Showing 4 results for Esmaili-Sari
Jaber Aazami, Abbas Esmaili-Sari , Seyed Mahmoud Ghasempouri , Nader Bahramifar,
Volume 3, Issue 3 (Autumn 2010)
Abstract
Background: Present study was carried out in north of Iran to investigate the concentration of mercury (Hg) as one of the most toxic metals in tissues of two species of birds.
Methods: In this study, 15 birds from coot (Fulica atra) and 18 birds from cormorant (Phalacrocorax carbo) were hunted in Anzali and Gomishan wetlands. Data-analyses carried out using SPSS software version 17 licenced by Tarbiat Modares University. Data-test normality performed based on Sharpiro-Wilk’s test and P-value was set on P<0.05.
Results: Based on the study, for two species, mercury concentration in feather was in maximal and in muscles it was in minimal concentration. For coot muscles, kidney, liver tissues and feathers, it was 0.03, 0.07, 0.09, and 0.23 mg/kg, and for cormorant it was 2.26, 3.59, 5.67, and 8.68 mg/kg. In general, mercury (Hg) concentrations in coot were lower than cormorant (P<0.05). No significant differences were found between them in terms of sex (P< 0.05).
Conclusion: Concentration of mercury was not the same in two species. Statistical analysis didnot show a significant differences between male and female tissues of them.Our data can contribute to develop management programs for understanding the ecotoxicological status of the Caspian basin and its coastal environment.
Seyed Mahmoud Ghasempouri, Narjes Okati, Abbas Esmaili-Sari,
Volume 3, Issue 3 (Autumn 2010)
Abstract
Background: Mercury (Hg) is a hazardous metal responsible for environmental contamination and human intoxication. Methyl mercury bio-accumulation through food chain can be responsible for chronic mercury exposure of South Caspian Sea communities with a diet rich in fish. Uncertainties about exposure levels that could have damaging consequences for nervous system development of infants makes bio-monitoring of Hg a necessity in Southern Caspian Sea populations.
Methods: Mercury concentration in the hair of 70 pairs of mothers and their breastfed infants were assessed and its relationship with influencing factors was evaluated.
Results: Calculated levels of mercury exposure of both infants and mothers indicated concentrations less that the recommended levels by WHO and EPA reference. Total mean mercury concentrations in infants hair was 0.48±0.32 μg / g and for mothers was 0.19±0.09 μg / g. Correlation analysis showed that mercury concentration in the hair of infants was significantly (P=0.002, R=0.371) associated with mercury levels in the hair of their mothers. The influence of other variables such as living location, age of mothers, infants‘ sex, weight, the amount of fish and sea food consumption of mother, and the number of dental amalgam fillings, were examined as well as.
Conclusion: The amount of fish and sea food consumption by mothers and the living location were the variables that significantly affected hair mercury concentrations of mothers and infants. Also the age of infants (p=0.02) and the number of dental amalgam fillings of mothers (p=0.016) significantly affected the hair mercury levels in infants. Hair
Mahboubeh Nozari, Abbas Esmaili-Sari, Alireza Riyahi-Bakhtiyari, Jaber Aazami,
Volume 5, Issue 14 (Autumn 2011)
Abstract
Background: Mercury (Hg) is a major environmental contaminant due to its global ubiquity, tendency to bioaccumulate, and toxicity in wildlife. Mercury accumulation in wetlands threatens critical breeding and foraging habitats of many fish and wildlife species. In this study, mercury concentrations were detected in different tissues of pike.
Methods: To achieve these purposes, 58 pikes (Esox lucius) were hunted from Anzali wetland. Mercury concentration was analyzed by Advanced Mercury Analyzer (Leco, AMA 254). T-test was used to determine any significant differences between muscle and liver samples.
Results: The results revealed a significant difference (t = 0.85) in mercury concentrations between the tissues, whereas no significant differences were found in mercury concentrations between pikes of different sexes.
Conclusion: This study was conducted to evaluate the feasibility assessment to recognize bioindicatory index usage and to determine restricted standards to human consumption. Our data can contribute to the development of management programs for understanding the ecotoxicological status of Anzali wetland and can help determine restricted standards for human consumption.
Abbas Esmaili-Sari, Esmail Abdollahzadeh, Sharif Joorabian Shooshtari, Seyed Mahmoud Ghasempouri,
Volume 5, Issue 15 (Winter 2012)
Abstract
Background: Mercury is widespread and persistent in the environment. One organic form of mercury, Methylmercury (MeHg), can accumulate in the food chain in aquatic ecosystems and lead to high concentrations of MeHg in fish, which, when consumed by humans, can result in an increased risk of adverse effects. Currently, the Joint FAO/WHO Expert Committee on Food Additives (JECFA) has established provisional tolerable weekly intakes (PTWIs) for total mercury at 5 µg/kg body weight and for methylmercury at 1.6 µg/kg body weight. Mercury concentration in blood or hair has been widely used for estimation of methylmercury exposure.
Materials and Methods: In this review article, we calculated methylmercury exposure from hair mercury levels among six subpopulations (i.e. students, dentists, dental nurses, women with amalgam fillings, pregnant women in Mahshahr, and Women of a port town, Mahshahr, Iran). Some of the experiments had been performed by this group in previous years.
Results: The mean exposure level (µg/kg bw/day) in three Iranian groups (dentists, pregnant women, and women in Mahshahr) was higher than RfD and PTWIs.
Conclusion: As people are exposed to methylmercury mainly through their diet, especially from fish and other marine species, pregnant women should reduce fish consumption, especially predatory fish, and dentists should use preventive measures (like masks and gloves).
