Tarit Roychowdhury - Academia.edu (original) (raw)

Papers by Tarit Roychowdhury

Groundwater for Sustainable Development

EarthArXiv (California Digital Library), Jul 28, 2023

To minimize arsenic (74.92As 33) loading into rice plants, based on our two-year field trial we p... more To minimize arsenic (74.92As 33) loading into rice plants, based on our two-year field trial we propose adopting alternating wetting and drying (AWD) irrigation as a sustainable water management strategy allowing greater silicon (28.08Si 14) availability. Our field-based project is the first report on AWD's impact on As-Si distribution in fluvio-alluvial soils of the entire Ganga valley (24 study sites, six divisions), seasonal variance (pre-monsoon and monsoon), rice plant anatomy and productivity, soil microbial diversity, microbial gene ontology profiling and associated metabolic pathways. Under AWD to flooded and pre-monsoon to monsoon cultivations, respectively, As-bioavailability was reduced by 8.71±0.014-9.25±0.019% and 25.68±0.088-26.13±0.0921%. In the pre-monsoon and monsoon seasons, the rice grain yield under AWD improved by 8.41±0.075% and 9.96±0.069%, proving the economic profitability. Compared to waterlogging, AWD evidences as an optimal soil condition for supporting soil microbial communities in rice fields, allowing diverse metabolic activities, including Asresistance, and active expression of As-responsive genes and gene products. Finally, we propose that by using AWD, the use of groundwater can be reduced, lowering the cost of pumping and field management and generating an economic profit for farmers. These combined assessments prove the acceptability of AWD for the establishment of multiple sustainable development goals (SDGs). Keywords-Alternate wetting-drying; sustainable agriculture; rice productivity; economic profit; high throughput sequencing; gene ontology; microbial metabolism Synopsis statement-Sustainable water management in rice cultivation reduces arsenic contamination and increases productivity while promoting soil microbial metabolic activities, gene expressions and economic profit for the farmers.

World Journal of Microbiology & Biotechnology, Aug 4, 2023

Zenodo (CERN European Organization for Nuclear Research), Jan 31, 1992

The debydrogeaatloa readloa of CpMnCo(C0)6PPbH with Fe,(CO), •. Ra,(CO), •. Co.(CO). and CpMa(CO)... more The debydrogeaatloa readloa of CpMnCo(C0)6PPbH with Fe,(CO), •. Ra,(CO), •. Co.(CO). and CpMa(CO), were performed botb In benzeae and tolueae medium aad the compounds CpCo,(C0)6 (1',•PPb) and Cp,Co4 • (CO).(p,•C0)(,.,4-PPb), aloag witb few other already kaowa products were Isolated Tbe compounds were cbarac• Cerised by elemeatal analysis, ir, •H nmr and mass spectral studies

Total exposure of fluoride from food composites and drinking water, used by the family members in... more Total exposure of fluoride from food composites and drinking water, used by the family members in the fluoride-affected areas of Berhait block in Sahibganj district has been investigated. Mean fluoride concentration in groundwater samples, used for drinking purposes by the villagers was 2.5 mg/l (range = 0.95-6.9 mg/l, n = 30). Mean fluoride concentrations in vegetables and crops were 8.87 mg/kg (range: 0.44-21.7 mg/kg, n = 111) and 8.64 mg/kg (mean = 2.11-18 mg/kg, n = 49), respectively. High accumulation of fluoride in rice grain was significant (mean = 14.6 mg/kg, n = 20). A considerable amount of fluoride in the water soluble part of edible herbs was observed (mean = 6.35 mg/kg, n = 20). Higher concentration of fluoride was absorbed by the skin of vegetables, compared to the fleshy material. Mean fluoride concentration in shallow tubewell waters, used for agricultural irrigation in the study area was 1.9 mg/l (range = 1.05-5.45 mg/l; n = 9). The upper layer agricultural land soils contained a high concentration of fluoride (mean = 55 mg/kg, range = 43-101 mg/kg, n = 16). Average dietary intakes of fluoride by adult and children (approximately 10 years of age) were 408 and 484 µg/kg body wt./day, respectively, which were much higher compared to the WHO recommended Provisional Tolerable Daily Intake (PTDI) value of inorganic fluoride. Rice contributed 78% and 75%, of fluoride, with respect to the total intakes of fluoride from all food composites by adult and children, respectively. Clinical features of fluorosis have been observed in the studied population.

Science of The Total Environment, Aug 1, 2023

Molecular Nutrition & Food Research, May 1, 2009

Since 1988 we have analyzed 140 150 water samples from tube wells in all 19 districts of West Ben... more Since 1988 we have analyzed 140 150 water samples from tube wells in all 19 districts of West Bengal for arsenic; 48.1% had arsenic above 10 lg/L (WHO guideline value), 23.8% above 50 lg/L (Indian Standard) and 3.3% above 300 lg/L (concentration predicting overt arsenical skin lesions). Based on arsenic concentrations we have classified West Bengal into three zones: highly affected (9 districts mainly in eastern side of Bhagirathi River), mildly affected (5 districts in northern part) and unaffected (5 districts in western part). The estimated number of tube wells in 8 of the highly affected districts is 1.3 million, and estimated population drinking arsenic contaminated water above 10 and 50 lg/L were 9.5 and 4.2 million, respectively. In West Bengal alone, 26 million people are potentially at risk from drinking arsenic-contaminated water (above 10 lg/L). Studying information for water from different depths from 107 253 tube wells, we noted that arsenic concentration decreased with increasing depth. Measured arsenic concentration in two tube wells in Kolkata for 325 and 51 days during 2002-2005, showed 15% oscillatory movement without any long-term trend. Regional variability is dependent on sub-surface geology. In the arsenic-affected flood plain of the river Ganga, the crisis is not having too little water to satisfy our needs, it is the crisis of managing the water.

Environmental Science and Pollution Research, May 9, 2023

Applied Organometallic Chemistry, 2002

Arsenic contamination of groundwater and associated medical problems have long been reported in t... more Arsenic contamination of groundwater and associated medical problems have long been reported in the Mushidabad district, one of nine arsenic-affected districts in West Bengal, India. In order to estimate people's total exposure to arsenic, we visited 12 arsenic-affected families in that area during 4±7 December 2000 and collected seven tubewell waters used for drinking, cooking and other household purposes and 51 urine samples from those families. The arsenic concentrations in drinking water ranged from 2.7 to 170 ppb. Those families designated A±E, G±I and J took in arsenic concentrations of 72.6 ppb, 154 ppb and 170 ppb respectively. The concentrations of arsenite, arsenate, monomethylarsonic acid (MMA) and dimethylarsinic acid (DMA) in urine (corrected for creatinine level in the urine), obtained from 51 persons, ranged from 0 to 796.9 ppb (mg creatinine/ml urine) À1 , from 0 to 1635.2 ppb (mg creatinine/ml urine) À1 , from 2.1 to 411.0 ppb (mg creatinine/ml urine) À1 and from 8.3 to 2017.5 ppb (mg creatinine/ml urine) À1 respectively. The average concentration of total arsenic was 59.2 ppb (mg creatinine/ml urine) À1. On comparison of the ratios of (MMA DMA) to total arsenic, the average proportion of (MMA DMA) was 83.2%, but the proportions were 27.3% and 16.5% for two of the children (2 years old and 13 years old respectively). This result suggested that they might be damaged due to the methylating capacity. When estimating arsenic species in urine obtained from families A±E, G±I and J, these family members normally metabolized the inorganic arsenic to MMA and DMA and eliminated these as such in comparison with an intake of inorganic arsenic from the tubewell water. The arsenic species in urine from people having the same food and life habits showed the same profile in both men and women. There was a good correlation (p < 0.05) between the ages of 19 persons in families A±E and the values of (MMA DMA) or total arsenic in urine.

CRC Press eBooks, Oct 14, 2022

Springer eBooks, Dec 3, 2022

Journal of Health Science, 2003

Arsenic-contamination of groundwater has long been reported in Mushidabad district of West Bengal... more Arsenic-contamination of groundwater has long been reported in Mushidabad district of West Bengal, India. We visited 19 arsenic-affected families and 4 non-arsenic-affected families in that area during 20-22 February 2001 and collected 10 tubewell waters used for drinking and cooking and 89 urines from those families. The arsenic concentrations in waters ranged from 0.64 to 75.5 ppb. The average of arsenite, arsenate, monomethylarsonic acid (MMA) and dimethylarsinic acid (DMA) in urine were 23.1, 59.0, 24.6 and 127.4 ng/ml urine, respectively. The average of total arsenic was 234.1 ng/ml urine. On comparison of the ratio of (MMA + DMA) to total arsenic, the average proportion of (MMA + DMA) was 75.7%, but the proportions were from 4.2 to 57.2% for 11 persons. This result suggests that they might be damaged due to the arsenic-methylating capacity. When selecting the members of A to L families because of using the two same tubewell waters except 5 persons due to the luck of enough arsenicmethylating capacity, there were the good relationships (p < 0.01) between As(III) and MMA, As(III) and DMA, MMA and DMA, and DMA and total arsenic. The relationship between the arsenic concentration in tubewell waters and the averages of the total arsenic obtained from each families was not in agreement (p > 0.05). The result suggests the possibility of the contribution of other sources like foodstuffs regarding to the excretion of arsenic species from the urines.

Biocatalysis and agricultural biotechnology, Nov 1, 2021

The green synthesis of nanoparticles is a convenient, inexpensive, rapid and eco-friendly method ... more The green synthesis of nanoparticles is a convenient, inexpensive, rapid and eco-friendly method compared to traditional synthesis methods. We synthesized iron oxide nanoparticles (a-Fe 2 O 3 (hematite)) nanoparticles from iron (III) chloride using an aqueous extract of Psoralea corylifolia seeds as a reducing agent. Various characterization methods indicate that nanoparticles were crystalline with an average size of *39 nm. The nanoparticles were assessed for their catalytic activity on methylene blue using a UV-Vis spectrophotometer and showed a rapid reduction within 63 min. The in vitro anticancer activity of the nanoparticles was also determined by Sulforhodamine (SRB) assay, and caspase-3 expression was determined using caspase-3 fluorescence and immunofluorescence assays. The results were suggested the strong cancer cell growth inhibition in a dose-dependent manner. Keywords Green synthesis Á Iron oxide nanoparticles Á Psoralea corylifolia Á Catalytic activity Á In-vitro anticancer activity P.C. Nagajyoth and Muthuraman Pandurangan has contributed equally to this work.

New Journal of Chemistry

A Schiff-base molecule (H4L) derived from bisphenol A is a selective and sensitive chemosensor fo... more A Schiff-base molecule (H4L) derived from bisphenol A is a selective and sensitive chemosensor for Al3+ and is used in the imaging of the cations in plant roots.

Biological Trace Element Research

Environmental science and engineering, Dec 3, 2022