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Hall S, Ewald G, Berman P, Sulemanjee N, Kao A, Wolf-Doty T, Sninsky J, Yee J, Kobashigawa J. Gene Expression Profiling for Cardiac Transplant Recipients: Results from the Outcomes AlloMap® Registry. J Heart Lung Transplant 2018. [DOI: 10.1016/j.healun.2018.01.848] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Beauchamp S, Carl K, Kennedy K, Austin B, Everley M, Khumri T, Lawhorn S, Magalski A, Sperry B, Vodnala D, Borkon A, Dryton G, Kao A. Variability of Both Raw and Transformed Gene Expression Profile Scores Predict Adverse Events Post Heart Transplant: The Mid America Experience. J Heart Lung Transplant 2018. [DOI: 10.1016/j.healun.2018.01.110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Kao A, Gao J, Pericleous K. Thermoelectric magnetohydrodynamic effects on the crystal growth rate of undercooled Ni dendrites. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2018; 376:rsta.2017.0206. [PMID: 29311205 PMCID: PMC5784097 DOI: 10.1098/rsta.2017.0206] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 09/12/2017] [Indexed: 05/25/2023]
Abstract
In the undercooled solidification of pure metals, the dendrite tip velocity has been shown experimentally to have a strong dependence on the intensity of an external magnetic field, exhibiting several maxima and minima. In the experiments conducted in China, the undercooled solidification dynamics of pure Ni was studied using the glass fluxing method. Visual recordings of the progress of solidification are compared at different static fields up to 6 T. The introduction of microscopic convective transport through thermoelectric magnetohydrodynamics is a promising explanation for the observed changes of tip velocities. To address this problem, a purpose-built numerical code was used to solve the coupled equations representing the magnetohydrodynamic, thermal and solidification mechanisms. The underlying phenomena can be attributed to two competing flow fields, which were generated by orthogonal components of the magnetic field, parallel and transverse to the direction of growth. Their effects are either intensified or damped out with increasing magnetic field intensity, leading to the observed behaviour of the tip velocity. The results obtained reflect well the experimental findings.This article is part of the theme issue 'From atomistic interfaces to dendritic patterns'.
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Shung-Shung S, Yu-Chien S, Mei-Due Y, Hwei-Chung W, Kao A. Improving diagnosis of acute appendicitis with atypical findings by Tc-99m HMPAO leukocyte scan. Nuklearmedizin 2018. [DOI: 10.1055/s-0038-1623994] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
Summary
Aim: Even with careful observation, the overall false-positive rate of laparotomy remains 10-15% when acute appendicitis was suspected. Therefore, the clinical efficacy of Tc-99m HMPAO labeled leukocyte (TC-WBC) scan for the diagnosis of acute appendicitis in patients presenting with atypical clinical findings is assessed. Patients and Methods: Eighty patients presenting with acute abdominal pain and possible acute appendicitis but atypical findings were included in this study. After intravenous injection of TC-WBC, serial anterior abdominal/pelvic images at 30, 60, 120 and 240 min with 800k counts were obtained with a gamma camera. Any abnormal localization of radioactivity in the right lower quadrant of the abdomen, equal to or greater than bone marrow activity, was considered as a positive scan. Results: 36 out of 49 patients showing positive TC-WBC scans received appendectomy. They all proved to have positive pathological findings. Five positive TC-WBC were not related to acute appendicitis, because of other pathological lesions. Eight patients were not operated and clinical follow-up after one month revealed no acute abdominal condition. Three of 31 patients with negative TC-WBC scans received appendectomy. They also presented positive pathological findings. The remaining 28 patients did not receive operations and revealed no evidence of appendicitis after at least one month of follow-up. The overall sensitivity, specificity, accuracy, positive and negative predictive values for TC-WBC scan to diagnose acute appendicitis were 92, 78, 86, 82, and 90%, respectively. Conclusion: TC-WBC scan provides a rapid and highly accurate method for the diagnosis of acute appendicitis in patients with equivocal clinical examination. It proved useful in reducing the false-positive rate of laparotomy and shortens the time necessary for clinical observation.
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Costanzo M, Ponikowski P, Javaheri S, Augostini R, Goldberg L, Holcomb R, Kao A, Khayat R, Oldenburg O, Stellbrink C, Abraham W. P588Effects of phrenic nerve stimulation on central sleep apnea in heart failure patients. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx501.p588] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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31
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Karl K, Borkon A, Aggarwal S, Allen K, Davis R, Pak A, Thompson E, Wang J, Kao A, Magalski A, Lawhorn S, Khumari T, Austin B. Strategies to Reduce Tricuspid Regurgitation After Heart Transplant. J Heart Lung Transplant 2017. [DOI: 10.1016/j.healun.2017.01.408] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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32
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Hall S, Pinney S, Sninsky J, Machrus M, Woodward R, Kao A. Analysis of Individual Gene Expression Levels Indicates the Impact of Physiological Functions on Gene Expression Profiling Scores. J Heart Lung Transplant 2017. [DOI: 10.1016/j.healun.2017.01.1130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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Magalski A, Beauchamp S, Borkon A, Kao A, Aggarwal S, Pak A, Wang J, Allen K. Challenges of Heart Transplant in Patients with L-Transposition of the Great Vessels. J Heart Lung Transplant 2017. [DOI: 10.1016/j.healun.2017.01.727] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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Beauchamp S, Borkon A, Karl K, Aggarwal S, Kao A, Magalski A, Allen K, Austin B, Khumari T, Lawhorn S, Long N, Wang J, Davis R, Thompson E, Pak A. Cocaine Use Does Not Contribute to Accelerated CAD as Determined by Angiography or IVUS. J Heart Lung Transplant 2017. [DOI: 10.1016/j.healun.2017.01.1462] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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Hoskin B, Lobosco S, Bell D, Kao A, Hall S, Chen SY. FRI0321 Association between Disease Severity and Patient-Reported Outcomes in Patients with Discoid Lupus Erythematosus in Real-World Clinical Practice. Ann Rheum Dis 2016. [DOI: 10.1136/annrheumdis-2016-eular.3954] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Borkon M, Aggarwal S, Dryton G, Kao A, Allen K, Davis R, Pak A, Thompson E, Magalski A, Austin B, Khumari T, Lawhorne S, Gosch K. Tricuspid Annuloplasty Definitely Improves Patient Outcomes in the First Year After Heart Transplantation. J Heart Lung Transplant 2016. [DOI: 10.1016/j.healun.2016.01.571] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Kao A, Georgakopoulos D, Smith J, Pomfret D, Aggarwal S. Modulation of Autonomic Tone Assessed by Heart Rate Variability in Advanced Heart Failure Patients Treated with an Extra-Aortic Counterpulsation (EACP) System: A Single Center Experience. J Heart Lung Transplant 2016. [DOI: 10.1016/j.healun.2016.01.912] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Kao A, Eaton M, Knutson C, Linard J, House J, Austin B, Everley M, Khumri T, Lawhorn S, Magalski A, Borkon A, Safley D. Use of Rapamycin One-Year Post Heart Transplantation Stabilizes Transplant Allograft Vasculopathy - The Mid America Experience. J Heart Lung Transplant 2015. [DOI: 10.1016/j.healun.2015.01.227] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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Lee JH, Kim JW, Levy M, Kao A, Noh SH, Bozovic D, Cheon J. Magnetic nanoparticles for ultrafast mechanical control of inner ear hair cells. ACS NANO 2014; 8:6590-8. [PMID: 25004005 DOI: 10.1021/nn5020616] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
We introduce cubic magnetic nanoparticles as an effective tool for precise and ultrafast control of mechanosensitive cells. The temporal resolution of our system is ∼1000 times faster than previously used magnetic switches and is comparable to the current state-of-the-art optogenetic tools. The use of a magnetism-gated switch reported here can address the key challenges of studying mechanotransduction in biological systems. The cube-shaped magnetic nanoparticles are designed to bind to components of cellular membranes and can be controlled with an electromagnet to exert pico-Newtons of mechanical force on the cells. The cubic nanoparticles can thus be used for noncontact mechanical control of the position of the stereocilia of an inner ear hair cell, yielding displacements of tens of nanometers, with sub-millisecond temporal resolution. We also prove that such mechanical stimulus leads to the influx of ions into the hair cell. Our study demonstrates that a magnetic switch can yield ultrafast temporal resolution, and has capabilities for remote manipulation and biological specificity, and that such magnetic system can be used for the study of mechanotransduction processes of a wide range of sensory systems.
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Kao A, Arnold P, Hiller D. Gene Expression Profile Score Variability Characteristics: Analysis of 49,836 Tests From 12,177 Heart Transplant Patients. J Heart Lung Transplant 2014. [DOI: 10.1016/j.healun.2014.01.364] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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41
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Lai D, Frampton JP, Tsuei M, Kao A, Takayama S. Label-free direct visual analysis of hydrolytic enzyme activity using aqueous two-phase system droplet phase transitions. Anal Chem 2014; 86:4052-7. [PMID: 24654925 PMCID: PMC4004187 DOI: 10.1021/ac500657k] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
![]()
Dextran hydrolysis-mediated conversion
of polyethylene glycol (PEG)-dextran
(DEX) aqueous two-phase system droplets to a single phase was used
to directly visualize Dextranase activity. DEX droplets were formed
either by manual micropipetting or within a continuous PEG phase by
computer controlled actuation of an orifice connecting rounded channels
formed by backside diffused light lithography. The time required for
the two-phase to one-phase transition was dependent on the Dextranase
concentration, pH of the medium, and temperature. The apparent Michaelis
constants for Dextranase were estimated based on previously reported
catalytic constants, the binodal polymer concentration curves for
PEG-DEX phase transition for each temperature, and pH condition. The
combination of a microfluidic droplet system and phase transition
observation provides a new method for label-free direct measurement
of enzyme activity.
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Lévy M, Lee JH, Kao A, Kim JW, Noh SH, Choi YJ, Bozovic D, Cheon J. Fast and Local Mechanotransduction Control via Magnetic Nanoparticles: Mechanical Stimulation of Auditory Cells. Biophys J 2014. [DOI: 10.1016/j.bpj.2013.11.3975] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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43
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Frampton JP, Shi H, Kao A, Parent JM, Takayama S. Delivery of proteases in aqueous two-phase systems enables direct purification of stem cell colonies from feeder cell co-cultures for differentiation into functional cardiomyocytes. Adv Healthc Mater 2013; 2:1440-4. [PMID: 23592706 PMCID: PMC4103153 DOI: 10.1002/adhm.201300049] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2013] [Revised: 02/13/2013] [Indexed: 12/31/2022]
Abstract
Patterning of bioactive enzymes with subcellular resolution is achieved by dispensing droplets of dextran (DEX) onto polyethylene glycol (PEG)-covered cells though a glass capillary needle connected to a pneumatic pump. This technique is applied to purify colonies of induced pluripotent stem cells (iPSCs) from mouse embryonic fibroblast (MEF) feeder cultures and inefficiently induced iPSC colonies by selectively dissociating the iPSCs with proteases.
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Shlomovitz R, Fredrickson-Hemsing L, Kao A, Meenderink SWF, Bruinsma R, Bozovic D. Low frequency entrainment of oscillatory bursts in hair cells. Biophys J 2013; 104:1661-9. [PMID: 23601313 DOI: 10.1016/j.bpj.2013.02.050] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2012] [Revised: 02/19/2013] [Accepted: 02/22/2013] [Indexed: 10/27/2022] Open
Abstract
Sensitivity of mechanical detection by the inner ear is dependent upon a highly nonlinear response to the applied stimulus. Here we show that a system of differential equations that support a subcritical Hopf bifurcation, with a feedback mechanism that tunes an internal control parameter, captures a wide range of experimental results. The proposed model reproduces the regime in which spontaneous hair bundle oscillations are bistable, with sporadic transitions between the oscillatory and the quiescent state. Furthermore, it is shown, both experimentally and theoretically, that the application of a high-amplitude stimulus to the bistable system can temporarily render it quiescent before recovery of the limit cycle oscillations. Finally, we demonstrate that the application of low-amplitude stimuli can entrain bundle motility either by mode-locking to the spontaneous oscillation or by mode-locking the transition between the quiescent and oscillatory states.
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Khush K, Pham M, Teuteberg J, Kfoury A, Starling R, Deng M, Cappola T, Kao A, Anderson A, Cotts W, Ewald G, Baran D, Bogaev R, Hlatky M, Elashoff B, Hiller D, Yee J, Valantine H. Racial Disparities after Heart Transplant: Evidence from IMAGE. J Heart Lung Transplant 2013. [DOI: 10.1016/j.healun.2013.01.1022] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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46
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Deng M, Elashoff B, Hiller D, Pham M, Teuteberg J, Kfoury A, Starling R, Kao A, Anderson A, Cotts W, Ewald G, Baran D, Yee J, Valantine H. Utility of Gene Expression Profiling Test Score Stability To Predict Future Clinical Events in Heart Transplant Recipients. J Heart Lung Transplant 2013. [DOI: 10.1016/j.healun.2013.01.500] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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47
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Barbero R, Carnelli L, Simon A, Kao A, Monforte AD, Riccò M, Bianchi D, Belcher A. Engineered yeast for enhanced CO 2 mineralization. ENERGY & ENVIRONMENTAL SCIENCE 2013; 6:660-674. [PMID: 25289021 PMCID: PMC4185198 DOI: 10.1039/c2ee24060b] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
In this work, a biologically catalyzed CO2 mineralization process for the capture of CO2 from point sources was designed, constructed at a laboratory scale, and, using standard chemical process scale-up protocols, was modeled and evaluated at an industrial scale. A yeast display system in Saccharomyces cerevisae was used to screen several carbonic anhydrase isoforms and mineralization peptides for their impact on CO2 hydration, CaCO3 mineralization, and particle settling rate. Enhanced rates for each of these steps in the CaCO3 mineralization process were confirmed using quantitative techniques in lab-scale measurements. The effect of these enhanced rates on the CO2 capture cost in an industrial scale CO2 mineralization process using coal fly ash as the CaO source was evaluated. The model predicts a process using bCA2- yeast and fly ash is ~10% more cost effective per ton of CO2 captured than a process with no biological molecules, a savings not realized by wild-type yeast and high-temperature stable recombinant CA2 alone or in combination. The levelized cost of electricity for a power plant using this process was calculated and scenarios in which this process compares favorably to CO2 capture by MEA absorption process are presented.
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Kao A, Meenderink SW, Bozovic D. Self Tuning of Hair Cell Bundle after Prolonged Deflection. Biophys J 2013. [DOI: 10.1016/j.bpj.2012.11.1838] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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49
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Austin B, Wang E, Arnold P, Kao A. 472 Younger Age and Female Gender Are Associated with Higher Gene Expression Profile Values. J Heart Lung Transplant 2012. [DOI: 10.1016/j.healun.2012.01.483] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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50
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St. Clair K, Eaton M, Linard J, Knutson C, Borkon A, Kao A. 474 Successful Use of Gene Expression Profile Testing To Help with Corticosteroid Weaning Post Orthotopic Heart Transplant, the Mid America Experience. J Heart Lung Transplant 2012. [DOI: 10.1016/j.healun.2012.01.485] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
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