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Showing 2 results for Memory Consolidation

Shirin Babri , Naser Khalajy ,
Volume 6, Issue 4 (12-2006)
Abstract

  Background & Objectives : Piracetam is a nootropic compound, which acts as a nervous system enhancer. Different processes are involved in memory formation and various parameters are able to disturb it. Due to increase of exposure possibility to electromagnetic fields in recent years and the effects of theses fields on memory consolidation, this investigation designed to clear the relation between these parameters and memory consolidation.

  Methods: In this research eleven groups of male wistar rats (ten rats in each group) with a mean weight of 275±25 gr aging 3-4 months were studied. To evaluate the effects of electromagnetic field, four groups of rats were exposed to 5mT/50HZ electromagnetic field for 1,4,6 and 8 hours respectively immediately after training. In other six groups 250mg/kg or 500 mg/kg piracetam were administered orally one hour before training. They were also exposed to electromagnetic field for 4,6,8 hours respectively immediately after training,. Retrieval test was performed 24 hours later in all groups.

  Results: 1 hour exposure on EMF had no meaningful effect on memory consolidation, however, in other three groups the electromagnetic fields impaired memory consolidation significantly compared to the control group (p<0.05). Piracetam administration with two mentioned doses significantly improved memory consolidation (p<0.05).

  Conclusions: Acute exposure to low intensity magnetic field can disturb memory consolidation and piracetam administration can prevent it.


Tahereh Haghpanah, Vahid Sheibani, Mohammad Reza Afarinesh, Mousa Al Reza Hajzadeh, Khadijeh Esmail Pour Bezenjani, Yasamin Pahlavan,
Volume 12, Issue 4 (12-2012)
Abstract

  Background & Objectives: I ntra-hippocampal adminestration of origanum (ORG) improves spatial learning of rats. T he aim of the present study was to investigate the possible mechanism for origanum extract on spatial learning and memory in the hippocampus.

  Methods : In this study 42 adult male Wistar rats were used . Animals were cannulated bilaterally in the posterior laterl of hippocampus. After the recovery period, the spatial learning and memory were assessed using Morris Water Maze (MWM). Saline, ORG (0.03μg/site) glutamate receptor antagonist MK801 (0.08, 0.2 and 0.4 μmol/site) and co-injected of MK + ORG was injected into the posterior lateral of hippocampus 20 minutes before the training and retrival sesions (for 5 consecutive days) (n=7).

  Results: The results showed that the intra-hippocampal injection of MK 801 significantly blocked the decreased distance and time of reaching (due to ORG injection) to find hidden platform of MWM (p<0.05). On the retrival tests, the average of time spent in the target area is reduced in the co-injected of MK801 + ORG group.

  Conclusion: The intra-hippocampal injection of aqueous extract oforiganum may improve working memory in rats through glutamate-dependent NMDA receptors.



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مجله دانشگاه علوم پزشکی اردبیل Journal of Ardabil University of Medical Sciences
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