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Lahiri S, Sahu GK, Baruah S, Jana B, Dixit AR, Bhardwaj RL, Das RC, Kalra R, Kaushik V, Majumder A, Mohapatra S, Dikshit B, Mishra KK, Bhatia MS, Bapat AV, Mago VK, Thakur KB, Das AK, Gantayet LM. Comparative study of evaporation using DC and AC filament electron guns. ACTA ACUST UNITED AC 2012. [DOI: 10.1088/1742-6596/390/1/012016] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Sharma S, Choudhury KB, Mandal S, Majumder A. Primary squamous cell carcinoma of kidney - a case report of unusual local recurrence with literature review. BANGLADESH JOURNAL OF MEDICAL SCIENCE 2012. [DOI: 10.3329/bjms.v11i3.11734] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
Primary squamous cell carcinoma of the kidney is a rare clinical entity. Primary squamous cell carcinoma is more frequently reported in urinary bladder and male urethra than in kidney. Primary renal squamous cell carcinoma (RSCC) accounts for less than 5% of urothelial tumours in urinary system. Very few cases of primary squamous cell carcinoma of kidney have been reported in the world literature. Only forty-six cases over forty four years had been reported from Mayo Clinic. These neoplasms are highly aggressive and locally advanced or metastatic at the time of presentation. Here we report such a case of primary squamous cell carcinoma of kidney in a 50-year-old lady at a locally recurrent stage with fistulous tract formation. Palliative radiotherapy came out to be a good clinical modality even in locally recurrent stage in this patient. DOI: http://dx.doi.org/10.3329/bjms.v11i3.11734 Bangladesh Journal of Medical Science Vol. 11 No. 03 July12
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Hachem MA, Fredslund F, Andersen JM, Jonsgaard Larsen R, Majumder A, Ejby M, Van Zanten G, Lahtinen SJ, Barrangou R, Klaenhammer T, Jacobsen S, Coutinho PM, Lo Leggio L, Svensson B. Raffinose family oligosaccharide utilisation by probiotic bacteria: insight into substrate recognition, molecular architecture and diversity of GH36 α-galactosidases. BIOCATAL BIOTRANSFOR 2012. [DOI: 10.3109/10242422.2012.674717] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Sarkar DK, Panda N, Biswas S, Saha ML, Majumder A. Is immediate postoperative CA15.3 assay a predictive marker of early postoperative recurrence of carcinoma breast? JOURNAL OF THE INDIAN MEDICAL ASSOCIATION 2012; 110:146-147. [PMID: 23029943] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Breast cancer is still an enigma. Systemic metastasis is an important prognostic factor. Tumour marker can predict occult systemic metastasis. To evaluate the immediate postoperative CA15.3 as predictor of early recurrence, a study was carried out in 48 patients of carcinoma breast in whom immediate postoperative marker level was done. In follow-up, recurrence was noted and relation with tumour size and stage done. Null hypothesis and 't' test were used for analysis. Relation of tumour size with marker is weak but strong relation exists between tumour stage with marker and recurrence with marker. CA15.3 predicts tumour load, can also predict occult residual/occult metastatic disease better than other prognostic markers which only predict tumour behaviour.
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Das S, Badani PM, Sharma P, Vatsa RK, Das D, Majumder A, Das AK. Multiphoton ionization and Coulomb explosion of C2H5Br clusters: a mass spectrometric and charge density study. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2011; 25:1028-1036. [PMID: 21452379 DOI: 10.1002/rcm.4951] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2010] [Revised: 01/20/2011] [Accepted: 01/22/2011] [Indexed: 05/30/2023]
Abstract
Using time-of-flight mass spectrometry (TOFMS), laser-induced photochemistry of ethyl bromide clusters has been investigated at three different wavelengths (viz. 266, 355 and 532 nm) utilizing nanosecond laser pulses of ~5 × 10(9) W/cm(2). An interesting finding of the present work is the observation of multiply charged atomic ions of carbon and bromine at 355 and 532 nm, arising from the Coulomb explosion of (C(2)H(5)Br)(n) clusters. At 266 nm, however, the (C(2)H(5)Br)(n) clusters were found to exhibit the usual multiphoton dissociation/ionization behaviour. The TOFMS studies are complemented by measuring the total charge density of the ionized volume at 266, 355 and 532 nm, using the parallel plate method, and the charge densities were found to be ~2 × 10(9), 6 × 10(9) and 2 × 10(11) charges/cm(3), respectively. The significantly higher charge density and the presence of energetic, multiply charged atomic ions at 532 nm are explained by the higher ponderomotive energy of the 532 nm photon, coupled with the Coulomb stability of the residual multiply charged ethyl bromide clusters generated upon laser irradiation, due to their larger effective cluster size at 532 nm than at 355 and 266 nm.
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Baskin R, Majumder A, P. Sayeski P. The Recent Medicinal Chemistry Development of Jak2 Tyrosine Kinase Small Molecule Inhibitors. Curr Med Chem 2010; 17:4551-8. [DOI: 10.2174/092986710794182953] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2010] [Accepted: 10/16/2010] [Indexed: 11/22/2022]
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Majumder A, Sayeski P. Tyrosine-protein kinase JAK2 inhibitors for the treatment of myeloproliferative neoplasms. DRUG FUTURE 2010. [DOI: 10.1358/dof.2010.035.08.1514131] [Citation(s) in RCA: 2] [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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Qin GY, Majumder A, Song H, Heinz U. Energy and momentum deposited into a QCD medium by a jet shower. PHYSICAL REVIEW LETTERS 2009; 103:152303. [PMID: 19905626 DOI: 10.1103/physrevlett.103.152303] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2009] [Indexed: 05/28/2023]
Abstract
For a hard parton moving through a dense QCD medium, we compute self-consistently the energy loss and the fraction deposited into the medium due to showering and rescattering of the shower, assuming weak coupling between probe and medium. The same transport coefficients thus determine both the energy loss and its deposition into the medium. This allows a parameter free calculation of the latter once the former are computed or measured. We compute them for a weakly interacting medium. Assuming a short thermalization time for the deposited energy, we determine the medium's hydrodynamical response and obtain a conical pattern that is strongly enhanced by showering.
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Majumder A, Dikshit B, Bhatia MS, Mago VK. Use of multiwavelength emission from hollow cathode lamp for measurement of state resolved atom density of metal vapor produced by electron beam evaporation. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2008; 79:093305. [PMID: 19044405 DOI: 10.1063/1.2987689] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
State resolved atom population of metal vapor having low-lying metastable states departs from equilibrium value. It needs to be experimentally investigated. This paper reports the use of hollow cathode lamp based atomic absorption spectroscopy technique to measure online the state resolved atom density (ground and metastable) of metal vapor in an atomic beam produced by a high power electron gun. In particular, the advantage of availability of multiwavelength emission in hollow cathode lamp is used to determine the atom density in different states. Here, several transitions pertaining to a given state have also been invoked to obtain the mean value of atom density thereby providing an opportunity for in situ averaging. It is observed that at higher source temperatures the atoms from metastable state relax to the ground state. This is ascribed to competing processes of atom-atom and electron-atom collisions. The formation of collision induced virtual source is inferred from measurement of atom density distribution profile along the width of the atomic beam. The total line-of-sight average atom density measured by absorption technique using hollow cathode lamp is compared to that measured by atomic vapor deposition method. The presence of collisions is further supported by determination of beaming exponent by numerically fitting the data.
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Majumder A, Wang E, Wang XN. Modified dihadron fragmentation functions in hot and nuclear matter. PHYSICAL REVIEW LETTERS 2007; 99:152301. [PMID: 17995159 DOI: 10.1103/physrevlett.99.152301] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2006] [Revised: 07/16/2007] [Indexed: 05/25/2023]
Abstract
Medium modification of dihadron fragmentation functions due to gluon bremsstrahlung induced by multiple partonic scattering is studied in both deep-inelastic scattering (DIS) off large nuclei and high-energy heavy-ion collisions within the same framework of twist expansion. The modification for dihadrons is found to closely follow that for single hadrons, leading to a weak nuclear suppression of their ratios in DIS experiments. A mild enhancement of the near-side correlation of two high transverse momentum hadrons with increasing centrality is found in heavy-ion collisions due to trigger bias and the rise in parton energy loss with centrality. Successful comparisons between theory and experiment for multihadron observables in both confining and deconfined media offer comprehensive evidence for partonic energy loss as the mechanism of jet modification in dense matter.
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Majumder A, Müller B, Bass SA. Longitudinal broadening of quenched jets in turbulent color fields. PHYSICAL REVIEW LETTERS 2007; 99:042301. [PMID: 17678353 DOI: 10.1103/physrevlett.99.042301] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2006] [Revised: 04/03/2007] [Indexed: 05/16/2023]
Abstract
The nearside distribution of particles at intermediate transverse momentum, associated with a high momentum trigger hadron produced in a high energy heavy-ion collision, is broadened in rapidity compared with the jet cone. This broadened distribution is thought to contain the energy lost by the progenitor parton of the trigger hadron. We show that the broadening can be explained as the final-state deflection of the gluons radiated from the hard parton inside the medium by soft, transversely oriented, turbulent color fields that arise in the presence of plasma instabilities. The magnitude of the effect is found to grow with medium size and density and diminish with increasing energy of the associated hadron.
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Bharali S, Purama RK, Majumder A, Fontes CMGA, Goyal A. Functional characterization and mutation analysis of family 11, Carbohydrate-Binding Module (CtCBM11) of cellulosomal bifunctional cellulase from Clostridium thermocellum. Indian J Microbiol 2007; 47:109-18. [PMID: 23100652 PMCID: PMC3450102 DOI: 10.1007/s12088-007-0023-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2006] [Revised: 03/25/2007] [Accepted: 04/18/2007] [Indexed: 10/23/2022] Open
Abstract
The non-catalytic, family 11 carbohydrate binding module (CtCBM11) belonging to a bifunctional cellulosomal cellulase from Clostridium thermocellum was hyper-expressed in E. coli and functionally characterized. Affinity electrophoresis of CtCBM11 on nondenaturing PAGE containing cellulosic polysaccharides showed binding with β-glucan, lichenan, hydroxyethyl cellulose and carboxymethyl cellulose. In order to elucidate the involvement of conserved aromatic residues Tyr 22, Trp 65 and Tyr 129 in the polysaccharide binding, site-directed mutagenesis was carried out and the residues were changed to alanine. The results of affinity electrophoresis and binding adsorption isotherms showed that of the three mutants Y22A, W65A and Y129A of CtCBM11, two mutants Y22A and Y129A showed no or reduced binding affinity with polysaccharides. These results showed that tyrosine residue 22 and 129 are involved in the polysaccharide binding. These residues are present in the putative binding cleft and play a critical role in the recognition of all the ligands recognized by the protein.
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Majumder A, Farquhar-Smith P, Burlacu CL, Buggy DJ. Coexisting Harlequin and Horner's syndromes. Br J Anaesth 2007; 98:147. [PMID: 17158132 DOI: 10.1093/bja/ael301] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Majumder A, Ng L. Phantom capnograph. Anaesthesia 2006; 61:1128. [PMID: 17042874 DOI: 10.1111/j.1365-2044.2006.04855.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Koch V, Majumder A, Wang XN. Cherenkov radiation from jets in heavy-ion collisions. PHYSICAL REVIEW LETTERS 2006; 96:172302. [PMID: 16712291 DOI: 10.1103/physrevlett.96.172302] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2005] [Indexed: 05/09/2023]
Abstract
The possibility of Cherenkov-like gluon bremsstrahlung in dense matter is studied. We point out that the occurrence of Cherenkov radiation in dense matter is sensitive to the presence of partonic bound states. This is illustrated by a calculation of the dispersion relation of a massless particle in a simple model in which it couples to two different massive resonance states. We further argue that detailed spectroscopy of jet correlations can directly probe the index of refraction of this matter, which in turn will provide information about the mass scale of these partonic bound states.
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Koch V, Majumder A, Randrup J. Baryon-strangeness correlations: a diagnostic of strongly interacting matter. PHYSICAL REVIEW LETTERS 2005; 95:182301. [PMID: 16383895 DOI: 10.1103/physrevlett.95.182301] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2005] [Indexed: 05/05/2023]
Abstract
The correlation between baryon number and strangeness elucidates the nature of strongly interacting matter, such as that formed transiently in high-energy nuclear collisions. This diagnostic can be extracted theoretically from lattice QCD calculations and experimentally from event-by-event fluctuations. The analysis of present lattice results above the critical temperature severely limits the presence of qq bound states, thus supporting a picture of independent (quasi)quarks.
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Ghosh B, Sengupta S, Bhattacharjee B, Majumder A, Sarkar SB. Fenofibrate-induced myopathy. Neurol India 2004; 52:268-9. [PMID: 15269493] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
Abstract
Fenofibrate induced myopathy is a rare adverse event. We present a case of muscle pain and quadriparesis following administration of 200mg of fenofibrate for 35 days. Patient gradually improved after stopping the drug. As per our knowledge, this is probably the first case report of fenofibrate induced myopathy from India.
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Majumder A, Gale C. Erratum: Dileptons from a quark-gluon plasma with finite baryon density [Phys. Rev. D63, 114008 (2001)]. Int J Clin Exp Med 2001. [DOI: 10.1103/physrevd.64.119901] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Majumder A, Basak S, Raha T, Chowdhury SP, Chattopadhyay D, Roy S. Effect of osmolytes and chaperone-like action of P-protein on folding of nucleocapsid protein of Chandipura virus. J Biol Chem 2001; 276:30948-55. [PMID: 11413127 DOI: 10.1074/jbc.m011705200] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Amino acid sequences of nucleocapsid proteins are mostly conserved among different rhabdoviruses. The protein plays a common functional role in different RNA viruses by enwrapping the viral genomic RNA in an RNase-resistant form. Upon expression of the nucleocapsid protein alone in COS cells and in bacteria, it forms large insoluble aggregates. In this work, we have reported for the first time the full-length cloning of the N gene of Chandipura virus and its expression in Escherichia coli in a soluble monomeric form and purification using nonionic detergents. The biological activity of the soluble recombinant protein has been tested, and it was found to possess efficient RNA-binding ability. The state of aggregation of the recombinant protein was monitored using light scattering. In the absence of nonionic detergents, it formed large aggregates. Aggregation was significantly reduced in the presence of osmolytes such as d-sorbitol. Aggregate formation was suppressed in the presence of another viral product, phosphoprotein P, in a chaperone-like manner. Both the osmolyte and phosphoprotein P also suppressed aggregation to a great extent during refolding from a guanidine hydrochloride-denatured form. The function of the phosphoprotein and osmolyte appears to be synergistic to keep the N-protein in a soluble biologically competent form in virus-infected cells.
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Chen CC, Fang M, Majumder A, Wu HY. A 72-base pair AT-rich DNA sequence element functions as a bacterial gene silencer. J Biol Chem 2001; 276:9478-85. [PMID: 11121424 DOI: 10.1074/jbc.m010501200] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
We have previously demonstrated that sequential activation of the bacterial ilvIH-leuO-leuABCD gene cluster involves a promoter-relay mechanism. In the current study, we show that the final activation of the leuABCD operon is through a transcriptional derepression mechanism. The leuABCD operon is transcriptionally repressed by the presence of a 318-base pair AT-rich upstream element. LeuO is required for derepressing the repressed leuABCD operon. Deletion analysis of the repressive effect of the 318-bp element has led to the identification of a 72-bp AT-rich (78% A+T) DNA sequence element, AT4, which is capable of silencing a number of unrelated promoters in addition to the leuABCD promoter. AT4-mediated gene silencing is orientation-independent and occurs within a distance of 300 base pairs. Furthermore, an increased gene-silencing effect was observed with a tandemly repeated AT4 dimer. The possible mechanism of AT4-mediated gene silencing in bacteria is discussed.
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Majumder A, Fang M, Tsai KJ, Ueguchi C, Mizuno T, Wu HY. LeuO expression in response to starvation for branched-chain amino acids. J Biol Chem 2001; 276:19046-51. [PMID: 11376008 DOI: 10.1074/jbc.m100945200] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The recently identified role of LeuO in the regulation of transcription has prompted us to search for the specific function(s) of LeuO in bacterial physiology. The cryptic nature of expression of leuO has previously limited such analysis. A conditional leuO expression was found when bacteria enter stationary phase and was shown to be guanosine 3',5'-bispyrophosphate-dependent. Multiple physiological events, including the stringent response, are induced upon the increase of the bacterial stress signal, guanosine 3',5'-bispyrophosphate. In this study, we tested whether LeuO was directly involved in the bacterial stringent response. LeuO was shown to be indispensable for growth resumption following a 2-h growth arrest caused by starvation for branched-chain amino acids in an E. coli K-12 relA1 strain. This result supports a functional role for LeuO in the bacterial stringent response.
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Fang M, Majumder A, Tsai KJ, Wu HY. ppGpp-dependent leuO expression in bacteria under stress. Biochem Biophys Res Commun 2000; 276:64-70. [PMID: 11006083 DOI: 10.1006/bbrc.2000.3440] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Despite the known potential transcription regulatory role of leuO gene product, LeuO, the condition when leuO expresses during bacterial growth cycle remains unclear. Mechanistically, leuO expression was shown to be part of promoter relay mechanism, however, the factor(s) responsible for the regulation of leuO expression is not known. Combining Northern and Western results, we demonstrate in the present communication that leuO expression is normally low and enhanced when bacteria are in transition from exponential growth to stationary phase. The stationary phase-associated leuO expression is ppGpp dependent and rpoS (sigma(s) factor) independent.
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Mandal SC, Kumar CK, Majumder A, Majumder R, Maity BC. Antibacterial activity of Litsea glutinosa bark. Fitoterapia 2000; 71:439-41. [PMID: 10925020 DOI: 10.1016/s0367-326x(00)00132-5] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The methanol extract of the bark of Litsea glutinosa showed antibacterial activity, comparable to chloramphenicol, against all 16 tested microorganisms.
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Chatterjee M, Majumder A, Iyer P, Muthukrishnan G, Das MK, Ramamoorthy N, Desai CN, Banerjee S. Anomalies in hepatobiliary excretion of technetium-99m-MAG3 preparations. Nucl Med Biol 1996; 23:867-72. [PMID: 8971853 DOI: 10.1016/s0969-8051(96)00116-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Technetium-99m-MAG3 is accepted as a renal tubular function agent. However, sporadic liver and gall bladder visualisation during its clinical use is clearly a disadvantage. HPLC-purified 99mTc-MAG3 samples exhibited appreciable hepatobiliary uptake (7%), and an elevated level of such uptake was observed in unpurified kit preparations, which was stated to be associated with the excretory property of the radiolabeled kit impurities. To verify this we attempted to quantitate the hepatobiliary uptake of the kit preparations with that of its radiolabeled components. The contribution of each component toward hepatobiliary uptake of the sample was calculated from their abundance in the chelate mixture and the individual biodistribution of the isolated components. However, the anticipated hepatobiliary uptake of different preparations of 99mTc-MAG3 calculated in this way was always lower than that of the experimental value determined directly. Further work is needed to explain the anomaly.
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