Showing papers by "Federal Fluminense University published in 1982"
TL;DR: In this paper, the phase diagrams that may occur in a mixed ApB1−p Ising ferromagnetic alloy are studied by the use of a new-type effective field theory.
43 citations
TL;DR: It appears that the iridoid-containing dicotyledons bifurcated at a primitive stage near the Ericales into the Cornales, with an extension to a Dipsacales branch and a Gentianiflorae branch, and into the Lamiiflora.
40 citations
TL;DR: It is suggested that Rhodnius prolixus developed salivary anti-haemostatic components that allows them to take a large meal in a short time.
36 citations
TL;DR: Susceptibility to trypsin and heat treatments as well as the behaviour of the principles on gel filtration and preparative agarose electrophoresis experiments, suggest that the activities reside in the same peptide molecule with an apparent molecular weight of 39,000 daltons.
36 citations
24 citations
TL;DR: Precocene and analogs added to the meal of 4th instar larvae of Rhodnius prolixus were tested as antifeedants and ATP, a phagostimulant, did not reverse the antifeingant action of precocene II.
Abstract: Precocene and analogs added to the meal of 4th instar larvae ofRhodnius prolixus were tested as antifeedants. While precocene II had a strong antifeedant effect (ED50=48 μg/ml), the other compounds showed no drastic inhibition of feeding (ED50>140 μg/ml). ATP, a phagostimulant, did not reverse the antifeedant action of precocene II. The mechanism of feeding inhibition is discussed.
21 citations
TL;DR: The representation of the visual field in the upper layers of the opossum's superior colliculus was studied by recording the response of multi-units to visual stimulation and revealed that the rostral region contains a representation of 40 ° of the ipsilateral field.
Abstract: The representation of the visual field in the upper layers of the opossum's superior colliculus was studied by recording the response of multi-units to visual stimulation. Overall, the visual topography is similar to that of other non-primate mammals. Along the horizontal meridian the magnification factor decreases assymetrically about the vertical meridian, falling more abruptly in the region of the representation of the ipsilateral hemifield. The colliculus may be divided into three parts on the basis of the projections from the retina: a rostral region that does not receive any ipsilateral retinal afferents, a region that receives binocular retinal projections and a monocular region that receives only contralateral retinal input. Electrophysiological recording revealed that the rostral region contains a representation of 40 ° of the ipsilateral field. The representation of the vertical meridian forms the border between the rostral region and the binocular region and the representation of the 40–45 ° longitude meridian forms the border between the binocular and monocular regions.
14 citations
TL;DR: The experiments show that the impedance changes during the retinal reaction might be related both to extracellular as well as cellular currents, and suggest changes of current flow through cellular components which are frequency-dependent.
9 citations
TL;DR: In this article, a simplified model of impurity induced temper embrittlement is developed assuming that the metal can be represented by a one dimensional chain of atoms where a tight-binding first nearest neighbour basis is used.
7 citations
TL;DR: Based on experimental results from CESR and from SLAC's crystal ball, charmonium (cc) and upsilon (bb) systems are analyzed, by using a phenomenological confinement approach.
Abstract: Based on experimental results from CESR and from SLAC’s crystal ball, charmonium (cc) and upsilon (bb) systems are analysed, by using a phenomenological confinement approach We show that the potentialKr1/2 — (4/3)αs/r +C describes adequately the spectroscopy of the two families mantaining the 4414 GeV state as charmonium’s 43S1 The dependence of the potential on flavour is also discussed
6 citations
Journal Article•
TL;DR: In this paper, a set of lesoes neuronais difusas, comprometendo principalmente o cortice, talamo e estruturas sub-talâmicas, desde lesoes discretas caracterizadas pela presenca de vacuolos intracitoplasmaticos (primeira alteracao vista na anoxia) ate neuronios totalmente degenerados.
Abstract: Foram feitos estudos neuropatologicos em dois casos de pacientes que apresentaram encefalopatia mioclonica pos-anoxica (sindrome de Lance-Adams). O encefalo mostrou lesoes neuronais difusas, comprometendo principalmente o cortice, talamo e estruturas sub-talâmicas, desde lesoes discretas caracterizadas pela presenca de vacuolos intracitoplasmaticos (primeira alteracao vista na anoxia) ate neuronios totalmente degenerados, notando-se varios neuronios com lesoes classicas de isquemia. A presenca de material de inclusao anfofilica discretamente PAS positiva observado no citoplasma neuronal foi diferente das inclusoes verificadas nos casos de epilepsia mioclonica com corpusculos de Lafora. Nao conseguimos identificar a constituicao destas inclusoes, apesar de serem feitos diferentes metodos de coloracao. Nao encontramos tambem, na literatura, referencia a tal tipo de inclusao. Foram tambem encontradas alteracoes vasculares, consistindo de vasos proliferados com celulas endoteliais tumefeitas. Tais celulas apresentaram-se com disposicao anarquica, provavelmente devidas a anoxia isquemica. A diferenca dos achados anatomopatologicos, entre os casos 1 e 2, sao provavelmente decorrentes do mecanismo diverso da instalacao da anoxia.
1 Dec 1982
TL;DR: In this article, a tranferencia da informacao cientifica em um grupo de pesquisa agricola, atraves do levantamento e analises da rede de comunicacao da Unidade de Execucao de Pesquisa de Ambito Estadual de Cascata- UEPAE of Cascada- Unidades da EMBRAPA em Pelotas, RS, a fim de elaborar um quadro comparativo entre o fluxo da rede
Abstract: Estudo da tranferencia da informacao cientifica em um grupo de pesquisa agricola, atraves do levantamento e analise da rede de comunicacao da Unidade de Execucao de Pesquisa de Ambito Estadual de Cascata- UEPAE de Cascata- Unidade da EMBRAPA em Pelotas, RS, a fim de elaborar um quadro comparativo entre o fluxo da rede de comunicacao atual com o fluxo da rede anterior, elaborada em 1978. Foram aplicados questionarios com o objetivo de identificar os polos de comunicacao, os nodos atuantes e nao-atuantes. Com base nesses questionarios, tornou-se possivel proceder as investigacoes dos criterios empregados na obtencao da informacao necessaria ao desempenho de suas atividades. O universo constou de 32 pesquisadores, sendo a populacao atingida de 96,8%, perfazendo um total de 31 pesquisadores que responderam ao questionario.
TL;DR: In this article, colorimetric, titrimetric and AAS determinations in the waters of the river Sarapui presented extreme deficiency of dissolved oxygen along the whole course, critical concentrations of Cl−, NH+ 4, and NO− 2, locally concentrated values of CN−, sharp variations in temperature (max. 129 C) and pH (max 4 units).
Abstract: Colorimetric, titrimetric and AAS determinations in the waters of the river Sarapui presented extreme deficiency of dissolved oxygen along the whole course, critical concentrations of Cl−, NH+ 4, and NO− 2, locally concentrated values of CN−, sharp variations in temperature (max. 129 C) and pH (max. 4 units). Na, Mg, K and Ca concentrations are higher than the normal fluvial means. Cr is 40 times higher than the MPV (Max. Permited Value). Cu, Zn and Hg are within permited levels. Mn is locally high.Co, Ni, Cd and Pb were not detected. The chemical species exhibit typical variations according to natural and anthropogenic influences, from the headwaters to the estuarine zone.