1
|
Gonçalez Filho W, Borga M, Geens K, Cingu D, Chatterjee U, Banerjee S, Vohra A, Han H, Minj A, Hahn H, Marx M, Fahle D, Bakeroot B, Decoutere S. Development and analysis of thick GaN drift layers on 200 mm CTE-matched substrate for vertical device processing. Sci Rep 2023; 13:15931. [PMID: 37741914 PMCID: PMC10517926 DOI: 10.1038/s41598-023-42747-1] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2023] [Accepted: 09/14/2023] [Indexed: 09/25/2023] Open
Abstract
This work reports the epitaxial growth of 8.5 µm-thick GaN layers on 200 mm engineered substrates with a polycrystalline AlN core (QST by QROMIS) for CMOS compatible processing of vertical GaN power devices. The epitaxial stack contains a 5 [Formula: see text]m thick drift layers with a Si doping density of 2 × 1016 cm-3 and total threading dislocation density of 4 × 108 cm-2. The thick drift layer requires fine-tuning of the epitaxial growth conditions to keep wafer bow under control and to avoid the formation of surface defects. Diode test structures processed with this epitaxial stack achieved hard breakdown voltages > 750 V, which is shown to be limited by impurity or metal diffusion from the contact metal stack into threading dislocations. Conductive Atomic Force Microscopy (cAFM) reveals some leakage contribution from mixed type dislocations, which have their core structure identified as the double 5/6 atom configuration by scanning transmission electron microscopy images. Modelling of the leakage conduction mechanism with one-dimensional hopping conduction shows good agreement with the experimental data, and the resulting fitting parameters are compared to similar findings on silicon substrates. The outcome of this work is important to understand the possibilities and limitations of vertical GaN devices fabricated on large diameter wafers.
Collapse
Affiliation(s)
- Walter Gonçalez Filho
- IMEC-Interuniversity Microelectronics Center, Kapeldreef 75, 3001, Leuven, Belgium.
- CMST-IMEC, Ghent University, Technologiepark 126, 9052, Ghent, Belgium.
| | - Matteo Borga
- IMEC-Interuniversity Microelectronics Center, Kapeldreef 75, 3001, Leuven, Belgium
| | - Karen Geens
- IMEC-Interuniversity Microelectronics Center, Kapeldreef 75, 3001, Leuven, Belgium
| | - Deepthi Cingu
- IMEC-Interuniversity Microelectronics Center, Kapeldreef 75, 3001, Leuven, Belgium
| | - Urmimala Chatterjee
- IMEC-Interuniversity Microelectronics Center, Kapeldreef 75, 3001, Leuven, Belgium
| | - Sourish Banerjee
- IMEC-Interuniversity Microelectronics Center, Kapeldreef 75, 3001, Leuven, Belgium
| | - Anurag Vohra
- IMEC-Interuniversity Microelectronics Center, Kapeldreef 75, 3001, Leuven, Belgium
| | - Han Han
- IMEC-Interuniversity Microelectronics Center, Kapeldreef 75, 3001, Leuven, Belgium
| | - Albert Minj
- IMEC-Interuniversity Microelectronics Center, Kapeldreef 75, 3001, Leuven, Belgium
| | - Herwig Hahn
- Aixtron SE, Dornkaulstr. 2, 52134, Herzogenrath, Germany
| | - Matthias Marx
- Aixtron SE, Dornkaulstr. 2, 52134, Herzogenrath, Germany
| | - Dirk Fahle
- Aixtron SE, Dornkaulstr. 2, 52134, Herzogenrath, Germany
| | - Benoit Bakeroot
- IMEC-Interuniversity Microelectronics Center, Kapeldreef 75, 3001, Leuven, Belgium
- CMST-IMEC, Ghent University, Technologiepark 126, 9052, Ghent, Belgium
| | - Stefaan Decoutere
- IMEC-Interuniversity Microelectronics Center, Kapeldreef 75, 3001, Leuven, Belgium
| |
Collapse
|
2
|
Ma S, Yu H, Yu B, Gill J, Khan M, Chatterjee U, Iovoli A, Farrugia M, Singh A. Optimal Threshold of Smoking in Pack-Years and its Association with Survival Outcomes Among Patients Treated with Chemoradiation for Head and Neck Cancer. Int J Radiat Oncol Biol Phys 2022. [DOI: 10.1016/j.ijrobp.2022.07.1386] [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: 10/31/2022]
|
3
|
Arndt T, Jaudzems K, Shilkova O, Francis J, Johansson M, Laity PR, Sahin C, Chatterjee U, Kronqvist N, Barajas-Ledesma E, Kumar R, Chen G, Strömberg R, Abelein A, Langton M, Landreh M, Barth A, Holland C, Johansson J, Rising A. Spidroin N-terminal domain forms amyloid-like fibril based hydrogels and provides a protein immobilization platform. Nat Commun 2022; 13:4695. [PMID: 35970823 PMCID: PMC9378615 DOI: 10.1038/s41467-022-32093-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2021] [Accepted: 07/15/2022] [Indexed: 11/24/2022] Open
Abstract
Recombinant spider silk proteins (spidroins) have multiple potential applications in development of novel biomaterials, but their multimodal and aggregation-prone nature have complicated production and straightforward applications. Here, we report that recombinant miniature spidroins, and importantly also the N-terminal domain (NT) on its own, rapidly form self-supporting and transparent hydrogels at 37 °C. The gelation is caused by NT α-helix to β-sheet conversion and formation of amyloid-like fibrils, and fusion proteins composed of NT and green fluorescent protein or purine nucleoside phosphorylase form hydrogels with intact functions of the fusion moieties. Our findings demonstrate that recombinant NT and fusion proteins give high expression yields and bestow attractive properties to hydrogels, e.g., transparency, cross-linker free gelation and straightforward immobilization of active proteins at high density. Recombinant spider silks are of interest but the multimodal and aggregation-prone nature of them is a limitation. Here, the authors report on a miniature spidroin based on the N-terminal domain which forms a hydrogel at 37 °C which allows for ease of production and fusion protein modification to generate functional biomaterials.
Collapse
Affiliation(s)
- Tina Arndt
- Department of Biosciences and Nutrition, Karolinska Institutet, Neo, Blickagången 16, Huddinge, 141 52, Sweden
| | - Kristaps Jaudzems
- Department of Physical Organic Chemistry, Latvian Institute of Organic Synthesis, Riga, LV-1006, Latvia
| | - Olga Shilkova
- Department of Biosciences and Nutrition, Karolinska Institutet, Neo, Blickagången 16, Huddinge, 141 52, Sweden
| | - Juanita Francis
- Department of Biosciences and Nutrition, Karolinska Institutet, Neo, Blickagången 16, Huddinge, 141 52, Sweden
| | - Mathias Johansson
- Department of Molecular Sciences, Swedish University of Agricultural Sciences, Uppsala, 750 07, Sweden, Box 7015
| | - Peter R Laity
- Department of Materials Science and Engineering, The University of Sheffield, Sir Robert Hadfield Building, Mappin Street, Sheffield, S1 3JD, UK
| | - Cagla Sahin
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Solnavägen 9, 171 65, Solna, Sweden
| | - Urmimala Chatterjee
- Department of Biosciences and Nutrition, Karolinska Institutet, Neo, Blickagången 16, Huddinge, 141 52, Sweden
| | - Nina Kronqvist
- Department of Biosciences and Nutrition, Karolinska Institutet, Neo, Blickagången 16, Huddinge, 141 52, Sweden
| | - Edgar Barajas-Ledesma
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Solnavägen 9, 171 65, Solna, Sweden
| | - Rakesh Kumar
- Department of Biosciences and Nutrition, Karolinska Institutet, Neo, Blickagången 16, Huddinge, 141 52, Sweden
| | - Gefei Chen
- Department of Biosciences and Nutrition, Karolinska Institutet, Neo, Blickagången 16, Huddinge, 141 52, Sweden
| | - Roger Strömberg
- Department of Biosciences and Nutrition, Karolinska Institutet, Neo, Blickagången 16, Huddinge, 141 52, Sweden
| | - Axel Abelein
- Department of Biosciences and Nutrition, Karolinska Institutet, Neo, Blickagången 16, Huddinge, 141 52, Sweden
| | - Maud Langton
- Department of Molecular Sciences, Swedish University of Agricultural Sciences, Uppsala, 750 07, Sweden, Box 7015
| | - Michael Landreh
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Solnavägen 9, 171 65, Solna, Sweden
| | - Andreas Barth
- Department of Biochemistry and Biophysics, The Arrhenius Laboratories for Natural Sciences, Stockholm University, 10691, Stockholm, Sweden
| | - Chris Holland
- Department of Materials Science and Engineering, The University of Sheffield, Sir Robert Hadfield Building, Mappin Street, Sheffield, S1 3JD, UK
| | - Jan Johansson
- Department of Biosciences and Nutrition, Karolinska Institutet, Neo, Blickagången 16, Huddinge, 141 52, Sweden
| | - Anna Rising
- Department of Biosciences and Nutrition, Karolinska Institutet, Neo, Blickagången 16, Huddinge, 141 52, Sweden. .,Department of Anatomy, Physiology and Biochemistry, Swedish University of Agricultural Sciences, Uppsala, 750 07, Sweden.
| |
Collapse
|
4
|
Ma S, Khan M, Gill J, Santhosh S, Chatterjee U, Iovoli A, Farrugia M, Wooten K, Gupta V, Mcspadden R, Yu H, Kuriakose M, Markiewicz M, Hicks W, Platek M, Seshadri M, Ray A, Repasky E, Singh A. Optimal Threshold of Pre-Treatment Hemoglobin Level as a Prognostic Biomarker for Survival Outcome in Patients with Head and Neck Cancer in the Era of Human Papillomavirus. Int J Radiat Oncol Biol Phys 2022. [DOI: 10.1016/j.ijrobp.2021.12.052] [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: 10/18/2022]
|
5
|
Ma S, Khan M, Gill J, Santhosh S, Chatterjee U, Iovoli A, Farrugia M, Wooten K, Gupta V, Mcspadden R, Yu H, Kuriakose M, Markiewicz M, Hicks W, Platek M, Seshadri M, Ray A, Repasky E, Singh A. Optimal Threshold of Neutrophil-Lymphocyte Ratio and its Association with Survival Outcome Among Patients with Head and Neck Cancer in the United States. Int J Radiat Oncol Biol Phys 2022. [DOI: 10.1016/j.ijrobp.2021.12.038] [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: 11/16/2022]
|
6
|
Hansson ML, Chatterjee U, Francis J, Arndt T, Broman C, Johansson J, Sköld MK, Rising A. Artificial spider silk supports and guides neurite extension in vitro. FASEB J 2021; 35:e21896. [PMID: 34634154 DOI: 10.1096/fj.202100916r] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Revised: 08/01/2021] [Accepted: 08/17/2021] [Indexed: 01/09/2023]
Abstract
Surgical intervention with the use of autografts is considered the gold standard to treat peripheral nerve injuries. However, a biomaterial that supports and guides nerve growth would be an attractive alternative to overcome problems with limited availability, morbidity at the site of harvest, and nerve mismatches related to autografts. Native spider silk is a promising material for construction of nerve guidance conduit (NGC), as it enables regeneration of cm-long nerve injuries in sheep, but regulatory requirements for medical devices demand synthetic materials. Here, we use a recombinant spider silk protein (NT2RepCT) and a functionalized variant carrying a peptide derived from vitronectin (VN-NT2RepCT) as substrates for nerve growth support and neurite extension, using a dorsal root ganglion cell line, ND7/23. Two-dimensional coatings were benchmarked against poly-d-lysine and recombinant laminins. Both spider silk coatings performed as the control substrates with regards to proliferation, survival, and neurite growth. Furthermore, NT2RepCT and VN-NT2RepCT spun into continuous fibers in a biomimetic spinning set-up support cell survival, neurite growth, and guidance to an even larger extent than native spider silk. Thus, artificial spider silk is a promising biomaterial for development of NGCs.
Collapse
Affiliation(s)
- Magnus L Hansson
- Department of Biosciences and Nutrition, Karolinska Institutet, Huddinge, Sweden.,Experimental Traumatology Unit, Department of Neuroscience, Biomedicum B8 Karolinska Institutet, Stockholm, Sweden
| | - Urmimala Chatterjee
- Department of Biosciences and Nutrition, Karolinska Institutet, Huddinge, Sweden
| | - Juanita Francis
- Department of Biosciences and Nutrition, Karolinska Institutet, Huddinge, Sweden
| | - Tina Arndt
- Department of Biosciences and Nutrition, Karolinska Institutet, Huddinge, Sweden
| | - Christian Broman
- Experimental Traumatology Unit, Department of Neuroscience, Biomedicum B8 Karolinska Institutet, Stockholm, Sweden
| | - Jan Johansson
- Department of Biosciences and Nutrition, Karolinska Institutet, Huddinge, Sweden
| | - Mattias K Sköld
- Experimental Traumatology Unit, Department of Neuroscience, Biomedicum B8 Karolinska Institutet, Stockholm, Sweden.,Department of Neuroscience, Section of Neurosurgery, Uppsala University, Uppsala, Sweden
| | - Anna Rising
- Department of Biosciences and Nutrition, Karolinska Institutet, Huddinge, Sweden.,Department of Anatomy, Physiology and Biochemistry, Swedish University of Agricultural Sciences, Uppsala, Sweden
| |
Collapse
|
7
|
Champion de Crespigny C, Shetty P, Inglis E, Anpalagan A, Chatterjee U, Alahakoon TI. Successful pregnancy with fundal placenta percreta replacing the myometrial defect from previous uterine rupture. J OBSTET GYNAECOL 2019; 39:853-855. [PMID: 30915874 DOI: 10.1080/01443615.2018.1557125] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
| | - P Shetty
- b Westmead Institute for Maternal and Fetal Medicine , Westmead Hospital , Westmead , Australia
| | - E Inglis
- a Department of Obstetrics and Gynaecology , Westmead Hospital , Westmead , Australia
| | - A Anpalagan
- a Department of Obstetrics and Gynaecology , Westmead Hospital , Westmead , Australia
| | - U Chatterjee
- a Department of Obstetrics and Gynaecology , Westmead Hospital , Westmead , Australia
| | - T I Alahakoon
- b Westmead Institute for Maternal and Fetal Medicine , Westmead Hospital , Westmead , Australia.,c Westmead Clinical School , The University of Sydney , Sydney , Australia
| |
Collapse
|
8
|
|
9
|
Das S, Majumder B, Islam N, Das RN, Chatterjee U, Saha K, Datta C, Ghosh D. Fine needle aspiration cytology aided categorisation of neuroblastic tumours: a report of two cases. Cytopathology 2016; 28:432-435. [PMID: 27288220 DOI: 10.1111/cyt.12356] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/14/2016] [Indexed: 11/29/2022]
Affiliation(s)
- S. Das
- Department of Pathology; Institute of Post Graduate Medical Education & Research, Kolkata, India and IPGME&R & SSKM Hospital; Kolkata West Bengal India
| | - B. Majumder
- Department of Pathology; Institute of Post Graduate Medical Education & Research, Kolkata, India and IPGME&R & SSKM Hospital; Kolkata West Bengal India
| | - N. Islam
- Department of Pathology; Institute of Post Graduate Medical Education & Research, Kolkata, India and IPGME&R & SSKM Hospital; Kolkata West Bengal India
| | - R. N. Das
- Department of Pathology; Institute of Post Graduate Medical Education & Research, Kolkata, India and IPGME&R & SSKM Hospital; Kolkata West Bengal India
| | - U. Chatterjee
- Department of Pathology; Institute of Post Graduate Medical Education & Research, Kolkata, India and IPGME&R & SSKM Hospital; Kolkata West Bengal India
| | - K. Saha
- Paediatric Surgery; Nilratan Sarkar Medical College & Hospital; Kolkata West Bengal India
| | - C. Datta
- Department of Pathology; Institute of Post Graduate Medical Education & Research, Kolkata, India and IPGME&R & SSKM Hospital; Kolkata West Bengal India
| | - D. Ghosh
- Paediatric Surgery; Nilratan Sarkar Medical College & Hospital; Kolkata West Bengal India
| |
Collapse
|
10
|
Das S, Ghosh R, Sen A, Das RN, Saha K, Chatterjee U. Fine needle aspiration cytology diagnosis of a pancreatoblastoma in an infant: case report with a summary of prior published cases. Cytopathology 2016; 27:479-482. [PMID: 27038102 DOI: 10.1111/cyt.12324] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/03/2015] [Indexed: 11/30/2022]
Affiliation(s)
- S Das
- Department of Pathology, Institute of Post Graduate Medical Education & Research, Kolkata, West Bengal, India
| | - R Ghosh
- Department of Pathology, Institute of Post Graduate Medical Education & Research, Kolkata, West Bengal, India
| | - A Sen
- Department of Pathology, Nilratan Sarkar Medical College & Hospital, Kolkata, West Bengal, India
| | - R N Das
- Department of Pathology, Institute of Post Graduate Medical Education & Research, Kolkata, West Bengal, India
| | - K Saha
- Department of Pediatric Surgery, Nilratan Sarkar Medical College & Hospital, Kolkata, West Bengal, India
| | - U Chatterjee
- Department of Pathology, Institute of Post Graduate Medical Education & Research, Kolkata, West Bengal, India
| |
Collapse
|
11
|
Das S, Dalal BS, Mukhopadhyay D, Chatterjee U, Datta C, Chaudhuri MK. Fine needle aspiration cytology aided diagnosis of chordoma at an unusual site. Cytopathology 2016; 27:503-505. [PMID: 27018015 DOI: 10.1111/cyt.12326] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- S. Das
- Department of Pathology; IPGMER; Kolkata West Bengal India
| | - B. S. Dalal
- Department of Pathology; IPGMER; Kolkata West Bengal India
| | - D. Mukhopadhyay
- Department of Pathology; Bankura Sammilani Medical College; West Bengal India
| | - U. Chatterjee
- Department of Pathology; IPGMER; Kolkata West Bengal India
| | - C. Datta
- Department of Pathology; IPGMER; Kolkata West Bengal India
| | | |
Collapse
|
12
|
Affiliation(s)
- U. Chatterjee
- Department of Textile Technology; I.I.T; Delhi 110 016 India
| | - B. S. Butola
- Department of Textile Technology; I.I.T; Delhi 110 016 India
| | - M. Joshi
- Department of Textile Technology; I.I.T; Delhi 110 016 India
| |
Collapse
|
13
|
Chatterjee U, Zhao J, Iavarone M, Di Capua R, Castellan JP, Karapetrov G, Malliakas CD, Kanatzidis MG, Claus H, Ruff JPC, Weber F, van Wezel J, Campuzano JC, Osborn R, Randeria M, Trivedi N, Norman MR, Rosenkranz S. Emergence of coherence in the charge-density wave state of 2H-NbSe2. Nat Commun 2015; 6:6313. [PMID: 25687135 PMCID: PMC4339883 DOI: 10.1038/ncomms7313] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2014] [Accepted: 01/19/2015] [Indexed: 12/02/2022] Open
Abstract
A charge-density wave (CDW) state has a broken symmetry described by a complex order parameter with an amplitude and a phase. The conventional view, based on clean, weak-coupling systems, is that a finite amplitude and long-range phase coherence set in simultaneously at the CDW transition temperature Tcdw. Here we investigate, using photoemission, X-ray scattering and scanning tunnelling microscopy, the canonical CDW compound 2H-NbSe2 intercalated with Mn and Co, and show that the conventional view is untenable. We find that, either at high temperature or at large intercalation, CDW order becomes short-ranged with a well-defined amplitude, which has impacts on the electronic dispersion, giving rise to an energy gap. The phase transition at Tcdw marks the onset of long-range order with global phase coherence, leading to sharp electronic excitations. Our observations emphasize the importance of phase fluctuations in strongly coupled CDW systems and provide insights into the significance of phase incoherence in ‘pseudogap’ states. Charge density waves are described by a complex order parameter whose amplitude is expected to vanish at the transition temperature. This study shows that the transition in 2H-NbSe2 is driven by fluctuations of the phase of the order parameter, with a finite amplitude surviving in the disordered state.
Collapse
Affiliation(s)
- U Chatterjee
- 1] Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA [2] Department of Physics, University of Virginia, Charlottesville, Virginia 22904, USA
| | - J Zhao
- 1] Department of Physics, University of Virginia, Charlottesville, Virginia 22904, USA [2] Department of Physics, University of Illinois at Chicago, Chicago, Illinois 60607, USA
| | - M Iavarone
- Department of Physics, Temple University, Philadelphia, Pennsylvania 19122, USA
| | - R Di Capua
- Department of Physics, Temple University, Philadelphia, Pennsylvania 19122, USA
| | - J P Castellan
- 1] Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA [2] Institute of Solid State Physics, Karlsruhe Institute of Technology, PO Box 3640, D-76021 Karlsruhe, Germany
| | - G Karapetrov
- Department of Physics, Drexel University, Philadelphia, Pennsylvania 19104, USA
| | - C D Malliakas
- 1] Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA [2] Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA
| | - M G Kanatzidis
- 1] Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA [2] Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA
| | - H Claus
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - J P C Ruff
- 1] Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA [2] CHESS, Cornell University, Ithaca, New York 14853, USA
| | - F Weber
- 1] Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA [2] Institute of Solid State Physics, Karlsruhe Institute of Technology, PO Box 3640, D-76021 Karlsruhe, Germany
| | - J van Wezel
- 1] Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA [2] Institute for Theoretical Physics, University of Amsterdam, Tyndall Avenue, 1090 GL Amsterdam, The Netherlands
| | - J C Campuzano
- 1] Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA [2] Department of Physics, University of Illinois at Chicago, Chicago, Illinois 60607, USA
| | - R Osborn
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - M Randeria
- Department of Physics, Ohio State University, Columbus, Ohio 43210, USA
| | - N Trivedi
- Department of Physics, Ohio State University, Columbus, Ohio 43210, USA
| | - M R Norman
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - S Rosenkranz
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| |
Collapse
|
14
|
Nguyen V, Tan PK, Greenup AJ, Glass A, Davison S, Samarasinghe D, Holdaway S, Strasser SI, Chatterjee U, Jackson K, Locarnini SA, Levy MT. Anti-viral therapy for prevention of perinatal HBV transmission: extending therapy beyond birth does not protect against post-partum flare. Aliment Pharmacol Ther 2014; 39:1225-34. [PMID: 24666381 DOI: 10.1111/apt.12726] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/17/2013] [Revised: 01/03/2014] [Accepted: 03/04/2014] [Indexed: 12/12/2022]
Abstract
BACKGROUND Antepartum anti-viral therapy (AVT) is often administered to prevent perinatal transmission of hepatitis B virus (HBV) infection. Little is known about the effect of AVT on post-partum flare rates and severity. AIM To examine whether extending AVT beyond birth influences the post-partum course. METHODS One hundred and one pregnancies in 91 women with HBV DNA levels ≥log 7 IU/mL were included. AVT (initially lamivudine, later tenofovir disoproxil fumarate) was commenced from 32 weeks gestation and stopped soon after birth and at 12 weeks post-partum. Outcomes according to post-partum treatment duration were examined: Group 1 = AVT ≤4 weeks (n = 44), Group 2 = AVT >4 weeks (n = 43), Group 3 = no AVT (n = 14). RESULTS The majority of women were HBeAg+ (97%), median age 29 years, baseline HBV DNA log 8.0 IU/mL and follow-up 48 weeks post-partum. Post-partum treatment duration was 2 weeks for Group 1 and 12 weeks for Group 2, P < 0.01. Flare rates were not significantly different: Group 1 = 22/44 (50%), Group 2 = 17/43 (40%) and Group 3 = 4/14 (29%), P = 0.32. Onset of flare was similar at 8/10/9 weeks post-partum for Groups 1/2/3 respectively, P = 0.34. The majority of flares spontaneously resolved. HBeAg seroconversion (n = 1/5/1 in Groups 1/2/3, P = 0.27) was not associated with treatment duration or the occurrence of a post-partum flare. CONCLUSIONS Post-partum flares are common and usually arise early after delivery. They are often mild in severity and most spontaneously resolve. Extending anti-viral therapy does not protect against post-partum flares or affect HBeAg seroconversion rates.
Collapse
Affiliation(s)
- V Nguyen
- Liverpool Hospital, Sydney, NSW, Australia
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
15
|
Dutta D, Shivaprasad KS, Das RN, Ghosh S, Chatterjee U, Chowdhury S, Dasgupta R. Ovotesticular disorder of sexual development due to 47,XYY/46,XY/45,X mixed gonadal dysgenesis in a phenotypic male presenting as cyclical haematuria: clinical presentation and assessment of long-term outcomes. Andrologia 2012; 46:191-3. [PMID: 23163819 DOI: 10.1111/and.12048] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/03/2012] [Indexed: 11/25/2022] Open
Abstract
Ovotesticular disorder of sexual differentiation (OTDSD) is a rare cause of disorder of sexual differentiation predominantly having 46,XX karyotype, female phenotype and ambiguous genitalia. We report a 15-year-old having male body habitus, axillary and pubic hair, well-developed penis and right-descended testis with history of penoscrotal hypospadias correction, presenting with three episodes of cyclical haematuria, who biochemically had normal serum testosterone (338 ng dl(-1) ) which increased following hCG stimulation (614 ng dl(-1) ), elevated estradiol (17.35 pg ml(-1) ) along with elevated luteinising hormone (11.3 mIU l(-1) ) and follicle-stimulating hormone (31 mIU l(-1) ). Ultrasonography followed by micturating cystourethrogram and cystoscopy confirmed the presence of prostate, uterus, cervix and vagina draining into the urogenital sinus continuing till the penile urethra and left intra-abdominal gonad. Patient underwent hysterectomy and left gonadectomy. Histopathologic study of resected gonad confirmed presence of ovotestis. Low estradiol (1.2 pg ml(-1) ) following gonadectomy confirmed the ovotestis origin of estradiol. Chromosomal analysis revealed complex karyotype predominant being 47,XYY (50%) followed by 46,XY (26%) and 45,X (24%). This is perhaps the first report of 47,XYY/46,XY/45,X causing OTDSD in a phenotypic male.
Collapse
Affiliation(s)
- D Dutta
- Department of Endocrinology & Metabolism, IPGMER & SSKM Hospital, Kolkata, India
| | | | | | | | | | | | | |
Collapse
|
16
|
Mondal G, Chatterjee U, Chawla YK, Chatterjee BP. Alterations of glycan branching and differential expression of sialic acid on alpha fetoprotein among hepatitis patients. Glycoconj J 2010; 28:1-9. [PMID: 21161373 DOI: 10.1007/s10719-010-9316-z] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2010] [Revised: 10/12/2010] [Accepted: 11/24/2010] [Indexed: 01/27/2023]
Abstract
The level of serum glycoproteins and their glycosylation pattern change in liver diseases including hepatocellular carcinoma (HCC). Some of them, especially alpha fetoprotein (AFP), serve as useful biomarkers for HCC. The present investigation showed high level of AFP in hepatitis B cirrhosis (HBV-LC) and hepatitis C cirrhosis (HCV-LC) patients. However, increase of AFP level was not significantly high in chronic hepatitis B (HBV-CH) as determined by ELISA using monoclonal anti-human AFP (mAb-AFP). The differential expression of sialic acid linkage was observed in HBV-CH and HCV-LC by ELISA; the former bound strongly with Sambucus nigra agglutinin (SNA), which has exclusive binding specificity for NeuAcα2-6-, whereas HCV-LC reacted preferably with Maackia amurensis agglutinin (MAA) which recognizes NeuAcα2-3-. There was significantly high glycan branching in HBV-LC and HCV-LC in comparison to controls as illustrated by concanavalin A. This was further confirmed by Phaseolus vulgaris erythroagglutinin (E-PHA) and Datura stramonium agglutinin (DSA). Enhanced fucosylation of AFP was observed in HBV-LC, HCV-LC and HCC patients by ELISA using fucose binding Aleuria aurantia lectin; however, maximum binding was found in HCC. Fucosylation with α1-6 linkage was further confirmed by Lens culinaris agglutinin (LCA). From the above results it is concluded that the changes in concentration of AFP, differential expression of sialic acid, increase of glycan branching and fucosylation have a prognostic value of hepatitis and it could be possible that lectin-based assay with AFP can aid in diagnosis of hepatitis diseases besides clinical examination and routine laboratory investigation.
Collapse
Affiliation(s)
- Gautam Mondal
- Department of School of Management and Science, West Bengal University of Technology, Salt lake, Kolkata, 700064, India
| | | | | | | |
Collapse
|
17
|
|
18
|
Pratim Bose P, Chatterjee U, Xie L, Johansson J, Göthelid E, Arvidsson PI. Effects of Congo red on aβ(1-40) fibril formation process and morphology. ACS Chem Neurosci 2010; 1:315-24. [PMID: 22778828 DOI: 10.1021/cn900041x] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2009] [Accepted: 01/22/2010] [Indexed: 01/04/2023] Open
Abstract
Alzheimer's disease (AD), an age-related neurodegenerative disorder, is the most common form of dementia, and the seventh-leading cause of death in the United States. Current treatments offer only symptomatic relief; thus, there is a great need for new treatments with disease-modifying potential. One pathological hallmark of AD is so-called senile plaques, mainly made up of β-sheet-rich assemblies of 40- or 42-residue amyloid β-peptides (Aβ). Hence, inhibition of Aβ aggregation is actively explored as an option to prevent or treat AD. Congo red (CR) has been widely used as a model antiamyloid agent to prevent Aβ aggregation. Herein, we report detailed morphological studies on the effect of CR as an antiamyloid agent, by circular dichroism spectroscopy, photo-induced cross-linking reactions, and atomic force microscopy. We also demonstrate the effect of CR on a preaggregated sample of Aβ(1-40). Our result suggests that Aβ(1-40) follows a different path for aggregation in the presence of CR.
Collapse
Affiliation(s)
- Partha Pratim Bose
- Department of Biochemistry and Organic Chemistry, Uppsala University, Box 576, S-75123 Uppsala, Sweden
| | - Urmimala Chatterjee
- Department of Anatomy, Physiology and Biochemistry, Swedish University of Agricultural Sciences, The Biomedical Center, Box 575, S-75123 Uppsala, Sweden
| | - Ling Xie
- Department of Physics and Materials Science, Uppsala University, Box 530, 751 21 Uppsala, Sweden
| | - Jan Johansson
- Department of Anatomy, Physiology and Biochemistry, Swedish University of Agricultural Sciences, The Biomedical Center, Box 575, S-75123 Uppsala, Sweden
| | - Emmanuelle Göthelid
- Department of Physics and Materials Science, Uppsala University, Box 530, 751 21 Uppsala, Sweden
| | - Per I Arvidsson
- Department of Biochemistry and Organic Chemistry, Uppsala University, Box 576, S-75123 Uppsala, Sweden
- Discovery CNS & Pain Control, AstraZeneca R&D Södertälje, S-151 85 Södertälje, Sweden
| |
Collapse
|
19
|
Pratim Bose P, Chatterjee U, Nerelius C, Govender T, Norström T, Gogoll A, Sandegren A, Göthelid E, Johansson J, Arvidsson PI. Poly-N-methylated amyloid beta-peptide (Abeta) C-terminal fragments reduce Abeta toxicity in vitro and in Drosophila melanogaster. J Med Chem 2010; 52:8002-9. [PMID: 19908889 DOI: 10.1021/jm901092h] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Alzheimer's disease (AD), an age related neurodegenerative disorder, threatens to become a major health-economic problem. Assembly of 40- or 42-residue amyloid beta-peptides (Abeta) into neurotoxic oligo-/polymeric beta-sheet structures is an important pathogenic feature in AD, thus, inhibition of this process has been explored to prevent or treat AD. The C-terminal part plays an important role in Abeta aggregation, but most Abeta aggregation inhibitors have targeted the central region around residues 16-23. Herein, we synthesized hexapeptides with varying extents of N-methylation based on residues 32-37 of Abeta, to target its C-terminal region. We measured the peptides' abilities to retard beta-sheet and fibril formation of Abeta and to reduce Abeta neurotoxicity. A penta-N-methylated peptide was more efficient than peptides with 0, 2, or 3 N-methyl groups. This penta-N-methylated peptide moreover increased life span and locomotor activity in Drosophila melanogaster flies overexpressing human Abeta(1-42).
Collapse
Affiliation(s)
- Partha Pratim Bose
- Department of Biochemistry and Organic Chemistry, Uppsala University, Uppsala, Sweden
| | | | | | | | | | | | | | | | | | | |
Collapse
|
20
|
Chattopadhyay M, Kumbhakar P, Tiwary CS, Mitra AK, Chatterjee U, Kobayashi T. Three-photon-induced four-photon absorption and nonlinear refraction in ZnO quantum dots. Opt Lett 2009; 34:3644-3646. [PMID: 19953148 DOI: 10.1364/ol.34.003644] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Three-photon-induced four-photon absorption via excited-state absorption and self-defocusing nonlinear refraction are reported for the first time, to our knowledge, in ZnO quantum dots with average sizes of 2.0+/-0.1 nm with 1064 nm radiation from a Q-switched Nd:YAG laser at a peak intensity of 2.5 GW/cm(2). By employing the three-level two-step model, the experimental results can be explained quite satisfactorily.
Collapse
Affiliation(s)
- M Chattopadhyay
- 1Department of Physics, National Institute of Technology, Durgapur 713209, India
| | | | | | | | | | | |
Collapse
|
21
|
Kanigel A, Chatterjee U, Randeria M, Norman MR, Koren G, Kadowaki K, Campuzano JC. Evidence for pairing above the transition temperature of cuprate superconductors from the electronic dispersion in the pseudogap phase. Phys Rev Lett 2008; 101:137002. [PMID: 18851483 DOI: 10.1103/physrevlett.101.137002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2008] [Indexed: 05/26/2023]
Abstract
In the underdoped high temperature superconductors, instead of a complete Fermi surface above Tc, only disconnected Fermi arcs appear, separated by regions that still exhibit an energy gap. We show that in this pseudogap phase, the energy-momentum relation of electronic excitations near EF behaves like the dispersion of a normal metal on the Fermi arcs, but like that of a superconductor in the gapped regions. We argue that this dichotomy in the dispersion is difficult to reconcile with a competing order parameter, but is consistent with pairing without condensation.
Collapse
Affiliation(s)
- A Kanigel
- Department of Physics, University of Illinois at Chicago, Chicago, Illinois 60607, USA
| | | | | | | | | | | | | |
Collapse
|
22
|
Bhattacharyya NK, Chatterjee U, Sarkar S, Kundu AK. A study of proliferative activity, angiogenesis and nuclear grading in renal cell carcinoma. INDIAN J PATHOL MICR 2008; 51:17-21. [DOI: 10.4103/0377-4929.40384] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
|
23
|
Kanigel A, Chatterjee U, Randeria M, Norman MR, Souma S, Shi M, Li ZZ, Raffy H, Campuzano JC. Protected nodes and the collapse of Fermi arcs in high-T{c} cuprate superconductors. Phys Rev Lett 2007; 99:157001. [PMID: 17995204 DOI: 10.1103/physrevlett.99.157001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2007] [Indexed: 05/25/2023]
Abstract
Angle resolved photoemission on underdoped Bi2Sr2CaCu2O8 reveals that the magnitude and d-wave anisotropy of the superconducting state energy gap are independent of temperature all the way up to T{c}. This lack of T variation of the entire k-dependent gap is in marked contrast to mean field theory. At T{c} the point nodes of the d-wave gap abruptly expand into finite length "Fermi arcs." This change occurs within the width of the resistive transition, and thus the Fermi arcs are not simply thermally broadened nodes but rather a unique signature of the pseudogap phase.
Collapse
Affiliation(s)
- A Kanigel
- Department of Physics, University of Illinois at Chicago, Chicago, Illinois 60607, USA
| | | | | | | | | | | | | | | | | |
Collapse
|
24
|
Mondal G, Chatterjee U, Samanta S, Chatterjee BP. Role of pepsin in modifying the allergenicity of bhetki (Lates calcarifer) and mackerel (Rastrelliger kanagurta) fish. Indian J Biochem Biophys 2007; 44:94-100. [PMID: 17536337] [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: 05/15/2023]
Abstract
The effect of pepsin digestion on the allergenicity of raw and thermally processed (boiled and fried) fish muscle extracts of two widely consumed fishes bhetki (Lates calcarifer) and mackerel (Rastrelliger kanagurta) was studied. Sere were collected from 110 patients who were hypersensitive to fish, as evidenced by their clinical history, symptoms and positive skin-prick test results. The various extracts after digestion with pepsin at different times of incubation were tested for specific IgE-binding activity by ELISA and immunoblotting with patients' sera. All the extracts of both the fishes retained their allergenicity as evidenced by ELISA and immunoblotting. In bhetki, maximum allergenicity was found in the pepsin-digested fried extract, whereas similar treatment decreased the allergenicity in fried mackerel. Results showed that raw as well as thermally processed allergens of both the fishes maintained strong allergenicity, even after digestion with pepsin for different time periods. The study revealed that the fish proteins played an important role in manifestation of allergy, due to their stable structure, which was retained even after pepsin and heat treatment.
Collapse
Affiliation(s)
- Gautam Mondal
- Department of Biological Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India
| | | | | | | |
Collapse
|
25
|
Saja K, Chatterjee U, Chatterjee BP, Sudhakaran PR. Activation dependent expression of MMPs in peripheral blood mononuclear cells involves protein kinase A. Mol Cell Biochem 2006; 296:185-92. [PMID: 17043752 DOI: 10.1007/s11010-006-9314-4] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2006] [Accepted: 08/25/2006] [Indexed: 10/24/2022]
Abstract
Monocyte/Macrophages are integral cellular components of inflammation. Matrix metalloproteinases (MMPs) produced by these cells play a crucial role in every aspect of inflammation. Results of the investigations on activation dependent upregulation of MMPs in human peripheral blood mononuclear cells in culture using different lectins as an in vitro model system to mimic inflammatory monocytes are presented. Under normal physiological conditions the monocytes produced only very low amount of MMPs in an indomethacin insensitive PG/cAMP independent manner. Zymographic analysis and ELISA showed that treatment of monocyte with lectins like concanavalin A (ConA), wheat germ agglutinin (WGA) and Artocarpus lakoocha agglutinin (ALA) caused upregulation of MMPs and the maximum effect was produced by ALA. ALA significantly upregulated MMP-9 in a concentration and time dependent manner. Immunoblot analysis and RT-PCR confirmed ALA mediated upregulation of MMP-9 production. Inhibition of ALA effect by indomethacin and reversal of the indomethacin effect by Bt(2)cAMP indicated involvement of cAMP dependent signaling pathway. Further support for the prostaglandin mediated effect was obtained by the upregulation of cyclooxygenase by ALA. H-89, an inhibitor of protein kinase A (PKA), inhibited the expression of MMP-9 indicating that ALA mediated upregulation of MMP-9 is mediated through PKA pathway. Increase in MMP production and increase in cyclooxygenase activity and inhibition of the effect of ALA on MMP production by indomethacin suggested that the ALA activated monocytes in culture can be used as an in vitro model system to study the intracellular signaling process involved in the mediation of inflammatory response.
Collapse
Affiliation(s)
- K Saja
- Department of Biochemistry, University of Kerala, Kariavattom, Thiruvananthapuram, 695 581, Kerala, India
| | | | | | | |
Collapse
|
26
|
Chatterjee U, Mondal G, Chakraborti P, Patra HK, Chatterjee BP. Changes in the Allergenicity during Different Preparations of Pomfret, Hilsa, Bhetki and Mackerel Fish as Illustrated by Enzyme-Linked Immunosorbent Assay and Immunoblotting. Int Arch Allergy Immunol 2006; 141:1-10. [PMID: 16804323 DOI: 10.1159/000094176] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2005] [Accepted: 02/21/2006] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Although the identification and characterization of several fish allergens have already been reported, there is almost no data on Indian fish allergens and the effect of thermal processing on their allergenicity. This study aimed at the evaluation of the changes in the level of allergenicity of 4 highly consumed Indian fishes, i.e. pomfret, hilsa, bhetki and mackerel, that occurred after boiling and frying. METHODS In this study 110 patients with fish hypersensitivity as evidenced by clinical history and symptoms were recruited based on their positive skin prick test results. The raw, boiled and fried muscle extracts of the 4 fishes were prepared, and each extract was tested by ELISA and immunoblotting with patients' sera. RESULTS ELISA and immunoblotting studies demonstrated that the raw muscle extracts of pomfret, hilsa, bhetki and mackerel were allergenic. While the allergenicity of boiled and fried extracts of pomfret and hilsa was considerably reduced, maximum allergenicity of bhetki was demonstrated in the fried extract. The degree of allergenicity of bhetki was demonstrated in the order fried>boiled>raw while that of mackerel followed the order raw>boiled approximately fried. CONCLUSION The specific IgE-binding activity and immunoblot profile clearly showed that pomfret and hilsa fish allergens are heat-labile, while allergens of bhetki and mackerel maintained strong reactivity even after thermal treatment.
Collapse
Affiliation(s)
- U Chatterjee
- Department of Biological Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata, India
| | | | | | | | | |
Collapse
|
27
|
Chatterjee U, Shi M, Kaminski A, Kanigel A, Fretwell HM, Terashima K, Takahashi T, Rosenkranz S, Li ZZ, Raffy H, Santander-Syro A, Kadowaki K, Norman MR, Randeria M, Campuzano JC. Nondispersive fermi arcs and the absence of charge ordering in the pseudogap phase of Bi2Sr2CaCu2O8+delta. Phys Rev Lett 2006; 96:107006. [PMID: 16605781 DOI: 10.1103/physrevlett.96.107006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2005] [Indexed: 05/08/2023]
Abstract
The autocorrelation of angle resolved photoemission data from the high temperature superconductor Bi(2)Sr(2)CaCu(2)O(8+delta) shows distinct peaks in momentum space which disperse with binding energy in the superconducting state, but not in the pseudogap phase. Although it is tempting to attribute a nondispersive behavior in momentum space to charge ordering, a deconstruction of the autocorrelation reveals that the nondispersive peaks arise from the tips of the Fermi arcs, which themselves do not change with binding energy.
Collapse
Affiliation(s)
- U Chatterjee
- Department of Physics, University of Illinois at Chicago, 60607, USA
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
28
|
Das A, Chakraborti P, Chatterjee U, Monddal G, Chatterjee BP. Identification of allergens in Indian fishes: hilsa and pomfret exemplified by ELISA and immunoblotting. Indian J Exp Biol 2005; 43:1170-5. [PMID: 16359130] [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: 05/05/2023]
Abstract
Enzymed-linked immunosorbent assay of hilsa and pomfret muscle extracts showed specific IgE binding to ten allergic patients' sera, the results corroborated to that of skin prick test. Comparison of allergen profiles of the two fish extracts by immunoblotting revealed a common antigenic protein of 50 kDa and some high molecular weight fish allergens instead of low molecular weight parvalbumin found in several fishes. Purified and well characterized fish allergens are always considered better than crude fish extracts for diagnostic use.
Collapse
Affiliation(s)
- Arpita Das
- Department of Biological Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India
| | | | | | | | | |
Collapse
|
29
|
Singh T, Chatterjee U, Wu JH, Chatterjee BP, Wu AM. Carbohydrate recognition factors of a T (Gal 1->3GalNAc 1->Ser/Thr) and Tn (GalNAc 1->Ser/Thr) specific lectin isolated from the seeds of Artocarpus lakoocha. Glycobiology 2004; 15:67-78. [PMID: 15329360 DOI: 10.1093/glycob/cwh144] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [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: 11/13/2022] Open
Abstract
Artocarpus lakoocha agglutinin (ALA), isolated from the seeds of A. lakoocha fruit, is a galactose-binding lectin and a potent mitogen of T and B cells. Knowledge obtained from previous studies on the affinity of ALA was limited to molecular and submolecular levels of Galbeta1-->3GalNAc (T) and its derivatives. In the present study, the carbohydrate specificity of ALA was characterized at the macromolecular level according to the mammalian Gal/GalNAc structural units and corresponding glycoconjugates by an enzyme-linked lectinosorbent (ELLSA) and inhibition assays. The results indicate that ALA binds specifically to tumor-associated carbohydrate antigens GalNAcalpha1-->Ser/Thr (Tn) and Galbeta1-->3 GalNAcalpha1-->Ser/Thr (Talpha). It barely cross-reacts with other common glycotopes on glycoproteins, including ABH blood group antigens, Galbeta1-->3/4GlcNAc (I/II) determinants, T/Tn covered by sialic acids, and N-linked plasma glycoproteins. Dense clustering structure of Tn/Talpha-containing glycoproteins tested resulted in 2.4 x 10(5)-6.7 x 10(5)-fold higher affinities to ALA than the respective GalNAc and Gal monomer. According to our results, the overall affinity of ALA for glycans can be ranked respectively: polyvalent Tn/Talpha glycotopes >> monomeric Talpha and simple clustered Tn >> monomeric Tn > GalNAc > Gal; while other glycotopes: Galalpha1-->3/4Gal (B/E), Galbeta1-->3/4GlcNAc (I/II), GalNAcalpha1-->3Gal/GalNAc (A/F), and GalNAcbeta1-->3/4Gal (P/S) were inactive. The strong specificity of ALA for Tn/Talpha cluster suggests the importance of glycotope polyvalency during carbohydrate-receptor interactions and emphasizes its value as an anti-Tn/T lectin for analysis of glycoconjugate mixtures or transformed carbohydrates.
Collapse
Affiliation(s)
- Tanuja Singh
- Glyco-Immunochemistry Research Laboratory, Institute of Molecular and Cellular Biology, Chang-Gung University, Kwei-san, Tao-yuan, 333, Taiwan
| | | | | | | | | |
Collapse
|
30
|
Bandyopadhyay SK, Bandyopadhyay R, Chatterjee U. Isolated gastric tuberculosis presenting as haematemesis. J Postgrad Med 2002; 48:72-3. [PMID: 12082338] [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: 02/25/2023] Open
|
31
|
Konar K, Chatterjee U, Dutta SK. An evaluation of ductal carcinoma in-situ of breast and its correlation with the grade of associated invasive component. INDIAN J PATHOL MICR 2001; 44:297-300. [PMID: 12024916] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/25/2023] Open
Abstract
Twenty-five cases of Ductal carcinoma in situ(DCIS), of breast with an associated invasive component were selected for this study. The aim was to identify the percentage of malignant cases having DCIS component, to analyse the distribution of DCIS according to architecture and cytonuclear grading and evaluate the correlation between grade of DCIS with that of associated invasive component. The DCIS component was classified according to traditional architectural classification and Van-Nuys cytonuclear classification. The grading of the invasive component was done according to Nottingham's modification of Bloom-Richardson system. Architecturally 72% of DCIS components were of pure form, 28% were of mixed pattern. According to cytonuclear grading 24% cases had grade-I, 28% grade-II and 48% grade-III DCIS. The invasive component showed 16% cases in grade-III. After correlating the grade of DCIS and invasive component 91% positive correlation was found in grade-III cases followed by 66.6% in grade-I and 57.1% in grade-II cases.
Collapse
Affiliation(s)
- K Konar
- Department of Pathology, Burdwan Medical College, Calcutta
| | | | | |
Collapse
|
32
|
Ramachandran A, Jain A, Arora P, Bashyam MD, Chatterjee U, Ghosh S, Parnaik VK, Hasnain SE. Novel Sp family-like transcription factors are present in adult insect cells and are involved in transcription from the polyhedrin gene initiator promoter. J Biol Chem 2001; 276:23440-9. [PMID: 11294840 DOI: 10.1074/jbc.m101537200] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [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: 11/06/2022] Open
Abstract
We earlier documented the involvement of a cellular factor, polyhedrin (polh) promoter-binding protein, in transcription from the Autographa californica nuclear polyhedrosis virus polh gene promoter. Sequences upstream of the polh promoter were found to influence polh promoter-driven transcription. Analysis of one such region, which could partially compensate for the mutated polh promoter and also activate transcription from the wild-type promoter, revealed a sequence (AcSp) containing a CACCC motif and a loose GC box resembling the binding motifs of the transcription factor Sp1. AcSp and the consensus Sp1 sequence (cSp) specifically bound factor(s) in HeLa and Spodoptera frugiperda (Sf9) insect cell nuclear extracts to generate identical binding patterns, indicating the similar nature of the factor(s) interacting with these sequences. The AcSp and cSp oligonucleotides enhanced in vivo expression of a polh promoter-driven luciferase gene. In vivo mopping of these factor(s) significantly reduced transcription from the polh promoter. Recombinant viruses carrying deletions in the upstream AcSp sequence confirmed the requirement of these factor(s) in polh promoter-driven transcription in the viral context. We demonstrate for the first time DNA-protein interactions involving novel members of the Sp family of proteins in adult insect cells and their involvement in transcription from the polh promoter.
Collapse
Affiliation(s)
- A Ramachandran
- Eukaryotic Gene Expression Laboratory, National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi 110067, India
| | | | | | | | | | | | | | | |
Collapse
|
33
|
Abstract
This paper examines seasonal variation of births in a rural community of West Bengal, India, by exploring data from the 1992-93 National Family Health Survey. Suitable time series analyses were used to determine the seasonal pattern of births and to estimate peaks. The trigonometric regression technique was used to carry out this objective. The study attempted to link the results of the regression analysis to the atmospheric temperature of the region during 1987-91, the distribution of respondents' husbands' occupations and the marriage pattern of the community. It was found that, in the study population, conceptions were numerous in the first quarter of a calendar year and the distribution of conceptions over calendar months was negatively associated with the average monthly temperature. In addition, the marriage pattern of the community and the occupational distribution of the fathers also had a significant effect on the distribution of births over calendar months. It is hoped that the findings will boost the development of needs-based maternal and child health (MCH) and family planning programmes in the community.
Collapse
Affiliation(s)
- U Chatterjee
- International Institute for Population Sciences, Deonar, Mumbai, India
| | | |
Collapse
|
34
|
Sudhakar A, Krishnamoorthy T, Jain A, Chatterjee U, Hasnain SE, Kaufman RJ, Ramaiah KV. Serine 48 in initiation factor 2 alpha (eIF2 alpha) is required for high-affinity interaction between eIF2 alpha(P) and eIF2B. Biochemistry 1999; 38:15398-405. [PMID: 10563826 DOI: 10.1021/bi991211n] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [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: 11/28/2022]
Abstract
Phosphorylation of the serine 51 residue in the alpha-subunit of translational initiation factor 2 in eukaryotes (eIF2 alpha) impairs protein synthesis presumably by sequestering eIF2B, a rate-limiting pentameric guanine nucleotide exchange protein which catalyzes the exchange of GTP for GDP in the eIF2-GDP binary complex. To further understand the importance of eIF2 alpha phosphorylation in the interaction between eIF2 alpha(P) and eIF2B proteins and thereby the regulation of eIF2B activity, we expressed the wild type (wt) and a mutant eIF2 alpha in which the serine 48 residue was replaced with alanine (48A mutant) in the baculovirus system. The findings reveal that the expression of both of these recombinant subunits was very efficient (15-20% of the total protein) and both proteins were recognized by an eIF2 alpha monoclonal antibody and were phosphorylated to the same extent by reticulocyte eIF2 alpha kinases. However, partially purified recombinant subunits (wt or 48A mutant) were not phosphorylated as efficiently as the eIF2 alpha subunit present in the purified reticulocyte trimeric eIF2 complex and were also found to inhibit the phosphorylation of eIF2 alpha of the trimeric complex. Furthermore, the extents of inhibition of eIF2B activity and formation of the eIF2 alpha(P)-eIF2B complex that occurs due to eIF2 alpha phosphorylation in poly(IC)-treated rabbit reticulocyte lysates were decreased significantly in the presence of insect cell extracts expressing the 48A mutant eIF2 alpha compared to those for wt. These findings support the hypothesis that the serine 48 residue is required for high-affinity interaction between eIF2 alpha(P) and eIF2B.
Collapse
Affiliation(s)
- A Sudhakar
- Department of Biochemistry, University of Hyderabad, Andhra Pradesh, India
| | | | | | | | | | | | | |
Collapse
|
35
|
Ghoshal UC, Ghosh TK, Chatterjee U, Mukherjee S, Das P, Ghoshal U, Santra A, Banerjee P, De BK, Mazumder DN. Role of Helicobacter pylori in peptic ulcer in patients with hepatic cirrhosis. Indian J Gastroenterol 1999; 18:90. [PMID: 10319546] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
|
36
|
Bhar GC, Kumbhakar P, Chatterjee U, Rudra AM, Kuwano Y, Kouta H. Efficient Generation of 200-230-nm Radiation in Beta Barium Borate by Noncollinear Sum-Frequency Mixing. Appl Opt 1998; 37:7827-7831. [PMID: 18301625 DOI: 10.1364/ao.37.007827] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Tunable ultraviolet radiation in the 200-230-nm region has been generated with beta barium borate crystals by type I sum-frequency mixing of the second harmonic with the fundamental beam from a dye laser pumped by the second harmonic of the same Nd:YAG laser. A noncollinear phase-matching configuration has made it possible to realize conversion efficiency of 21% at 208.3 nm with input power densities as low as 28 MW/cm(2) for the fundamental and 2.4 MW/cm(2) for its second-harmonic radiation. The absorption characteristic of a standard DNA sample has been studied with the generated tunable ultraviolet source, revealing additional features compared with those obtained with a spectrophotometer.
Collapse
|
37
|
Saha KB, Chatterjee U. Reproductive rights in contraceptive practices. Health Millions 1998; 24:31-2. [PMID: 12348879] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
|
38
|
Krishnamurthy S, Chatterjee U, Gupta V, Prasad R, Das P, Snehlata P, Hasnain SE, Prasad R. Deletion of transmembrane domain 12 of CDR1, a multidrug transporter from Candida albicans, leads to altered drug specificity: expression of a yeast multidrug transporter in baculovirus expression system. Yeast 1998; 14:535-50. [PMID: 9605504 DOI: 10.1002/(sici)1097-0061(19980430)14:6<535::aid-yea254>3.0.co;2-5] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.2] [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: 11/10/2022] Open
Abstract
Cdr1p, an ATP-binding cassette transporter from the pathogenic yeast Candida albicans, confers resistance to several unrelated drugs including anti-Candida drugs (Prasad et al., 1995b). We demonstrate that the deletion of 237 bp (79 aa) from the 3' end of CDR1 (which encompasses the transmembrane domain (TM) 12 of the putative transporter) did not result in the total loss of its ability to efflux cytotoxic agents. While the expression of deltaCDR1 in yeast resulted in impaired sensitivity to drugs like cycloheximide, anisomycin, sulfomethuron methyl and antifungal nystatin, its ability to confer resistance remained unaltered to drugs such as o-phenanthroline, 4-nitroquinoline-N-oxide, cerulenin, azoles, oligomycin, erythromycin, and benomyl. Similar to human MDR1p. Cdr1p might also have localized drug binding sites in TM 12, but that might not be the case for all the drugs. The TM 12 deletion also did not lead to any significant impairment in NTPase activities. Both ATPase and UTPase activities of complete Cdr1p and deltaCdr1p were not significantly altered, as was the case with respect to their ability to efflux Rh123 and steroid hormone like [3H]-beta-estradiol. To further dissect the functionality of Cdr1p, its truncated version was overexpressed in a baculovirus-insect cell expression system. The synthesis of deltaCdr1p in Sf9 cells was temporally regulated as a function of the baculovirus polyhedrin gene promoter. The Sf9 derived deltaCdr1p was approximately 130 kDa, which was lower than the expected size, probably due to the differences in glycosylation. This, however, did not affect the functionality of deltaCdr1p. The deletion of TM 12 did not affect the targeting of the protein and deltaCdr1p was exclusively localized in plasma membrane of Sf9 cells as detected by immunofluorescence. The expression of deltaCdr1p in the baculovirus-insect expression system generated a high drug-stimulated plasma membrane-bound ATPase activity which was not demonstrable when deltaCdr1p was expressed in yeast.
Collapse
Affiliation(s)
- S Krishnamurthy
- Membrane Biology Laboratory, School of Life Sciences, Jawaharlal Nehru University, New Delhi, India
| | | | | | | | | | | | | | | |
Collapse
|
39
|
Bhar GC, Chatterjee U, Rudra AM, Kumbhakar P, Route RK, Feigelson RS. Generation of tunable 187.9-196-nm radiation in beta-BaB(2)O(4): errata. Opt Lett 1998; 23:310. [PMID: 18084495 DOI: 10.1364/ol.23.000310] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
In Ref. 1, the first full sentence in the right-hand column of p. 1608 should read as: 'Although BBO is phase matchable down to 187 nm and shorter in this configuration without a very large (2-4 degrees ) change in theta (and hence in d(eff)), and B2 is also suitable to accommodate the phase matching, tunability below 187.9 nm becomes limited by the exponential increase in crystal absorption.'
Collapse
|
40
|
Bhar GC, Chatterjee U, Rudra AM, Kumbhakar P, Route RK, Feigelson RS. Generation of tunable 187.9-196-nm radiation in beta-Ba(2)BO(4). Opt Lett 1997; 22:1606-1608. [PMID: 18188311 DOI: 10.1364/ol.22.001606] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Tunable 187.9-196-nm vacuum-ultraviolet radiation was generated at room temperature in a beta barium borate crystal by sum-frequency mixing of Nd:YAG laser radiation and the second harmonic of a dye laser pumped by the second harmonic of the same Nd:YAG laser. By use of the advantageous noncollinear phase-matching configuration, a peak power of 1.3 kW was obtained at 194 nm with input power densities as low as 79MW/cm(2) for 1064-nm and 0.65MW/cm(2) for 237.3-nm radiation.
Collapse
|
41
|
Chatterjee U, Chauhan HO, Sanwal GG. Physico-chemical and functional characterization of a high molecular weight carboxymethylcellulase from Cuscuta reflexa. Indian J Biochem Biophys 1997; 34:354-64. [PMID: 9491645] [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: 02/06/2023]
Abstract
Carboxymethylcellulase (CMCase) was extracted and purified from an angiosperm parasite Cuscuta reflexa free from beta-glucosidase and other enzyme activities. The molecular mass and Stokes' radius of the purified enzyme are 144 kDa and 44 A, respectively. The diffusion coefficient and frictional ratio of the enzyme were 5.15 x 10(-7) cm2/sec and 1.27. The SDS-PAGE revealed homotetrameric nature of the enzyme with a subunit molecular mass of 35 +/- 1 kDa. Titration against DTNB and NBS revealed 19 sulfhydryl groups and 8 tryptophan groups, respectively, per mole of the enzyme. A sharp pH optimum at 5.0 was obtained. Cuscuta CMCase activity is unique amongst plant endoglucanases in being stimulated by Mg2+ and Mn2+ ions and by various thiols. Reaction product analysis, mode of enzyme action and substrate specificity test suggest the endo- nature of the purified CMCase. The enzyme showed K(m) value of 26 +/- 1 mg/ml for carboxymethylcellulose (sodium salt).
Collapse
Affiliation(s)
- U Chatterjee
- Department of Biochemistry, Lucknow University, India
| | | | | |
Collapse
|
42
|
Abstract
Catalase plays a major role in the protection of tissues from toxic effects of H2O2 and partially reduced oxygen species. In the present study catalase was extracted and purified 330-fold from goat lung by acetone fractionation and successive chromatographies on DEAE-cellulose, Sephadex G-200, Blue Sepharose CL-6B and Ultrogel AcA-34. The purified enzyme was almost homogeneous as judged by polyacrylamide gel electrophoresis and FPLC. The molecular weight and Stokes' radius of the purified enzyme were 339 kDa and 127 +/- 2 A. The enzyme had 11 sulfhydryl groups and 15 tryptophan groups per mol of the enzyme. A broad pH optimum in the range 5.2 to 7.8 was obtained. Sulfhydryl group binding agents, thiol reagents and N-Bromosuccinimide inhibited the enzyme activity. The kinetic data show no cooperativity between the substrate binding sites. Tryptophan, indole acetic acid, cysteine, formaldehyde and sodium azide inhibited the enzyme non-competitively with Ki values of 1.5, 1.6, 6.7, 0.55 and 0.0017 mM, respectively.
Collapse
Affiliation(s)
- U Chatterjee
- Department of Biochemistry, Lucknow University, India
| | | |
Collapse
|
43
|
Chatterjee U, Kumar A, Sanwal GG. Purification and properties of goat liver catalase: two pH optima. Indian J Biochem Biophys 1989; 26:140-7. [PMID: 2620909] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Goat liver catalase (EC 1.11.1.6) has been purified to homogeneity using the techniques of ammonium sulfate fractionation, DEAE-cellulose chromatography and gel-filtration through Ultrogel AcA-34 involving two alternating steps of column chromatography. The homogeneity of the purified enzyme was tested by native and sodium dodecyl sulfate polyacrylamide gel electrophoresis, immunodiffusion and immunoelectrophoresis. The enzyme is a tetramer having a subunit molecular weight of 58,000 +/- 3000, contains six sulfhydryl groups per mole of the enzyme and shows pH optima at pH 6.8 and 7.7. The kinetic data show no cooperativity between the substrate binding sites. Tryptophan, indoleacetic acid, cysteine, formaldehyde and sodium azide inhibit the enzyme non-competitively with Ki values of 4 +/- 1, 2.5 +/- 0.8, 6 +/- 1.5, 0.48 +/- 0.15 and 0.0013 +/- 0.0003 mM, respectively. Sulfhydryl group binding agents as well as thiol reagents inhibit the enzyme activity.
Collapse
|
44
|
|
45
|
Chatterjee U, Maiti S, Sengupta KK. Kinetics of Oxidation of Oxalic Acid by Hexachloroiridate (IV). Z PHYS CHEM 1980. [DOI: 10.1515/zpch-1980-01148] [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: 11/15/2022]
|
46
|
Bandyopadhyay SB, Chatterjee U. A note on the evaluation of meshiness of jute fibre reeds and average fineness of combed fibres by gravimetric method. ACTA ACUST UNITED AC 1960. [DOI: 10.1080/19447026008659765] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|