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| Kruse,N.D.; Vidal,R.A.; Dalmaz,C.; Trezzi,M.M.; Siqueira,I.. |
| Determinações bioquímicas e físico-químicas são úteis para verificar o tipo de interação herbicida. Três experimentos foram conduzidos com dois herbicidas geradores de estresse oxidativo para demonstrar o possível sinergismo em sua associação. Plantas de girassol foram cultivadas em solução nutritiva até o estádio de dois pares de folhas, quando então os herbicidas foram aplicados. Os tratamentos consistiram de metribuzin a 0 e 0,28 µmol L-1 e clomazone a 0 e 80 µmol L-1, com quatro repetições, isolados e em mistura. No material coletado, três dias após a aplicação, determinou-se o malondialdeído (MDA), pelo método das substâncias reativas ao ácido tiobarbitúrico (TBARS). Em outro experimento, os herbicidas foram testados sobre 40 discos de 4 mm de folhas... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: TBARS; Condutividade eletrolítica; Sinergismo; Mistura de herbicidas. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582006000200023 |
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| Torres,I.L.S.; Gamaro,G.D.; Silveira-Cucco,S.N.; Michalowski,M.B.; Corrêa,J.B.; Perry,M.L.S; Dalmaz,C.. |
| It has been suggested that glucocorticoids released during stress might impair neuronal function by decreasing glucose uptake by hippocampal neurons. Previous work has demonstrated that glucose uptake is reduced in hippocampal and cerebral cortex slices 24 h after exposure to acute stress, while no effect was observed after repeated stress. Here, we report the effect of acute and repeated restraint stress on glucose oxidation to CO2 in hippocampal and cerebral cortex slices and on plasma glucose and corticosterone levels. Male adult Wistar rats were exposed to restraint 1 h/day for 50 days in the chronic model. In the acute model there was a single exposure. Immediately or 24 h after stress, the animals were sacrificed and the hippocampus and cerebral... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Restraint stress; Chronic stress; CO2 production; Glucose oxidation; Hippocampus; Cerebral cortex. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2001000100013 |
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| Gamaro,G.D.; Michalowski,M.B.; Catelli,D.H.; Xavier,M.H.; Dalmaz,C.. |
| The present study investigated the effect of repeated stress applied to female rats on memory evaluated by three behavioral tasks: two-way shuttle avoidance, inhibitory avoidance and habituation to an open field. Repeated stress had different effects on rat behavior when different tasks were considered. In the two-way active avoidance test the stressed animals presented memory of the task, but their memory scores were impaired when compared to all other groups. In the habituation to the open field, only the control group showed a significant difference in the number of rearings between training and testing sessions, which is interpreted as an adequate memory of the task. In the handled and chronically stressed animals, on the other hand, no memory was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chronic stress; Memory; Inhibitory avoidance; Two-way active avoidance; Open field. |
| Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1999000300015 |
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| Torres,R.L.; Torres,I.L.S.; Gamaro,G.D.; Fontella,F.U.; Silveira,P.P.; Moreira,J.S.R.; Lacerda,M.; Amoretti,J.R.; Rech,D.; Dalmaz,C.; Belló,A.A.. |
| Exposure to stress induces a cluster of physiological and behavioral changes in an effort to maintain the homeostasis of the organism. Long-term exposure to stress, however, has detrimental effects on several cell functions such as the impairment of antioxidant defenses leading to oxidative damage. Oxidative stress is a central feature of many diseases. The lungs are particularly susceptible to lesions by free radicals and pulmonary antioxidant defenses are extensively distributed and include both enzymatic and non-enzymatic systems. The aim of the present study was to determine lipid peroxidation and total radical-trapping potential (TRAP) changes in lungs of rats submitted to different models of chronic stress. Adult male Wistar rats weighing 180-230 g... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Stress; TBARS; TRAP; Free radicals; Lungs; Oxidative stress. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2004000200004 |
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| Torres,I.L.S.; Vasconcellos,A.P.; Silveira Cucco,S.N.; Dalmaz,C.. |
| There is extensive evidence that acute stress induces an analgesic response in rats. On the other hand, repeatedly stressed animals may present the opposite effect, i.e., hyperalgesia. Furthermore, exposure to novelty is known to induce antinociception. The effects of repeated restraint stress on nociception after exposure to novelty, as measured by the tail-flick latency (TFL), were studied in adult male rats. The animals were stressed by restraint 1 h daily, 5 days a week for 40 days. The control group was not submitted to restraint. Nociception was assessed with a tail-flick apparatus. After being familiarized with the TFL apparatus, each group was subdivided into two other groups, i.e., with or without novelty. Animals were subjected to the TFL... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Pain; Stress; Repeated stress; Nociception; Novelty. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2001000200012 |
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| Silveira,P.P.; Benetti,C. da Silva; Portella,A.K.; Diehl,L.A.; Molle,R. Dalle; Lucion,A.B.; Dalmaz,C.. |
| Neonatal handling induces several behavioral and neurochemical alterations in pups, including decreased responses to stress and reduced fear in new environments. However, there are few reports in the literature concerning the behavioral effects of this neonatal intervention on the dams during the postpartum period. Therefore, the aim of the current study was to determine if brief postpartum separation from pups has a persistent impact on the dam's stress response and behavior. Litters were divided into two neonatal groups: 1) non-handled and 2) handled [10 min/day, from postnatal day (PND) 1 to 10]. Weaning occurred at PND 21 when behavioral tasks started to be applied to the dams, including sweet food ingestion (PND 21), forced swimming test (PND 28), and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Feeding behavior; Neonatal handling; Psychostimulants; Stress response; Dam behavior. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2013000500426 |
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