Neurofisiologia hipocampal durante sessões de sono intercaladas por exploração espacial: Reverberação do passado ou predição do futuro?

The ability to predict future rewards or threats is crucial for survival. Recent studies have addressed future event prediction by the hippocampus. Hippocampal neurons exhibit robust selectivity for spatial location. Thus, the activity of hippocampal neurons represents a cognitive map of space during navigation as well as during planning and recall. Spatial selectivity allows the hippocampus to be involved in the formation of spatial and episodic memories, including the sequential ordering of events. On the other hand, the discovery of reverberatory activity in multiple forebrain areas during slow wave and REM sleep underscored the role of sleep on the consolidation of recently acquired memory traces. To this date, there are no studies addressing whether neuronal activity in the hippocampus during sleep can predict regular environmental shifts. The aim of the present study was to investigate the activity of neuronal populations in the hippocampus during sleep sessions intercalated by spatial exploration periods, in which the location of reward changed in a predictable way. To this end, we performed the chronic implantation of 32-channel multielectrode arrays in the CA1 regions of the hippocampus in three male rats of the Wistar strain. In order to activate different neuronal subgroups at each cycle of the task, we exposed the animals to four spatial exploration sessions in a 4-arm elevated maze in which reward was delivered in a single arm per session. Reward location changed regularly at every session in a clockwise manner, traversing all the arms at the end of the daily recordings. Animals were recorded from 2-12 consecutive days. During spatial exploration of the 4-arm elevated maze, 67,5% of the recorded neurons showed firing rate differences across the maze arms. Furthermore, an average of 42% of the neurons showed increased correlation (R>0.3) between neuronal pairs in each arm. This allowed us to sort representative neuronal subgroups for each maze arm, and to analyze the activity of these subgroups across sleep sessions. We found that neuronal subgroups sorted by firing rate differences during spatial exploration sustained these differences across sleep sessions. This was not the case with neuronal subgroups sorted according to synchrony (correlation). In addition, the correlation levels between sleep sessions and waking patterns sampled in each arm were larger for the entire population of neurons than for the rate or synchrony subgroups. Neuronal activity during sleep of the entire neuronal population or subgroups did not show different correlations among the four arm mazes. On the other hand, we verified that neuronal activity during pre-exploration sleep sessions was significantly more similar to the activity patterns of the target arm than neuronal activity during pre-exploration sleep sessions. In other words, neuronal activity during sleep that precedes the task reflects more strongly the location of reward than neuronal activity during sleep that follows the task. Our results suggest that neuronal activity during sleep can predict regular environmental changes

Expressão de zif268 no cérebro do lagarto Tropidurus Hispidus após exploração de um ambiente enriquecido.

In the present work, we investigated behavioral changes associated with the increase in Zif268 protein expression within telencephalic areas of the tropical lizard Tropidurus hispidus that correspond to the mammalian hippocampus (HC). We used 13 male individuals of this species, collected at the Federal Agrotechnical School of Rio Grande do Norte, under SISBIO license number 19561-1. Four animals had their brains removed and were submitted to a Western blot with antibodies for the Zif268 protein. The remaining animals were separated in two different groups: a control group (n=4) and an exploration group (n=5). Animals from the exploration group were exposed to an enriched environment with many sensory cues novel to them. Control group animals stayed in the environment they were already habituated to. After 90 min from the onset of exposure to the new environment, animals from both groups were submitted to intracardiac perfusion with fixative, and the brains were removed, cryoprotected and frozen. After that, brains were sectioned at 20 μm and the sections were subjected to immunohistochemistry for the Zif268 protein. We verified that the Zif268 protein is likely conserved in the brain of T. hispidus, which showed antigenicity for the antibody anti-Zif268 made in mammals. In animals from the exploration group, we detected an increase of the Zif268 protein in the Septum, Striatum, Dorsoventricular Area and in cortical areas corresponding to the HC. This increase was proportional to the amount of environmental exploration, with maximum positive correlation in the hippocampal subareas Medial Cortex (R = 0.94 and p = 0.004) and Dorsomedial Cortex (R = 0.92 and p = 0.006). The data corroborate the notion that the reptilian hippocampus, as well as the mammalian HC, plays an important role in spatial exploration.

Sexo não é brincadeira: o sentido de infância para adolescentes inseridas na exploração sexual comercial

The childhood has being highlighted by the great concern about the several contexts in which children are inserted, amongst them, commercial sexual exploitation (CSE). The experience of this violence process brings implications to the person constitution. Thus, this research aimed to understand how commercial sexual exploited adolescents to signify the childhood. Participated of this research four female adolescents that had been assisted by Programa de enfrentamento ao Abuso e Exploração Sexual de Crianças e Adolescentes (Sentinela) , with ages between 12 and 17 years. The corpus was composed by the combination of the semi-structured interview and other procedures, like childish stories, draws and photography. Moreover, we used another instruments to constitute the corpus, like the documental research and we proposed the construction of a life story book of each participant. The corpus was analyzed through the Thematic Content Analysis. Five thematic axes emerged from the participants discourse and theoretical perspective: dynamical of family, scholar process, ludic behavior, conception of childhood and insertion on CSE process. The participants presented a conception about childhood as been a preparation and education phase to ingress in adult life. In other words, while children do not grown up, they go to the school, plays, lives with family, are happy and do not have any responsibilities. Nevertheless, the life experience of these girls was implicated by negligence, sexual abuse, child labor, institutionalization and, evidently, the commercial sexual exploitation. Understanding that the childhood experienced by adolescent, as well as, her insertion on CSECA, constitutes her, while person, we investigated how the interrelation expresses it on participants future perspectives. Their goals are defined based on family constitution and professional improvement, although feelings of disillusion and pessimism had been showed up in some moments. According these results, we pointed to the necessity of the effective proposals that promote real improvement of adolescents life quality, through, in which they could to create alternatives to get over the several risks in which they are exposed, mainly, the CSECA condition

Exploração sexual comercial de crianças e adolescentes : o estado da arte nas produções acadêmicas em psicologia

The Commercial Sexual Exploitation of Children and Adolescents (ESCCA) is a phenomenon that has been given priority in public policy agenda of many democratic governments of Western countries and civil sectors of society, besides the object of studies in different fields of knowledge. Psychology is among these areas and is considered one of the references in the construction of knowledge and actions to confront the phenomenon. However, the epistemological foundations of psychological science are quite different, and so, several are his speeches, knowledge produced and ways of conceiving man and the world. This is evident in the publications of psychology on ESCCA. This work aims to achieve a state of the art of psychology publication in Brazil (in the post-graduation - through theses and dissertations - and journals) on the Commercial Sexual Exploitation of Children and Adolescents. More specifically try to evidence (a) what conceptions of commercial sexual exploitation of children and adolescents the authors lists, (b) what are aimed at research and publications, (c) how the research and issues are justified, and (d) that theoretical approaches the authors are affiliated and methodological possibilities are applied to range the aim proposed in their work. In order to do so, a survey was conducted in the major index sites (eg, BVS-Psi, Capes, theses and dissertations database of university libraries) of the material, covering the period 1990 to 2007. Through research on these sites, we built a database, including information relating to the work sought from specific descriptors for studies in the area of victimization of children and adolescents, with reference to a list provided by Faleiros (2000). After reading the summary of the work, the number of recovered 25 productions was reached - including theses, dissertations and articles. For analysis of the material used in the analysis of thematic content. Two axes themes were established in order to guide the analysis: conceptual elements of commercial sexual exploitation, and theoretical and methodological strategies employed. The axes have as reference for analysis a chapter built on the concept of commercial sexual exploitation, so that all analysis is anchored on it. The analysis points to the existence, still strong, conceptual and terminological confusion about ESCCA. Few studies have not demonstrated this confusion, maintaining a consistent theoretical approach. In relation to the theoretical and methodological strategies, there is a great diversity of approaches in psychology surrounding the phenomenon of ESCCA, enriching levels of understanding and action. This diversity reflects a constitutive heterogeneity of psychological science. We emphasize the perspective of socio-historical psychology, most frequently among the publications. It is hoped that this research will help advance the qualitative approach to ESCCA, especially in the field of psychology, as well as contribute to new research in the area and construction of new means of addressing this human rights violation

Aplicação do Sensoriamento Remoto e do Sistema de Informações Geográficas na Detecção de Manchas de Óleo na Região do Pólo de Exploração de Guamaré, R.N.

Objective to establish a methodology for the oil spill monitoring on the sea surface, located at the Submerged Exploration Area of the Polo Region of Guamaré, in the State of Rio Grande do Norte, using orbital images of Synthetic Aperture Radar (SAR integrated with meteoceanographycs products. This methodology was applied in the following stages: (1) the creation of a base map of the Exploration Area; (2) the processing of NOAA/AVHRR and ERS-2 images for generation of meteoceanographycs products; (3) the processing of RADARSAT-1 images for monitoring of oil spills; (4) the integration of RADARSAT-1 images with NOAA/AVHRR and ERS-2 image products; and (5) the structuring of a data base. The Integration of RADARSAT-1 image of the Potiguar Basin of day 21.05.99 with the base map of the Exploration Area of the Polo Region of Guamaré for the identification of the probable sources of the oil spots, was used successfully in the detention of the probable spot of oil detected next to the exit to the submarine emissary in the Exploration Area of the Polo Region of Guamaré. To support the integration of RADARSAT-1 images with NOAA/AVHRR and ERS-2 image products, a methodology was developed for the classification of oil spills identified by RADARSAT-1 images. For this, the following algorithms of classification not supervised were tested: K-means, Fuzzy k-means and Isodata. These algorithms are part of the PCI Geomatics software, which was used for the filtering of RADARSAT-1 images. For validation of the results, the oil spills submitted to the unsupervised classification were compared to the results of the Semivariogram Textural Classifier (STC). The mentioned classifier was developed especially for oil spill classification purposes and requires PCI software for the whole processing of RADARSAT-1 images. After all, the results of the classifications were analyzed through Visual Analysis; Calculation of Proportionality of Largeness and Analysis Statistics. Amongst the three algorithms of classifications tested, it was noted that there were no significant alterations in relation to the spills classified with the STC, in all of the analyses taken into consideration. Therefore, considering all the procedures, it has been shown that the described methodology can be successfully applied using the unsupervised classifiers tested, resulting in a decrease of time in the identification and classification processing of oil spills, if compared with the utilization of the STC classifier

Exploração de fatores de risco para lesões desportivas em atletas de tênis de mesa

A prática do tênis de mesa requer inúmeras ações dinâmicas que podem conduzir a lesões desportivas, por isso é de importância conhecer fatores inerentes ao traumatismo nos atletas para posterior formulação dos modelos preventivos. Objetivou-se explorar os fatores de risco para lesões desportivas em mesa-tenistas. Para isso, foram entrevistados 111 atletas participantes do Campeonato Paulista de Tênis de Mesa, com média de idade de 22,39±8,88 anos de ambos os gêneros, recrutados ao acaso, classificados em dois níveis competitivos: regional/estadual e nacional/internacional. Utilizou-se o Inquérito de Morbidade Referida adaptado com as características do tênis de mesa com a finalidade de reunir dados pessoais, de treinamento e da lesão desportiva. Foram observadas 0,51 lesões por atleta, e os atletas de nível nacional/internacional apresentaram maiores índices de lesão (52,94%) do que os de nível estadual/regional (48,84%). No gesto específico, notou-se que os membros superiores (93,62%) e o tronco (87,5%) são os locais mais acometidos. Para ambos os níveis, o treinamento foi o momento mais relatado de ocorrência dos agravos. Conclui-se que atletas de nível nacional/internacional possuem maiores índices de lesão e que o gesto específico é a principal causa das lesões, acometendo principalmente os membros superiores e o tronco e ocorrendo com maior frequência durante o treinamento.

Recuperação de solos degradados na exploração mineral de cassiterita: biomassa microbiana e atividade da desidrogenase

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

Adolescentes em situação de prostituição: uma análise sobre a exploração sexual comercial na sociedade contemporânea

A presente pesquisa teve como objetivo principal compreender os processos que conduzem à produção da exploração sexual comercial de adolescentes na sociedade contemporânea. Realizamos uma análise da literatura da área e um estudo de campo, que contou com a participação de 14 adolescentes do sexo feminino, que se encontravam em situação de prostituição. Foram utilizados como procedimentos metodológicos: aplicação de questionários-entrevista, realização de entrevistas abertas, observações e informações de educadoras sociais. Elaboramos o perfil sócio-demográfico das adolescentes e suas famílias e criamos categorias temáticas expressivas dos conteúdos identificados. Constatamos que na produção do fenômeno encontram-se presentes múltiplos fatores que se entrecruzam de forma sinérgica nas trajetórias de vida das adolescentes. Ações de enfrentamento ao fenômeno requerem ações macro-estruturais e focais, nos mostrando a necessidade de repensarmos as concepções sobre os direitos das crianças e adolescentes, vivência de sexualidade, valores culturais e sociais, que acabam por permitir a emergência e perpetuação da exploração sexual comercial de crianças e adolescentes.

Mapeamento de Paleosuperfícies associadas a identificação de depósitos supérgenos de cobre como ferramenta de exploração mineral na região de Itapeva e Ribeirão Branco- Vale do Ribeira, estado de São Paulo, Brasil

A few examples of supergene ore formation and their interaction with morphogenesis (palaeosurfaces) and weathering mineralogy are discussed. Geomorphological and mineralogical records to characterize palaeosurfaces associate the weathering of primary minerals and their relationship with concentrations of cooper and iron ore deposits in southeastern state of São Paulo, Brazil. We have distinguished two palaeosurfaces generated by several weathering phases and controlled by the geological framework. The first and oldest upper palaeosurfaces (900 - 1000 m a.s.l.), situated in Riberão Branco (Alto do Brancal), were developed on silico-limestones. It is formed by typical iron laterites enriched by secondary products of cooper. The second and younger level palaeosurfaces located in Itapeva (Santa Blandina and Bairro do Sambra). This palaeosurface is formed by copper percolating through the weathered rock (saprolite). Other features can be observed like neo-formed products in laterites. They are classified into two types: clay like silico- cupriferous products (with noticeable amounts of iron) and copper minerals (crysocolla, in their flat slopes). These features allowed the presence of copper ores and their morphogenesis control will help in the exploration and prospecting of supergene ore mineral.

Exploração de fatores de risco na natação

Pós-graduação em Fisioterapia - FCT

A atuação de agentes públicos junto a meninas vítimas de abuso e exploração sexual em Ribeirão Preto

Pós-graduação em Ciências Sociais - FCLAR

A extração e a indústria da madeira no município de Rio Branco - AC

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Resíduos da exploração florestal de Eucalyptus grandis Hill Ex Maiden para geração de energia elétrica

Pós-graduação em Agronomia (Energia na Agricultura) - FCA

Análise da importância das receitas provenientes de concessões de serviços públicos e de compensações financeiras pela produção e exploração de petróleo e gás natural no orçamento dos governos subnacionais

Incluye Bibliografía

Os potenciais impactos cumulativos das grandes obras - novo corredor de exportação e exploração de hidrocarbonetos do campo mexilhão - no território da APA Marinha Litoral Norte (SP)

Pós-graduação em Geociências e Meio Ambiente - IGCE