1
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Xu Y, Chen J, Aydt AP, Zhang L, Sergeyev I, Keeler EG, Choi B, He S, Reichman DR, Friesner RA, Nuckolls C, Steigerwald ML, Roy X, McDermott AE. Electron and Spin Delocalization in [Co 6 Se 8 (PEt 3 ) 6 ] 0/+1 Superatoms. Chemphyschem 2024; 25:e202300064. [PMID: 38057144 DOI: 10.1002/cphc.202300064] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2023] [Revised: 11/01/2023] [Indexed: 12/08/2023]
Abstract
Molecular clusters can function as nanoscale atoms/superatoms, assembling into superatomic solids, a new class of solid-state materials with designable properties through modifications on superatoms. To explore possibilities on diversifying building blocks, here we thoroughly studied one representative superatom, Co6 Se8 (PEt3 )6 . We probed its structural, electronic, and magnetic properties and revealed its detailed electronic structure as valence electrons delocalize over inorganic [Co6 Se8 ] core while ligands function as an insulated shell. 59 Co SSNMR measurements on the core and 31 P, 13 C on the ligands show that the neutral Co6 Se8 (PEt3 )6 is diamagnetic and symmetric, with all ligands magnetically equivalent. Quantum computations cross-validate NMR results and reveal degenerate delocalized HOMO orbitals, indicating aromaticity. Ligand substitution keeps the inorganic core nearly intact. After losing one electron, the unpaired electron in [Co6 Se8 (PEt3 )6 ]+1 is delocalized, causing paramagnetism and a delocalized electron spin. Notably, this feature of electron/spin delocalization over a large cluster is attractive for special single-electron devices.
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Affiliation(s)
- Yunyao Xu
- Department of Chemistry, Columbia University New York, New York, 10027, USA
| | - Jia Chen
- Department of Chemistry, Columbia University New York, New York, 10027, USA
| | - Alexander P Aydt
- Department of Chemistry, Columbia University New York, New York, 10027, USA
| | - Lichirui Zhang
- Department of Chemistry, Columbia University New York, New York, 10027, USA
| | - Ivan Sergeyev
- Department of Chemistry, Columbia University New York, New York, 10027, USA
| | - Eric G Keeler
- Department of Chemistry, Columbia University New York, New York, 10027, USA
| | - Bonnie Choi
- Department of Chemistry, Columbia University New York, New York, 10027, USA
| | - Shoushou He
- Department of Chemistry, Columbia University New York, New York, 10027, USA
| | - David R Reichman
- Department of Chemistry, Columbia University New York, New York, 10027, USA
| | - Richard A Friesner
- Department of Chemistry, Columbia University New York, New York, 10027, USA
| | - Colin Nuckolls
- Department of Chemistry, Columbia University New York, New York, 10027, USA
| | | | - Xavier Roy
- Department of Chemistry, Columbia University New York, New York, 10027, USA
| | - Ann E McDermott
- Department of Chemistry, Columbia University New York, New York, 10027, USA
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2
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Wang S, Choi B, Bai T, Zhong X, Avkshtol V, Moon DH, Parsons DDM, Sher DJ, Lin MH. Balancing Quality and Efficiency of Head and Neck Contour Revision for Online Adaptive Radiotherapy. Int J Radiat Oncol Biol Phys 2023; 117:e734-e735. [PMID: 37786135 DOI: 10.1016/j.ijrobp.2023.06.2259] [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: 10/04/2023]
Abstract
PURPOSE/OBJECTIVE(S) The number of target and organs-at-risk (OAR) structures requiring contours is a barrier to online adaptive radiotherapy (oART) implementation for head and neck (H&N) cancer. In sharing our experience utilizing a cone beam CT-based oART system featuring automatic contours, we analyzed the system's clinical performance and the dosimetric benefits of human supervision to investigate the optimal balance between contour editing and plan quality. MATERIALS/METHODS We analyzed 44 H&N patients and 349 adaptive fractions treated on the oART system. The unsupervised (automatically generated) and supervised (edited by clinicians) target and OAR contours as well as the corresponding adaptive plans were acquired. Dice Similarity Coefficient (DSC) and Hausdorff Distance (HD) used to assess the geometric extent of contour supervision. We mapped the clinically treated adaptive plan to the unsupervised contours to quantify the dosimetric effect of the contour edits, and the adaptive plan optimized from the unsupervised contours to the supervised contours to simulate an unsupervised workflow. RESULTS The targets were edited in >80.7% of the sessions, with the most changes seen in the primary GTV (DSC = 0.86 ± 0.09 and HD = 2.77 ± 1.58 mm) and the least in the nodal CTV (DSC = 0.92 ± 0.06, HD = 2.29 ± 1.49 mm). Among OARs, oral cavity was the most frequently edited (49.0%) and brainstem the least (2.2%). In general, OAR edits were minor (mean DSC > 0.95 with std Dosimetric quantification of the edits (Table 1) showed that while the unsupervised targets resulted in significant coverage loss, the change in unsupervised OAR dose was not as pronounced, with 81.5-96.8% still meeting the preplan constraints. Edits corresponding to major dose changes were mostly adjacent to or inside targets. The unsupervised workflow underdosed the targets and overdosed the OARs, and therefore is not recommended. CONCLUSION While target contours needed physician supervision in H&N oART, edits to automatic OAR contours were minor. An alternative contour workflow could be adopted to focus on the targets and reduce time spent on the OARs. For OAR close to or overlapping with the targets, strategic cropping could potentially minimize time for editing and improve the robustness of the adapted plan quality.
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Affiliation(s)
- S Wang
- Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, TX
| | - B Choi
- Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, TX
| | - T Bai
- Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, TX
| | - X Zhong
- Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, TX
| | - V Avkshtol
- University of Texas Southwestern Department of Radiation Oncology, Dallas, TX
| | - D H Moon
- University of Texas Southwestern Department of Radiation Oncology, Dallas, TX
| | - D D M Parsons
- Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, TX
| | - D J Sher
- Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, TX
| | - M H Lin
- Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, TX
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Jegatheeswaran L, Oungpasuk K, Choi B, Nakhoul M, Gokani S, Espehana A, Naing T, Burgan OT. Disposable versus reusable fibre-optic nasendoscopes: a national survey of UK ENT surgical trainees and a single-centre cost-analysis. J Laryngol Otol 2023; 137:866-872. [PMID: 36217672 DOI: 10.1017/s0022215122002274] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
BACKGROUND This study primarily assessed ENT surgical trainees' preferences for the qualities of disposable and reusable fibre-optic nasendoscopes. Secondary aims included eliciting trainees' views on ENT surgery and climate change, and creating a single-centre per-use cost analysis for disposable and reusable fibre-optic nasendoscopes. METHODS A cross-sectional study was formulated. An online survey consisting of multiple-choice and Likert-scale questions was distributed nationally. Cost analysis was performed using 2021-2022 data from the host institution. RESULTS Twenty-four trainees responded. Data on disposable fibre-optic nasendoscopes showed no difference in overall satisfaction (p = 0.244). Reusable fibre-optic nasendoscopes had a lower cost per use compared with disposable nasendoscopes at 5 years (4.7 per cent reduction) and 10 years (7.1 per cent reduction). Of the trainees, 79.2 per cent were supportive of climate-friendly initiatives within ENT surgery, and 25 per cent felt supported by their departments. CONCLUSION Trainees' satisfaction with disposable and reusable fibre-optic nasendoscopes is similar. Cost analysis favours reusable fibre-optic nasendoscopes in the long term at the host institution. Empowering departments and trainees to pursue climate-friendly initiatives should be encouraged.
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Affiliation(s)
- L Jegatheeswaran
- Department of ENT Surgery, Norfolk and Norwich University Hospitals NHS Foundation Trust, Norwich, UK
| | - K Oungpasuk
- Department of ENT Surgery, Imperial College Healthcare NHS Trust, St Mary's Hospital, London, UK
| | - B Choi
- Department of General Surgery, Ashford and St Peter's Hospitals NHS Foundation Trust, Guildford, UK
| | - M Nakhoul
- Department of Informatics and Analytics, Dana-Farber Cancer Institute, Boston, USA
| | - S Gokani
- Department of ENT Surgery, James Paget University Hospitals NHS Foundation Trust, Great Yarmouth, UK
| | - A Espehana
- Department of ENT Surgery, Norfolk and Norwich University Hospitals NHS Foundation Trust, Norwich, UK
| | - T Naing
- Department of ENT Surgery, Norfolk and Norwich University Hospitals NHS Foundation Trust, Norwich, UK
| | - O T Burgan
- Department of ENT Surgery, Norfolk and Norwich University Hospitals NHS Foundation Trust, Norwich, UK
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All S, Zhong X, Choi B, Kim J, Zhuang T, Avkshtol V, Sher D, Lin M, Moon D. Dosimetric Analysis of Online Adaptive Radiation Therapy in the Adjuvant Setting for Head and Neck Cancer. Int J Radiat Oncol Biol Phys 2022. [DOI: 10.1016/j.ijrobp.2022.07.650] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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5
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Choi B, Lee K, Jung G. Single Port Robotic Hysterectomy after the Previous Robotic Radical Trachelectomy. J Minim Invasive Gynecol 2022. [DOI: 10.1016/j.jmig.2022.09.242] [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: 11/25/2022]
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Zhao H, Meng B, Dohopolski M, Choi B, Liang X, Bai T, Nguyen D, Cai B, Lin M, Jiang S. Segmentation of Targets and Organs at Risk for CBCT-Based Online Adaptive Radiotherapy Using Recurrent Neural Networks: A Clinical Evaluation. Int J Radiat Oncol Biol Phys 2022. [DOI: 10.1016/j.ijrobp.2022.07.2197] [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: 11/29/2022]
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7
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Covas P, Liu B, Swamy S, Bourne M, Alafarj M, Cantlay C, Newman E, Sidahmed A, Bradley A, Choi B, Lichtenberger J, Zeman R, Katz R, Earls J, Choi A. 415 Canary In A Coal Mine In NSTEMI? AI-QCT Evaluation Of Atherosclerosis And 2-year Outcomes After CCTA. J Cardiovasc Comput Tomogr 2022. [DOI: 10.1016/j.jcct.2022.06.020] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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8
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Choi B, Choi H, Kim H, Choi A, Kwon S, Mouli S, Lewandowski R, Kim D. Abstract No. 332 Transcatheter intra-arterial local immunotherapy of hepatocellular carcinoma using high affinity anti-programmed cell death ligand-1 antibody-nanoconjugates. J Vasc Interv Radiol 2022. [DOI: 10.1016/j.jvir.2022.03.413] [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: 11/26/2022] Open
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9
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Choi B, Lee J, Kim H, Park S, Min B. Tissue Engineering, Embryonic, Organ and Other Tissue Specific Stem Cells: ANTI-INFLAMMATORY EFFECT OF HUMAN FETAL CARTILAGE-DERIVED PROGENITOR CELLS (HFCPCS) ON IL-1β-MEDIATED OSTEOARTHRITIS (OA) PHENOTYPES IN VITRO. Cytotherapy 2022. [DOI: 10.1016/s1465-3249(22)00404-2] [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: 11/03/2022]
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10
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Nam Y, Park S, Jeong S, Yum Y, Kim M, Park H, Lim J, Choi B, Jung S. Mesenchymal Stem/Stromal Cells: THERAPEUTIC POTENTIAL FOR PERIPHERAL NERVE REGENERATION OF SCHWANN CELL-LIKE CELLS DIFFERENTIATED FROM TONSIL- DERIVED MESENCHYMAL STEM CELLS IN C22 MICE. Cytotherapy 2022. [DOI: 10.1016/s1465-3249(22)00173-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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11
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Yoon SH, Choi B, Eun S, Bae GE, Koo CM, Kim MK. Using the lactate-to-albumin ratio to predict mortality in patients with sepsis or septic shock: a systematic review and meta-analysis. Eur Rev Med Pharmacol Sci 2022; 26:1743-1752. [PMID: 35302224 DOI: 10.26355/eurrev_202203_28244] [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: 06/14/2023]
Abstract
OBJECTIVE This study aimed to investigate whether the lactate-to-albumin ratio (LAR) can predict mortality in patients with sepsis or septic shock. PATIENTS AND METHODS A systematic search of the PubMed, EMBASE, Web of Science, and Google Scholar databases was conducted on December 16, 2021, for relevant articles that provided the predictive performance of LAR for mortality in patients with sepsis or septic shock. RESULTS Eight studies encompassing a total of 4,723 patients were included in this paper. The pooled sensitivity, specificity, and diagnostic odds ratio of the LAR for predicting mortality were 0.71 (95% confidence interval [CI]: 0.54-0.84), 0.68 (95% CI: 0.58-0.76) and 5.23 (95% CI: 2.62-10.45), respectively. The area under the summary receiver operating characteristic curve was 0.74 (95% CI: 0.70-0.78). CONCLUSIONS The current evidence suggests that LAR is moderately predictive of mortality among patients with sepsis or septic shock and may be beneficial to identify high-risk patients.
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Affiliation(s)
- S H Yoon
- Department of Pediatrics, Severance Children's Hospital, Yonsei University College of Medicine, Seoul, Korea.
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12
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Choi B, Fu H, Ogunmwonyi I, Gargan K. 225 First Contact: A Series of Zoom-Based, Virtual on Call Shifts. Br J Surg 2022. [DOI: 10.1093/bjs/znac039.141] [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: 11/13/2022]
Abstract
Abstract
Aim
COVID-19 has resulted in reduced exposure to on-call shifts where medical students could increase confidence and proficiency in task prioritisation and decision making. Existing ‘simulated on-calls’ provide a substitute in a controlled environment, however in person teaching has also been limited by COVID-19. Our virtual on-call sessions use ZOOM to replicate the higher-level learning experiences normally conferred by live simulation.
Method
We designed a series of virtual ‘on-calls’ for medical students. Participants were ‘on-call’, receiving ‘bleeps’ which were ‘answered’ by calling a facilitator via ZOOM. The facilitator would roleplay a scenario and the ‘Electronic Patient Record’ (EPR) on Google Forms contained patient notes and observations. Students needed to collect information from the facilitator and document a management plan into the EPR. Participants received ‘bleeps’ of varying complexity, urgency and relevance and were expected to prioritise and triage tasks accordingly. Evaluation was via a pre/post session quiz with separate feedback forms.
Results
23 students from 18 universities participated. Students reported increased confidence in managing on-call scenarios, and average scores improved in the post session quiz. Positive feedback was paid to the variety of scenarios, the EPR system and the feeling of realism elicited from the need to triage and prioritise jobs.
Conclusions
Our framework uses readily accessible technology to provide interactive learning experience. Feedback suggested students engaged in higher order learning and thinking, achieving our stated aims. We aim to incorporate technologies such as automation software which will allow for a scalable, free, and accessible virtual on call.
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Affiliation(s)
- B. Choi
- National Surgical Teaching Society, London, United Kingdom
| | - H. Fu
- National Surgical Teaching Society, London, United Kingdom
| | - I. Ogunmwonyi
- National Surgical Teaching Society, London, United Kingdom
| | - K. Gargan
- National Surgical Teaching Society, London, United Kingdom
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13
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Yablon LM, Sanders SN, Miyazaki K, Kumarasamy E, He G, Choi B, Ananth N, Sfeir MY, Campos LM. Singlet fission and triplet pair recombination in bipentacenes with a twist. Mater Horiz 2022; 9:462-470. [PMID: 34846410 DOI: 10.1039/d1mh01201k] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We investigate triplet pair dynamics in pentacene dimers that have varying degrees of coplanarity (pentacene-pentacene twist angle). The fine-tuning of the twist angle was achieved by alternating connectivity at the 1-position or 2-positions of pentacene. This mix-and-match connectivity leads to tunable twist angles between the two covalently linked pentacenes. These twisted dimers allow us to investigate the subtle effects that the dihedral angle between the covalently linked pentacenes imparts on singlet fission and triplet pair recombination dynamics. We observe that as the dihedral angle between the two bonded pentacenes is increased, the rates of singlet fission decrease, while the accompanying decrease in triplet recombination rates is stark. Temperature-dependent transient optical studies combined with theoretical calculations show that the triplet pair recombination proceeds primarily through a direct multiexciton internal conversion process. Calculations further show that the significant decrease in recombination rates can be directly attributed to a corresponding decrease in the magnitude of the nonadiabatic coupling between the singlet multiexcitonic state and the ground state. These results highlight the importance of the twist angle in designing systems that exhibit rapid singlet fission, while maintaining long triplet pair lifetimes in pentacene dimers.
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Affiliation(s)
- Lauren M Yablon
- Department of Chemistry, Columbia University, New York, New York 10027, USA.
| | - Samuel N Sanders
- Department of Chemistry, Columbia University, New York, New York 10027, USA.
| | - Ken Miyazaki
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, USA.
| | - Elango Kumarasamy
- Department of Chemistry, Columbia University, New York, New York 10027, USA.
| | - Guiying He
- Department of Physics, Graduate Center, City University of New York, New York, New York 10016, USA.
- Photonics Initiative, Advanced Science Research Center, City University of New York, New York, New York 10031, USA
| | - Bonnie Choi
- Department of Chemistry, Columbia University, New York, New York 10027, USA.
| | - Nandini Ananth
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, USA.
| | - Matthew Y Sfeir
- Department of Physics, Graduate Center, City University of New York, New York, New York 10016, USA.
- Photonics Initiative, Advanced Science Research Center, City University of New York, New York, New York 10031, USA
| | - Luis M Campos
- Department of Chemistry, Columbia University, New York, New York 10027, USA.
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Choi B, Lasica M, Huynh N, Sirdesai S, Nagarethinam M, Ting S, Cooke J, Hare J, Gibbs S. The Increasing Recognition of Transthyretin Cardiac Amyloidosis (ATTR-CA): Patient Characteristics and Survival in the Australian Context. Heart Lung Circ 2022. [DOI: 10.1016/j.hlc.2022.06.133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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15
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Jegatheeswaran L, Choi B, Rocha MF, Green A. 1426 Assessing the Impact Of COVID-19 On ENT Referrals at A West London General Practice. Br J Surg 2021. [DOI: 10.1093/bjs/znab259.570] [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: 11/14/2022]
Abstract
Abstract
Aim
The COVID-19 pandemic has resulted in initial GP consultations being conducted via telephone. This quality improvement initiative quantified this impact on ENT referrals conducted at a West London GP, using education to improve awareness of the relevant NICE guidance to reduce inappropriate referrals.
Method
An initial retrospective audit comparing number and urgency of ENT referrals and the appropriateness of ENT referrals (using NICE guidance) during the face to face (F2F) period (August 2019 – February 2020) and telephone period (March – September 2020) was performed. Results were presented locally to GPs, with education measures on relevant NICE guidance implemented. Further PDSA cycles occurred during October and November 2020.
Results
In total, 16 ENT referrals were made during the F2F period (routine n = 15; urgent n = 1); 3 were inappropriate. 31 referrals were made between March and September 2020 (routine n = 27, urgent n = 2, 2WW n = 2); 4 were inappropriate. Further cycles in October 2020, and November 2020 identified 13 referrals (routine n = 10, 2WW n = 3), and 2 referrals (routine n = 2) respectively. 1 inappropriate referral was made during October and none in November.
Conclusions
Locally, it appears that the number of routine referrals has increased since the advent of the initial lockdown. This may be partially explained by the practice losing the ability to perform some ENT services, such as ear wax micro-suctioning. Education to increase awareness of relevant guidance has been shown to reduce the number of inappropriate referrals to ENT services.
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Affiliation(s)
| | - B Choi
- Chelsea and Westminster NHS Foundation Trust, London, United Kingdom
| | - M F Rocha
- Imperial College Healthcare NHS Trust, London, United Kingdom
| | - A Green
- Imperial College Healthcare NHS Trust, London, United Kingdom
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16
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Choi B, Jegatheeswaran L, Platt E. 1372 Thrombocytosis and Malignancy: Management in Primary Care. Br J Surg 2021. [DOI: 10.1093/bjs/znab259.778] [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: 11/13/2022]
Abstract
Abstract
Introduction
The diagnosis of cancer relies within primary care to recognise this possibility in patients. Studies have shown an association of thrombocytosis with cancer, in particular lung, renal, uterine and colorectal cancer. Subsequently, suspected cancer pathways incorporate thrombocytosis in stratifying risk. This quality improvement project aimed to evaluate and improve the approach of GPs at a West London practice in managing thrombocytosis.
Method
A retrospective study evaluated patients with a most recent platelet count of > 450x109/L. Furthermore, a survey was sent to all GPs within the practice to establish their understanding and concerns. Results were presented locally, and intervention applied following the end of the first cycle.
Results
The survey showed 75% (n = 9) of staff were aware of the association of thrombocytosis and malignancy. In absence of specific symptoms, 64% would consider a chest X-ray, 41% a faecal occult blood test and 16% would consider transvaginal USS in women. 28 patients were identified with thrombocytosis. Of these, 4 had underlying malignancy, 3 had an underlying haematological condition. 2 cases had a concurrent inflammatory process. Of the remaining 19 patients, 5 were referred on for specialist service. In the remaining 14, although filed as “to repeat blood test” or “speak to doctor”, 12 had yet to be actioned.
Conclusions
The management of thrombocytosis at a local level in primary care has room for improvement. An alert was designed and created on the online system used by the practice to safeguard missed recalls for blood tests and prompts to consider the possibility of malignancy.
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Affiliation(s)
- B Choi
- Chelsea and Westminster NHS foundation trust, London, United Kingdom
| | | | - E Platt
- Sands End Health Clinic, London, United Kingdom
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Choi B, Jegatheeswaran L, Patel V, Lupi M, Babu E, Nakhoul M, Haria PL. 1389 Axillary Staging in Ductal Carcinoma in Situ with Microinvasion: A Systematic Review. Br J Surg 2021. [DOI: 10.1093/bjs/znab259.223] [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: 11/13/2022]
Abstract
Abstract
Introduction
Ductal carcinoma in situ with microinvasion (DCISM) is a rare subtype of DCIS, with a foci of tumour cells penetrating through the basement membrane. A conundrum for surgeons is that definitive diagnosis is made upon histological examination of the final specimen. In the UK, there are no specific guidelines on the role of axillary staging in the management of DCISM cases.
Method
A systematic review was conducted on the databases MEDLINE and Embase using the keywords: breast, DCISM, microinvasion, “ductal carcinoma in situ with microinvasion”, sentinel lymph node biopsy, SLNB, axillary staging was performed. 23 studies were selected for analysis. Primary outcome was the positivity of lymph node metastases; secondary outcome looked at characteristics of DCISM that may affect node positivity.
Results
2959 patients were included. Significant heterogeneity was observed amongst the studies with regards to metastases (I2=61%; P < 0.01). Lymph node macrometastases was estimated to be 2%. Significant subgroup difference was not observed between SLNB technique and lymph node macrometastases (Q = 0.74; p = 0.69). Statistical significance was observed between the focality of the DCISM and lymph node macrometastases (Q = 8.71; p = 0.033).
Conclusions
DCISM is not linked with higher rates of clinically significant metastasis to axillary lymph nodes. Survival rates are very similar to those seen in cases of DCIS. Current evidence suggests that axillary staging in cases of DCISM will not change their overall management. A conscientious multidisciplinary team approach evaluating pre-operative clinical and histological information to tailor the management specific to individual cases of DCISM would be a preferred approach than routine axillary staging.
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Affiliation(s)
- B Choi
- Chelsea and Westminster NHS Foundation Trust, London, United Kingdom
| | | | - V Patel
- Hillingdon Hospital NHS Foundation Trust, London, United Kingdom
| | - M Lupi
- Hillingdon Hospital NHS Foundation trust, London, United Kingdom
| | - E Babu
- Hillingdon Hospital NHS Foundation Trust, London, United Kingdom
| | - M Nakhoul
- Hillingdon Hospital NHS Foundation Trust, London, United Kingdom
| | - P l Haria
- Hillingdon Hospital NHS Foundation Trust, London, United Kingdom
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Adler C, Ahammed Z, Allgower C, Amonett J, Anderson BD, Anderson M, Averichev GS, Balewski J, Barannikova O, Barnby LS, Baudot J, Bekele S, Belaga VV, Bellwied R, Berger J, Bichsel H, Billmeier A, Bland LC, Blyth CO, Bonner BE, Boucham A, Brandin A, Bravar A, Cadman RV, Caines H, Calderón de la Barca Sánchez M, Cardenas A, Carroll J, Castillo J, Castro M, Cebra D, Chaloupka P, Chattopadhyay S, Chen Y, Chernenko SP, Cherney M, Chikanian A, Choi B, Christie W, Coffin JP, Cormier TM, Cramer JG, Crawford HJ, Csanád M, Deng WS, Derevschikov AA, Didenko L, Dietel T, Draper JE, Dunin VB, Dunlop JC, Eckardt V, Efimov LG, Emelianov V, Engelage J, Eppley G, Erazmus B, Fachini P, Faine V, Filimonov K, Finch E, Fisyak Y, Flierl D, Foley KJ, Fu J, Gagliardi CA, Gagunashvili N, Gans J, Gaudichet L, Germain M, Geurts F, Ghazikhanian V, Grachov O, Grigoriev V, Guedon M, Gushin E, Hallman TJ, Hardtke D, Harris JW, Henry TW, Heppelmann S, Herston T, Hippolyte B, Hirsch A, Hjort E, Hoffmann GW, Horsley M, Huang HZ, Humanic TJ, Igo G, Ishihara A, Ivanshin YI, Jacobs P, Jacobs WW, Janik M, Johnson I, Jones PG, Judd EG, Kaneta M, Kaplan M, Keane D, Kiryluk J, Kisiel A, Klay J, Klein SR, Klyachko A, Konstantinov AS, Kopytine M, Kotchenda L, Kovalenko AD, Kramer M, Kravtsov P, Krueger K, Kuhn C, Kulikov AI, Kunde GJ, Kunz CL, Kutuev RK, Kuznetsov AA, Lakehal-Ayat L, Lamont MAC, Landgraf JM, Lange S, Lansdell CP, Lasiuk B, Laue F, Lebedev A, Lednický R, Leontiev VM, LeVine MJ, Li Q, Lindenbaum SJ, Lisa MA, Liu F, Liu L, Liu Z, Liu QJ, Ljubicic T, Llope WJ, LoCurto G, Long H, Longacre RS, Lopez-Noriega M, Love WA, Ludlam T, Lynn D, Ma J, Ma R, Majka R, Margetis S, Markert C, Martin L, Marx J, Matis HS, Matulenko YA, McShane TS, Meissner F, Melnick Y, Meschanin A, Messer M, Miller ML, Milosevich Z, Minaev NG, Mitchell J, Moiseenko VA, Moore CF, Morozov V, de Moura MM, Munhoz MG, Nelson JM, Nevski P, Niida T, Nikitin VA, Nogach LV, Norman B, Nurushev SB, Odyniec G, Ogawa A, Okorokov V, Oldenburg M, Olson D, Paic G, Pandey SU, Panebratsev Y, Panitkin SY, Pavlinov AI, Pawlak T, Perevoztchikov V, Peryt W, Petrov VA, Planinic M, Pluta J, Porile N, Porter J, Poskanzer AM, Potrebenikova E, Prindle D, Pruneau C, Putschke J, Rai G, Rakness G, Ravel O, Ray RL, Razin SV, Reichhold D, Reid JG, Retiere F, Ridiger A, Ritter HG, Roberts JB, Rogachevski OV, Romero JL, Rose A, Roy C, Rykov V, Sakrejda I, Salur S, Sandweiss J, Saulys AC, Savin I, Schambach J, Scharenberg RP, Schmitz N, Schroeder LS, Schüttauf A, Schweda K, Seger J, Seliverstov D, Seyboth P, Shahaliev E, Shestermanov KE, Shimanskii SS, Shvetcov VS, Skoro G, Smirnov N, Snellings R, Sorensen P, Sowinski J, Spinka HM, Srivastava B, Stephenson EJ, Stock R, Stolpovsky A, Strikhanov M, Stringfellow B, Struck C, Suaide AAP, Sugarbaker E, Suire C, Šumbera M, Surrow B, Symons TJM, Szanto de Toledo A, Szarwas P, Tai A, Takahashi J, Tang AH, Thomas JH, Thompson M, Tikhomirov V, Todoroki T, Tokarev M, Tonjes MB, Trainor TA, Trentalange S, Tribble RE, Trofimov V, Tsai O, Ullrich T, Underwood DG, Van Buren G, VanderMolen AM, Vasilevski IM, Vasiliev AN, Vigdor SE, Voloshin SA, Wang F, Ward H, Watson JW, Wells R, Westfall GD, Whitten C, Wieman H, Willson R, Wissink SW, Witt R, Wood J, Xu N, Xu Z, Yakutin AE, Yamamoto E, Yang J, Yepes P, Yurevich VI, Zanevski YV, Zborovský I, Zhang H, Zhang WM, Zoulkarneev R, Zubarev AN. Erratum: Azimuthal Anisotropy of K_{S}^{0} and Λ+Λ[over ¯] Production at Midrapidity from Au+Au Collisions at sqrt[s]_{NN}=130 GeV [Phys. Rev. Lett. 89, 132301 (2002)]. Phys Rev Lett 2021; 127:089901. [PMID: 34477449 DOI: 10.1103/physrevlett.127.089901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Indexed: 06/13/2023]
Abstract
This corrects the article DOI: 10.1103/PhysRevLett.89.132301.
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Adams J, Adler C, Aggarwal MM, Ahammed Z, Amonett J, Anderson BD, Anderson M, Arkhipkin D, Averichev GS, Badyal SK, Balewski J, Barannikova O, Barnby LS, Baudot J, Bekele S, Belaga VV, Bellwied R, Berger J, Bezverkhny BI, Bhardwaj S, Bhaskar P, Bhati AK, Bichsel H, Billmeier A, Bland LC, Blyth CO, Bonner BE, Botje M, Boucham A, Brandin A, Bravar A, Cadman RV, Cai XZ, Caines H, Calderón de la Barca Sánchez M, Carroll J, Castillo J, Castro M, Cebra D, Chaloupka P, Chattopadhyay S, Chen HF, Chen Y, Chernenko SP, Cherney M, Chikanian A, Choi B, Christie W, Coffin JP, Cormier TM, Cramer JG, Crawford HJ, Csanád M, Das D, Das S, Derevschikov AA, Didenko L, Dietel T, Dong WJ, Dong X, Draper JE, Du F, Dubey AK, Dunin VB, Dunlop JC, Dutta Majumdar MR, Eckardt V, Efimov LG, Emelianov V, Engelage J, Eppley G, Erazmus B, Estienne M, Fachini P, Faine V, Faivre J, Fatemi R, Filimonov K, Filip P, Finch E, Fisyak Y, Flierl D, Foley KJ, Fu J, Gagliardi CA, Gagunashvili N, Gans J, Ganti MS, Gaudichet L, Germain M, Geurts F, Ghazikhanian V, Ghosh P, Gonzalez JE, Grachov O, Grigoriev V, Gronstal S, Grosnick D, Guedon M, Guertin SM, Gupta A, Gushin E, Gutierrez TD, Hallman TJ, Hardtke D, Harris JW, Heinz M, Henry TW, Heppelmann S, Herston T, Hippolyte B, Hirsch A, Hjort E, Hoffmann GW, Horsley M, Huang HZ, Huang SL, Humanic TJ, Igo G, Ishihara A, Jacobs P, Jacobs WW, Janik M, Jiang H, Johnson I, Jones PG, Judd EG, Kabana S, Kaneta M, Kaplan M, Keane D, Khodyrev VY, Kiryluk J, Kisiel A, Klay J, Klein SR, Klyachko A, Koetke DD, Kollegger T, Kopytine M, Kotchenda L, Kovalenko AD, Kramer M, Kravtsov P, Kravtsov VI, Krueger K, Kuhn C, Kulikov AI, Kumar A, Kunde GJ, Kunz CL, Kutuev RK, Kuznetsov AA, Lamont MAC, Landgraf JM, Lange S, Lansdell CP, Lasiuk B, Laue F, Lauret J, Lebedev A, Lednický R, LeVine MJ, Li C, Li Q, Lindenbaum SJ, Lisa MA, Liu F, Liu L, Liu Z, Liu QJ, Ljubicic T, Llope WJ, Long H, Longacre RS, Lopez-Noriega M, Love WA, Ludlam T, Lynn D, Ma J, Ma R, Ma YG, Magestro D, Mahajan S, Mangotra LK, Mahapatra DP, Majka R, Manweiler R, Margetis S, Markert C, Martin L, Marx J, Matis HS, Matulenko YA, McShane TS, Meissner F, Melnick Y, Meschanin A, Messer M, Miller ML, Milosevich Z, Minaev NG, Mironov C, Mishra D, Mitchell J, Mohanty B, Molnar L, Moore CF, Mora-Corral MJ, Morozov DA, Morozov V, de Moura MM, Munhoz MG, Nandi BK, Nayak SK, Nayak TK, Nelson JM, Nevski P, Niida T, Nikitin VA, Nogach LV, Norman B, Nurushev SB, Odyniec G, Ogawa A, Okorokov V, Oldenburg M, Olson D, Paic G, Pandey SU, Pal SK, Panebratsev Y, Panitkin SY, Pavlinov AI, Pawlak T, Perevoztchikov V, Perkins C, Peryt W, Petrov VA, Phatak SC, Picha R, Planinic M, Pluta J, Porile N, Porter J, Poskanzer AM, Potekhin M, Potrebenikova E, Potukuchi BVKS, Prindle D, Pruneau C, Putschke J, Rai G, Rakness G, Raniwala R, Raniwala S, Ravel O, Ray RL, Razin SV, Reichhold D, Reid JG, Renault G, Retiere F, Ridiger A, Ritter HG, Roberts JB, Rogachevski OV, Romero JL, Rose A, Roy C, Ruan LJ, Sahoo R, Sakrejda I, Salur S, Sandweiss J, Savin I, Schambach J, Scharenberg RP, Schmitz N, Schroeder LS, Schweda K, Seger J, Seliverstov D, Seyboth P, Shahaliev E, Shao M, Sharma M, Shestermanov KE, Shimanskii SS, Singaraju RN, Simon F, Skoro G, Smirnov N, Snellings R, Sood G, Sorensen P, Sowinski J, Spinka HM, Srivastava B, Stanislaus S, Stock R, Stolpovsky A, Strikhanov M, Stringfellow B, Struck C, Suaide AAP, Sugarbaker E, Suire C, Šumbera M, Surrow B, Symons TJM, Szanto de Toledo A, Szarwas P, Tai A, Takahashi J, Tang AH, Thein D, Thomas JH, Tikhomirov V, Todoroki T, Tokarev M, Tonjes MB, Trainor TA, Trentalange S, Tribble RE, Trivedi MD, Trofimov V, Tsai O, Ullrich T, Underwood DG, Van Buren G, VanderMolen AM, Vasiliev AN, Vasiliev M, Vigdor SE, Viyogi YP, Voloshin SA, Waggoner W, Wang F, Wang G, Wang XL, Wang ZM, Ward H, Watson JW, Wells R, Westfall GD, Whitten C, Wieman H, Willson R, Wissink SW, Witt R, Wood J, Wu J, Xu N, Xu Z, Xu ZZ, Yamamoto E, Yepes P, Yurevich VI, Zanevski YV, Zborovský I, Zhang H, Zhang WM, Zhang ZP, Żołnierczuk PA, Zoulkarneev R, Zoulkarneeva J, Zubarev AN. Erratum: Azimuthal Anisotropy at the Relativistic Heavy Ion Collider: The First and Fourth Harmonics [Phys. Rev. Lett. 92, 062301 (2004)]. Phys Rev Lett 2021; 127:069901. [PMID: 34420354 DOI: 10.1103/physrevlett.127.069901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Indexed: 06/13/2023]
Abstract
This corrects the article DOI: 10.1103/PhysRevLett.92.062301.
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Pei CZ, Park HB, Choi HS, Choi B, Park HY, Jung HY, Baek KH. P–370 RPL-protease A as a potential biomarker for predicting recurrent pregnancy loss. Hum Reprod 2021. [DOI: 10.1093/humrep/deab130.369] [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: 11/13/2022] Open
Abstract
Abstract
Study question
Could the reduction of RPL-protease A be involved in the dysfunctional trophoblast for resulting in recurrent pregnancy loss (RPL).
Summary answer
Low expression of RPL-protease A may result in RPL and low serum RPL-protease A level may be a potential biomarker for predicting RPL.
What is known already
The RPL-protease A is expressed and secreted by placenta. The RPL-protease A is involved in the pathogenesis of pre-eclampsia, and the serum RPL-protease A level is higher in the patients with pre-eclampsia than that of normal groups. In our previous study, we identified that the RPL-protease A mRNA level was lower in the villi of patients with RPL than that of normal groups.
Study design, size, duration
Using the CRISPR/Cas9 system, the RPL-protease A gene knockout BeWo cell (BeWo KO) line was established, and the wild type (BeWo WT) and BeWo KO cells were applied to investigate the roles of RPL-protease A in trophoblasts. The human serum RPL-protease A levels were investigated by Western blot analysis and ELISA kit.
Participants/materials, setting, methods
The cell-cell fusion, cell counting analysis, invasion and scratch wound assays, cell cycle analysis, and immunocytochemical analysis were used to investigate cellular functions of RPL-protease A in trophoblast. The sera were obtained from 32 normal pregnant women and 60 women with RPL. The Western blot analysis and ELISA were used for detection of serum RPL-protease A levels.
Main results and the role of chance
The β-hCG was detected in fused BeWo WT cells, while the BeWo KO cells cannot fuse and did not express the β-hCG. The ability of invasion was decreased, but the capacity of migration and proliferation was higher in BeWo KO cells than BeWo WT cells. Cell fusion related factor (β-hCG), and cell invasion related factors (MMP–2 and MMP–9) were highly expressed in BeWo WT cells, and cell related factor (FAK), and cell proliferation related factors (ERK, p38, JNK, MKK3, MKK6, Raf, and Ras) were highly expressed in BeWo KO cells. The Western blot analysis and ELISA indicate that the serum RPL-protease A level was decreased in patients with RPL compared to that of normal groups.
Limitations, reasons for caution
The results of this study have the limitation of RPL-protease A functions in vitro.
Wider implications of the findings: The cellular functions of RPL-protease A in trophoblasts were investigated to explain the pathogenesis of RPL, and low serum RPL-protease A level can be used for a potential biomarker predicting RPL.
Trial registration number
Not applicable
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Affiliation(s)
- C Z Pei
- CHA University, Department of Biomedical Science, Seongnam-Si Gyeonggi-Do, Korea- South
| | - H B Park
- CHA University, Department of Biomedical Science, Seongnam-Si Gyeonggi-Do, Korea- South
| | - H S Choi
- CHA University, Department of Biomedical Science, Seongnam-Si Gyeonggi-Do, Korea- South
| | - B Choi
- Creation and Love Women’s Hospital, Department of Obstetrics and Gynecology, Gwangju, Korea- South
| | - H Y Park
- Creation and Love Women’s Hospital, Department of Obstetrics and Gynecology, Gwangju, Korea- South
| | - H Y Jung
- Creation and Love Women’s Hospital, Department of Obstetrics and Gynecology, Gwangju, Korea- South
| | - K H Baek
- CHA University, Department of Biomedical Science, Seongnam-Si Gyeonggi-Do, Korea- South
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21
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Covas P, Liu B, Newman E, Jennings R, Crabtree T, Min J, Krepp J, Choi B, Lewis J, Reiner J, Katz R, Earls J, Choi A. Artificial Intelligence Guided Evaluation Of Atherosclerosis And Vessel Morphology In Non-ST Elevation Myocardial Infarction From Cardiac Computed Tomography (AI NSTEMI-CCTA). J Cardiovasc Comput Tomogr 2021. [DOI: 10.1016/j.jcct.2021.06.165] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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22
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Choi B, Messika J, Courtwright A, Mornex J, Hirschi S, Roux A, Le Pavec J, Quêtant S, Froidure A, Lazor R, Reynaud-Gaubert M, Le Borgne A, Goldberg H, El-Chemaly S, Borie R. Airway Complications in Lung Transplant Recipients with Telomere-Related Interstitial Lung Disease. J Heart Lung Transplant 2021. [DOI: 10.1016/j.healun.2021.01.473] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
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Wang M, Chu F, Xiao J, Choi B, Wei X, Feng A. Templated Polymerization of Nucleobase Complexes via Molecular Recognition. Macromol Rapid Commun 2020; 41:e2000352. [PMID: 32830372 DOI: 10.1002/marc.202000352] [Citation(s) in RCA: 1] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Indexed: 11/10/2022]
Abstract
Macromolecules have a strong tendency to interact with each other in solution to form a supramolecular structure through various secondary binding forces. In this study, nucleobase-containing templates poly(9-(4-vinylbenzyl)adenine) (PS AH) and poly(1-(4-vinylbenzyl)cytosine) (PS CH) are prepared by reversible addition-fragmentation chain transfer (RAFT) polymerization. Vinylbenzyl thymine (MS T) is polymerized in the presence of these two nucleobase-containing templates. MS T shows higher affinities toward the template PS AH compared with the template PS CH. In accordance with the Watson-Crick pairing principle, thymine forms hydrogen bonding (H-bonding) with adenine, but not between thymine and cytosine. A complex is formed when PS AH is used as template which indicates that there is a template polymerization of nucleobase complexes via molecular recognition.
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Affiliation(s)
- Mu Wang
- Sinopec Research Institute of Petroleum Engineering, Beijing, 100101, China
| | - Fuke Chu
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Jingjing Xiao
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Bonnie Choi
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Xiaohu Wei
- State Key Laboratory of Special Functional Waterproof Materials, Beijing Oriental Yuhong Waterproof Technology Co., Ltd, Beijing, 100123, China
| | - Anchao Feng
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, China
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Sun Z, Wang M, Li Z, Choi B, Mulder RJ, Feng A, Moad G, Thang SH. Versatile Approach for Preparing PVC-Based Mikto-Arm Star Additives Based on RAFT Polymerization. Macromolecules 2020. [DOI: 10.1021/acs.macromol.0c00125] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Zhonghe Sun
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education School of Chemistry, Beihang University, Beijing 100191, China
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
- Commonwealth Scientific and Industrial Research Organization (CSIRO) Manufacturing, Clayton, Victoria 3168, Australia
| | - Mu Wang
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
- Sinopec Research Institute of Petroleum Engineering, Beijing 100101, China
| | - Zhi Li
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Bonnie Choi
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Roger J. Mulder
- Commonwealth Scientific and Industrial Research Organization (CSIRO) Manufacturing, Clayton, Victoria 3168, Australia
| | - Anchao Feng
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Graeme Moad
- Commonwealth Scientific and Industrial Research Organization (CSIRO) Manufacturing, Clayton, Victoria 3168, Australia
| | - San H. Thang
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
- Commonwealth Scientific and Industrial Research Organization (CSIRO) Manufacturing, Clayton, Victoria 3168, Australia
- School of Chemistry, Monash University, Clayton Campus, Clayton, Victoria 3800, Australia
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25
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Choi B, Lee J, Truong M, Kim H, Yang S, Min B. Regeneration of cartilage defect using an artificial engineered cartilage with an injectable property. Cytotherapy 2020. [DOI: 10.1016/j.jcyt.2020.03.359] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Choi B, Jung H, Yu B, Choi H, Lee J, Kim D. Abstract No. 712 Sequential magnetic resonance imaging image-guided local immune checkpoint blockade immunotherapy using multifunctional carriers with cabazitaxel chemotherapy for the treatment of prostate cancer. J Vasc Interv Radiol 2020. [DOI: 10.1016/j.jvir.2019.12.771] [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: 11/29/2022] Open
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27
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Choi B, Lasica M, Hare J, Chong S, Strachan L, Hocking J, Ting S, Gibbs S. 105 Diflunisal is Effective and Affordable Treatment in Transthyretin Cardiac Amyloidosis (ATTR-CM) - but Only Half of Patients can Tolerate It. Heart Lung Circ 2020. [DOI: 10.1016/j.hlc.2020.09.112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Guo X, Zhang T, Wu Y, Shi W, Choi B, Feng A, Thang SH. Synthesis of CO 2-responsive gradient copolymers by switchable RAFT polymerization and their controlled self-assembly. Polym Chem 2020. [DOI: 10.1039/d0py01109f] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Switchable RAFT agents, so-called because they can be reversibly switched by an acid/base stimulus to offer very good control over polymerization of both MAMs and LAMs, provide a route to prepare well-defined polyMAM-block-polyLAM copolymers.
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Affiliation(s)
- Xiaofeng Guo
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering
- College of Materials Science and Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- China
| | - Tianren Zhang
- The Experimental High School Attached to Beijing Normal University
- Beijing
- China
| | - Yuetong Wu
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering
- College of Materials Science and Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- China
| | - Wencheng Shi
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering
- College of Materials Science and Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- China
| | - Bonnie Choi
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering
- College of Materials Science and Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- China
| | - Anchao Feng
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering
- College of Materials Science and Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- China
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Choi B, Lasica M, Hare J, Chong S, Strachan L, Hocking J, Ting S, Gibbs S. 178 “The Giant Awakes” – Rapid Increases in the Diagnosis of Transthyretin (TTR) Amyloidosis After the ATTR-ACT Trial of Tafamidis. Heart Lung Circ 2020. [DOI: 10.1016/j.hlc.2020.09.185] [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: 11/25/2022]
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Lee K, Maehrlein SF, Zhong X, Meggiolaro D, Russell JC, Reed DA, Choi B, De Angelis F, Roy X, Zhu X. Hierarchical Coherent Phonons in a Superatomic Semiconductor. Adv Mater 2019; 31:e1903209. [PMID: 31342595 DOI: 10.1002/adma.201903209] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2019] [Revised: 06/25/2019] [Indexed: 06/10/2023]
Abstract
The coupling of phonons to electrons and other phonons plays a defining role in material properties, such as charge and energy transport, light emission, and superconductivity. In atomic solids, phonons are delocalized over the 3D lattice, in contrast to molecular solids where localized vibrations dominate. Here, a hierarchical semiconductor that expands the phonon space by combining localized 0D modes with delocalized 2D and 3D modes is described. This material consists of superatomic building blocks (Re6 Se8 ) covalently linked into 2D sheets that are stacked into a layered van der Waals lattice. Using transient reflectance spectroscopy, three types of coherent phonons are identified: localized 0D breathing modes of isolated superatom, 2D synchronized twisting of superatoms in layers, and 3D acoustic interlayer deformation. These phonons are coupled to the electronic degrees of freedom to varying extents. The presence of local phonon modes in an extended crystal opens the door to controlling material properties from hierarchical phonon engineering.
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Affiliation(s)
- Kihong Lee
- Department of Chemistry, Columbia University, New York, NY, 10027, USA
| | | | - Xinjue Zhong
- Department of Chemistry, Columbia University, New York, NY, 10027, USA
| | - Daniele Meggiolaro
- Computational Laboratory for Hybrid/Organic Photovoltaics (CLHYO), CNR-ISTM, Via Elce di Sotto 8, I-06123, Perugia, Italy
- D3-CompuNet, Istituto Italiano di Tecnologia, Via Morego 30, 16163, Genova, Italy
| | - Jake C Russell
- Department of Chemistry, Columbia University, New York, NY, 10027, USA
| | - Douglas A Reed
- Department of Chemistry, Columbia University, New York, NY, 10027, USA
| | - Bonnie Choi
- Department of Chemistry, Columbia University, New York, NY, 10027, USA
| | - Filippo De Angelis
- Computational Laboratory for Hybrid/Organic Photovoltaics (CLHYO), CNR-ISTM, Via Elce di Sotto 8, I-06123, Perugia, Italy
- D3-CompuNet, Istituto Italiano di Tecnologia, Via Morego 30, 16163, Genova, Italy
| | - Xavier Roy
- Department of Chemistry, Columbia University, New York, NY, 10027, USA
| | - Xiaoyang Zhu
- Department of Chemistry, Columbia University, New York, NY, 10027, USA
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Pan X, Zhang F, Choi B, Luo Y, Guo X, Feng A, Thang SH. Effect of solvents on the RAFT polymerization of N-(2-hydroxypropyl) methacrylamide. Eur Polym J 2019. [DOI: 10.1016/j.eurpolymj.2019.03.016] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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32
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Roggenkamp C, Choi B, Chung J, Parhizkar R, Pham A, Robles R. Amalgam Strength Resistance to Various Contaminants. Oper Dent 2019; 44:E83-E96. [DOI: 10.2341/18-091-l] [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: 11/23/2022]
Abstract
SUMMARY
Purpose:
The purpose of this study was to quantify the relative strength tolerance of 1-day and 30-day amalgam following saturation contamination with water, saliva, blood, and handpiece lubricant oil during condensation.
Methods and Materials:
Valiant PhD XT amalgam was tested with 300 shear-strength (N=15) and 120 compressive-strength (N=6) specimens, divided into 1-day and 30-day groups, each with control, water, saliva, blood, and lubricant oil contamination samples. Shear specimens were condensed in 4 × 4-mm anchor wells inundated with contaminant fluids before adding a ring mold with 3.5-mm-diameter central hole adapted immediately to the top for continued condensation under contaminant-submerged conditions. Compressive specimen samples were condensed while completely inundated by each contaminant using the American Dental Association Specification No. 1 amalgam mold apparatus. All specimens were tested with the Instron E3000 and E10000 at 0.5 mm/min, with data statistically evaluated using the Kruskal-Wallis procedure with IBM SPSS v25 and Wilcoxon signed ranks test.
Results:
Shear test values (mean±SD) following intracapsular and extracapsular contamination after 30 days under 100% humidity at 37°C were as follows: control, 30.97±5.41 MPa; water, 30.63 ±4.41 MPa; saliva, 27.54 ±4.56 MPa; blood, 24.92 ±3.48 MPa; lubricant oil, 26.06 ±4.06 MPa. Compressive strengths (±SD) of similarly contaminated samples were as follows: control, 447.7 ±76.3 MPa; water, 343.6 ±70.1 MPa; saliva, 307.7 ±24.0 MPa; blood, 281.6 ±35.2 MPa; lubricant oil, 227.8 ±16.9 MPa.
Conclusions:
Saliva, blood, and handpiece oil diminish compressive strength significantly, but water shows no statistically significant effect (p>0.05). Amalgam 30-day shear strength is significantly altered by contamination with water, blood, or handpiece lubricant oil (p<0.05). Remaining amalgam strength after extensive contamination may still be clinically functional relative to a previous ADA recommendation and when compared with resin-based direct restorative materials.
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Affiliation(s)
- C Roggenkamp
- Clyde L. Roggenkamp, DDS, MSD, MPH, Restorative Dentistry, Loma Linda University, Loma Linda, CA, USA
| | - B Choi
- Brian J Choi, DDS student, Loma Linda University School of Dentistry, Anchorage, AK, USA
| | - J Chung
- Jae K Chung, DDS student, Loma Linda University School of Dentistry, Loma Linda, CA, USA
| | - R Parhizkar
- Reza Parhizkar, DDS student, Loma Linda University School of Dentistry, Redlands, CA, USA
| | - A Pham
- Anthony Pham, DDS student, Loma Linda University School of Dentistry, Corona, CA, USA
| | - R Robles
- Rodrigo Robles, DDS student, Loma Linda University School of Dentistry, Redlands, CA, USA
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Chen C, Guo X, Du J, Choi B, Tang H, Feng A, Thang SH. Synthesis of multifunctional miktoarm star polymers via an RGD peptide-based RAFT agent. Polym Chem 2019. [DOI: 10.1039/c8py01355a] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
A “grafting from” approach for facile access of multifunctional miktoarm star polymers containing peptide arms.
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Affiliation(s)
- Chao Chen
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering
- College of Materials Science and Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- China
| | - Xiaofeng Guo
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering
- College of Materials Science and Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- China
| | - Jinhong Du
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering
- College of Materials Science and Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- China
| | - Bonnie Choi
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering
- College of Materials Science and Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- China
| | - Houliang Tang
- Department of Chemistry
- Southern Methodist University
- Dallas
- USA
| | - Anchao Feng
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering
- College of Materials Science and Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- China
| | - San H. Thang
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering
- College of Materials Science and Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- China
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34
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Wang M, Choi B, Sun Z, Wei X, Feng A, Thang SH. Spindle-like and telophase-like self-assemblies mediated by complementary nucleobase molecular recognition. Chem Commun (Camb) 2019; 55:1462-1465. [DOI: 10.1039/c8cc09923e] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Supramolecular nanoparticles based on complementary nucleobase interactions have aroused wide interest.
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Affiliation(s)
- Mu Wang
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering
- College of Materials Science and Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- China
| | - Bonnie Choi
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering
- College of Materials Science and Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- China
| | - Zhonghe Sun
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering
- College of Materials Science and Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- China
| | - Xiaohu Wei
- State Key Laboratory of Special Functional Waterproof Materials
- Beijing Oriental Yuhong Waterproof Technology Co
- Ltd
- Beijing 100123
- China
| | - Anchao Feng
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering
- College of Materials Science and Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- China
| | - San H. Thang
- School of Chemistry
- Monash University
- Clayton Campus
- VIC 3800
- Australia
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35
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Abstract
Hydrophobic drug paclitaxel was modified into a polymerizable monomer and subsequently copolymerized with pH-sensitive monomers and redox-sensitive disulfide-based cyclic monomers.
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Affiliation(s)
- Jinhong Du
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering
- College of Materials Science and Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- China
| | - Bonnie Choi
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering
- College of Materials Science and Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- China
| | - Yuxuan Liu
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering
- College of Materials Science and Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- China
| | - Anchao Feng
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering
- College of Materials Science and Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- China
| | - San H. Thang
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering
- College of Materials Science and Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- China
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36
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Pan X, Guo X, Choi B, Feng A, Wei X, Thang SH. A facile synthesis of pH stimuli biocompatible block copolymer poly(methacrylic acid)-block-poly(N-vinylpyrrolidone) utilizing switchable RAFT agents. Polym Chem 2019. [DOI: 10.1039/c9py00110g] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Synthesis of block copolymer PMAA-b-PNVP utilizing switchable RAFT agents and its self-assembly.
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Affiliation(s)
- Xiangyu Pan
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering
- College of Materials Science and Engineering
- Beijing University of Chemical Technology
- Beijing
- China
| | - Xiaofeng Guo
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering
- College of Materials Science and Engineering
- Beijing University of Chemical Technology
- Beijing
- China
| | - Bonnie Choi
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering
- College of Materials Science and Engineering
- Beijing University of Chemical Technology
- Beijing
- China
| | - Anchao Feng
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering
- College of Materials Science and Engineering
- Beijing University of Chemical Technology
- Beijing
- China
| | - Xiaohu Wei
- State Key Laboratory of Special Functional Waterproof Materials
- Beijing Oriental Yuhong Waterproof Technology Co
- Ltd
- Beijing 100123
- China
| | - San H. Thang
- School of Chemistry
- Monash University Clayton Campus
- Australia
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37
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Choi B, Jun H. THE ASSOCIATIONS OF LEISURE ACTIVITY AND HEALTH AMONG KOREAN BABY BOOMERS. Innov Aging 2018. [DOI: 10.1093/geroni/igy023.1409] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- B Choi
- Yonsei University, Seoul, Seoul-t’ukpyolsi, Republic of Korea
| | - H Jun
- Child and Family Studies, Yonsei University, Seoul, Republic of Korea
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38
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Hernández Sánchez R, Champsaur AM, Choi B, Wang SG, Bu W, Roy X, Chen Y, Steigerwald ML, Nuckolls C, Paley DW. Electron Cartography in Clusters. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201806426] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | | | - Bonnie Choi
- Department of Chemistry Columbia University New York NY 10027 USA
| | | | - Wei Bu
- ChemMatCARS The University of Chicago Argonne IL 60439 USA
| | - Xavier Roy
- Department of Chemistry Columbia University New York NY 10027 USA
| | - Yu‐Sheng Chen
- ChemMatCARS The University of Chicago Argonne IL 60439 USA
| | | | - Colin Nuckolls
- Department of Chemistry Columbia University New York NY 10027 USA
| | - Daniel W. Paley
- Department of Chemistry Columbia University New York NY 10027 USA
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39
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Guo X, Choi B, Feng A, Thang SH. Polymer Synthesis with More Than One Form of Living Polymerization Method. Macromol Rapid Commun 2018; 39:e1800479. [DOI: 10.1002/marc.201800479] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2018] [Revised: 08/23/2018] [Indexed: 12/31/2022]
Affiliation(s)
- Xiaofeng Guo
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, College of Material Science and Engineering; Beijing University of Chemical Technology; Beijing 100029 China
| | - Bonnie Choi
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, College of Material Science and Engineering; Beijing University of Chemical Technology; Beijing 100029 China
| | - Anchao Feng
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, College of Material Science and Engineering; Beijing University of Chemical Technology; Beijing 100029 China
| | - San H. Thang
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, College of Material Science and Engineering; Beijing University of Chemical Technology; Beijing 100029 China
- School of Chemistry; Monash University; Clayton Campus VIC 3800 Australia
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40
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Choi B, Lee K, Voevodin A, Wang J, Steigerwald ML, Batail P, Zhu X, Roy X. Two-Dimensional Hierarchical Semiconductor with Addressable Surfaces. J Am Chem Soc 2018; 140:9369-9373. [PMID: 30024755 DOI: 10.1021/jacs.8b05010] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Surfaces play a key role in determining material properties, and their importance is further magnified in the two-dimensional (2D) limit. Though monolayers are entirely composed of surfaces, there is no chemical approach to covalently address them without breaking intralayer bond. Here, we describe a 2D semiconductor that offers two unique features among 2D materials: structural hierarchy within the monolayer and surface reactive sites that enable functionalization. The 2D semiconductor is composed of a single layer of strongly interconnected Re6Se8 clusters arranged in an oblique lattice capped by substitutionally labile Cl atoms. We show that a simple ligand substitution strategy borrowed from traditional coordination chemistry can be used to modify the surface of the 2D material while preserving its internal structure. The potential generality of this approach establishes a promising route toward multifunctional 2D materials with tunable physical and chemical properties and may also facilitate better electrical top contact to 2D semiconductors.
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Affiliation(s)
- Bonnie Choi
- Department of Chemistry , Columbia University , New York , New York 10027 , United States
| | - Kihong Lee
- Department of Chemistry , Columbia University , New York , New York 10027 , United States
| | - Anastasia Voevodin
- Department of Chemistry , Columbia University , New York , New York 10027 , United States
| | - Jue Wang
- Department of Chemistry , Columbia University , New York , New York 10027 , United States
| | - Michael L Steigerwald
- Department of Chemistry , Columbia University , New York , New York 10027 , United States
| | - Patrick Batail
- Department of Chemistry , Columbia University , New York , New York 10027 , United States.,Laboratoire MOLTECH, CNRS UMR 6200 , Université d'Angers , 49045 Angers , France
| | - Xiaoyang Zhu
- Department of Chemistry , Columbia University , New York , New York 10027 , United States
| | - Xavier Roy
- Department of Chemistry , Columbia University , New York , New York 10027 , United States
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41
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Lee K, Choi B, Plante IJL, Paley MV, Zhong X, Crowther AC, Owen JS, Zhu X, Roy X. Two-Dimensional Fullerene Assembly from an Exfoliated van der Waals Template. Angew Chem Int Ed Engl 2018; 57:6125-6129. [PMID: 29603561 DOI: 10.1002/anie.201800953] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [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: 01/23/2018] [Indexed: 11/09/2022]
Abstract
Two-dimensional (2D) materials are commonly prepared by exfoliating bulk layered van der Waals crystals. The creation of synthetic 2D materials from bottom-up methods is an important challenge as their structural flexibility will enable chemists to tune the materials properties. A 2D material was assembled using C60 as a polymerizable monomer. The C60 building blocks are first assembled into a layered solid using a molecular cluster as structure director. The resulting hierarchical crystal is used as a template to polymerize its C60 monolayers, which can be exfoliated down to 2D crystalline nanosheets. Derived from the parent template, the 2D structure is composed of a layer of inorganic cluster, sandwiched between two monolayers of polymerized C60 . The nanosheets can be transferred onto solid substrates and depolymerized by heating. Electronic absorption spectroscopy reveals an optical gap of 0.25 eV, narrower than that of the bulk parent crystalline solid.
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Affiliation(s)
- Kihong Lee
- Department of Chemistry, Columbia University, New York, NY, 10027, USA
| | - Bonnie Choi
- Department of Chemistry, Columbia University, New York, NY, 10027, USA
| | | | - Maria V Paley
- Department of Chemistry, Columbia University, New York, NY, 10027, USA.,Department of Chemistry, Barnard College, New York, NY, 10027, USA
| | - Xinjue Zhong
- Department of Chemistry, Columbia University, New York, NY, 10027, USA
| | | | - Jonathan S Owen
- Department of Chemistry, Columbia University, New York, NY, 10027, USA
| | - Xiaoyang Zhu
- Department of Chemistry, Columbia University, New York, NY, 10027, USA
| | - Xavier Roy
- Department of Chemistry, Columbia University, New York, NY, 10027, USA
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42
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Lee K, Choi B, Plante IJ, Paley MV, Zhong X, Crowther AC, Owen JS, Zhu X, Roy X. Two‐Dimensional Fullerene Assembly from an Exfoliated van der Waals Template. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201800953] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Kihong Lee
- Department of Chemistry Columbia University New York NY 10027 USA
| | - Bonnie Choi
- Department of Chemistry Columbia University New York NY 10027 USA
| | | | - Maria V. Paley
- Department of Chemistry Columbia University New York NY 10027 USA
- Department of Chemistry Barnard College New York NY 10027 USA
| | - Xinjue Zhong
- Department of Chemistry Columbia University New York NY 10027 USA
| | | | - Jonathan S. Owen
- Department of Chemistry Columbia University New York NY 10027 USA
| | - Xiaoyang Zhu
- Department of Chemistry Columbia University New York NY 10027 USA
| | - Xavier Roy
- Department of Chemistry Columbia University New York NY 10027 USA
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43
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Kim S, Choi B, Kim E, Oh J, Chun H, Lee H. Abstract No. 715 The parallel central venous stent placement method is an easy way in the patients with central venous obstruction. J Vasc Interv Radiol 2018. [DOI: 10.1016/j.jvir.2018.01.760] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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44
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Zhong X, Lee K, Choi B, Meggiolaro D, Liu F, Nuckolls C, Pasupathy A, De Angelis F, Batail P, Roy X, Zhu X. Superatomic Two-Dimensional Semiconductor. Nano Lett 2018; 18:1483-1488. [PMID: 29368934 DOI: 10.1021/acs.nanolett.7b05278] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Structural complexity is of fundamental interest in materials science because it often results in unique physical properties and functions. Founded on this idea, the field of solid state chemistry has a long history and continues to be highly active, with new compounds discovered daily. By contrast, the area of two-dimensional (2D) materials is young, but its expansion, although rapid, is limited by a severe lack of structural diversity and complexity. Here, we report a novel 2D semiconductor with a hierarchical structure composed of covalently linked Re6Se8 clusters. The material, a 2D structural analogue of the Chevrel phase, is prepared via mechanical exfoliation of the van der Waals solid Re6Se8Cl2. Using scanning tunneling spectroscopy, photoluminescence and ultraviolet photoelectron spectroscopy, and first-principles calculations, we determine the electronic bandgap (1.58 eV), optical bandgap (indirect, 1.48 eV), and exciton binding energy (100 meV) of the material. The latter is consistent with the partially 2D nature of the exciton. Re6Se8Cl2 is the first member of a new family of 2D semiconductors whose structure is built from superatomic building blocks instead of simply atoms; such structures will expand the conceptual design space for 2D materials research.
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Affiliation(s)
| | | | | | - Daniele Meggiolaro
- Computational Laboratory for Hybrid/Organic Photovoltaics (CLHYO), CNR-ISTM , Via Elce di Sotto 8, I-06123 Perugia, Italy
- D3-CompuNet, Istituto Italiano di Tecnologia , Via Morego 30, 16163 Genova, Italy
| | | | | | | | - Filippo De Angelis
- Computational Laboratory for Hybrid/Organic Photovoltaics (CLHYO), CNR-ISTM , Via Elce di Sotto 8, I-06123 Perugia, Italy
- D3-CompuNet, Istituto Italiano di Tecnologia , Via Morego 30, 16163 Genova, Italy
| | - Patrick Batail
- Laboratoire MOLTECH, CNRS UMR 6200, Université d'Angers , 49045 Angers, France
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45
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Wang M, Choi B, Wei X, Feng A, Thang SH. Synthesis, self-assembly, and base-pairing of nucleobase end-functionalized block copolymers in aqueous solution. Polym Chem 2018. [DOI: 10.1039/c8py01201f] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
As a novel strategy, nucleobase-containing copolymers are created for molecular recognition and nucleobase releasing.
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Affiliation(s)
- Mu Wang
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering
- College of Materials Science and Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- China
| | - Bonnie Choi
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering
- College of Materials Science and Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- China
| | - Xiaohu Wei
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering
- College of Materials Science and Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- China
| | - Anchao Feng
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering
- College of Materials Science and Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- China
| | - San H. Thang
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering
- College of Materials Science and Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- China
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46
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Choi B, Youn S, Lee S, Kim C, Chung S. Sleeping pills administration time and subjective satisfaction among cancer patients. Sleep Med 2017. [DOI: 10.1016/j.sleep.2017.11.176] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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47
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Lovat G, Choi B, Paley DW, Steigerwald ML, Venkataraman L, Roy X. Room-temperature current blockade in atomically defined single-cluster junctions. Nat Nanotechnol 2017; 12:1050-1054. [PMID: 28805817 DOI: 10.1038/nnano.2017.156] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2016] [Accepted: 07/04/2017] [Indexed: 06/07/2023]
Abstract
Fabricating nanoscopic devices capable of manipulating and processing single units of charge is an essential step towards creating functional devices where quantum effects dominate transport characteristics. The archetypal single-electron transistor comprises a small conducting or semiconducting island separated from two metallic reservoirs by insulating barriers. By enabling the transfer of a well-defined number of charge carriers between the island and the reservoirs, such a device may enable discrete single-electron operations. Here, we describe a single-molecule junction comprising a redox-active, atomically precise cobalt chalcogenide cluster wired between two nanoscopic electrodes. We observe current blockade at room temperature in thousands of single-cluster junctions. Below a threshold voltage, charge transfer across the junction is suppressed. The device is turned on when the temporary occupation of the core states by a transiting carrier is energetically enabled, resulting in a sequential tunnelling process and an increase in current by a factor of ∼600. We perform in situ and ex situ cyclic voltammetry as well as density functional theory calculations to unveil a two-step process mediated by an orbital localized on the core of the cluster in which charge carriers reside before tunnelling to the collector reservoir. As the bias window of the junction is opened wide enough to include one of the cluster frontier orbitals, the current blockade is lifted and charge carriers can tunnel sequentially across the junction.
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Affiliation(s)
- Giacomo Lovat
- Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, USA
| | - Bonnie Choi
- Department of Chemistry, Columbia University, New York, New York 10027, USA
| | - Daniel W Paley
- Department of Chemistry, Columbia University, New York, New York 10027, USA
- Columbia Nano Initiative, Columbia University, New York, New York 10027, USA
| | | | - Latha Venkataraman
- Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, USA
- Department of Chemistry, Columbia University, New York, New York 10027, USA
| | - Xavier Roy
- Department of Chemistry, Columbia University, New York, New York 10027, USA
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48
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Choi B, Ryu D, Kim CI, Lee JY, Choi A, Koh E. Probabilistic dietary exposure to ethyl carbamate from fermented foods and alcoholic beverages in the Korean population. Food Addit Contam Part A Chem Anal Control Expo Risk Assess 2017; 34:1885-1892. [PMID: 28783003 DOI: 10.1080/19440049.2017.1364433] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [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: 10/19/2022]
Abstract
The occurrence of ethyl carbamate was investigated in fermented foods and alcoholic beverages of the Korean total diet study. The concentrations of ethyl carbamate ranged from not detected to 166.5 μg kg-1. Dietary exposure to ethyl carbamate was estimated by the probabilistic method. Estimated intakes of ethyl carbamate from foods and alcoholic beverages were 4.12 ng kg-1 body weight (bw) per day for average consumers and 12.37 ng kg-1 bw/day for 95th percentile high consumers. The major foods contributing to ethyl carbamate exposure were soy sauce (63%), followed by maesilju (plum liqueur, 30%), whisky (5%), and bokbunjaju (black raspberry wine, 2%). On the basis of the benchmark dose lower confidence limit 10% (BMDL10) of 0.3 mg kg-1 bw/day, margins of exposure were 128,000 for mean exposure and 40,000 for 95th percentile exposure. This indicates that the exposure of the Korean general population for ethyl carbamate is of low concern. However, careful vigilance should be continued for high consumers of fermented foods and alcoholic beverages.
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Affiliation(s)
- B Choi
- a Major of Food & Nutrition, Division of Applied Food System , Seoul Women's University , Seoul , Korea
| | - D Ryu
- a Major of Food & Nutrition, Division of Applied Food System , Seoul Women's University , Seoul , Korea
| | - C-I Kim
- b Bureau of Health Industry Promotion , Korea Health Industry Development Institute , Osong , Chungcheongbuk-do , Korea
| | - J-Y Lee
- b Bureau of Health Industry Promotion , Korea Health Industry Development Institute , Osong , Chungcheongbuk-do , Korea
| | - A Choi
- b Bureau of Health Industry Promotion , Korea Health Industry Development Institute , Osong , Chungcheongbuk-do , Korea
| | - E Koh
- a Major of Food & Nutrition, Division of Applied Food System , Seoul Women's University , Seoul , Korea
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Kumarasamy E, Sanders SN, Tayebjee MJY, Asadpoordarvish A, Hele TJH, Fuemmeler EG, Pun AB, Yablon LM, Low JZ, Paley DW, Dean JC, Choi B, Scholes GD, Steigerwald ML, Ananth N, McCamey DR, Sfeir MY, Campos LM. Tuning Singlet Fission in π-Bridge-π Chromophores. J Am Chem Soc 2017; 139:12488-12494. [PMID: 28799752 DOI: 10.1021/jacs.7b05204] [Citation(s) in RCA: 119] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
We have designed a series of pentacene dimers separated by homoconjugated or nonconjugated bridges that exhibit fast and efficient intramolecular singlet exciton fission (iSF). These materials are distinctive among reported iSF compounds because they exist in the unexplored regime of close spatial proximity but weak electronic coupling between the singlet exciton and triplet pair states. Using transient absorption spectroscopy to investigate photophysics in these molecules, we find that homoconjugated dimers display desirable excited-state dynamics, with significantly reduced recombination rates as compared to conjugated dimers with similar singlet fission rates. In addition, unlike conjugated dimers, the time constants for singlet fission are relatively insensitive to the interplanar angle between chromophores, since rotation about σ bonds negligibly affects the orbital overlap within the π-bonding network. In the nonconjugated dimer, where the iSF occurs with a time constant >10 ns, comparable to the fluorescence lifetime, we used electron spin resonance spectroscopy to unequivocally establish the formation of triplet-triplet multiexcitons and uncoupled triplet excitons through singlet fission. Together, these studies enable us to articulate the role of the conjugation motif in iSF.
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Affiliation(s)
| | | | - Murad J Y Tayebjee
- Cavendish Laboratory, University of Cambridge , J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom
| | | | - Timothy J H Hele
- Department of Chemistry and Chemical Biology, Cornell University , Ithaca, New York 14850, United States.,Jesus College, Cambridge University , Cambridge CB5 8BL, United Kingdom
| | - Eric G Fuemmeler
- Department of Chemistry and Chemical Biology, Cornell University , Ithaca, New York 14850, United States
| | | | | | | | | | - Jacob C Dean
- Department of Chemistry, Princeton University , Princeton, New Jersey 08544, United States
| | | | - Gregory D Scholes
- Department of Chemistry, Princeton University , Princeton, New Jersey 08544, United States
| | | | - Nandini Ananth
- Department of Chemistry and Chemical Biology, Cornell University , Ithaca, New York 14850, United States
| | | | - Matthew Y Sfeir
- Center for Functional Nanomaterials, Brookhaven National Laboratory , Upton, New York 11973, United States
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Lee KW, Choi B, Kim YM, Cho CW, Park H, Moon JI, Choi GS, Park JB, Kim SJ. Major Histocompatibilty Complex-Restricted Adaptive Immune Responses to CT26 Colon Cancer Cell Line in Mixed Allogeneic Chimera. Transplant Proc 2017; 49:1153-1159. [PMID: 28583547 DOI: 10.1016/j.transproceed.2017.03.011] [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: 10/19/2022]
Abstract
BACKGROUND Although the induction of mixed allogeneic chimera shows promising clinical tolerance results in organ transplantation, its clinical relevance as an anti-cancer therapy is yet unknown. We introduced a mixed allogenic chimera setting with the use of a murine colon cancer cell line, CT26, by performing double bone marrow transplantation. METHODS We analyzed donor- and recipient-restricted anti-cancer T-cell responses, and phenotypes of subpopulations of T cells. The protocol involves challenging 1 × 105 cells of CT26 cells intra-hepatically on day 50 after bone marrow transplantation, and, by use of CT26 lysates and an H-2Ld-restricted AH1 pentamer, flow cytometric analysis was performed to detect the generation of cancer-specific CD4+ and CD8+ T cells at various time points. RESULTS We found that immunocompetence against tumors depends heavily on cancer-specific CD8+ T-cell responses in a major histocompatibility complex-restricted manner; the evidence was further supported by the increase of interferon-γ-secreting CD4+ T cells. Moreover, we demonstrated that during the effector immune response to CT26 cancer challenge, there was a presence of central memory cells (CD62LhiCCR7+) as well as effector memory cells (CD62LloCCR7-). Moreover, mixed allogeneic chimeras (BALB/c to C56BL/6 or vice versa) showed similar or heightened immune responses to CT26 cells compared with that of wild-type mice. CONCLUSIONS Our results suggest that the responses of primary immunocompetency and of pre-existing memory T cells against allogeneic cancer are sustained and preserved long-term in a mixed allogeneic chimeric environment.
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Affiliation(s)
- K W Lee
- Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea; Transplantation Research Center, Samsung Biomedical Research Institute, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - B Choi
- Transplantation Research Center, Samsung Biomedical Research Institute, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Y M Kim
- Laboratory of Immunology and Infectious Disease, Graduate School of Medical Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon, Korea
| | - C W Cho
- Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea; Transplantation Research Center, Samsung Biomedical Research Institute, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - H Park
- Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea; Transplantation Research Center, Samsung Biomedical Research Institute, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - J I Moon
- Department of Surgery, Konyang University Hospital, Daejeon, Korea
| | - G-S Choi
- Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
| | - J B Park
- Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea; Transplantation Research Center, Samsung Biomedical Research Institute, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - S J Kim
- Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea; Transplantation Research Center, Samsung Biomedical Research Institute, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
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