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Fang C, Kanemaru K, Carvalho WSP, Fruehauf KR, Zhang S, Das PP, Xu C, Lu Y, Rajagopalan N, Kulka M, Makeiff DA, Serpe MJ. Self-assembled poloxamer-legumin/vicilin nanoparticles for the nanoencapsulation and controlled release of folic acid. Int J Biol Macromol 2024; 268:131646. [PMID: 38636765 DOI: 10.1016/j.ijbiomac.2024.131646] [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: 01/02/2024] [Revised: 04/12/2024] [Accepted: 04/14/2024] [Indexed: 04/20/2024]
Abstract
Plant-based food proteins are a promising choice for the preparation of nanoparticles (NPs) due to their high digestibility, low cost, and ability to interact with various compounds and nutrients. Moreover, nanoencapsulation offers a potential solution for protecting nutrients during processing and enhancing their bioavailability. This study aimed to develop and evaluate nanoparticles (NPs) based on legumin/vicilin (LV) proteins extracted from fava beans, with the goal of encapsulating and delivering a model nutraceutical compound, folic acid (FA). Specifically, NPs were self-assembled from LV proteins extracted from commercially available frozen fava beans using a pH-coacervation method with poloxamer 188 (P188) and chemically cross-linked with glutaraldehyde. Microscopy and spectroscopy studies were carried out on the empty and FA-loaded NPs in order to evaluate the particle morphology, size, size distribution, composition, mechanism of formation, impact of FA loading and release behavior. In vitro studies with Caco-2 cells also confirmed that the empty and FA-loaded nanoparticles were non-toxic. Thus, the LV-NPs are good candidates as food additives for the delivery and stabilization of nutrients as well as in drug delivery for the controlled release of therapeutics.
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Affiliation(s)
- Changhao Fang
- Department of Chemistry, University of Alberta, Edmonton, AB T6G 2G2, Canada
| | - Karen Kanemaru
- Department of Chemistry, University of Alberta, Edmonton, AB T6G 2G2, Canada
| | | | - Krista R Fruehauf
- Department of Chemistry, University of Alberta, Edmonton, AB T6G 2G2, Canada
| | - Sunshine Zhang
- Department of Chemistry, University of Alberta, Edmonton, AB T6G 2G2, Canada
| | - Prem P Das
- Aquatic and Crop Resource Development Research Centre, National Research Council Canada, 110 Gymnasium Pl, Saskatoon, SK S7N 0W9, Canada
| | - Caishuang Xu
- Aquatic and Crop Resource Development Research Centre, National Research Council Canada, 110 Gymnasium Pl, Saskatoon, SK S7N 0W9, Canada
| | - Yuping Lu
- Aquatic and Crop Resource Development Research Centre, National Research Council Canada, 110 Gymnasium Pl, Saskatoon, SK S7N 0W9, Canada
| | - Nandhakishore Rajagopalan
- Aquatic and Crop Resource Development Research Centre, National Research Council Canada, 110 Gymnasium Pl, Saskatoon, SK S7N 0W9, Canada; Department of Chemical and Biological Engineering, University of Saskatchewan, 57 Campus Drive, Saskatoon, SK S7N 5A9, Canada
| | - Marianna Kulka
- Quantum and Nanotechnologies Research Centre, National Research Council Canada, 11421 Saskatchewan Dr NW, Edmonton, AB T6G 2M9, Canada; Department of Medical Microbiology and Immunology, University of Alberta, Edmonton, AB T6G 2G2, Canada
| | - Darren A Makeiff
- Quantum and Nanotechnologies Research Centre, National Research Council Canada, 11421 Saskatchewan Dr NW, Edmonton, AB T6G 2M9, Canada.
| | - Michael J Serpe
- Department of Chemistry, University of Alberta, Edmonton, AB T6G 2G2, Canada.
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Datta A, Hasan MN, Mostafa SN, Das PP, Bhowmik B. Respiratory Complications of COVID-19 Survivors in Bangladesh: A Radiological Evaluation. Mymensingh Med J 2023; 32:823-832. [PMID: 37391981] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/02/2023]
Abstract
Following the COVID-19 pandemic, a growing percentage of COVID-19 survivors exhibit post-COVID symptoms. This cross-sectional study aimed to assess radiological findings in individuals having post-COVID respiratory problems. This study was conducted in the Departments of Radiology and Imaging and Internal Medicine, Bangabandhu Sheikh Mujib Medical University (BSMMU), Dhaka, Bangladesh from November 2021 to June 2022 and included 30 COVID survivors aged 40 to 65 years. We employed a pre-tested semi-structured questionnaire including socio-demographic information, clinical data and CT chest imaging parameters. Pearson's correlation coefficient was calculated, as well as multiple linear regressions. Among 30 participants, 56.0% were male. The mean age of the respondents was 51.20 years (standard deviation of 7.09), ranging from 40 to 65 years. Approximately one-third of the participants had at least one co-morbid condition where hypertension (26.67%), diabetes (26.67%), chronic interstitial lung disease (16.67%) and obesity (16.67%) were most commonly recorded. Approximately 20.0% of participants were smokers. The incident of at least one post-COVID symptom was 100.0%. Approximately 73.0% presented with post-COVID lethargy, 16.67% with SoB (Shortness of Breath), and 90.0% of participants complaint of self-reported anxiety. We have found a positive correlation between age and overall lung involvement. The most common lung tomographic findings were fibrosis (93.0%) and diffuse ground glass opacity (70.0%). Interstitial lung thickening was found in 50.0% of cases and bronchiectasis accounted for 16.67%. In 6.6% of cases, there was no pulmonary lesion. It was notifiable that, with time, the feature of DGGO (diffuse ground glass opacity) became subtle and the total lung involvement decreased from 75.0% to about 25.0% during the post-COVID period. Timely assessment for post-COVID pulmonary sequelae by high-resolution CT chest scan might play an important role in modulating a treatment plan for patients suffering from the post-COVID syndrome.
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Affiliation(s)
- A Datta
- Dr Anindita Datta, Associate Professor, Department of Radiology and Imaging, Bangabandhu Sheikh Mujib Medical University (BSMMU), Dhaka, Bangladesh; E-mail:
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Datta A, Dipi RM, Mostafa SN, Islam MN, Das PP. Evaluation of Diagnostic Performance of Chest CT with RT-PCR in Suspected Coronavirus Patients in Bangladesh. Mymensingh Med J 2020; 29:964-968. [PMID: 33116103] [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: 06/11/2023]
Abstract
A cross sectional study was conducted to demonstrate the value of Computed Tomographic (CT) scan in clinically suspected 114 COVID-19 patients with emphasis on identifying and characterizing the most common findings of chest CT. The CT findings were compared and correlated with the results of Reverse Transcriptase Polymerase Chain Reaction for corona virus disease. This study was conducted in the Department of Radiology and Imaging, Bangabandhu Sheikh Mujib Medical University, Dhaka with clinically COVID-19 suspected patients. This cross sectional study was performed from July 7 to August 7, 2020 where both chest HRCT and RT-PCR test were included, keeping RT-PCR as the reference standard. Of the 114 patients 104(91.22%) patients had ground glass opacities (with no consolidation), 50(43.85%) patients had ground glass opacity and consolidation. Along with ground glass opacities 60(52.63%) patients had associated crazy paving appearance, 44(39.59%) patients had reverse halo sign, 76(66.66%) patients had vascular thickening and 60(52.63%) patients had fibrotic shadows. Most patients (94%) (98/104) had bilateral chest CT findings. Out of 114 patients, 96 (84%) patients had positive RT-PCR results and 18(15.7%) patients had negative RT-PCR results. Out of 96 RT-PCR positive patients, 90 patients had positive chest CT findings, where was 06 patients had negative CT findings. On the other hand, out of 18 RT-PCR negative patients, 14 patients had positive chest CT findings while 4 patients had negative chest CT findings. To conclude, chest CT imaging has high sensitivity for diagnosis of COVID-19, Data and analysis from our study suggests that chest CT ought to be considered for the COVID-19 as a primary diagnostic tool for early detection of COVID-19 patients where awaited RT-PCR results.
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Affiliation(s)
- A Datta
- Dr Anindita Datta, Assistant Professor, Department of Radiology and Imaging, Bangabandhu Sheikh Mujib Medical University (BSMMU), Dhaka, Bangladesh
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Adnan HS, Matthews S, Hackl M, Das PP, Manaswini M, Gadamsetti S, Filali M, Owoyele B, Santuber J, Edelman J. Human centered AI design for clinical monitoring and data management. Eur J Public Health 2020. [DOI: 10.1093/eurpub/ckaa165.225] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Background
In clinical settings, significant resources are spent on data collection and monitoring patients' health parameters to improve decision-making and provide better care. With increased digitization, the healthcare sector is shifting towards implementing digital technologies for data management and in administration. New technologies offer better treatment opportunities and streamline clinical workflow, but the complexity can cause ineffectiveness, frustration, and errors. To address this, we believe digital solutions alone are not sufficient. Therefore, we take a human-centred design approach for AI development, and apply systems engineering methods to identify system leverage points. We demonstrate how automation enables monitoring clinical parameters, using existing non-intrusive sensor technology, resulting in more resources toward patient care. Furthermore, we provide a framework on digitization of clinical data for integration with data management.
Methods
Activities of Daily Living (ADLs) are essential parameters, necessary for evaluating patients in mental health wards. Ideally logging the parameters should take place at hourly intervals; however, time constraints and lack of resources restrict the nursing staff to consolidating the overall impression during the day, relying on what they recall. Using design methods, sensors (e.g. infrared, proximity, pressure) are used to automate the acquisition of data for machine learning that correspond to the ADLs, considering privacy and other medical requirements.
Results
We present a concept of a room with sensors that can be deployed in clinical settings. Sensor data log ADLs, and provide machine learning data. A theoretical framework demonstrates how collected data can be used in electronic/medical health records.
Conclusions
Data acquisition of the ADLs with automation enable variable specificity and sensitivity on-demand. It further facilitates interoperability and provides data for machine learning.
Key messages
Our research demonstrates automated data acquisition techniques for clinical monitoring. Human centered AI design approach enables on-demand analysis of ADLs for mental health treatment.
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Affiliation(s)
- H S Adnan
- Digital Health Center, Hasso Plattner Institute, Potsdam, Germany
| | - S Matthews
- Digital Health Center, Hasso Plattner Institute, Potsdam, Germany
| | - M Hackl
- Digital Health Center, Hasso Plattner Institute, Potsdam, Germany
| | - P P Das
- Digital Health Center, Hasso Plattner Institute, Potsdam, Germany
| | - M Manaswini
- Digital Health Center, Hasso Plattner Institute, Potsdam, Germany
| | - S Gadamsetti
- Digital Health Center, Hasso Plattner Institute, Potsdam, Germany
| | - M Filali
- Digital Health Center, Hasso Plattner Institute, Potsdam, Germany
| | - B Owoyele
- Digital Health Center, Hasso Plattner Institute, Potsdam, Germany
| | - J Santuber
- Digital Health Center, Hasso Plattner Institute, Potsdam, Germany
| | - J Edelman
- Digital Health Center, Hasso Plattner Institute, Potsdam, Germany
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Das PP, Datta A, Datta PG. Association of Allergic Rhinitis with Asthmatic Conditions: A Cross Sectional Study. Mymensingh Med J 2019; 28:914-919. [PMID: 31599260] [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: 06/10/2023]
Abstract
Allergic rhinitis is one of important risk factor for developing asthma and sometimes it appears before developing full-blown asthma in affected patients. This is a socially embarrassing condition for the patients. Current estimates are that allergy in one form or another affects some 30% or more of general population. Otolaryngologists may expect about 50% of patients encountered in their daily practice to have allergy as a major or at least a contributing cause of presenting problems. Allergy has been called "The great masquerader", because of its ability to mimic an immense variety of other conditions. Objective of the study is to determine the association of allergic rhinitis with asthma. This cross sectional study was conducted at Green Life Hospital, Dhaka, Bangladesh from January 2018 to July 2018. Ultimately 250 interested patients were enrolled in the study. 50.8% of the participants were male and 49.2% were female. Among the 250 allergic rhinitis patients 92% presented with nasal discharge, 64.8% presented with nasal blockade, 84% presented with bouts of sneezing, 27.6% presented with hyposmia, 8.8% presented with Ocular redness, 48.8% presented with headache, 18.0% presented with epistaxis. Among them 43.2% patients were previously diagnosed as asthma by competent physicians; 39.2% patients had previous history of breathlessness that relieved with asthma medication in last 12 months. At least more than one symptom like wheeze, shortness of breath, chest tightness and cough in last 12 months were experienced by 51.6% patients. Among the 250 patients 51.2% had Rhonchi on chest examination, 54.8% had some form of shortness of breath, 43.2% had chest tightness, 59.6% had dry cough during the time of history taking & physical examination. The current study found strong association between allergic rhinitis and asthma.
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Affiliation(s)
- P P Das
- Dr Partha Pratim Das, Associate Professor, Department of Medicine, Dhaka Medical College, Dhaka, Bangladesh; E-mail:
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Macharia MW, Tan WYZ, Das PP, Naqvi NI, Wong SM. Proximity-dependent biotinylation screening identifies NbHYPK as a novel interacting partner of ATG8 in plants. BMC Plant Biol 2019; 19:326. [PMID: 31324141 PMCID: PMC6642529 DOI: 10.1186/s12870-019-1930-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2019] [Accepted: 07/09/2019] [Indexed: 05/27/2023]
Abstract
BACKGROUND Autophagy is a conserved, highly-regulated catabolic process that plays important roles in growth, development and innate immunity in plants. In this study, we compared the rate of autophagy induction in Nicotiana benthamiana plants infected with Tobacco mosaic virus or the TMV 24A + UPD mutant variant, which replicates at a faster rate and induces more severe symptoms. Using a BirA* tag and proximity-dependent biotin identification (BioID) analysis, we identified host proteins that interact with the core autophagy protein, ATG8 in TMV 24A + UPD infected plants. By combining the use of a fast replicating TMV mutant and an in vivo protein-protein screening technique, we were able to gain functional insight into the role of autophagy in a compatible virus-host interaction. RESULTS Our study revealed an increased autophagic flux induced by TMV 24A + UPD, as compared to TMV in N. benthamiana. Analysis of the functional proteome associated with ATG8 revealed a total of 67 proteins, 16 of which are known to interact with ATG8 or its orthologs in mammalian and yeast systems. The interacting proteins were categorized into four functional groups: immune system process, response to ROS, sulphur amino acid metabolism and calcium signalling. Due to the presence of an ubiquitin-associated (UBA) domain, which is demonstrated to interact with ATG8, the Huntingtin-interacting protein K-like (HYPK) was selected for validation of the physical interaction and function. We used yeast two hybrid (Y2H), bimolecular fluorescence complementation (BiFC) and subcellular localization to validate the ATG8-HYPK interaction. Subsequent down-regulation of ATG8 by virus-induced gene silencing (VIGS) showed enhanced TMV symptoms, suggesting a protective role for autophagy during TMV 24A + UPD infection. CONCLUSION This study presents the use of BioID as a suitable method for screening ATG8 interacting proteins in planta. We have identified many putative binding partners of ATG8 during TMV 24A + UPD infection in N. benthamiana plants. In addition, we have verified that NbHYPK is an interacting partner of ATG8. We infer that autophagy plays a protective role in TMV 24A + UPD infected plants.
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Affiliation(s)
- Mercy W Macharia
- Department of Biological Sciences, National University of Singapore, Singapore, 119543, Singapore
| | - Wilfred Y Z Tan
- Department of Biological Sciences, National University of Singapore, Singapore, 119543, Singapore
| | - Prem P Das
- Department of Biological Sciences, National University of Singapore, Singapore, 119543, Singapore
| | - Naweed I Naqvi
- Department of Biological Sciences, National University of Singapore, Singapore, 119543, Singapore
- Temasek Life Sciences Laboratory, Singapore, 117604, Singapore
| | - Sek-Man Wong
- Department of Biological Sciences, National University of Singapore, Singapore, 119543, Singapore.
- Temasek Life Sciences Laboratory, Singapore, 117604, Singapore.
- National University of Singapore Research Institute, Suzhou, Jiangsu, 215123, People's Republic of China.
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7
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Das PP, Krishnan G, Doley J, Bhattacharya D, Deb SM, Chakravarty P, Das PJ. Establishing gene Amelogenin as sex-specific marker in yak by genomic approach. J Genet 2019; 98:7. [PMID: 30945688] [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: 06/09/2023]
Abstract
Yak, an economically important bovine species considered as lifeline of the Himalaya. Indeed, this gigantic bovine is neglected because of the scientific intervention for its conservation as well as research documentation for a long time. Amelogenin is an essential protein for tooth enamel which eutherian mammals contain two copies in both X and Y chromosome each. In bovine, the deletion of a fragment of the nucleotide sequence in Y chromosome copy of exon 6 made Amelogenin an excellent sex-specific marker. Thus, an attempt was made to use the gene as an advanced molecular marker of sexing of the yak to improve breeding strategies and reproduction. The present study confirmed that the polymerase chain reaction amplification of the Amelogenin gene with a unique primer is useful in sex identification of the yak. The test is further refined with qPCR validation by quantifying the DNA copy number of the Amelogenin gene in male and female. We observed a high level of sequence polymorphisms of AMELX and AMELY in yak considered as novel identification. These tests can be further extended into several other specialized fields including forensics, meat production and processing, and quality control.
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Affiliation(s)
- P P Das
- Indian Council of Agricultural Research-National Research Centre on Yak, Dirang 790 101, India. ,
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8
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van Genderen E, Clabbers MTB, Das PP, Stewart A, Nederlof I, Barentsen KC, Portillo Q, Pannu NS, Nicolopoulos S, Gruene T, Abrahams JP. Ab initio structure determination of nanocrystals of organic pharmaceutical compounds by electron diffraction at room temperature using a Timepix quantum area direct electron detector. Corrigendum. Acta Crystallogr A Found Adv 2018; 74:709. [PMID: 30378582 PMCID: PMC6207913 DOI: 10.1107/s2053273318014079] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 08/10/2018] [Accepted: 08/10/2018] [Indexed: 11/10/2022]
Abstract
Corrections are made to Table 1 in the article by van Genderen et al. [Acta Cryst. (2016), A72, 236-242].
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Affiliation(s)
- E van Genderen
- Biophysical Structural Chemistry, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands
| | - M T B Clabbers
- Biophysical Structural Chemistry, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands
| | - P P Das
- Nanomegas SPRL, Boulevard Edmond Machtens 79, B 1080, Brussels, Belgium
| | - A Stewart
- Department of Physics and Energy, Materials and Surface Science Institute (MSSI), University of Limerick, Limerick, Ireland
| | - I Nederlof
- Biophysical Structural Chemistry, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands
| | - K C Barentsen
- Biophysical Structural Chemistry, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands
| | - Q Portillo
- Nanomegas SPRL, Boulevard Edmond Machtens 79, B 1080, Brussels, Belgium
| | - N S Pannu
- Biophysical Structural Chemistry, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands
| | - S Nicolopoulos
- Nanomegas SPRL, Boulevard Edmond Machtens 79, B 1080, Brussels, Belgium
| | - T Gruene
- Biology and Chemistry, Laboratory of Biomolecular Research, Paul Scherrer Institute (PSI), 5232 Villigen, Switzerland
| | - J P Abrahams
- Biophysical Structural Chemistry, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands
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Datta A, Das PP, Ullah MM, Datta PG, Azad MS. Role of Computed Tomography in the Evaluation of Nasopharyngeal Mass. Mymensingh Med J 2017; 26:426-431. [PMID: 28588182] [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: 06/07/2023]
Abstract
In Indian subcontinent, all types of nasopharyngeal masses are rare. However, Nasopharyngeal carcinoma is not uncommon in Bangladesh. It is very important to differentiate malignant from benign lesions early in the disease process. In recent years, CT is the primary diagnostic screening modality for the detection of nasopharyngeal pathology. This cross sectional study was carried out in the Department of Radiology & Imaging, BSMMU in collaboration with Department of otolaryngology of the same hospital from July 2012 to June 2014. Sensitivity of CT scan in diagnosis of nasopharyngeal carcinoma was 100%, specificity was 93.10%, positive predictive value (PPV) was 93.94%, negative predictive value (NPV) was 100% and accuracy was 96.67%. Sensitivity of CT scan in diagnosis of benign angiofibroma was 78.26 %, specificity was 89.19%, positive predictive value (PPV) was 81.82%, negative predictive value (NPV) was 86.84% and accuracy was 85% of CT scan. CT scan findings of the present study correlated well in most of the cases with the histopathological evaluations. Considering the high validity parameter it can come to a conclusion that CT scan is as highly effective as histopathology in diagnosis of nasopharyngeal mass.
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Affiliation(s)
- A Datta
- Dr Anindita Datta, Assistant Professor, Department of Radiology & Imaging, Bangabandhu Sheikh Mujib Medical University (BSMMU), Dhaka, Bangladesh
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10
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van Genderen E, Clabbers MTB, Das PP, Stewart A, Nederlof I, Barentsen KC, Portillo Q, Pannu NS, Nicolopoulos S, Gruene T, Abrahams JP. Ab initio structure determination of nanocrystals of organic pharmaceutical compounds by electron diffraction at room temperature using a Timepix quantum area direct electron detector. Acta Crystallogr A Found Adv 2016; 72:236-42. [PMID: 26919375 PMCID: PMC4770873 DOI: 10.1107/s2053273315022500] [Citation(s) in RCA: 104] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/24/2015] [Accepted: 11/25/2015] [Indexed: 11/10/2022]
Abstract
A specialized quantum area detector for electron diffraction studies makes it possible to solve the structure of small organic compound nanocrystals in non-cryo conditions by direct methods. Until recently, structure determination by transmission electron microscopy of beam-sensitive three-dimensional nanocrystals required electron diffraction tomography data collection at liquid-nitrogen temperature, in order to reduce radiation damage. Here it is shown that the novel Timepix detector combines a high dynamic range with a very high signal-to-noise ratio and single-electron sensitivity, enabling ab initio phasing of beam-sensitive organic compounds. Low-dose electron diffraction data (∼0.013 e− Å−2 s−1) were collected at room temperature with the rotation method. It was ascertained that the data were of sufficient quality for structure solution using direct methods using software developed for X-ray crystallography (XDS, SHELX) and for electron crystallography (ADT3D/PETS, SIR2014).
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Affiliation(s)
- E van Genderen
- Biophysical Structural Chemistry, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands
| | - M T B Clabbers
- Biophysical Structural Chemistry, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands
| | - P P Das
- Nanomegas SPRL, Boulevard Edmond Machtens 79, B 1080, Brussels, Belgium
| | - A Stewart
- Department of Physics and Energy, Materials and Surface Science Institute (MSSI), University of Limerick, Limerick, Ireland
| | - I Nederlof
- Biophysical Structural Chemistry, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands
| | - K C Barentsen
- Biophysical Structural Chemistry, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands
| | - Q Portillo
- Nanomegas SPRL, Boulevard Edmond Machtens 79, B 1080, Brussels, Belgium
| | - N S Pannu
- Biophysical Structural Chemistry, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands
| | - S Nicolopoulos
- Nanomegas SPRL, Boulevard Edmond Machtens 79, B 1080, Brussels, Belgium
| | - T Gruene
- Biology and Chemistry, Laboratory of Biomolecular Research, Paul Scherrer Institute (PSI), 5232 Villigen, Switzerland
| | - J P Abrahams
- Biophysical Structural Chemistry, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands
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11
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Datta PG, Saha KL, Roy JS, Biswas AK, Das PP. Congenital absence of one tonsil without any other congenital abnormality: a rare presentation. Bangladesh Med Res Counc Bull 2012; 38:39-40. [PMID: 22545350 DOI: 10.3329/bmrcb.v38i1.10451] [Citation(s) in RCA: 1] [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: 11/05/2022]
Abstract
DOI: http://dx.doi.org/10.3329/bmrcb.v38i1.10451Bangladesh Med Res Counc Bull 2012; 38: 39-40
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Nath R, Saikia L, Choudhury G, Das PP. Isolation of Shewanella algae from rectal swabs of patients with bloody diarrhoea. Indian J Med Microbiol 2011; 29:422-5. [DOI: 10.4103/0255-0857.90186] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Datta PG, Hossain MD, Amin SA, Rahman MK, Das PP, Saha KL, Taous A, Biswas AK, Datta A. Tubercular lymphadenitis - diagnostic evaluation. Mymensingh Med J 2011; 20:233-237. [PMID: 21522093] [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: 05/30/2023]
Abstract
Tuberculosis is one the commonest disease affecting peripheral lymph node and cervical tubercular lymphadenitis are frequently encountered in Otolaryngological practice. Three hundred fifty six (356) cases of Fine Needle Aspiration for Cytology (FNAC) positive tubercular lymphadenitis were studied from January 2006 to December 2008. FNAC positive but histopathologically negative cases were excluded from the study. Among 356 cases of FNAC positive cervical lymphadenopathy 300 cases (84.27%) were confirmed tuberculosis on histopathological examination. Remaining 50 cases (15.73%) were diagnosed as nontubercular lymphadenitis where nonspecific lymphadenitis was the commonest finding 34(9.55%) followed by metastatic carcinoma 7(1.97%), lymphoma 6(1.08%), Kikuchiz's disease 6(1.08%), Kala-Azar 2(0.56%) & Leukemia 1(0.28%). Most of the patients presented with only multiple lymph node swelling with other symptoms, such as fever 18(5.06%), pain (15.7%), tenderness 53(14.88%), weight loss 29(8.14%), anorexia 33(9.26%). Following observations are evident from this study: i) Disease is comparatively common between 12-35 years ii) Multiple matted/discrete lymph nodes are the earliest presentation iii) Multiple lymph node is the most consistent finding for clinical diagnosis. iv) Very few patients have constitutional symptoms v) Suppuration with or without abscess formation although confirms the diagnosis even then certainty is very essential. Though the evidence of cervical tuberculosis was thought to be decreasing in developing countries the real picture seems to be different. Random survey among the whole population was not done in any country rather hospital based laboratory research was made.
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Affiliation(s)
- P G Datta
- Department of Otolaryngology & Head-Neck Surgery, Bangabandhu Sheikh Mujib Medical University, Dhaka, Bangladesh
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Abstract
To assess the damage caused by pesticides and their mixtures on humans, we designed in-vitro experiments to evaluate their cytotoxicity and genotoxicity. Three equimolar pesticide mixtures were investigated for their capability to affect cultured human peripheral blood lymphocytes. The LC50 values for cytotoxicity, using standard trypan blue dye exclusion and calculated by probit analysis, were 4.18, 5.76, and 7.5 microM for endosulfan, carbofuran, and monocrotophos, respectively. When combined in equimolar concentrations, the LC50 values for cytotoxicity were 0.7, 0.9, and 1.0 microM for monocrotophos + carbofuran, endosulfan + monocrotophos, and endosulfan + carbofuran, respectively, using the method. DNA damage was estimated using chromosomal aberrations (chromatid breaks, fragments, gaps, aneuploidy, and satellite association) and comet assays using 1/10 of the LC50 concentrations. Using a standard alkaline comet assay procedure, high concentrations of individual pesticides (0.5-4.0 microM) caused significant DNA damage as indicated by visible tail lengths. Lower concentrations (0.05-0.5 microM) of their binary mixtures could cause the same effect. The results suggest that analysis of genotoxicity may serve as an important biomarker for occupational and household exposure to pesticides, especially mixtures of pesticides, with different modes of action.
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Affiliation(s)
- P P Das
- Department of Genetics, Bhagwan Mahavir Medical Research Centre, Hyderabad, Andhra Pradesh, India
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Das PP, Grover S. Diagnostic stability: clinical v. research. Br J Psychiatry 2007; 191:265; author reply 265-6. [PMID: 17766774 DOI: 10.1192/bjp.191.3.265b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Devi VM, Das PP, Rao KN. Intercomparison of CO(2) and HCN wave numbers at 800-600 cm(-1) with a diode laser spectrometer. Appl Opt 1979; 18:2918-2919. [PMID: 20212778 DOI: 10.1364/ao.18.002918] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
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