This paper presents a facile and effective method for the large-scale production of carbon dots (... more This paper presents a facile and effective method for the large-scale production of carbon dots (CDs) from diverse coconut wastes (fronds, husk and shell). On comparing two different methods, namely (i) hydrothermal carbonization and (ii) novel sequential synthesis processes (pyrolysis followed by sonication), the latter procedure recorded a higher recovery of CDs (14.0%) over the hydrothermal method (2.33%). Doping agents such as urea, polyethyleneimine (PEI) and hexamethylenetetramine (HMTA) were chosen at varying concentrations to synthesize surface-modified CDs (SMCDs) for enhanced antibacterial properties. Among these SMCDs, urea-doped CDs (1:1) @ 1000 ppm registered significantly higher cytotoxicity (20.6%) against Escherichia coli (E. coli). Subsequently, to assess the applicability of CDs as a disinfectant in water purification systems, two products, namely (i) CD-infused chitosan beads and (ii) pelletized CDs, were developed to ensure the immobilization of CDs. Studies with...
The most effective agricultural practice to prevent iron deficiency in calcareous soils is fertil... more The most effective agricultural practice to prevent iron deficiency in calcareous soils is fertilizing with synthetic chelates. These compounds are non-biodegradable, and persistent in the environment and hence there is a risk of leaching metals into the soil horizon. To tackle iron deficiency-induced chlorosis (IDC) in crops grown under calcareous soils, an environmentally friendly effective solutions are needed rather than chemical application as it affects the soil health further. Hence the present work aimed at isolating and screening calcareous soil-specific bacteria capable of producing the iron-chelating siderophores. Siderophore producing bacteria (SPB) was isolated from the rhizosphere of calcareous soil-grown groundnut (Arachis hypogea L.), of which seventeen bacterial isolates were positive for siderophore production assayed by Chrome Azurol Sulphonate. The performance of SPB isolates was compared for siderophore kinetics, level of siderophore production, type of sideroph...
International Journal of Environment and Climate Change
Aims: In the present study twenty groundnut genotypes are evaluated for their resistance to IDC a... more Aims: In the present study twenty groundnut genotypes are evaluated for their resistance to IDC and to identify feasible indicators for screening iron (Fe) efficient groundnut genotypes in calcareous soils based on the morphophysiological parameters at 45 days after sowing (DAS). Study Design: The experiment was replicated three times with two iron treatments (+Fe and – Fe) in a randomized block design Place and Duration of Study: Field screening of genotypes was carried during Kharif 2019 at Thondamuthur block, Coimbatore district (10°59’31.9” N 76°47’15.4 E), Tamil Nadu, India. Methodology: The randomized field experiment was comprised of two major factors, i) Fe status (with Fe, without Fe), and ii) genotypes (twenty) with differential IDC response. Seven morpho-physiological parameters associated with IDC resistance were evaluated in groundnut genotypes. Results: Under Fe deficit conditions, IDC efficient genotypes recorded significantly higher shoot dry weight, root dry weight,...
This paper presents a facile and effective method for the large-scale production of carbon dots (... more This paper presents a facile and effective method for the large-scale production of carbon dots (CDs) from diverse coconut wastes (fronds, husk and shell). On comparing two different methods, namely (i) hydrothermal carbonization and (ii) novel sequential synthesis processes (pyrolysis followed by sonication), the latter procedure recorded a higher recovery of CDs (14.0%) over the hydrothermal method (2.33%). Doping agents such as urea, polyethyleneimine (PEI) and hexamethylenetetramine (HMTA) were chosen at varying concentrations to synthesize surface-modified CDs (SMCDs) for enhanced antibacterial properties. Among these SMCDs, urea-doped CDs (1:1) @ 1000 ppm registered significantly higher cytotoxicity (20.6%) against Escherichia coli (E. coli). Subsequently, to assess the applicability of CDs as a disinfectant in water purification systems, two products, namely (i) CD-infused chitosan beads and (ii) pelletized CDs, were developed to ensure the immobilization of CDs. Studies with...
The most effective agricultural practice to prevent iron deficiency in calcareous soils is fertil... more The most effective agricultural practice to prevent iron deficiency in calcareous soils is fertilizing with synthetic chelates. These compounds are non-biodegradable, and persistent in the environment and hence there is a risk of leaching metals into the soil horizon. To tackle iron deficiency-induced chlorosis (IDC) in crops grown under calcareous soils, an environmentally friendly effective solutions are needed rather than chemical application as it affects the soil health further. Hence the present work aimed at isolating and screening calcareous soil-specific bacteria capable of producing the iron-chelating siderophores. Siderophore producing bacteria (SPB) was isolated from the rhizosphere of calcareous soil-grown groundnut (Arachis hypogea L.), of which seventeen bacterial isolates were positive for siderophore production assayed by Chrome Azurol Sulphonate. The performance of SPB isolates was compared for siderophore kinetics, level of siderophore production, type of sideroph...
International Journal of Environment and Climate Change
Aims: In the present study twenty groundnut genotypes are evaluated for their resistance to IDC a... more Aims: In the present study twenty groundnut genotypes are evaluated for their resistance to IDC and to identify feasible indicators for screening iron (Fe) efficient groundnut genotypes in calcareous soils based on the morphophysiological parameters at 45 days after sowing (DAS). Study Design: The experiment was replicated three times with two iron treatments (+Fe and – Fe) in a randomized block design Place and Duration of Study: Field screening of genotypes was carried during Kharif 2019 at Thondamuthur block, Coimbatore district (10°59’31.9” N 76°47’15.4 E), Tamil Nadu, India. Methodology: The randomized field experiment was comprised of two major factors, i) Fe status (with Fe, without Fe), and ii) genotypes (twenty) with differential IDC response. Seven morpho-physiological parameters associated with IDC resistance were evaluated in groundnut genotypes. Results: Under Fe deficit conditions, IDC efficient genotypes recorded significantly higher shoot dry weight, root dry weight,...
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Papers by kiran kalyan