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Torfs E, Dutta A, Nopens I. Investigating kernel structures for shear and Ca-induced activated sludge aggregation using a population balance model with an inverse problem methodology. COMMUNICATIONS IN AGRICULTURAL AND APPLIED BIOLOGICAL SCIENCES 2011; 76:29-32. [PMID: 21539190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
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102
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Jain RK, Datta S, Majumder S, Dutta A. Two IPMC Fingers Based Micro Gripper for Handling. INT J ADV ROBOT SYST 2011. [DOI: 10.5772/10523] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
This paper presents the behavior of two finger based micro gripper which is made of Ionic Polymer Metal Composite (IPMC), an Electro Active Polymer (EAP). An IPMC shows great potential as high-displacement and light weight actuator. Low mass force generation capability is utilized for micro gripping in micro assembly. IPMC responds to low voltage in the range of 0-3V. The material contains an electrolyte which transport ions in response to an external electric field. IPMC actuation for micro gripping is produced by deflecting material according to bending moment theory. An external electric field generated by suitable RC circuit causes this deflection. It is found that an IPMC actuates from 1–5 seconds. The maximum jaw opening and closing position of micro gripper are found to be 5 mm and 0.5 mm respectively. The effect of tempearture, as observed, shows that the acceptable limit varies from 23.1°C to 30.4°C while an IPMC is in operation. An experimental proto type is developed for evaluation of performance.
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Mahapatra S, Dutta A, Datta J. Temperature effect on the electrode kinetics of ethanol oxidation on Pd modified Pt electrodes and the estimation of intermediates formed in alkali medium. Electrochim Acta 2010. [DOI: 10.1016/j.electacta.2010.08.029] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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104
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Gupta ML, Gupta V, Shukla SK, Verma S, Sankhwar S, Dutta A, Suri KA. Inhibition in radiation mediated cellular toxicity by minimizing free radical flux: one of the possible mechanisms of biological protection against lethal ionizing radiation by a sub- fraction of Podophyllum hexandrum. Cell Mol Biol (Noisy-le-grand) 2010; 56 Suppl:OL1341-OL1349. [PMID: 20937221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2009] [Accepted: 06/15/2010] [Indexed: 05/30/2023]
Abstract
The study has focused on exploring the mechanism of action of Podophyllum hexandrum sub-fraction (G-001M) exhibiting >90% protection in lethally irradiated mice. Currently, G-001M was assessed for antioxidant characteristics by evaluating DPPH, superoxide and hydrogen peroxide radical formation, anti-lipid per oxidation, metal chelation and total flavonoid content. To affirm cytoprotective efficacy of G-001M, plasmid DNA protection, blood WBC counts, marker for lipid peroxidation (MDA) and antioxidant status (GSH) in mice splenocytes and thymocytes were studied. G-001M, having high amount of total phenolic contents (200±10mg, w/w), exhibited dose dependent inhibition in DPPH and superoxide radical formation. Hydrogen peroxide radical scavenging was higher than standards. With pre-treatment of G-001M, plasmid DNA was also maximally restored to supercoiled form. Radiation modulated MDA and GSH values in splenocytes and thymocytes of mice altered significantly after 24 hrs and at later intervals, values were close to the controls. Radiation mediated losses in WBC counts were significantly regained (p<0.001) in G-001M pre-treated irradiated mice. The above findings explicitly conveyed that G-001M has successfully minimized radiation inflicted free radicals generation and their multiplication. This activity of G-001M could be undoubtedly among one of the major modes of action in extending whole body survival in lethally irradiated mice.
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105
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Dutta A, Deshpande SB. Cardio-respiratory reflexes evoked by phenylbiguanide in rats involve vagal afferents which are not sensitive to capsaicin. Acta Physiol (Oxf) 2010; 200:87-95. [PMID: 20331538 DOI: 10.1111/j.1748-1716.2010.02105.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
AIM Stimulation of pulmonary C fibre receptors by phenylbiguanide (PBG, 5-HT(3) agonist) produces hypotension, bradycardia and tachypnoea or apnoea. However, tachypnoeic or apnoeic responses are not consistent. Therefore, this study was undertaken to delineate the actions of PBG on respiration and compared with those evoked by capsaicin (TRPV1 agonist). METHODS Blood pressure, respiratory excursions and ECG were recorded in urethane anaesthetized adult rats. The effect of PBG or capsaicin was evaluated before and after ondansetron (5-HT(3) antagonist), capsazepine (TRPV1 antagonist) or bilateral vagotomy. In addition, their effect on vagal afferent activity was also evaluated. RESULTS Bolus injection of PBG produced concentration-dependent (0.1-100 microg kg(-1)) hypotensive and bradycardiac responses, while there was tachypnoea at lower concentrations (0.1-3 microg kg(-1)) and apnoea at higher concentrations (10-100 microg kg(-1)). After vagotomy or after exposure to ondansetron both tachypnoeic and apnoeic responses were abolished along with cardiovascular responses. However, capsazepine (3 mg kg(-1)) did not block the PBG-induced reflex responses. Capsaicin (0.1-10 microg kg(-1)), on the other hand, produced a concentration-dependent apnoea, hypotension and bradycardia but tachypnoea was not observed. Ondansetron failed to block the capsaicin-induced reflex response while bilateral vagotomy abolished bradycardiac and hypotensive responses and attenuated the apnoeic response. In another series, vagal afferent activity and cardio-respiratory changes evoked by PBG were blocked by ondansetron. However, capsaicin failed to activate the PBG-sensitive vagal afferents even though cardio-respiratory alterations were observed. CONCLUSIONS The present observations indicate that PBG produced tachypnoea at a lower concentration and apnoea at a higher concentration involving vagal afferents which are different from those excited by capsaicin.
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Lu Z, So J, Dutta A, Nickoloff E. SU-GG-I-07: Monitoring Radiation Dose in Cerebral CT Perfusion Exams. Med Phys 2010. [DOI: 10.1118/1.3468040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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107
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Lu Z, So J, Dutta A, Nickoloff E. SU-GG-I-80: Overcoming the Angle Dependence of a Solid State Dosimeter in Direct Measurement of CT Dose. Med Phys 2010. [DOI: 10.1118/1.3468113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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108
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Leon MA, Dutta A. Fluidization characteristics of rice husk in a bubbling fluidized bed. CAN J CHEM ENG 2010. [DOI: 10.1002/cjce.20292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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109
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Bandyopadhyay SK, Moulick A, Chakrabarti N, Dutta A. Familial hypoparathyroidism. THE JOURNAL OF THE ASSOCIATION OF PHYSICIANS OF INDIA 2010; 58:115-117. [PMID: 20653155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
A family with hereditary (familial) hypoparathyroidism is reported where three of the total four siblings were affected and each presented with different manifestation-one brother with refractory epilepsy since early childhood, another brother with unilateral extrapyramidal features in adult life, and their only sister having recurrent attacks of tingling and numbness due to hypocalcemia since 12 years of age.
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110
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Leon MA, Dutta A. Fluidization characteristics of rice husk in a bubbling fluidized bed. CAN J CHEM ENG 2010. [DOI: 10.1002/cjce.20245] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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111
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Swami H, Dutta A, Nambiar S. Recurrent Bell's Palsy. Med J Armed Forces India 2010; 66:95-6. [PMID: 27365719 DOI: 10.1016/s0377-1237(10)80115-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2008] [Accepted: 08/12/2009] [Indexed: 10/18/2022] Open
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112
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Bandyopadhyay SK, Bandyopadhyay R, Dutta A. Profile of tuberculous meningitis with or without HIV infection and the predicators of adverse outcome. W INDIAN MED J 2009; 58:589-592. [PMID: 20583689] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
OBJECTIVES To compare the clinical, radiological and cerebrospinal fluid (CSF) findings, at hospital admission, among adult patients with tuberculous meningitis (TBM) with or without HIV infection and to identify the factors that predict adverse outcome at six months. METHODS A total of 82 adult patients with TBM were included (40 HIV-positive and 42 HIV-negative). Several clinical (duration of illness, Glasgow Coma Scale score, presence of high temperature, headache, cranial nerve or sphincter abnormality, seizures and endocrine dysfunction), radiological (presence of hydrocephalus, cerebral infarction and oedema, meningeal enhancement, granuloma) and cerebrospinal fluid parameters (glucose, protein, lactate, lymphocytes, neutrophils and adenosine deaminase values) were recorded along with CD4 count in the peripheral blood. Statistical analysis was performed using the chi-square test. Individual variables were evaluated as prognostic factors for adverse outcome in both groups by calculating the relative risk of association for each. RESULTS Temperature more than 38.33 degrees C was more common in the HIV-negative group while seizures, hydrocephalus, cerebral infarction and low CD4 count occurred significantly more commonly in the HIV-positive group. Hydrocephalus had strong association with severe neurological deficit and seizure with death in both the groups. CONCLUSION Several clinical and laboratory features of TBM in patients who are HIV-positive are distinctly different from those without HIV infection; some of these have an association with the probability of adverse outcome.
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113
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Dutta A, Nair V, Chandraharan E. P228 Decision to delivery interval for emergency caesarean sections: Goals vs reality. Int J Gynaecol Obstet 2009. [DOI: 10.1016/s0020-7292(09)61718-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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114
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Hazarika S, Dutta A, Dutta N. Pervaporation Aided Esterification of Carboxylic Acids with Ethanol Catalyzed by Porcine pancreatic Lipase. BIOCATAL BIOTRANSFOR 2009. [DOI: 10.1080/10242420310001597810] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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115
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116
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Pradhan A, Jairam A, Kumar R, Srivastava A, Srivastava A, Sreevastava D, Dutta A, Arora S, Bairaria A, Bhargava A. Posterior Reversible Encephalopathy Syndrome Posttransplantation: A Case Report of Possible Association With Cerebrospinal Fluid Leak After Epidural Catheterization. Transplant Proc 2009; 41:1957-60. [DOI: 10.1016/j.transproceed.2008.12.037] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2008] [Revised: 07/27/2008] [Accepted: 12/02/2008] [Indexed: 11/15/2022]
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117
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Dey S, Bhattacharyya S, Chakraborty R, Dutta A, Kharbuli S. Scanning electron microscopic studies on surface microstructural features of some tissues of epizootic ulcerative syndrome-affectedPuntius ticto(Hamilton, 1822) from Southern Assam of India. Microsc Res Tech 2009; 72:333-7. [DOI: 10.1002/jemt.20656] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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118
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James E, Dutta A, Swami H, Ramakrishnan R. Frontal Mucocele causing Unilateral Proptosis. Med J Armed Forces India 2009; 65:73-4. [PMID: 27408199 DOI: 10.1016/s0377-1237(09)80064-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2007] [Accepted: 08/18/2008] [Indexed: 11/15/2022] Open
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119
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Dutta A, Werner C. Stochastic resonance-enhanced laser-based particle detector. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2009; 2009:785-787. [PMID: 19963732 DOI: 10.1109/iembs.2009.5332748] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
This paper presents a Laser-based particle detector whose response was enhanced by modulating the Laser diode with a white-noise generator. A Laser sheet was generated to cast a shadow of the object on a 200 dots per inch, 512 x 1 pixels linear sensor array. The Laser diode was modulated with a white-noise generator to achieve stochastic resonance. The white-noise generator essentially amplified the wide-bandwidth (several hundred MHz) noise produced by a reverse-biased zener diode operating in junction-breakdown mode. The gain in the amplifier in the white-noise generator was set such that the Receiver Operating Characteristics plot provided the best discriminability. A monofiber 40 AWG (approximately 80 microm) wire was detected with approximately 88% True Positive rate and approximately 19% False Positive rate in presence of white-noise modulation and with approximately 71% True Positive rate and approximately 15% False Positive rate in absence of white-noise modulation.
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Dutta A, Bhattacharya M, Barat P, Mukherjee P, Gayathri N, Das GC. Lattice resistance to dislocation motion at the nanoscale. PHYSICAL REVIEW LETTERS 2008; 101:115506. [PMID: 18851298 DOI: 10.1103/physrevlett.101.115506] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2008] [Indexed: 05/26/2023]
Abstract
In this Letter, we propose a model that demonstrates the effect of a free surface on the lattice resistance experienced by a moving dislocation in nanodimensional systems. This effect manifests in an enhanced velocity of dislocation due to the proximity of the dislocation line to the surface. To verify this finding, molecular dynamics simulations for an edge dislocation in bcc molybdenum are performed, and the results are found to be in agreement with the numerical implementations of this model. The reduction in this effect at higher stresses and temperatures, as revealed by the simulations, confirms the role of lattice resistance behind the observed change in the dislocation velocity.
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Chakrabarti N, Moulick A, Saha J, Dutta A. Splenic metastasis and bleeding manifestations--an unusual association with gastric malignancy. THE JOURNAL OF THE ASSOCIATION OF PHYSICIANS OF INDIA 2008; 56:543-544. [PMID: 18846909] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Splenic metastasis is a rare clinical entity--incidence being 0.6% at autopsy and 1.1% at splenectomy. We report the case of a 30 year old female who presented with purpura and melena and who was later diagnosed to have a mucinous adenocarcinoma of stomach with disseminated intravascular coagulation and splenic metastasis.
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Gratuito MKB, Panyathanmaporn T, Chumnanklang RA, Sirinuntawittaya N, Dutta A. Production of activated carbon from coconut shell: optimization using response surface methodology. BIORESOURCE TECHNOLOGY 2008; 99:4887-4895. [PMID: 17993271 DOI: 10.1016/j.biortech.2007.09.042] [Citation(s) in RCA: 97] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2007] [Revised: 09/11/2007] [Accepted: 09/15/2007] [Indexed: 05/25/2023]
Abstract
The production of activated carbon from coconut shell treated with phosphoric acid (H3PO4) was optimized using the response surface methodology (RSM). Fifteen combinations of the three variables namely; impregnation ratio (1, 1.5, and 2); activation time (10, 20, and 30 min); and activation temperature (400, 450, and 500 degrees C) were optimized based on the responses evaluated (yield, bulk density, average pore diameter, small pore diameter, and number of pores in a unit area). Pore diameters were directly measured from scanning electron microscope (SEM) images. Individual second-order response surface models were developed and contour plots were generated for the optimization analysis. The optimum range identified for impregnation ratio was from 1.345 to 2, while for the activation time was from 14.9 to 23.9 min. For the activation temperature it was from 394 to 416 degrees C. The optimum points are 1.725, 19.5 min, and 416 degrees C, respectively. The models were able to predict well the values of the responses when the optimum variable parameters were validated as proven by the generally acceptable values of the residual percentages. Direct characterization of the pores using the SEM was found to be a good technique to actually see the pores and get actual measurements. Additionally, RSM has also proven to be a good tool in optimization analysis to get not only optimum production condition points but ranges, which are crucial for the flexibility of the production process, as well.
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Lu Z, So J, Nickoloff E, Dutta A. SU-GG-I-10: An Evaluation of a Solid State Dosimeter in Direct Measurement of CT Dose. Med Phys 2008. [DOI: 10.1118/1.2961409] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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124
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Kelley L, Axelrod S, Dutta A. SU-DD-A2-03: Measurement of Skin Dose When Using FlexiShield® with the Axxent® Electronic Brachytherapy System. Med Phys 2008. [DOI: 10.1118/1.2961358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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125
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Maiti SK, Dutta A, Ajith P, Kumar N, Sharma AK, Singh GR. Laparoscopy for Direct Examination of Internal Organs in Small Animals. JOURNAL OF APPLIED ANIMAL RESEARCH 2008. [DOI: 10.1080/09712119.2008.9706927] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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