جستجوی مقالات مرتبط با کلیدواژه "نیتریت و نیترات" در نشریات گروه "پزشکی"

Excessive intake of nitrite and nitrate threatens human health. The aim of this study was to determine the levels of nitrite and nitrate in some summer vegetables cultivated in Bastam region of Shahroud.

the study was conducted in the summer. The study area was divided and a total of 25 summer vegetables, 15 soil samples, and three water samples were measured to determine the levels of nitrate and nitrite according to the Standard instruction (No. 4106).

The total average of nitrate in cucumber, tomato, potato, eggplant and onion was 850.1 ± 65.2, 642.1± 25.4, 48.6 ± 2.5, 14.8 ± 4.5, 791.3±52.1 mg/kg fresh weight, respectively and this level for nitrite was equal to 9.23 ± 0.1, 7.2 ± 0.8, 0.52 ± 0.04, 0.9± 0.05, 5.3±0.32 mg/kg fresh weight that all values were less than the standard level.The level of nitrate and nitrite in the soil was 1250.68 ±562.2 and 98.1 ± 15.2 mg/kg soil weight, respectively. The level of nitrate and nitrite in the water was 5.68±2.2 and 0.23±0.2 mg/l, respectively.

Due to the high consumption of vegetables and summer vegetables in summer and spring, which are also the fertilizing seasons for plantsand shrubs,it is recommended that managers and farmers pay more attention to the process of cultivation and fertilization of agricultural products, as well as frequent monitoring of the level of nitrite and nitrate in the country's vegetables.

Atherosclerosis in patients with type 2 diabetes is characterized by endothelial dysfunction that is associated with increases of assymetric dimethyargenin and nitric oxide reduction. The purpose of the present study was to compare the effects of 12 weeks of high-intensity interval (HIIT) and moderate-intensity continuous training (MICT) on plasma levels of vaspin, assymetric dimethyargenin (ADMA), and nitrite/nitrate (NOx) on type 2 diabetes.

The statistical population of the present study included patients with type 2 diabetes, aged 45-60 years old, from Tehran. The sample included 48 type 2 diabetic patients who were randomly assigned into three groups: HIIT (n= 16), MICT (n= 16), and control (n=16). The HIIT group intervention was 12 intervals at 85-90% maximal heart rate (HRmax) and 2 min at 55-60% Hrmax and the MICT group intervention was performed based on ergometer cycle for 42 min of exercise at 70% HRmax for 3 sessions per week during 12 weeks. The blood sample was collected 48-h before and 48-h after the last sessions of exercise training. The vaspin and ADMA were measured using ELISA, and NOx was measured using Griess assay. Data were analyzed using mixed-liner ANOVA in SPPS, version 18.

The results showed that VO2peak and plasama levels of vaspin (P= 0.028) and NOx (P= 0.016) increased significantly in HIIT as compared with those in the MICT group. Insulin resistance (P= 0.041), plasma levels of insulin (P= 0.039), glucose (P= 0.026), and ADMA (P= 0.018) decreased significantly in HIIT as compared with those of the MICT group (p < 0.05).

According to the results, HIIT via increase of vaspin led to a decrease in ADMA which eventually increased plasma levels of NOx in patients with type 2 diabetes.

The nitrite and nitrate are considered as pollutant agents of ground water resource، which are currently entering the wastewater types their average، are increasing. In this study، changes in nitrate and nitrite in drinking water resources of Gachsaran are reviewed with GIS systems.

In this cross-sectional study، the sampling and measurement of parameters was done based on the Standard method book، Overall the number 258 samples from 43 sources and results of 5 years Archived analysis in Water and sewage Co with GIS software version 9. 3 and SPSS version 16 and Pearson correlation test was analyzed.

The results showed that، the concentration of nitrate from 5. 15 (based on nitrate) in year of 2006 and nitrite from 0. 01 in 2009 increased to 10. 87 and 0. 0157 (ppm)، respectively in 2011. The minimum of nitrate concentration related to year of 2006 and their maximum was 11ppm (based on nitrate) in 2009 and local changes of nitrite and nitrate levels indicated that the studied area have high quality Compared to other areas. Discussion and

According to the results، the concentration of nitrite and nitrate is increased during the past years. While the concentration of these parameters was less than determined National and international standards، but due to the risks of this elements must be prevented the increasing trend.

Nitrate and nitrite in drinking water is harmful for human health, specialy when its amount is more than the standard level.The purpose of this study include measuring concentration of nitrate and nitrite in drinking water of Hamadan city in each season, during one year. In order to compare the seasonal nitrate and nitrite,totally 232 sample were taken from water. The WHO standard methods was used to analysis the nitrate and nitrite concentration in the water . The results showed that concentration of nitrate and nitrite were 17.72 and 0.03 mg/lit respectively, that were not more than standard limit. But the concentration of nitrate in summer was more than others seasons, and the difference was statistically significant (P < 0.05 ) . Finally, at the present time, it can be concluded that, concern with concentration of nitrate and nitrites in drinking water of Hamadan, is healthy.