Correlação entre contexto morfoestrutural e sismicidade nas regiões de João Câmara e São Rafael (RN)

This MSc thesis describes brittle deformation in two seismic zones located in north-eastern Brazil: João Câmara and São Rafael, Rio Grande do Norte State. Both areas show seismogenic faults, Samambaia and São Rafael, indicated by narrow zones of epicentres with a strike of 040o, a lenght of 30 km and 4 km, and a depth of 1-12 and 0,5-4 km, respectively. The first seismological and geological studies suggested blind faults or faults that were still in the beginning of the nucleation process. The region is under E-W-oriented compression and is underlain by Precambrian terrains, deformed by one or more orogenic cycles, which generated shear zones generally marked by strong pervasive foliation and sigmoidal shapes. The crystalline basement is capped by the Cretaceous Potiguar basin, which is also locally capped by Pliocene continental siliciclastic deposits (Barreiras Formation), and Quaternary alluvium. The main aim of this study was to map epicentral areas and find whether there are any surface geological or morphotectonic expression related to the seismogenic faults. A detailed geological map was carried out in both seismic areas in order to identify brittle structures and fault-related drainage/topographic features. Geological and morphotectonic evidence indicate that both seismogenic faults take place along dormant structures. They either cut Cenozoic rocks or show topographic expression, i.e., are related to topographic heights or depressions and straight river channels. Faults rocks in the Samambaia and São Rafael faults are cataclasite, fault breccia, fault gouge, pseudotachylyte, and quartz veins, which point to reactivation processes in different crustal levels. The age of the first Samambaia and the São Rafael faulting movement possibly ranges from late Precambrian to late Cretaceous. Both fault cut across Precambrian fabric. They also show evidence of brittle processes which took place between 4 and 12 km deep, which probably have not occurred in Cenozoic times. The findings are of great importance for regional seismic hazard. They indicate that fault zones are longer than previously suggested by seismogenic studies. According to the results, the methodology used during this thesis may also be useful in other neotectonic investigation in intraplate areas

Veias do sistema porta-hepático em gansos domésticos

A distribuição intraparenquimal das veias porta-hepáticas foi estudada em 30 gansos domésticos. Latex Neoprene corado foi injetado pela veia isquiática e os animais forma fixados por imersão e injeção intramuscular com formol a 10% e dissecados. O fígado esteve composto por um grande lobo hepático direito e por um lobo hepático esquerdo menor, os quais estiveram conectados por uma ponte de parênquima. O lobo direito do fígado teve exclusivamente vasos do sistema porta-hepático formados pela distribuição intraparenquimal da veia porta-hepática direita, enquanto que no lobo esquerdo estes originaram-se da veia porta-hepática direita e de pequenas veias porta-hepáticas esquerdas. A veia porta-hepática direita emitiu o ramo caudal direito, que emitiu um pequeno ramo caudolateral direito e um grande ramo caudomedial direito. Cranialmente esta veia emitiu os ramos craniais direito e ramos lateral direito. A porção transversa da veia porta-hepática direita cruzou para o lobo hepático esquerdo, emitindo de 1 a 6 pequenos ramos craniais e caudais para a região média do fígado. No lobo esquerdo, o ramo esquerdo da veia porta-hepática direita emitiu o ramo cranial esquerdo, o ramo lateral esquerdo e o ramo medial. de 1 a 6 veias porta-hepáticas esquerdas foram identificadas desembocando ou no ramo esquerdo da veia porta-hepática direita ou em sua porção transversa, oriundos do ventrículo gástrico e do pró-ventrículo. em 40% dos gansos uma veia porta-hepática própria oriunda da confluência de vasos venosos da face esquerda do ventrículo distribuiu-se na extremidade caudal do lobo esquerdo isoladamente.

Testicular thermoregulation in Bos indicus, crossbred and Bos taurus bulls: relationship with scrotal, testicular vascular cone and testicular morphology, and effects on semen quality and sperm production

Mechanisms of testicular thermoregulation, the relationship of scrotal, testicular vascular cone (TVC), and testicular morphology with thermoregulatory capability, and their effects on semen quality and sperm production were studied in 20 Bos indicus, 28 crossbred, and 26 Bos taurus bulls. The ratio of testicular artery length and volume to testicular volume were larger (P < 0.05) in B. indicus and crossbred bulls than in B. taurus bulls (1.03 and 0.94 cm/cm(2). versus 0.48 cm/cm(3); 0.034 and 0.047 ml/cm(3) versus 0.017 ml/cm(3), respectively). Testicular artery wall thickness (average 192.5, 229.0, and 290.0 mum, respectively) and arterial-venous blood distance in the TVC (average 330.5, 373.7, and 609.4 pm, respectively) were smallest in B. indicus, intermediary in crossbred, and greatest in B. taurus bulls (P < 0.05); the proximity between arterial and venous blood was consistent with the estimated decrease in arterial blood temperature after passage through the TVC (5.9, 5.0, and 2.9 degreesC, in B. indicus, crossbred, and B. taurus bulls, respectively). In crossbred and B. taurus bulls, there was a positive top-to-bottom scrotal temperature gradient and a negative testicular subtunic temperature gradient. However, in B. indicus bulls, both scrotal and testicular subtunic temperatures gradients were positive. Differences in the vascular arrangement, characteristics of the artery (e.g. wall thickness) or thickness of the tunica albuginea may have affected the testicular arterial blood and subtunic temperatures in B. indicus bulls. Better testicular thermoregulatory capability was associated with increased scrotal shape (pendulosity), testicular artery length and volume, and top-to-bottom gradient of the distance between the artery wall and the veins in the TVC. Increased semen quality was associated with increased testicular volume and scrotal subcutaneous (SQT) temperature gradient, and with decreased scrotal surface and testicular temperatures. Increased sperm production was associated with increased testicular artery volume, testicular volume, and SQT temperature gradient, and with decreased testicular artery wall thickness, scrotal circumference (SC), and scrotal surface, testicular subtunic, and epididymal temperatures. In conclusion, morphology of the TVC may contribute to the greater resistance of B. indicus bulls to high ambient temperatures by conferring a better testicular blood supply and by facilitating heat transfer between the testicular artery and veins. Testicular thermoregulation was associated with opposing scrotal and testicular subtunic temperatures gradients only in crossbred and B. taurus bulls. Scrotal, TVC, and testicular morphology influence testicular thermoregulatory capability and were associated with differences in semen quality and sperm production. (C) 2003 Elsevier B.V. All rights reserved.

Trombectomia com cateter de Fogarty no tratamento da tromboflebite jugular experimental em eqüinos

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

Inside-out vein graft and inside-out artery graft in rat sciatic nerve repair

Although veins and arteries present similar wall structures, there are differences which may be relevant in peripheral nerve reconstruction. Inside-out vein grafts (IOVG) have been satisfactorily used to repair both motor and sensitive nerves. However, the inside-out artery graft (IOAG) is a new technique and not fully investigated. Our study presents comparative morphological data on nerve regeneration achieved with IOVG and IOAG in the repair of Wistar rat sciatic nerves. Jugular veins and aorta arteries were harvested from donor animals and used inside-out to bridge a 10-mm gap. Animals were sacrificed at 10 weeks to evaluate nerve regeneration. Both techniques presented great variability in nervous tissue, though some animals showed satisfactory results. Different intensities of scarring processes might have interfered with nerve regeneration. Although IOVG and IOAG techniques showed similar morphometric results, in general, IOVG presented a closer-to-normal nerve organization than IOAG.

Mesoscopy and scanning electron microscopy of the trabecular projections in the superior sagittal sinus

The trabecular projections of the human superior sagittal sinus were classified into types and subtypes according to spatial arrangement and shape. The horizontal and vertical projections direct laminar blood flow, while the conic type, which is avalvular, protects the openings of the superior cerebral veins in the superior sagittal sinus. Copyright (C) 2003 S. Karger AG, Basel.

Orchidectomy enhances the effects of phenylephrine in rat isolated portal vein

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

New Brazilian species of Endecous Saussure, 1878: Phallic sclerites, calling song and tegmen morphometry (Orthoptera: Grylloidea: Phalangopsinae)

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

The late precambrian K-alkaline magmatism in the Ribeira Fold Belt: a case study of the Piracaia Pluton, State of São Paulo, SE Brazil, and its potential mineralization (Cu, Zn, Gd)

The Pluriserial Ribeira Magmatic System-590 of the Late Precambrian Ribeira Fold Belt comprises seven groups of high-K rocks of crustal or mantle origin with ages ranging between 620 and 570 Ma. One of these groups is represented by transalkaline suites akin to appinitic lamprophyres. The suites assemble one or more of following lithologies: (+/- quartz) gabbros and monzogabbros, (+/- quartz) diorites and monzodiorites, (+/- quartz) monzonites and syenites in addition to rare granites. All these rocks occur together in the Piracaia pluton, State of São Paulo. The mineralogy of the Piracaia suite comprises variable amounts of plagioclase (An 60-10), alkali-feldspars (orthoclase, microcline, albite), ortho- (Fe-hypersthene) and clinopyroxenes (augite), amphiboles (hornblende and rare late Fe-hastingsite), abundant biotite, quartz, opaques, sphene, allanite and zircon. Several magmatic pulses constructed the pluton. The Piracaia magma bulk trend evolved initially along the silica-undersaturation plane with simultaneous fractionation of accessory, mafic and felsic minerals. These are segregated in feldspar-rich cumulates. In the late stage, the evolutionary trend followed two distinct paths: one along the or-ab thermal barrier with the crystallization of syenites; the second one along the thermal valley in the or-ab-qz subsystem, producing quartz-syenites and granites. The source of the Piracaia magma was a 'vein-plus-wall-rock-system '. Together the pulses reflect increasing and decreasing participation of peridotites and mica pyroxenites, respectively, in the magmatogenic process. The magmatic pulses were stored in magma chambers, several drained by deep faults or fractures, which were successively reactivated and recharged. Each new pulse underwent mixing with earlier residual magma, followed by fractionation. During ascent through the hot and thickened post-collisional crust, the magma pulses underwent minor compositional changes by crustal contamination. The concentration of valuable elements (Cu, Zn, Gd) in the Piracaia pluton occurred during two phases of the magmatic evolution. Cu and Zn were enriched in cumulates and Gd was concentrated in residual quartz-syenitic veins. Due to their homogeneous dark colour and texture, the monzodiorites are exploited both for polished dimension stones and supports for sensitive scientific instruments. (C) 2001 Elsevier B.V. Ltd. All rights reserved.

Nutrição mineral do mamoeiro (Carica papaya L.): II - deficiência de boro em condições de campo e casa de vegetação

Com o objetivo de caracterizar a deficiência de boro no mamoeiro (Carica papaya L.) em condições de casa de vegetação e correlacionar com o problema que ocorre em condições de campo, conhecido como careca do mamoeiro ou queda do chapéu, foram instalados dois ensaios. O primeiro foi conduzido em condições de campo no município de Botucatu, SP., em um solo pertencente ao grande grupo Terra Roxa Estruturada e de clima Cf.b.. O segundo ensaio foi conduzido em condições de casa de vegetação e soluções nutritivas. Os autores descrevem os sintomas de deficiência de boro em mamoeiro e correlacionam o problema conhecido como careca do mamoeiro, com a deficiência de boro.

Anatomy, ultrastructure and secretion of Hibiscus pernambucensis Arruda (Malvaceae) extrafloral nectary

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

Angioarquitetura venosa do órgão genital da fêmea bovina

Investigou-se a angioarquitetura venosa da genitália de fêmeas bovinas não prenhes, para avaliar a presença de possíveis anastomoses dos vasos provenientes da região da vulva e da vagina com a veia útero-ovariana, usando-se cinco peças obtidas em abatedouros. No laboratório, um ramo da veia vaginal caudal, infundido com contraste radiográfico intravascular, foi submetido à radiografia. Observou-se que a veia vaginal forma intensa rede de anastomoses na superfície ventral do útero, entre os antímeros direito e esquerdo. As genitálias apresentaram anastomoses dos vasos vulvares e vaginais com vasos da cérvice, corpo e cornos uterinos, sugerindo que parte de um agente luteolítico administrado via intravulvosubmucosa pode ser transportado diretamente aos ovários por uma rota local, sem atingir a circulação sistêmica.

Vascularização foliar e anatomia do pecíolo de Melastomataceae do cerrado do Estado de São Paulo, Brasil

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Morfologia foliar de Theobroma grandiflorum Schum

As folhas de Theobroma grandiflorum Schum. são morfologicamente descritas. A espécie apresenta elementos histológicos comuns para a família, destacando-se tipos de tricomas, estômatos e contornos das células epidérmicas em visão frontal. Empregou-se microscopia eletrônica de varredura para a caracterização de segmentos foliares jovens, em que ficou evidenciada a presença de tricomas estrelados nas superfícies adaxial e abaxial dos mesmos. As folhas de cupuaçu são hipoestomáticas com número elevado de estômatos anomocíticos. As nervuras principais apresentaram-se desprovidas de tricomas, com estômatos esparsamente distribuídos.

Apresentação pediátrica da síndrome antifosfolípide

OBJETIVO: Descrever as características clínicas, laboratoriais e de desfecho de uma série de casos com diagnóstico definido de síndrome antifosfolípide (SAF) pediátrica. MÉTODOS: Estudo observacional-retrospectivo de referência pediátrica terciária, que identificou os casos por meio de evento vascular, trombose venosa ou oclusão arterial, determinação de anticorpos anticardiolipina (IgG e IgM) e teste do anticoagulante lúpico. RESULTADOS: Foram identificados cinco casos atendidos nos últimos cinco anos, sendo dois meninos e três meninas. A trombose venosa ocorreu em seios venosos cerebrais (2), fibular (2), poplítea (1), femoral (1), intestinal (1), renal (1), acompanhados por oclusão arterial intestinal (1), de artéria renal (1) e artéria digital (1), esta resultando gangrena periférica como evento recorrente durante anticoagulação com warfarina. Um abortamento espontâneo ocorreu em uma adolescente em vigência de púrpura trombocitopênica, evoluindo com anemia hemolítica (síndrome de Evans) e desfecho fatal por hemorragia. A investigação laboratorial em todos os casos resultou, pelo menos, uma determinação positiva de anticardiolipina IgG e/ou IgM, sendo considerados como SAF primária. Três dos casos estão em seguimento com anticoagulação oral. CONLUSÃO: A trombose venosa cerebral e de extremidades foram os eventos mais freqüentes. A presente série alerta para a investigação e o diagnóstico precoces, com abordagem multidisciplinar para o tratamento.