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Patnaik S, Bhattacharya D, Chakrabarti K, Saravanan B, Bhatt AK, Verma MB. A Note on the Occurrence of Hydrothermal Anhydrite (CaSO4) in Kanchankayi area, Bhima Basin, Yadgir District, Karnataka. PINSA 2020. [DOI: 10.16943/ptinsa/2020/154985] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Kashinski DO, Talbi D, Hickman AP, Di Nallo OE, Colboc F, Chakrabarti K, Schneider IF, Mezei JZ. A theoretical study of the dissociative recombination of SH + with electrons through the 2Π states of SH. J Chem Phys 2017; 146:204109. [PMID: 28571387 PMCID: PMC5449277 DOI: 10.1063/1.4983690] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Accepted: 05/05/2017] [Indexed: 11/15/2022] Open
Abstract
A quantitative theoretical study of the dissociative recombination of SH+ with electrons has been carried out. Multireference, configuration interaction calculations were used to determine accurate potential energy curves for SH+ and SH. The block diagonalization method was used to disentangle strongly interacting SH valence and Rydberg states and to construct a diabatic Hamiltonian whose diagonal matrix elements provide the diabatic potential energy curves. The off-diagonal elements are related to the electronic valence-Rydberg couplings. Cross sections and rate coefficients for the dissociative recombination reaction were calculated with a stepwise version of the multichannel quantum defect theory, using the molecular data provided by the block diagonalization method. The calculated rates are compared with the most recent measurements performed on the ion Test Storage Ring (TSR) in Heidelberg, Germany.
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Affiliation(s)
- D O Kashinski
- Department of Physics and Nuclear Engineering, United States Military Academy, West Point, New York 10996, USA
| | - D Talbi
- Laboratoire Univers et Particules de Montpellier, Université de Montpellier, CNRS, Place Eugène Bataillon, 34095 Montpellier, France
| | - A P Hickman
- Department of Physics, Lehigh University, 16 Memorial Drive East, Bethlehem, Pennsylvania 18015, USA
| | - O E Di Nallo
- Department of Physics and Nuclear Engineering, United States Military Academy, West Point, New York 10996, USA
| | - F Colboc
- Laboratoire Ondes et Milieux Complexes, UMR 6294, Université Le Havre, 25, Rue Philippe Lebon, BP 540, F-76058 Le Havre, France
| | - K Chakrabarti
- Department of Mathematics, Scottish Church College, 1 and 3 Urquhart Square, Calcutta 700 006, India
| | - I F Schneider
- Laboratoire Ondes et Milieux Complexes, UMR 6294, Université Le Havre, 25, Rue Philippe Lebon, BP 540, F-76058 Le Havre, France
| | - J Zs Mezei
- Laboratoire Ondes et Milieux Complexes, UMR 6294, Université Le Havre, 25, Rue Philippe Lebon, BP 540, F-76058 Le Havre, France
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Chakrabarti K. MO-B-209-01: Certificate Extension Process for DBT and the Medical Physicist's Role. Med Phys 2016. [DOI: 10.1118/1.4957188] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Motapon O, Niyonzima S, Chakrabarti K, Mezei J, Backodissa D, Ilie S, Epee ME, Peres B, Lanza M, Tchakoua T, Pop N, Argoubi F., Telmini M, Dulieu O, Bultel A, Robert J, Larson Å, Orel A, Schneider I. Advances in the MQDT approach of electron/molecular cation reactive collisions: High precision extensive calculations for applications. EPJ Web of Conferences 2015. [DOI: 10.1051/epjconf/20158402003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Vecchio S, Brunner C, Taylor M, Williams M, Kaczmarek R, Chakrabarti K. SU-C-116-04: Development of a Comprehensive QC Protocol for Digital Breast Tomosynthesis (DBT). Med Phys 2013. [DOI: 10.1118/1.4813986] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Dobbins J, Chakrabarti K. WE-E-217BCD-01: Digital Breast Tomosynthesis: Basic Principles and the QMP's Role. Med Phys 2012; 39:3954. [DOI: 10.1118/1.4736138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Raithatha AH, Smith S, Chakrabarti K, Tridente A, Kerr K. Cardiopulmonary exercise testing and elective open abdominal aortic aneurysm surgery over a 6-year period in a UK teaching hospital. Crit Care 2012. [PMCID: PMC3363885 DOI: 10.1186/cc11074] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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de las Heras H, Minniti R, Wilson S, Benevides L, Skopec M, Chakrabarti K. SU-E-I-46: Methods to Determine Peak Skin Dose and Organ Doses for Computed Tomography Examinations. Med Phys 2011. [DOI: 10.1118/1.3611619] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Basu S, Saha M, Chattopadhyay D, Chakrabarti K. Degumming and characterization of ramie fibre using pectate lyase from immobilizedBacillus pumilusDKS1. Lett Appl Microbiol 2009; 48:593-7. [DOI: 10.1111/j.1472-765x.2009.02584.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Bishnu A, Saha T, Mazumdar D, Chakrabarti K, Chakraborty A. Assessment of the impact of pesticide residues on microbiological and biochemical parameters of tea garden soils in India. J Environ Sci Health B 2008; 43:723-731. [PMID: 18941998 DOI: 10.1080/03601230802388850] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The main aim of this study was to assess the impact of pesticidal residues on soil microbial and biochemical parameters of the tea garden soils. The microbial biomass carbon (MBC), basal (BSR) and substrate induced respirations (SIR), beta-glucosidase activity and fluorescein diacetate hydrolyzing activity (FDHA) of six tea garden soils, along with two adjacent forest soils (control) in West Bengal, India were measured. The biomass and its activities and biochemical parameters were generally lower in the tea garden soils than the control soils. The MBC of the soils ranged from 295.5 to 767.5 micro g g(- 1). The BSR and SIR ranged from 1.65 to 3.08 mu g CO2-C g(- 1) soil h(- 1) and 3.08 to 10.76 micro g CO2-C g(- 1)h(- 1) respectively. The beta-glucosidase and FDHA of the soils varied from 33.3 and 76.3 micro g para-nitrophenol g(- 1) soil h(- 1) and 60.5 to 173.5 micro g fluorescein g(- 1)h(- 1)respectively. The tea garden soils contained variable residues of organophosphorus and organochlorine pesticides, which negatively affected the MBC, BSR, SIR, FDHA and beta -glucosidase activity. Ethion and chlorpyriphos pesticide residues in all the tea garden soils varied from 5.00 to 527.8 ppb and 17.6 to 478.1 ppb respectively. The alpha endosulfan, beta endosulfan and endosulfan sulfate pesticide residues in the tea garden soils ranged from 7.40 to 81.40 ppb, 8.50 to 256.1 ppb and 55 to 95.9 ppb respectively. Canonical correlation analysis shows that 93% of the total variation was associated with the negative impact of chlorpyriphos, beta and alpha endosulfan and endosulfan sulfate on MBC, BSR and FDHA. At the same time ethion had negative impact on SIR and beta-glucosidase. Data demonstrated that the pesticide residues had a strong impact on the microbial and biochemical components of soil quality.
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Affiliation(s)
- A Bishnu
- Institute of Environmental Studies and Wetland Management, Salt Lake City, Calcutta, India.
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Bhattacharyya P, Chakrabarti K, Chakraborty A, Tripathy S, Kim K, Powell MA. Cobalt and nickel uptake by rice and accumulation in soil amended with municipal solid waste compost. Ecotoxicol Environ Saf 2008; 69:506-12. [PMID: 17537511 DOI: 10.1016/j.ecoenv.2007.03.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2006] [Revised: 03/11/2007] [Accepted: 03/24/2007] [Indexed: 05/15/2023]
Abstract
Effect of addition of municipal solid waste compost (MSWC) on cobalt (Co) and nickel (Ni) contents of submerged rice paddies were studied. A sequential extraction method was used to determine the metal (Co and Ni) fractions in MSWC and cow dung manure (CDM). Both metals were significantly bound to the organic matter and Fe and Mn oxides in MSWC and CDM. Metal content in rice straw was higher than in rice grain. Metal bound with Fe and Mn oxides in MSWC and CDM best correlated with straw and grain metal followed by water soluble and exchangeable fractions. Carbonate, organic matter bound and residual fractions in MSWC and CDM did not significantly correlate with rice straw and grain metal. MSWC would be a valuable resource for agriculture, but long-term field experiments with MSWC are needed to assess by regular monitoring of the metal loads and accumulation in soil and plants.
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Affiliation(s)
- P Bhattacharyya
- BK21 Advanced Geo-Environment Research Team, School of Environmental Engineering, Kunsan National University, Kunsan, Jeonbuk, 573-701, Republic of Korea.
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Bhattacharyya P, Mitra A, Chakrabarti K, Chattopadhyay DJ, Chakraborty A, Kim K. Effect of heavy metals on microbial biomass and activities in century old landfill soil. Environ Monit Assess 2008; 136:299-306. [PMID: 17370129 DOI: 10.1007/s10661-007-9685-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2006] [Accepted: 02/28/2007] [Indexed: 05/14/2023]
Abstract
A study was conducted to determine the effect of metals on soil microbial biomass and activities in landfill soils as well as normal background soil. The microbial biomass and activities were consistently higher in the landfill soils than in the background soil. Significant positive correlations existed between the microbial parameters and soil organic carbon. The landfill soils contained higher concentrations of metals (iron, manganese, copper, cadmium, lead and zinc) than did the background soil. Microbial parameters were negatively correlated with the metals, with inhibition increasing with the bioavailability of the metals. It is suggested that the metals affected microbial biomass and activities by behaving synergistically or additively with each other. Although the landfill soils had higher microbial biomass and activities than the background soil, due to higher organic matter content, the ratios of microbial parameters/organic carbon indicated that inhibition of microbial growth and activities had occurred due to metal stress.
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Affiliation(s)
- P Bhattacharyya
- BK21 Advanced Geo-Environment Research Team, School of Environmental Engineering, Kunsan National University, Jeonbuk, Kunsan 573-701, South Korea.
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Bhattacharyya P, Chakrabarti K, Tripathy S, Chakraborty A, Kim K, Kim SH. L-asparaginase and L-glutaminase activities in submerged rice soil amended with municipal solid waste compost and decomposed cow manure. J Environ Sci Health B 2007; 42:593-8. [PMID: 17562468 DOI: 10.1080/03601230701389462] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
The field study was conducted to evaluate the effect of municipal solid waste compost (MSWC) as a soil amendment on L-asparaginase (LA) and L-glutaminase (LG) activities. Experiments were conducted during the wet seasons of 1997, 1998 and 1999 on rice grown under a submerged condition, at the Agriculture Experimental Farm, Calcutta University at Baruipur, West Bengal, India. The treatments consisted of control, no input; MSWC, at 60 Kg N ha(- 1); well-decomposed cow manure (DCM), at 60 Kg N ha(- 1); MSWC (30 Kg N ha(- 1)) + Urea (U) (30 Kg N ha(- 1)); DCM (30 Kg N ha(- 1)) + U (30 Kg N ha(- 1)) and Fertilizer, (at 60:30:30 NPK kg ha(- 1)) through urea, single superphosphate and muriate of potash respectively). LA and LG activities alone and their ratio with organic-C (ratio index value, RIV), straw and grain yield were higher in DCM than MSWC-treated soils, due to higher amount of biogenic organic materials like water-soluble organic carbon, carbohydrate and mineralizable nitrogen in the former. The studied parameters were higher when urea was integrated with DCM or MSWC, compared to their single applications. The heavy metals in MSWC did not detrimentally influence the above-measured activities of soil. In the event of long term MSWC application, changes in soil quality parameters should be monitored regularly, since heavy metals once entering into soil persist over a long period.
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Affiliation(s)
- P Bhattacharyya
- BK21 Advanced Geo-Environment Research Team, Kunsan National University, Kunsan, Jeonbuk, South Korea.
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Nemmers S, Mitchell C, Thomas J, Chakrabarti K, Kaczmarek R, Romanyhukha A. SU-FF-I-41: Effect of Room Setting On Object Dectectability for Two Different AMLCD Displays. Med Phys 2007. [DOI: 10.1118/1.2760418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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15
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Bhattacharyya P, Chakrabarti K, Chakraborty A, Nayak DC, Tripathy S, Powell MA. Municipal waste compost as an alternative to cattle manure for supplying potassium to lowland rice. Chemosphere 2007; 66:1789-93. [PMID: 16956645 DOI: 10.1016/j.chemosphere.2006.07.062] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2006] [Revised: 07/21/2006] [Accepted: 07/23/2006] [Indexed: 05/11/2023]
Abstract
The importance of the use of potassium in agriculture is increasing in South Asia for making most productive use of the nutrient in terms of economic returns. Nutrient supply traditionally by cattle manure is constrained by its insufficient availability. Municipal waste compost may be an alternative source of nutrient supplements. Field experiments were conducted at the Experimental Farm of Calcutta University, West Bengal, India during the wet seasons of 1997, 1998 and 1999 on flooded lowland rice. Potassium fractions in municipal waste compost and cattle manure were determined by sequential extraction and also the potassium uptake by rice to compare the effectiveness of municipal waste compost with traditional manure. Potassium was significantly bound to the organic matter in municipal waste compost. Potassium uptake by rice grain and straw increased significantly with the combined application of organics and fertilizers and it was higher in grain than in straw. Water-soluble and non-exchangeable potassium contents of municipal waste compost and cattle manure were highly correlated with the uptake of potassium by straw and grain. Exchangeable and residual potassium were also significantly correlated with the uptake of potassium by straw and grain of rice. Much higher uptake of K in rice straw and rain resulted from applying the manures in conjunction with fertilizers than when applied singly.
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Affiliation(s)
- P Bhattacharyya
- West Bengal State Council of Science & Technology, Bikash Bhawan, North Block, 4th Floor, Salt Lake City, Kolkata 700091, West Bengal, India.
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Thomas J, Chakrabarti K, Kaczmarek R, Mitchell C, Romanyukha A, Nemmers S, Loscocc M. SU-FF-I-73: Comparison of the Effects of Viewing Conditions and Viewing Angle On Object Dectectability for Different AMLCD Displays. Med Phys 2006. [DOI: 10.1118/1.2240753] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Thomas JA, Chakrabarti K, Kaczmarek RV, Maslennikov A, Mitchell CA, Romanyukha A. Optimization of reading conditions for flat panel displays. J Digit Imaging 2006; 19:181-7. [PMID: 16437286 PMCID: PMC3045187 DOI: 10.1007/s10278-006-9710-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
Abstract
Task Group 18 (TG 18) of the American Association of Physicists in Medicine has developed guidelines for Assessment of Display Performance for Medical Imaging Systems. In this document, a method for determination of the maximum room lighting for displays is suggested. It is based on luminance measurements of a black target displayed on each display device at different room illuminance levels. Linear extrapolation of the above luminance measurements vs. room illuminance allows one to determine diffuse and specular reflection coefficients. TG 18 guidelines have established recommended maximum room lighting. It is based on the characterization of the display by its minimum and maximum luminance and the description of room by diffuse and specular coefficients. We carried out these luminance measurements for three selected displays to determine their optimum viewing conditions: one cathode ray tube and two flat panels. We found some problems with the application of the TG 18 guidelines to optimize viewing conditions for IBM T221 flat panels. Introduction of the requirement for minimum room illuminance allows a more accurate determination of the optimal viewing conditions (maximum and minimum room illuminance) for IBM flat panels. It also addresses the possible loss of contrast in medical images on flat panel displays because of the effect of nonlinearity in the dependence of luminance on room illuminance at low room lighting.
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Affiliation(s)
- J. A. Thomas
- Uniformed Services University of the Health Sciences, Bethesda, MD 20814 USA
| | - K. Chakrabarti
- Center for Devices and Radiological Health, FDA, Rockville, MD 20850 USA
| | - R. V. Kaczmarek
- Center for Devices and Radiological Health, FDA, Rockville, MD 20850 USA
| | - A. Maslennikov
- Uniformed Services University of the Health Sciences, Bethesda, MD 20814 USA
| | - C. A. Mitchell
- Uniformed Services University of the Health Sciences, Bethesda, MD 20814 USA
| | - A. Romanyukha
- Uniformed Services University of the Health Sciences, Bethesda, MD 20814 USA
- 4301 Jones Bridge Road, Bethesda, MD 20814 USA
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Abstract
A laboratory study was conducted to monitor the effect of pencycuron [1-(4-chlorobenzyl)-1-cyclopentyl-3-phenylurea] on microbial parameters of alluvial (AL) soil (Typic udifluvent) and coastal saline (CS) soil (Typic endoaquept) under waterlogged condition. Pencycuron at field rate (FR), 2FR and 10FR affected the microbial biomass C (MBC), soil ergosterol content and fluorescein diacetate hydrolyzing activity (FDHA) differentially. The DCM amendment did not seem to have any counteractive effect on the toxicity of pencycuron on the microbial variables. The change in microbial metabolic quotient (qCO2) and microbial respiration quotient (QR), indicated pencycuron induced disturbance at 10FR. Present study revealed that the metabolically activated microbial population was more suppressed compared to the dormant population.
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Affiliation(s)
- R Pal
- Department of Agricultural Chemistry and Soil Science, Calcutta University, Calcutta, India.
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Pal R, Das P, Chakrabarti K, Chakraborty A, Chowdhury A. Butachlor degradation in tropical soils: effect of application rate, biotic-abiotic interactions and soil conditions. J Environ Sci Health B 2006; 41:1103-13. [PMID: 16923594 DOI: 10.1080/03601230600851141] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
The degradative characteristics of butachlor (N-Butoxymethyl-2-chloro-2',6'-diethyla- cetanilide) were studied under controlled laboratory conditions in clay loam alluvial (AL) soil (Typic udifluvent) and coastal saline (CS) soil (Typic endoaquept) from rice cultivated fields. The application rates included field rate (FR), 2-times FR (2FR) and 10-times FR (10FR). The incubation study was carried out at 30 degrees C with and without decomposed cow manure (DCM) at 60% of maximum water holding capacity (WHC) and waterlogged soil condition. The half-life values depended on the soil types and initial concentrations of butachlor. Butachlor degraded faster in AL soil and in soil amended with DCM under waterlogged condition. Microbial degradation is the major avenue of butachlor degradation from soils.
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Affiliation(s)
- R Pal
- Department of Agricultural Chemistry & Soil Science, Calcutta University, Calcutta, India.
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Pal R, Bhattacharyya P, Chakrabarti K, Chakraborty A. Fate of pesticides in Calcutta's municipal solid waste: effect of composting. Ambio 2005; 34:647-8. [PMID: 16521843 DOI: 10.1639/0044-7447(2005)034[0647:fopicm]2.0.co;2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Affiliation(s)
- R Pal
- Department of Agricultural Chemistry & Soil Science, Calcutta University, Kolkata, India
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Pal R, Chakrabarti K, Chakraborty A, Chowdhury A. Pencycuron application to soils: degradation and effect on microbiological parameters. Chemosphere 2005; 60:1513-22. [PMID: 16083758 DOI: 10.1016/j.chemosphere.2005.02.068] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2004] [Revised: 02/15/2005] [Accepted: 02/21/2005] [Indexed: 05/03/2023]
Abstract
Clay loam soil from agricultural fields of alluvial (AL) soil (typic udifluvent) and coastal saline (CS) soil (typic endoaquept) were investigated for the degradation and effect of pencycuron application at field rate (FR), 2-times FR (2FR) and 10-times FR (10FR) with and without decomposed cow manure (DCM) on soil microbial variables under laboratory conditions. Pencycuron degraded faster in CS soil and in soil amended with DCM. Pencycuron spiking at FR and 2FR resulted in a short-lived (in case of 10FR slightly longer) and transitory toxic effect on soil microbial biomass-C (MBC), ergosterol content and fluorescein diacetate hydrolyzing activity (FDHA). Amendment of DCM did not seem to have any counteractive effect of the toxicity of pencycuron on the microbial variables. The ecophysiological status of the soil microbial communities as expressed by microbial metabolic quotient (qCO2) and microbial respiration quotient (Q(R)) changed, but for a short period, indicating pencycuron induced disturbance. The duration of this disturbance was slightly longer at 10FR. Pencycuron was more toxic to the metabolically activated soil microbial populations, specifically the fungi. It is concluded that side effects of pencycuron at 10FR on the microbial variables studied were only short-lived and probably of little ecological significance.
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Affiliation(s)
- R Pal
- Department of Agricultural Chemistry and Soil Science, Calcutta University, Calcutta 700 019, India.
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Bhattacharyya P, Chakraborty A, Chakrabarti K, Tripathy S, Powell MA. Chromium uptake by rice and accumulation in soil amended with municipal solid waste compost. Chemosphere 2005; 60:1481-6. [PMID: 16054917 DOI: 10.1016/j.chemosphere.2005.02.024] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2004] [Revised: 01/25/2005] [Accepted: 02/10/2005] [Indexed: 05/03/2023]
Abstract
Effect of addition of municipal solid waste compost (MSWC) on chromium (Cr) content of submerged rice paddies was studied. Experiments were conducted during the three consecutive wet seasons from 1997 to 1999 on rice grown under submergence, at the Experimental Farm of Calcutta University, India. A sequential extraction method was used to determine the various chromium fractions in MSWC and cow dung manure (CDM). Chromium was significantly bound to the organic matter and Fe and Mn oxides in MSWC and CDM. Chromium content in rice straw was higher than in rice grain. Chromium bound with organic matter in MSWC best correlated with straw Cr (r=0.99**) followed by Fe and Mn oxides (r=0.97*) and water soluble as well as exchangeable fractions (r=0.96*). The water soluble and the exchangeable fractions in MSWC best correlated with grain Cr (r=0.98*). The Cr content of rice grain had the highest correlation with water soluble and exchangeable Cr (r=0.99**) while the straw Cr best correlated with the Fe and Mn oxides (r=0.98*). Both the carbonate bound and residual fractions in MSWC and CDM did not significantly correlate with rice straw and grain Cr. MSWC would be a valuable resource for agriculture if it can be used safely, but long-term use may require the cessation of the dumping by the leather tanneries and other major contributors of pollutants.
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Affiliation(s)
- P Bhattacharyya
- Department of Geology & Geophysics, Indian Institute of Technology, Kharagpur 721302, West Bengal, India.
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Pal R, Chakrabarti K, Chakraborty A, Chowdhury A. Dissipation of pencycuron in rice plant. J Zhejiang Univ Sci B 2005; 6:756-8. [PMID: 16052708 PMCID: PMC1389856 DOI: 10.1631/jzus.2005.b0756] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Pencycuron is a non-systemic protective fungicide for controlling sheath blight of rice. However, information on the fate of pencycuron in rice plant is lacking. The degradation of pencycuron in waterlogged tropic rice field was investigated. Pencycuron was applied at recommended field dose (187.5 g a.i./ha) and double recommended dose to cropped plots for three consecutive years. Pencycuron was rapidly degraded in rice plant at all doses of pencycuron application with first order half-lives of 1.57 approximately 2.77 d. The study revealed that pencycuron is safe from the human and environmental contamination point of view.
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Affiliation(s)
- R Pal
- Department of Agricultural Chemistry and Soil Science, Calcutta University, Calcutta, Pin 700 019, India.
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Bhattacharyya P, Chakrabarti K, Chakraborty A. Microbial biomass and enzyme activities in submerged rice soil amended with municipal solid waste compost and decomposed cow manure. Chemosphere 2005; 60:310-8. [PMID: 15924949 DOI: 10.1016/j.chemosphere.2004.11.097] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2004] [Revised: 11/25/2004] [Accepted: 11/29/2004] [Indexed: 05/02/2023]
Abstract
We studied the suitability of municipal solid waste compost (MSWC) application to submerged rice paddies in the perspective of metal pollution hazards associated with such materials. Experiments were conducted during the wet seasons of 1997, 1998 and 1999 on rice grown under submerged condition, at the Agriculture Experimental Farm, Calcutta University at Baruipur, West Bengal, India. The treatments consisted of control, no input; MSWC, at 60 kgNha(-1); well decomposed cow manure (DCM), at 60 kgNha(-1); MSWC (30 kgNha(-1)) +Urea (30 kgNha(-1)); DCM (30 kgNha(-1)) +U (30 kgNha(-1)) and Fertilizer, (at 60:30:30 NPK kgha(-1) through urea, single superphosphate and muriate of potash respectively). Soil microbial biomass-C (MBC), MBC as percentage of organic-C (ratio index value, RIV), urease and acid phosphatase activities were higher in DCM than MSWC-treated soils, due to higher amount of biogenic organic materials like water soluble organic carbon, carbohydrate and mineralizable nitrogen in the former. The studied parameters were higher when urea was integrated with DCM or MSWC, compared to their single applications. Soil MBC, urease and acid phosphatase activities periodically declined up to 60 day after transplanting (DAT) and then increased after crop harvest. The heavy metals in MSWC did not detrimentally influence MBC, urease and acid phosphatase activities of soil. In the event of long term MSWC application, changes in soil quality parameters should be monitored regularly, since heavy metals once entering into soil persist over a long period.
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Affiliation(s)
- P Bhattacharyya
- Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur 721 302, West Bengal, India.
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Thomas J, Romanyukha A, Chakrabarti K, Kaczmarek R. TU-FF-A3-04: Impact of Room Illuminance On Black Level Luminance and Contrast Detection for Off-Axis Viewing On High Resolution Normal and High-Bright Flat Panel Displays. Med Phys 2005. [DOI: 10.1118/1.1998457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Abstract
In this article we demonstrate the effect of room illuminance and surrounding monitor black level luminance on image quality for soft copy interpretation. Luminance values of a 10% central target and image quality evaluations and observer performance using a contrast-detail mammography (CDMAM) phantom demonstrate these effects. Our results indicate that high room illuminance has a more damaging effect on image quality when the surrounding monitor luminance is 0% to 5% of the maximum monitor luminance. The effect of room illuminance is less obvious when the surrounding monitor luminance is 20% of the maximum.
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Affiliation(s)
- K Chakrabarti
- Radiological Devices Branch, HFZ-470, Food and Drug Administration/DRARD/ODE/CDRH, 9200 Corporate Boulevard, Rockville, MD 20850, USA.
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Abstract
Modification of the dosing schedule for doxorubicin (DOX) administration represents a possible method of reducing cardiotoxicity from this potent anti-cancer drug, while at the same time maintaining its cytotoxic action. The quantitative effects of modified dosage scheduling have been investigated in a clinically relevant rat model. Cardiotoxicity to DOX was assessed by the degree of reduction in cardiac output at 4-24 weeks after the intravenous administration of DOX. The effects of dose schedules involving three or six small dose administrations, over one and two weeks, were compared with that produced by large single doses of DOX. The total drug dose administered for each schedule was varied in order to establish dose-effect relationships. After a total dose of 3 mg/kg DOX, given as three or six equal small doses, there was a gradual decline in cardiac output in the first 12 weeks after drug administration. Between 12 and 24 weeks, the reduction in cardiac function was relatively stable at between 65% and 85% of that of age-matched controls for three and six equal small doses, respectively. Dose-effect curves for animals showing a > or = 30% reduction in cardiac function after 12 weeks indicated the degree of reduction in cardiac function produced by the modified dose scheduling. Compared with a large single dose, larger total doses were required to produce the same severity of damage. Thus, schedules based on three and six equal small doses resulted in dose modification factor of 1.5 +/- 0.23 and 2.1 +/- 0.28, respectively, when compared with the same effect produced by a large single dose. This appeared to be independent of the severity of cardiac damage, suggesting a simple mathematical relationship between the total acceptable dose of DOX and the dose administered at each intravenous injection. These modifications in the cardiotoxicity of DOX produced by the administration of multiple small doses were of the same order of magnitude as that produced by other methods introduced to reduce anthracycline cardiotoxicity.
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Affiliation(s)
- T K Yeung
- Normal Tissue Radiobiology Group, Research Institute, University of Oxford, Churchill Hospital, Oxford OX3 7LJ, UK
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Hopewel JW, Duncan R, Wilding D, Chakrabarti K. Preclinical evaluation of the cardiotoxicity of PK2: a novel HPMA copolymer-doxorubicin-galactosamine conjugate antitumour agent. Hum Exp Toxicol 2001; 20:461-70. [PMID: 11776408 DOI: 10.1191/096032701682693017] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
PK2 is a polymeric anticancer conjugate composed of an N-(2-hydroxypropyl)methacrylamide (HPMA) copolymer backbone and pendant doxorubicin (DOX) linked via a Gly-Phe-Leu-Gly peptide spacer. Additionally galactose residues are present to facilitate liver targeting. To justify clinical evaluation of PK2 it was necessary to determine its late cardiotoxicity compared to that of free DOX. A well standardised Sprague-Dawley rat model was used with either intravenous (i.v.) administration (4, 8 and 12 mg/kg DOX equivalent) or intraperitoneal (i.p.) administration (12, 18, 24 and 36 mg/kg DOX equivalent) of PK2. This variation in the route was due to the limited solubility of PK2 at higher doses. PK2 showed two to three times less acute toxicity (assessed by the maximum reduction in body weight in the first 2 weeks) than free DOX, and both compounds were less toxic when given i.p.. No animals given PK2 i.v. showed clinical signs of cardiotoxicity, the only toxicity seen was abnormal tooth growth (approximately 50% of the animals receiving 12 mg/kg, DOX equivalent). In contrast, several animals receiving free DOX (1-4 mg/kg) i.v. died due to cardiotoxicity in an approximately dose-related manner. All animals receiving free DOX (4 mg/kg) died by 12 weeks. Following i.p. administration of PKZ there were only two late deaths related to cardiotoxicity and these were in the 24 mg/kg DOX equivalent group. All animals receiving PK2 at the highest dose (36 mg/kg DOX equivalent) died within 4 weeks, cardiotoxicity was not the main contributing factor. In this study, PK2 displayed a approximately 5-fold reduction in cardiotoxicity relative to free DOX and this supported the progression of PK2 into early clinical investigation.
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Affiliation(s)
- J W Hopewel
- Normal Tissue Radiobiology Group, Research Institute (University of Oxford), The Churchill Hospital, UK
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Chakrabarti K, Thomas JA, Kaczmarek RV, Waynant RW, Loscocco MF. Optimization of viewing conditions and phantom image quality evaluations on GE DMR and full-field digital mammography system. J Digit Imaging 2000; 13:226-7. [PMID: 10847411 PMCID: PMC3453241 DOI: 10.1007/bf03167673] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Affiliation(s)
- K Chakrabarti
- CDRH/Food and Drug Administration, Rockville, MD 20850, USA
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Sengupta A, Adhikary P, Basak BK, Chakrabarti K, Gangopadhyay P, Banerji J, Chatterjee A. Pre-clinical toxicity evaluation of leaf-stalk extractive of Piper betle Linn. in rodents. Indian J Exp Biol 2000; 38:338-42. [PMID: 11218809] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
Studies on pre-clinical toxicity were undertaken to determine the haematological and biochemical changes after administration of alcoholic extract of leaf-stalk of P. betle in rats and mice. Acute and chronic toxicity experiments were performed on mice and rats according to WHO protocol. Different doses of plant extractive were administered for toxicity studies on short and long term basis. Haematological, biochemical profiles and enzymatic studies (transaminases and phosphatases) indicated that the drug (plant extractive) was devoid of toxicity.
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Affiliation(s)
- A Sengupta
- Department of Chemistry and Centre of Advanced Studies on Natural Products, University College of Science and Technology, Calcutta University, 92, A.P.C. Road, Calcutta 700 009, India
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Abstract
The viewbox luminance and viewing room light level are important parameters in a medical film display, but these parameters have not had much attention. Spatial variations and too much room illumination can mask real signal or create the false perception of a signal. This presentation looks at how scotopic light sources and dark-adapted radiologists may identify more real diseases.
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Affiliation(s)
- R W Waynant
- Food and Drug Administration, Center for Devices and Radiological Health, Rockville, MD 20857, USA
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Waynant RW, Chakrabarti K, Kaczmerak R, Suleiman O, Rowberg A. Improved sensitivity and specificity of mammograms by producing uniform luminance from viewboxes. J Digit Imaging 1998; 11:189-91. [PMID: 9735466 PMCID: PMC3453348 DOI: 10.1007/bf03168301] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
Affiliation(s)
- R W Waynant
- Food and Drug Administration, Center for Devices and Radiological Health, Rockville, MD 20857, USA
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Abstract
We report here the results of our x-ray fluorescence, photostimulated luminescence, and time resolved laser spectroscopy studies in KCI:Cu. This material seems to possess some desirable properties for being used as an imaging plate in computed radiography. This is a US government work. There are no restrictions on its use.
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Affiliation(s)
- K Chakrabarti
- Division of Mammography Quality and Radiation Programs, Food and Drug Administration, Rockville, MD, USA
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Chakrabarti K, Showalter CK, Fischer RA. Digital mammography and the Mammography Quality Standards Act. J Digit Imaging 1997; 10:140-1. [PMID: 9268860 PMCID: PMC3452821 DOI: 10.1007/bf03168678] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Affiliation(s)
- K Chakrabarti
- Division of Mammography and Quality and Radiation Programs, Center For Devices and Radiological Health, Food and Drug Administration, Rockville, MD 20850, USA
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Chakrabarti K, Sharma J, Mathur VK, Barkyoumb JH. Optical properties of radiation defect centers involving single and paired Mn2+ centers in CaF2:Mn. Phys Rev B Condens Matter 1995; 51:16541-16548. [PMID: 9978655 DOI: 10.1103/physrevb.51.16541] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Polle A, Chakrabarti K. Effects of manganese deficiency on soluble apoplastic peroxidase activities and lignin content in needles of Norway spruce (Picea abies). Tree Physiol 1994; 14:1191-1200. [PMID: 14967628 DOI: 10.1093/treephys/14.10.1191] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Apoplastic peroxidase activities were investigated in manganese-deficient and manganese-sufficient needles of field-grown Norway spruce trees (Picea abies L.). In Mn-sufficient needles, two sets of peroxidases, one with an alkaline pI >/= 9 and another with an acidic pI </= 3, were identified using guaiacol or coniferylalcohol as substrates for activity staining after isoelectric focusing in a pH gradient from 3 to 9. The acidic peroxidases were capable of Mn-dependent NADH oxidation and H(2)O(2) formation. Syringaldazine peroxidase activity was not found in apoplastic extracts, but was present in whole-needle extracts. Manganese deficiency did not affect the activity or the isoelectric focusing pattern (pH 3 to 9) of the apoplastic peroxidases. Soluble peroxidase activities from whole-needle extracts were significantly higher in Mn-deficient than in Mn-sufficient needles with all substrates tested. Mn-deficient needles contained slightly less cell wall material than Mn-sufficient needles, but the lignin content was similar. Neither apoplastic peroxidase activity nor lignification was affected by Mn deficiency, suggesting that apoplastic peroxidases are regulated independently from symplastic peroxidases.
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Affiliation(s)
- A Polle
- Fraunhofer Institut für Atmosphärische Umweltforschung, Kreuzeckbahnstrasse 19, D-82467 Garmisch-Partenkirchen, Germany
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Chakrabarti K, Ghosh AK, Sengupta SK, Chakrabarti I, Ghosh J. Congenital erythropoietic porphyria. Indian Pediatr 1993; 30:1347-9. [PMID: 8039864] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- K Chakrabarti
- Department of Pediatrics, N.B. Medical College, Darjeeling
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Polle A, Chakrabarti K, Chakrabarti S, Seifert F, Schramel P, Rennenberg H. Antioxidants and Manganese Deficiency in Needles of Norway Spruce (Picea abies L.) Trees. Plant Physiol 1992; 99:1084-9. [PMID: 16668974 PMCID: PMC1080587 DOI: 10.1104/pp.99.3.1084] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Chlorotic and green needles from Norway spruce (Picea abies L.) trees were sampled in the Calcareous Bavarian Alps in winter. The needles were used for analysis of the mineral and pigment contents, the levels of antioxidants (ascorbate, glutathione), and the activities of protective enzymes (superoxide dismutase, catalase, ascorbate peroxidase, monodehydroascorbate radical reductase, dehydroascorbate reductase, glutathione reductase). In addition, the activities of two respiratory enzymes (glucose-6-phosphate dehydrogenase, NAD-malate dehydrogenase), which might provide the NADPH necessary for functioning of the antioxidative system, were determined. We found that chlorotic needles were severely manganese deficient (3 to 6 micrograms Mn per gram dry weight as compared with up to 190 micrograms Mn per gram dry weight in green needles) but had a similar dry weight to fresh weight ratio, had a similar protein content, and showed no evidence for enhanced lipid peroxidation as compared with green needles. In chlorotic needles, the level of total ascorbate and the activities of superoxide dismutase, monodehydroascorbate radical reductase, NAD-malate dehydrogenase, and glucose-6-phosphate dehydrogenase were significantly increased, whereas the levels of ascorbate peroxidase, dehydroascorbate reductase, glutathione reductase, and glutathione were not affected. The ratio of ascorbate to dehydroascorbate was similar in both green and chlorotic needles. These results suggest that in spruce needles monodehydroascorbate radical reductase is the key enzyme involved in maintaining ascorbate in its reduced state. The reductant necessary for this process may have been supplied at the expense of photosynthate.
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Affiliation(s)
- A Polle
- Fraunhofer Institut für Atmosphärische Umweltforschung, Kreuzeckbahnstr. 19, W-8100 Garmisch-Partenkirchen, Federal Republic of Germany
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Chakrabarti K, Sengupta SK, Ghosh AK, Das SK. Lipoid proteinosis (Urbach-Wiethe syndrome) with dwarfism. Indian Pediatr 1991; 28:75-8. [PMID: 2055618] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- K Chakrabarti
- Department of Pediatrics, North Bengal Medical College, Siliguri, Darjeeling
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Polle A, Chakrabarti K, Schürmann W, Renneberg H. Composition and Properties of Hydrogen Peroxide Decomposing Systems in Extracellular and Total Extracts from Needles of Norway Spruce (Picea abies L., Karst.). Plant Physiol 1990; 94:312-9. [PMID: 16667703 PMCID: PMC1077226 DOI: 10.1104/pp.94.1.312] [Citation(s) in RCA: 101] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Hydrogen peroxide (H(2)O(2)) scavenging systems of spruce (Picea abies) needles were investigated in both extracts obtained from the extracellular space and extracts of total needles. As assessed by the lack of activity of symplastic marker enzymes, the extracellular washing fluid was free from intracellular contaminations. In the extracellular washing fluid ascorbate, glutathione, cysteine, and high specific activities of guaiacol peroxidases were observed. Guaiacol peroxidases in the extracellular washing fluid and needle homogenates had the same catalytic properties, i.e. temperature optimum at 50 degrees C, pH optimum in the range of pH 5 to 6 and low affinity for guaiacol (apparent K(m) = 40 millimolar) and H(2)O(2) (apparent K(m) = 1-3 millimolar). Needle homogenates contained ascorbate peroxidase, dehydroascorbate reductase, monodehydroascorbate reductase, glutathione reductase, and catalase, but not glutathione peroxidase activity. None of these activities was detected in the extracellular washing fluid. Ascorbate and glutathione related enzymes were freeze sensitive; ascorbate peroxidase was labile in the absence of ascorbate. The significance of extracellular antioxidants for the detoxification of injurious oxygen species is discussed.
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Affiliation(s)
- A Polle
- Fraunhofer Institut für Atmosphärische Umweltforschung, Kreuzeckbahnstr. 19, D-8100 Garmisch-Partenkirchen, Federal Republic of Germany
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Chakrabarti K, Mathur VK, Abbundi RJ. Infrared-to-visible conversion following sub-band-gap excitation in MgS:Eu,Sm. Phys Rev B Condens Matter 1989; 39:10406-10408. [PMID: 9947835 DOI: 10.1103/physrevb.39.10406] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Chakrabarti K. Anterior fontanel size in hilly and non-hilly newborns in and around the district of Darjeeling. Indian Pediatr 1989; 26:41-4. [PMID: 2759693] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The sizes of the anterior fontanel were measured for 110 hilly and 130 non-hilly newborns in and around the District of Darjeeling to observe for any significant difference. The mean size of the anterior fontanel for the hilly newborns was 3.35 +/- 1.07 cm and for the non-hilly newborns was 3.80 +/- 1.95 cm. There was a significant difference (p less than 0.05) between the hilly and non-hilly races. Percentile grids for the mean anterior fontanel size were calculated. This study may help to prepare a national standard for the anterior fontanel size.
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Chakrabarti K, Mathur VK, Thomas LA, Abbundi RJ. Evidence of V- centers in trivalent rare-earth doped MgS. Phys Rev B Condens Matter 1988; 38:10894-10896. [PMID: 9945948 DOI: 10.1103/physrevb.38.10894] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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Chakrabarti K. Chylothorax. Indian Pediatr 1987; 24:606-7. [PMID: 3692596] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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Chakrabarti K, Sen A, Summers GP. Luminescence decay and electron traps in thermochemically reduced MgO. Phys Rev B Condens Matter 1985; 31:5428-5432. [PMID: 9936510 DOI: 10.1103/physrevb.31.5428] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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Chakrabarti K, Chatterjee SP, Basu M, Chakravarti RN. Turbidimetric assay of ampicillin using Staphylococcus aureus (ATCC 6538P). Indian J Exp Biol 1981; 19:674-5. [PMID: 7309153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Chakrabarti A, Chatterjee A, Chakrabarti K, Sengupta DN. Human scabies from contact with water buffaloes infested with Sarcoptes scabiei var. bubalis. Ann Trop Med Parasitol 1981; 75:353-7. [PMID: 7305505 DOI: 10.1080/00034983.1981.11687450] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Abstract
Of the different sources of nitrogen used for the yield of oxalic acid by parent and X-ray mutated strains of Sclerotium rolfsii, organic nitrogen sources gave better results than inorganic nitrogen sources. Cysteine is the best nitrogen source for the parent and one mutant strain while phenylalanine is for the second one.
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