Showing papers by "Universidade Federal de Santa Catarina published in 1986"

Turbulent thermal convection in wide horizontal fluid layers

Abstract: Turbulence in thermal convection is investigated for flows in which the production of turbulence energy is due solely to buoyancy, and the statistics of the flow are homogeneous in horizontal planes. New experimental results for high Rayleigh number unsteady turbulent convection in a horizontal layer heated from below and insulated from above are presented and compared to turbulent Rayleigh convection, convection in the planetary boundary layer, and laboratory penetrative convection. Mean temperature fields are correlated in terms of wall layer scales and convection scales. Joint statistics of turbulent temperature and horizontal velocity and vertical velocity through fourth order are presented for the core region of the convection layer.

Phase diagrams of the decylammonium chloride/ammonium chloride/water system in the nematic micellar region

Abstract: Phase diagrams were obtained as a function of temperature and surfactant concentration for the decylammonium chloride (DACl)-water binary system and for ternary systems containing 1:1627, 1:20, and 1:10 weight ratios of NH 4 Cl:DACl. The binary system presents the usual hexagonal (middle soap), lamellar (neat soap), isotropic, and “coagel” phases as well as a micellar nematic of the disk type. The addition of NH 4 Cl greatly inhibits the formation of the hexagonal phase, and increases the size of the nematic and lamellar regions while shifting them toward higher temperatures. As the concentration of NH 4 Cl to DACl passes 7 wt% (for 45 wt% DACl), the nematic is replaced by a lamellar-isotropic two-phase region.

In vitro effects of calcium entry blockers, chlorpromazine and fenoterol upon human pregnant myometrium contractility

Abstract: The inhibitory effects of nifedipine, verapamil, cinnarizine (calcium entry blockers), chlorpromazine (a putative calmodulin antagonist) and fenoterol (a beta 2-adrenoceptor agonist) on contractility in human isolated pregnant myometrium were studied. Spontaneous contractions (present in 93% of the preparations) were inhibited in a concentration-related manner by these compounds in the following order of potency: nifedipine greater than verapamil much greater than cinnarizine greater than chlorpromazine. Cinnarizine was effective only at a concentration greater than 100 microM. Fenoterol, at 10 microM, did not produce an inhibitory effect but decreased the frequency of spontaneous contractions. All drugs, except fenoterol, produced a concentration-dependent relaxation of K+-induced contractions in the following order of sensitivity: nifedipine greater than verapamil much greater than chlorpromazine. Cinnarizine produced only about 40% of relaxation. Under these conditions nifedipine and verapamil were about 80 and 5 fold more potent respectively than when tested against spontaneous contractions. The potencies of chlorpromazine and cinnarizine did not differ in the two experimental conditions. Both the spontaneous and K+-induced contractions were inhibited in a time-dependent manner in Ca2+-free media and the responses were almost completely abolished in 70-100 min. Calcium addition to the medium rapidly restored both spontaneous or K+-induced contractions. To investigate further the role of intracellular calcium, K+-depolarized preparations contracted by calcium 3 mM (40-60% of maximal contractions) were relaxed by these compounds. Nifedipine and verapamil showed a relaxation time course similar to that induced by calcium removal. Cinnarizine and fenoterol had no relaxant effect while chlorpromazine induced a slight and slow relaxation. 6 These findings suggest that calcium influx and calmodulin are involved in spontaneous contractions of pregnant human myometrium in vitro. Since nifedipine and verapamil were more potent against K+-induced than spontaneous contractions, calcium channels activated by these conditions could be different. Finally, fenoterol, a beta 2-adrenoceptor agonist, widely used as a tocolytic agent, blocked neither spontaneous nor K+-induced contractions.

Effect of a crude extract of Mandevilla velutina on contractions induced by bradykinin and [des-Arg9]-bradykinin in isolated vessels of the rabbit.

Abstract: 1 The effect of a crude aqueous/alcoholic extract of Mandevilla velutina on the contractile responses induced by bradykinin (Bk), [des-Arg9]-Bk and noradrenaline (NA) in rings of arterial and venous rabbit vessels was analysed. 2 The contractile responses induced by Bk, [des-Arg9]-Bk differed between the rings of the aorta, jugular and mesenteric veins. Rings of the aorta and mesenteric vein were stimulated by both peptides, but were more sensitive to [des-Arg9]-Bk. The jugular vein was not only more sensitive to Bk but also did not respond to [des-Arg9]-Bk, even in the presence of a high concentration of this peptide. 3 Pre-incubation for 20 min with the crude extract of Mandevilla velutina rhizomes (1 mg ml−1) antagonized the contractions produced by both peptides. This blockade was surmountable by about a 10–30 fold increase in the concentration of both Bk and [des-Arg9]-Bk. In the aorta and mesenteric vein the NA-induced contractions were not affected by 1 mg ml−1 of the extract. 4 Bk (1 to 100 nm) caused a concentration-related contractile response in rings of the rabbit jugular vein. Incubation for 20 min with the crude extract (0.25−1 mg ml−1) caused a concentration-dependent displacement to the right of the Bk concentration-response curves and depressed the maximal response. 5 The onset of action of the crude extract was rapid and was reversible after intermittent washing of the preparations for 30–60 min. 6 These findings confirm and extend our previous work and indicate that the crude extract of Mandevilla velutina selectively antagonizes the action of Bk and related peptides on both B1- and B2-receptors present in rabbit vascular muscle.

Estudo taxonômico do gênero Tibouchina Aubl. (Melastomataceae) no Rio Grande do Sul - Brasil

Abstract: Este trabalho consiste num estudo taxonomico do genero Tibouchina Aubl. (Melastomataceae) no estado do Rio Grande do Sul. Analisamos exsicatas de diversos herbarios brasileiros e argentinos, bem como material "in vivo", observado em excursoes realizadas nas diversas regioes fisiograficas deste estado. Fizemos uma revisao bibliografica para este genero, com as principais obras obtidas. Apresentamos chaves para determinacao dos generos de Melastomataceae e para as especies de Tibouchina do Rio Grande do Sul. Foram encontradas, ate o momento, neste estado, 17 especies do genero Tibouchina : T. asperior (Cham.) Cogn., T. cerastifolia (Naud.) Cogn., T. cisplatensis Cogn., T. clinopodifoia (DC.) Cogn., T. debilis (Cham.) Cogn., T. dubia (Cham.) Cogn., T. gracilis (Bonpl.) Cogn., T. herbacea (DC.) Cogn., T. hospita (DC.) Cogn., T. longipilosa Cogn., T. ramboi Brade, T. rupestris Cogn., T. sellowiana (Cham.) Cogn., T. trichopoda (DC.) Baill., T. urbanii Cogn., T. urvilleana (DC.) Cogn. e T. versicolor (Lindl.) Cogn., T. longipilosa e T. urbanii sao citadas, aqui, pela primeira vez para este estado. Para cada especie, fizemos descricao, comentarios, ilustracoes e mapa de distribuicao das coletas.

Caracterização ultra-estrutural de espermatozoides eupirenes e apirenes de Alabama argillacea Hubner, 1818 (lepidoptera, Noctuidae), ao nivel de testiculo edas vias genitais dos imagos macho e femea ate a espermateca

Abstract: Dissertacao (mestrado) - Universidade Estadual de Campinas, Departamento de Biologia Celular

Tripomastigota muito largo como padrão morfológico de cepas do Trypanosoma cruzi do extremo Sul do Brasil

Abstract: The morphological patterns of boold trupomastigotes from live sylvatic trypanosoma cruzi strains from Santa Catarina, South Brazil, were studied during thse course of infection in experimentally infected mice. A predominance of stout trypomastigotes (> 70%) was observed during all over the acute phase in four strains of medium virulence. With the remaining strain, of high virulence, the slender forms predominating at the early infection stage were soon also replaced by stout forms. Since almost all T. cruzistrains displaying predominance of this peculiar morphological pattern have been isolated in South Brazil (Rio Grande do Sul, Santa Catarina) and since there are evidences pointing out to the existence of biological differences among these distinct boold parasites, the authors suggest further investigations of possibel correlations between the morphological markers and clinical-epidemiological aspects of Chagas' disease.

English phonetics and phonology (Peter Roach)

Abstract: Th i s i s a co urse c aus e s a nd r eme d i e s o f th e s e book des igned t o be use d by un i ve r s it y s t udent s o f Eng l is h ei t her in t he fi na l s eme s t e rs of underg r adu ate study or .l u r , i ng a gr a dua te p rogram . I t is j us t wha t the t i t le s 3ys a p r act ical co u rse boo k in bas i c Engl i s h pho net i c s an d phono l ogy a imed a t tr ai nin g t he s t ude n t o r (fu t u r e) t e a ch er t o det ect h i s /h er own p r on un c i a ti on err o rs or th os e o f (fu t ure ) stu de nts , a nd t o re cogn ize t he e r r ors . One of t he s tron g po in t s of t he book i s i ts read abi li t y -exp lana tio ns are c l e a r and co nc i se , wi t hou t an ov e rlo ad of unnecessar y t e c hn i cal det ai l. Pr e vi ou s knowlcdvc of phone t ics or phono lo gy is not ne ces sary, a s a l l essen t i a l co nce p t s and voca b~ l a r y are ex p l a i ne d when needed to unders ta nd a rticu la t ory p r oce ss e s . Where othe r writers

Trabalho feminino, trabalho improdutivo?

Abstract: 0 trabalho feminino no lar em geral não 6 valorizado. Embora se de importância ao papel desempenhado pela mulher, como reprodutora biolOgica, seu serviço freqüentemente nem 6 considerado como tal. Ela prOpria, quando perguntada se trabalha,muitas vezes responde que não, que sé cuida das lidas da casa e dos filhos. De qualquer forma, mesmo quando os afazeres domésticos são considerados trabalho, não assumem a importância atribuida ao trabalho fora do lar. E quando a mulher, pressionada por fatores econômicos, entra no mercado de trabalho, em geral o faz com as desvantagens amplamente denunciadas pelos estudos a respeito do assunto, com menor salário para igual função, difícil acesso aos cargos de decisão, entre outras.

As belezas do arco-íris e seus segredos

Abstract: O arco-iris e certamente um dos fenomenos mais belos da natureza. Com isso concordam fisicos, artistas, cientistas e nao cientistas. O objetivo deste artigo e fornecer ao observador dos fenomenos atmosferi-cos, em particular do arco-iris, uma explicacao de suas caracteristicas mais evidentes e tambem de outras mais sutis, para que estas possam ser futura-mente observadas. As caracteristicas de um arco-iris que mais se destacam sao a sua forma curva (dai seu nome arco-iris), e seu espetaculo de cores. Por que e como isso pode ser explicado? Inicialmente e preciso notar que o arco-iris e produzido por gotas de chuva que desviam parte da luz solar em direcao aos nossos olhos. Podemos simplificar a analise nos restringindo ao estudo do desvio (ou espalhamento, falando em linguagem tecnica) da luz em uma gota d'agua, que produz ela sozinha um arco-iris. Teodorico de Freiberg, em 1304, construiu uma esfera de vidro, preencheu-a com agua e estudou o desvio da luz atraves dela. Tre-zentos anos depois, Descartes, usando tambem esse procedimento, redes-cobriu o mesmo. Os dois experimentadores notaram que podiam perceber somente uma cor do arco-iris por veze que, ao deslocarem seus olhos, pas-savam a perceber outras cores. Isto os levou a conclusao de que o conjunto de cores observadas normalmente e proveniente de varias gotas de chuva diferentes e cada gota espalha apenas uma cor por vez. Outro detalhe significativo e o ângulo determinado pelo Sol, pelo observador e pelas gotas que originam o arco-iris principal (as vezes, ocorrem dois arco-iris). Roger Bacon, em 1226, mediu esse ângulo para o arco-iris primario e obteve 42o e para o secundario 50o (vide Fig. 1). Isto significa que somente podemos observar arco-iris a nossa frente quan-do damos as costas para o Sol e que portanto so podemos perceber esse fenomeno perto do nascer e do por-do-sol (voce ja reparou nisto?).

Methylnalorphinium fails to reverse naloxone-sensitive stress-induced analgesia in mice.

Abstract: Exposure of mice to cold-restraint stress markedly decreased the number of abdominal constrictions induced by IP acetic acid. Naloxone pretreatment significantly attenuated the antinociceptive effect of cold-restraint stress, suggesting a partial mediation by opioid mechanisms. Pretreatment with the quaternary opioid antagonist methylnalorphinium did not reverse analgesia in stressed mice. Also, nociception in both stressed and non-stressed mice was not modified by pretreatment with the selective α2-adrenococeptor blocker yohimbine. The results suggest that cold-restraint stress promotes analgesia in mice which is mediated in part by opioid but not α2-adrenoceptor mechanisms. Furthermore, the results do not substantiate a peripheral analgesic role for circulating opioids in this model of stress.

Realidade do ensino de História: a formação teórica, base para a prática pedagógica?

Abstract: Este estudio analiza las informaciones colectadas durante la investigacion realizada en el Estado de Santa Catarina en el periodo de abril a junio de 1984 junto a 140 profesores de la escuela publica estadual. Este estudio considera basicamente la cuestion de la formacion teorica del profesor entendida aqui como la formacion, recebida en la ensenanza superior y la posibilidad de fundamentacion de esta formacion para la practica pedagogica. El analisis de las informaciones obtenidas durante la aplicacion de la investigacion mostro que la gran mayoria de los profesores que actuan en la escuela publica elemental y secundaria "no esta satisfecha" con la formacion teorica recibida en la ensenanza superior porque, segun estos profesores, esta formacion "no satisface y no da fundamentacion para la practica pedagogicas". Estos determinantes posibilitaron la reflexion sobre las posiciones de los profesores en cuanto al nivel de preparacion que juzgaron haber obtenido y/o estar obteniendo en la ensenanza superior en las disciplinas de instrumentalizacion de la Ciencia y de la Pedagogia. Considerando los cuestionamientos planteados por profesores en relacion a la insuficiencia de la formacion teorica obtenida en la ensenanza superior busco llamar allector a una reflexion en el sentido de buscar alternativas para "mejorar" la cuestion de la formacion teorica y practica pedagogica.

Osmosedimentation Methods: Preparative and Analytical Applications

Abstract: Mass transfer occurs in every uniform, many-component system. The net result of submitted to a gravitational or inertial field. this mass transfer is a lowering of the mass center of the system and the concurrent formation of concentration gradients. The Lower-density components move upwards, the higher density components move downwards, until every component reaches a uniform chemical potential, throughout the system.

Terminologia brasileira em ciência da informação: uma análise

Abstract: Aplica metodologia e principios da Terminologia no levantamento e analise da terminologia brasileira em Ciencia da Informacao. Identifica, a partir da coleta de termos realizada na revista Ciencia da Informacao e no Catalogo de Teses e Dissertacoes em Ciencia da Informacao e Biblioteconomia.alguns problemas terminologicos, tais como: ambiguidade, polissemia, uso de termos provenientes de linguas estrangeiras e criacao de neologismos semlevar em conta a estrutura morfossintatica da lingua portuguesa. Ressalta a necessidade de estudos terminologicos para a implantacao e fortalecimento de uma terminologia brasileira em Ciencia da Informacao.Brazilian terminology in information science: ananalysisAbstractThe methods and principies of terminological workare applied in the survey and analysis of Brazilian terminology in Information Science. Identifies,from terms collected in the journal Ciencia da Informacao and the Catalogo de Teses e Dissertacoes em Ciencia da Informacao e Biblioteconomia, some terminological problems,such as ambiguity, polysemy, use of foreign words or expressions and neologisms, that do not take into account the Portuguese language structure or its syntactic and morphological aspects, The need of terminological studies for the establishment of a true Brazilian terminology in Information Scienceis emphasized

Effects of compound D600 (methoxyverapamil) on drug-induced contractions of isolated dog uterine muscle.

Abstract: 1. 1. The contractile responses of the isolated dog uterus to acetylcholine (Ach), oxytocin (Ot), histamine (Hist) and barium chloride (Ba 2+ ) were non-competitively blocked by compound D600. This compound was significantly more potent against Ba 2+ -induced contractions. 2. 2. Increasing the calcium (Ca 2+ ) concentration from 0.2 to 2.5 mM reverted the inhibitory effects of D600 against Ach, Ot, Hist and 1 mM Ba 2+ . The blockade produced by D600 against 30 mM Ba 2+ was not reversed by increasing the Ca 2+ concentration. 3. 3. In high K + - depolarizing solution, D600 produced a parallel and concentration-dependent displacement to the right to the concentration-response curves of both Ca 2+ and Ba 2+ . The Schild plot yielded similar p A 2 values for D600 against Ca 2+ and Ba 2+ .

Diffusion measurements in aligned nematic and smectic amphiphilic liquid crystalline decylammonium chloride and ammonium chloride water mixtures

Abstract: The micellar diffusion constants have been measured perpendicular to the optic axis in an aligned aqueous solution of decylammonium chloride and ammonium chloride, 10:1 by weight. The diffusion constants were calculated by measuring the evolution of the dye concentration along a microslide (.2 or .3 mm thick and 10 cm long) which had initially been half filled with solution containing a dye soluble only in the micelle. the other half being pure solution. Measurements were made in the isotropic phase for solutions containing 64 wt% water; in the nematic and smectic (neat soap) phases in solutions of 54 wt% water; and in the smectic phase of a 52 wt% water solution. The measured diffusion ranges from 4 × 10−7 cm2/sec to 7 × 10−7 cm2/sec. Taking into account the temperature dependence of the viscosity of water. we find Diw D<1Nm = D1 Sm.

A teoria do auto-cuidado e sua aplicabilidade no sistema de alojamento conjunto

Abstract: O trabalho se refere a aplicacao da teoria do OREM no sistema de alojamento conjunto, visando determinar as deficiencias das capacidades dos individuos para execucao de medidas de auto-cuidado.

Lack of the effect of ketamine on some dopaminergic behaviors in rats.

Abstract: The effects of ketamine on some experimental models for detecting dopaminergic activity were studied in rats. Small doses of ketamine (0.3 and 0.5 mg/kg, ip) induced yawning behavior while higher doses (15 and 30 mg/kg, ip) inhibited both apomorphine- and amphetamine-induced stereotyped behaviors. Ketamine (up to 60 mg/kg, ip) per se failed to elicit typical stereotype or catalepsy similar to that induced by dopamine agonists or antagonists, respectively. Ketamine may have acted as an agonist on dopaminergic autoreceptors. These results do not support the view that the behavioral effects of ketamine are mediated by purely dopaminergic mechanisms.