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Introduction: Production of free radicals and reactive oxygen species is an integral part of aerobic metabolism. Disturbance of the balance between the production of free radicals and antioxidant system against them produces oxidative stress. Paraquat toxicity is induction of oxidative stress. However, the aim of our study was to evaluate oxidative stress in blood samples of workers in a pesticide factory formulating paraquat.
Materials and Methods: In this study we measured lipid peroxidation (LPO) with thiobarbituric assay (TBARS), total antioxident power (FRAP) and SH groups between workers in pesticide factories (case group) and health subjects (control group).
Results: Oxidative stress was significantly higher (p<0.001) in LPO, significantly lower (p<0.001) in TBARS and significantly lower (p<0.001) in SH groups in the case group compared to control group
Conclusion: It is concluded that chronic exposure of workers in their workplace to paraquat producess oxidative stress that could be prevented by well known nutritional antioxidant supplements.

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Introduction: Sequential word learning is a crucial aspect of memory research in cognitive neuroscience, emphasizing the importance of recalling words at the beginning (primacy) and end (recency) of a sequence. This study aims to investigate the extent of primacy and recency effects in patients with neglect syndrome caused by right parietal lobe damage.
Methods: This case-control study involved 18 patients with parietal lobe tumors, divided into two groups: 9 patients with neglect syndrome and nine without. Patients referred to the neurosurgery department of Shahid Tajrish Hospital with right parietal lobe lesions underwent neurological and psychological evaluations, including the cancellation test, line bisection test, copying test, and the 5-point test. Those diagnosed with neglect syndrome formed the syndrome group, while the rest constituted the control group. Both groups participated in immediate recall (short-term memory) and delayed recall (long-term memory) tests for sequential word learning, with results analyzed for primacy and recency effects.
Results: Among the 18 patients, 61% were men and 39% were women. Analysis of immediate and short-term memory tests for sequential word learning revealed no significant differences in primacy and recency effects between the two groups.
Conclusions: The findings suggest that patients with right parietal lobe damage and neglect syndrome do not exhibit significant differences in primacy or recency effects in verbal memory during sequential word learning compared to the control group. Consequently, immediate and short-term memory appears relatively unaffected in these patients.