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Reiner J, Chung Y, Misha SH, Lehner C, Moehle C, Poulos D, Monir S, Charde KJ, Macha P, Kranz L, Thorvaldson I, Thorgrimsson B, Keith D, Hsueh YL, Rahman R, Gorman SK, Keizer JG, Simmons MY. High-fidelity initialization and control of electron and nuclear spins in a four-qubit register. Nat Nanotechnol 2024; 19:605-611. [PMID: 38326467 DOI: 10.1038/s41565-023-01596-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2023] [Accepted: 12/20/2023] [Indexed: 02/09/2024]
Abstract
Single electron spins bound to multi-phosphorus nuclear spin registers in silicon have demonstrated fast (0.8 ns) two-qubitSWAP gates and long spin relaxation times (~30 s). In these spin registers, when the donors are ionized, the nuclear spins remain weakly coupled to their environment, allowing exceptionally long coherence times. When the electron is present, the hyperfine interaction allows coupling of the spin and charge degrees of freedom for fast qubit operation and control. Here we demonstrate the use of the hyperfine interaction to enact electric dipole spin resonance to realize high-fidelity ( F = 10 0 - 6 + 0 %) initialization of all the nuclear spins within a four-qubit nuclear spin register. By controllably initializing the nuclear spins to⇓ ⇓ ⇓ , we achieve single-electron qubit gate fidelities of F = 99.78 ± 0.07% (Clifford gate fidelities of 99.58 ± 0.14%), above the fault-tolerant threshold for the surface code with a coherence time ofT 2 * = 12 μ s .
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Affiliation(s)
- J Reiner
- Centre of Excellence for Quantum Computation and Communication Technology, School of Physics, University of New South Wales, Sydney, New South Wales, Australia
- Silicon Quantum Computing Pty Ltd., University of New South Wales, Sydney, New South Wales, Australia
| | - Y Chung
- Centre of Excellence for Quantum Computation and Communication Technology, School of Physics, University of New South Wales, Sydney, New South Wales, Australia
- Silicon Quantum Computing Pty Ltd., University of New South Wales, Sydney, New South Wales, Australia
| | - S H Misha
- Centre of Excellence for Quantum Computation and Communication Technology, School of Physics, University of New South Wales, Sydney, New South Wales, Australia
- Silicon Quantum Computing Pty Ltd., University of New South Wales, Sydney, New South Wales, Australia
| | - C Lehner
- Centre of Excellence for Quantum Computation and Communication Technology, School of Physics, University of New South Wales, Sydney, New South Wales, Australia
- Silicon Quantum Computing Pty Ltd., University of New South Wales, Sydney, New South Wales, Australia
| | - C Moehle
- Centre of Excellence for Quantum Computation and Communication Technology, School of Physics, University of New South Wales, Sydney, New South Wales, Australia
- Silicon Quantum Computing Pty Ltd., University of New South Wales, Sydney, New South Wales, Australia
| | - D Poulos
- Centre of Excellence for Quantum Computation and Communication Technology, School of Physics, University of New South Wales, Sydney, New South Wales, Australia
- Silicon Quantum Computing Pty Ltd., University of New South Wales, Sydney, New South Wales, Australia
| | - S Monir
- Silicon Quantum Computing Pty Ltd., University of New South Wales, Sydney, New South Wales, Australia
- School of Physics, University of New South Wales, Sydney, New South Wales, Australia
| | - K J Charde
- Centre of Excellence for Quantum Computation and Communication Technology, School of Physics, University of New South Wales, Sydney, New South Wales, Australia
- Silicon Quantum Computing Pty Ltd., University of New South Wales, Sydney, New South Wales, Australia
| | - P Macha
- Centre of Excellence for Quantum Computation and Communication Technology, School of Physics, University of New South Wales, Sydney, New South Wales, Australia
- Silicon Quantum Computing Pty Ltd., University of New South Wales, Sydney, New South Wales, Australia
| | - L Kranz
- Centre of Excellence for Quantum Computation and Communication Technology, School of Physics, University of New South Wales, Sydney, New South Wales, Australia
- Silicon Quantum Computing Pty Ltd., University of New South Wales, Sydney, New South Wales, Australia
| | - I Thorvaldson
- Centre of Excellence for Quantum Computation and Communication Technology, School of Physics, University of New South Wales, Sydney, New South Wales, Australia
- Silicon Quantum Computing Pty Ltd., University of New South Wales, Sydney, New South Wales, Australia
| | - B Thorgrimsson
- Centre of Excellence for Quantum Computation and Communication Technology, School of Physics, University of New South Wales, Sydney, New South Wales, Australia
- Silicon Quantum Computing Pty Ltd., University of New South Wales, Sydney, New South Wales, Australia
| | - D Keith
- Centre of Excellence for Quantum Computation and Communication Technology, School of Physics, University of New South Wales, Sydney, New South Wales, Australia
- Silicon Quantum Computing Pty Ltd., University of New South Wales, Sydney, New South Wales, Australia
| | - Y L Hsueh
- Silicon Quantum Computing Pty Ltd., University of New South Wales, Sydney, New South Wales, Australia
- School of Physics, University of New South Wales, Sydney, New South Wales, Australia
| | - R Rahman
- Silicon Quantum Computing Pty Ltd., University of New South Wales, Sydney, New South Wales, Australia
- School of Physics, University of New South Wales, Sydney, New South Wales, Australia
| | - S K Gorman
- Centre of Excellence for Quantum Computation and Communication Technology, School of Physics, University of New South Wales, Sydney, New South Wales, Australia
- Silicon Quantum Computing Pty Ltd., University of New South Wales, Sydney, New South Wales, Australia
| | - J G Keizer
- Centre of Excellence for Quantum Computation and Communication Technology, School of Physics, University of New South Wales, Sydney, New South Wales, Australia
- Silicon Quantum Computing Pty Ltd., University of New South Wales, Sydney, New South Wales, Australia
| | - M Y Simmons
- Centre of Excellence for Quantum Computation and Communication Technology, School of Physics, University of New South Wales, Sydney, New South Wales, Australia.
- Silicon Quantum Computing Pty Ltd., University of New South Wales, Sydney, New South Wales, Australia.
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Bhuiyan MSA, Kim YK, Lee DH, Chung Y, Lee DJ, Kang JM, Lee SH. Evaluation of non-additive genetic effects on carcass and meat quality traits in Korean Hanwoo cattle using genomic models. Animal 2024; 18:101152. [PMID: 38701710 DOI: 10.1016/j.animal.2024.101152] [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] [Received: 10/03/2023] [Revised: 03/26/2024] [Accepted: 03/29/2024] [Indexed: 05/05/2024] Open
Abstract
The traditional genetic evaluation methods generally consider additive genetic effects only and often ignore non-additive (dominance and epistasis) effects that may have contributed to genetic variation of complex traits of livestock species. The available dense single nucleotide polymorphisms (SNPs) panels offer to investigate the potential benefits of including non-additive genetic effects in the genomic evaluation models. Data from 16 971 genotyped (Illumina Bovine 50 K SNP chip) Korean Hanwoo cattle were used to estimate genetic variance components and prediction accuracy of genomic breeding values (GEBVs) for four carcass and meat quality traits: carcass weight (CWT), eye muscle area (EMA), back fat thickness (BFT) and marbling score (MS). Five different genetic models were evaluated through including additive, dominance and epistatic interactions (additive by additive, A × A; additive by dominance, A × D and dominance by dominance, D × D) successively in the models. The estimates of additive genetic variances and narrow sense heritabilities (ha2) were found similar across the evaluated models and traits except when additive interaction (A × A) was included. The dominance variance estimates relative to phenotypic variance ranged from 1.7-3.4% for CWT and MS traits, whereas, they were close to zero for EMA and BFT traits. The magnitude of A × A epistatic heritability (haa2) ranged between 14.8 and 27.7% in all traits. However, heritability estimates for A × D and D × D epistatic interactions (had2 and hdd2) were quite low compared to haa2 and were contributed only 0.0-9.7% of the total phenotypic variation. In general, broad sense heritability (hG2) estimates were almost twice (ranging between 0.54 and 0.68) the ha2 for all of the investigated traits. The inclusion of dominance effects did not improve the prediction accuracy of GEBV but improved 2.0-3.0% when epistatic effects were included in the model. More importantly, rank correlation revealed that partitioning of variance components considering dominance and epistatic effects in the model would enable to re-rank of top animals with better prediction of GEBV. The present result suggests that dominance and epistatic effects could be included in the genomic evaluation model for better estimates of variance components and more accurate prediction of GEBV for carcass and meat quality traits in Korean Hanwoo cattle.
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Affiliation(s)
- M S A Bhuiyan
- Division of Animal and Dairy Science, Chungnam National University, Daejeon 34134, Republic of Korea
| | - Y K Kim
- Division of Animal and Dairy Science, Chungnam National University, Daejeon 34134, Republic of Korea; Quantomic Research & Solution, Yuseong-gu, Daejeon 34134, Republic of Korea
| | - D H Lee
- Division of Animal and Dairy Science, Chungnam National University, Daejeon 34134, Republic of Korea; Quantomic Research & Solution, Yuseong-gu, Daejeon 34134, Republic of Korea
| | - Y Chung
- Division of Animal and Dairy Science, Chungnam National University, Daejeon 34134, Republic of Korea
| | - D J Lee
- Division of Animal and Dairy Science, Chungnam National University, Daejeon 34134, Republic of Korea
| | - J M Kang
- Division of Animal and Dairy Science, Chungnam National University, Daejeon 34134, Republic of Korea
| | - S H Lee
- Division of Animal and Dairy Science, Chungnam National University, Daejeon 34134, Republic of Korea.
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Chrysostomou V, Bell KC, Ng SW, Suresh S, Karthik G, Millet M, Chung Y, Crowston JG. A new model of axon degeneration in the mouse optic nerve using repeat intraocular pressure challenge. Exp Eye Res 2024; 238:109722. [PMID: 37952724 DOI: 10.1016/j.exer.2023.109722] [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] [Received: 08/16/2023] [Revised: 10/29/2023] [Accepted: 11/07/2023] [Indexed: 11/14/2023]
Abstract
We characterize a new experimental model for inducing retinal ganglion cell (RGC) dysfunction and degeneration in mice. C57BL/6J mice were subjected to two acute periods of intraocular pressure (IOP) elevation (50 mmHg for 30 min) by cannulation of the anterior chamber. We used full-field electroretinography and visual evoked potentials (VEPs) to measure subsequent changes in retina and optic nerve function, and histochemical techniques to assess RGC survival and optic nerve structure. In 12 month old mice, a single IOP challenge caused loss and subsequent recovery of RGC function over the following 28 days with minimal cell death and no observed axonal damage. A second identical IOP challenge resulted in persistent RGC dysfunction and significant (36%) loss of RGC somas. This was accompanied by a 16.7% delay in the latency and a 27.6% decrease in the amplitude of the VEP. Severe axonal damage was seen histologically with enlargement of axons, myelin disruption, reduced axon density, and the presence of glial scarring. In contrast, younger 3 month old mice when exposed to a single or repeat IOP challenge showed quicker RGC functional recovery after a single challenge and full functional recovery after a repeat challenge with no detectable optic nerve dysfunction. These data demonstrate a highly reproducible and minimally invasive method for inducing RGC degeneration and axonal damage in mice. Resilience of the optic nerve to damage is highly dependent on animal age. The time-defined nature of functional versus structural loss seen in this model stands to facilitate investigation of neuroglial responses in the retina after IOP injury and the associated evaluation of neuroprotective treatment strategies. Further, the model may be used to investigate the impact of aging and the cellular switch between neurorecovery and neurodegeneration.
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Affiliation(s)
- Vicki Chrysostomou
- Centre for Vision Research, Duke-NUS Medical School, 8 College Road, 169857, Singapore; Singapore Eye Research Institute, The Academia, 20 College Road, 169856, Singapore.
| | - Katharina C Bell
- Singapore Eye Research Institute, The Academia, 20 College Road, 169856, Singapore; EYE-ACP, Duke-NUS Medical School, 8 College Road, 169857, Singapore; Save Sight Institute, Charles Perkins Centre, University of Sydney, Australia
| | - Sze Woei Ng
- Centre for Vision Research, Duke-NUS Medical School, 8 College Road, 169857, Singapore; Singapore Eye Research Institute, The Academia, 20 College Road, 169856, Singapore
| | - Samyuktha Suresh
- Centre for Vision Research, Duke-NUS Medical School, 8 College Road, 169857, Singapore
| | - Gayathri Karthik
- Centre for Vision Research, Duke-NUS Medical School, 8 College Road, 169857, Singapore
| | - Marion Millet
- Centre for Vision Research, Duke-NUS Medical School, 8 College Road, 169857, Singapore; Singapore Eye Research Institute, The Academia, 20 College Road, 169856, Singapore
| | - Yingying Chung
- Centre for Vision Research, Duke-NUS Medical School, 8 College Road, 169857, Singapore; Singapore Eye Research Institute, The Academia, 20 College Road, 169856, Singapore
| | - Jonathan G Crowston
- Centre for Vision Research, Duke-NUS Medical School, 8 College Road, 169857, Singapore; Singapore Eye Research Institute, The Academia, 20 College Road, 169856, Singapore; Save Sight Institute, Charles Perkins Centre, University of Sydney, Australia
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Ruschel VC, Stolf SC, da Luz Baratieri C, Chung Y, Boushell LW, Baratieri LN, Walter R. Five-year Clinical Evaluation of Universal Adhesives in Noncarious Cervical Lesions. Oper Dent 2023:493223. [PMID: 37226698 DOI: 10.2341/21-132-c] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/27/2022] [Indexed: 05/26/2023]
Abstract
OBJECTIVES To compare the clinical performance of mildly acidic universal adhesives Scotchbond Universal (SU, 3M Oral Care, St Paul, MN, USA) and Prime & Bond Elect (PBE, Dentsply Sirona, Charlotte, NC, USA) in the restoration of noncarious cervical lesions (NCCLs). METHODS AND MATERIALS A total of 63 patients in need of 203 NCCL restorations participated in this randomized controlled clinical trial. Notch-shaped lesions were restored with Kalore (GC Corporation, Tokyo, Japan) after application of either SU or PBE, following the etch-and-rinse (ER) or self-etch (SE) techniques. Subjects were followed up for 60 months. The focus of the statistical analyses was on the change of outcome over time as assessed by the Modified USPHS rating system (ie, Alfa vs Bravo + Charlie outcomes). Logistic regression was performed for each outcome separately with compound symmetric variance-covariance structure assumed to consider a correlation of restorations within subjects. All analyses were conducted using SAS 9.4 (SAS, Cary, NC, USA). RESULTS One-hundred twenty-nine teeth in 35 subjects were assessed at the 60-month follow-up. In addition, three restorations that failed prior to the 60-month evaluation, two of which were in subjects who did not present for the 60-month follow-up, were included in the statistical analysis. In total, two restorations in the SU_ER group and three restorations in the PBE_SE group failed the retention category. Statistically significant differences were obtained for the comparison of restorations in the PBE_SE and PBE_ER groups, where the former was 58% less likely to maintain a score of Alfa for marginal discoloration than the latter. CONCLUSIONS SU and PBE demonstrated acceptable clinical performance at 60 months with regard to restoration retention. Phosphoric-acid etching of the NCCLs prior to adhesive application significantly improved the performance of PBE in regard to marginal discoloration.
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Affiliation(s)
- V C Ruschel
- Vanessa Carla Ruschel, DDS, MS, PhD, Federal University of Santa Catarina, Florianópolis, SC, Brazil
| | - S C Stolf
- Sheila Cristina Stolf, DDS, MS, PhD, Federal University of Santa Catarina, Florianópolis, SC, Brazil
| | - C da Luz Baratieri
- Carolina da Luz Baratieri, DDS, MS, PhD, Federal University of Santa Catarina, Florianópolis, SC, Brazil
| | - Y Chung
- Yunro Chung, PhD, College of Health Solutions, Arizona State University, Phoenix, AZ, USA; Center for Personalized Diagnostics, Biodesign Institute, Arizona State University, Tempe, AZ, USA
| | - L W Boushell
- Lee Warren Boushell, DDS, MS, East Carolina State University, Greenville, NC, USA
| | - L N Baratieri
- Luiz Narciso Baratieri, DDS, MS, PhD, Federal University of Santa Catarina, Florianópolis, SC, Brazil
| | - R Walter
- *Ricardo Walter, DDS, MS, University of North Carolina at Chapel Hill School of Dentistry, Chapel Hill, NC, USA
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Carstens D, Smith J, Chung Y, Pan S, Barlows T, Nepal B, Barron J. REDUCTIONS IN EXACERBATIONS OF SEVERE ASTHMA PATIENTS TREATED WITH BENRALIZUMAB – ZEPHYR 3. Ann Allergy Asthma Immunol 2022. [DOI: 10.1016/j.anai.2022.08.615] [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: 11/11/2022]
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Chung Y, Carr T, Ambrose C, Lindsley A, Collacott H, Schulz A, Desai P, Rane P, Williams M. PATIENT AND CLINICIAN PREFERENCES WITH BIOLOGIC TREATMENTS FOR SEVERE ASTHMA: A DISCRETE CHOICE EXPERIMENT. Ann Allergy Asthma Immunol 2022. [DOI: 10.1016/j.anai.2022.08.641] [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: 11/11/2022]
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Chung Y, Tsoi L, White BEP, Zeng C, Billi A, Gudjonsson J. 482 Differences in chromatin accessibility in male vs female keratinocytes using ATAC-seq. J Invest Dermatol 2022. [DOI: 10.1016/j.jid.2022.05.491] [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: 10/17/2022]
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Melo P, Eapen A, Chung Y, Jeve Y, Price MJ, Sunkara SK, Macklon NS, Bhattacharya S, Khalaf Y, Tobias A, Broekmans F, Khairy M, Gallos I, Coomarasamy A. O-009 Controlled ovarian stimulation (COS) protocols for assisted reproduction: a Cochrane systematic review and network meta-analysis. Hum Reprod 2022. [DOI: 10.1093/humrep/deac104.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Study question
What is the relative effectiveness and safety of existing COS protocols for women undergoing assisted reproductive technology (ART) treatment?
Summary answer
There was no difference in live birth between all protocols, but short antagonist protocols may reduce ovarian hyperstimulation syndrome in women with predicted normal/high response.
What is known already
Controlled ovarian stimulation is an essential step in most ART cycles. It involves the administration of exogenous gonadotrophins to induce multifollicular growth, usually in addition to drugs that prevent untimely ovulation by suppressing the pituitary gland. Different treatment combinations may be used in COS. These vary according to the type of drugs administered for pituitary suppression (e.g., gonadotrophin-releasing hormone [GnRH] agonists, antagonists) and ovarian stimulation (e.g., urinary or recombinant gonadotrophins). Drug dosages, timing and routes of administration also vary between different regimens. However, there is no consensus on how the existing COS protocols rank according to their effectiveness and safety.
Study design, size, duration
We searched the following databases to November 2021: MEDLINE, EMBASE, CINAHL, CENTRAL and ClinicalTrials.gov. We included randomised controlled trials (RCTs) comparing at least two COS protocols using GnRH agonists or antagonists for pituitary suppression; and human menopausal gonadotrophin (hMG), urinary or recombinant follicle-stimulating hormone (u/rFSH), with or without luteinising hormone (LH) for ovarian stimulation. The primary outcomes were the rates of live birth (LBR) and ovarian hyperstimulation syndrome (OHSS) per participant after one stimulation cycle.
Participants/materials, setting, methods
Two reviewers independently selected studies and extracted data. We conducted pairwise and network meta-analyses (NMA) according to participants’ predicted response to COS (normal, high and low). Using the Cochrane-RoB-1 tool, we restricted our primary analyses to RCTs at low risk of selection and other biases. We presented effect estimates as risk ratio (RR) with 95% confidence interval (CI) and considered I2>50% as representing substantial heterogeneity. For each outcome, we generated ranking plots comparing different interventions.
Main results and the role of chance
In total, our searches identified 9464 studies. The primary analysis included 68 RCTs assessing 17861 women and 34 different COS protocols. The evidence showed that in women with predicted normal or high response, the use of short GnRH antagonist protocols may result in little to no difference in LBR (RR 0.98, 95% CI 0.85 to 1.13; 6 studies; 2063 women; I2 = 0%; low-certainty evidence) and a reduction in OHSS (RR 0.88, 95% CI 0.78 to 0.99; 7 studies; 2246 women; I2 = 0%; low-certainty evidence) compared with long GnRH agonist protocols. The rankogram comparing different COS protocols showed a probability of 98% that short GnRH antagonist regimens are the best treatment to prevent OHSS. Sensitivity analyses including all studies showed that in women with predicted normal response undergoing long GnRH agonist cycles for pituitary suppression, the use of rFSH for ovarian stimulation may result in decreased fresh-cycle LBR compared to hMG (RR 0.80, 95% CI 0.68 to 0.95; 7 studies; 1575 women; I2 = 1%; low-certainty evidence). For the remaining interventions (e.g., agonist flare or progestogens for pituitary suppression, in combination with various gonadotrophin regimens) the evidence was uncertain of an effect or insufficient for quantitative synthesis.
Limitations, reasons for caution
The high number of interventions resulted in disconnected networks, limiting our ability to perform NMA for some comparisons. The certainty of the evidence was limited by serious risk of bias. Finally, the lack of data on cumulative LBR and differences in oocyte yield made comparisons between FSH preparations potentially unbalanced.
Wider implications of the findings
Our findings suggest that the use of short GnRH antagonist protocols may result in reduced OHSS rates in women with predicted normal or high ovarian response without compromising live birth rates. There is a paucity of high-quality RCTs comparing different gonadotrophin preparations (e.g., hMG versus rFSH) for COS.
Trial registration number
N/A
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Affiliation(s)
- P Melo
- Tommy's National Centre for Miscarriage Research, University of Birmingham , Birmingham, United Kingdom
| | - A Eapen
- REI Division - Carver College of Medicine, University of Iowa Hospital and Clinics , Iowa, U.S.A
| | - Y Chung
- Tommy's National Centre for Miscarriage Research, University of Birmingham , Birmingham, United Kingdom
| | - Y Jeve
- Department of Obstetrics and Gynaecology, Birmingham Women's Hospital , Birmingham, United Kingdom
| | - M J Price
- Institute of Applied Health Research, University of Birmingham , Birmingham, United Kingdom
| | - S K Sunkara
- Division of Women's Health - Faculty of Life Sciences and Medicine, King's College London , London, United Kingdom
| | - N S Macklon
- London Women's Clinic, London Women's Clinic , London, United Kingdom
| | - S Bhattacharya
- School of Medicine- Medical Sciences and Nutrition, University of Aberdeen , Aberdeen, United Kingdom
| | - Y Khalaf
- Assisted Conception Unit and Centre for Preimplantation Genetic Diagnosis, Guy's and St Thomas' Hospital and King's College London, London , United Kingdom
| | - A Tobias
- Tommy's National Centre for Miscarriage Research, University of Birmingham , Birmingham, United Kingdom
| | - F Broekmans
- Center for Reproductive Medicine, University Medical Center Utrecht , Utrecht, The Netherlands
| | - M Khairy
- CARE Fertility Birmingham, CARE Fertility , Birmingham, United Kingdom
| | - I Gallos
- Tommy's National Centre for Miscarriage Research, University of Birmingham , Birmingham, United Kingdom
| | - A Coomarasamy
- Tommy's National Centre for Miscarriage Research, University of Birmingham , Birmingham, United Kingdom
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Kiczynski M, Gorman SK, Geng H, Donnelly MB, Chung Y, He Y, Keizer JG, Simmons MY. Engineering topological states in atom-based semiconductor quantum dots. Nature 2022; 606:694-699. [PMID: 35732762 PMCID: PMC9217742 DOI: 10.1038/s41586-022-04706-0] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Accepted: 03/01/2022] [Indexed: 11/21/2022]
Abstract
The realization of controllable fermionic quantum systems via quantum simulation is instrumental for exploring many of the most intriguing effects in condensed-matter physics1–3. Semiconductor quantum dots are particularly promising for quantum simulation as they can be engineered to achieve strong quantum correlations. However, although simulation of the Fermi–Hubbard model4 and Nagaoka ferromagnetism5 have been reported before, the simplest one-dimensional model of strongly correlated topological matter, the many-body Su–Schrieffer–Heeger (SSH) model6–11, has so far remained elusive—mostly owing to the challenge of precisely engineering long-range interactions between electrons to reproduce the chosen Hamiltonian. Here we show that for precision-placed atoms in silicon with strong Coulomb confinement, we can engineer a minimum of six all-epitaxial in-plane gates to tune the energy levels across a linear array of ten quantum dots to realize both the trivial and the topological phases of the many-body SSH model. The strong on-site energies (about 25 millielectronvolts) and the ability to engineer gates with subnanometre precision in a unique staggered design allow us to tune the ratio between intercell and intracell electron transport to observe clear signatures of a topological phase with two conductance peaks at quarter-filling, compared with the ten conductance peaks of the trivial phase. The demonstration of the SSH model in a fermionic system isomorphic to qubits showcases our highly controllable quantum system and its usefulness for future simulations of strongly interacting electrons. Precision-engineered devices consisting of a linear array of ten quantum dots are used to realize both the trivial and topological phases of the many-body Su–Schrieffer–Heeger model.
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Affiliation(s)
- M Kiczynski
- Centre of Excellence for Quantum Computation and Communication Technology, School of Physics, UNSW Sydney, Kensington, New South Wales, Australia.,Silicon Quantum Computing Pty Ltd, UNSW Sydney, Kensington, New South Wales, Australia
| | - S K Gorman
- Centre of Excellence for Quantum Computation and Communication Technology, School of Physics, UNSW Sydney, Kensington, New South Wales, Australia.,Silicon Quantum Computing Pty Ltd, UNSW Sydney, Kensington, New South Wales, Australia
| | - H Geng
- Centre of Excellence for Quantum Computation and Communication Technology, School of Physics, UNSW Sydney, Kensington, New South Wales, Australia.,Silicon Quantum Computing Pty Ltd, UNSW Sydney, Kensington, New South Wales, Australia
| | - M B Donnelly
- Centre of Excellence for Quantum Computation and Communication Technology, School of Physics, UNSW Sydney, Kensington, New South Wales, Australia.,Silicon Quantum Computing Pty Ltd, UNSW Sydney, Kensington, New South Wales, Australia
| | - Y Chung
- Centre of Excellence for Quantum Computation and Communication Technology, School of Physics, UNSW Sydney, Kensington, New South Wales, Australia.,Silicon Quantum Computing Pty Ltd, UNSW Sydney, Kensington, New South Wales, Australia
| | - Y He
- Centre of Excellence for Quantum Computation and Communication Technology, School of Physics, UNSW Sydney, Kensington, New South Wales, Australia.,Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen, China
| | - J G Keizer
- Centre of Excellence for Quantum Computation and Communication Technology, School of Physics, UNSW Sydney, Kensington, New South Wales, Australia.,Silicon Quantum Computing Pty Ltd, UNSW Sydney, Kensington, New South Wales, Australia
| | - M Y Simmons
- Centre of Excellence for Quantum Computation and Communication Technology, School of Physics, UNSW Sydney, Kensington, New South Wales, Australia. .,Silicon Quantum Computing Pty Ltd, UNSW Sydney, Kensington, New South Wales, Australia.
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Bae Y, Heo J, Chung Y, Shin SY, Lee SW. Effect of total cholesterol level variabilities on cerebrovascular disease. Eur Rev Med Pharmacol Sci 2022; 26:544-557. [PMID: 35113431 DOI: 10.26355/eurrev_202201_27882] [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 Hyperlipidemia is a risk factor of cerebrovascular disease (CVD). However, the relationship between CVD and cholesterol variability is less clear. This study assesses the relationship between cholesterol change and CVD risk. PATIENTS AND METHODS We reviewed 480,830 people from 20 to 99 years with 2 health check-ups from 2002 to 2015 from the Korean National Health Insurance (KNHI) database. People's baseline and follow-up cholesterol levels were classified into low (<180 mg/dL), moderate (≥180 mg/dL and <240 mg/dL), and high (≥240 mg/dL). Participants were divided into 9 groups (low-to-low, low-to-moderate, low-to-high, moderate-to-low, moderate-to-moderate, moderate-to-high, high-to-low, high-to-moderate, high-to-high). RESULTS Low to high cholesterol level is associated with hemorrhagic stroke (aHR1 = 1.59; 95% CI 1.12-2.28 and aHR2 = 1.56; 95% CI 1.07-2.25). Low to moderate/high cholesterol level is associated with ischemic stroke and occlusion/stenosis (for low to moderate, aHR1 = 1.11; 95% CI 1.04-1.17 and aHR2 = 1.14; 95% CI 1.07-1.21 for ischemic stroke and aHR1 = 1.18; 95% CI 1.07-1.29 and aHR2 = 1.20; 95% CI 1.08-1.32 for occlusion/stenosis, for low to high, aHR1 = 1.42; 95% CI 1.20-1.67 and aHR2 = 1.28; 95% CI 1.08-1.52 for ischemic stroke and aHR1 = 1.86; 95% CI 1.46-2.36 and aHR2= 1.74; 95% CI 1.36-2.23 for occlusion/stenosis). Moderate to high cholesterol level is associated with ischemic stroke and occlusion/stenosis (for ischemic stroke, aHR1 = 1.12; 95% CI 1.05-1.20 and aHR2 = 1.10; 95% CI 1.03-1.17, for occlusion/stenosis, aHR1 = 1.21; 95% CI 1.10-1.33 and aHR2 = 1.19; 95% CI 1.08-1.32). Moderate to low cholesterol level is associated with ischemic and hemorrhagic stroke and occlusion/stenosis (for ischemic, aHR1 = 1.15; 95% CI 1.09-1.21, for hemorrhagic, aHR1 = 1.14; 95% CI 1.01-1.28, for occlusion/stenosis, aHR1 = 1.14; 95% CI 1.05-1.23). High to low cholesterol level is associated with ischemic stroke and occlusion/stenosis (for ischemic stroke, aHR1 = 1.51; 95% CI 1.33-1.71 and aHR2 = 1.20; 95% CI 1.05-1.36, for occlusion/stenosis, aHR1 = 1.50; 95% CI 1.24-1.81). CONCLUSIONS Our study shows that cholesterol changes, especially larger changes, lead to an increase in CVD, which demonstrates that cholesterol variability may increase CVD.
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Affiliation(s)
- Y Bae
- Department of Neurosurgery, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea.
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11
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Maselli D, Carstens D, Yang D, Mu F, Young J, Cook E, Betts K, Chung Y. P061 BENRALIZUMAB IS EFFECTIVE IN REDUCING ASTHMA EXACERBATIONS: RESULTS FROM THE ZEPHYR 2 STUDY. Ann Allergy Asthma Immunol 2021. [DOI: 10.1016/j.anai.2021.08.090] [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: 11/28/2022]
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12
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Davis G, Schladweiler K, Chung Y, Emmanuel B, Kreindler J, Katial R, Burton T, Blauer-Peterson C, Seare J, Peters A. P504 HEALTH CARE RESOURCE USE AND COST FOR PATIENTS WITH CHRONIC RHINOSINUSITIS WITH NASAL POLYPOSIS. Ann Allergy Asthma Immunol 2020. [DOI: 10.1016/j.anai.2020.08.162] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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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13
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Yen J, Chung Y, Jen C. PD-0535: The Effects of Neoadjuvant Treatment on the Tumor Microenvironment in Rectal Cancer. Radiother Oncol 2020. [DOI: 10.1016/s0167-8140(21)00557-0] [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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14
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Peters A, Schladweiler K, Chung Y, Emmanuel B, Kreindler J, Katial R, Burton T, Blauer-Peterson C, Seare J, Davis G. P510 CHRONIC RHINOSINUSITIS WITH NASAL POLYPOSIS: DEMOGRAPHICS AND CLINICAL CHARACTERISTICS OF PATIENTS BASED ON SURGERY STATUS. Ann Allergy Asthma Immunol 2020. [DOI: 10.1016/j.anai.2020.08.401] [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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15
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van der Kraaij GE, Balak DMW, Busard CI, van Cranenburgh OD, Chung Y, Driessen RJB, de Groot M, de Jong EMGJ, Kemperman PMJH, de Kort WJA, Karsch SA, Lamberts A, Lecluse LLA, van Lümig PPM, Menting SP, Prens EP, van den Reek JMPA, Seyger MMB, Thio HB, Veldkamp WR, Wakkee M, Nast A, Jacobs A, Rosumeck S, Spuls Chair PI. Highlights of the updated Dutch evidence- and consensus-based guideline on psoriasis 2017. Br J Dermatol 2019; 180:31-42. [PMID: 30604536 PMCID: PMC6849803 DOI: 10.1111/bjd.17198] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/02/2018] [Indexed: 12/31/2022]
Abstract
Linked Comment: https://doi.org/10.1111/bjd.17390.
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Affiliation(s)
- G E van der Kraaij
- Department of Dermatology, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands.,Public Health, Infection and Immunity, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands.,Dutch Society of Dermatology and Venereology, Utrecht, the Netherlands
| | - D M W Balak
- University Medical Centre Utrecht, Utrecht, the Netherlands
| | - C I Busard
- Department of Dermatology, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands.,Public Health, Infection and Immunity, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands
| | - O D van Cranenburgh
- Department of Dermatology, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands.,Dutch Skin Foundation, Nieuwegein, the Netherlands
| | - Y Chung
- Dutch Society of Dermatology and Venereology, Utrecht, the Netherlands
| | - R J B Driessen
- Radboud University Medical Centre, Nijmegen, the Netherlands
| | - M de Groot
- Antonius Hospital, Sneek/Emmeloord, the Netherlands
| | - E M G J de Jong
- Radboud University Medical Centre, Nijmegen, the Netherlands.,Radboud University Nijmegen, the Netherlands
| | - P M J H Kemperman
- Department of Dermatology, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands.,Waterlandziekenhuis, Purmerend, the Netherlands
| | | | - S A Karsch
- Dutch Society of Dermatology and Venereology, Utrecht, the Netherlands
| | - A Lamberts
- Dutch Society of Dermatology and Venereology, Utrecht, the Netherlands.,University Medical Center Groningen, Groningen, the Netherlands
| | - L L A Lecluse
- Bergman Clinics and U-clinic, Amsterdam, the Netherlands
| | - P P M van Lümig
- Radboud University Medical Centre, Nijmegen, the Netherlands
| | - S P Menting
- Department of Dermatology, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands
| | - E P Prens
- Erasmus Medical Centre, Rotterdam, the Netherlands
| | | | - M M B Seyger
- Radboud University Medical Centre, Nijmegen, the Netherlands
| | - H B Thio
- Erasmus Medical Centre, Rotterdam, the Netherlands
| | - W R Veldkamp
- Dutch Society of Dermatology and Venereology, Utrecht, the Netherlands.,Radboud University Nijmegen, the Netherlands
| | - M Wakkee
- Erasmus Medical Centre, Rotterdam, the Netherlands
| | - A Nast
- Department of Dermatology, Venereology und Allergy, Division of Evidence-Based Medicine (dEBM), Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Berlin, Germany
| | - A Jacobs
- Department of Dermatology, Venereology und Allergy, Division of Evidence-Based Medicine (dEBM), Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Berlin, Germany
| | - S Rosumeck
- Department of Dermatology, Venereology und Allergy, Division of Evidence-Based Medicine (dEBM), Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Berlin, Germany
| | - P I Spuls Chair
- Department of Dermatology, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands.,Public Health, Infection and Immunity, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands
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16
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Chung Y, Zeiger R, Zimmerman N, Sullivan P, Kreindler J, Tkacz J. D200 RELATIONSHIP BETWEEN SYSTEMIC CORTICOSTEROID USE, ASSOCIATED COMPLICATIONS, AND HEALTHCARE COSTS IN PATIENTS WITH PERSISTENT ASTHMA. Ann Allergy Asthma Immunol 2019. [DOI: 10.1016/j.anai.2019.08.070] [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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17
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Sullivan P, Zeiger R, Kreindler J, Chung Y, Lucci M, Tkacz J. P225 PATTERNS OF SYSTEMIC CORTICOSTEROID EXPOSURE FOR PATIENTS WITH PERSISTENT ASTHMA: A US ADMINISTRATIVE CLAIMS ANALYSIS. Ann Allergy Asthma Immunol 2019. [DOI: 10.1016/j.anai.2019.08.291] [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: 10/25/2022]
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18
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Chung Y, van der Sande AAJ, de Roos KP, Bekkenk MW, de Haas ERM, Kelleners-Smeets NWJ, Kukutsch NA. Poor agreement between the automated risk assessment of a smartphone application for skin cancer detection and the rating by dermatologists. J Eur Acad Dermatol Venereol 2019; 34:274-278. [PMID: 31423673 PMCID: PMC7027514 DOI: 10.1111/jdv.15873] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2019] [Accepted: 07/19/2019] [Indexed: 12/03/2022]
Abstract
Background Several smartphone applications (app) with an automated risk assessment claim to be able to detect skin cancer at an early stage. Various studies that have evaluated these apps showed mainly poor performance. However, all studies were done in patients and lesions were mainly selected by a specialist. Objectives To investigate the performance of the automated risk assessment of an app by comparing its assessment to that of a dermatologist in lesions selected by the participants. Methods Participants of a National Skin Cancer Day were enrolled in a multicentre study. Skin lesions indicated by the participants were analysed by the automated risk assessment of the app prior to blinded rating by the dermatologist. The ratings of the automated risk assessment were compared to the assessment and diagnosis of the dermatologist. Due to the setting of the Skin Cancer Day, lesions were not verified by histopathology. Results We included 125 participants (199 lesions). The app was not able to analyse 90 cases (45%) of which nine BCC, four atypical naevi and one lentigo maligna. Thirty lesions (67%) with a high and 21 with a medium risk (70%) rating by the app were diagnosed as benign naevi or seborrhoeic keratoses. The interobserver agreement between the ratings of the automated risk assessment and the dermatologist was poor (weighted kappa = 0.02; 95% CI −0.08‐0.12; P = 0.74). Conclusions The rating of the automated risk assessment was poor. Further investigations about the diagnostic accuracy in real‐life situations are needed to provide consumers with reliable information about this healthcare application.
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Affiliation(s)
- Y Chung
- Dutch Society of Dermatology and Venereology, Utrecht, The Netherlands
| | | | - K P de Roos
- Dutch Society of Dermatology and Venereology, Utrecht, The Netherlands.,Dermapark, Uden, The Netherlands
| | - M W Bekkenk
- Department of Dermatology, Academic Medical Center and Vrije University Medical Center, Amsterdam, The Netherlands
| | - E R M de Haas
- Department of Dermatology, Erasmus Medical Center, Rotterdam, The Netherlands
| | - N W J Kelleners-Smeets
- Department of Dermatology, Maastricht University Medical Center, Maastricht, The Netherlands
| | - N A Kukutsch
- Department of Dermatology, Leiden University Medical Center, Leiden, The Netherlands
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Lee J, Chung Y, Kim S, Lee H, Kang J, Shon Y, Na D. A feasibility study with a novel, subcutaneous extracranial brain stimulator in a beagle model for non-invasive human neuromodulation. Brain Stimul 2019. [DOI: 10.1016/j.brs.2018.12.865] [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: 10/27/2022] Open
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20
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Kim J, Chung Y, Lee J, Nam E, Kim S, Kim Y, Kim S. Comparison of Surgical Outcomes and 2-Year Disease Progression Free Survival Rate between Single-Port Access Staging Laparoscopy and Conventional Staging Laparoscopy in Uterine Cancer. J Minim Invasive Gynecol 2018. [DOI: 10.1016/j.jmig.2018.09.378] [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: 10/28/2022]
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21
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Kim M, Chung Y, Hwang H, Namkung J, Han Y. Robot assisted laparoscopic myomectomy for submucosal myoma. Fertil Steril 2018. [DOI: 10.1016/j.fertnstert.2018.07.1137] [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: 10/28/2022]
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22
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Choi Y, Chung Y, Kim J, Hong M, Chae S, Hwang K, Yoon S. Association between polycystic ovary syndrome and the polymorphisms of aryl hydrocarbon receptor repressor, glutathione-s-transferase T1, and glutathione-S-transferase M1 genes. Fertil Steril 2018. [DOI: 10.1016/j.fertnstert.2018.07.357] [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: 11/27/2022]
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Ruschel VC, Shibata S, Stolf SC, Chung Y, Baratieri LN, Heymann HO, Walter R. Eighteen-month Clinical Study of Universal Adhesives in Noncarious Cervical Lesions. Oper Dent 2018; 43:241-249. [PMID: 29676975 DOI: 10.2341/16-320-c] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
OBJECTIVE To evaluate the clinical performance of Scotchbond Universal (3M Oral Care) and Prime & Bond Elect (Dentsply Sirona) in the restoration of noncarious cervical lesions (NCCLs). METHODS AND MATERIALS This was a randomized controlled clinical trial involving 63 subjects. Two hundred and three NCCLs were restored using Scotchbond Universal and Prime & Bond Elect using both an etch-and-rinse and a self-etch technique. Lesions were notch-shaped NCCLs, and the restorations were placed without any mechanical retention. Restorations were finished immediately after placement and scored with regard to retention, marginal discoloration, marginal adaptation, and secondary caries. Similar assessment of the restorations was performed 18 months after placement. Logistic regression was performed for each outcome separately with a compound symmetric variance-covariance structure assumed to consider a correlation of restorations within subjects. All analyses were conducted using SAS version 9.4 (SAS Inc). RESULTS One hundred and fifty-eight teeth (77.8% of the restorations placed) in 46 subjects (73% of subjects enrolled) were available for the 18-month follow-up. A statistically significant difference was reached only for the comparison Scotchbond Universal/self-etch (SU_SE) and Prime & Bond Elect/etch-and-rinse (PBE_E&R) groups ( p=0.01), where a restoration with SU_SE was 66% less likely to maintain a score of Alpha for marginal discoloration than a restoration performed with PBE_E&R. CONCLUSIONS Scotchbond Universal and Prime & Bond Elect presented acceptable clinical performance after 18 months of clinical service. However, Scotchbond Universal, when applied with a self-etch approach, did demonstrate a relatively high level of marginal discoloration when compared to the other groups.
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Ryu K, Kim Y, Chung Y, Chey Y, Kang Y. C-43Relationship Between Vocabulary And Verbal / Visual Memory For Baseline Use Of Memory Impairment. Arch Clin Neuropsychol 2017. [DOI: 10.1093/arclin/acx076.210] [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: 11/12/2022] Open
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25
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Chung Y, Choi Y. TRANSCRIPTIONAL PROFILING OF HUMAN FEMORAL MESENCHYMAL STEM CELLS IN OSTEOPOROSIS AND ADIPOGENESIS. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.2043] [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: 11/13/2022] Open
Affiliation(s)
- Y. Chung
- Endocrinology, Ajou University School of Medicine, Suwon, Korea (the Republic of)
| | - Y. Choi
- Endocrinology, Ajou University School of Medicine, Suwon, Korea (the Republic of)
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Kim C, Nam D, Kong D, Kang S, Jang J, Kim J, Lim Y, Koh Y, Chung Y, Kim J. OS09.7 Phase III radomized trial of autologous cytokine-induced killer cell immunotherapy for newly diagnosed glioblastoma in Korea. Neuro Oncol 2017. [DOI: 10.1093/neuonc/nox036.066] [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: 11/14/2022] Open
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Chung Y, Cecere R, Mongrain R, Azar T. A NOVEL DUAL-ANGLE BLADE, CORELESS VENTRICULAR ASSIST DEVICE. Can J Cardiol 2016. [DOI: 10.1016/j.cjca.2016.07.269] [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: 10/20/2022] Open
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28
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Han HR, Lee JE, Kim K, Chung Y, Kim MT, Robinson C, Lee M. Healthcare utilization among North Korean refugees in South Korea: a mixed methods study. Public Health 2016; 142:116-120. [PMID: 27592505 DOI: 10.1016/j.puhe.2016.07.021] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2015] [Revised: 07/23/2016] [Accepted: 07/29/2016] [Indexed: 11/16/2022]
Affiliation(s)
- H R Han
- The Johns Hopkins University School of Nursing, Baltimore, MD, USA.
| | - J E Lee
- Catholic University of Korea College of Nursing, Seoul, Republic of Korea
| | - K Kim
- The Johns Hopkins University School of Nursing, Baltimore, MD, USA
| | - Y Chung
- The Johns Hopkins University School of Nursing, Baltimore, MD, USA
| | - M T Kim
- University of Texas at Austin School of Nursing, Austin, TX, USA
| | - C Robinson
- The Johns Hopkins University Bloomberg School of Public Health, Baltimore, MD, USA
| | - M Lee
- Yonsei University School of Public Health, Seoul, Republic of Korea
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Sung-Woo C, Kim Y, Kim Y, Chung Y. The clinical efficacy of N-Methyl D-Aspartate receptor antagonist for parkinson's disease dementia: brain perfusion spect study. J Neurol Sci 2015. [DOI: 10.1016/j.jns.2015.08.444] [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: 10/22/2022]
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Kim J, Park C, Kauweloa K, Chung Y, Han Y, Ju S. TU-CD-207-05: A Novel Digital Tomosynthesis System Using Orthogonal Scanning Technique: A Feasibility Study. Med Phys 2015. [DOI: 10.1118/1.4925624] [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: 11/07/2022] Open
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Chung Y, Shin J, Yu J, Park W, Choi D, Huh S, Han Y, Kim J. SU-E-T-292: Dosimetric Advantage of Prone Breast Radiotherapy for Korean Left-Sided Breast Cancer Patients. Med Phys 2015. [DOI: 10.1118/1.4924654] [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: 11/07/2022] Open
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Cheng S, Chung Y, Liu M, Tsou J, Chen S, Kuo T, Lin N. The investigation of effects of upper extremity exercise program on hand functions in patients on maintenance hemodialysis. Physiotherapy 2015. [DOI: 10.1016/j.physio.2015.03.399] [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: 11/27/2022]
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Lee J, Hur E, Jung S, Choi Y, Goo B, Moon J, Choi E, Chung Y, Kim Y. 161 CYTOGENETIC CHARACTERIZATION OF AZACITIDINE-RESISTANT CELL LINE (MOLM/AZA-1) ESTABLISHED FROM AML/MDS CELL LINE (MOLM-13). Leuk Res 2015. [DOI: 10.1016/s0145-2126(15)30162-4] [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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Kim C, Lee N, Yoon W, Chung Y, Lee N. PO-0796: Volumetric analysis of MRI response in meninigiomas treated with 3-dimensional conformal radiation therapy. Radiother Oncol 2015. [DOI: 10.1016/s0167-8140(15)40788-1] [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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Mehta A, Verma V, Nandihalli M, Ramachandra CJA, Sequiera GL, Sudibyo Y, Chung Y, Sun W, Shim W. A systemic evaluation of cardiac differentiation from mRNA reprogrammed human induced pluripotent stem cells. PLoS One 2014; 9:e103485. [PMID: 25068310 PMCID: PMC4113436 DOI: 10.1371/journal.pone.0103485] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2014] [Accepted: 07/02/2014] [Indexed: 11/19/2022] Open
Abstract
Genetically unmodified cardiomyocytes mandated for cardiac regenerative therapy is conceivable by “foot-print free” reprogramming of somatic cells to induced pluripotent stem cells (iPSC). In this study, we report generation of foot-print free hiPSC through messenger RNA (mRNA) based reprograming. Subsequently, we characterize cardiomyocytes derived from these hiPSC using molecular and electrophysiological methods to characterize their applicability for regenerative medicine. Our results demonstrate that mRNA-iPSCs differentiate ontogenetically into cardiomyocytes with increased expression of early commitment markers of mesoderm, cardiac mesoderm, followed by cardiac specific transcriptional and sarcomeric structural and ion channel genes. Furthermore, these cardiomyocytes stained positively for sarcomeric and ion channel proteins. Based on multi-electrode array (MEA) recordings, these mRNA-hiPSC derived cardiomyocytes responded predictably to various pharmacologically active drugs that target adrenergic, sodium, calcium and potassium channels. The cardiomyocytes responded chronotropically to isoproterenol in a dose dependent manner, inotropic activity of nifidipine decreased spontaneous contractions. Moreover, Sotalol and E-4031 prolonged QT intervals, while TTX reduced sodium influx. Our results for the first time show a systemic evaluation based on molecular, structural and functional properties of cardiomyocytes differentiated from mRNA-iPSC. These results, coupled with feasibility of generating patient-specific iPSCs hold great promise for the development of large-scale generation of clinical grade cardiomyocytes for cardiac regenerative medicine.
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Affiliation(s)
- Ashish Mehta
- National Heart Research Institute Singapore, National Heart Centre, Singapore, Singapore
- * E-mail: (AM); (WS)
| | - Vinod Verma
- National Heart Research Institute Singapore, National Heart Centre, Singapore, Singapore
| | - Manasi Nandihalli
- National Heart Research Institute Singapore, National Heart Centre, Singapore, Singapore
| | | | - Glen L. Sequiera
- National Heart Research Institute Singapore, National Heart Centre, Singapore, Singapore
| | - Yuliansa Sudibyo
- National Heart Research Institute Singapore, National Heart Centre, Singapore, Singapore
| | - Yingying Chung
- National Heart Research Institute Singapore, National Heart Centre, Singapore, Singapore
| | - William Sun
- Experimental and Therapeutics Centre, A’STAR, Singapore, Singapore
| | - Winston Shim
- National Heart Research Institute Singapore, National Heart Centre, Singapore, Singapore
- Cardiovascular and Metabolic Disorders Program, DUKE-NUS, Singapore, Singapore
- * E-mail: (AM); (WS)
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Chung Y, Lee J, Oh S, Park D, Chang HH, Kim S. Automatic Detection of Cow's Oestrus in Audio Surveillance System. Asian-Australas J Anim Sci 2014; 26:1030-7. [PMID: 25049882 PMCID: PMC4093488 DOI: 10.5713/ajas.2012.12628] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/09/2012] [Revised: 03/03/2013] [Accepted: 01/29/2013] [Indexed: 12/21/2022]
Abstract
Early detection of anomalies is an important issue in the management of group-housed livestock. In particular, failure to detect oestrus in a timely and accurate way can become a limiting factor in achieving efficient reproductive performance. Although a rich variety of methods has been introduced for the detection of oestrus, a more accurate and practical method is still required. In this paper, we propose an efficient data mining solution for the detection of oestrus, using the sound data of Korean native cows (Bos taurus coreanea). In this method, we extracted the mel frequency cepstrum coefficients from sound data with a feature dimension reduction, and use the support vector data description as an early anomaly detector. Our experimental results show that this method can be used to detect oestrus both economically (even a cheap microphone) and accurately (over 94% accuracy), either as a standalone solution or to complement known methods.
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Affiliation(s)
- Y Chung
- Department of Computer and Information Science, College of Science and Technology, Korea University, Sejong 339-700, Korea
| | - J Lee
- Department of Computer and Information Science, College of Science and Technology, Korea University, Sejong 339-700, Korea
| | - S Oh
- Department of Computer and Information Science, College of Science and Technology, Korea University, Sejong 339-700, Korea
| | - D Park
- Department of Computer and Information Science, College of Science and Technology, Korea University, Sejong 339-700, Korea
| | - H H Chang
- Department of Computer and Information Science, College of Science and Technology, Korea University, Sejong 339-700, Korea
| | - S Kim
- Department of Computer and Information Science, College of Science and Technology, Korea University, Sejong 339-700, Korea
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Wang C, Nguyen G, Chung Y, Cabrera F, Shin R, Lipkin M, Yoshizumi T. SU-C-18C-04: Evaluation of Effective Dose During Ureteroscopy for Obese and Non-Obese Patients. Med Phys 2014. [DOI: 10.1118/1.4887838] [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: 11/07/2022] Open
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Chung Y, Fu E. Cyclosporine A up-regulates Sonic hedgehog in gingiva: role of the up-regulation on gingival cell proliferation. J Periodontal Res 2014; 49:810-6. [PMID: 24823913 DOI: 10.1111/jre.12168] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/21/2013] [Indexed: 11/28/2022]
Abstract
BACKGROUND AND OBJECTIVE Sonic hedgehog protein (SHH) is a mitogen that stimulates cell proliferation. Cyclosporine A enhances the proliferation of gingival cells; however, the relationships of SHH to cyclosporine A or to cyclosporine A-enhanced gingival cell proliferation have not been described. MATERIAL AND METHODS Here, we investigated SHH expression in gingiva in vitro and in vivo after cyclosporine A treatment and tested the effect of SHH inhibition on cyclosporine A-enhanced gingival fibroblast proliferation in vitro. RESULTS In human gingival fibroblasts, cyclosporine A treatment increased the expression of SHH transcripts and SHH protein, and stimulated cell proliferation; the addition of cyclopamine, an SHH signaling inhibitor, suppressed cyclosporine A-enhanced cell proliferation. Up-regulated expression of SHH and up-regulation of proliferating cell nuclear antigen transcripts and protein were observed in the edentulous gingiva of cyclosporine A-treated rats. CONCLUSION Cyclosporine A up-regulates gingival SHH expression in vitro and in vivo, and the inhibition of the SHH pathway counteracts the stimulatory effect of cyclosporine A on gingival fibroblast proliferation. Therefore, we suggest that SHH mediates a novel molecular mechanism for cyclosporine A-induced gingival complications.
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Affiliation(s)
- Y Chung
- Graduate Institute of Life Sciences, National Defense Medical Center, Taipei, Taiwan, China; Department of Periodontology, School of Dentistry, National Defense Medical Center and Tri-Service General Hospital, Taipei, Taiwan, China
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Chung Y, Yoon HI, Ha JS, Kim S, Lee IJ. A Feasibility Study of a Tilted Head Position in Helical Tomotherapy for Fractionated Stereotactic Radiotherapy of Intracranial Malignancies. Technol Cancer Res Treat 2014:tcrt.2012.50042. [PMID: 24645743 DOI: 10.7785/tcrt.2012.500420] [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: 02/28/2024] Open
Abstract
Herein, we evaluated the feasibility of placing patients in a tilted head position as part of routine clinical practice for fractionated stereotactic radiotherapy (FSRT) of intracranial tumors using helical tomotherapy (HT), by assessing its dosimetric benefit and setup accuracy. We reviewed treatment plans of four cases that were to receive FSRT for brain lesions in normal and head-tilted positions. These patients underwent two computed tomography (CT) scans: first in the normal supine position and then in the supine position with the head tilted at a 458 angle. Two separate HT plans for each position were generated in these four patients, using the same planning parameters. Plans were compared for target conformity and dose homogeneity. Maximum and average doses to critical organs, including normal brain, brain stem, optic chiasm, optic nerves, and the eyes, were considered. To evaluate setup accuracy, patient movement during treatment was assessed by post-treatment megavoltage CT scans. Both HT plans achieved similar conformal and homogeneous dose coverage to the target. Head-tilted HT delivered lower average and maximum doses to critical organs in the cases where the tumor was located on the same plane with critical organs, particularly when they were not directly attached. Placement in the head-tilted position without a mouthpiece allowed for increased patient movement during treatment, while use of a mouthpiece reduced patient movement to even less than that observed for normal setup in the supine position. This pilot study showed that placement in a tilted head position for FSRT of intracranial tumors using HT may be of clinical use, but depends on the tumor location.
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Affiliation(s)
- Y Chung
- Department of Radiation Oncology, Yonsei University College of Medicine, Seoul, Republic of Korea.
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Mehta A, Sequiera GL, Ramachandra CJA, Sudibyo Y, Chung Y, Sheng J, Wong KY, Tan TH, Wong P, Liew R, Shim W. Re-trafficking of hERG reverses long QT syndrome 2 phenotype in human iPS-derived cardiomyocytes. Cardiovasc Res 2014; 102:497-506. [PMID: 24623279 DOI: 10.1093/cvr/cvu060] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
AIMS Long QT syndrome 2 (LQTS2) caused by missense mutations in hERG channel is clinically associated with abnormally prolonged ventricular repolarization and sudden cardiac deaths. Modelling monogenic arrhythmogenic diseases using human-induced pluripotent stem cells (hiPSCs) offers unprecedented mechanistic insights into disease pathogenesis. We utilized LQTS2-hiPSC-derived cardiomyocytes (CMs) to elucidate pathological changes and to demonstrate reversal of LQTS2 phenotype in a therapeutic intervention using a pharmacological agent, (N-[N-(N-acetyl-l-leucyl)-l-leucyl]-l-norleucine) (ALLN). METHODS AND RESULTS We generated LQTS2-specific CMs (A561V missense mutation in KCNH2) from iPSCs using the virus-free reprogramming method. These CMs recapitulate dysfunction of hERG potassium channel with diminished IKr currents, prolonged repolarization durations, and elevated arrhythmogenesis due to reduced membrane localization of glycosylated/mature hERG. Dysregulated expression of folding chaperones and processing proteasomes coupled with sequestered hERG in the endoplasmic reticulum confirmed trafficking-induced disease manifestation. Treatment with ALLN, not only increased membrane localization of mature hERG but also reduced repolarization, increased IKr currents and reduced arrhythmogenic events. Diverged from biophysical interference of hERG channel, our results show that modulation of chaperone proteins could be therapeutic in LQTS2 treatment. CONCLUSION Our in vitro study shows an alternative approach to rescue diseased LQTS2 phenotype via corrective re-trafficking therapy using a small chemical molecule, such as ALLN. This potentially novel approach may have ramifications in other clinically relevant trafficking disorders.
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Affiliation(s)
- Ashish Mehta
- Research and Development Unit, National Heart Centre Singapore, Singapore National Heart Research Institute Singapore, Singapore
| | | | | | - Yuliansa Sudibyo
- Research and Development Unit, National Heart Centre Singapore, Singapore
| | - Yingying Chung
- Research and Development Unit, National Heart Centre Singapore, Singapore
| | - Jingwei Sheng
- Research and Development Unit, National Heart Centre Singapore, Singapore
| | - Keng Yean Wong
- Department of Paediatrics, KK Women's and Children Hospital, Singapore
| | - Teng Hong Tan
- Department of Paediatrics, KK Women's and Children Hospital, Singapore
| | - Philip Wong
- Department of Cardiology, National Heart Centre Singapore, Singapore Cardiovascular and Metabolic Disorders Program, DUKE-NUS, Singapore
| | - Reginald Liew
- Department of Cardiology, National Heart Centre Singapore, Singapore Cardiovascular and Metabolic Disorders Program, DUKE-NUS, Singapore
| | - Winston Shim
- Research and Development Unit, National Heart Centre Singapore, Singapore National Heart Research Institute Singapore, Singapore Cardiovascular and Metabolic Disorders Program, DUKE-NUS, Singapore
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Seo M, Hong C, Lee SY, Choi HK, Kim N, Chung Y, Umansky V, Mahalu D. Multi-valued logic gates based on ballistic transport in quantum point contacts. Sci Rep 2014; 4:3806. [PMID: 24448272 PMCID: PMC3897954 DOI: 10.1038/srep03806] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2013] [Accepted: 12/23/2013] [Indexed: 11/22/2022] Open
Abstract
Multi-valued logic gates, which can handle quaternary numbers as inputs, are developed by exploiting the ballistic transport properties of quantum point contacts in series. The principle of a logic gate that finds the minimum of two quaternary number inputs is demonstrated. The device is scalable to allow multiple inputs, which makes it possible to find the minimum of multiple inputs in a single gate operation. Also, the principle of a half-adder for quaternary number inputs is demonstrated. First, an adder that adds up two quaternary numbers and outputs the sum of inputs is demonstrated. Second, a device to express the sum of the adder into two quaternary digits [Carry (first digit) and Sum (second digit)] is demonstrated. All the logic gates presented in this paper can in principle be extended to allow decimal number inputs with high quality QPCs.
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Affiliation(s)
- M Seo
- Department of Physics, Pusan National University, Busan, 609-735, Republic of Korea
| | - C Hong
- Department of Physics, Pusan National University, Busan, 609-735, Republic of Korea
| | - S-Y Lee
- 1] Department of Physics, Pusan National University, Busan, 609-735, Republic of Korea [2] School of Electronics Engineering, Kyungpook National University, Daegu, 702-701, Republic of Korea
| | - H K Choi
- Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot, 76100, Israel
| | - N Kim
- Korea Research Institute of Standard and Science, Daejeon, 306-600, Republic of Korea
| | - Y Chung
- Department of Physics, Pusan National University, Busan, 609-735, Republic of Korea
| | - V Umansky
- Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot, 76100, Israel
| | - D Mahalu
- Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot, 76100, Israel
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Lee J, Suh C, Lee H, Yoon J, Park K, Chung Y, Choi W, Kim J. EP-1472: Reducing effectiveness of hair loss by additional lead block for electron treatment of eyelid lesion patients. Radiother Oncol 2014. [DOI: 10.1016/s0167-8140(15)31590-5] [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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Lee H, Yoon J, Lee J, Park K, Chung Y, Choi W. EP-1724: Fast scan and low dose megavoltage CT reconstruction via a compressed censing with prior image constraints in IGRT. Radiother Oncol 2014. [DOI: 10.1016/s0167-8140(15)31842-9] [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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Song J, Chung Y, Kim Y, Lee J, Lee N, Bae H. Circulating endothelial progenitor cells in gynecologic cancer. Gynecol Oncol 2013. [DOI: 10.1016/j.ygyno.2013.04.449] [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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45
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Seo M, Choi HK, Lee SY, Kim N, Chung Y, Sim HS, Umansky V, Mahalu D. Charge frustration in a triangular triple quantum dot. Phys Rev Lett 2013; 110:046803. [PMID: 25166188 DOI: 10.1103/physrevlett.110.046803] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2012] [Indexed: 06/03/2023]
Abstract
We experimentally investigate the charge (isospin) frustration induced by a geometrical symmetry in a triangular triple quantum dot. We observe the ground-state charge configurations of sixfold degeneracy, the manifestation of the frustration. The frustration results in omnidirectional charge transport, and it is accompanied by nearby nontrivial triple degenerate states in the charge stability diagram. The findings agree with a capacitive interaction model. We also observe unusual transport by the frustration, which might be related to elastic cotunneling and the interference of trajectories through the dot. This work demonstrates a unique way of studying geometrical frustration in a controllable way.
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Affiliation(s)
- M Seo
- Department of Physics, Pusan National University, Busan 609-735, Republic of Korea
| | - H K Choi
- Braun Center for Submicron Research, Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 76100, Israel
| | - S-Y Lee
- Department of Physics, Pusan National University, Busan 609-735, Republic of Korea
| | - N Kim
- Korea Research Institute of Standard and Science, Daejeon 306-600, Republic of Korea
| | - Y Chung
- Department of Physics, Pusan National University, Busan 609-735, Republic of Korea
| | - H-S Sim
- Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea
| | - V Umansky
- Braun Center for Submicron Research, Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 76100, Israel
| | - D Mahalu
- Braun Center for Submicron Research, Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 76100, Israel
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46
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Chung Y, Kelsey C, Das S. The Impact of Anatomical Changes During the Course of Intensity Modulated Radiation Therapy (IMRT) for Lung Cancer. Int J Radiat Oncol Biol Phys 2012. [DOI: 10.1016/j.ijrobp.2012.07.1505] [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: 10/27/2022]
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47
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Takatsuka S, Chung Y, Yamada N, Sawada T, Seki S, Funae Y, Sowa M. Characterization and purification of angiogenic factor derived from highly liver metastatic colon cancer cells. Int J Oncol 2012; 11:1035-40. [PMID: 21528301 DOI: 10.3892/ijo.11.5.1035] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
We investigated the effects of serum-free conditioned medium (SFCM) of colon cancer cells on human umbilical vein endothelial cells (HUVECs). SFCM of highly liver metastatic cell line (LM-HS) strongly enhanced proliferation, migration and tube formation of HUVECs. Moreover, it was suggested that a main angiogenic factor derived from LM-H5 may be VEGF based on HPLC, SDS-PAGE analysis and neutralizing experiment using anti-growth factor antibodies. These findings suggest that angiogenesis is related to the processes of metastasis of colon cancer, and that VEGF synthesized by colon cancer cells acts as a key factor inducing angiogenesis.
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Affiliation(s)
- S Takatsuka
- OSAKA CITY UNIV,SCH MED,DEPT SURG 1,ABENO KU,OSAKA 545,JAPAN. OSAKA CITY UNIV,SCH MED,DEPT INTERNAL MED 3,ABENO KU,OSAKA 545,JAPAN. OSAKA CITY UNIV,SCH MED,CHEM LAB,ABENO KU,OSAKA 545,JAPAN
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Nakata B, Appert H, Lei S, Yamashita Y, Chung Y, Sowa M, Myles J, Mao C, Howard J. Immunohistochemical study on cathepsin-B and cathepsin-d in pancreatic-cancer. Oncol Rep 2012; 1:543-6. [PMID: 21607400 DOI: 10.3892/or.1.3.543] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
Lysosomal enzymes, cathepsin B and D, have been studied in their possible relationship to the ability of malignant cells to invade and metastasize. In the current investigation, these cathepsins were detected immunohistochemically using avidin-biotin-peroxidase complex method in the pancreatic cancer cells of 21 patients. The positive rate of identification of cathepsin B and D was 43% and 81%, respectively. Cathepsin D stained more strongly than cathepsin B and the plasma membrane stained quite strongly in two instances. A correlation between the presence of cathepsin B or D in cancer cells and the degree of metastasis to lymph nodes, liver, or lung was not recognized.
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Affiliation(s)
- B Nakata
- MED COLL OHIO,DEPT SURG,TOLEDO,OH 43699. MED COLL OHIO,DEPT PATHOL,TOLEDO,OH 43699. TOLEDO HOSP,TOLEDO,OH 43606
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Yamada N, Chung Y, Ohtani H, Ikeda T, Onoda N, Sawada T, Nishiguchi Y, Hasuma T, Sowa M. Establishment and characterization of a new human gallbladder carcinoma cell line (OCUG-1) producing TA-4. Int J Oncol 2012; 10:1251-5. [PMID: 21533512 DOI: 10.3892/ijo.10.6.1251] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
A new human cell line (OCUG-1) was established from peritoneal effusion of a patient with malignant gallbladder carcinoma. OCUG-1 cells proliferated mainly in clusters of cells partially floating in a monolayered sheet. The population doubling time is 47.1 h. DNA analysis showed that OCUG-1 cells were aneuploid and had two G(0)/G(1) peaks. The number of chromosomes was distributed in a broad range from 52 to 139. Subcutaneous injections of the cells induced tumor formation in all nude mice. The reconstituted tumors were poorly differentiated adenocarcinoma. High levels of SLX, CA19-9, SPan-1 and TA-4 were found in the serum of the original patient, but OCUG-1 cells produced only TA-4. We speculate that OCUG-1 may be a transitional form from adenocarcinoma to squamous cell carcinoma. Since OCUG-1 produces a high level of TA-4, it will be useful for the study of the biological nature of this carcinoma and the relationship between the expression of TA-4 and squamatization.
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Affiliation(s)
- N Yamada
- OSAKA CITY UNIV,SCH MED,DEPT SURG 1,ABENO KU,OSAKA 545,JAPAN. OSAKA CITY UNIV,SCH MED,DEPT BIOCHEM 1,ABENO KU,OSAKA 545,JAPAN
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Yasukawa K, Kaneko T, Iba Y, Hirayama K, Kondo Y, Sawada T, Sowa M, Ho J, Kim Y, Chung Y. Preparation of mouse-human chimeric antibody against pancreatic cancer-associated mucin. Int J Oncol 2012; 6:1047-51. [PMID: 21556638 DOI: 10.3892/ijo.6.5.1047] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
A murine monoclonal antibody, designated Nd2, was generated using a purified mucin from the human pancreatic cancer cell line SW1990 as the immunogen. Administration of Nd2 into the patients with pancreatic cancer has shown that Nd2 is of clinical use for in vivo diagnostics of pancreatic cancer. In this study, starting with a previously established hybridoma producing Nd2, we have established a transfected cell line expressing a recombinant chimeric Nd2 composed of mouse-derived antigen-binding variable regions and human-derived constant regions. The chimeric Nd2 was shown to bind purified mucin from SW1990 cells with the same dose-response curve as the original Nd2. Immunohistochemical experiments have shown that the reactivity of the chimeric Nd2 in normal and malignant pancreatic tissue is also the same as that of the original Nd2. Replacement of a substantial portion of the mouse protein makes this chimeric Nd2 more promising for clinical application than the original mouse-derived Nd2 because its antigenicity is expected to be reduced.
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Affiliation(s)
- K Yasukawa
- OSAKA CITY UNIV,SCH MED,DEPT SURG 1,ABENO KU,OSAKA 545,JAPAN. UNIV CALIF SAN FRANCISCO,VET AFFAIRS MED CTR,GASTROINTESTINAL RES LAB,SAN FRANCISCO,CA. UNIV CALIF SAN FRANCISCO,DEPT MED,SAN FRANCISCO,CA
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