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  1. Artikel ; Online: Unveiling N-Fused Nitreniums as Potent Catalytic Photooxidants.

    Rana, Samim Sohel / Choudhury, Joyanta

    Journal of the American Chemical Society

    2024  Band 146, Heft 6, Seite(n) 3603–3608

    Abstract: The first example of a hitherto-unknown facet of catalytic photooxidant capability of nitrenium cations is reported herein. The fundamental limitation of inability of the traditional and reported nitreniums to achieve the excited-state redox potential ... ...

    Abstract The first example of a hitherto-unknown facet of catalytic photooxidant capability of nitrenium cations is reported herein. The fundamental limitation of inability of the traditional and reported nitreniums to achieve the excited-state redox potential beyond +2.0 V (vs Ag/AgCl), the primary requirement for a powerful photooxidant, is addressed in this work by developing a structurally unique class of N-fused nitrenium cations, with the required structural engineering involving extensive π-conjugation through ring fusion at the nitrenium site, which enabled significant lowering of the LUMO energy and easy reduction at the excited state (excited-state redox potential up to +2.5 V vs Ag/AgCl), facilitated by effective delocalization/stabilization of the generated radical. This finding opens a new way to discover novel and useful (photo)catalytic properties of nitrenium cations beyond just Lewis acidity.
    Sprache Englisch
    Erscheinungsdatum 2024-01-31
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 3155-0
    ISSN 1520-5126 ; 0002-7863
    ISSN (online) 1520-5126
    ISSN 0002-7863
    DOI 10.1021/jacs.3c12606
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  2. Artikel ; Online: Orchestrated Octuple C-H Activation: A Bottom-Up Topology Engineering Approach toward Stimuli-Responsive Double-Heptagon-Embedded Wavy Polycyclic Heteroaromatics.

    Rana, Samim Sohel / Choudhury, Joyanta

    Angewandte Chemie (International ed. in English)

    2024  , Seite(n) e202406514

    Abstract: Curiosity-driven innovations on the design and synthesis of nonplanar polycyclic aromatic/heteroaromatic compounds with new molecular topologies unfold exciting opportunities for harnessing their intriguing supramolecular properties and thereby the ... ...

    Abstract Curiosity-driven innovations on the design and synthesis of nonplanar polycyclic aromatic/heteroaromatic compounds with new molecular topologies unfold exciting opportunities for harnessing their intriguing supramolecular properties and thereby the development of novel functional organic materials. This work presents such an innovative synthetic concept of a bottom-up molecular topology engineering through a unique orchestrated octuple C-H activation reaction, toward the rapid synthesis of a novel class of double heptagon-incorporated nitrogen-doped laterally-fused polycyclic compounds with rarely reported wavy structural configuration. The profound impact of the molecular wavy structures of these compounds on their properties is manifested by weak and tunable solid-state intermolecular interactions controlling the electronic properties of the materials, leading to reversibly switchable fluorochromism in the solid state and thin films with mechanical force and solvent vapors as external stimuli, thereby indicating their potential applicability in rewritable fluorescent optical recording media, security papers, mechanosensors, volatile organic compound (VOC) sensors etc.
    Sprache Englisch
    Erscheinungsdatum 2024-05-17
    Erscheinungsland Germany
    Dokumenttyp Journal Article
    ZDB-ID 2011836-3
    ISSN 1521-3773 ; 1433-7851
    ISSN (online) 1521-3773
    ISSN 1433-7851
    DOI 10.1002/anie.202406514
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  3. Konferenzbeitrag ; Online: Analysis of AEM data density and its optimization for mapping the network of water potential fractures in crystalline hard rock

    Choudhury, J. / Chandra, S.

    XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)

    2023  

    Abstract: The weathered zone in granitic hard rock, that use to facilitate potential zone for groundwater occurrence, goes mostly dry due to lowering of water level and as a result presence of underlying fractures and its interconnectivity becomes vital for ... ...

    Abstract The weathered zone in granitic hard rock, that use to facilitate potential zone for groundwater occurrence, goes mostly dry due to lowering of water level and as a result presence of underlying fractures and its interconnectivity becomes vital for groundwater prospecting in hard rock terrains. The bedrock fractures are known for sporadic and random distribution. The generating knowledge on the distribution of bedrock fracture pattern with limited data sets usually faces either underestimation or overestimation due to interpolation, which leads to inaccurate assessment of the aquifer dynamics. This paper presents a comparative analysis on degree of lithological variability and role of data density with special reference to granitic hard rock terrain. An integrated hydrogeophysical study including airborne electromagnetic (AEM) that measures at every 2.5-3 m along the flight lines has been carried out in a 380 sq.km granitic terrain in Tumkur district, Karnataka state of India. Previous studies has shown that AEM Depth of Investigation is very effective parameter in mapping of fracture network due to associated weathering and presence of water. We extend the work to establish the optimal data density required for mapping the network of fracture. We also present an analysis demonstrating how the information is getting lost or superficial information generated by changing the data density. A demonstrative exercise has been carried out by gradually decreasing data density from 100% to 0.05% and compared with general practices for groundwater application. This is helpful for conceptualization and planning of the aquifer mapping in hard rock terrains.
    Thema/Rubrik (Code) 550
    Sprache Englisch
    Erscheinungsdatum 2023-07-11
    Erscheinungsland de
    Dokumenttyp Konferenzbeitrag ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

    Volltext online

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  4. Artikel: Conformationally flexible heterohelicenes as stimuli-controlled soft molecular springs.

    Karak, Pirudhan / Choudhury, Joyanta

    Chemical science

    2022  Band 13, Heft 37, Seite(n) 11163–11173

    Abstract: Structurally engineered molecules which can behave as stimuli-controlled mechanical nanomachines such as molecular shuttles, rotors, ratchets, and springs are important in several research areas, including molecular robotics, actuation, sensing, cargo ... ...

    Abstract Structurally engineered molecules which can behave as stimuli-controlled mechanical nanomachines such as molecular shuttles, rotors, ratchets, and springs are important in several research areas, including molecular robotics, actuation, sensing, cargo transportation,
    Sprache Englisch
    Erscheinungsdatum 2022-09-01
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 2559110-1
    ISSN 2041-6539 ; 2041-6520
    ISSN (online) 2041-6539
    ISSN 2041-6520
    DOI 10.1039/d2sc04006a
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  5. Artikel ; Online: Proactive care post-discharge to reduce 30 day readmissions to hospital.

    Choudhury, J / Perrio, S / Scobell, M / Bertram, T / Gray, A

    The International journal of risk & safety in medicine

    2022  Band 33, Heft S1, Seite(n) S41–S45

    Abstract: Background: Healthwatch England estimated emergency readmissions have risen by 22.8% between 2012-13 and 2016-17. Some emergency readmissions could be avoided by providing patients with urgent out of hospital medical care or support. Sovereign Health ... ...

    Abstract Background: Healthwatch England estimated emergency readmissions have risen by 22.8% between 2012-13 and 2016-17. Some emergency readmissions could be avoided by providing patients with urgent out of hospital medical care or support. Sovereign Health Network (SHN) comprises of three GP practices, with a combined population of 38,000.
    Objective: We will decrease the number of SHN patients readmitted within 30 days of discharge from Portsmouth Hospitals Trust following a non-elective admission (excluding Emergency Department attendance) by 40-60% by July 2020.
    Methods: Four Plan, Do, Study, Act (PDSA) cycles were used to test the administrative and clinical processes. Our Advanced Nurse Practitioner reviewed all discharge summaries, added alerts to records, and proactively contacted patients either by text, telephone or home visit.
    Results: 92 patients aged 23 days to 97 years were admitted onto the recent discharge scheme. Half of discharge summaries were received on the day of discharge, whilst 29% of discharge summaries were received more than 24 hours post-discharge, and one was received 11 days post-discharge. Following our interventions, there were 55% less than expected readmissions during the same time period.
    Conclusion: To allow proactive interventions to be instigated in a timely manner, discharge summaries need to be received promptly. The average readmission length of stay following a non-elective admission is seven days. Our proactive interventions saved approximately 102.9 bed days, with potential savings of 1,775 bed days over a year. We feel the results from our model are promising and could be replicated by other Primary Care Networks to result in larger savings in bed days.
    Mesh-Begriff(e) Humans ; Patient Readmission ; Patient Discharge ; Length of Stay ; Aftercare ; Hospitals ; Retrospective Studies ; Emergency Service, Hospital
    Sprache Englisch
    Erscheinungsdatum 2022-07-22
    Erscheinungsland Netherlands
    Dokumenttyp Journal Article
    ZDB-ID 1055458-0
    ISSN 1878-6847 ; 0924-6479
    ISSN (online) 1878-6847
    ISSN 0924-6479
    DOI 10.3233/JRS-227022
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  6. Artikel ; Online: Angiodysplasia of the appendix: a diagnostic challenge and the importance of colonoscopy.

    Johnson, Obiajulu / Mackenzie, Naomi / Choudhury, Jamil / Furtado, Sanjay

    BMJ case reports

    2023  Band 16, Heft 12

    Abstract: The case report discusses the challenges in diagnosing gastrointestinal bleeding of unknown origin, with angiodysplasia (AD) of the appendix being a rare cause. The report presents a case of a man in his late 60s who presented with vomiting, diarrhoea ... ...

    Abstract The case report discusses the challenges in diagnosing gastrointestinal bleeding of unknown origin, with angiodysplasia (AD) of the appendix being a rare cause. The report presents a case of a man in his late 60s who presented with vomiting, diarrhoea and rectal bleeding. As a result of the bleeding, the patient developed a type II myocardial infarction (MI), which had to be simultaneously managed further complicating the diagnostic process. Despite a normal CT angiogram, ongoing bleeding led to suspicion of AD, which was diagnosed using colonoscopy with limited bowel preparation. The patient underwent an open appendicectomy and was found to have AD of the tip of the appendix as the cause of the bleeding. The case highlights the limitations of CT angiography in haemodynamically unstable patients and subsequent importance of colonoscopy with bowel preparation in diagnosing rare causes of bleeding, even with limited bowel preparation, and the potential life-threatening consequences of untreated AD.
    Mesh-Begriff(e) Humans ; Male ; Angiodysplasia/diagnosis ; Angiodysplasia/diagnostic imaging ; Appendix/diagnostic imaging ; Colonic Diseases/complications ; Colonoscopy ; Gastrointestinal Hemorrhage/diagnosis ; Aged
    Sprache Englisch
    Erscheinungsdatum 2023-12-12
    Erscheinungsland England
    Dokumenttyp Case Reports ; Journal Article
    ISSN 1757-790X
    ISSN (online) 1757-790X
    DOI 10.1136/bcr-2023-255498
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  7. Artikel ; Online: Exploiting the NADP

    Karak, Pirudhan / Mandal, Sanajit Kumar / Choudhury, Joyanta

    Journal of the American Chemical Society

    2023  Band 145, Heft 31, Seite(n) 17321–17328

    Abstract: Generation of clean energy in a viable manner demands efficient and sustainable catalysts. One prospective method of clean energy generation is the electrochemical hydrogen evolution reaction (HER). Over the years, various transition metal-based ... ...

    Abstract Generation of clean energy in a viable manner demands efficient and sustainable catalysts. One prospective method of clean energy generation is the electrochemical hydrogen evolution reaction (HER). Over the years, various transition metal-based complexes/polymeric organic materials were utilized in HER. However, the use of a redox-active small organic molecule as a catalyst for HER has not been explored well. The requirements of a strongly acidic solution, very high overpotential, and stability under acidic conditions pose several challenges for applying organic electrocatalysts for HER. Considering these challenges, herein, we demonstrated an NADP
    Sprache Englisch
    Erscheinungsdatum 2023-07-27
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 3155-0
    ISSN 1520-5126 ; 0002-7863
    ISSN (online) 1520-5126
    ISSN 0002-7863
    DOI 10.1021/jacs.3c04737
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  8. Artikel ; Online: Bis-Imidazolium-Embedded Heterohelicene: A Regenerable NADP

    Karak, Pirudhan / Mandal, Sanajit Kumar / Choudhury, Joyanta

    Journal of the American Chemical Society

    2023  Band 145, Heft 13, Seite(n) 7230–7241

    Abstract: Biomimetic NAD(P)H-type organic hydride donors have recently been advocated as potential candidates to act as metal-free catalysts for fuel-forming reactions such as the reduction of ... ...

    Abstract Biomimetic NAD(P)H-type organic hydride donors have recently been advocated as potential candidates to act as metal-free catalysts for fuel-forming reactions such as the reduction of CO
    Sprache Englisch
    Erscheinungsdatum 2023-03-21
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 3155-0
    ISSN 1520-5126 ; 0002-7863
    ISSN (online) 1520-5126
    ISSN 0002-7863
    DOI 10.1021/jacs.2c12883
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  9. Artikel ; Online: SAXS/WAXS data of conformationally flexible ribose binding protein.

    Choudhury, Jagrity / Yonezawa, Kento / Anu, Anu / Shimizu, Nobutaka / Chaudhuri, Barnali

    Data in brief

    2023  Band 52, Seite(n) 109932

    Abstract: Modern artificial intelligence-based protein structure prediction methods, such as Alphafold2, can predict structures of folded proteins with reasonable accuracy. However, Alphafold2 provides a static view of a protein, which does not show the ... ...

    Abstract Modern artificial intelligence-based protein structure prediction methods, such as Alphafold2, can predict structures of folded proteins with reasonable accuracy. However, Alphafold2 provides a static view of a protein, which does not show the conformational variability of the protein, domain movement in a multi-domain protein, or ligand-induced conformational changes it might undergo in solution. Small-angle X-ay scattering (SAXS) and wide-angle X-ray scattering (WAXS) are solution techniques that can aid in integrative modeling of conformationally flexible proteins, or in validating their predicted ensemble structures. While SAXS is sensitive to global structural features, WAXS can expand the scope of structural modeling by including information about local structural changes. We present SAXS and WAXS datasets obtained from conformationally flexible d-ribose binding protein (RBP) from
    Sprache Englisch
    Erscheinungsdatum 2023-12-09
    Erscheinungsland Netherlands
    Dokumenttyp Journal Article
    ZDB-ID 2786545-9
    ISSN 2352-3409 ; 2352-3409
    ISSN (online) 2352-3409
    ISSN 2352-3409
    DOI 10.1016/j.dib.2023.109932
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  10. Artikel: Primary Osseous Low-grade Myxofibrosarcoma of Metatarsal Masquerading as Enchondroma: A Case Report.

    Desai, Sanjay / Choudhury, Jayeta / Varghese, Kevin / Kapoor, Tushar

    Journal of orthopaedic case reports

    2022  Band 12, Heft 5, Seite(n) 35–39

    Abstract: Introduction: Low-grade myxofibrosarcoma (LGMFS) is a neoplasm of soft tissues. According to the World Health Organization, LGMFS is a malignant myofibroblastic tumor arising from deep soft tissues with potential for recurrence and late metastatic ... ...

    Abstract Introduction: Low-grade myxofibrosarcoma (LGMFS) is a neoplasm of soft tissues. According to the World Health Organization, LGMFS is a malignant myofibroblastic tumor arising from deep soft tissues with potential for recurrence and late metastatic spread. The incidence estimates are 0.18/million, accounting for 0.6% of all soft-tissue sarcomas. It can directly invade the bone and metastasize to bone; however, primary osseous low-grade myxofibrosarcoma is a rare entity. Thus, recognizing atypical presentations of uncommon neoplasms are a pertinent skill for the radiologist due to significant implications for management.
    Case report: A 40-year-old male with complaints of midfoot pain was referred to radiology department for imaging. Radiographs of the foot showed a lytic mildly expansile lesion in the first metacarpal with wide zone of transition and no sclerotic margin or matrix calcification. Magnetic resource imaging (MRI) and computed tomography (CT) examination demonstrated well defined lobulated lesion which appeared heterogeneously hyperintense on T2W images with cortical breach, extraosseous soft-tissue component, and early rapid progressive enhancement. The radiological diagnosis of enchondroma with pathological fracture was considered. Atypical findings of early progressive enhancement and extraosseous soft-tissue component were, however, incongruous with enchondroma and possibility of an aggressive/malignant etiology was also considered. Hence, the lesion was biopsied and diagnosis of LGMFS was made and subsequently confirmed on excised specimen. Follow-up CT scan post 6 months of surgical resection demonstrated no recurrence.
    Conclusion: Primary osseous LGMFS is a rare entity and radiologically mimics enchondromas. Both LGMFS and enchondromas show T2W hyperintensity. MRI features that distinguish LGMFS from enchondroma include low apparent diffusion coefficient values and slow progressive enhancement in dynamic contrast-enhanced MRI.
    Sprache Englisch
    Erscheinungsdatum 2022-06-14
    Erscheinungsland India
    Dokumenttyp Case Reports
    ZDB-ID 2658169-3
    ISSN 2250-0685
    ISSN 2250-0685
    DOI 10.13107/jocr.2022.v12.i05.2806
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