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Sengupta SK, Pandey OP, Rai A, Sinha A. Synthesis, spectroscopic, thermal and antifungal studies on lanthanum(III) and praseodymium(III) derivatives of 1,1-diacetylferrocenyl hydrazones. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2006; 65:139-42. [PMID: 16877035 DOI: 10.1016/j.saa.2005.09.037] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2005] [Accepted: 09/15/2005] [Indexed: 05/11/2023]
Abstract
A series of new coordination complexes of La(III) and Pr(III) with hydrazones, derived from 1,1-diacetylferrocene and different aromatic acid hydrazides have been synthesized and characterized by elemental analyses, electrical conductance, magnetic moment, IR, (1)H NMR, UV-vis spectra and molar conductance. The thermal behaviour of the complexes under non-isothermal condition was investigated by TG and DTG techniques. The antifungal activity of hydrazones and their corresponding complexes were also investigated.
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Haji-Saeed B, Sengupta SK, Testorf M, Goodhue W, Khoury J, Woods CL, Kierstead J. Real-time holographic deconvolution techniques for one-way image transmission through an aberrating medium: characterization, modeling, and measurements. APPLIED OPTICS 2006; 45:3298-306. [PMID: 16676035 DOI: 10.1364/ao.45.003298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
We propose and demonstrate a new photorefractive real-time holographic deconvolution technique for adaptive one-way image transmission through aberrating media by means of four-wave mixing. In contrast with earlier methods, which typically required various codings of the exact phase or two-way image transmission for correcting phase distortion, our technique relies on one-way image transmission through the use of exact phase information. Our technique can simultaneously correct both amplitude and phase distortions. We include several forms of image degradation, various test cases, and experimental results. We characterize the performance as a function of the input beam ratios for four metrics: signal-to-noise ratio, normalized root-mean-square error, edge restoration, and peak-to-total energy ratio. In our characterization we use false-color graphic images to display the best beam-intensity ratio two-dimensional region(s) for each of these metrics. Test cases are simulated at the optimal values of the beam-intensity ratios. We demonstrate our results through both experiment and computer simulation.
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Haji-Saeed B, Kolluru R, Pyburn D, Leon R, Sengupta SK, Testorf M, Goodhue W, Khoury J, Drehman A, Woods CL, Kierstead J. Photoconductive optically driven deformable membrane under high-frequency bias: fabrication, characterization, and modeling. APPLIED OPTICS 2006; 45:3226-36. [PMID: 16676026 DOI: 10.1364/ao.45.003226] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
The fabrication and characterization of an optically addressable deformable mirror for a spatial light modulator are described. Device operation utilizes an electrostatically driven pixelated aluminized polymeric membrane mirror supported above an optically controlled photoconductive GaAs substrate. A 5 mum thick grid of patterned photoresist supports the 2 mum thick aluminized Mylar membrane. A conductive ZnO layer is placed on the backside of the GaAs wafer. Similar devices were also fabricated with InP. A standard Michelson interferometer is used to measure mirror deformation data as a function of illumination, applied voltage, and frequency. The device operates as an impedance distribution between two cascaded impedances of deformable membrane substrate, substrate, and electrode. An analysis of device's operation under several bias conditions, which relates membrane deformation to operating parameters, is presented.
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Khoury J, Drehman A, Woods CL, Haji-Saeed B, Sengupta SK, Goodhue W, Kierstead J. Optically driven microelectromechanical-system deformable mirror under high-frequency AC bias. OPTICS LETTERS 2006; 31:808-10. [PMID: 16544631 DOI: 10.1364/ol.31.000808] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
A new, optically addressed deformable mirror device is demonstrated. The device consists of a pixellated metalized polymeric membrane mirror supported above an optically addressed photoconductive substrate. A conductive transparent ZnO layer is deposited on the back side of the substrate. A very high-frequency AC bias is applied between the membrane and the back electrode of the device. The membrane is deformed when the back of the device is illuminated because of impedance and bias redistribution between two cascaded impedances. We fabricated, demonstrated, and modeled the operation of this device.
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Chandra R, Pandey OP, Sengupta SK. Organophosphorus derivatives containing piperazine dithiosemicarbazones as chemotherapeutants against fungal pathogens of sugarcane. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2005; 53:2181-2184. [PMID: 15769154 DOI: 10.1021/jf040134m] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Five novel organophosphorus derivatives have been synthesized by the reactions of O,O-diethylchlorophosphate with piperazine dithiosemicarbazones. The derivatives have been characterized on the basis of analyses and spectral (IR, 1H NMR) data. Fungicidal activities of these derivatives against Colletotrichum falcatum, Fusarium oxysporum, and Curvularia pallescence have been evaluated. The screening results have been correlated with the structural features of the tested compounds. Organophosphorus derivatives containing 1,4-bis(4-chlorobenzaldehyde)piperazine dithiosemicarbazone and 1,4-bis(4-methoxybenzaldehyde)piperazine dithiosemicarbazone proved to be more active than some prevalent commercial synthetic fungicides.
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Ramirez AL, Nitao JJ, Hanley WG, Aines R, Glaser RE, Sengupta SK, Dyer KM, Hickling TL, Daily WD. Stochastic inversion of electrical resistivity changes using a Markov Chain Monte Carlo approach. ACTA ACUST UNITED AC 2005. [DOI: 10.1029/2004jb003449] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Sengupta SK, Pandey OP, Rao GP, Dwivedi A, Singh P. Efficacy of Organophosphorus Derivatives Containing Substituted Chalcone Thiosemicarbazones and Dithiocarbazates Against Fungal Pathogens of Sugarcane. PHOSPHORUS SULFUR 2003. [DOI: 10.1080/10426500307813] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Sengupta SK, Justnes H, Gillies CW, Craig NC. Microwave spectra, electric dipole moment, and molecular structure of trans-1,2-difluorocyclopropane. J Am Chem Soc 2002. [DOI: 10.1021/ja00265a004] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Pandey OP, Sengupta SK, Baranwal BP, Shukla SK, Bhatt A. Mono-and Bis(cyclopentadienyl)hafnium(IV) Derivatives with Higher Fatty Acids. ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES 2001. [DOI: 10.1515/znb-2001-0205] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
The reactions of Cp2HfCl2 with some higher monocarboxylic acids having straight chains, caprylic (C8H16O2), lauric (C12H24O2), myristic (C14H28O2), palmitic (C16H32O2), stearic (C18H36O2), and behenic (C22H44O2) acid, have been studied in anhydrous tetrahydrofuran in 1:1 and 1:2 molar ratios, respectively. The reaction products isolated, of types Cp2Hf(L)Cl, CpHf(L)2Cl (LH represents different carboxylic acids), have been characterised by conductivity and magnetic susceptibility measurements and spectral (infrared, electronic, 1HNMR and 13C NMR) data. The bonding of the carboxylato ligand in these complexes has been discussed and plausible structures have been established.
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More JD, Sengupta SK, Manley PN. Promoting, building and sustaining a regional laboratory network in a changing environment. CLINICAL LEADERSHIP & MANAGEMENT REVIEW : THE JOURNAL OF CLMA 2000; 14:205-10. [PMID: 11793513] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
The Queen's University Department of Pathology and its affiliated hospital laboratories (Kingston, Canada) have operated a successful laboratory outreach program for more than a decade in Southeastern Ontario. The outreach program provides high quality reference testing and technical and professional expertise in laboratory medicine to largely rural and small urban community hospitals. As a consequence of dramatic cuts to the publicly funded health-care system in the Province of Ontario, the environment in which laboratory medicine is practiced has altered irrevocably. This article discusses some of the difficult internal and external challenges faced by the outreach program within the region and how they were effectively managed, not only to maintain but to enhance the program's services. The result has been a continued improvement in the quality of laboratory services in the region with significantly increased cost-effectiveness, largely through reengineering and consolidation.
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Dubey SP, Sengupta SK, Kaleh LK, Morewaya JT. Adult head and neck lymphomas in Papua New Guinea: a retrospective study of 70 cases. THE AUSTRALIAN AND NEW ZEALAND JOURNAL OF SURGERY 1999; 69:778-81. [PMID: 10553965 DOI: 10.1046/j.1440-1622.1999.01694.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
BACKGROUND During a 10-year period (1986-95), 70 adult Papua New Guineans with head and neck lymphomas were seen in the 18 years-and-above age group. METHODS The clinical information was obtained from the medical records section of the Port Moresby General Hospital. Relevant treatment modalities and the follow-up data were acquired from the National Cancer Centre, Angau Memorial Hospital, Lae. RESULTS Of a total of 227 adult lymphomas recorded in a 10-year period, 70 cases were seen in the head and neck region. Non-Hodgkin's lymphoma constituted 56 cases, which included seven cases of adult Burkitt's-like lymphoma. Fourteen cases of Hodgkin's lymphoma were recorded. CONCLUSIONS In Papua New Guinea, malignant lymphomas primarily affecting the head and neck region were seen in 30.8% of all lymphomas. This constitues 2.8% of all malignancies in this region. These lymphomas appear to be more aggressive at this site. Proper tissue diagnosis and combination chemoradiotherapy are the key factors in its management.
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Dubey S, Sengupta SK, Kaleh LK, Morewaya JT. Paediatric head and neck lymphomas in Papua New Guinea: a review and analysis of 67 cases. Int J Pediatr Otorhinolaryngol 1998; 43:235-40. [PMID: 9663945 DOI: 10.1016/s0165-5876(98)00012-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
A retrospective study of head and neck lymphomas in Papua Newguinean children between the age of 0 and 12 years for a 10-year period has been attempted. A total of 67 cases are recorded. This constitutes approximately 23% of all lymphomas seen during this period. There was a male predominance in all groups. Non-Hodgkin's lymphomas (NHL) comprised of 92% of which Burkitt's lymphomas (BL) predominate (64%). Almost 50% of these cases seen were in the age group of 5-8 years. In BL, cheek swelling and upper jaw involvement are the common modes of presentation, however, in 23% of cases advanced disease with multiple sites of involvement are noted. In other NHL cases, approximately 55% presented with cervical lymphadenopathy only, maxillary sinus was affected in four cases and orbit in two cases. Histological evaluation of NHL cases excluding BL revealed two high grade, nine intermediate grade and seven low grade tumours. Hodgkin's lymphoma (HL) comprised of 8%. All cases of HL presented with cervical lymphadenopathy. Standard therapeutic modalities for lymphomas with multidrug chemotherapy, surgery and radiotherapy were followed. Proper prognostic evaluation following the treatment had not been possible in view of poor patient compliance and lack of follow up.
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Sengupta SK, More JD, Manley PN. Integrating academic and community laboratory needs: developing a successful outreach program. CLINICAL LABORATORY MANAGEMENT REVIEW : OFFICIAL PUBLICATION OF THE CLINICAL LABORATORY MANAGEMENT ASSOCIATION 1997; 11:33-8. [PMID: 10165560] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
Abstract
Remarkably few large regional laboratory programs involving academic health centers exist in Canada. We present a model of a successful laboratory outreach program established by the Queen's University Department of Pathology (Kingston, Ontario) and its affiliated hospital laboratories. Community hospitals in small urban and semi-rural areas benefit from a diffusion of specialty expertise in laboratory medicine and technology, which enables them to increase their local testing capabilities and improve turn-around time. Testing and services of a more complex nature are referred to the academic hospitals. The result has been a steady improvement in the quality of laboratory services in the region with increased cost-effectiveness through shared services and focused economies of scale.
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Vele DD, Sengupta SK, Dubey SP, Dokup MK. Cystic lesions of the nasal cavity and the paranasal sinuses: report of two unusual cases. J Laryngol Otol 1996; 110:1157-60. [PMID: 9015432 DOI: 10.1017/s0022215100136011] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The clinicopathological features of two unusual cystic lesions, one arising in the nose, a calcified mucocele or a calcified retention cyst and the other in the maxillary sinus, a dentigerous cyst originating in a supernumerary tooth, are described. The literature on these two rare lesions is briefly reviewed.
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Sengupta SK, Sinha AK, White JC, Barua DL, Korinihona A. Intestinal infarction in systemic lupus erythematosus--report of a case with an unusual obliterative vascular lesion. PAPUA AND NEW GUINEA MEDICAL JOURNAL 1996; 39:43-7. [PMID: 9522850] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Intestinal infarction is a rare complication of systemic lupus erythematosus (SLE). A 26-year-old Papua New Guinean female who developed such a complication and underwent emergency laparotomy is described. The pathological changes in the mesenteric vessels and possible pathogenetic mechanisms are discussed. The relevant literature is briefly reviewed.
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Dubey SP, Sengupta SK, Vele DD. Nasopharyngeal osteosarcoma as second malignant neoplasm in a post-treated unilateral retinoblastoma: report of a case and review of literature. Int J Pediatr Otorhinolaryngol 1996; 34:265-71. [PMID: 8839078 DOI: 10.1016/0165-5876(95)01272-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
A rare case of osteosarcoma primarily originating in the nasopharynx of an 11-year-old Papua New Guinean female who received irradiation and multi-agent chemotherapy for unilateral non-hereditary retinoblasma is described. The relevant literature is briefly reviewed. The complex role of radiation, cytotoxic drugs and genes in the development of a second malignant neoplasm in association with retinoblasma is also discussed.
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Jacob OJ, Murthy DP, Sengupta SK. Primary malignant melanomas of the oral cavity in Papua New Guinea. THE AUSTRALIAN AND NEW ZEALAND JOURNAL OF SURGERY 1995; 65:585-7. [PMID: 7661801 DOI: 10.1111/j.1445-2197.1995.tb01701.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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Aitken C, Sengupta SK, Aedes C, Moss DJ, Sculley TB. Heterogeneity within the Epstein-Barr virus nuclear antigen 2 gene in different strains of Epstein-Barr virus. J Gen Virol 1994; 75 ( Pt 1):95-100. [PMID: 8113744 DOI: 10.1099/0022-1317-75-1-95] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
DNA isolated from biopsies of endemic Burkitt's lymphoma (BL) from New Guinea was analysed for the presence of Epstein-Barr virus (EBV) sequences using the polymerase chain reaction. Primers were designed to amplify sequences within the Epstein-Barr virus nuclear antigen (EBNA) 1 and 2 genes. These analyses detected the EBNA1 sequence in all the biopsies studied. Additional sets of primers directed against the EBNA2 gene were used in order to categorize the EBV strains as A-type or B-type (39% A-type; 50% B-type; 5% A- and B-type; 5% untypeable). These results indicated that DNA sequence heterogeneity within the EBNA2 gene region may exist in different strains of EBV. The extent of DNA sequence heterogeneity among different strains of EBV was determined by sequencing of a region within the EBNA2 gene in a number of different A-type and B-type strains of EBV originating from Africa or New Guinea. The results demonstrated DNA sequence heterogeneity within the EBNA2 gene in different strains of EBV. This heterogeneity was more extensive among A-type strains than B-type strains of EBV.
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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] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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Sinha SN, Sengupta SK. Surgical thyroid disease in Papua New Guinea. THE AUSTRALIAN AND NEW ZEALAND JOURNAL OF SURGERY 1993; 63:878-82. [PMID: 8216066 DOI: 10.1111/j.1445-2197.1993.tb00363.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
A clinical and histopathological analysis was carried out on 376 thyroid specimens removed under various diagnoses from the surgical clinics of Papua New Guinea over a period of 11 years (1980-90). Solitary nodular goitre (solid and cystic) was the most common clinical diagnosis. Nineteen per cent of the solid and 35% of the cystic solitary nodular goitres were found to be malignant. Malignant goitres were confirmed histologically in 73.3% of the clinically diagnosed cases of malignancy. The presence of amyloid goitre (1.9%) posed a significant diagnostic and therapeutic problem due to its clinical features resembling that of malignant goitre. Hemithyroidectomy (lobectomy) was the most common surgical procedure employed for all unilateral thyroid lesions and partial or subtotal thyroidectomy was performed for benign and most malignant lesions.
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Kuo KS, Welch RM, Weger RC, Engelstad MA, Sengupta SK. The three-dimensional structure of cumulus clouds over the ocean: 1. Structural analysis. ACTA ACUST UNITED AC 1993. [DOI: 10.1029/93jd02331] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Abstract
Malignant tumors registered with the Tumour Registry of Papua New Guinea (PNG) from 1958-1988 were analyzed with emphasis on the variation of incidence with time and different regions. Cancer incidence was generally low in PNG. During this period, carcinoma of oral cavity, cervix, breast, and skin, hepatoma, and lymphoma were the most common types of malignant lesions detected. The incidence of carcinoma of the oral cavity has increased. Currently, it is more common in the Highlands region and is associated with the spread of betel nut chewing. A threefold increase in cervical carcinoma registration was observed nationally, with a sixfold increase in the Highlands region; this was attributed both to social changes and improved registration. The incidence of breast cancer has doubled, in keeping with better registration, but there is little interregional variation. The decline in registrations of hepatocellular carcinoma is artifactual. PNG is a high-incidence area for Burkitt lymphoma, but Hodgkin disease is rare. Both Burkitt and other non-Hodgkin lymphomas are uncommon in the Highlands. A decline in the incidence of squamous carcinoma of skin was observed that was associated with improved control of tropical ulcers. The incidence of stomach cancer is falling. The registered cancer incidence in PNG is low, even when compared with that in native people from other Pacific nations, such as Fijians and New Caledonian Melanesians. Preventive measures have been hitherto ineffective, with the exception of squamous carcinoma of skin.
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Phelps G, Srinivasa A, Sengupta SK. Gastric stenosis following the ingestion of car battery acid. PAPUA AND NEW GUINEA MEDICAL JOURNAL 1991; 34:61-4. [PMID: 2058305] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The acute consequences of the ingestion of corrosive substances include acute necrosis of the upper gastrointestinal tract, haemorrhage and perforation. Late complications include the development of stenotic lesions. A case of fibrous gastric stenosis following the ingestion of car battery acid is presented. Endoscopically, the appearances were consistent with gastric carcinoma.
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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] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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Dengler J, König E, Larkworthy LF, Ritter G, Sengupta SK. Intermediate electronic relaxation betweenS=3/2 andS=1/2 states in Fe(J-mph)NO with a jäger-type ligand J-mph. ACTA ACUST UNITED AC 1990. [DOI: 10.1007/bf02405455] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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