1,190 results on '"J Baek"'
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2. Charge order textures induced by non-linear couplings in a half-doped manganite
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Ismail El Baggari, David J. Baek, Michael J. Zachman, Di Lu, Yasuyuki Hikita, Harold Y. Hwang, Elizabeth A. Nowadnick, and Lena F. Kourkoutis
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Science - Abstract
In this paper, the authors demonstrate that cryogenic scanning transmission electron microscopy allows for the direct mapping of the local arrangements and symmetries of electronic order, providing a useful method for studying strongly correlated systems. They show this using the example of Nd1/2Sr1/2MnO3, a model charge ordered material.
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- 2021
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3. The Environment and Climate Change Canada Carbon Assimilation System (EC-CAS v1.0): demonstration with simulated CO observations
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V. Khade, S. M. Polavarapu, M. Neish, P. L. Houtekamer, D. B. A. Jones, S.-J. Baek, T.-L. He, and S. Gravel
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Geology ,QE1-996.5 - Abstract
In this study, we present the development of a new coupled weather and carbon monoxide (CO) data assimilation system based on the Environment and Climate Change Canada (ECCC) operational ensemble Kalman filter (EnKF). The estimated meteorological state is augmented to include CO. Variable localization is used to prevent the direct update of meteorology by the observations of the constituents and vice versa. Physical localization is used to damp spurious analysis increments far from a given observation. Perturbed surface flux fields are used to account for the uncertainty in CO due to errors in the surface fluxes. The system is demonstrated for the estimation of three-dimensional CO states using simulated observations from a variety of networks. First, a hypothetically dense, uniformly distributed observation network is used to demonstrate that the system is working. More realistic observation networks, based on surface hourly observations, and space-based observations provide a demonstration of the complementarity of the different networks and further confirm the reasonable behavior of the coupled assimilation system. Having demonstrated the ability to estimate CO distributions, this system will be extended to estimate surface fluxes in the future.
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- 2021
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4. Disentangling types of lattice disorder impacting superconductivity in Sr2RuO4 by quantitative local probes
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Berit H. Goodge, Hari P. Nair, David J. Baek, Nathaniel J. Schreiber, Ludi Miao, Jacob P. Ruf, Emily N. Waite, Philip M. Carubia, Kyle M. Shen, Darrell G. Schlom, and Lena F. Kourkoutis
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Biotechnology ,TP248.13-248.65 ,Physics ,QC1-999 - Abstract
The unconventional superconductivity in Sr2RuO4 is infamously susceptible to suppression by small levels of disorder such that it has been most commonly studied in extremely high-purity bulk crystals. Here, we harness local structural and spectroscopic scanning transmission electron microscopy measurements in epitaxial thin films of Sr2RuO4 to disentangle the impact of different types of crystalline disorder on superconductivity. We find that cation off-stoichiometry during growth gives rise to two distinct types of disorder: mixed-phase structural inclusions that accommodate excess ruthenium and ruthenium vacancies when the growth is ruthenium-deficient. Several superconducting films host mixed-phase intergrowths, suggesting this microstructural disorder has relatively little impact on superconductivity. In a non-superconducting film, on the other hand, we measure a high density of ruthenium-vacancies (∼14%) with no significant reduction in the crystallinity of the film. The results suggest that ruthenium vacancy disorder, which is hidden to many structural probes, plays an important role in suppressing superconductivity. We discuss the broader implications of our findings to guide the future synthesis of this and other layered systems.
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- 2022
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5. P461: MYELOID KINOME INHIBITOR HM43239 OVERCOMES ACQUIRED RESISTANCE IN ACUTE MYELOID LEUKEMIA MODELS
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R. Bejar, S. J. Baek, N. Abbasi, A. Krasny, R. Sinha, H. Zhang, S. Howell, and W. Rice
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Diseases of the blood and blood-forming organs ,RC633-647.5 - Published
- 2022
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6. Gamma-induced background in the KATRIN main spectrometer
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K. Altenmüller, M. Arenz, W.-J. Baek, M. Beck, A. Beglarian, J. Behrens, A. Berlev, U. Besserer, K. Blaum, F. Block, S. Bobien, T. Bode, B. Bornschein, L. Bornschein, H. Bouquet, T. Brunst, N. Buzinsky, S. Chilingaryan, W. Q. Choi, M. Deffert, P. J. Doe, O. Dragoun, G. Drexlin, S. Dyba, K. Eitel, E. Ellinger, R. Engel, S. Enomoto, M. Erhard, D. Eversheim, M. Fedkevych, J. A. Formaggio, F. M. Fränkle, G. B. Franklin, F. Friedel, A. Fulst, W. Gil, F. Glück, A. Gonzalez Ureña, R. Grössle, R. Gumbsheimer, M. Hackenjos, V. Hannen, F. Harms, N. Haußmann, F. Heizmann, K. Helbing, W. Herz, S. Hickford, D. Hilk, D. Hillesheimer, M. A. Howe, A. Huber, A. Jansen, C. Karl, J. Kellerer, N. Kernert, L. Kippenbrock, M. Klein, A. Kopmann, M. Korzeczek, A. Kovalík, B. Krasch, A. Kraus, M. Kraus, T. Lasserre, O. Lebeda, B. Lehnert, J. Letnev, A. Lokhov, M. Machatschek, A. Marsteller, E. L. Martin, S. Mertens, S. Mirz, B. Monreal, H. Neumann, S. Niemes, A. Osipowicz, E. Otten, D. S. Parno, A. Pollithy, A. W. P. Poon, F. Priester, P. C.-O. Ranitzsch, O. Rest, R. G. H. Robertson, C. Rodenbeck, M. Röllig, C. Röttele, M. Ryšavý, R. Sack, A. Saenz, L. Schimpf, K. Schlösser, M. Schlösser, L. Schlüter, M. Schrank, H. Seitz-Moskaliuk, V. Sibille, M. Slezák, M. Steidl, N. Steinbrink, M. Sturm, M. Suchopar, D. Tcherniakhovski, H. H. Telle, L. A. Thorne, T. Thümmler, N. Titov, I. Tkachev, N. Trost, K. Valerius, D. Vénos, R. Vianden, A. P. Vizcaya Hernández, M. Weber, C. Weinheimer, C. Weiss, S. Welte, J. Wendel, J. F. Wilkerson, J. Wolf, S. Wüstling, S. Zadoroghny, and G. Zeller
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Astrophysics ,QB460-466 ,Nuclear and particle physics. Atomic energy. Radioactivity ,QC770-798 - Abstract
Abstract The KATRIN experiment aims to measure the effective electron antineutrino mass $$m_{\overline{\nu }_e}$$ mν¯e with a sensitivity of $${0.2}\,{\hbox {eV}/\hbox {c}^2}$$ 0.2eV/c2 using a gaseous tritium source combined with the MAC-E filter technique. A low background rate is crucial to achieving the proposed sensitivity, and dedicated measurements have been performed to study possible sources of background electrons. In this work, we test the hypothesis that gamma radiation from external radioactive sources significantly increases the rate of background events created in the main spectrometer (MS) and observed in the focal-plane detector. Using detailed simulations of the gamma flux in the experimental hall, combined with a series of experimental tests that artificially increased or decreased the local gamma flux to the MS, we set an upper limit of $${0.006}\,{\hbox {count}/\hbox {s}}$$ 0.006count/s (90% C.L.) from this mechanism. Our results indicate the effectiveness of the electrostatic and magnetic shielding used to block secondary electrons emitted from the inner surface of the MS.
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- 2019
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7. For control of COVID-19: the development of regular mass testing of COVID-19 in old age psychiatry wards
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J. Baek and S. Lennon
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COVID-19 ,Mass testing ,old age psychiatry ,SARS-CoV-2 ,Psychiatry ,RC435-571 - Abstract
Introduction COVID-19, was declared a pandemic by World Health Organisation on March 11, 2020. Older people with dementia or those with multimorbidity are more vulnerable to infection with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the virus responsible for the development of COVID-19. Given absence of a vaccine or treatment, prevention is the fundamental aspect of COVID-19 control. This requires early identification of contagious people with COVID-19 and isolation keeping them apart from non infected group of people. Early identification of infection in elderly with dementia or functional psychiatric condition is often difficult, due to difficulty in obtaining history or evaluating medical symptoms. Objectives 1) To establish the current standards of interventions provided at the unit to control COVID-19, with current recommendation by Government guidance. 2) To address difficulties in early identification of people of COVID-19 in Old Age Psychiatry wards. 3) To introduce sustainable interventions aimed at controlling COVID-19 risk, targeted to this group. Methods Trust guidance for COVID-19 testing on the ward and guidance of isolation were reviewed. Literature review of currently available scientific evidence for testing for controlling COVID-19 was conducted. Results We have created a bi-weekly mass testing guidance for Old Age Psychiatry inpatient wards with clear guidane of when to start isolation and when to stop isolation. Conclusions There is no specific interventions to target older adult within our service currently and it was felt that it is necessary to develop a sustainable mass testing programme for this group of people for control of COVID-19.
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- 2021
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8. Reduction of stored-particle background by a magnetic pulse method at the KATRIN experiment
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M. Arenz, W.-J. Baek, S. Bauer, M. Beck, A. Beglarian, J. Behrens, R. Berendes, T. Bergmann, A. Berlev, U. Besserer, K. Blaum, T. Bode, B. Bornschein, L. Bornschein, T. Brunst, W. Buglak, N. Buzinsky, S. Chilingaryan, W. Q. Choi, M. Deffert, P. J. Doe, O. Dragoun, G. Drexlin, S. Dyba, F. Edzards, K. Eitel, E. Ellinger, R. Engel, S. Enomoto, M. Erhard, D. Eversheim, M. Fedkevych, J. A. Formaggio, F. M. Fränkle, G. B. Franklin, F. Friedel, A. Fulst, D. Furse, W. Gil, F. Glück, A. Gonzalez Ureña, S. Grohmann, R. Grössle, R. Gumbsheimer, M. Hackenjos, V. Hannen, F. Harms, N. Haußmann, F. Heizmann, K. Helbing, W. Herz, S. Hickford, D. Hilk, M. A. Howe, A. Huber, A. Jansen, J. Kellerer, N. Kernert, L. Kippenbrock, M. Kleesiek, M. Klein, A. Kopmann, M. Korzeczek, A. Kovalík, B. Krasch, M. Kraus, L. Kuckert, T. Lasserre, O. Lebeda, J. Letnev, A. Lokhov, M. Machatschek, A. Marsteller, E. L. Martin, S. Mertens, S. Mirz, B. Monreal, H. Neumann, S. Niemes, A. Off, A. Osipowicz, E. Otten, D. S. Parno, A. Pollithy, A. W. P. Poon, F. Priester, P. C.-O. Ranitzsch, O. Rest, R. G. H. Robertson, F. Roccati, C. Rodenbeck, M. Röllig, C. Röttele, M. Ryšavý, R. Sack, A. Saenz, L. Schimpf, K. Schlösser, M. Schlösser, K. Schönung, M. Schrank, H. Seitz-Moskaliuk, J. Sentkerestiová, V. Sibille, M. Slezák, M. Steidl, N. Steinbrink, M. Sturm, M. Suchopar, H. H. Telle, L. A. Thorne, T. Thümmler, N. Titov, I. Tkachev, N. Trost, K. Valerius, D. Vénos, R. Vianden, A. P. Vizcaya Hernández, N. Wandkowsky, M. Weber, C. Weinheimer, C. Weiss, S. Welte, J. Wendel, J. F. Wilkerson, J. Wolf, S. Wüstling, and S. Zadoroghny
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Astrophysics ,QB460-466 ,Nuclear and particle physics. Atomic energy. Radioactivity ,QC770-798 - Abstract
Abstract The KATRIN experiment aims to determine the effective electron neutrino mass with a sensitivity of $${0.2}{\hbox { eV/c}^{2}}$$ 0.2eV/c2 (%90 CL) by precision measurement of the shape of the tritium $$\upbeta $$ β -spectrum in the endpoint region. The energy analysis of the decay electrons is achieved by a MAC-E filter spectrometer. A common background source in this setup is the decay of short-lived isotopes, such as $${}^{\text {219}}\text {Rn}$$ 219Rn and $${}^{\text {220}}\text {Rn}$$ 220Rn , in the spectrometer volume. Active and passive countermeasures have been implemented and tested at the KATRIN main spectrometer. One of these is the magnetic pulse method, which employs the existing air coil system to reduce the magnetic guiding field in the spectrometer on a short timescale in order to remove low- and high-energy stored electrons. Here we describe the working principle of this method and present results from commissioning measurements at the main spectrometer. Simulations with the particle-tracking software Kassiopeia were carried out to gain a detailed understanding of the electron storage conditions and removal processes.
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- 2018
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9. Calibration of high voltages at the ppm level by the difference of $$^{83{\mathrm{m}}}$$ 83m Kr conversion electron lines at the KATRIN experiment
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M. Arenz, W.-J. Baek, M. Beck, A. Beglarian, J. Behrens, T. Bergmann, A. Berlev, U. Besserer, K. Blaum, T. Bode, B. Bornschein, L. Bornschein, T. Brunst, N. Buzinsky, S. Chilingaryan, W. Q. Choi, M. Deffert, P. J. Doe, O. Dragoun, G. Drexlin, S. Dyba, F. Edzards, K. Eitel, E. Ellinger, R. Engel, S. Enomoto, M. Erhard, D. Eversheim, M. Fedkevych, S. Fischer, J. A. Formaggio, F. M. Fränkle, G. B. Franklin, F. Friedel, A. Fulst, W. Gil, F. Glück, A. Gonzalez Ureña, S. Grohmann, R. Grössle, R. Gumbsheimer, M. Hackenjos, V. Hannen, F. Harms, N. Haußmann, F. Heizmann, K. Helbing, W. Herz, S. Hickford, D. Hilk, D. Hillesheimer, M. A. Howe, A. Huber, A. Jansen, J. Kellerer, N. Kernert, L. Kippenbrock, M. Kleesiek, M. Klein, A. Kopmann, M. Korzeczek, A. Kovalík, B. Krasch, M. Kraus, L. Kuckert, T. Lasserre, O. Lebeda, J. Letnev, A. Lokhov, M. Machatschek, A. Marsteller, E. L. Martin, S. Mertens, S. Mirz, B. Monreal, H. Neumann, S. Niemes, A. Off, A. Osipowicz, E. Otten, D. S. Parno, A. Pollithy, A. W. P. Poon, F. Priester, P. C.-O. Ranitzsch, O. Rest, R. G. H. Robertson, F. Roccati, C. Rodenbeck, M. Röllig, C. Röttele, M. Ryšavý, R. Sack, A. Saenz, L. Schimpf, K. Schlösser, M. Schlösser, K. Schönung, M. Schrank, H. Seitz-Moskaliuk, J. Sentkerestiová, V. Sibille, M. Slezák, M. Steidl, N. Steinbrink, M. Sturm, M. Suchopar, M. Suesser, H. H. Telle, L. A. Thorne, T. Thümmler, N. Titov, I. Tkachev, N. Trost, K. Valerius, D. Vénos, R. Vianden, A. P. Vizcaya Hernández, M. Weber, C. Weinheimer, C. Weiss, S. Welte, J. Wendel, J. F. Wilkerson, J. Wolf, S. Wüstling, and S. Zadoroghny
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Astrophysics ,QB460-466 ,Nuclear and particle physics. Atomic energy. Radioactivity ,QC770-798 - Abstract
Abstract The neutrino mass experiment KATRIN requires a stability of 3 ppm for the retarding potential at − 18.6 kV of the main spectrometer. To monitor the stability, two custom-made ultra-precise high-voltage dividers were developed and built in cooperation with the German national metrology institute Physikalisch-Technische Bundesanstalt (PTB). Until now, regular absolute calibration of the voltage dividers required bringing the equipment to the specialised metrology laboratory. Here we present a new method based on measuring the energy difference of two $$^{83{\mathrm{m}}}$$ 83m Kr conversion electron lines with the KATRIN setup, which was demonstrated during KATRIN’s commissioning measurements in July 2017. The measured scale factor $$M=1972.449(10)$$ M=1972.449(10) of the high-voltage divider K35 is in agreement with the last PTB calibration 4 years ago. This result demonstrates the utility of the calibration method, as well as the long-term stability of the voltage divider.
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- 2018
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10. A framework for expanding aqueous chemistry in the Community Multiscale Air Quality (CMAQ) model version 5.1
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K. M. Fahey, A. G. Carlton, H. O. T. Pye, J. Baek, W. T. Hutzell, C. O. Stanier, K. R. Baker, K. W. Appel, M. Jaoui, and J. H. Offenberg
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Geology ,QE1-996.5 - Abstract
This paper describes the development and implementation of an extendable aqueous-phase chemistry option (AQCHEM − KMT(I)) for the Community Multiscale Air Quality (CMAQ) modeling system, version 5.1. Here, the Kinetic PreProcessor (KPP), version 2.2.3, is used to generate a Rosenbrock solver (Rodas3) to integrate the stiff system of ordinary differential equations (ODEs) that describe the mass transfer, chemical kinetics, and scavenging processes of CMAQ clouds. CMAQ's standard cloud chemistry module (AQCHEM) is structurally limited to the treatment of a simple chemical mechanism. This work advances our ability to test and implement more sophisticated aqueous chemical mechanisms in CMAQ and further investigate the impacts of microphysical parameters on cloud chemistry. Box model cloud chemistry simulations were performed to choose efficient solver and tolerance settings, evaluate the implementation of the KPP solver, and assess the direct impacts of alternative solver and kinetic mass transfer on predicted concentrations for a range of scenarios. Month-long CMAQ simulations for winter and summer periods over the US reveal the changes in model predictions due to these cloud module updates within the full chemical transport model. While monthly average CMAQ predictions are not drastically altered between AQCHEM and AQCHEM − KMT, hourly concentration differences can be significant. With added in-cloud secondary organic aerosol (SOA) formation from biogenic epoxides (AQCHEM − KMTI), normalized mean error and bias statistics are slightly improved for 2-methyltetrols and 2-methylglyceric acid at the Research Triangle Park measurement site in North Carolina during the Southern Oxidant and Aerosol Study (SOAS) period. The added in-cloud chemistry leads to a monthly average increase of 11–18 % in cloud SOA at the surface in the eastern United States for June 2013.
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- 2017
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11. Hepatopulmonary Syndrome: A Frequently Overlooked Diagnosis
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T.-A. Smith, C. Tejera Quesada, J. Baek, and S. Paredes Aller
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- 2023
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12. Watch Out For Last: Local Anesthetic Systemic Toxicity
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J. Baek, T.-A. Smith, C. Tejera Quesada, J. Sixon, and C. Dorta
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- 2023
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13. Recurrent Pneumothoraces and Lung Cancer: Positive or Negative?
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C. Tejera Quesada, P. Adderley, J. Baek, T.-A. Smith, and R. Beaty
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- 2023
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14. Da Vinci SP robotic approach to colorectal surgery: two specific indications and short-term results
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G. N. Piozzi, J.-S. Kim, J. M. Choo, S. H. Shin, J. S. Kim, T.-H. Lee, S.-J. Baek, J.-M. Kwak, J. Kim, and S. H. Kim
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Gastroenterology ,Surgery - Published
- 2022
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15. Demystifying the growth of superconducting Sr2RuO4 thin films
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Hari P. Nair, Jacob P. Ruf, Nathaniel J. Schreiber, Ludi Miao, Morgan L. Grandon, David J. Baek, Berit H. Goodge, Jacob P. C. Ruff, Lena F. Kourkoutis, Kyle M. Shen, and Darrell G. Schlom
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Biotechnology ,TP248.13-248.65 ,Physics ,QC1-999 - Abstract
We report the growth of superconducting Sr2RuO4 thin films by molecular-beam epitaxy on (110) NdGaO3 substrates with transition temperatures of up to 1.8 K. We calculate and experimentally validate a thermodynamic growth window for the adsorption-controlled growth of superconducting Sr2RuO4 epitaxial thin films. The growth window for achieving superconducting Sr2RuO4 thin films is narrow in growth temperature, oxidant pressure, and ruthenium-to-strontium flux ratio.
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- 2018
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16. Fatty Acid-Induced Lipotoxicity in Pancreatic Beta-Cells During Development of Type 2 Diabetes
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Yoon S. Oh, Gong D. Bae, Dong J. Baek, Eun-Young Park, and Hee-Sook Jun
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fatty acid ,beta-cell ,lipotoxicity ,insulin secretion ,type 2 diabetes ,Diseases of the endocrine glands. Clinical endocrinology ,RC648-665 - Abstract
Type 2 diabetes is caused by chronic insulin resistance and progressive decline in beta-cell function. Optimal beta-cell function and mass is essential for glucose homeostasis and beta-cell impairment leads to the development of diabetes. Elevated levels of circulating fatty acids (FAs) and disturbances in lipid metabolism regulation are associated with obesity, and they are major factors influencing the increase in the incidence of type 2 diabetes. Chronic free FA (FFA) treatment induces insulin resistance and beta-cell dysfunction; therefore, reduction of elevated plasma FFA levels might be an important therapeutic target in obesity and type 2 diabetes. Lipid signals via receptors, and intracellular mechanisms are involved in FFA-induced apoptosis. In this paper, we discuss lipid actions in beta cells, including effects on metabolic pathways and stress responses, to help further understand the molecular mechanisms of lipotoxicity-induced type 2 diabetes.
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- 2018
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17. Synthesis science of SrRuO3 and CaRuO3 epitaxial films with high residual resistivity ratios
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Hari P. Nair, Yang Liu, Jacob P. Ruf, Nathaniel J. Schreiber, Shun-Li Shang, David J. Baek, Berit H. Goodge, Lena F. Kourkoutis, Zi-Kui Liu, Kyle M. Shen, and Darrell G. Schlom
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Biotechnology ,TP248.13-248.65 ,Physics ,QC1-999 - Abstract
Epitaxial SrRuO3 and CaRuO3 films were grown under an excess flux of elemental ruthenium in an adsorption-controlled regime by molecular-beam epitaxy (MBE), where the excess volatile RuOx (x = 2 or 3) desorbs from the growth front leaving behind a single-phase film. By growing in this regime, we were able to achieve SrRuO3 and CaRuO3 films with residual resistivity ratios (ρ300 K/ρ4 K) of 76 and 75, respectively. A combined phase stability diagram based on the thermodynamics of MBE (TOMBE) growth, termed a TOMBE diagram, is employed to provide improved guidance for the growth of complex materials by MBE.
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- 2018
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18. Effects of Bacillus-based probiotics on growth performance, nutrient digestibility, and intestinal health of weaned pigs
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Kyeong Il Park, Ki Beom Jang, Daye Mun, J. Baek, Minho Song, Myunghwan Kong, Hyunjin Kyoung, Sangdon Ryu, and Younghoon Kim
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Bacillus (shape) ,growth performance ,Nutrient digestibility ,Ecology ,biology ,Veterinary (miscellaneous) ,biology.organism_classification ,SF1-1100 ,Biochemistry, Genetics and Molecular Biology (miscellaneous) ,immune response ,Animal culture ,Immune system ,bacillus-based probiotics ,intestinal health ,Animal Science and Zoology ,Food science ,weaned pigs ,Food Science - Abstract
Bacillus is characterized by the formation of spores in harsh environments, which makes it suitable for use as a probiotic for feed because of thermostability and high survival rate, even under long-term storage. This study was conducted to investigate the effects of Bacillus-based probiotics on growth performance, nutrient digestibility, intestinal morphology, immune response, and intestinal microbiota of weaned pigs. A total of 40 weaned pigs (7.01 ± 0.86 kg body weight [BW]; 28 d old) were randomly assigned to two treatments (4 pigs/pen; 5 replicates/treatment) in a randomized complete block design (block = BW and sex). The dietary treatment was either a typical nursery diet based on corn and soybean meal (CON) or CON supplemented with 0.01% probiotics containing a mixture of Bacillus subtilis and Bacillus licheniformis (PRO). Fecal samples were collected daily by rectal palpation for the last 3 days after a 4-day adaptation. Blood, ileal digesta, and intestinal tissue samples were collected from one pig in each pen at the respective time points. The PRO group did not affect the feed efficiency, but the average daily gain was significantly improved (p < 0.05). The PRO group showed a trend of improved crude protein digestibility (p < 0.10). The serum transforming growth factor-β1 level tended to be higher (p < 0.10) in the PRO group on days 7 and 14. There was no difference in phylum level of the intestinal microbiota, but there were differences in genus composition and proportions. However, β-diversity analysis showed no statistical differences between the CON and the PRO groups. Taken together, Bacillus-based probiotics had beneficial effects on the growth performance, immune system, and intestinal microbiota of weaned pigs, suggesting that Bacillus can be utilized as a functional probiotic for weaned pigs.
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- 2021
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19. Ketamine for Adolescent Depression: An Overview and Considerations for Future Directions
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Janet J. Baek and Earth Hasassri
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General Medicine - Published
- 2022
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20. Frequency-dependent functional neuromodulatory effects on the motor network by ventral lateral thalamic deep brain stimulation in swine.
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Seungleal B. Paek, Hoon-Ki Min, Inyong Kim, Emily J. Knight, James J. Baek, Allan J. Bieber, Kendall H. Lee, and Su-Youne Chang
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- 2015
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21. Mode-II Fracture Response of PMMA Under Dynamic Loading Conditions
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Haoyan Wei, Jiun-Shyan Chen, R. Chavez Morales, J. Baek, A. Aderounmu, Veronica Eliasson, and D. Sharp
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Digital image correlation ,Materials science ,Projectile ,Materials Science (miscellaneous) ,Fracture mechanics ,Edge (geometry) ,law.invention ,Fracture toughness ,Mechanics of Materials ,Dynamic loading ,law ,Light-gas gun ,Fracture (geology) ,Composite material - Abstract
The mode-II dynamic fracture behavior of poly(methyl methacrylate) (PMMA) was experimentally and numerically studied using ultra high-speed photography combined with digital image correlation and meshfree numerical simulations. Experiments were performed by launching a projectile from a gas gun onto pre-notched rectangular PMMA specimens. Two sample geometries were used, double edge notch specimens and single edge notch specimens. Additionally, two variations of the single edge notch specimen experiments were performed, in the first experiment the projectile directly hit the sample and in the second one a buffer was placed between the sample and projectile to ensure uniform loading. Finally, the effect of the notch sharpness was explored. The impact location was below the notch to ensure mode-II loading, which would then transition into mode-I loading once the crack starts to grow. Mode-II critical stress intensity factors were extracted and it was found that notch sharpness and loading conditions can have an effect on the path the crack follows upon fracture. All of these results were compared to numerical simulations of the crack propagation processes using a meshfree method. The numerical model successfully predicted the fracture toughness and the crack-path angle within 4% and 7% of experimental values, respectively. In addition, crack-tip speeds greater than 300 m/s were observed experimentally and numerically.
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- 2021
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22. Mapping cation diffusion through lattice defects in epitaxial oxide thin films on the water-soluble buffer layer Sr3Al2O6 using atomic resolution electron microscopy
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David J. Baek, Di Lu, Yasuyuki Hikita, Harold Y. Hwang, and Lena F. Kourkoutis
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Biotechnology ,TP248.13-248.65 ,Physics ,QC1-999 - Abstract
Recent advances in the synthesis of oxide thin films have led to the discovery of novel functionalities that are not accessible in bulk structures. However, their physical properties are vulnerable to the presence of crystal defects, which can give rise to structural, chemical, and electronic modifications. These issues are central to optimizing the opportunities to create freestanding oxide films using the recently developed buffer layer Sr3Al2O6, which is soluble in room temperature water. To evaluate the general possibility to create atomic scale freestanding oxide heterostructures, it is critical to understand the formation, structure, and role of defects as this buffer layer is employed. Here, using aberration-corrected scanning transmission electron microscopy in combination with electron energy loss spectroscopy, we reveal cation segregation and diffusion along crystal defects that form during growth of an oxide multilayer structure on the Sr3Al2O6 buffer layer. We demonstrate that mass transport of film material can occur either through open dislocation core channels or site-specifically in the crystal lattice, causing local variations in stoichiometry. However, by reducing the thermal driving force for diffusion during growth, we suppress the role of extended defects as cation segregation sites, thereby retaining the inherent properties of the overlaying film.
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- 2017
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23. Fine particulate matter source apportionment using a hybrid chemical transport and receptor model approach
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Y. Hu, S. Balachandran, J. E. Pachon, J. Baek, C. Ivey, H. Holmes, M. T. Odman, J. A. Mulholland, and A. G. Russell
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Physics ,QC1-999 ,Chemistry ,QD1-999 - Abstract
A hybrid fine particulate matter (PM2.5) source apportionment approach based on a receptor model (RM) species balance and species specific source impacts from a chemical transport model (CTM) equipped with a sensitivity analysis tool is developed to provide physically and chemically consistent relationships between source emissions and receptor impacts. This hybrid approach enhances RM results by providing initial estimates of source impacts from a much larger number of sources than are typically used in RMs, and provides source–receptor relationships for secondary species. Further, the method addresses issues of source collinearities and accounts for emissions uncertainties. We apply this hybrid approach to conduct PM2.5 source apportionment at Chemical Speciation Network (CSN) sites across the US. Ambient PM2.5 concentrations at these receptor sites were apportioned to 33 separate sources. Hybrid method results led to large changes of impacts from CTM estimates for sources such as dust, woodstoves, and other biomass-burning sources, but limited changes to others. The refinements reduced the differences between CTM-simulated and observed concentrations of individual PM2.5 species by over 98% when using a weighted least-squares error minimization. The rankings of source impacts changed from the initial estimates, further demonstrating that CTM-only results should be evaluated with observations. Assessment with RM results at six US locations showed that the hybrid results differ somewhat from commonly resolved sources. The hybrid method also resolved sources that typical RM methods do not capture without extra measurement information for unique tracers. The method can be readily applied to large domains and long (such as multi-annual) time periods to provide source impact estimates for management- and health-related studies.
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- 2014
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24. 653 Increasing ascorbic acid performance – part 1 of 2: Analytical data
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E. McCraw, J. Baek, and J.A. Sass
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Cell Biology ,Dermatology ,Molecular Biology ,Biochemistry - Published
- 2023
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25. DOP81 Unaffected ileal transcriptomics in Crohn's disease is associated with the response to anti-TNF therapy
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H S Lee, Y Lee, J Baek, Y Kim, S Park, S Jung, K K Kim, S W Hwang, J L Lee, S H Park, S K Yang, B Han, K Song, Y S Yoon, and B D Ye
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Gastroenterology ,General Medicine - Abstract
Background We aimed to assess the gene expression profiles of uninflamed small bowels in patients with Crohn’s disease (CD) to identify its accompanying molecular alterations. Methods We performed RNA sequencing of the uninflamed small bowel tissues obtained from 70 patients with ileal CD, and 9 patients with colon cancer (non-CD controls) during bowel resection. Differentially expressed gene (DEG) analyses were performed using DESeq2. Gene set enrichment, correlation, and cell deconvolution analyses were applied to identify modules and functionally enriched transcriptional signatures of CD. Results A comparison of CD patients and non-CD controls revealed that of the 372 DEGs, 49 protein-coding genes and 5 lncRNAs overlapped with the IBD susceptibility loci. The pathways related to immune and inflammatory reactions were upregulated in CD, while metabolic pathways were downregulated in CD. Compared with non-CD controls, CD patients had significantly higher proportions of immune cells, including plasma cells (P=1.15×10-4), and a lower proportion of epithelial cells (P=1.12×10-4). Co-upregulated genes (M14 module) and co-downregulated genes (M9 module) were identified in CD patients. The M14 module was enriched in immune-related genes and significantly associated with the responses to anti-TNF therapy. Intestinal tissue transcriptomic analysis of 3 independent cohorts, identified M14 module upregulation in non-responders at baseline, which was predictive of response with acceptable discrimination ability (area under the curve of 77~83%). Conclusion The differences in gene expression and cellular composition between CD patients and non-CD controls imply significant molecular alterations, which are associated with the response to anti-TNF treatment.
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- 2023
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26. Concomitant Tracheal Bronchus with Tracheomalacia: Coincidence or Association?
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J. Baek, A. Rodriguez Lopez, C. Tejera Quesada, C. Wood, and A.L. Friedlander
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- 2022
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27. CKD-506, a Selective HDAC6 Inhibitor, Is a First-in-Class Drug Candidate for the Treatment of Idiopathic Pulmonary Fibrosis (IPF)
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S.-J. Lee, M.C. Kim, J. Baek, D. Suh, J.W. Song, and N. Ha
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- 2022
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28. Immunosuppression: A Hidden Component of Virchows' Triad
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C. Tejera Quesada, J. Baek, R. Reddy, A. Rodriguez, and G. Avila Amat
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- 2022
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29. Overview of the LADCO winter nitrate study: hourly ammonia, nitric acid and PM2.5 composition at an urban and rural site pair during PM2.5 episodes in the US Great Lakes region
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S. Shaw, S. Sousan, S. R. Lee, N. Riemer, T. Rohlf, J. Oleson, M. Koerber, E. Edgerton, D. Kenski, G. Carmichael, M. Caughey, J. Baek, W. Adamski, A. Singh, C. Stanier, and S. N. Spak
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Physics ,QC1-999 ,Chemistry ,QD1-999 - Abstract
An overview of the LADCO (Lake Michigan Air Directors Consortium) Winter Nitrate Study (WNS) is presented. Sampling was conducted at ground level at an urban-rural pair of sites during January–March 2009 in eastern Wisconsin, toward the western edge of the US Great Lakes region. Areas surrounding these sites experience multiday episodes of wintertime PM2.5 pollution characterized by high fractions of ammonium nitrate in PM, low wind speeds, and air mass stagnation. Hourly surface monitoring of inorganic gases and aerosols supplemented long-term 24-h aerosol chemistry monitoring at these locations. The urban site (Milwaukee, WI) experienced 13 PM2.5 episodes, defined as periods where the seven-hour moving average PM2.5 concentration exceeded 27 μg m−3 for at least four consecutive hours. The rural site experienced seven episodes by the same metric, and all rural episodes coincided with urban episodes. Episodes were characterized by low pressure systems, shallow/stable boundary layer, light winds, and increased temperature and relative humidity relative to climatological mean conditions. They often occurred in the presence of regional snow cover at temperatures near freezing, when snow melt and sublimation could generate fog and strengthen the boundary layer inversion. Substantial contribution to nitrate production from nighttime chemistry of ozone and NO2 to N2O5 and nitric acid is likely and requires further investigation. Pollutant-specific urban excess during episode and non-episode conditions is presented. The largest remaining uncertainties in the conceptual model of the wintertime episodes are the variability from episode-to-episode in ammonia emissions, the balance of daytime and nighttime nitrate production, the relationship between ammonia controls, NOx controls and ammonium nitrate reductions, and the extent to which snow and fog are causal (either through meteorological or chemical processes) rather than just correlated with episodes because of similar synoptic meteorology.
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- 2012
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30. A new approach to reduce blasting-induced vibration in tunnel blasting by utilizing the initiation time scatter of detonator
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Y Yoon, J Baek, M S Jeong, and S Jeon
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General Medicine ,General Chemistry - Abstract
The charge weight per delay is one of the major variables in empirical models for predicting the peak particle velocity in tunnel blasting. In many instances, the corresponding initiation times of the detonators often overlaps. The overlaps occur because of the initiation time scatter of each of the detonators. The overlap, in turn, causes an increased charge weight per delay, which consequently causes an increase in the blast-induced vibration. In this study, a novel technique is introduced for development of a blasting pattern exploiting the initiation time scatter of the detonators. The initiation time of 423 detonators was measured using a vibration monitoring instrument and a high-speed camera. From the data obtained, a standard deviation of the initiation times of the detonators was determined. The probability of overlap of the initiation times of the detonators was calculated using a Monte Carlo simulation. After simulating both a new blasting pattern utilizing the initiation time scatter of the detonator and the conventional blasting pattern 10,000 times each, it was determined that, in the new blasting pattern, the number of sets in which four or more blastholes initiated simultaneously decreased from 17,595 to 1604. Moreover, the probability that four or more blastholes initiated simultaneously in a blasting round decreased from approximately 70% to 12%.
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- 2023
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31. Roflumilast Treatment During Forced Abstinence Reduces Relapse to Methamphetamine Seeking and Taking
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Bryan K. Yamamoto, Carmen M. Deveau, James J Baek, and Hannah Kline
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Cyclopropanes ,Male ,Subsequent Relapse ,medicine.medical_treatment ,media_common.quotation_subject ,Amphetamine-Related Disorders ,Drug-Seeking Behavior ,Medicine (miscellaneous) ,Aminopyridines ,Self Administration ,Pharmacology ,Article ,Extinction, Psychological ,Methamphetamine ,chemistry.chemical_compound ,Recurrence ,Phosphodiesterase 4 Inhibitor ,medicine ,Animals ,Roflumilast ,media_common ,business.industry ,Meth ,Abstinence ,Rats ,Stimulant ,Psychiatry and Mental health ,chemistry ,Benzamides ,Central Nervous System Stimulants ,Phosphodiesterase 4 Inhibitors ,Self-administration ,business ,medicine.drug - Abstract
Methamphetamine (METH) is a psychostimulant with high abuse potential. Currently, there are no pharmacological treatments specific for METH abuse or stimulant use disorder generally. Although phosphodiesterase inhibitors have shown some promise, current animal models have not examined their use in abstinence from stimulant abuse. We employed a METH self-administration model in the rat followed by a forced abstinence period during which roflumilast, a phosphodiesterase 4 inhibitor, was administered. A detailed behavioral analysis of chronic treatment with roflumilast during 7 days of forced abstinence showed that roflumilast reduced METH seeking and METH taking upon subsequent relapse test. Roflumilast treatment during 7 days of forced abstinence did not affect sucrose seeking and sucrose taking behaviors. These data suggest that roflumilast may be a treatment for METH use disorder that is effective when administered only during abstinence.
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- 2021
32. Low Temperature Electron Microscopy and Manipulation of Electronic Order
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David J. Baek, Lena F. Kourkoutis, Michael J. Zachman, and Ismail El Baggari
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Materials science ,law ,Order (business) ,Electron microscope ,Instrumentation ,Molecular physics ,law.invention - Published
- 2020
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33. The perception of makeup for the elderly and the makeup behavior of new seniors
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Kyoung J. Baek
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Gerontology ,Social Psychology ,Perception ,media_common.quotation_subject ,Psychology ,Applied Psychology ,media_common - Published
- 2019
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34. 2.4 GHz wide‐bandwidth inverted‐F antenna for capsule endoscope
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Se W. Kim, Youn T. Kim, and Jong J. Baek
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Physics ,Inverted-F antenna ,Optics ,Endoscope ,business.industry ,Bandwidth (signal processing) ,Capsule ,Electrical and Electronic Engineering ,Condensed Matter Physics ,business ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials - Published
- 2019
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35. Clinical characteristics of pediatric cutaneous lupus erythematosus: experience from a tertiary referral center in Korea
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Hee Joo Kim, Joo Young Roh, Soo Kon Lee, and J Baek
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Male ,medicine.medical_specialty ,Adolescent ,Tertiary Care Centers ,030207 dermatology & venereal diseases ,03 medical and health sciences ,Lupus Erythematosus, Discoid ,Sex Factors ,0302 clinical medicine ,Rheumatology ,immune system diseases ,Republic of Korea ,Lupus Erythematosus, Cutaneous ,medicine ,Humans ,Lupus Erythematosus, Systemic ,Neonatal lupus erythematosus ,Child ,skin and connective tissue diseases ,Retrospective Studies ,Skin ,030203 arthritis & rheumatology ,business.industry ,fungi ,Infant, Newborn ,Infant ,medicine.disease ,Dermatology ,Cross-Sectional Studies ,Child, Preschool ,Cutaneous Lupus Erythematosus ,Referral center ,Female ,business ,Pediatric population - Abstract
The clinical characteristics of cutaneous lupus erythematosus (CLE) are well delineated in adults, but pediatric data, particularly in Asian populations, are limited. Therefore, we evaluated the characteristics of pediatric cases by retrospectively reviewing the medical records of children with CLE during a 15-year period in a tertiary care dermatology clinic in South Korea. The study included 21 children (8 males and 13 females), 4 of whom had neonatal lupus erythematosus (NLE). Among 17 patients with CLE, discoid lupus erythematosus (DLE) was most common (47.1%), followed by acute CLE (ACLE, 35.3%). All ACLE cases had systemic lupus erythematosus (SLE). Female predominance was conspicuous in ACLE/SLE (6/11 females versus 0/6 males), as was older age, whereas DLE and NLE showed near-equal sex distributions. The median age at the diagnosis of CLE was significantly higher in females than in males (15 years versus 4.5 years, p = 0.02). All patients with ACLE/SLE simultaneously showed skin and systemic symptoms from onset. The kidney was the most commonly involved organ. This study revealed unique characteristics of pediatric CLE, further warranting a comprehensive review among various ethnicities to understand the wide spectrum of CLE in the pediatric population.
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- 2019
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36. Salmonella Empyema Presenting as Tension Pyopneumothorax in a Diabetic Patient
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J. Baek, C. Tejera Quesada, K. Avila, Y. Rodriguez Torrado, P. Torres, and K. De Almeida
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- 2021
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37. Machine Learning Based Analysis of Heart and Cardiac Substructures for Radiation-Induced Cardiac Toxicity From Breast Cancer Radiotherapy
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Ryeong Hwang Park, H.J. Kim, J. Baek, Soo Yoon Chung, Jae Seung Chang, J.Y. Moon, Jaewon Oh, and Jin Soo Kim
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Cancer Research ,medicine.medical_specialty ,Univariate analysis ,Radiation ,business.industry ,Proportional hazards model ,Hazard ratio ,Nomogram ,medicine.disease ,Confidence interval ,medicine.anatomical_structure ,Oncology ,Ventricle ,Heart failure ,Internal medicine ,medicine ,Cardiology ,Radiology, Nuclear Medicine and imaging ,business ,Artery - Abstract
PURPOSE/OBJECTIVE(S) Radiation-induced cardiac toxicity is an importantissue of breast RT. Although a relationship between mean heart dose and acute coronary event (ACE) risk was reported in previous study, the specific relationships between doses to cardiac structures or their sub-regions and subsequent toxicity have not been well defined. In this study, we studied the effect of radiation on specific heart segments on subsequent cardiac toxicity. MATERIALS/METHODS From the 1294 patients with breast cancer where previously demonstrated a relationship between mean heart dose and ACE, 21 patients who developed HF following breast RT and 39 with ACE were identified after an independent review by cardiologists. The study included 21 and 39 controls for respective toxicity who were matched according to age, comorbidities, and physical activity. For each patient who received radiotherapy, substructures were manually drawn, and then dose-distribution parameters of heart and substructures (Mean, Maximum (Max) dose, Relative volume at least given dose from 5-50 Gy in 5 Gy increments) were collected from CT planning data. To specify most critical regions for developing ACE, analysis using High-dimensional Cox regression model (SNet) was performed to reveal the effect of radiation on specific heart segments on subsequent cardiac toxicity. RESULTS In HF (n = 42) and ACE (n = 78) cohorts, characteristics between case and control were well matched. Mean time to develop heart failure, acute coronary events were 40.0 months and 42.2 months, respectively. In HF cohort, there was no significant difference not only in the mean heart dose (3.7 Gy vs 3.1 Gy, P = 0.652), but also in the mean left ventricle (LV) (5.0 Gy vs 4.1 Gy, P = 0.587), mean right ventricle (RV) (4.8 Gy vs 3.6 Gy, P = 0.473). On the other hand, in ACE cohort, there was significant difference in mean dose of heart (2.9 Gy vs 1.3 Gy, P = 0.015), left atrium (LA) (1.0 Gy vs 0.5 Gy, P = 0.008), LV (3.7 Gy vs 1.5 Gy, P = 0.028), left anterior descending artery (LAD) (6.6 Gy vs 2.4 Gy, P = 0.028) and right atrium (RA) (1.5 Gy vs 0.9 Gy, P = 0.025). In univariate analysis, mean dose of heart, LA, LV, LAD and RA was significant factors for acute coronary event free survival. ((Heart; P = 0.006, Hazard ratio (HR) 1.139, 95% Confidence Interval (CI) 1.035-1.253) (LA; P = 0.002, HR 1.735, 95% CI 1.209-2.490), (LV; P = 0.018, HR 1.079, 95% CI 1.012-1.150), (LAD; P = 0.031, HR 1.032, 95% CI 1.002-1.064), (RA; P = 0.008, HR = 1.307, 95% CI 1.068-1.598)). For predicting ACE risk for breast cancer patients, SNet model suggested nomogram based on mean and max LA dose, LAD V10, 15, 20, mean heart dose, mean RA dose and RV V35 in the order of higher predicted point variation. Based on this risk stratification model, event free survival significantly showed difference (P = 0.013). CONCLUSION There was significant difference between cardiac substructure dose parameters in ACE cohort, but not in HF cohort. Further analysis using convolution neural network will be performed to specify most critical region to be spared.
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- 2021
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38. OP0062 EFFICACY AND SAFETY OF ADALIMUMAB WITH LOW AND HIGH DOSE-METHOTREXATE IN PATIENTS WITH RHEUMATOID ARTHRITIS WITH INADEQUATE RESPONSE TO METHOTREXATE: THE RANDOMISED CONTROLLED MIRACLE STUDY
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H. Tamai, K. Ikeda, T. Miyamoto, H. Taguchi, C. F. Kuo, K. Shin, S. Hirata, Y. Okano, S. Sato, H. Yasuoka, I. A. Choi, S. H. Park, M. Y. Weng, M. Kuwana, Y. J. Lee, T. Ishii, J. Kim, H. Kameda, T. Kojima, H. J. Baek, P. N. Hsu, C. M. Huang, T. T. Cheng, W. Y. Sung, T. Taninaga, M. Mori, H. Miyagishi, Y. Sato, T. Takeuchi, and Y. Kaneko
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Rheumatology ,Immunology ,Immunology and Allergy ,General Biochemistry, Genetics and Molecular Biology - Abstract
BackgroundRheumatoid arthritis (RA) is a chronic inflammatory autoimmune disease that causes not only joint pain but also bone destruction resulting in impairment of quality of life. Tumor necrosis factor inhibitors have improved prognosis of patients with rheumatoid arthritis dramatically, especially in combination with methotrexate, however, the optimal dose of the concomitant methotrexate is unclear.ObjectivesTo evaluate the efficacy and safety of adalimumab in combination with reduced dose of methotrexate in patients with early RA with inadequate response to methotrexate.MethodsThe MIRACLE study was a multinational, randomized, open-label study in patients with RA with inadequate response to methotrexate conducted in Asia. It compared low dose and high dose methotrexate upon starting adalimumab. Methotrexate-naive patients with RA with a disease duration of less than two years started methotrexate at 6 to 8 mg/week and increased it to the maximum tolerable dose by week 12. Patients who have not achieved remission according to simplified disease activity index (SDAI) despite methotrexate ≥ 10 mg/week at week 24 were randomised to the maximum tolerable dose of methotrexate group (10 to 25 mg/week) or the reduced dose group (6 to 8 mg/week) and started to receive subcutaneous adalimumab 40 mg every other week. The primary endpoint was non-inferiority in the achievement of SDAI remission at week 48 in the reduced dose group compared with the maximum tolerable dose group with a non-inferiority margin of -15% based on two-sided 90% confidence interval. (NCT03505008)ResultsA total of 300 patients were enrolled in the study. Among them, 291 started methotrexate and were included in the analysis. The mean age was 57.7±15.2 years, female was 74.6%, and the mean disease duration from the diagnosis of RA was 21.1±56.2 days. Anti-CCP antibody was positive in 211 (73.0%) and the mean SDAI at study enrollment was 26.5±12.4. At week 24, with the mean dose of methotrexate of 12.6±2.9 mg/week, 108 patients (37.1%) achieved remission according to SDAI and continued MTX monotherapy. 134 patients (46.0%) were randomised and started adalimumab with 68 patients in the maximum tolerable dose group and 66 patients in the reduced dose group. At week 48, the remission achievement rates were 38.4 % and 44.8 %, respectively, with the adjusted risk difference of the reduced dose group to the maximum tolerable dose group of 6.4% (-7.0% to 19.8%, 90% CI), which met the criterion for noninferiority. No significant difference was found in health assessment questionnaire disability index ≤0.5 (59.1% vs 62.0%, respectively, p=0.72) and in radiological remission rates (Δmodified total Sharp score ≤0.5, 66.3% vs 62.0 %, respectively, p=0.59). Adverse drug reactions tended to be more frequent in the maximum tolerable dose group than in the reduced dose group (22.1% vs 9.1%, respectively, p=0.06).ConclusionThe MIRACLE randomised study demonstrated that, in patients with inadequate response to methotrexate, the efficacy of adalimumab with reduced dose of concomitant methotrexate was not inferior to that with maximum tolerable dose of methotrexate with better safety profile.Disclosure of InterestsHiroya Tamai Speakers bureau: Eisai, Grant/research support from: Eisai, Kei Ikeda Speakers bureau: AbbVie, Eisai, Eli Lilly, Novartis, Gilead, Asahi-Kasei, Grant/research support from: Mitsubishi-Tanabe, Toshiaki Miyamoto: None declared, Hiroaki Taguchi: None declared, Chang-Fu Kuo: None declared, Kichul Shin: None declared, Shintaro Hirata Speakers bureau: AbbVie, Asahi-Kasei, Astellas, Ayumi, Bristol Myers Squibb, Celgene, Chugai, Eisai, Eli Lilly, Gilead, Glaxo SmithKline, Janssen, Kyorin, Novartis, Pfizer, Sanofi, Tanabe-Mitsubishi, UCB, Paid instructor for: AbbVie, Mitsubishi-Tanabe, Consultant of: AbbVie, Astellas, Bristol Myers Squibb, Eisai, Gilead, Ily Lilly, Grant/research support from: AbbVie, Asahi-Kasei, Eisai, Otsuka, Sanofi, Shionogi, Chugai, Pfizer, Tanabe-Mitsubishi, Eli Lilly, UCB, yutaka okano: None declared, Shinji Sato Speakers bureau: AbbVie, Eisai, Grant/research support from: AbbVie, Eisai, Hidekata Yasuoka Speakers bureau: AbbVie, Asahi Kasei Pharma, Astellas, Daiichi-Sankyo, Eisai, Kissei, Takeda, Mitsubishi-Tanabe, Chugai, Novartis, Eli Lilly, Pfizer, Janssen, Sanofi, Teijin, Boehringer-Ingelheim, Bayer, Glaxo Smith Kline, Paid instructor for: AbbVie, Consultant of: AbbVie, Asahi Kasei, Grant/research support from: Mitsubishi-Tanabe, Takeda, Daiichi-Sankyo, Chugai, Bristol-Myers, MSD, Astellas, In Ah Choi Speakers bureau: Abbvie, Eisai, Sung-Hwan Park: None declared, Meng-Yu Weng Paid instructor for: Novartis, Eli Lilly, ChuGai, Abbvie, Consultant of: Abbvie, Masataka Kuwana Speakers bureau: Astellas, Asahi Kasei Pharma, Boehringer-Ingelheim, Chugai, Eisai, Janssen, Mochida, Nippon Shinyaku, Ono Pharmaceuticals, Pfizer, Mitsubishi-Tanabe, Consultant of: Boehringer-Ingelheim, Kissei, Mochida, Grant/research support from: AbbVie, Asahi Kasei Pharma, Boehringer-Ingelheim, Chugai, Eisai, MBL, Nippon Shinyaku, Ono Pharmaceuticals, Mitsubishi-Tanabe, Yun Jong Lee Grant/research support from: Yuhan, Tomonori Ishii Speakers bureau: Chugai, Mitsubishi-Tanabe, Glaxo Smith Kline, Pfizer, Eli Lilly, Janssen, AbbVie, Eisai, Astellas, Jinhyun Kim: None declared, Hideto Kameda Speakers bureau: AbbVie, Pfizer, Consultant of: AbbVie, Grant/research support from: AbbVie, Eisai, Toshihisa Kojima Speakers bureau: AbbVie, Pfizer, Eisai, Grant/research support from: AbbVie, Han Joo Baek: None declared, Ping-Ning Hsu: None declared, Chun-Ming Huang Paid instructor for: Abbvie, Pfizer, Tien-Tsai Cheng Paid instructor for: Abbvie, Grant/research support from: Abbvie, Wan-Yu Sung: None declared, Takehiro Taninaga Shareholder of: Eisai.co.,Ltd., Employee of: Eisai.co.,Ltd., Masahiko Mori Shareholder of: Eisai.co.,Ltd., Employee of: Eisai.co.,Ltd., Hideaki Miyagishi Shareholder of: Eisai.co.,Ltd., Employee of: Eisai.co.,Ltd., Yasunori Sato Speakers bureau: Eisai Co., Ltd. Kowa Company, Ltd., Consultant of: MOCHIDA PHARMACEUTICAL CO., LTD, Tsutomu Takeuchi Speakers bureau: Astellas, AbbVie, Ayumi, Bristol Myers Squibb, Chugai, Daiichi-Sankyo, Eisai, Eli Lilly, Gilead, Glaxo Smith Kline, Janssen, Mitsubishi-Tanabe, Nippon-kayaku, Novartis, Pfizer, Sanofi, UCB, Grant/research support from: Asahi Kasei, AbbVie, Ayumi, Boehringer-Ingelheim, Chugai, Eisai, Eli Lilly, Mitsubishi-Tanabe, Sanofi, UCB, Yuko Kaneko Speakers bureau: Asahi Kasei, Astellas, Ayumi, Bristol Myers Squibb, Chugai, Eisai, Elli Lilly, Mitsubishi-Tanabe, Novartis, UCB, Grant/research support from: AbbVie, Chugai, Eisai, Mitsubishi-Tanabe, UCB.
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- 2022
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39. NAG-1/GDF15 Transgenic Mouse Has Less White Adipose Tissue and a Reduced Inflammatory Response
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J. M. Kim, J. P. Kosak, J. K. Kim, G. Kissling, D. R. Germolec, D. C. Zeldin, J. A. Bradbury, S. J. Baek, and T. E. Eling
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Pathology ,RB1-214 - Abstract
NAG-1/GDF15 is a TGF-β superfamily member with poorly characterized biological activity proposed to inhibit inflammatory cytokine production. Transgenic mice expressing human NAG-1/GDF15 (NAG-1Tg/Lox) are leaner with lower body weight and are resistant to chemically or genetically induced intestinal tumors. Because of the link between obesity, inflammation, and cancer, we examined whether these mice exhibit a reduced response to inflammatory stimuli. The NAG-1Tg/Lox mice had a reduced inflammatory response to LPS based on the serum levels of cytokines KC, IL-6, MCP-1, and TNFα. In contrast to literature reports and our in vivo results, NAG-1 did not inhibit LPS-induced cytokine expression in vitro in RAW264.7 cells, mouse peritoneal macrophages, or mouse liver Kupffer cells, suggesting that NAG-1/GDF15 does not directly inhibit LPS-induced inflammatory cytokine production. However, NAG-1Tg/Lox mice have less white adipose tissue, the major source of inflammatory adipokines including leptin. Basal and LPS-treated serum leptin and mRNA levels in the adipose tissue of NAG-1Tg/Lox mice were lower than those in WT mice. We propose that the reduced white adipose tissue and reduced leptin expression may be responsible, in part, for the reduced inflammatory response to LPS and the decrease in intestinal tumors observed in NAG-1Tg/Lox mice.
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- 2013
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40. Hepatobiliary and Pancreatic: Liver abscess not responding to drainage and antibiotics
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J-S Yeom, Young Nyun Park, Se Hoon Kim, Y J Baek, Hye Won Lee, B H Yoo, and Ji Yeong An
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Liver surgery ,Adult ,medicine.medical_specialty ,Fever ,Paragonimiasis ,medicine.drug_class ,Liver Diseases, Parasitic ,Antibiotics ,Liver Abscess ,Paragonimus ,Treatment failure ,X ray computed ,medicine ,Animals ,Hepatectomy ,Humans ,Treatment Failure ,Drainage ,Hepatology ,business.industry ,Gastroenterology ,medicine.disease ,Abdominal Pain ,Anti-Bacterial Agents ,Eosinophils ,Liver ,Female ,Radiology ,business ,Tomography, X-Ray Computed ,Liver pathology ,Liver abscess - Published
- 2020
41. Charge order textures induced by non-linear couplings in a half-doped manganite
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Ismail El Baggari, Harold Y. Hwang, Yasuyuki Hikita, Michael J. Zachman, Lena F. Kourkoutis, Elizabeth A. Nowadnick, Di Lu, and David J. Baek
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0301 basic medicine ,Physics ,Multidisciplinary ,Electronic properties and materials ,Condensed matter physics ,Quantum fluids and solids ,Science ,Superlattice ,Point reflection ,General Physics and Astronomy ,Charge (physics) ,02 engineering and technology ,General Chemistry ,Electron ,021001 nanoscience & nanotechnology ,Bond order ,Atomic units ,General Biochemistry, Genetics and Molecular Biology ,Article ,03 medical and health sciences ,030104 developmental biology ,Lattice (order) ,0210 nano-technology ,Quantum - Abstract
The self-organization of strongly interacting electrons into superlattice structures underlies the properties of many quantum materials. How these electrons arrange within the superlattice dictates what symmetries are broken and what ground states are stabilized. Here we show that cryogenic scanning transmission electron microscopy (cryo-STEM) enables direct mapping of local symmetries and order at the intra-unit-cell level in the model charge-ordered system Nd1/2Sr1/2MnO3. In addition to imaging the prototypical site-centered charge order, we discover the nanoscale coexistence of an exotic intermediate state which mixes site and bond order and breaks inversion symmetry. We further show that nonlinear coupling of distinct lattice modes controls the selection between competing ground states. The results demonstrate the importance of lattice coupling for understanding and manipulating the character of electronic self-organization and that cryo-STEM can reveal local order in strongly correlated systems at the atomic scale., In this paper, the authors demonstrate that cryogenic scanning transmission electron microscopy allows for the direct mapping of the local arrangements and symmetries of electronic order, providing a useful method for studying strongly correlated systems. They show this using the example of Nd1/2Sr1/2MnO3, a model charge ordered material.
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- 2020
42. Image registration of low signal-to-noise cryo-STEM data
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Jason Hoffman, Tyrel M. McQueen, Lena F. Kourkoutis, Emily Waite, Ismail El Baggari, Berit H. Goodge, Alemayehu S. Admasu, John P. Sheckelton, Colin B. Clement, Christopher Pasco, Sang-Wook Cheong, David J. Baek, Anand Bhattacharya, Nathaniel J. Schreiber, Jaewook Kim, Darrell G. Schlom, Benjamin H. Savitzky, Robert Hovden, and Hari P. Nair
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010302 applied physics ,Computer science ,business.industry ,Picometre ,Image registration ,Image processing ,02 engineering and technology ,Iterative reconstruction ,Cryogenics ,021001 nanoscience & nanotechnology ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Signal-to-noise ratio ,Stack (abstract data type) ,Computer Science::Computer Vision and Pattern Recognition ,0103 physical sciences ,Microscopy ,Computer vision ,Artificial intelligence ,0210 nano-technology ,business ,Instrumentation - Abstract
Combining multiple fast image acquisitions to mitigate scan noise and drift artifacts has proven essential for picometer precision, quantitative analysis of atomic resolution scanning transmission electron microscopy (STEM) data. For very low signal-to-noise ratio (SNR) image stacks – frequently required for undistorted imaging at liquid nitrogen temperatures – image registration is particularly delicate, and standard approaches may either fail, or produce subtly specious reconstructed lattice images. We present an approach which effectively registers and averages image stacks which are challenging due to their low-SNR and propensity for unit cell misalignments. Registering all possible image pairs in a multi-image stack leads to significant information surplus. In combination with a simple physical picture of stage drift, this enables identification of incorrect image registrations, and determination of the optimal image shifts from the complete set of relative shifts. We demonstrate the effectiveness of our approach on experimental, cryogenic STEM datasets, highlighting subtle artifacts endemic to low-SNR lattice images and how they can be avoided. High-SNR average images with information transfer out to 0.72 A are achieved at 300 kV and with the sample cooled to near liquid nitrogen temperature.
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- 2018
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43. Autonomous bioluminescent expression of the bacterial luciferase gene cassette (lux) in a mammalian cell line.
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Dan M Close, Stacey S Patterson, Steven Ripp, Seung J Baek, John Sanseverino, and Gary S Sayler
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Medicine ,Science - Abstract
The bacterial luciferase (lux) gene cassette consists of five genes (luxCDABE) whose protein products synergistically generate bioluminescent light signals exclusive of supplementary substrate additions or exogenous manipulations. Historically expressible only in prokaryotes, the lux operon was re-synthesized through a process of multi-bicistronic, codon-optimization to demonstrate for the first time self-directed bioluminescence emission in a mammalian HEK293 cell line in vitro and in vivo.Autonomous in vitro light production was shown to be 12-fold greater than the observable background associated with untransfected control cells. The availability of reduced riboflavin phosphate (FMNH(2)) was identified as the limiting bioluminescence substrate in the mammalian cell environment even after the addition of a constitutively expressed flavin reductase gene (frp) from Vibrio harveyi. FMNH(2) supplementation led to a 151-fold increase in bioluminescence in cells expressing mammalian codon-optimized luxCDE and frp genes. When injected subcutaneously into nude mice, in vivo optical imaging permitted near instantaneous light detection that persisted independently for the 60 min length of the assay with negligible background.The speed, longevity, and self-sufficiency of lux expression in the mammalian cellular environment provides a viable and powerful alternative for real-time target visualization not currently offered by existing bioluminescent and fluorescent imaging technologies.
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- 2010
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44. AB0253 COMPARISON OF PHARMACODYNAMICS OF METHOTREXATE AS METHOTREXATE-POLYGLUTAMATES CONCENTRATIONS IN RHEUMATOID ARTHRITIS; INTERIM DATA EVALUATION OF MIRACLE STUDY CONDUCTED IN JAPAN, KOREA AND TAIWAN
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Hideto Kameda, H. J. Baek, Shinji Sato, P. N. Hsu, Masataka Kuwana, Kei Ikeda, Yutaka Okano, Hidekata Yasuoka, Masaaki Mori, Shintaro Hirata, Tohru Takeuchi, Y. J. Lee, K. Shin, W. Y. Sung, Tomonori Ishii, T. T. Cheng, T. Miyamoto, I. A. Choi, Y. Sato, H. Tamai, J. Kim, M. Y. Weng, Y. Kaneko, T. Taninaga, C. M. Huang, W. C. Tsai, S. H. Park, H. Miyagishi, C. F. Kuo, Toshihisa Kojima, and H. Taguchi
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medicine.medical_specialty ,business.industry ,Immunology ,medicine.disease ,General Biochemistry, Genetics and Molecular Biology ,Rheumatology ,Internal medicine ,Interim ,Rheumatoid arthritis ,Pharmacodynamics ,medicine ,Immunology and Allergy ,Methotrexate ,business ,medicine.drug - Abstract
Background:Methotrexate (MTX) is the first-line therapy for rheumatoid arthritis (RA). The concentrations of MTX-polyglutamates (PG) in erythrocytes, an active form of MTX, are useful markers for the optimal usage of MTX in patients with RA. The concentrations of MTX-PG have been reported to be different between Japanese and Caucasians. However, the difference among Asian ethnicity remains unclear.Objectives:To examine MTX-PG concentrations in association with MTX dose during the first 24 weeks after the initiation of MTX for newly diagnosed RA patients in Japan, Korea and Taiwan.Methods:MIRACLE study is a multicenter, open-label, randomized, 48 weeks interventional study conducted in Japan, Korea and Taiwan to evaluate non-inferiority of low dose to high dose of MTX as an add-on therapy to adalimumab in 300 patients with RA who do not achieve remission after 24 weeks MTX monotherapy in stipulated dosage. In the first 24 weeks, MTX was started at 6 to 8 mg/week for newly diagnosed RA patients, and promptly escalated to the maximum tolerable dose in 12 weeks in principle. This interim data evaluation was intended to investigate the differences among countries in the relationship between MTX dose, safety and MTX-PG concentrations in erythrocytes during the first 24 weeks. The efficacy of the treatment is not included at this point.Results:A total of 166 patients (106 in Japan, 35 in Korea, 25 in Taiwan) were included in this interim data. The age at treatment initiation was 57.2 years old on average and female was 79.5%. The time course changes in total and individual MTX-PG levels differed in the three countries. At 24 weeks, whereas the mean total MTX-PG concentrations were comparable (112.9 nmol/L in Japan, 104.4 nmol/L in Korea, and 115.7 nmol/L in Taiwan) with a dose of MTX of 12.3 mg/week, 14.1 mg/week, and 12.2 mg/week, respectively, the individual MTX-PG concentrations were different. The MTX-PG1 and MTX-PG2 concentrations were lower in Korea than Japan and Taiwan whereas MTX-PG3, MTX-PG4 and MTX-PG5 concentrations were the highest in Korea.Conclusion:The distribution of short-chain and long-chain MTX-PG concentrations were various among Asian countries despite similar dose of MTX administration: NCT03505008.Disclosure of Interests:Hiroya Tamai: None declared, Yuko Kaneko Speakers bureau: AbbVie, Astellas, Ayumi, Bristol–Myers Squibb, Chugai, Eisai, Eli Lilly, Hisamitsu, Jansen, Kissei, Kirin, Pfizer, Sanofi, Takeda, Tanabe-Mitsubishi, and UCB., Grant/research support from: Sanofi, Hideto Kameda Speakers bureau: AbbVie, Pfizer, Consultant of: AbbVie, Grant/research support from: AbbVie, Eisai, Masataka Kuwana Speakers bureau: Astellas, Asahi Kasei Pharma, Boehringer- Ingelheim, Chugai, Eisai, Janssen, Mochida, Nippon Shinyaku, Ono Pharmaceuticals, Pfizer, Mitsubishi-Tanabe, Consultant of: Corbus, Grant/research support from: AbbVie, Asahi Kasei Pharma, Boehringer- Ingelheim, Chugai, Eisai, MBL, Nippon Shinyaku, Ono Pharmaceuticals, Mitsubishi-Tanabe, Yutaka Okano: None declared, Tomonori Ishii Speakers bureau: Chugai, Mitsubishi- Tanabe, Glaxo Smith Kline, Pfizer, Eli Lilly, Janssen, AbbVie, Eisai, Astellas, Kei Ikeda Speakers bureau: AbbVie, Eli Lilly, Novartis, Mitsubishi-Tanabe, Eisai, BMS, Grant/research support from: Mitsubishi-Tanabe, Hiroaki Taguchi: None declared, Shinji Sato: None declared, Toshiaki Miyamoto: None declared, Shintaro Hirata Speakers bureau: AbbVie, Asahi Kasei Pharma, Astellas, Ayumi, Bristol Myers Squibb, Chugai, Eisai, Eli Lilly, Janssen, Glaxo Smith Kline, Kissei, Pfizer, Sanofi, Mitsubishi- Tanabe, UCB, Paid instructor for: AbbVie, Mitsubishi- Tanabe, Consultant of: AbbVie, Eisai, Gilead, Grant/research support from: AbbVie, Chugai, Mitsubishi-Tanabe, UCB, Hidekata Yasuoka Speakers bureau: AbbVie, Asahi Kasei Pharma, Astellas, Daiichi- Sankyo, Eisai, Kissei, Takeda, Mitsubishi- Tanabe, Chugai, Novartis, Eli Lilly, Pfizer, Janssen, Sanofi, Teijin, Boehringer- Ingelheim, Bayer, Glaxo Smith Kline, Paid instructor for: AbbVie, Consultant of: AbbVie, Asahi Kasei, Grant/research support from: Mitsubishi-Tanabe, Takeda, Daiichi-Sankyo, Chugai, Bristol-Myers, MSD, Astellas, Toshihisa Kojima Speakers bureau: AbbVie, Pfizer, Eisai, Grant/research support from: AbbVie, Sung-Hwan Park: None declared, Kichul Shin: None declared, Han Joo Baek: None declared, Yun Jong Lee Grant/research support from: research fund, In Ah Choi Speakers bureau: Abbvie, Eizai, Grant/research support from: Abbvie, Eizai, Jinhyun Kim: None declared, Ping-Ning Hsu: None declared, Chang-Fu Kuo: None declared, Chun-Ming Huang Paid instructor for: AbbVie, Pfizer, Meng-Yu Weng Consultant of: AbbVie, Wan-Yu Sung: None declared, Wen-Chan Tsai: None declared, Tien-Tsai Cheng Paid instructor for: AbbVie, Grant/research support from: AbbVie, Takehiro Taninaga Shareholder of: Eisai Co., Ltd., Employee of: Eisai Co., Ltd., Masahiko Mori Shareholder of: Eisai Co., Ltd., Employee of: Eisai Co., Ltd., Hideaki Miyagishi Employee of: Eisai Co., Ltd., Yasunori Sato: None declared, Tsutomu Takeuchi Speakers bureau: Astellas, Abbvie, Daiichi Sankyo, Ayumi, Eisai, GlaxoSmithKline, Mitsubishi Tanabe, Chugai, Novartis, Eli Lilly, Pfizer, Bristol Myers Squibb, Janssen, UCB, TaishoToyama, Sanofi–Aventis, Nipponkayaku, Taiho, Gilead, Boehringer Ingelheim, Grant/research support from: Asahikasei, Astellas, Abbvie, Daiichi Sankyo, Ayumi, Eisai, Takeda, Mitsubishi Tanabe, Chugai, Eli Lilly, UCB, Sanofi–Aventis, Nipponkayaku, Boehringer Ingelheim
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- 2021
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45. Supporting development of cell and gene therapies by addressing mrna purification challenges
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J. Potter, J. Baek, K. Flook, J. de Rooij, Dazhi Yang, A. De Leon, and T. Vonderfecht
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Cancer Research ,Transplantation ,Messenger RNA ,Immunology ,Cell ,Cell Biology ,Biology ,Cell biology ,medicine.anatomical_structure ,Oncology ,medicine ,Immunology and Allergy ,Gene ,Genetics (clinical) - Published
- 2021
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46. Real-time, multidirectional 2D fast wavelet transform and its denoised sharpening application.
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B. J. Baek and T. C. Kim
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- 2012
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47. SEE ONE, DO ONE, TEACH ONE: YOGA FOR SCHOOLS, INDIVIDUALS, AND GROUP PRACTICE
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Janet J. Baek, Kirti Saxena, Bettina Bernstein, and Aleema Zakers
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Psychiatry and Mental health ,Medical education ,Group (mathematics) ,Developmental and Educational Psychology ,Psychology - Published
- 2021
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48. 32.1 THE BENEFITS OF YOGA FOR CHILDREN AND ADOLESCENTS: EMERGING FINDINGS
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Janet J. Baek
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Psychiatry and Mental health ,Developmental and Educational Psychology - Published
- 2020
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49. Emergent carotid artery stenting in patients with acute ischemic stroke due to cervical internal carotid artery steno-occlusive lesion: Comparison of tandem intracranial occlusion and isolated cervical internal carotid artery occlusion
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Sangmin Lee, Sung Eun Park, Dae S Choi, Ji Young Ha, Jungho Won, Seunguk Jung, Kyeong Hwa Ryu, Hye J. Baek, and Ho C Choi
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Male ,medicine.medical_specialty ,Carotid arteries ,Carotid Artery Stenting ,Lesion ,medicine.artery ,Internal medicine ,Occlusion ,medicine ,Humans ,In patient ,Carotid Stenosis ,Thrombolytic Therapy ,cardiovascular diseases ,Stroke ,Aged ,Ischemic Stroke ,Retrospective Studies ,Thrombectomy ,Aged, 80 and over ,business.industry ,Middle Aged ,medicine.disease ,Magnetic Resonance Imaging ,Cerebral Angiography ,Arterial Occlusive Diseases ,Cardiology ,Female ,Stents ,Internal carotid artery occlusion ,Internal carotid artery ,medicine.symptom ,business ,Tomography, X-Ray Computed ,Carotid Artery, Internal - Abstract
Purpose Acute ischemic strokes caused by steno-occlusive lesion of the cervical internal carotid artery are associated with poor clinical outcome. We evaluated the clinical efficacy of emergent carotid artery stenting for the management of these lesions. We compared the clinical outcomes regarding the intracranial lesion, namely tandem occlusions versus isolated cervical internal carotid artery occlusion. Materials and methods We retrospectively reviewed patients with acute ischemic stroke who underwent carotid artery stenting for cervical internal carotid artery steno-occlusive lesion between 2011 and 2018. After dividing the patients into two groups according to the presence or absence of intracranial lesions (tandem group and isolated cervical group), we analyzed demographic data, angiographic findings, and clinical outcomes. A modified Rankin Scale score ≤2 was defined as a favorable clinical outcome. Results Of 75 patients, 46 patients (61.3%) had tandem lesions, and the remaining 29 had only cervical internal carotid artery steno-occlusive lesion. Successful stenting was performed in all patients with favorable clinical outcomes (64.0%). Successful reperfusion score (thrombolysis in cerebral infarction ≥2 b) was 84.0%; tandem group (76.1%) versus isolated cervical group (96.6%) of cases. Mean modified Rankin Scale score at 90-days was 2.09. The rate of favorable clinical outcome showed no statistically significant difference between the two groups ( p = 0.454). Conclusions Endovascular treatment in patients with acute ischemic stroke due to cervical internal carotid artery steno-occlusive lesion is a technically feasible and clinically effective intervention regardless of intracranial occlusion. Therefore, we recommend endovascular treatment regardless of the presence of concomitant intracranial artery occlusion for patients with acute ischemic stroke caused by cervical internal carotid artery steno-occlusive lesion.
- Published
- 2020
50. Charge order textures induced by non-linear lattice coupling in a half-doped manganite
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David J. Baek, Elizabeth Nowadnick, Michael J. Zachman, Di Lu, Lena F. Kourkoutis, Harold Y. Hwang, Yasuyuki Hikita, and Ismail El Baggari
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Physics ,Condensed matter physics ,Strongly Correlated Electrons (cond-mat.str-el) ,Superlattice ,Point reflection ,FOS: Physical sciences ,02 engineering and technology ,Electron ,021001 nanoscience & nanotechnology ,Manganite ,01 natural sciences ,Bond order ,Condensed Matter - Strongly Correlated Electrons ,Lattice (order) ,0103 physical sciences ,Scanning transmission electron microscopy ,010306 general physics ,0210 nano-technology ,Quantum - Abstract
The self-organization of strongly interacting electrons into superlattice structures underlies the properties of many quantum materials. How these electrons arrange within the superlattice dictates what symmetries are broken and what ground states are stabilized. Here we show that cryogenic scanning transmission electron microscopy enables direct mapping of local symmetries and order at the intra-unit-cell level in the model charge-ordered system Nd1/2Sr1/2MnO3. In addition to imaging the prototypical site-centered charge order, we discover the nanoscale coexistence of an exotic intermediate state which mixes site and bond order and breaks inversion symmetry. We further show that nonlinear coupling of distinct lattice modes controls the selection between competing ground states. The results demonstrate the importance of lattice coupling for understanding and manipulating the character of electronic self-organization and highlight a novel method for probing local order in a broad range of strongly correlated systems.
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- 2020
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