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Vol. 10 omitted in volume numbering

Arkiv för zoologi /

"The publication of Öfversigt af K. Vetenskaps-akademiens förhandlingar and Bihang til K. Svenska vetenskaps-akademiens handlingar ... will not be continued. A yearbook and four publications will be published instead. These four publications are named: Arkiv för matematik ... Arkiv för kemi ... Arkiv för botanik, Arkiv för zoologi."

A Geophysical Investigation of the Arctic Sea Ice Surface

Thesis (Ph.D.)--University of Washington, 2016-06

Histological analysis of gallbladder diseases in relation to opisthorchiasis in endemic areas of Thailand

Chronic gallbladder disease frequently accompanies infection with the liver fluke, Opisthorchis viverrini, in Northeast Thailand. However, the pathology and pathogenesis of the gallbladder disease have not been described. Accordingly, gallbladder specimens from 187 consecutive patients who had undergone cholecystectomy at a referral hospital in an endemic area in Thailand were histologically characterized in relation to O. viverrini infection. The infection was assessed by the presence of parasite eggs in the bile and/or antibody response to the liver fluke. The average level of parasite-specific IgG was significantly higher in patients with Opisthorchis eggs in the bile than those without (P < 0.001). The main histopathologic features of the gallbladder included inflammation, mucosal atrophy/or hyperplasia, goblet cell metaplasia, mucous gland hyperplasia, Rokitansky-Aschoff sinus formation, dysplasia and fibrosis. The fibrosis was strongly associated with elevated levels of Opisthorchis-specific antibody (P < 0.001) but not with the presence of parasite eggs. Other pathologic features did not vary in frequency or severity with parasitological status. Our results show that severe fibrosis of the gallbladder is a more common histologic feature of cholecystitis among those with O. viverrini infection compared to those without infection. The close relationship between parasite-specific IgG and severe fibrosis suggests that specific immune response to the parasite play an important role in the pathogenesis of the fibrotic change. (C) 2003 Elsevier B.V. All rights reserved.

Acute bovine laminitis: A new induction model using alimentary oligofructose overload

Twelve dairy heifers were used to examine the clinical response of an alimentary oligofructose overload. Six animals were divided into 3 subgroups, and each was given a bolus dose of 13, 17, or 21 g/kg of oligofructose orally. The control group (n = 6) was sham-treated with tap water. Signs of lameness, cardiovascular function, and gastrointestinal function were monitored every 6 h during development of rumen acidosis. The heifers were euthanized 48 and 72 h after administration of oligofructose. All animals given oligofructose developed depression, anorexia, and diarrhea 9 to 39 h after receiving oligofructose. By 33 to 45 h after treatment, the feces returned to normal consistency and the heifers began eating again. Animals given oligofructose developed transient fever, severe metabolic acidosis, and moderate dehydration, which were alleviated by supportive therapy. Four of 6 animals given oligofructose displayed clinical signs of laminitis starting 39 to 45 h after receiving oligofructose and lasting until euthanasia. The lameness was obvious, but could easily be overlooked by the untrained eye, because the heifers continued to stand and walk, and did not interrupt their eating behavior. No positive pain reactions or lameness were seen in control animals. Based on these results, we conclude that an alimentary oligofructose overload is able to induce signs of acute laminitis in cattle. This model offers a new method, which can be used in further investigation of the pathogenesis and pathophysiology of bovine laminitis.

Neogenin: A multi-functional receptor regulating diverse developmental processes

Neogenin, a close relative of the axon guidance receptor Deleted in Colorectal Cancer (DCC), has been shown to be a receptor for members of the Netrin and Repulsive Guidance Molecule (RGM) families. While Netrin-l-Neogenin interactions result in a chernoattractive axon guidance response, the interaction between Neogenin and RGMa induces a chemorepulsive response. Evidence is now accumulating that Neogenin is a multi-functional receptor regulating many diverse developmental processes, including neural tube and mammary gland formation, myogenesis and angiogenesis. Little is known of the function of Neogenin in the adult, however, a novel role in the regulation of iron homeostasis is now emerging. While the signal transduction pathways activated by Neogenin are poorly understood, it is clear that the functional outcome of Neogenin activation, at least in the embryo, depends on both the developmental context as well as the nature of the ligand. (c) 2006 Elsevier Ltd. All rights reserved.

EDUCAÇÃO MUSICAL: UM ESTUDO A PARTIR DOS PCN-ARTE E DA PERSPECTIVA DE PROFESSORES POLIVALENTES DO ENSINO FUNDAMENTAL

A fruição artística por meio da música é um modo privilegiado de conhecimento e aproximação entre indivíduos de culturas distintas. A música pode enriquecer o trabalho pedagógico, facilitando a compreensão dos fatos históricos e atuando na formação de sujeitos críticos e conscientes, agentes de seu próprio conhecimento, em um plano que vai além do discurso verbal. A área de música tem uma função importante a cumprir. A música situa o fazer artístico do homem histórico brasileiro, que conhece suas características tanto particulares, tal como se mostram na criação de uma arte brasileira, quanto universais, tal como se revelam no ponto de encontro do fazer dos artistas de todos os tempos, que sempre inauguram formas de tornar o presente explicável. Pode-se concluir da importância da música na prática escolar, que deve ter espaço garantido nas políticas educacionais. O objetivo desta pesquisa, nessa perspectiva, é verificar as recomendações dos Parâmetros Curriculares Nacionais (PCN-Arte) fazem quanto ao estudo da música e em que medida tais recomendações se expressam na prática educacional de escolas de Ensino Fundamental. Para tanto, explora-se, como referencial teórico escolhido, os estudos de Montanari (1988) e Barbosa (1983). É uma pesquisa de natureza qualitativa e se desenvolve por meio de estudos bibliográficos relacionados à temática, incluindo o PCN-Arte, e também da coleta de dados entre professores polivalentes. Os dados obtidos são objeto de análise de conteúdo, de acordo com as orientações de Szymanski, Almeida & Prandini (2004), sendo que as categorias examinadas emergiram dos depoimentos dos entrevistados. O estudo enfatiza o quanto é preciso avançar nas políticas educacionais em nosso País.

CENTROS EDUCACIONAIS UNIFICADOS DE SÃO PAULO: IMPLEMENTAÇÃO E CONTINUIDADE NUMA NOVA GESTÃO POLÍTICA

Este estudo tem como objetivo verificar se a política educacional do CEU: Centro Educacional Unificado criado e implementado no governo Municipal de Marta Suplicy também apresentado como uma proposta contra-hegemônica de escola inclusiva e cidadã, ainda existe nesta atual administração. Apresenta e identifica os princípios do projeto CEU, bem como suas principais diferenças dentro de duas perspectivas políticas: uma progressista e outra mais conservadora. Com a transição da administração publica através da posse do prefeito eleito José Serra e continuada com o exercício do vice-prefeito Gilberto Kassab, os CEUs ficam sujeitos às mudanças técnico- administrativas e políticas, tornando necessária a análise da continuidade e da auto sustentabilidade destes complexos educacionais face ao alto investimento dos recursos públicos demandados em sua implementação. Apresenta-se um estudo bibliográfico sobre a política neoliberal em educação e também aos documentos oficiais da Rede Municipal de São Paulo. Por meio da pesquisa empírica com protagonista do projeto foram observadas as principais diferenças objetivando a análise do processo instituinte.

SER-PROFESSOR: construção de identidade em processo autoformativo

Este estudo teve por objetivo analisar como o ser-professor se narra e interpretase como sujeito na profissão, tendo em vista compreender de que maneira esse profissional constrói a identidade pessoal/profissional, sendo capaz de afirmar-se ou negar-se como sujeito dentro do sistema-escola? Trata-se de uma pesquisa realizada com educadores de 1º e 2º ano do ciclo I e II do Ensino Fundamental da Rede Pública de São Bernardo do Campo e Mestrandos em Educação. Optou-se por entrevistar seis educadores, de diferentes áreas de ensino, tornando-os autores desta pesquisa. A abordagem metodológica de cunho qualitativo foi utilizadas priorizando a narrativa dos educadores. Para esta metodologia recorreu-se às contribuições de Maria Isabel Cunha; Lüdke; André; Connelly e Clandini que explicitam sobre a importância de trabalhar com essa metodologia na perspectiva de interpretar e compreender a construção da identidade docente, sobretudo, na linha Formação de Educadores. A temática formação docente e construção da identidade foi trazida à luz dos estudos de Pimenta; Brzezinski; Freire; Vianna; Lane; Sung; Nóvoa; Ciampa, entre outros. No âmbito da análise, foram priorizadas algumas categorias ao longo desta temática: razões que levaram à escolha da profissão; percepções que o professor tem de sujeito na profissão; condições de ser e estar na profissão ; sistema e construção da identidade: condições de se sujeitar para se auto-afirmar como sujeito profissional. No trato destas categorias e, ao longo desta pesquisa, foram consideradas as percepções dos professores, como sendo elementos valiosos para identificar da construção de identidade docente. Estas considerações fundam-se no aporte teórico-metodológico que apresentam grandes contribuições referentes à temática. A partir daí, são estabelecidas relações entre Psicologia Social e Sociologia que possibilitam identificar nas narrativas dos educadores uma insatisfação perante o sistema. Alguns professores partem do próprio sentimento ao narrar todo desconforto que as instituições propiciam-lhes; outros enfatizam de modo objetivo seu cotidiano, contornando e explicitando diferenças na condição de ser estar na profissão .

Sequential grouping of pure-tone percepts evoked by the segregation of components from a complex tone

A sudden change applied to a single component can cause its segregation from an ongoing complex tone as a pure-tone-like percept. Three experiments examined whether such pure-tone-like percepts are organized into streams by extending the research of Bregman and Rudnicky (1975). Those authors found that listeners struggled to identify the presentation order of 2 pure-tone targets of different frequency when they were flanked by 2 lower frequency “distractors.” Adding a series of matched-frequency “captor” tones, however, improved performance by pulling the distractors into a separate stream from the targets. In the current study, sequences of discrete pure tones were substituted by sequences of brief changes applied to an otherwise constant 1.2-s complex tone. Pure-tone-like percepts were evoked by applying 6-dB increments to individual components of a complex comprising harmonics 1–7 of 300 Hz (Experiment 1) or 0.5-ms changes in interaural time difference to individual components of a log-spaced complex (range 160–905 Hz; Experiment 2). Results were consistent with the earlier study, providing clear evidence that pure-tone-like percepts are organized into streams. Experiment 3 adapted Experiment 1 by presenting a global amplitude increment either synchronous with, or just after, the last captor prior to the 1st distractor. In the former case, for which there was no pure-tone-like percept corresponding to that captor, the captor sequence did not aid performance to the same extent as previously. It is concluded that this change to the captor-tone stream partially resets the stream-formation process, and so the distractors and targets became likely to integrate once more. (PsycINFO Database Record (c) 2011 APA, all rights reserved)

Mechanisms of drying of skin forming materials

The literature relating to evaporation from single droplets of pure liquids, and to the drying of droplets containing solids and of droplet sprays has been reviewed. The heat and mass transfer rates for a single droplet suspended from a nozzle were studied within a 42mm I.D. horizontal wind tunnel designed to supply hot dry air, to simulate conditions encountered in a practical spray dryer. A novel rotating glass nozzle was developed to facilitate direct measurements of droplet weight and core temperature. This design minimised heat conduction through the nozzle. Revised correlations were obtained for heat and mass transfer coefficients, for evaporation from pure water droplets suspended from a rotating nozzle. Nu = 2.0 + 0.27 (l/B)°-18Re°-5Pr°-83 Sh = 2.0 + 0.575 ((T0-T.)/Tomfc) -o.o4Reo.5 ^0.33 Experimental drying studies were carried out on single droplets of different types of skin-forming materials, namely, custard, gelatin, skim milk and fructose at air temperatures ranging from 19°C to 198°C. Dried crusts were recovered and examined by Scanning Electron Microscopy. Skin-forming materials were classified into three types according to the mechanisms of skin formation. In the first type (typified by droplets of custard and starch) skin formed due to gelatinisation at high temperatures. Increasing the drying temperature resulted in increased crust resistance to mass transfer due to increased granule swelling and the crust resistance was completely transferred to a skin resistance at drying temperatures > 150°C. In the second type e.g. gelatin droplets the skin formed immediately drying had taken place at any drying temperature. At drying temperature > 60° C a more resistant skin was formed. In the third type (typified by droplets of skim milk and fructose) the skin appeared on the droplet surface at a certain stage of the drying process under any drying conditions. As the drying temperature was increased the resistance of the skin to mass transfer increased. The drying rate history of any material depended upon the nature of the skin formed which, in turn, depended upon the drying conditions. A mathematical model was proposed for the drying of the first type of skin-forming material. This was based on the assumption that, once all the granules gelatinised at the gelatinisation temperature, a skin appeared instantaneously on the droplet surface. The experimentally-observed times at which the skin appeared on the droplets surfaces were in excellent agreement with those predicted from the model. The work should assist in understanding the fundamentals of paniculate drying processes, particularly when skin-formation occurs and may be a crucial factor in volatiles retention.

A study of liquid-liquid extraction in a sieve plate column

The literature relating to sieve plate liquid extraction columns and relevant hydrodynamic phenomena have been surveyed. Mass transfer characteristics during drop formation, rise and coalescence, and related models were also reviewed. Important design parameters i.e. flooding, dispersed phase hold-up, drop size distribution, mean drop size, coalescence/flocculation zone height beneath a plate and jetting phenomena were investigated under non-mass transfer and mass transfer conditions in a 0.45m diameter, 2.3m high sieve plate column. This column had provision for four different plate designs, and variable plate spacing and downcomer heights, and the system used was Clairsol `350' (dispersed) - acetone - deionised water (continuous) with either direction of mass transfer. Drop size distributions were best described by the functions proposed by Gal-or, and then Mugele-Evans. Using data from this study and the literature, correlations were developed for dispersed phase hold-up, mean drop size in the preferred jetting regime and in the non-jetting regime, and coalescence zone height. A method to calculate the theoretical overall mass transfer coefficient allowing for the range of drop sizes encountered in the column gave the best fit to experimental data. This applied the drop size distribution diagram to estimate the volume percentage of stagnant, circulating and oscillating drops in the drop population. The overall coefficient Kcal was then calculated as the fractional sum of the predicted individual single drop coefficients and their proportion in the drop population. In a comparison between the experimental and calculated overall mass transfer coefficients for cases in which all the drops were in the oscillating regime (i.e. 6.35mm hole size plate), and for transfer from the dispersed(d) to continuous(c) phase, the film coefficient kd predicted from the Rose-Kintner correlation together with kc from that of Garner-Tayeban gave the best representation. Droplets from the 3.175mm hole size plate, were of a size to be mainly circulating and oscillating; a combination of kd from the Kronig-Brink (circulating) and Rose-Kintner (oscillating) correlations with the respective kc gave the best agreement. The optimum operating conditions for the SPC were identified and a procedure proposed for design from basic single drop data.

Volcanogenic mineralisation in the limestone lake area, Saskatchewan, Canada

This thesis describes the geology, geochemistry and mineralogy of a Lower Proterozoic, metamorphosed volcanogenic Cu-Zn deposit, situated at the western end of the Flin Flon greenstone belt. Stratabound copper mineralisation occurs in silicified and chloritoid-bearing alteration assemblages within felsic tuffs and is mantled by thin (< 3m) high-grade sphalerite layers. Mineralisation is underlain by garnet-hornblende bearing Lower Iron Formation (LIF), and overlain by garnet-grunerite bearing Upper Iron Formation (UIF). Distinctive trace element trends, involving Ti and Zr, in mineralised and footwall felsic tuffs are interpreted to have formed by fractionation associated with a high-level magma chamber in a caldera-type environment. Discrimination diagrams for basaltic rocks are interpreted to indicate their formation in an environment similar to that of recent, primitive, tholeiitic island arcs. Microprobe studies of key mineral phases demonstrate large and small scale chemical variations in silicate phases related to primary lithological, rather than metamorphic, controls. LIF is characterised by alumino-ferro-tschermakite and relatively Mn-poor, Ca-rich garnets, whereas UIF contains manganoan grunerite and Mn-rich garnets. Metamorphic mineral reactions are considered and possible precursor assemblages identified for garnet-, and chloritoid-bearing rocks. Chloritoid-bearing rocks are interpreted as the metamorphosed equivalents of iron-rich feeder zones formed near the surface. The iron-formations are thought to represent iron-rich sediments formed on the sea floor formed from the venting of the ore fluids. Consideration of various mineral assemblages leads to an estimate for peak metamorphic conditions of 450-500oC and > 4Kb total pressure. Comparisons with other volcanogenic deposits indicate affinities with deposits of `Mattabi-type' from the Archean of Ontario. An extrapolation of the main conclusions of the thesis to adjacent areas points to the presence of a number of geologically similar localities with potential for mineralisation.

Travelling waves in a complex Ginzburg-Landau equation with time-delay feedback

One of the simplest ways to create nonlinear oscillations is the Hopf bifurcation. The spatiotemporal dynamics observed in an extended medium with diffusion (e.g., a chemical reaction) undergoing this bifurcation is governed by the complex Ginzburg-Landau equation, one of the best-studied generic models for pattern formation, where besides uniform oscillations, spiral waves, coherent structures and turbulence are found. The presence of time delay terms in this equation changes the pattern formation scenario, and different kind of travelling waves have been reported. In particular, we study the complex Ginzburg-Landau equation that contains local and global time-delay feedback terms. We focus our attention on plane wave solutions in this model. The first novel result is the derivation of the plane wave solution in the presence of time-delay feedback with global and local contributions. The second and more important result of this study consists of a linear stability analysis of plane waves in that model. Evaluation of the eigenvalue equation does not show stabilisation of plane waves for the parameters studied. We discuss these results and compare to results of other models.