estejam vinculadas, os entraves na sua forma de atuar, a desnecessidade de limitar sua autonomia, observar a inter-rela??o da tem?tica com o direito do consumidor, analisar a possibilidade da cria??o da Ag?ncia Nacional do Consumidor (ANC), ponderar os limites e desafios da atua??o estatal no ?mbito das rela??es de consumo, dificultados com a expans?o do com?rcio eletr?nico e o novo perfil de consumo. Para a realiza??o deste estudo, a metodologia utilizada ser? o m?todo indutivo, por meio da pesquisa indireta, com a realiza??o de revis?o bibliogr?fica da doutrina e legisla??o constitucional e infraconstitucional, atrav?s do procedimento hist?rico e comparativo. A partir da compreens?o da inter-rela??o com o direito do consumidor, ser? observada a possibilidade de aplica??o da Lei n? 8.078/1990 (C?digo de Defesa do Consumidor) como forma de gerar maior seguran?a, prote??o, qualidade e efici?ncia nos servi?os p?blicos, realizados pelo Poder P?blico ou pelos concession?rios e permission?rios. Ao examinar como alternativa para equilibrar as rela??es entre usu?rios e prestadores de servi?os a institui??o da ANC, concluiu-se n?o ser esta a forma mais vi?vel de lidar com essa necessidade, sendo sugeridos como alternativas um maior rigor fiscalizat?rio e sancionat?rio pelas ag?ncias j? existentes sobre os setores envolvidos, em conjunto com o Projeto de Lei n? 52/2013, que envolve a cria??o da Lei Geral das Ag?ncias Reguladoras e o Projeto de Lei n? 281/2012, que introduz ao C?digo de Defesa do Consumidor a prote??o no ?mbito do com?rcio eletr?nico, os quais finalizados os tr?mites dos processos se tornar?o alternativas mais seguras, prudentes e eficazes para gerar maior prote??o nas rela??es aqui tratadas. / The present research aims to analyze the Regulatory Agencies within the framework of the Brazilian Regulatory State model, through the study of this new state structure's development, in the midst of the need to establish a new Economic Order. With the rise of the Regulatory State, the State takes on the role of intervener in the economy, revalorizing market forces, stimulating free initiative and free competition, supervising, planning, regulating and sanctioning economic agents, with the possibility of acting in the economic domain, assuming an agent role in the economy, guaranteeing the minimum subsistence conditions to the population. Amidst of the regulatory context, the State creates Regulatory Agencies,as autarchies with enhanced autonomy, aiming to carry out regulatory activities in the specific sectors to which they were destined. Thus, the general objective of this study is the regulatory agencies in the context of the Brazilian state model, the specific objectives are the analysis of the functions attributed to these entities, the impact of their actions in a broad context and in the specific sectors that are linked, the lack of need to limit its autonomy, to observe the interrelationship of the issue with consumer law, to analyze the possibility of creating the National Consumer Agency (ANC), to consider the limits and challenges of state action in the context of consumer relations, hampered by the expansion of e-commerce and the new profile of consumption.In order to carry out this study, the methodology used will be the inductive method, through indirect research, with the accomplishment of a bibliographical review of the doctrine and constitutional and infraconstitutional legislation, through the historical and comparative procedure. Since the understanding of the interrelationship with consumer law, it will be observed the possibility of applying Law No. 8.078/1990 (Consumer's Protection Code), seeking to generate greater security, protection, quality and efficiency of the provision of public services, either by the government or by the concessionaires and permission holders. When examining the institution of ANC as an alternative to balance the relationships between users and services providers, it was concluded that this is not the most viable way to deal with this necessity, being suggested as an alternative a greater inspection and sanctioning rigor by the existing agencies on the involved sectors, in conjunction with Bill No. 52/2013, which involves the creation of the General Law on Regulatory Agencies and Bill No. 281/2012, which introduces to the Consumer's Protection Code the protection in the scope of electronic commerce, which, finalized the procedures, will become safer, more prudent and effective alternatives to generate greater protection in the relations dealt here.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-12-12T19:35:46Z No. of bitstreams: 1 RodrigoXavierSoares_TESE.pdf: 3740466 bytes, checksum: ff614cd85293ff3942f03a08100795a3 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-12-14T18:36:47Z (GMT) No. of bitstreams: 1 RodrigoXavierSoares_TESE.pdf: 3740466 bytes, checksum: ff614cd85293ff3942f03a08100795a3 (MD5) / Made available in DSpace on 2017-12-14T18:36:47Z (GMT). No. of bitstreams: 1 RodrigoXavierSoares_TESE.pdf: 3740466 bytes, checksum: ff614cd85293ff3942f03a08100795a3 (MD5) Previous issue date: 2017-05-12 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Grandes peixes pel?gicos representam um dos principais e mais lucrativos alvos da pesca industrial no Brasil. O Rio Grande do Norte pela posi??o geogr?fica privilegiada constitui hoje uma das regi?es em que a pesca oce?nica comercial ? mais produtiva com tendencia a amplia??o a partir de novas pol?ticas de incentivo governamental. Diferente de outras regi?es produtoras mundiais que v?m pesquisando as principais esp?cies exploradas, no Brasil estudos que objetivem a delimita??o de popula??es e dados gen?ticos para a conserva??o das esp?cies marinhas s?o escassos. Dentro dos grupos pel?gicos predomina menor diversidade em rela??o ? abund?ncia, isto ? caracter?stico em algumas das mais importantes fam?lias de peixes desta regi?o oce?nica, como Sphyraenidae (barracudas), Carangidae (xareus e pampos), Coryphaenidae (dourados) e Istiophoridae (marlins). A obten??o de dados citogen?ticos destas esp?cies se revestem de dificuldades log?sticas, tanto pelo tamanho dos exemplares, quanto pela forma de captura e habitat que ocupam. As primeiras informa??es citogen?ticas para algumas esp?cies destas fam?lias t?m apenas recentemente sido obtidas. Aqui ? realizado um amplo levantamento citogen?ticas de 9 esp?cies de peixes pel?gicos Atl?nticos, das fam?lias Sphyraenidae, Carangidae, Corypahenidae, Istiophoridae e Megalopidae e 1 Carangidae do Indo-Pac?fico. Os resultados revelaram diverg?ncias num?ricas e na macroestrutura cariot?pica, em contraste ao padr?o considerado basal para Teleostei, al?m da ocorr?ncia de um sistema de cromossomos sexuais m?ltiplos do tipo X1X1X2X2/X1X2Y em Coryphaenidae. A partir de t?cnicas como Ag-RONs, MM/DAPI foi poss?vel identificar a utilidade de s?tios ribossomais simples e sua localiza??o como eficientes marcadores citotaxon?micos para todas as esp?cies. T?cnicas citogen?ticas mais resolutivas de mapeamento de sequ?ncias multig?nicas (FISH - Fluorescence in situ Hybridization) possibilitaram pela primeira vez para algumas dessas fam?lias inferir sobre os processos carioevolutivos vigentes e aspectos evolutivos das esp?cies estudadas. A partir dos resultados obtidos ampliou-se o conhecimento sobre estes importantes recursos marinhos, subsidiando pol?ticas futuras de manejo dos estoques, bem como esteio futuro para o desenvolvimento tecnol?gico da aquacultura marinha. / The big pelagic fish represents one of the most lucrative subjects of the industrial fisheries in Brazil. The Rio Grande do Norte by the privileged geographic position constitutes nowadays one of the regions in which the commercial oceanic fishing is more productive and tends to expand with new policies of governmental incentive.Different from other World?s producer regions that are researching the main exploited species, in Brazil the studies that objectify the population delimitation and to list data for the conservation of the species are scarce. Among the pelagic groups is common to observe a predominance of a minor diversity in relation to the abundance, this is a characteristic in two of the most important families of this oceanic region, Sphyraenidae (barracudas), Carangidae (jacks and pompanos) and Coryphaenidae (dolphinfish) and Istiophoridae (marlins). Data about these species are surrounded of logistics difficulties for its size, capture way and habitat which occupies. The first cytogenetical informations for some species of this family were obtained only recently. Here is presented a cytogenetical study with 9 pelagic fish species from the Atlantic, of the families Sphyraenidae, Carangidae, Corypahenidae, Istiophoridae and Megalopidae and 1 Indo-Pacific Carangidae. The results revealed numerical divergences and in the karyotipical macrostructure contrasting with the pattern considered basal for the Teleosts, besides the existence of masculine heterogamety, through a system of multiple sexual chromosomes of the kind X1X1X2X2/X1X2Y. Using techniques such as AgNORs, MM/DAPI it was possible to identify single ribosomal sites and showed cytotaxonomic markers for all. It was also applied more resolutive cytogenetic techniques based on multigenic sequences mapping through FISH (Fluorescence in situ Hybridization) enabled for the first time for some of these families to infer about the active karyoevolutive processes and evolutive aspects of the investigated species. Through the developed techniques it will be also possible to expand the knowledge about this important marine resource,subsidizing future policies of the management of stocks, as well as future support for the technological development of marine aquaculture.