Showing papers by "Universidade Federal de Santa Maria published in 1996"
TL;DR: In this paper, the authors investigated behavior in the open field and shuttle avoidance, for as well as tissue lead burdens of pre- and postnatally lead-exposed rats and found that lead exposure associated with behavioural alterations.
Abstract: In view of conflicting results in literature concerning lead exposure associated with behavioural alterations, this study investigated behaviour in the open-field and shuttle avoidance, for as well as tissue lead burdens of pre- and postnatally lead-exposed rats. Rats were exposed to the metal from conception to weaning by giving the dams 0.5, 2.0 or 4.0 mM lead acetate in drinking water. This regimen did not affect body weight gain of dams or offspring development and had no effect on cerebral weights nor on haematological parameters of 23-day-old rats. In 1-day-old rats, lead accumulated in the blood but not in the brain, whereas both in 23-day-old rats and in dams lead accumulated in blood, kidney and cerebral cortex. In the open-field, lead-exposed groups showed higher locomotor activity in the test session as compared to controls and did not show any decrease in rearing responses in the test, indicating less habituation. Lead-treated rats subjected to a shuttle avoidance task showed no significant increase in avoidance responses between sessions as compared to control, indicating less retention. Moreover, only the control group presented a significant reduction of the footshock escape latency along testing session, suggesting a lead effect on footshock escape acquisition. In the shuttle box, intertrial crossing responses were not affected by lead treatment. The behavioural alterations occurred in animals with blood lead levels in the range 11-50.6 micrograms/dl.
138 citations
TL;DR: Numerical tests in a series of randomly generated problems indicate that the proposed method outperforms a previous heuristic in solving the problem of scheduling n jobs on m identical parallel processors with the objective of minimizing the total execution time.
111 citations
TL;DR: In this paper, the 1-iodo-1-selenoalkenes were transformed into corresponding vinylic organometallics (M=Zn, Cu, Cr).
77 citations
TL;DR: A relatively strong stratospheric column ozone decrease was observed in the south of Brazil (29.5 S) in 1993, at the end of October as mentioned in this paper, when the normal behavior of the ozone column at low latitudes, in Brazil, reaches its yearly maximum, so that a decrease of ozone during this time period is unexpected.
74 citations
TL;DR: The results obtained showed that although Araucaria angustifolia was the dominant species of the canopy layer, it did not appear in the natural regeneration layer and Mimosa scabrella was the most important tree species found in the seed bank in the soil.
Abstract: The study was made in the Genetic Reserve Forest of Cacador, in the State of Santa Catarina, Brazil. In the study of natural regeneration were established 10 plots with an area of 250 sq m (25m x 10m). Inside the plots, were collected a layer of soil with foliage up to 3 cm of depth in the 40 samples with an area of 0,5m x 0,5m to the analyse of the seed bank in the soil. Moreover, 20 traps with an area of 0,5m x 0,5m were established to evaluate seed rain. The results obtained showed that although Araucaria angustifolia was the dominant species of the canopy layer, it did not appear in the natural regeneration layer. On the other hand, Mimosa scabrella was the most important tree species found in the seed bank in the soil. The relation between the three parameters evaluated suggested an irregular distribution of the species in the study site.
73 citations
01 Oct 1996
TL;DR: In this article, the authors presented the use of time series ARIMA model with interventions, and neural network backpropagation model in analyzing the behavior of sales in a medium size enterprise located in Santa Maria (RS), Brazil for the period January 1979 - December 1989.
Abstract: This paper presents the use of time series ARIMA model with interventions, and neural network backpropagation model in analyzing the behavior of sales in a medium size enterprise located in Santa Maria (RS), Brazil for the period January 1979 - December 1989. The forecasts obtained using the backpropagation model were found to be more accurate than those of ARIMA model with interventions.
69 citations
TL;DR: Evidence is provided for a participation of NMDA receptors in the MMA-induced behavioral alterations, where succinate dehydrogenase inhibition seems to have a pivotal role.
68 citations
TL;DR: In this article, a fully discrete implicit finite-element approximation of a model for the phase separation of a multi-component alloy was proposed and proved existence, uniqueness and stability of the numerical solution for a sufficiently small time step.
Abstract: We consider a fully discrete implicit finite-element approximation of a model for the phase separation of a multi-component alloy. We prove existence, uniqueness and stability of the numerical solution for a sufficiently small time step. We prove convergence to the solution of the associated continuous problem. We perform a linear stability analysis of the equation and describe some numerical experiments.
62 citations
01 Oct 1996
TL;DR: Quality Function Deployment is used in a health care system to deploy the voices of the customers in understanding their requirements and to include them for continuous improvement of quality in services provided.
Abstract: Quality Function Deployment (QFD) is used in a health care system to deploy the voices of the customers in understanding their requirements and to include them for continuous improvement of quality in services provided.
54 citations
23 Jun 1996
TL;DR: In this paper, a control strategy for three-level boost power factor correction converter with fully regulated two outputs is proposed, and a switching logic law is established to minimize the input current ripple.
Abstract: In this paper, a control strategy for three-level boost power factor correction converter with fully regulated two outputs is proposed. Beyond two outputs which are completely regulated, a switching logic law is established to minimize the input current ripple. Besides the features of the three-level boost power converter already known, the proposed approach has the advantage of regulating two output voltages for unbalanced loads, guaranteeing voltage sharing across the semiconductor device independent of the load, based on a Lyapunov-like technique. The robustness of the feedback control system is investigated, and experimental results are reported.
52 citations
TL;DR: In this paper, the 3-aryl-5-hydroxy 5-trihalomethylisoxazoles 5,6a-g was obtained by cyclocondesation with hydroxylamine hydrochloride in the presence of an excess of concentrated hydrochloric acid.
TL;DR: The detection and identification of the reaction step during which migration of the secondary 2-O-tert-butyldimethylsilyl groups occurs is described and possible mechanisms of migration are discussed.
01 Oct 1996
TL;DR: In this paper, a small-sized custom-made furniture industry for continuous improvement and to develop the products with higher quality, lower cost, and higher productivity in meeting the customer requirements.
Abstract: Kaizen philosophy is applied in a small-sized custom-made furniture industry for continuous improvement and to develop the products with higher quality, lower cost, and higher productivity in meeting the customer requirements.
TL;DR: Investigation of the potential role of Ca(2+)-ATPase located in the endoplasmic reticulum as a molecular target for mercury found part of the cysteinyl residues involved in the inhibitory actions of mercury in Ca( 2+)-transport bind to mercury with an extremely high affinity.
TL;DR: In this article, a voltage source inverter, connected in series with the AC supply through a transformer, is used to compensate the input voltage variations to achieve a regulated load voltage.
Abstract: Regulation of load voltage in single-phase applications is becoming an important issue for critical loads. This paper proposes a method to regulate a single-phase AC source by using a series connected auxiliary voltage source. A voltage source inverter, connected in series with the AC supply through a transformer, is used to compensate the input voltage variations to achieve a regulated load voltage. Input power factor improvement can also be obtained, when operating with reactive load, by phase-shifting the compensating voltage with respect to the input voltage. The operation of the compensator in all four quadrants allows the compensation of any voltage drop, and not only the reactive voltage drop within the same path. The total kVA rating for the system is a fraction of the load total power, and is determined by the maximum allowable line voltage variations. The use of a series connection associated with a high-performance modulation technique results in a high-quality output with a small size filter. This paper includes a description of the proposed method, implementation principles, design equations and a design example. Steady-state performance features are investigated. Simulated and experimental results confirm the concept and feasibility of the proposed system.
TL;DR: In this article, a method to obtain a new series of 2-trichloromethyl-4-aryl-3H-1,5-benzodiazepines from the reaction of β-methoxyvinyl trichlormethyl ketones derived from acetals and o-phenylenediamine is reported.
TL;DR: Samples of the toxic Brazilian plant, Baccharis coridifolia, were collected during the growing season, and the toxicities in calves of the plant materials were correlated with the levels of macrocyclic trichothecenes present.
Abstract: Samples of the toxic Brazilian plant, Baccharis coridifolia, which is responsible for numerous cases of livestock poisoning in southern Brazil and Argentina, were collected during the growing season, and the toxicities in calves of the plant materials were correlated with the levels of macrocyclic trichothecenes present. Female plants in flower were considerably more toxic than male plants or plants not in flower. Plants not in flower were of intermediate toxicity. The female plants in flower typically contained 5-10 times the levels of toxins as were found in the male plants. In addition, six new glucosides of the macrocyclic trichothecenes were isolated and characterized. The most prominent glucosides, those of roridins A and E, were found in high levels in the female plants.
TL;DR: In this paper, the effect of the cyclopentane ring on the regiochemistry of 2-acetylcyclopentanones 1a-d and β-methoxyvinyl trifluoromethyl ketone derivative 2a with hydroxylamine hydrochloride was investigated.
TL;DR: In this article, the zinc supply to the plant and the effects of seed treatment with zinc on germination, vigour, growing and grain yield are presented. But the zinc reserve is important for initial growing avoiding seedling zinc deficiency in some brazilian soils.
Abstract: Zinc is frequentty deficient in some brazilian soils. Seed treatment with zinc is a feasible way to suppiy zinc to plants. Seedzinc reserve is important for initial growing avoiding seedling zinc deficiency. This paper presents the zinc supply to the plant and the effects of seed treatment with zinc on germination, vigour, growing and grain yield.
TL;DR: The agar gel immunodiffusion test was used for sorological evaluation and showed that 72.7% (8/11) of the dogs were infected wifh the bacteria.
Abstract: The ocurrence of canine brucellosis is described in a kennel from Uruguaiana city. Due to abortion registered at the kennel the suspected disease was brucellosis. The isolation of Bucella canis was realized by culturing the material collected from aborted fetuses, placenta and neonatos. The agar gel immunodiffusion test was used for sorological evaluation and showed that 72.7% (8/11) of the dogs were infected wifh the bacteria. The authors describe also the clinical signs, serological findings and also the isolation of the Brucella canis.
TL;DR: The main aspects relating to the diagnosis of vesicular stomatitis, bovine virus diarrhea, malignant catarrhal fever, bovo herpesvirus 1 and 5, and ulcerative stom atitis associated with bovines parvovirus are described.
Abstract: Diseases to be considered in the differential diagnosis of foot-and-mouth disease are reviewed. The main aspects relating to the diagnosis of vesicular stomatitis, bovine virus diarrhea, malignant catarrhal fever, bovine herpesvirus 1 and 5, andem ulcerative stomatitis associated with bovine parvovirus are described. Bluetongue, that probably occurs in Rio Grande do Sul because antibodies to the virus have been detected in cattle and sheep; is refered. Bovine ulcerative mammilitis, reported in other Brazilian States, rinderpest, reported and eradicated in the State of Sao Paulo in 1921, and popular stomatitis are also cited, and so are two exotic diseases: vesicular exanthema and swine vesicular disease.
Journal Article•
09 Dec 1996
TL;DR: A survey done in the districts of Santa Maria, RS, revealed that people make continuous use of medicinal plants, with a total of 148 species belonging to 134 genus and arranged in 64 families.
Abstract: A survey done in the districts of Santa Maria, RS, revealed that people make continuous use of medicinal plants. This study was based on interviews made with the residents of seven districts of the city: Nossa Senhora de Lourdes, Medianeira, Nossa Senhora das Dores, Centro, Nossa Senhora do Rosario, ltarare and Patronato. A total of 148 species were registered, belonging to 134 genus and arranged in 64 families. Lists are shown containing the species mentioned in the questionaries, along with the popular name, family, therapeutic indication and pharrnacogeno.
TL;DR: In this paper, the Eucalyptus grandis taper was adjusted by a 5 degree polynomial, having as dependent variable the relative diameter (d i /d) and as independent variable h i /h), which showed good adjustment and good statistical precision.
Abstract: In this paper it was studied the Eucalyptus grandis taper in order to determinate the volume and formation of wood assortment in two classes: sawmill, consisting of logs with 30 cm minimun diameter overbark and lenght of 4,20m, 3,40m and 2,60m, with priority of getting higher sizes groups; industrial logs or segments of it, with diameter between 7cm and 30cm overbark. The taper was adjusted by a 5 degree polynomial, having as dependent variable the relative diameter (d i /d) and as independent variable the relative height (h i /h), which showed good adjustment and good statistical precision. This result shows the possibility of estimating either the absolute and relative volume of the assorment by integration of the taper function.
TL;DR: It is demonstrated that intrahippocampal co-administration of GMP reverses the facilitatory effect of glutamate on the inhibitory avoidance learning paradigm and inhibits [3H]glutamate binding in hippocampal synaptic plasma membranes, suggesting that guanine nucleotides may modulate glutamate actions.
Abstract: Previous studies have demonstrated that post-training intrahippocampal glutamate administration improves inhibitory avoidance task performance in rats. Antagonism of the agonist actions of glutamate by guanine nucleotides has been shown at the molecular and behavioural level. In the present investigation we demonstrate that intrahippocampal co-administration of GMP (guanosine 5'-monophosphate) reverses the facilitatory effect of glutamate on the inhibitory avoidance learning paradigm and inhibits [3H]glutamate binding in hippocampal synaptic plasma membranes. These results suggest that guanine nucleotides may modulate glutamate actions.
TL;DR: In this paper, a quantitative approach of predicting the growth and yield of natural forests is described and applied, aimed at helping the forest manager in decision making concerning the choice of an appropriate cutting cycle.
Abstract: A quantitative approach of predicting the growth and yield of natural forests is described and applied. The method proposed aimed at helping the forest manager in decision making concerning the choice of an appropriate cutting cycle. The approach is based upon the transition matrix model. The data used in the simulation model constructed in this study came from a natural forest in Japan remeasured during 10 years. The parameters necessary for implementation of the method are: the transition matrix of diameter classes, mortality and recruitment estimates for the forest under natural condition and open canopy, and the acceleration of growth rate due to human interference in the stand. The application of the model is demonstrate showing its potential utilization in simulating the effect of different cutting intensities. It was concluded that the model proposed might be a valuable tool for the manager to predict the growth and cutting cycle of logged uneven-aged forests.
TL;DR: Meat of higher slaughter weight steers was juicier and had better flavor, and no statistical difference was observed among treatments for meat tenderness (panel or WB-Shear).
Abstract: Meat quality of eighteen Charolais steers, 30 months old, feedlot finished with different slaughter weights: T1 = 421 kg; T2 = 461 kg; and T3 = 495kg was evaluated. Meat marbling, color and texture did not differ among treatments. T1 meat showed higher thawing losses (8.1%) than T2 and T3 meat (4.8 and 5.1%, respectively), while cooking losses were higher in T2 meat than for T3. No statistical difference was observed among treatments for meat tenderness (panel or WB-Shear). Meat of higher slaughter weight steers was juicier and had better flavor.
TL;DR: In this article, the reactivity of enamino compounds 4-amino-3-phenylamino(thio)carbonyl-3 -penten-2-one 1 and 2 and ethyl 3-aminosin-2 -phenymyl-phenyrel-2butyrate 7 and 8 was studied using the reaction with hydrazine hydrate and hydrazin hydrochloride to evaluate the 1,3 electrophilic center of the compounds by the formation of the pyrazole rings.
TL;DR: The objective of this study was to structurate the yield of Pinus taeda L. forest, located at the country municipality of Cambara do Sul, RS, according to age, potential of sites and applied management.
Abstract: The objective of this study was to structurate the yield of Pinus taeda L. forest, located at the country municipality of Cambara do Sul, RS, according to age, potential of sites and applied management. Data was collected from temporary and permanent parcels and from the trunk analysis. Mathematic equations were used to estimate the development of the remaining populations after thinning and the K-Magin factor was used to rectify the thinning volume,varying from 0.76 to 0.78. The results grouped in yield tables for the sites 16 to 28 showed a volume of 243.7 m 3 /ha and 911.0 m 3 /ha, respectivelly, for the age of 16 years old. The average annual growth at this age, considering the cut age employed by the company reached 15.23 m 3 /ha/year for the site index 16 and 56,97 m 3 /ha for the site index 28. The results also showed the yield loss due to early thinnings in poor sites and late thinnings in good sites.