Nidhi Hans - Academia.edu (original) (raw)

Papers by Nidhi Hans

Research paper thumbnail of Valorization of microalgal biomass to value-added products using integrated supercritical CO2 extraction and sub-critical hydrothermal liquefaction

Journal of Cleaner Production

Research paper thumbnail of Uncovering the phytochemicals of root exudates and extracts of lead (Pb) tolerant Chrysopogon zizanioides (L.) Roberty in response to lead contamination and their effect on the chemotactic behavior of rhizospheric bacteria

Environmental Science and Pollution Research, 2022

The chemical composition of root exudates and root extracts from Chrysopogon zizanioides (L.) Rob... more The chemical composition of root exudates and root extracts from Chrysopogon zizanioides (L.) Roberty cv KS-1 was determined in the presence of lead [Pb(II)]. Hitherto, no information is available in the literature concerning the phytochemical components of root exudates of C. zizanioides. Significantly higher concentrations of total carbohydrates (26.75 and 42.62% in root exudates and root extract, respectively), reducing sugars (21.46 and 56.11% in root exudates and root extract, respectively), total proteins (9.22 and 23.70% in root exudates and root extract, respectively), total phenolic acids (14.69 and 8.33% in root exudates and root extract, respectively), total flavonoids (14.30 and 12.28% in root exudates and root extract, respectively), and total alkaloids (12.48 and 7.96% in root exudates and root extract, respectively) were observed in samples from plants growing under Pb(II) stress in comparison to the respective controls. GC–MS profiling showed the presence of a diverse group of compounds in root exudates and extracts, including terpenes, alkaloids, flavonoids, carotenoids, plant hormones, carboxylic/organic acids, and fatty acids. Among the detected compounds, many have an important role in plant development, regulating rhizosphere microbiota and allelopathy. Furthermore, the results indicated that C. zizanioides exudates possess a chemotactic response for rhizospheric bacterial strains Bacillus licheniformis, Bacillus subtilis, and Acinetobacter junii Pb1.

Research paper thumbnail of Recent evolution in green technologies for effective valorization of food and agricultural wastes

Emerging Trends to Approaching Zero Waste, 2022

Research paper thumbnail of Sorption of pharmaceutical and personal care products from the wastewater by carbonaceous materials

Emerging Trends to Approaching Zero Waste, 2021

Research paper thumbnail of Uncovering the Phytochemicals of Root Exudates and Extracts of Lead (Pb) Hyperaccumulator Vetiveria Zizanioides (L.) in Response to Lead Contamination and their Effect on the Chemotactic Behaviour of Rhizospheric Bacteria

Chemical composition of root exudates and root extracts from V. zizanioides cv KS-1 was determine... more Chemical composition of root exudates and root extracts from V. zizanioides cv KS-1 was determined, in the presence of lead [Pb(II)]. Hitherto, no information is available in the literature concerning the phytochemical components of root exudates of Vetiver zizanioides. Significantly higher concentrations of total carbohydrates (26.75 and 42.62% in root exudates and root extract, respectively), reducing sugars (21.46 and 56.11% in root exudates and root extract, respectively), total proteins (9.22 and 23.70% in root exudates and root extract, respectively), total phenolic acids (14.69 and 8.33% in root exudates and root extract, respectively), total flavonoids (14.30 and 12.28% in root exudates and root extract, respectively) and total alkaloids (12.48 and 7.96% in root exudates and root extract, respectively) were observed in samples from plants growing under Pb(II) stress in comparison to the respective controls. GC-MS profiling showed the presence of diverse group of compounds in...

Research paper thumbnail of Title A review of phytoremediation technology : heavy metals uptake by plants

s Lead accumulation in soils is of serious concern in agricultural production due to the harmful ... more s Lead accumulation in soils is of serious concern in agricultural production due to the harmful effects on soil microflora, crop growth and food safety. In soil, speciation of lead greatly affects its bioavailability and thus its toxicity on plants and microbes. Many plants and bacteria have evolved to develop detoxification mechanisms to counter the toxic effect of lead. Factors influencing the lead speciation include soil pH, organic matter, presence of various amendments, clay minerals and presence of organic colloids and iron oxides. Unlike, other metals little is known about the speciation and mobility of lead in soil. This review focuses on the speciation of lead in soil, its mobility, toxicity, uptake and detoxification mechanisms in plants and bacteria and bioremediation strategies for remediation of lead contaminated repositories.

Research paper thumbnail of An Insight into Biological and Chemical Technologies for Micropollutant Removal from Wastewater

Fate and Transport of Subsurface Pollutants, 2020

Research paper thumbnail of A critical review on speciation, mobilization and toxicity of lead in soil-microbe-plant system and bioremediation strategies

Ecotoxicology and environmental safety, 2018

Lead accumulation in soils is of serious concern in agricultural production due to the harmful ef... more Lead accumulation in soils is of serious concern in agricultural production due to the harmful effects on soil microflora, crop growth and food safety. In soil, speciation of lead greatly affects its bioavailability and thus its toxicity on plants and microbes. Many plants and bacteria have evolved to develop detoxification mechanisms to counter the toxic effect of lead. Factors influencing the lead speciation include soil pH, organic matter, presence of various amendments, clay minerals and presence of organic colloids and iron oxides. Unlike, other metals little is known about the speciation and mobility of lead in soil. This review focuses on the speciation of lead in soil, its mobility, toxicity, uptake and detoxification mechanisms in plants and bacteria and bioremediation strategies for remediation of lead contaminated repositories.

Research paper thumbnail of Evaluation of the cytotoxicity and interaction of lead with lead resistant bacterium Acinetobacter junii Pb1

Brazilian Journal of Microbiology, 2019

This study explores the potential of lead resistant bacterium Acinetobacter junii Pb1 for adsorpt... more This study explores the potential of lead resistant bacterium Acinetobacter junii Pb1 for adsorption/accumulation of lead using various techniques. In the present work, growth of A. junii Pb1 was investigated in the presence of a range of Pb(II) concentrations (0, 100, 250, 500, and 1000 mg l −1). Lead was found to have no toxic effect on the growth of A. junii Pb1 at 100 and 250 mg l −1 concentrations. However, further increase in Pb(II) concentration (500 mg l −1) showed increase in lag phase, though growth remained unaffected and significant growth inhibition was observed when concentration was increased to 1000 mg l −1. Same was confirmed by the observations of flow cytometry. Further, the effect of Pb(II) on A. junii Pb1 was evaluated by using fluorescence microscopy, spectrofluorimetry, and flow cytometry. The spectrofluorimetry and fluorescence microscopy results revealed the accumulation of Pb(II) inside the bacterial cells as evident by green fluorescence due to lead binding fluorescent probe, Leadmium Green AM dye. Flow cytometry observations indicate an increase in cell size and granularity of exposure to lead. Thus, present work provides a new understanding of Pb(II) tolerance in A. junii Pb1 and its potential use in remediation of lead from contaminated soil.

Research paper thumbnail of Algal-derived physiologically active nutraceuticals : Dietary supplements, vitamins, carotenoids, fatty acids and other novel products

Research paper thumbnail of Valorization of microalgal biomass to value-added products using integrated supercritical CO2 extraction and sub-critical hydrothermal liquefaction

Journal of Cleaner Production

Research paper thumbnail of Uncovering the phytochemicals of root exudates and extracts of lead (Pb) tolerant Chrysopogon zizanioides (L.) Roberty in response to lead contamination and their effect on the chemotactic behavior of rhizospheric bacteria

Environmental Science and Pollution Research, 2022

The chemical composition of root exudates and root extracts from Chrysopogon zizanioides (L.) Rob... more The chemical composition of root exudates and root extracts from Chrysopogon zizanioides (L.) Roberty cv KS-1 was determined in the presence of lead [Pb(II)]. Hitherto, no information is available in the literature concerning the phytochemical components of root exudates of C. zizanioides. Significantly higher concentrations of total carbohydrates (26.75 and 42.62% in root exudates and root extract, respectively), reducing sugars (21.46 and 56.11% in root exudates and root extract, respectively), total proteins (9.22 and 23.70% in root exudates and root extract, respectively), total phenolic acids (14.69 and 8.33% in root exudates and root extract, respectively), total flavonoids (14.30 and 12.28% in root exudates and root extract, respectively), and total alkaloids (12.48 and 7.96% in root exudates and root extract, respectively) were observed in samples from plants growing under Pb(II) stress in comparison to the respective controls. GC–MS profiling showed the presence of a diverse group of compounds in root exudates and extracts, including terpenes, alkaloids, flavonoids, carotenoids, plant hormones, carboxylic/organic acids, and fatty acids. Among the detected compounds, many have an important role in plant development, regulating rhizosphere microbiota and allelopathy. Furthermore, the results indicated that C. zizanioides exudates possess a chemotactic response for rhizospheric bacterial strains Bacillus licheniformis, Bacillus subtilis, and Acinetobacter junii Pb1.

Research paper thumbnail of Recent evolution in green technologies for effective valorization of food and agricultural wastes

Emerging Trends to Approaching Zero Waste, 2022

Research paper thumbnail of Sorption of pharmaceutical and personal care products from the wastewater by carbonaceous materials

Emerging Trends to Approaching Zero Waste, 2021

Research paper thumbnail of Uncovering the Phytochemicals of Root Exudates and Extracts of Lead (Pb) Hyperaccumulator Vetiveria Zizanioides (L.) in Response to Lead Contamination and their Effect on the Chemotactic Behaviour of Rhizospheric Bacteria

Chemical composition of root exudates and root extracts from V. zizanioides cv KS-1 was determine... more Chemical composition of root exudates and root extracts from V. zizanioides cv KS-1 was determined, in the presence of lead [Pb(II)]. Hitherto, no information is available in the literature concerning the phytochemical components of root exudates of Vetiver zizanioides. Significantly higher concentrations of total carbohydrates (26.75 and 42.62% in root exudates and root extract, respectively), reducing sugars (21.46 and 56.11% in root exudates and root extract, respectively), total proteins (9.22 and 23.70% in root exudates and root extract, respectively), total phenolic acids (14.69 and 8.33% in root exudates and root extract, respectively), total flavonoids (14.30 and 12.28% in root exudates and root extract, respectively) and total alkaloids (12.48 and 7.96% in root exudates and root extract, respectively) were observed in samples from plants growing under Pb(II) stress in comparison to the respective controls. GC-MS profiling showed the presence of diverse group of compounds in...

Research paper thumbnail of Title A review of phytoremediation technology : heavy metals uptake by plants

s Lead accumulation in soils is of serious concern in agricultural production due to the harmful ... more s Lead accumulation in soils is of serious concern in agricultural production due to the harmful effects on soil microflora, crop growth and food safety. In soil, speciation of lead greatly affects its bioavailability and thus its toxicity on plants and microbes. Many plants and bacteria have evolved to develop detoxification mechanisms to counter the toxic effect of lead. Factors influencing the lead speciation include soil pH, organic matter, presence of various amendments, clay minerals and presence of organic colloids and iron oxides. Unlike, other metals little is known about the speciation and mobility of lead in soil. This review focuses on the speciation of lead in soil, its mobility, toxicity, uptake and detoxification mechanisms in plants and bacteria and bioremediation strategies for remediation of lead contaminated repositories.

Research paper thumbnail of An Insight into Biological and Chemical Technologies for Micropollutant Removal from Wastewater

Fate and Transport of Subsurface Pollutants, 2020

Research paper thumbnail of A critical review on speciation, mobilization and toxicity of lead in soil-microbe-plant system and bioremediation strategies

Ecotoxicology and environmental safety, 2018

Lead accumulation in soils is of serious concern in agricultural production due to the harmful ef... more Lead accumulation in soils is of serious concern in agricultural production due to the harmful effects on soil microflora, crop growth and food safety. In soil, speciation of lead greatly affects its bioavailability and thus its toxicity on plants and microbes. Many plants and bacteria have evolved to develop detoxification mechanisms to counter the toxic effect of lead. Factors influencing the lead speciation include soil pH, organic matter, presence of various amendments, clay minerals and presence of organic colloids and iron oxides. Unlike, other metals little is known about the speciation and mobility of lead in soil. This review focuses on the speciation of lead in soil, its mobility, toxicity, uptake and detoxification mechanisms in plants and bacteria and bioremediation strategies for remediation of lead contaminated repositories.

Research paper thumbnail of Evaluation of the cytotoxicity and interaction of lead with lead resistant bacterium Acinetobacter junii Pb1

Brazilian Journal of Microbiology, 2019

This study explores the potential of lead resistant bacterium Acinetobacter junii Pb1 for adsorpt... more This study explores the potential of lead resistant bacterium Acinetobacter junii Pb1 for adsorption/accumulation of lead using various techniques. In the present work, growth of A. junii Pb1 was investigated in the presence of a range of Pb(II) concentrations (0, 100, 250, 500, and 1000 mg l −1). Lead was found to have no toxic effect on the growth of A. junii Pb1 at 100 and 250 mg l −1 concentrations. However, further increase in Pb(II) concentration (500 mg l −1) showed increase in lag phase, though growth remained unaffected and significant growth inhibition was observed when concentration was increased to 1000 mg l −1. Same was confirmed by the observations of flow cytometry. Further, the effect of Pb(II) on A. junii Pb1 was evaluated by using fluorescence microscopy, spectrofluorimetry, and flow cytometry. The spectrofluorimetry and fluorescence microscopy results revealed the accumulation of Pb(II) inside the bacterial cells as evident by green fluorescence due to lead binding fluorescent probe, Leadmium Green AM dye. Flow cytometry observations indicate an increase in cell size and granularity of exposure to lead. Thus, present work provides a new understanding of Pb(II) tolerance in A. junii Pb1 and its potential use in remediation of lead from contaminated soil.

Research paper thumbnail of Algal-derived physiologically active nutraceuticals : Dietary supplements, vitamins, carotenoids, fatty acids and other novel products