Heavy metal contamination in river water and sediments of the Swarnamukhi River Basin, India: risk assessment and environmental implications

Patel, Priyanka; Raju, N. Janardhana; Reddy, B. C. Sundara Raja; Suresh, U.; Sankar, D B; Reddy, Tirumuru V.

doi:10.1007/s10653-017-0006-7

Cited by 154 publications

(56 citation statements)

References 36 publications

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“…River is an important natural resource and played a crucial role in human civilization. Many reports have confirmed the severe contamination of major as well as minor rivers with heavy metals and other toxic chemicals in India (Siddiqui and Pandey 2019; Patel et al 2018;Singh and Giri 2018). Mercury contamination in river water poses serious health issues to human beings and to other water living bodies such as plants and fishes (Officioso et al 2016;Dash and Das 2015).…”

Section: Introductionmentioning

confidence: 99%

Bioremediation treatment process through mercury-resistant bacteria isolated from Mithi river

2019

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Unorganized development all over the world has resulted in the deterioration of the environment. The Mithi river located in Mumbai area is also one of the victims of this unorganized development. It has become a dumping site for industrial effluents, which contains various toxic materials including heavy metals such as mercury, chromium, arsenic. Physicochemical analysis of the Mithi river water samples has confirmed the deterioration of river water. Various parameters of Mithi river water such as electrical conductivity (EC), total dissolved salts (TDS), salinity, chemical oxygen demand (COD) and biological oxygen demand (BOD) were found to be higher than the normal values prescribed for the river water. In the present study, mercury-resistant bacteria were isolated from Mithi river and identified by biochemical and molecular analysis. The molecular identification of the mercury-resistant bacteria was done by 16S rDNA identification, which were identified as Bacillus sp. strain CSB_B078, Klebsiella pneumoniae strain FY2, Klebsiella pneumoniae isolate 23, Enterobacter sp. strain Amic_7, Enterobacter sp. strain 08, Acinetobacter seohaensis strain S34, Acinetobacter sp. 815B5_12ER2A. Mercury-resistant bacteria were isolated from both low-and high-salinity sites of Mithi river. The minimum inhibitory concentration of bacterial isolates against mercury was determined. Bacterial isolates could tolerate and grow in the presence of 700 ppm mercury and could also tolerate a high salinity of 35 ppt of NaCl. Resistance of bacterial isolates to high concentration of mercury and high-salinity stress suggests that the bacterial isolates could be an efficient candidate for bioremediation of mercury.

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Section: Introductionmentioning

confidence: 99%

Bioremediation treatment process through mercury-resistant bacteria isolated from Mithi river

2019

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“…Neutralizing IgM antibodies toward HHV6 develop during acute exantham subitum (15). Virus-specific CD4 + and CD8 + T-cells are present in adults without HHV6 viremia, presumably due to prior exposure to the virus (16, 17). However, the relative importance of these cell types during acute HHV6 infection or reactivation is unclear.…”

Section: Introductionmentioning

confidence: 99%

CD8+ T Cells Prevent Lethality from Neonatal Murine Roseolovirus Infection

Patel

Yokoyama

2017

The Journal of Immunology

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A recently described mouse homolog of the human roseoloviruses, murine roseolovirus (MRV), causes loss of peripheral and thymic CD4+ cells during neonatal infection of BALB/c mice. Despite significant disruptions to the normal adaptive immune response, infected BALB/c mice reproducibly recover from infection, consistent with prior studies on a related virus, mouse thymic virus (MTV). Herein we show that in contrast to published studies on MTV, MRV appears to robustly infect neonatal C57BL/6 (B6) mice causing severe depletion of thymocytes and peripheral T-cells. Moreover, B6 mice recovered from infection. We investigated the mechanism of thymocyte and T-cell loss, determining that the major thymocyte subsets were infected with MRV, however CD4+ and CD4+CD8− showed increased apoptosis during infection. We found that CD8+ T-cells populated MRV-infected thymi. These CD8+ T cells expressed markers of activation, had restricted T-cell receptor repertoire and accumulated intracellular effector proteins, consistent with a cytotoxic lymphocyte phenotype, and suggesting their involvement in viral clearance. Indeed, absence of CD8+ T-cells prevented recovery from MRV infection and led to lethality in infected animals whereas B-cell deficient mice showed CD4+ T-cell loss but recovered from infection without lethality. Thus these results demonstrate that CD8+ T-cells are required for protective immunity against a naturally occurring murine pathogen that infects the thymus, and establish a novel infection model for MRV in B6 mice, providing the foundation for detailed future studies on MRV with the availability of innumerable mutant mice on the B6 background.

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“…Drinking water contamination is a serious natural calamity and public health risk that originates from both anthropogenic (industrial and domestic discharge, wastewater treatment plants, mining and agriculture) and geogenic (weathering and erosion of bedrocks and ore deposits) sources [2][3][4]. Among these sources, the discharge of industrial wastewater significantly alters water quality characteristics and contributes to water contamination [5,6].…”

Section: Introductionmentioning

confidence: 99%

Potentially toxic elements contamination in water and evaluation for risk assessment in the Rawalpindi, Pakistan

Khan¹,

Abeer²,

Hussain³

et al. 2019

Desalination and Water Treatment

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This study examined the groundwater and surface water quality for drinking and irrigation purposes in the Rawalpindi, Pakistan. For this purpose, samples were collected from groundwater (n = 30), surface water (River Soan, n = 27) and wastewater (n = 21). Each sample was analyzed for the physiochemical parameters and potentially toxic elements (PTE) concentrations. Results revealed that groundwater showed the lowest levels of physiochemical parameters and PTE contaminations, followed by the surface water (River Soan) and the highest in wastewater. The PTE contamination's levels in groundwater, River Soan and wastewater surpassed the national environmental quality standards (NEQs) set by Pakistan's environmental protection agency (Pak EPA). Groundwater (hand pump, bore well and tube well) sources were evaluated for the risk assessment of PTE consumption through drinking water. Among drinking water, the highest PTE contaminations were observed in hand pump water that led to higher average daily intake (ADI) (0.079 mg/kg-d) value for Zn and hazard quotient (HQ) value (11.7) for Cd. The HQ values of Cd were > 1 for all sources of drinking water. Higher HQ values of Cd could induce various acute and chronic health problems to exposed human population of study area.

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Heavy metal contamination in river water and sediments of the Swarnamukhi River Basin, India: risk assessment and environmental implications

Cited by 154 publications

References 36 publications

Bioremediation treatment process through mercury-resistant bacteria isolated from Mithi river

Bioremediation treatment process through mercury-resistant bacteria isolated from Mithi river

CD8+ T Cells Prevent Lethality from Neonatal Murine Roseolovirus Infection

Potentially toxic elements contamination in water and evaluation for risk assessment in the Rawalpindi, Pakistan

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