Ali Khavanin, Ramezan Mirzaee, Maryam Safari, Ardalan Soleimanian,
Volume 5, Issue 2 (13 2012)
Abstract
Background and Objectives: city bus drivers, during driving, are always exposed to the whole body
vibration. This can lead to central- neural, musculoskeletal, and blood
circulation disorders and develop occupational diseases due to vibration. The
objective of this descriptive- analytic study is to investigate Tehran bus drivers&apos
exposure to the whole body vibration.
Materials and Methods: We measured parameters related to the whole body vibration, such as
acceleration of the frequency weighted root sum of squares, the overall
equivalent acceleration, vibration dose value, and crest factor were measured
separately at three directions (X, Y, Z) in 80 buses in 5 different types,
which were selected randomly. The results obtained were compared with ISO 2631:
1997 Standard, and finally permitted driving time was calculated for different
buses.
Results: Acceleration
of the frequency weighted root mean of squares at X, Y axes in all of the buses
was below the district of health warning and at Z axis, it was in the district
of health warning, while the overall equivalent acceleration in Icarus buses
was above the district of health warning and in other buses it was in the
district of health warning according to standard ISO 2631: 1997. Vibration dose
value (VDV) was less than 8.5 and crest factor was less than 9 and in all of
the buses, it was less than the suggested permitted limits of ISO 2631: 1997 standard.
Moreover, permitted driving time was estimated less than 8 hours per day and
Icarus buses had the most and Man buses had the least vibration acceleration,
crest factor, and vibration dose value respectively.
Conclusion: According
to the results obtained, there is the possibility of developing potential
health risks in bus drivers therefore, it is recommended that the health and
safe managers consider decrease of working hours and increase of rest time
while purchasing new buses.
Mahdis Mosayebi, Habiballah Mirzaee,
Volume 6, Issue 4 (3-2014)
Abstract
Background and Objective: Rice is one of the most consumed food items that is exposed to mycotoxins and heavy metals contamination. Due to the accumulation of heavy metals in the tissues of human body and its side effects on the body and being carcinogenic and mutagenic mycotoxin, the present study was conducted to determine contamination of rice imported in Golestan Province. Materials and Methods: We collected 80 samples of imported rice from India and Pakistan on the Inche boron border in Golestan province between January 2011 and August 2012. We analyzed each sample for the amount of mycotoxins (aflatoxins B1, B2, G1, G2 and total aflatoxins, ochratoxin A, zearalenone and dexynivalenol) and heavy metals (lead, arsenic, and cadmium). We used HPLC to measure mycotoxins and immunoaffinity column (Dexynivalenol purification was conducted using DONSPE column) for purifying. Hydride generation atomic absorption based optical spectroscopy technique was used for determining arsenic. Graphite furnace atomic absorption according AOAC.986.15 was used to determine lead and cadmium. Results: We found that the average level of aflatoxin B1, B2, ochratoxin A, and total aflatoxin were 0.93, 0.036, 0.033 and 0.96 ng/g respectively. Aflatoxin G1, G2 and dexynivalenol was not observed in any of the samples. Average concentrations of lead, arsenic, and cadmium in the samples were 0.067, 0.007, 0.024 mg/kg respectively. Conclusions: All samples were within the accepted maximum limits of Iran National Standards for heavy metals and mycotoxins in rice.
S. A. Mirzaee, M.m Amin, M Sarafraz, M Heidari, M.m Ahmad Moazzam,
Volume 7, Issue 4 (1-2015)
Abstract
Background & Objectives: Disposal of pharmaceutical compounds to environment as an emerging pollutants cause concerns significantly and it is necessary to use new methods of sewage treatment for removal of these compounds. The aim of this study was to investigate the inhibition effects of metronidazole before and after using UV254/H2O2 process on specific methanogenic activity of.anaerobic biomass. Materials & Methods: Fourteen anaerobic digestion tests were carried out at batch scale before and after using UV254/H2O2 process in 500 ml reactors with 30% anaerobic biomass and 70% substrate. The liquid displacement method was used. Duration of each test was in the range of 10-17 days. Results: Cumulative Biomethane production in concentrations of 1, 5, 10, 25, 50, and 100 mg/l metronidazole was 34.04, 95.12, 100.86, 3.28, 27.88, and 6.97 ml respectively. This production was 800.73, 243.54, and 10.66 ml in concentrations of 25, 50, and 80 mg/l respectively using UV254/H2O2 process as pretreatment at 60 min retention time. Biomethane production in concentrations of 80,120, and 150 mg/l was 377.2, 380.48, and 63.14 ml respectively at 90 min retention time. Conclusion: Different concentrations of metronidazole had an inhibition effect on anaerobic digestions and therefore the efficient pretreatment method is needed to reduce this inhibition effect. The UV254/H2O2 process is an effective method for degradation and conversion of metronidazole to more biodegradable compounds for anaerobic bacteria consumption and, in turn, to increase biogasproduction in anaerobic digestions.
N Shiralipour, Mr Mirzaee Nejad,
Volume 11, Issue 4 (3-2019)
Abstract
Background and Objective: Health expenditures and environmental pollution are indicators of development. Therefore, the aim of this study was to examine the effect of health per capita costs and the impact of carbon dioxide emissions (CO2) as an indicator of environmental pollution on the growth of selected developed and developing countries.
Materials and Methods: The effect of health expenditures and air pollution on economic growth was studied based on the data of two groups of developed and developing countries (2000-2015) and the use of econometric methods.
Results: The fitting of the equations confirmed the significant effect of the health expenditure per capita and CO2 emission on the economic growth of both groups of countries. One percent change in these expenditures resulted in 0.029 percent economic growth in the developed countries and 0.054 percent in the developing. Also, the effect of CO2 release on the economic growth was -0.011 and -0.073.
Conclusion: Health has a direct impact on economic growth. Health has a positive effect on the economic growth by reducing health costs (and spending these resources in other areas) and by increasing labor productivity through increasing life expectancy and useful work time. Also, increasing air pollution has a negative effect on the economic growth of these countries.
