1
|
van der Meer D, Chovet L, Bera A, Richard A, Sánchez Cuevas PJ, Sánchez-Ibáñez JR, Olivares-Mendez M. REALMS: Resilient exploration and lunar mapping system. Front Robot AI 2023; 10:1127496. [PMID: 37064576 PMCID: PMC10097953 DOI: 10.3389/frobt.2023.1127496] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Accepted: 03/10/2023] [Indexed: 04/03/2023] Open
Abstract
Space resource utilisation is opening a new space era. The scientific proof of the presence of water ice on the south pole of the Moon, the recent advances in oxygen extraction from lunar regolith, and its use as a material to build shelters are positioning the Moon, again, at the centre of important space programs. These worldwide programs, led by ARTEMIS, expect robotics to be the disrupting technology enabling humankind’s next giant leap. However, Moon robots require a high level of autonomy to perform lunar exploration tasks more efficiently without being constantly controlled from Earth. Furthermore, having more than one robotic system will increase the resilience and robustness of the global system, improving its success rate, as well as providing additional redundancy. This paper introduces the Resilient Exploration and Lunar Mapping System, developed with a scalable architecture for semi-autonomous lunar mapping. It leverages Visual Simultaneous Localization and Mapping techniques on multiple rovers to map large lunar environments. Several resilience mechanisms are implemented, such as two-agent redundancy, delay invariant communications, a multi-master architecture different control modes. This study presents the experimental results of REALMS with two robots and its potential to be scaled to a larger number of robots, increasing the map coverage and system redundancy. The system’s performance is verified and validated in a lunar analogue facility, and a larger lunar environment during the European Space Agency (ESA)-European Space Resources Innovation Centre Space Resources Challenge. The results of the different experiments show the efficiency of REALMS and the benefits of using semi-autonomous systems.
Collapse
Affiliation(s)
- D. van der Meer
- Space Robotics (SpaceR) Research Group, Interdisciplinary Centre for Security, Reliability and Trust (SnT), University of Luxembourg, Luxembourg City, Luxembourg
- *Correspondence: D. van der Meer,
| | - L. Chovet
- Space Robotics (SpaceR) Research Group, Interdisciplinary Centre for Security, Reliability and Trust (SnT), University of Luxembourg, Luxembourg City, Luxembourg
| | - A. Bera
- Space Robotics (SpaceR) Research Group, Interdisciplinary Centre for Security, Reliability and Trust (SnT), University of Luxembourg, Luxembourg City, Luxembourg
| | - A. Richard
- Space Robotics (SpaceR) Research Group, Interdisciplinary Centre for Security, Reliability and Trust (SnT), University of Luxembourg, Luxembourg City, Luxembourg
| | | | - J. R. Sánchez-Ibáñez
- Guidance Navigation and Control Department, Airbus Defence and Space Ltd., Stevenage, United Kingdom
| | - M. Olivares-Mendez
- Space Robotics (SpaceR) Research Group, Interdisciplinary Centre for Security, Reliability and Trust (SnT), University of Luxembourg, Luxembourg City, Luxembourg
| |
Collapse
|
2
|
Saha A, Mukhopadhyay M, Paul S, Bera A, Bandyopadhyay T. Incidental diagnosis of medullary thyroid carcinoma due to persistently elevated procalcitonin in a patient with COVID-19 pneumonia: A case report. World J Clin Cases 2022; 10:7171-7177. [PMID: 36051107 PMCID: PMC9297425 DOI: 10.12998/wjcc.v10.i20.7171] [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] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/04/2022] [Revised: 04/13/2022] [Accepted: 05/17/2022] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Procalcitonin (Pct) is a common biomarker in clinical practice, especially in the era of coronavirus disease 2019 (COVID-19) infection. Although it is frequently used for the diagnosis and prognostication of bacterial infections or sepsis, it is also elevated in a few other conditions, including medullary thyroid carcinoma (MTC).
CASE SUMMARY A 43-year-old female presented with moderately severe COVID-19 pneumonia in April 2021. She gradually recovered clinically; however, despite normalization of other inflammatory markers, Pct levels remained persistently elevated. Further workup identified the cause as left lobe MTC with locoregional metastasis. Calcitonin levels were high, and carcinoembryonic antigen levels were normal. The patient underwent total thyroidectomy and neck dissection, which was followed by another radical neck dissection due to residual disease. Currently, she is doing well, nearly having completed her course of external beam radiotherapy with no recurrence. Pct is well documented as a screening tool for MTC, especially because of its stable nature compared to calcitonin in the community settings. It is important to keep in mind the differential diagnosis of MTC in patients with persistently elevated Pct levels despite normal levels of other acute phase reactants. To the best of our knowledge, this is the first report from Asia of such an incidental diagnosis of MTC due to persistently elevated Pct levels in a patient with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection.
CONCLUSION Persistently elevated Pct levels can occur in any pro-inflammatory state including infections, sepsis, or acute respiratory distress syndrome. In the current setting, SARS-CoV-2 infection is one such clinical scenario, and in rare situations of persistent elevation, MTC may need to be ruled out.
Collapse
Affiliation(s)
- Amitabha Saha
- Department of Internal Medicine, Critical Care Medicine, Medica Superspecialty Hospital, Kolkata 700099, West Bengal, India
| | - Madhusha Mukhopadhyay
- Department of Internal Medicine, Medica Superspecialty Hospital, Kolkata 700099, West Bengal, India
| | - Souvik Paul
- Department of Critical Care Medicine, Medica Superspecialty Hospital, Kolkata 700099, West Bengal, India
| | - Arnab Bera
- Department of Critical Care Medicine, Medica Superspecialty Hospital, Kolkata 700099, West Bengal, India
| | - Tapas Bandyopadhyay
- Department of Internal Medicine, Medica Superspecialty Hospital, Kolkata 700099, West Bengal, India
| |
Collapse
|
3
|
Ray A, Chattopadhyay E, Singh R, Ghosh S, Bera A, Sarma M, Munot M, Desai U, Rajan S, Prabhudesai P, Prakash AK, Roy Chowdhury S, Bhowmick N, Dhar R, Udwadia ZF, Dey A, Mitra S, Joshi JM, Maitra A, Roy B. Genetic insight into Birt-Hogg-Dubé syndrome in Indian patients reveals novel mutations at FLCN. Orphanet J Rare Dis 2022; 17:176. [PMID: 35477461 PMCID: PMC9044636 DOI: 10.1186/s13023-022-02326-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Accepted: 04/09/2022] [Indexed: 11/10/2022] Open
Abstract
Background Birt-Hogg-Dubé syndrome (BHDS) is a rare monogenic condition mostly associated with germline mutations at FLCN. It is characterized by either one or more manifestations of primary spontaneous pneumothorax (PSP), skin fibrofolliculomas and renal carcinoma (chromophobe). Here, we comprehensively studied the mutational background of 31 clinically diagnosed BHDS patients and their 74 asymptomatic related members from 15 Indian families. Results Targeted amplicon next-generation sequencing (NGS) and Sanger sequencing of FLCN in patients and asymptomatic members revealed a total of 76 variants. Among these variants, six different types of pathogenic FLCN mutations were detected in 26 patients and some asymptomatic family members. Two of the variants were novel mutations: an 11-nucleotide deletion (c.1150_1160delGTCCAGTCAGC) and a splice acceptor mutation (c.1301-1G > A). Two variants were Clinvar reported pathogenic mutations: a stop-gain (c.634C > T) and a 4-nucleotide duplication (c.1329_1332dupAGCC). Two known variants were: hotspot deletion (c.1285delC) and a splice donor mutation (c.1300 + 1G > A). FLCN mutations could not be detected in patients and asymptomatic members from 5 families. All these mutations greatly affected the protein stability and FLCN-FNIP2 interaction as observed by molecular docking method. Family-based association study inferred pathogenic FLCN mutations are significantly associated with BHDS. Conclusion Six pathogenic FLCN mutations were detected in patients from 10 families out of 15 families in the cohort. Therefore, genetic screening is necessary to validate the clinical diagnosis. The pathogenic mutations at FLCN affects the protein–protein interaction, which plays key roles in various metabolic pathways. Since, pathogenic mutations could not be detected in exonic regions of FLCN in 5 families, whole genome sequencing is necessary to detect all mutations at FLCN and/or any undescribed gene/s that may also be implicated in BHDS. Supplementary Information The online version contains supplementary material available at 10.1186/s13023-022-02326-5.
Collapse
Affiliation(s)
- Anindita Ray
- Human Genetics Unit, Indian Statistical Institute, Kolkata, India
| | - Esita Chattopadhyay
- Human Genetics Unit, Indian Statistical Institute, Kolkata, India.,Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Richa Singh
- Human Genetics Unit, Indian Statistical Institute, Kolkata, India.,Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Saurabh Ghosh
- Human Genetics Unit, Indian Statistical Institute, Kolkata, India
| | - Arnab Bera
- Department of Pulmonary Medicine, RG Kar Medical College and Hospital, Kolkata, India.,Respiratory Medicine and Critical Care, Medica Superspeciality Hospital, Kolkata, India
| | - Mridul Sarma
- Department of Chest Medicine, Calcutta National Medical College, Kolkata, India.,Narayana Superspeciality Hospital, Guwahati, India
| | - Mahavir Munot
- Department of Pulmonary Medicine, TNMC and BYL Nair Hospital, Mumbai, India
| | - Unnati Desai
- Department of Pulmonary Medicine, TNMC and BYL Nair Hospital, Mumbai, India
| | - Sujeet Rajan
- Department of Chest Medicine, Bombay Hospital Institute of Medical Sciences, Mumbai, India
| | | | - Ashish K Prakash
- Department of Respiratory and Sleep Medicine, Medanta- The Medicity, Gurgram, India
| | - Sushmita Roy Chowdhury
- Apollo Hospital Kolkata, Pulmonology, India.,Fortis Hospital Kolkata, Pulmonology, India
| | - Niladri Bhowmick
- Department of General Medicine, IPGMER&SSKM Hospital, Kolkata, India
| | - Raja Dhar
- CMRI, C K Birla Group of Hospitals, Kolkata, India
| | | | - Atin Dey
- Department of Pulmonary Medicine, RG Kar Medical College and Hospital, Kolkata, India
| | - Subhra Mitra
- Department of Chest Medicine, Calcutta National Medical College, Kolkata, India
| | - Jyotsna M Joshi
- Department of Pulmonary Medicine, TNMC and BYL Nair Hospital, Mumbai, India
| | - Arindam Maitra
- National Institute of Biomedical Genomics, Kalyani, India
| | - Bidyut Roy
- Human Genetics Unit, Indian Statistical Institute, Kolkata, India.
| |
Collapse
|
4
|
Goyal P, Vats B, Subbarao M, Honnappa CG, Kabadi P, Rohil S, Bera A, Mehta GR, Pai H, Adhikari L, Tagore R, Sharma S, Venkatachala R, Nair P, Annegowda S, Sahu A, Trivedi S, Shastri N, Gokhale Y, Thomas R, Thakur A, Mohan D, Rao K U, Melarkode R, Ullanat R. Analytical similarity assessment of MYL-1402O to reference Bevacizumab. Expert Opin Biol Ther 2021; 22:271-298. [PMID: 34465264 DOI: 10.1080/14712598.2021.1973426] [Citation(s) in RCA: 3] [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] [Indexed: 10/20/2022]
Abstract
BACKGROUND Bevacizumab (BEV) is a recombinant humanized monoclonal immunoglobulin G1 antibody that binds to vascular endothelial growth factor (VEGF)-A and acts as an antiangiogenic agent. It is approved for treatment of many cancer indications, including metastatic colorectal cancer and nonsquamous non-small cell lung cancer. RESEARCH DESIGN AND METHODS The analytical similarity of the BEV biosimilar MYL-1402O to reference BEV sourced from the European Union and United States was assessed using physicochemical and functional tests to support the clinical development of MYL-1402O. Assessment of physicochemical and analytical similarity showed that MYL-1402O has the same amino acid sequence and similar posttranslational modification profile as the reference BEV products. RESULTS The functional and biologic activity of MYL-1402O assessed using inhibition of VEGF-induced cell proliferation in human umbilical vein endothelial cells, inhibition of VEGF-induced VEGF receptor 2 phosphorylation, and fragment antigen and fragment crystallizable receptor binding, was comparable to reference BEV products. CONCLUSIONS The totality of the data assessment confirms the high degree of similarity of MYL-1402O to reference BEV with respect to physicochemical and in vitro functional properties. The product quality data presented here, along with data from phase 1 clinical studies, demonstrate the similarity of MYL-1402O to reference BEV products, supporting further clinical development of this BEV biosimilar.
Collapse
Affiliation(s)
- Parag Goyal
- Biologics R&D, Viatris Inc, Canonsburg, PA, USA
| | | | - Malini Subbarao
- Biocon Research Lab, Biocon Biologics Limited, Bengaluru, India
| | | | - Pradeep Kabadi
- Biocon Research Lab, Biocon Biologics Limited, Bengaluru, India
| | - Sheija Rohil
- Biocon Research Lab, Biocon Biologics Limited, Bengaluru, India
| | - Arnab Bera
- Biocon Research Lab, Biocon Biologics Limited, Bengaluru, India
| | | | - Harish Pai
- Biocon Research Lab, Biocon Biologics Limited, Bengaluru, India
| | - Laxmi Adhikari
- Biocon Research Lab, Biocon Biologics Limited, Bengaluru, India
| | | | | | | | - Pradip Nair
- Biocon Research Lab, Biocon Biologics Limited, Bengaluru, India
| | | | - Abhilashi Sahu
- Biocon Research Lab, Biocon Biologics Limited, Bengaluru, India
| | - Sneha Trivedi
- Biocon Research Lab, Biocon Biologics Limited, Bengaluru, India
| | - Namrata Shastri
- Biocon Research Lab, Biocon Biologics Limited, Bengaluru, India
| | - Yatika Gokhale
- Biocon Research Lab, Biocon Biologics Limited, Bengaluru, India
| | - Roshni Thomas
- Biocon Research Lab, Biocon Biologics Limited, Bengaluru, India
| | | | - Deepa Mohan
- Biocon Research Lab, Biocon Biologics Limited, Bengaluru, India
| | | | | | | |
Collapse
|
5
|
Vats B, Goyal P, Mathew Z, Ghosh R, Babu MN, Jadav RS, Nair AM, Subbarao M, Bera A, Prakash Sadasivappa K, Kabadi P, Sarkar A, Honnappa CG, Patnaik US, Singh A, Parambath AV, Ullanat R. Evaluation of physicochemical and biological properties of nonreconstituted MYL-1401O vials, reconstituted MYL-1401O suspension in vial, and diluted MYL-1401O suspension in infusion bags (0.9% saline) for extended duration. Expert Opin Biol Ther 2021; 22:299-311. [PMID: 33896318 DOI: 10.1080/14712598.2021.1917546] [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] [Indexed: 10/21/2022]
Abstract
Background: MYL-1401O; trastuzumab-dkst (Ogivri™; Mylan Inc.) is a biosimilar to the trastuzumab reference product (Herceptin®; Genentech, USA). Assessment of physicochemical stability and biological activity for the non-reconstituted, reconstituted, and infused solution over an extended, clinically relevant duration is critical for ensuring optimal patient outcomes and health resource utilization.Methods: The physicochemical and biological stability of MYL-1401O was assessed in non-reconstituted vials stored at 25 °C ± 2 °C/60% ± 5% relative humidity (RH) for 6 months, reconstituted 21 mg/mL solution in vials stored at 2 °C to 8 °C for 10 days, and diluted in 0.9% saline-containing infusion bags at 0.3 mg/mL and 4.0 mg/mL stored for 77 days at 2 °C to 8 °C, plus an additional 2 days at 25 °C ± 2 °C/60% ± 5% RH.Results: At all storage conditions tested, MYL-1401O was physicochemically and biologically stable for extended duration and under various temperature and humidity conditions.Conclusions: MYL-1401O retained its physicochemical and biological stability under different storage conditions, which supports advanced preparation of MYL-1401O, better efficiency, less wastage, and cost-savings for better patient management.
Collapse
Affiliation(s)
- Bhavesh Vats
- Biologics R&D, Viatris Pharmaceuticals Private Limited, Hyderabad, India
| | - Parag Goyal
- Biologics R&D, Viatris Inc, Canonsburg, PA, USA
| | - Zacharia Mathew
- Quality Control Lab, Biocon Biologics India Limited, Bangalore, India
| | - Ranendu Ghosh
- Quality Control Lab, Biocon Biologics India Limited, Bangalore, India
| | | | - Rahul Singh Jadav
- Quality Control Lab, Biocon Biologics India Limited, Bangalore, India
| | - Arya M Nair
- Quality Control Lab, Biocon Biologics India Limited, Bangalore, India
| | - Malini Subbarao
- Quality Control Lab, Biocon Biologics India Limited, Bangalore, India
| | - Arnab Bera
- Quality Control Lab, Biocon Biologics India Limited, Bangalore, India
| | | | - Pradeep Kabadi
- Quality Control Lab, Biocon Biologics India Limited, Bangalore, India
| | - Anindya Sarkar
- Biologics R&D, Viatris Pharmaceuticals Private Limited, Hyderabad, India
| | | | - Uma Sankar Patnaik
- Biologics R&D, Viatris Pharmaceuticals Private Limited, Hyderabad, India
| | - Ankita Singh
- Quality Control Lab, Biocon Biologics India Limited, Bangalore, India
| | | | - Rajesh Ullanat
- Biologics R&D, Viatris Pharmaceuticals Private Limited, Hyderabad, India
| |
Collapse
|
6
|
Bera A, Eidelman O, Russ E, Landa A, Karaian J, Eklund M, Hu H, Pollard HB, Shriver CD, Srivastava M. Abstract P4-01-26: Circulating cell-free DNA in serum as a marker for the early detection of tumor recurrence in breast cancer patients. Cancer Res 2019. [DOI: 10.1158/1538-7445.sabcs18-p4-01-26] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Background: Quantitative estimation of circulating cell-free DNA (cfDNA) isolated from serum by noninvasive procedures can serve as a potential biomarker for the early detection of many cancers. However, a simple, straightforward technique is unavailable to estimate the cfDNA in clinical labs. Moreover, the prognostic value of cfDNA in patients with breast cancer (BrCa) is currently under debate. The aim of this study was to develop a simple yet effective quantitative method for measuring the cfDNA in serum and to eventually investigate the relationship between cfDNA and the occurrence of recurrence in BrCa patients.
Methods: A total of 240 patient cases (n=240) were selected and are comprised of different subtypes of breast cancer patients and control individuals. We selected 21 serum samples from patients which showed recurrence after 4-7 years of disease-free survival. For the compare studies, each of the recurrent and non-recurrent serum samples was incubated with the SYBR Green I (2 μM). A standard graph was also made with known DNA concentration to calculate the amount of cfDNA in these recurrent and non-recurrent serum samples. Additionally, a comparative study was also performed with the serum of patients with non-recurrent BrCa versus healthy patients.
Results: We develop a simple fluorescent based measuring technique which can easily estimate the cfDNA in one step. SYBR Green binds to DNA, and as a result, the fluorescence of SYBR Green increases substantially. Global Wilcoxon analyses were performed to compare the cfDNA amount between non-recurrent and recurrent patients. There is a significant difference in fluorescent intensities between recurrent patients' samples versus non-recurrent patients which are directly proportional to the cfDNA levels. The amount of cfDNA is higher in recurrent patient (ratio is 1.3 up; p= 0.03; AUC=0.76) compared to similar non-recurrent patients. While we compared the fluorescence data between normal/healthy patients versus non-recurrent is turned out as non-significant (healthy to non-recurrent ratio = 1.03; p= 0.20, AUC=0.61).
Conclusion: In this current study, we developed a straightforward one-step technique to measure the amount of cfDNA in serum, which can easily translate into a clinical diagnostic tool. To the best of our knowledge, this is the first report which demonstrates serum cfDNA as an early detection marker for recurrent breast cancer patients. The relatively high level of cfDNA in the serum of recurrent breast cancer patients compared to non-recurrent breast cancer patients indicates an uncovered circulating genetic information which triggers the cancer recurrence pathway to relapse cancer in the near future.
Citation Format: Bera A, Eidelman O, Russ E, Landa A, Karaian J, Eklund M, Hu H, Pollard HB, Shriver CD, Srivastava M. Circulating cell-free DNA in serum as a marker for the early detection of tumor recurrence in breast cancer patients [abstract]. In: Proceedings of the 2018 San Antonio Breast Cancer Symposium; 2018 Dec 4-8; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2019;79(4 Suppl):Abstract nr P4-01-26.
Collapse
Affiliation(s)
- A Bera
- Uniformed Services University, Bethesda, MD; Walter Reed National Military Medical Center, Bethesda, MD; Chan Soon-Shiong Institute of Molecular Medicine, Windber, PA
| | - O Eidelman
- Uniformed Services University, Bethesda, MD; Walter Reed National Military Medical Center, Bethesda, MD; Chan Soon-Shiong Institute of Molecular Medicine, Windber, PA
| | - E Russ
- Uniformed Services University, Bethesda, MD; Walter Reed National Military Medical Center, Bethesda, MD; Chan Soon-Shiong Institute of Molecular Medicine, Windber, PA
| | - A Landa
- Uniformed Services University, Bethesda, MD; Walter Reed National Military Medical Center, Bethesda, MD; Chan Soon-Shiong Institute of Molecular Medicine, Windber, PA
| | - J Karaian
- Uniformed Services University, Bethesda, MD; Walter Reed National Military Medical Center, Bethesda, MD; Chan Soon-Shiong Institute of Molecular Medicine, Windber, PA
| | - M Eklund
- Uniformed Services University, Bethesda, MD; Walter Reed National Military Medical Center, Bethesda, MD; Chan Soon-Shiong Institute of Molecular Medicine, Windber, PA
| | - H Hu
- Uniformed Services University, Bethesda, MD; Walter Reed National Military Medical Center, Bethesda, MD; Chan Soon-Shiong Institute of Molecular Medicine, Windber, PA
| | - HB Pollard
- Uniformed Services University, Bethesda, MD; Walter Reed National Military Medical Center, Bethesda, MD; Chan Soon-Shiong Institute of Molecular Medicine, Windber, PA
| | - CD Shriver
- Uniformed Services University, Bethesda, MD; Walter Reed National Military Medical Center, Bethesda, MD; Chan Soon-Shiong Institute of Molecular Medicine, Windber, PA
| | - M Srivastava
- Uniformed Services University, Bethesda, MD; Walter Reed National Military Medical Center, Bethesda, MD; Chan Soon-Shiong Institute of Molecular Medicine, Windber, PA
| |
Collapse
|
7
|
Bhowmik K, Deb K, Bera A, Debnath A, Saha B. Interaction of anionic dyes with polyaniline implanted cellulose: Organic π-conjugated macromolecules in environmental applications. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.03.128] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
|
8
|
Ghosh A, Mishra S, Giri S, Mobin SM, Bera A, Chatterjee S. Electrolyte-Free Dye-Sensitized Solar Cell with High Open Circuit Voltage Using a Bifunctional Ferrocene-Based Cyanovinyl Molecule as Dye and Redox Couple. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00104] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- A. Ghosh
- Department of Chemistry, National Institute of Technology Rourkela, Rourkela, Orissa 769008, India
| | - S. Mishra
- Department of Chemistry, National Institute of Technology Rourkela, Rourkela, Orissa 769008, India
| | - S. Giri
- Theoretical Chemistry Laboratory, Department of Chemistry, National Institute of Technology Rourkela, Rourkela, Orissa 769008, India
| | - S. M. Mobin
- Discipline of Chemistry, Indian Institute of Technology Indore, Simrol, Madhya Pradesh 452017, India
| | - A. Bera
- Department of Physics, Indian Institute of Technology Jammu, Jammu, Jammu and Kashmir 181121, India
| | - S. Chatterjee
- Department of Chemistry, National Institute of Technology Rourkela, Rourkela, Orissa 769008, India
| |
Collapse
|
9
|
Biswas D, Kundu S, Bera A, Dey A, Rath S, Pal A. Comparative Study on Outcome of Non-invasive Ventilation in Patients with Acute Exacerbation of COPD Admitted in General Ward vs. High Dependency Unit. J Clin Diagn Res 2018. [DOI: 10.7860/jcdr/2018/35614.11473] [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: 11/24/2022]
|
10
|
Bera A, Leighton XM, Pollard H, Srivastava M. Cyclin E and FGF8 are downstream cell growth regulators in distinct tumor suppressor effects of ANXA7 in hormone-resistant cancer cells of breast versus prostate origin. Trends Cancer Res 2018; 13:55-62. [PMID: 30369774 PMCID: PMC6200414] [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] [Grants] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Tumor suppressor function of Annexin-A7 (ANXA7) was demonstrated by cancer-prone phenotype in Anxa7(+/-) mice and ANXA7 profiling in human cancers including prostate and breast. Consistent with its more evident in vivo tumor suppressor role in prostate cancer, wild-type(wt)-ANXA7 in vitro induced similar G2-arrests, but reduced survival more drastically in prostate cancer cells compared to breast cancer cells (DU145 versus MDA-MB-231 and -435). In all three hormone-resistant cancer cell lines, wt-ANXA7 abolished the expression of the oncogenic low-molecular weight (LMW) cyclin E which was for the first time encountered in prostate cancer cells. Dominant-negative nMMM-ANXA7 (which lacks phosphatidylserine liposome aggregation properties) failed to abrogate LMW-cyclin E and simultaneously induced fibroblast growth factor 8 (FGF8) in DU145 that was consistent with the continuing cell cycle progression and reduced cell death. Adenoviral vector alone induced FGF8 in MDA-MB-231/435 cell lines, but not in DU145 cells. Our data indicated that the LMW-Cyclin E expressions in breast cancer and prostate cancer cell-lines were differentially regulated by wild-type and dominant-negative ANXA7 isoforms, demonstrating a different survival mechanism utilized by breast cancer cells. Conventional tumor suppressor p53 failed to completely abolish FGF8 and LMW-cyclin E in breast cancer cells, which were eventually translated into their survival. Thus, ANXA7 tumor suppression could modulate FGF8 and cyclin E expression, and control implying more specific associations with the annexin properties of ANXA7 in prostate tumorigenesis.
Collapse
|
11
|
Debnath A, Bera A, Chattopadhyay KK, Saha B. Facile additive-free synthesis of hematite nanoparticles for enhanced adsorption of hexavalent chromium from aqueous media: Kinetic, isotherm, and thermodynamic study. INORG NANO-MET CHEM 2017. [DOI: 10.1080/24701556.2017.1357581] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- A. Debnath
- Department of Civil Engineering, National Institute of Technology Agartala, Jirania, West Tripura, India
| | - A. Bera
- Department of Physics, National Institute of Technology Agartala, Jirania, West Tripura, India
| | - K. K. Chattopadhyay
- Thin film and Nanoscience Laboratory, Department of Physics, Jadavpur University, Kolkata, India
| | - B. Saha
- Department of Physics, National Institute of Technology Agartala, Jirania, West Tripura, India
| |
Collapse
|
12
|
Biswas C, Dey P, Mitra S, Bera A, Satpathy S, Karmakar PG. First Report of Potato leaf roll virus (PLRV) Naturally Occurring on Jute (Corchorus olitorius) in India. Plant Dis 2014; 98:1592. [PMID: 30699809 DOI: 10.1094/pdis-07-14-0668-pdn] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Jute (Corchorus olitorius L.) is an important bast fiber crop that is mainly grown in the Southeast Asian countries like India, Bangladesh, Nepal, China, Indonesia, Thailand, Myanmar, and a few South American countries. In June 2013, symptoms suggestive of a viral disease were noticed on jute (cv. JRO524) in an experimental field of the CRIJAF research farm, Barrackpore, India, and the incidence of the disease was less than 2%. The infected plants showed stunted growth and short height. Mostly the upper leaves elongated with curling and coiling of lamina. Puckering and shoe string effect were also noticed. Petioles and stipules of the affected leaves were exceptionally longer. Although initially the incidence was low, it may spread to larger areas in subsequent years. Because the jute fiber is extracted from the stem, stunted growth and short height would badly affect the fiber yield and quality. Ten symptomatic and ten asymptomatic healthy looking samples were collected from the field. Corchorus golden mosaic begomovirus is common in jute; therefore, all the samples were tested by PCR using JMFL-AF/JMFL-AR, DNA-A component specific primer pair and JMFL-BF/JMFL-BR, DNA-B component specific primer pairs (1). However, there was no amplification. Because the aphid Aphis gossypii was often noticed in the jute field, all the samples were tested by double-antibody sandwich (DAS)-ELISA for common aphid transmitted viruses, e.g., Cucumber mosaic virus, Bean common mosaic virus, Cowpea mosaic virus, Papaya ring spot virus, Potato leaf roll virus (PLRV), Potato virus Y, and Watermelon mosaic virus using commercial diagnostic kits (Agdia). The symptomatic samples showed positive reaction only for PLRV. Five ELISA-positive samples and five asymptomatic healthy samples were used for RNA extraction. Total RNA was extracted by using QIAGEN RNeasy mini kit. RT-PCR was carried out with PLRV CP gene specific primer pair (3) which generated a cDNA amplicon of 627 bp in all ELISA-positive symptomatic samples. PLRV was not detected in symptomless samples. The five purified cDNA products were cloned in a pGEM-T Easy vector (Promega) and were sequenced. One of the five identical sequences was deposited in GenBank (Accession No. KF233880). The consensus sequence was analyzed by NCBI BLAST and found to share 99% similarity with the coat protein sequence of PLRV reference strain (S77421). Nucleotide span and ORF finder (NCBI) analysis indicated the 627-bp PCR amplicon coded part of a coat protein gene that had 100% identity with translated gene product (Protein ID AAB33483). PLRV is a small isometric RNA virus with worldwide distribution belonging to the family Luteoviridae whose natural host range is mainly restricted to solanaceous plants and few plants of other families (2,4). To the best of our knowledge, this is the first report of PLRV naturally occurring on jute (C. olitorius). References: (1) R. Ghosh et al. J. Virol. Methods 159:34, 2009. (2) S. Guyader and D. G. Ducray. J. Gen. Virol. 83:1799, 2002. (3) M. A. Mayo et al. J. Gen. Virol. 70:1037, 1989. (4) K. Mukherjee et al. Virus Genes 26:247, 2003.
Collapse
Affiliation(s)
- C Biswas
- Central Research Institute for Jute and Allied Fibres (CRIJAF), Barrackpore, Kolkata, West Bengal 700120, India
| | - P Dey
- Central Research Institute for Jute and Allied Fibres (CRIJAF), Barrackpore, Kolkata, West Bengal 700120, India
| | - S Mitra
- Central Research Institute for Jute and Allied Fibres (CRIJAF), Barrackpore, Kolkata, West Bengal 700120, India
| | - A Bera
- Central Research Institute for Jute and Allied Fibres (CRIJAF), Barrackpore, Kolkata, West Bengal 700120, India
| | - S Satpathy
- Central Research Institute for Jute and Allied Fibres (CRIJAF), Barrackpore, Kolkata, West Bengal 700120, India
| | - P G Karmakar
- Central Research Institute for Jute and Allied Fibres (CRIJAF), Barrackpore, Kolkata, West Bengal 700120, India
| |
Collapse
|
13
|
Arya S, Pareek P, Nehra A, Mercy A, Chaudhury AR, Bera A, Srivastava V, Ghosh SK, Sharma RK. Experimental evaluation of electron gun, PPM focusing and collector for Ka Band TWT. 2014 Tenth International Vacuum Electron Sources Conference (IVESC) 2014. [DOI: 10.1109/ivesc.2014.6891942] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/19/2023]
|
14
|
Biswas C, Dey P, Bera A, Kumar M, Satpathy S. First Report of a 16SrV-C Phytoplasma Causing Little Leaf and Bunchy Top of Tossa Jute (Corchorus olitorius) in India. Plant Dis 2014; 98:565. [PMID: 30708709 DOI: 10.1094/pdis-08-13-0826-pdn] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Jute is the most important phloem fiber crop of the world, and is mainly grown in the South East Asian countries of India, Bangladesh, Nepal, China, Indonesia, Thailand, and Myanmar, and few South American countries. The fiber is used in making sacks, ropes, bags, carpets, shoes, geo-textiles, and home decorations. There are two kinds of jute: tossa jute (Corchorus olitorius L.) and white jute (C. capsularis). In June 2012, symptoms suggestive of phytoplasma infection (little leaf and bunchy top) were noticed on tossa jute in different experimental fields of the CRIJAF research farm, Barrackpore, India, and the incidence of the disease varied from 5 to 20%. The infected plants showed profuse lateral branching with a bushy appearance. In many plants, branching at the apical portion developed a bunchy top symptom with tufts of smaller leaves. Leafy stem was also common in many plants with main stems covered with numerous little leaves. Total DNA was extracted from leaf midveins of 15 symptomatic and 5 asymptomatic plants by using an improved salt concentration and simple sodium acetate CTAB method (1). PCR was carried out with universal P1/P7 primer set followed by nested primer pair R16F2n/R16R2 (3), resulting in DNA amplicons that were 1.8 kb and 1.2 kb, respectively, in all symptomatic samples tested. Phytoplasma was not detected in symptomless samples. The five purified nested products were cloned in a pGEM-T Easy vector (Promega) and sequenced. One of the sequences that proved to be identical was deposited in GenBank (Accession No. KF501045). The consensus sequence was analyzed by NCBI BLAST and found to share 99% similarity with the 16Sr DNA sequence of the alder yellows phytoplasma reference strain (GenBank Accession No. AY028789), which belongs to the 16SrV group. The phylogenetic tree based on the 16SrDNA sequence of phytoplasmas belonging to group 16SrV and other distinct phytoplasma groups also showed that the phytoplasma clustered with members of subgroup 16SrV (4). Subsequently, in silico RFLP analysis of the nested PCR product with the pDRAW32 program using AluI and TruI restriction site used for 16SrV subgroups A, B, C, D, and E indicated that the 16SrV Corchorus strain belonged to subgroup C. RFLP patterns from all symptomatic C. olitorius samples were identical to the 16SrV-C pattern (2). The vector species transmitting the concerned phytoplasma in C. olitorius still needs to be identified. The leaf hopper, Amrasca biguttula biguttula, may be a potential vector as it is often noticed in jute fields. To the best of our knowledge, this is the first report of 16SrV-C phytoplasma associated with tossa jute (C. olitorius) in India. Initiative has to be taken to manage this disease; otherwise, branching of the main stems would badly affect the fiber quality as well as yield. References: (1) C. Biswas et al. Lett. Appl. Microbiol. 56:105, 2012. (2) B. Duduk et al. J. Phytopathology 152:575, 2004. (3) I. M. Lee et al. Int. J. Syst. Evol. Microbiol. 54:337, 2004. (4) N. Saitou and M. Nei. Mol. Biol. Evol. 4:406, 1987.
Collapse
Affiliation(s)
- C Biswas
- Central Research Institute for Jute and Allied Fibres (CRIJAF), Barrackpore, Kolkata, West Bengal 700120, India
| | - P Dey
- Central Research Institute for Jute and Allied Fibres (CRIJAF), Barrackpore, Kolkata, West Bengal 700120, India
| | - A Bera
- Central Research Institute for Jute and Allied Fibres (CRIJAF), Barrackpore, Kolkata, West Bengal 700120, India
| | - M Kumar
- Central Research Institute for Jute and Allied Fibres (CRIJAF), Barrackpore, Kolkata, West Bengal 700120, India
| | - S Satpathy
- Central Research Institute for Jute and Allied Fibres (CRIJAF), Barrackpore, Kolkata, West Bengal 700120, India
| |
Collapse
|
15
|
Biswas C, Dey P, Bera A, Satpathy S, Mahapatra BS. First Report of Bacterial Leaf Spot Caused by Xanthomonas campestris pv. olitorii on Jute Grown for Seed in India. Plant Dis 2013; 97:1109. [PMID: 30722489 DOI: 10.1094/pdis-12-12-1196-pdn] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Jute (Corchorus olitorius L.) is the second most important fiber crop after cotton in terms of global production (3). In November 2011, symptoms suggestive of bacterial infection were observed on a seed crop of jute at the CRIJAF research farm, Barrackpore, West Bengal, India. The disease appeared as small, brown, circular spots, usually less than 5 mm in diameter on the leaves and some of the spots were surrounded by a yellow halo. The lesions on the stems were elongated and in some cases were found to girdle the stem. In the later stages of disease, brown sunken spots were found on the green capsules. Disease incidence varied from about 20% to 90% of the total plants in different affected fields at the CRIJAF research farm. Bacterial leaf spot of jute with similar symptoms was reported in 1957 from Sudan (4). Five symptomatic and three asymptomatic leaf samples were collected from different jute fields. Bacterial colonies isolated on nutrient agar medium from infected young leaves were Xanthomonas-like and pale yellow cream in color. Total DNA was extracted from symptomatic as well as asymptomatic leaf samples by using an improved salt concentration and simple sodium acetate CTAB method (2). Single bacterial colonies were transferred to nutrient agar (NA) medium plates and incubated at 28°C for 48 h. Pure colonies from plates were used directly for DNA extraction using the QIAGEN DNeasy Blood and Tissue kit. PCR was carried out with Xanthomonas campestris specific primers NZ8F3/NZ85R3 (1), which generated an amplicon of 530 bp from all the symptomatic leaf samples as well as pure cultures of the isolated bacteria. No amplification was obtained from asymptomatic leaves. The amplicons from the five symptomatic samples collected from the field were sequenced and showed 100% identity with one another, and one sequence (strain JB-CO-13) was deposited in GenBank (Accession No. KC342185). The BLASTn analysis revealed that bacterial strain JB-CO-13 had 100% identity with X. campestris pv. olitorii (EU285213). Nucleotide span and ORF finder (NCBI) analysis indicated the 530-bp PCR amplicon coded part of a gyrase B gene that had 100% identity with a translated gene product (Protein ID: ABX84334). Three leaves of five 1-month-old jute plants (cv. JRO 204) in pot culture were infiltrated each with a separate bacterial strain using suspensions (1 × 105 CFU/ml) in distilled water. The negative control consisted of leaves infiltrated with sterile distilled water. The plants were kept in a greenhouse with mean maximum and minimum temperatures of 28.96 and 21.8°C, respectively. The plants were covered with plastic bags to maintain high relative humidity (>80%). Typical bacterial lesions were recorded on all the inoculated plants after 1 week. No lesions were seen on the negative control. To the best of our knowledge, this is the first report of bacterial leaf spot on C. olitorius caused by X. campestris pv. olitorii from India. References: (1) J. Adriko et al. Plant Pathol. 61:489, 2012. (2) C. Biswas, et al. Lett. Appl. Microbiol. 56:105, 2013. (3) Food and Agriculture Organization of the United Nations. Agricultural Commodities: Profiles and Relevant WTO Negotiating Issues. Online: http://www.fao.org/docrep/006/Y4343E/y4343e03.htm , 2003. (4) K. A. Sabet. Ann. Appl. Biol. 45:516, 1957.
Collapse
Affiliation(s)
- C Biswas
- Central Research Institute for Jute and Allied Fibres (CRIJAF), Barrackpore, Kolkata, West Bengal, 700120, India
| | - P Dey
- Central Research Institute for Jute and Allied Fibres (CRIJAF), Barrackpore, Kolkata, West Bengal, 700120, India
| | - A Bera
- Central Research Institute for Jute and Allied Fibres (CRIJAF), Barrackpore, Kolkata, West Bengal, 700120, India
| | - S Satpathy
- Central Research Institute for Jute and Allied Fibres (CRIJAF), Barrackpore, Kolkata, West Bengal, 700120, India
| | - B S Mahapatra
- Central Research Institute for Jute and Allied Fibres (CRIJAF), Barrackpore, Kolkata, West Bengal, 700120, India
| |
Collapse
|
16
|
Ramachandra M, Pandit C, Subramanya H, Chikkanna D, Lakshminarasimhan A, Khairnar V, Panigrahi S, Ramanathan A, Satyanandan A, Rao N, Bera A, Narayanan K, Gopinath S, Ramachandra R. Abstract 5389: Novel inhibitors of nicotinamide phosphoribosyl transferase (NAMPT). Cancer Res 2013. [DOI: 10.1158/1538-7445.am2013-5389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Nicotinamide phosphoribosyl transferase (NAMPT) is the enzyme that catalyzes the rate limiting step in the salvage pathway of Nicotinamide Adenine Dinucleotide (NAD) biosynthesis. NAMPT is reported to be overexpressed in a number of cancer and inflammatory indications. Because of the requirement of NAD as a co-factor or substrate for a number of key biochemical pathways including those catalyzed by PARP1, Sirtuins and ADP-ribosyl cyclase, inhibition of NAMPT has been shown to result in anti-tumor efficacy in preclinical models. Two NAMPT Inhibitors FK866/APO866 and GMX1778 are currently in clinical trials for oncology indications. In the presence of these clinical agents, cultured cell lines show development of resistance due to mutations underscoring the potential need for inhibitors from distinct chemical series.
Here, we report a structure-guided drug design based approach for identification of lead compounds from two chemical series selectively targeting NAMPT. Determination of co-crystal structures with several de novo designed hits greatly aided in the identification of lead compounds that exhibited potent inhibition of NAMPT against both wild type and resistance mutants (G217R and H191R) Lead compounds were highly active in inhibiting proliferation that correlated well with cellular NAD depletion in several cancer cell lines. Normal cells and selected cancer cell lines have an NAMPT independent salvage pathway for biosynthesis of NAD, which is dependent on nicotinic acid phosphoribosyltransferase (NAPRT) and Nicotinic acid (NA). The anti-proliferative activities were fully rescued in NAPRT- proficient cell lines with the addition of NA, confirming the mechanism of action through specific NAD depletion. Lead compounds from both series exhibited excellent drug-like properties including solubility, metabolic stability and permeability, and desired exposure in pharmacokinetic studies. Anti-tumor activities of these compounds including NA rescue in NAPRT-proficient tumor models are currently being evaluated in preclinical models.
Citation Format: Murali Ramachandra, Chetan Pandit, Hosahalli Subramanya, Dinesh Chikkanna, Anirudha Lakshminarasimhan, Vinayak Khairnar, Sunil Panigrahi, Anuradha Ramanathan, Aparna Satyanandan, Narasimha Rao, Arnab Bera, Kishore Narayanan, Sreevalsam Gopinath, Raghuveer Ramachandra. Novel inhibitors of nicotinamide phosphoribosyl transferase (NAMPT). [abstract]. In: Proceedings of the 104th Annual Meeting of the American Association for Cancer Research; 2013 Apr 6-10; Washington, DC. Philadelphia (PA): AACR; Cancer Res 2013;73(8 Suppl):Abstract nr 5389. doi:10.1158/1538-7445.AM2013-5389
Collapse
Affiliation(s)
| | - Chetan Pandit
- Aurigene Discovery Technologies Limited, Bangalore, India
| | | | | | | | | | | | | | | | - Narasimha Rao
- Aurigene Discovery Technologies Limited, Bangalore, India
| | - Arnab Bera
- Aurigene Discovery Technologies Limited, Bangalore, India
| | | | | | | |
Collapse
|
17
|
Biswas C, Dey P, Satpathy S, Sarkar SK, Bera A, Mahapatra BS. A simple method of DNA isolation from jute (Corchorus olitorius) seed suitable for PCR-based detection of the pathogen Macrophomina phaseolina (Tassi) Goid. Lett Appl Microbiol 2012; 56:105-10. [PMID: 23121598 DOI: 10.1111/lam.12020] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2012] [Revised: 10/26/2012] [Accepted: 10/26/2012] [Indexed: 11/30/2022]
Abstract
A simple method was developed for isolating DNA from jute seed, which contains high amounts of mucilage and secondary metabolites, and a PCR protocol was standardized for detecting the seedborne pathogen Macrophomina phaseolina. The cetyl trimethyl ammonium bromide method was modified with increased salt concentration and a simple sodium acetate treatment to extract genomic as well as fungal DNA directly from infected jute seed. The Miniprep was evaluated along with five other methods of DNA isolation in terms of yield and quality of DNA and number of PCR positive samples. The Miniprep consistently recovered high amounts of DNA with good spectral qualities at A260/A280. The DNA isolated from jute seed was found suitable for PCR amplification. Macrophomina phaseolina could be detected by PCR from artificially inoculated as well as naturally infected jute seeds. The limit of PCR-based detection of M. phaseolina in jute seed was determined to be 0·62 × 10(-7) CFU g(-1) seed.
Collapse
Affiliation(s)
- C Biswas
- Crop Protection Division, Central Research Institute for Jute and Allied Fibres (CRIJAF), Barrackpore, Kolkata, West Bengal, India.
| | | | | | | | | | | |
Collapse
|
18
|
Gopalakrishnan S, Megalamani SB, Bera A, Viswam V. Tracheo-innominate artery fistula: massive hemorrhage after decannulation. Otolaryngol Head Neck Surg 2011; 136:S73-4. [PMID: 17398349 DOI: 10.1016/j.otohns.2006.11.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2006] [Accepted: 11/01/2006] [Indexed: 11/30/2022]
Affiliation(s)
- S Gopalakrishnan
- Department of Ear, Nose, and Throat, Jawaharlal Institute of Postgraduate Medical Education and Research, Pondicherry-605006, India
| | | | | | | |
Collapse
|
19
|
Bera A, Ghosh T, Basak D. Enhanced photoluminescence and photoconductivity of ZnO nanowires with sputtered Zn. ACS Appl Mater Interfaces 2010; 2:2898-2903. [PMID: 20919682 DOI: 10.1021/am1006047] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
We have sputtered Zn onto quasi-one-dimensional ZnO nanowires (NWs) in order to investigate the effect of Zn diffusion on the photoluminescence and photoconduction properties of ZnO NWs. Elemental mapping clearly indicates higher Zn concentration in the NWs due to diffusion of Zn. The Zn-sputtered NWs show an enhanced ultraviolet emission with 7 nm red shift. Since the ionization energy of Zni is 51 meV, the enhanced PL emission with a red shift is correlated to the coupling between free exciton and zinc interstitials (Zni) defects. The photocurrent transients show almost 20 times more photocurrent generation in Zn/ZnO NWs compared to the as-grown NWs. In contrast, the thin film shows no significant change in the photoluminescence and photoconductivity. Based on the photoconductivity and photoluminescence results, we predict that Zn diffusion in the NWs occurs easily compared to the films because of the smaller dimensions of the NWs.
Collapse
Affiliation(s)
- A Bera
- Department of Solid State Physics, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | | | | |
Collapse
|
20
|
Bera A, Basak D. Correlation between the microstructure and the origin of the green luminescence in ZnO: A case study on the thin films and nanowires. Chem Phys Lett 2009. [DOI: 10.1016/j.cplett.2009.06.049] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
21
|
|
22
|
Abstract
Nucleic acid induces conformational changes in the prion protein (23-231 amino acids) to a structure resembling its pathological isoform. The prion protein, in turn, facilitates DNA strand transfer and acts as a DNA chaperone which is modulated by the N-terminal unstructured basic segment of the protein. Here we have studied the prion protein induced conformational changes in DNA using oligonucleotides covalently labeled with the energy donor fluorescein and the acceptor rhodamine moieties by fluorescence resonance energy transfer (FRET) and by thermal stability of the unlabeled oligonucleotides. The protein induces a strong FRET effect in the oligonucleotides evidenced from the simultaneous quenching of fluorescence intensity of the donor and increase in the fluorescence intensity of the acceptor, which indicate bending of the oligonucleotides by the prion protein. The energy transfer efficiency induced by the protein is greater for the larger oligonucleotide. The prion protein also induces significant structural destabilization of the oligonucleotides observed from the lowering of their melting temperatures in the presence of the protein. The truncated globular prion protein 121-231 fragment neither induces FRET effect on the oligonucleotides nor destabilizes their structures, indicating that the N-terminal segment of the prion protein is essential for the DNA bending process. Equilibrium binding and kinetics of FRET show that the protein binding to the oligonucleotides and their bending occur simultaneously. The DNA structural changes observed in the presence of the prion protein are similar to those caused by proteins involved in initiation and regulation for protein synthesis.
Collapse
Affiliation(s)
- A Bera
- Institut National de la Recherche Agronomique, 37380 Nouzilly, France
| | | | | |
Collapse
|
23
|
Abstract
Nucleic-acid-induced polymerisation of prion protein, when monitored by anilino naphthalene sulfonic acid dye, shows, successively, an immediate fluorescence increase of the dye upon mixing of the reactants, followed by a lag period in which the dye fluorescence remains unchanged, and then a phase in which dye fluorescence increases with time. The biological polyamines spermine and spermidine reduce the extent of the initial fluorescence increase, increase the lag period, and reduce both the rate and the extent of increase in fluorescence intensity of the dye in the final phase of the reaction. Spermidine is less effective than spermine in all of these processes. A nearly fivefold lower concentration of spermine can inhibit polymerisation of prion protein by tRNAs compared to the same process induced by double-stranded nucleic acid. The change in the secondary structure of the globular domain of the protein induced by nucleic acid is reversed by the addition of spermine, and it prevents structural destabilization of this domain induced by nucleic acids. It is suggested that physiological event(s) that would reduce the concentrations of intracellular biological amines may make nucleic acid available to induce oligomerization and polymerisation of cellular prion protein related to prion disease.
Collapse
Affiliation(s)
- A Bera
- Infectiologie Animale et Santé Publique, Institut National de la Recherche Agronomique, Nouzilly, France
| | | |
Collapse
|
24
|
Nandi PK, Bera A, Sizaret PY. Osmolyte trimethylamine N-oxide converts recombinant alpha-helical prion protein to its soluble beta-structured form at high temperature. J Mol Biol 2006; 362:810-20. [PMID: 16949096 DOI: 10.1016/j.jmb.2006.07.060] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [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: 04/18/2006] [Revised: 06/12/2006] [Accepted: 07/25/2006] [Indexed: 11/26/2022]
Abstract
The thermal unfolding of full-length human recombinant alpha-helical prion protein (alpha-PrP) in neutral pH is reversible, whereas, in the presence of the osmolyte N-trimethylamine oxide (TMAO), the protein acquires a beta-sheet structure at higher temperatures and the thermal unfolding of the protein is irreversible. Lysozyme, an amyloidogenic protein similar to prion protein, regains alpha-helical structure on cooling from its thermally unfolded form in buffer and in TMAO solutions. The thermal stability of alpha-PrP decreases, whereas that of lysozyme increases in TMAO solution. Light-scattering and turbidity values indicate that beta-sheet prion protein exists as soluble oligomers that increase thioflavin T fluorescence and bind to 1-anilino 8-naphthalene sulfonic acid (ANS). The oligomers are resistant to proteinase K digestion and during incubation for long periods they form linear amyloids>5 microm long. The comparable fluorescence polarization of the tryptophan groups and their accessibility to acrylamide in alpha-PrP and oligomers indicate that the unstructured N-terminal segments of the protein, which contain the tryptophan groups, do not associate among themselves during oligomerization. Partial unfolding of alpha-helical prion protein in TMAO solution leads to its structural conversion to misfolded beta-sheet form. The formation of the misfolded prion protein oligomers and their polymerization to amyloids in TMAO are unusual, since the osmolyte generally induces denatured protein to fold to a native-like state and protects proteins from thermal denaturation and aggregation.
Collapse
Affiliation(s)
- P K Nandi
- Infectiologie Animale et Santé Publique, Institut National de la Recherche Agronomique, 37380 Nouzilly, France.
| | | | | |
Collapse
|
25
|
|
26
|
Biswas G, Gomes A, Pal A, Bera A, Ghatak K, Haider U, Banerjee A. Crystal structure of trans-9,10-dichlorotricyclo [3.3.2.01,5]decan-2-one, C10H12Cl2O. Z KRIST-NEW CRYST ST 1997. [DOI: 10.1524/ncrs.1997.212.1.265] [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: 11/24/2022]
|
27
|
|
28
|
Pain S, Bera A, Das M, Das BN, Banerjee A. On structural aspects of peptidoglycan of bacterial cell wall with special attention on mycobacteria by computer modelling. Indian J Lepr 1992; 64:28-41. [PMID: 1573299] [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: 12/27/2022]
Abstract
The cell wall components of mycobacteria are said to be vitally linked with their pathogenicity. Peptidoglycan, one of the major cell wall component in most of the bacteria are multilayered in gram positive bacteria and it is diverse in nature for the Gram positive strain rather than gram negative. The cell wall of bacteria are primary targets for many drugs and antibiotics and conformation of the major cell wall components provide invaluable information and understanding at molecular level to medicinal chemists and drug designers. Mycobacterial peptidoglycan has been studied critically by computer modelling on various aspects. A plausible structure and conformation has been identified and glycan chain is found to have a pseudo two fold symmetry taking disaccharide unit as monomer with Knox & Murthy H-bond scheme. This paper attempts to clarify the understanding of organisation and possible interaction mode of peptidoglycan of organisation in complex mycobacterial cell wall structure.
Collapse
Affiliation(s)
- S Pain
- Vivekananda College, Calcutta
| | | | | | | | | |
Collapse
|
29
|
Bera A, Banerjee A. Studies on lipids in mycobacterial cell wall: their important structure and function relating to pathogenicity and their biological activity. Indian J Lepr 1989; 61:143-50. [PMID: 2664014] [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: 01/02/2023]
Abstract
The lipids cord-factor, mycosides and sulpholipids are supposed to be vitally linked with the pathogenecity of mycobacteria. In this paper an attempt has been made to clarify the understanding of the occurrence, organisation and possible interaction of the diverse lipids present in the mycobacterial cell wall and their possible structure and function.
Collapse
Affiliation(s)
- A Bera
- Biophysics Department, Bose Institute, Calcutta, India
| | | |
Collapse
|
30
|
Sen GP, De S, Chakravorty AK, Saha SC, Bera A, Khanna PN. Sero-epidemiological evidence of Coxiella burnetii infection among selected human population in Calcutta. Indian J Med Res 1978; 68:911-6. [PMID: 750441] [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: 12/24/2022] Open
|
31
|
Vasiliu L, Bera A, Vinţe D. [The prevention of dental caries]. Munca Sanit 1970; 18:736-41. [PMID: 5206059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
|