[show abstract][hide abstract] ABSTRACT: Fuel adulteration increases the emission of total hydrocarbons, carbon monoxide, nitrogen oxides and respirable particulate matter, and thus adds to air pollution. The study examined the effects of mixing of different percentage of kerosene with petrol on the motorized rickshaw exhausts in terms of volatile organic compounds (benzene, toluene, xylene and ethyl benzene) and total suspended particulate matter (SPM). The personal sampler was used for sampling, and gas chromatography-mass spectrometry for quantification of compounds. Concentration of volatile organic compounds significantly decreased (p < 0.001) along with the increase in fraction of kerosene in petrol. The level of benzene in exhausts while, using petrol (100%) was significantly higher (p < 0.001) than that of three combinations used in this study (75% petrol + 25% kerosene, 50% petrol + 50% kerosene and 25% petrol + 75% kerosene). Similar trend was observed for toluene, xylene and ethyl benzene also. The mean concentration of benzene, toluene, xylene and ethyl benzene were 31.34,160.93, 10.07 and 5.58 microg m(-3) in pure petrol, while 12.30, 51.41,4.89 and 3.16 microg m(-3) for fuel combination 75% petrol + 25% kerosene. The observed levels of benzene, toluene, xylene and ethyl benzene were 9.12, 41.04, 4.33 and 2.91 microg m(-3) for fuel mixture having 50% petrol with 50% kerosene and levels were 8.36, 20.05, 3.82 and 2.95 microg m(-3) were for 25% petrol with 75% kerosene fuel combination. The levels of suspended particulate matter (SPM) increased along with the increase in fraction of kerosene in petrol. The data generated is useful to understand the common volatile organic compounds trend with the increasing fraction of kerosene in petrol.
Journal of Environmental Biology 07/2012; 33(4):729-34. · 0.68 Impact Factor
[show abstract][hide abstract] ABSTRACT: Chewing mixture containing areca nut and tobacco is believed to be associated with oral cancer. Habit of chewing such mixture is prevalent among South Asian countries. This study aimed to evaluate the genotoxic effect of areca nut and tobacco on human lymphocytes. Peripheral blood from 107 subjects (nonchewers, 48; chewers, 59, including 20 subjects with oral submucous fibrosis [OSMF]) analyzed by cytokinesis-block micronucleus (CBMN) and alkaline comet assay. Nuclear anomalies, namely, binucleated cells with micronuclei (BN MN), total MN, nucleoplasmic bridge, and nuclear buds were higher in chewers whereas elevation in BN MN and total MN were significant among subjects with OSMF than nonchewers. DNA damage assessed by comet assay showed increased percentage of Tail DNA, Tail moment, and Olive tail moment among chewers as well as OSMF subjects. Significant positive correlation was observed between induction of CBMN and consumption of quids per day (r = .280, P = .033). RESULTS: suggested cytotoxic and genotoxic potential of mixture containing areca nut and tobacco.
Asia-Pacific Journal of Public Health 09/2011; 23(6):852-60. · 1.06 Impact Factor
[show abstract][hide abstract] ABSTRACT: To determine seminal antioxidant capacity, oxidative stress markers, and their association with semen quality as oxidative stress is considered to be a major etiological factor in male infertility.
Semen samples were obtained from 138 men and categorized on the basis of sperm count, motility, and morphology. Seminal oxidative and antioxidant markers are as follows: lipid peroxidation (LPO), protein carbonyls (PC), superoxide dismutase (SOD), catalase (CAT), thiols, and ascorbic acid were determined.
Sperm count significantly correlated positively with progressive sperm motility and normal morphology. Sperm count and normal morphology showed significant negative correlation with LPO and PC. Sperm count and progressive motility showed significant positive relationship with SOD. The SOD, CAT, and thiols positively whereas LPO and PC negatively associated with elevated sperm count.
Insufficient antioxidant enzymes and increased oxidative stress may attribute to the risk of declining semen quality and hence protective role for antioxidant enzymes against the oxidative damage cannot be ruled out.
[show abstract][hide abstract] ABSTRACT: We use campaign mode and continuous GPS data from 2005 to 2008 to examine the evolving strain pattern in Andaman Islands after the Great Sumatra–Andaman earthquake. Two and half years after the earthquake, the post-seismic period changes to inter-seismic period. At Port Blair, post-seismic displacement rate reduced to about 95% with clockwise rotation of azimuths and towards North Andaman, velocity vector gradually rotates towards north with drop in magnitude. The inter-seismic displacement was dominated by trench parallel movement. Strain calculations on inclined transpession model shows deformations at Andaman were highly heterogeneous both in post and inter-seismic periods with dominant strike-slip and dip-slip shearing along with layer parallel shortening and extension. Post-seismic and inter-seismic periods had suffered simultaneous subduction perpendicular extension and contraction leading to transtension and transpression deformational environments respectively. Occurrence of earthquakes during post and inter-seismic periods were results of interplay between simple shear and pure shear components of the strain matrix.Highlights► Andaman takes 2.5 years to attain inter-seismic period after the 2004 mega-earthquake. ► Post-seismic period shows subduction perpendicular extension leading to transtension. ► Transpressional deformation characterize inter-seismic period. ► Interplay between simple and pure shear results earthquakes during both the periods. ► Adopted strain analysis can explain better present strain evolution at subduction zone.
Journal of Asian Earth Sciences 01/2011; 42:38-50. · 2.38 Impact Factor
[show abstract][hide abstract] ABSTRACT: This lead exposure study was conducted in a total of 452 school children in the age group of 9-14 years. Two hundred and ninety-eight exposed children came from the villages situated within a 2.5 km radius of the lead-zinc mine whereas the comparative group children were selected from the villages at least 10 km away from mine. Environmental monitoring study suggested that lead levels in air and water samples near the mining areas were within the Central Pollution Control Board prescribed standards. Lead levels in about 80% of the children were less than 10 μg/dl. Medical examination of all children did not show any signs related to lead toxicity but central nervous system-related symptoms, as reported by the subjects during medical examination, were found to be higher in the exposed group when compared with the comparative group. The values of physical growth parameters of the exposed group were comparable with that of the comparative group for both girls and boys. Hence, the physical growth of children was found to be unaffected by the observed level of lead exposure. To safeguard the health of the children residing near the mining area, various preventive and control measures were suggested.
Indian journal of occupational and environmental medicine 08/2010; 14(2):58-62.
[show abstract][hide abstract] ABSTRACT: Water extract of respirable particulate matter (RPM) was analyzed by Ion chromatography technique to investigate the presence of nitrite (NO2) as secondary aerosol in ambient environment. The nitrite particulates undergo photo hydroxyl radical reaction in environment produce nitrous acid, which reacts with metal and absorbs on RPM as water-soluble metal salt. The mean concentration of nitrite was 20.86 microg m(-3) in ambient environment. Regression analysis showed that the relationship for respirable particulate matter and nitrite (RPM-NO2, R2 = 0.742) was positively significant. We are reporting the presence of nitrite as an aerosol in ambient environment.
Journal of Environmental Biology 05/2010; 31(3):375-8. · 0.68 Impact Factor
[show abstract][hide abstract] ABSTRACT: Several major earthquakes affected the stable continental Indian peninsular shield in recent past due to the activity of fault
movements. This necessitates identifying the active faults in the region for future monitoring. The far field co-seismic and
post-seismic effects of recent major earthquakes occurred at Sumatra, 2004, Pakistan, 2007 and Indonesia, 2007 on HYDE and
IISc IGS GPS stations were studied by small span GPS analysis. Different type of movement pattern on displacement components
ensure the reactivation of existing fault planes signifying an integral relationship between GPS displacement vectors and
geological structure of the region.
KeywordsGPS–Active Fault–Earthquake–Peninsular India
Journal of the Geological Society of India 01/2010; 76(5):485-492. · 0.57 Impact Factor
[show abstract][hide abstract] ABSTRACT: Carbon soot is produced in the process of diamond manufacture. Recent experimental and epidemiological studies have associated exposure to carbon nanoparticles with effects on cardiovascular system and blood cells. The objective of this study is to assess the cardiovascular effects consequent to chronic respiratory exposure of carbon soot. A cross-sectional occupational health survey was conducted in all consenting workers who employed in the production wing of diamond-processing industries. Blood pressure, ECGs, height, weight, and blood counts were measured and evaluated. Blood pressure measurements revealed a high prevalence of hypertension in young workers. Left atrial abnormality (LAA) was the major finding in the electrocardiograms. We found a high prevalence of hypertension in young diamond workers. The LASER saw operators had highest prevalence of LAA. White cell count and prevalence of hypertension was highest for the workers in grinder operations.
[show abstract][hide abstract] ABSTRACT: Coral microatolls were examined from North Andaman and Little Andaman to understand the relative sea level change due to vertical
tectonic deformation above the subduction interface. The highest level of survival of coral microatoll before the 26 December,
2004 earthquake at eastern coast of North Andaman has been determined by Global Ocean Tide Model. The present position of
recently dead flat top microatoll with preserved internal structure at the eastern coast of North Andaman mainland indicates
31.21 cm uplift due to the 26 December, 2004 earthquake. Comparatively old cup shaped microatoll at the eastern fringe of
North Andaman group of islands and highly bioeroded fossil microatolls at the intertidal zone of Little Andaman bear the signature
of permanent vertical deformation in the past.
Journal of Earth System Science 01/2009; 118(2):157-162. · 0.70 Impact Factor
[show abstract][hide abstract] ABSTRACT: No data are available with the labor departments among the workers of small-scale lead-based units with regard to lead poisoning. One hundred and ninety-five workers were investigated for lead exposure and three were found exceeding the limit of 80 mg/dL, which required a treatment for lead poisoning.
To assess the exposure and health risk in workers working in small lead-based units.
Random sampling is selected from the cross-sectional medical study.
Medical examination cum biochemical/hematological investigations along with blood lead estimation were carried out in these workers.
Epi-Info and SPSS 16.0 were used for statistical analysis.
Workers' blood lead levels were brought down from 114.4, 110.0 and 120.6 mg/dL with treatment of D-penicillamine to 40 mg/dL. It may be concluded that lead poisoning is a preventable public health problem that particularly affects the industrial workers in small lead-based units.
Indian journal of occupational and environmental medicine 12/2008; 12(3):139-41.