Author
Jayanta Kumar Datta
Other affiliations: University of Pittsburgh, St George's Hospital
Bio: Jayanta Kumar Datta is an academic researcher from University of Burdwan. The author has contributed to research in topics: Biofertilizer & Fluoride. The author has an hindex of 24, co-authored 69 publications receiving 1731 citations. Previous affiliations of Jayanta Kumar Datta include University of Pittsburgh & St George's Hospital.
Topics: Biofertilizer, Fluoride, Adsorption, Shoot, Fertilizer
Papers published on a yearly basis
Papers
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TL;DR: The temporal relationship between the concentrations of luteinizing hormone (LH) and progesterone in peripheral plasma has been determined during the course of the normal human menstrual cycle and increased rapidly after the midcycle surge of LH.
Abstract: The temporal relationship between the concentrations of luteinizing hormone (LH) and progesterone in peripheral plasma has been determined during the course of the normal human menstrual cycle. Daily plasma samples were assayed, in duplicate, for progesterone by the competitive protein-binding method of Murphy (0.5 ml aliquots of plasma) and for LH by a radioimmunologic procedure (0.1 ml aliquots of plasma). Plasma progesterone levels remained consistently low (<0.2-1.8 mμg/ml) during the first half of the cycle and did not begin to rise until after the midcycle surge of LH became fully evident. Following the decline in plasma LH concentrations, the plasma progesterone levels increased rapidly, reaching maximal concentrations of 10–19 mμg/ml in 3–5 days. Progesterone concentrations remained elevated for 4–6 days and then fell abruptly to the initial low levels approximately 24 hr before the onset of menstruation without concomitant changes in LH concentration.
263 citations
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TL;DR: In this paper, a new medium, eggshell powder has been developed for fluoride removal from aqueous solution, where adsorption was found to be pH dependent with maximum removal efficiency at 6.0.
Abstract: A new medium, eggshell powder has been developed for fluoride removal from aqueous solution. Fluoride adsorption was studied in a batch system where adsorption was found to be pH dependent with maximum removal efficiency at 6.0. The experimental data was more satisfactorily fitted with Langmuir isotherm model. The kinetics and the factor controlling adsorption process fully accepted by pseudo-second-order model were also discussed. Ea was found to be 45.98 kJmol-1 by using Arrhenius equation, indicating chemisorption nature of fluoride onto eggshell powder. Thermodynamic study showed spontaneous nature and feasibility of the adsorption process with negative enthalpy (∆H0) value also supported the exothermic nature. Batch experiments were performed to study the applicability of the adsorbent by using fluoride contaminated water collected from affected areas. These results indicate that eggshell powder can be used as an effective, low-cost adsorbent to remove fluoride from aqueous solution as well as groundwater.
162 citations
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TL;DR: In this paper, a comparison of groundwater quality in relation to drinking water quality standards proves that most of the water samples are suitable for drinking water purpose whereas groundwater in some areas of the district has high salinity and high sodium adsorption ratio (SAR), indicating unsuitability for irrigation water and needs adequate drainage.
Abstract: Hydrogeochemical investigations are carried out in the different blocks of Burdwan district, West Bengal, India in order to assess its suitability for drinking as well as irrigation water purpose. Altogether 49 representative groundwater samples are collected from bore wells and the water chemistry of various ions viz. Ca2+, Mg2+, Na+, K+, CO
3
2−
, HCO
3
−
, Cl−, SO
4
2−
and NO
3
−
are carried out. The chemical relationships in Piper and Gibbs diagram suggest that the groundwater mainly belongs to alkali type and Cl− group and are controlled by rock dominance. A comparison of groundwater quality in relation to drinking water quality standards proves that most of the water samples are suitable for drinking water purpose whereas groundwater in some areas of the district has high salinity and high sodium adsorption ratio (SAR), indicating unsuitability for irrigation water and needs adequate drainage.
105 citations
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TL;DR: In this article, the effect of exposure to biomass smoke on various health status including blood pressure, gaseous component and ventilation pattern of kitchen and living room was assessed, and correlation study showed a strong negative relationship between CO and humidity.
Abstract: Emissions from biomass combustion are a major source of indoor and outdoor air pollution, and are estimated to cause millions of premature deaths worldwide annually. In this study, we assessed the effect of exposure to biomass smoke on various health status including blood pressure, gaseous component and ventilation pattern of kitchen and living room. For this investigation, a number of measurements were done to obtain indoor air quality (IAQ) data (indoor humidity, temperature, CO, CO2 and O3 concentration). Blood pressure was measured at baseline and one hour post-exposure. Results highlighted that a higher concentration of CO2 was released during burning of dry leaf, straw, cow dung compared to that from straw and LPG gas. Moreover, correlation study showed a strong negative relationship between CO and humidity (r = −0.609, p
80 citations
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TL;DR: Silver nanoparticles from aqueous root extract of Parthenium hysterophorus are synthesized and characterized and the potentiality of synthesized silver nanoparticles as larvacidal agent against Culex quinquefasciatus is evaluated.
77 citations
Cited by
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TL;DR: A case study explores the background of the digitization project, the practices implemented, and the critiques of the project, which aims to provide access to a plethora of information to EPA employees, scientists, and researchers.
Abstract: The Environmental Protection Agency (EPA) provides access to information on a variety of topics related to the environment and strives to inform citizens of health risks. The EPA also has an extensive library network that consists of 26 libraries throughout the United States, which provide access to a plethora of information to EPA employees, scientists, and researchers. The EPA implemented a reorganization project to digitize their materials so they would be more accessible to a wider range of users, but this plan was drastically accelerated when the EPA was threatened with a budget cut. It chose to close and reduce the hours and services of some of their libraries. As a result, the agency was accused of denying users the “right to know” by making information unavailable, not providing an adequate strategic plan, and discarding vital materials. This case study explores the background of the digitization project, the practices implemented, and the critiques of the project.
2,588 citations
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TL;DR: The influence of spray programs on the fauna of apple orchards in Nova Scotia XIV and its relation to the natural control of the oyster shell scale Lepidosaphes ulmi L.
Abstract: B6nassy, C., 1955. R6marques sur deux Aphelinid6s: Aphelinus mytilaspidis Le Baron et Aphytis proclia Walker. Annls l~piphyt. 6: 11-17. Lord, F. T. & MacPhee, A. W., 1953. The influence of spray programs on the fauna of apple orchards in Nova Scotia II. Oyster shell scale. Can. Ent. 79: 196-209. Pickett, A. D., 1946. A progress report on long term spray programs. Rep. Nova Scotia Fruit Grow. Ass. 83 : 27-31. Pickett, A. D., 1967. The influence of spray programs on the fauna of apple orchards in Nova Scotia XIV. Can. Ent. 97: 816-821. Tothill, J. D., 1918. The predacious mite Hemisarcoptes malus Shimer and its relation to the natural control of the oyster shell scale Lepidosaphes ulmi L. Agric. Gaz. Can. 5 : 234-239.
1,506 citations
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TL;DR: In this article, the authors introduce the radical approach of applying alkaline anion-exchange membranes (AAEMs) to meet the current challenges with regards to direct methanol fuel cells (DMFCs).
Abstract: This article introduces the radical approach of applying alkaline anion-exchange membranes (AAEMs) to meet the current challenges with regards to direct methanol fuel cells (DMFCs). A review of the literature is presented with regards to the testing of fuel cells with alkaline membranes (fuelled with hydrogen or methanol) and also to candidate alkaline anion-exchange membranes for such an application. A brief review of the directly related patent literature is also included. Current and future research challenges are identified along with potential strategies to overcome them. Finally, the advantages and challenges with the direct electrochemical oxidation of alternative fuels are discussed, along with how the application of alkaline membranes in such fuel cells may assist in improving performance and fuel efficiency.
1,157 citations