924 resultados para Marine pisciculture. Fish cytogenetics. Biotechnological processes. Interspecific hybridization


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Esta dissertação tem como título A natureza comunicativa da cultura: pesquisa exploratória sobre a Festividade de Carimbó de São Benedito de Santarém Novo – Pará. O objetivo da pesquisa é compreender a natureza comunicativa dessa festividade, observando as características que a constituem e nelas buscando elementos que são interpretados como processos comunicativos. A proposta parte das noções de natureza comunicativa da cultura em Martín-Barbero (2006) e França (2001), além da concepção de processo comunicativo desta pesquisadora. Delineamos, assim, os contextos nos quais a pesquisa está inserida, refletindo sobre a “invenção” da Amazônia (ARAGÓN, 2007; MAUÉS, 1999; DUTRA, 2009) e sua formação socio-histórica (BEZERRA NETO, 2001; BECKER, 2009) e cultural (SALLES, 2004; ALVES FILHO, 2001; LOUREIRO, 2000). No que se refere à Comunicação, buscamos sua “perspectiva antropológica” (WOLTON, 2006) aliada às relações entre mídia e modernidade (THOMPSON, 2011). Entendendo a Comunicação a partir da cultura, discutimos, observando a experiência cultural que a festividade representa (RODRIGUES, 1994), as relações entre a tradição e a modernidade (THOMPSON, 2011) em seus processos de hibridação (GARCÍA-CANCLINI, 2008). Além disso, refletimos sobre a “herança funcional” das pesquisas em Comunicação (WOLF, 2008; MARTÍN-BARBERO, 2004, 2006, 2009a; MARTINO, 2004, 2006) e nossa perspectiva de natureza comunicativa da cultura (MARTÍN-BARBERO, 2006; FRANÇA. 2001), relacionando-a aos conceitos de “mediações comunicativas da cultura” e de “midiatização” (BRAGA, 2012; SODRÉ, 2011). Para desenvolvermos a pesquisa de campo, além da pesquisa bibliográfica, utilizamos técnicas da etnografia para a coleta de dados, tais como: a observação participante, a entrevista em profundidade com os integrantes da festa e o diário de campo. Compreendemos, assim, a natureza comunicativa da festividade a partir dos elementos que a constituem destacando o seu caráter comunitário e de tradição, o que nos levou a evidenciar a comunicação em seu sentido de compartilhamento e de comunhão.

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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Pós-graduação em Microbiologia Agropecuária - FCAV

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Lipases have important applications in biotechnological processes, motivating us to produce, purify, immobilize and perform a biochemical characterization of the lipase from Rhizomucor pusillus. The fungus was cultivated by solid state fermentation producing lipolytic activity of about 0.5 U/mL(4U/g). A partial purification by gel filtration chromatography in Se-phacryl S-100 allowed obtaining a yield of about 85% and a purification factor of 5.7. Our results revealed that the purified enzyme is very stable with some significant differences in its properties when compared to crude extract. The crude enzyme extract has an optimum pH and temperature of 7.5 ° C and 40 ° C, respectively. After purification, a shift of the optimum pH from 7 to 8 was observed, as well as a rise in optimumtemperature to 60 ° C and an increase in stability. The enzyme was immobilized on CNBr-Agarose and Octyl-Agarose supports, having the highest immobilization yield of 94% in the second resin. The major advantage of immobilization in hydrophobic media such as Octyl is in its hyper activation, which in this case was over 200%, a very interesting finding. Another advantage of this type of immobilization is the possibility of using the derivatives in biotechnological applications, such as in oil enriched with omega-3 as the results obtained in this study display the hydrolysis of 40% EPA and 7% DHA from sardine oil, promising results compared to the literature.

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Ionizing radiation is the most recognized risk factor for meningioma in pediatric long-term cancer survivors. Information in this rare setting is exceptional. We report the clinical and cytogenetic findings in a radiation-induced atypical meningioma following treatment for desmoplastic medulloblastoma in a child. This is the second study to describe the cytogenetic aspects on radiation-induced meningiomas in children. Chromosome banding analysis revealed a 46, XX, t(1;3)(p22;q12), del(1)(p?)[8]/46, XX[12]. Loss of chromosome 1p as a consequence of irradiation has been proposed to be more important in the development of secondary meningiomas in adults. Deletions in the short arm of chromosome 1 also appear to be a shared feature in both pediatric cases so far analyzed.

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A small supernumerary marker chromosome (sSMC) derived from chromosome 22 is a relatively common cytogenetic finding. This sSMC typically results in tetrasomy for a chromosomal region that spans the chromosome 22p arm and the proximal 2 Mb of 22q11.21. Using classical cytogenetics, fluorescence in situ hybridization, multiplex ligation-dependent probe amplification, and array techniques, 7 patients with sSMCs derived from chromosome 22 were studied: 4 non-related and 3 from the same family (mother, daughter, and son). The sSMCs in all patients were dicentric and bisatellited chromosomes with breakpoints in the chromosome 22 low-copy repeat A region, resulting in cat eye syndrome (CES) due to chromosome 22 partial tetrasomy 22pter -> q11.2 including the cat eye chromosome region. Although all subjects presented the same chromosomal abnormality, they showed a wide range of phenotypic differences, even in the 3 patients from the same family. There are no previous reports of CES occurring within 3 patients in the same family. Thus, the clinical and follow-up data presented here contribute to a better delineation of the phenotypes and outcomes of CES patients and will be useful for genetic counseling. Copyright (C) 2012 S. Karger AG, Basel

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Samples from seven different locations of the genus Pimelodella were genetically examined, two caves (exclusively subterranean, upper Tocantins River and Sao Francisco River) and five epigean (from upper Parana River basin). Cytogenetic analyses revealed the same diploid number (2n=46) for all species besides similarities in both number and location of nucleolar organizer regions and C bands. FISH with 5S rDNA probes and CMA(3) staining indicated significant differences among the studied species. Application of PCR-RFLP in ATPase 6 and 8 mitochondrial genes allowed building a minimum evolution phenogram identifying the close evolutionary relationship among groups. Both chromosomal and molecular data were useful to infer the relationships among studied Pimelodella species.

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Die Systematik, Phylogenie und Biogeographie der Gattung Cousinia (Asteraceae, Cardueae) als größter Gattung der Tribus Cardueae mit mehr als 600 Arten wurde untersucht. Diese Dissertation umfasst drei Hauptteile: Im ersten Teil wurde die Phylogenie und Evolution des Arctium-Cousinia-Komplexes Untersucht. Dieser Gattungskomplex enthält Arctium, Cousinia, Hypacanthium und Schmalhausenia und zeigt die höchste Diversität in der Irano-Turanischen Region und in den Gebirgen Zentralasiens. Es wurden ITS und rpS4-trnT-trnL-Sequenzen für insgesamt 138 Arten generiert, darunter von 129 (von ca. 600) Arten von Cousinia. Wie in früheren Analysen bereits gefunden, ist Cousinia nicht monophyletisch. Stattdessen sind Cousinia subg. Cynaroides und subg. Hypacanthodes mit insgesamt ca. 30 Arten enger mit Arctium, Hypacanthium und Schmalhausenia (Arctioid Clade) als mit subg. Cousinia (Cousinioid Clade) verwandt. Die Arctioid und Cousiniod clades werden auch durch Pollenmorphologie und Chromosomenzahl unterstützt, wie bereits früher bekannt war. In dem Arctioid Clade entsprechen morphologische Gattungsgrenzen, basierend auf Blattform, Blattbedornung und Morphologie der Involukralblätter, nicht den in der molekularen analyse gefundenen clades. Es kann keine taxonomische Lösung für diesen Konflikt gefunden werden, und die gennanten Merkmale wurden als homoplastisch betrachtet. Obwohl die phylogenetische Auflösung in dem Cousinioid Clade schlecht ist, enthalten die ITS und rpS4-trnT-trnL-Sequenzen phylogenetische Information. So gruppierten z.B. die sechs annuellen Arten in zwei Gruppen. Schlechte phylogenetische Auflösung resultiert wahrscheinlich aus dem Mangel an Merkmalen und der großen Artenzahl in dieser artenreichen und vergleichsweise jungen (ca. 8,7 mya) Linie. Artbildung in dem Cousinioid Clade scheint hauptsächlich allopatrisch zu sein. Der zweite Teil der Dissertation untersucht die Rolle der Hybridisierung in der Evolution von Cousinia s.s. Die in der Vergangenheit publizierteten 28 Hybrid-Kombinationen und 11 Zwischenformen wurden kritisch geprüft, und zwei Hybridindividuen wurden morphologisch und molekular untersucht. Die vermutlichen oder nachgewiesenen Eltern der Hybriden und Zwischenformen wurden auf die aus einer Bayesischen Analyse der ITS-Sequenzen von 216 Arten von Cousinia und verwandten Gattungen resultierenden Phylogenie aufgetragen. Weder Hybriden zwischen dem Cousinioid Clade und anderen Haupt-Claden des Arctium-Cousinia-Komplexes noch zwischen annuellen und perennirenden Arten von Cousinia s.s. wurden beobachtet. Die Ergebnisse zeigen eindeutig, dass Hybridisierung in Cousinia möglich is, und dass ca. 10,7% der Arten an interspezifischer Hybridisierung beteiligt sind. Obwohl Hybridisierung in Cousinia s.s. stattfindet und zu den Schwierigkeiten bei der Rekonstruktion ihrer phylogenetischen Geschichte beitragen könnte, war ihre Rolle für die Entwicklung und Diversität der Gruppe offenbar gering. Im dritten Teil wird eine taxonomische Revision der C. sect. Cynaroideae präsentiert. Cousinia sect. Cynaroideae, die größte Sektion der Gattung mit 110 veröffentlichten Arten, zeichnet sich durch eine Chromosomenzahl von 2n = 24 und durch ± herablaufende Blätter und Hüllblätter mit Anhängseln aus. Sie kommt im Iran, Irak, dem Kaukasus, der Türkei, Turkmenistan, Afghanistan, Pakistan, dem Libanon und Anti-Libanon vor und hat ihre Hauptzentren der Artdiversität im westlichen und nordwestlichen Iran, im Irak und in der südöstlichen Türkei. Die Revision dieser Gruppe, hauptsächlich basierend auf der Untersuchung von ca. 2250 Herbarbögen, führte zu einer Verringerung der Artenzahl auf 31 Arten mit acht Unterarten. Alle Arten werden typifiziert und ausgeschlüsselt, und Beschreibungen, Abbildungen und Verbreitungskarten werden für jede Art angegeben.

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The present study was conducted to investigate the influence of restricted food access on Solea senegalensis behaviour and daily expression of clock genes in central (diencephalon and optic tectum) and pheripheral (liver) tissues. The Senegalese sole is a marine teleost fish belonging to the Class of Actinopterygii, Order Pleuronectiformes and Family Soleidae. Its geographical distribution in the Mediterranean sea is fairly broad, covering the south and east of the Iberian Peninsula, the North of Africa and Middle East until the coast of Turkey. From a commercial perspective Solea senegalensis has acquired in recent years, a key role in aquacolture industry of the Iberian Peninsula. The Senegalese sole is also acquiring an important relevance in chronobiological studies as the number of published works focused on the sole circadian system has increased in the last few years. The molecular mechanisms underlying sole circadian rhythms has also been explored recently, both in adults and developing sole. Moreover, the consideration of the Pleuronectiformes Order as one of the most evolved teleost groups make the Senegalese sole a species of high interest under a comparative and phylogenetic point of view. All these facts have reinforced the election of Senegalese sole as model species for the present study. The animals were kept under 12L:12D photoperiod conditions and divided into three experimental groups depending on the feeding time: fed at midlight (ML), middark (MD) or random (RND) times. Throughout the experiment, the existence of a daily activity rhythm and it synchronization to the light-dark and feeding cycles was checked. To this end locomotor activity was registred by means of two infrared photocells placed in pvc tube 10 cm below the water surface (upper photocell) and the other one was located 10 cm above the bottom of the tank (bottom photocell). The photocell were connected to a computer so that every time a fish interrupted the infrared light beam, it produced an output signal that was recorded. The number of light beam interruptions was stored every 10 minutes by specialized software for data acquisition.

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The present distribution of freshwater fish in the Alpine region has been strongly affected by colonization events occurring after the last glacial maximum (LGM), some 20,000 years ago. We use here a spatially explicit simulation framework to model and better understand their colonization dynamics in the Swiss Rhine basin. This approach is applied to the European bullhead (Cottus gobio), which is an ideal model organism to study fish past demographic processes since it has not been managed by humans. The molecular diversity of eight sampled populations is simulated and compared to observed data at six microsatellite loci under an approximate Bayesian computation framework to estimate the parameters of the colonization process. Our demographic estimates fit well with current knowledge about the biology of this species, but they suggest that the Swiss Rhine basin was colonized very recently, after the Younger Dryas some 6600 years ago. We discuss the implication of this result, as well as the strengths and limits of the spatially explicit approach coupled to the approximate Bayesian computation framework.