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Wang S, Yan Z, Shen F, Du L, Li G, Yang Q, Hu Q. Novel aptasensor based on polyaniline functionalized carboxylated dobby carbon nanotubes and molybdenum disulfide for endotoxin detection. Talanta 2024; 276:126256. [PMID: 38762977 DOI: 10.1016/j.talanta.2024.126256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2024] [Revised: 05/07/2024] [Accepted: 05/11/2024] [Indexed: 05/21/2024]
Abstract
Endotoxins, also known as lipopolysaccharides (LPS), are present within the cell walls of Gram-negative bacteria and are released upon cellular death, which can pose a significant risk to human and animal health. Due to the minimal amount of endotoxin required to trigger an inflammatory response in human body, the demand for sensitive methods with low endotoxin detection limits is essential necessary. This paper presents a straightforward aptamer sensor which can enhance the conductivity and specific surface area of molybdenum disulfide (MoS2) by incorporating carboxylated multi-walled carbon nanotubes (MWCNTs-COOH) and polyaniline (PANI). Doping with gold nanoparticles (AuNPs) improves biocompatibility and sensitivity while providing binding sites for thiolated endotoxin-binding aptamers (LBA). This biosensor achieved a remarkable detection limit as low as 0.5 fg mL-1, enabling trace-level identification of LPS. It also exhibits excellent repeatability, selectivity, and stability, facilitating rapid and accurate LPS detection. Moreover, this method demonstrates high recovery rates and specificity for LPS analysis in food samples, showcasing its promising application prospects in trace-level LPS detection within the food industry.
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Affiliation(s)
- Sen Wang
- College of Food Science and Engineering, Nanjing University of Finance and Economics, Nanjing, 210023, China; Collaborative Innovation Center for Modern Grain Circulation and Safety, Nanjing, 210023, China
| | - Zhongjun Yan
- Zhejiang Branch of China Grain Reserves Group Ltd. Company, China
| | - Fei Shen
- College of Food Science and Engineering, Nanjing University of Finance and Economics, Nanjing, 210023, China; Collaborative Innovation Center for Modern Grain Circulation and Safety, Nanjing, 210023, China.
| | - Lihui Du
- College of Food Science and Engineering, Nanjing University of Finance and Economics, Nanjing, 210023, China; Collaborative Innovation Center for Modern Grain Circulation and Safety, Nanjing, 210023, China
| | - Guanglei Li
- College of Food Science and Engineering, Nanjing University of Finance and Economics, Nanjing, 210023, China; Collaborative Innovation Center for Modern Grain Circulation and Safety, Nanjing, 210023, China
| | - Qian Yang
- College of Food Science and Engineering, Nanjing University of Finance and Economics, Nanjing, 210023, China; Collaborative Innovation Center for Modern Grain Circulation and Safety, Nanjing, 210023, China
| | - Qiuhui Hu
- College of Food Science and Engineering, Nanjing University of Finance and Economics, Nanjing, 210023, China; Collaborative Innovation Center for Modern Grain Circulation and Safety, Nanjing, 210023, China
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Dong WS, Hu C, Hu M, Gao YP, Hu YX, Li K, Ye YJ, Zhang X. Metrnl: a promising biomarker and therapeutic target for cardiovascular and metabolic diseases. Cell Commun Signal 2024; 22:389. [PMID: 39103830 DOI: 10.1186/s12964-024-01767-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2024] [Accepted: 07/27/2024] [Indexed: 08/07/2024] Open
Abstract
Modern human society is burdened with the pandemic of cardiovascular and metabolic diseases. Metrnl is a widely distributed secreted protein in the body, involved in regulating glucose and lipid metabolism and maintaining cardiovascular system homeostasis. In this review, we present the predictive and therapeutic roles of Metrnl in various cardiovascular and metabolic diseases, including atherosclerosis, ischemic heart disease, cardiac remodeling, heart failure, hypertension, chemotherapy-induced myocardial injury, diabetes mellitus, and obesity.
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Affiliation(s)
- Wen-Sheng Dong
- Department of Geriatrics, Hubei Key Laboratory of Metabolic and Chronic Diseases, Renmin Hospital of Wuhan University, Wuhan University at Jiefang Road 238, Wuhan, 430060, China
| | - Can Hu
- Department of Ultrasound, Union Hospital, Tongji Medical College, Clinical Research Center for Medical Imaging in Hubei Province, Hubei Province Key Laboratory of Molecular Imaging, Huazhong University of Science and Technology, Wuhan, Hubei, 430022, China
| | - Min Hu
- Department of Cardiology, Hubei Key Laboratory of Metabolic and Chronic Diseases, Renmin Hospital of Wuhan University, Wuhan, 430060, China
| | - Yi-Peng Gao
- Department of Cardiology, Hubei Key Laboratory of Metabolic and Chronic Diseases, Renmin Hospital of Wuhan University, Wuhan, 430060, China
| | - Yu-Xin Hu
- Department of Geriatrics, Hubei Key Laboratory of Metabolic and Chronic Diseases, Renmin Hospital of Wuhan University, Wuhan University at Jiefang Road 238, Wuhan, 430060, China
| | - Kang Li
- Department of Geriatrics, Hubei Key Laboratory of Metabolic and Chronic Diseases, Renmin Hospital of Wuhan University, Wuhan University at Jiefang Road 238, Wuhan, 430060, China
| | - Yun-Jia Ye
- Department of Geriatrics, Hubei Key Laboratory of Metabolic and Chronic Diseases, Renmin Hospital of Wuhan University, Wuhan University at Jiefang Road 238, Wuhan, 430060, China
| | - Xin Zhang
- Department of Geriatrics, Hubei Key Laboratory of Metabolic and Chronic Diseases, Renmin Hospital of Wuhan University, Wuhan University at Jiefang Road 238, Wuhan, 430060, China.
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Jin Z, Yim W, Retout M, Housel E, Zhong W, Zhou J, Strano MS, Jokerst JV. Colorimetric sensing for translational applications: from colorants to mechanisms. Chem Soc Rev 2024; 53:7681-7741. [PMID: 38835195 DOI: 10.1039/d4cs00328d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2024]
Abstract
Colorimetric sensing offers instant reporting via visible signals. Versus labor-intensive and instrument-dependent detection methods, colorimetric sensors present advantages including short acquisition time, high throughput screening, low cost, portability, and a user-friendly approach. These advantages have driven substantial growth in colorimetric sensors, particularly in point-of-care (POC) diagnostics. Rapid progress in nanotechnology, materials science, microfluidics technology, biomarker discovery, digital technology, and signal pattern analysis has led to a variety of colorimetric reagents and detection mechanisms, which are fundamental to advance colorimetric sensing applications. This review first summarizes the basic components (e.g., color reagents, recognition interactions, and sampling procedures) in the design of a colorimetric sensing system. It then presents the rationale design and typical examples of POC devices, e.g., lateral flow devices, microfluidic paper-based analytical devices, and wearable sensing devices. Two highlighted colorimetric formats are discussed: combinational and activatable systems based on the sensor-array and lock-and-key mechanisms, respectively. Case discussions in colorimetric assays are organized by the analyte identities. Finally, the review presents challenges and perspectives for the design and development of colorimetric detection schemes as well as applications. The goal of this review is to provide a foundational resource for developing colorimetric systems and underscoring the colorants and mechanisms that facilitate the continuing evolution of POC sensors.
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Affiliation(s)
- Zhicheng Jin
- Aiiso Yufeng Li Family Department of Chemical and Nano Engineering, University of California, San Diego, La Jolla, CA 92093, USA.
| | - Wonjun Yim
- Materials Science and Engineering Program, University of California, San Diego, La Jolla, CA 92093, USA
| | - Maurice Retout
- Aiiso Yufeng Li Family Department of Chemical and Nano Engineering, University of California, San Diego, La Jolla, CA 92093, USA.
| | - Emily Housel
- Aiiso Yufeng Li Family Department of Chemical and Nano Engineering, University of California, San Diego, La Jolla, CA 92093, USA.
| | - Wenbin Zhong
- School of Chemistry, Chemical Engineering and Biotechnology, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore
| | - Jiajing Zhou
- Aiiso Yufeng Li Family Department of Chemical and Nano Engineering, University of California, San Diego, La Jolla, CA 92093, USA.
| | - Michael S Strano
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Jesse V Jokerst
- Aiiso Yufeng Li Family Department of Chemical and Nano Engineering, University of California, San Diego, La Jolla, CA 92093, USA.
- Materials Science and Engineering Program, University of California, San Diego, La Jolla, CA 92093, USA
- Department of Radiology, University of California, San Diego, La Jolla, CA 92093, USA
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Wang Z, Li R, Chen X, Ren H, Wang C, Min R, Zhang X. Network pharmacology, molecular docking and experimental validation to elucidate the anti-T2DM mechanism of Lanxangia tsaoko. Fitoterapia 2024; 178:106117. [PMID: 38996878 DOI: 10.1016/j.fitote.2024.106117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2024] [Revised: 07/04/2024] [Accepted: 07/05/2024] [Indexed: 07/14/2024]
Abstract
Lanxangia tsaoko (L. tsaoko) is a natural medicine which could be used to treat type 2 diabetes mellitus (T2DM). However, there is no systematic and comprehensive research on the its active compounds and mechanism. This study aimed to investigate the active ingredients and potential mechanism of L. tsaoko for the treatment of T2DM. The chemical constituents of L. tsaoko were identified by UPLC-Q-Exactive Orbitrap/MS. The active compounds and mechanism of L. tsaoko were predicted by network pharmacology. Then the docking modes of key components and core targets were analyzed by molecular docking. Finally, animal experiments were conducted to verify the efficacy and targets of L. tsaoko in T2DM treatment. 70 compounds from L. tsaoko were identified. We obtained 37 active components, including quercetin, genistein and kaempferol, 5 core targets were AKT1, INS, TP53, TNF and IL-6. Mainly involved in PI3K/Akt, MAPK, RAGE/AGE, HIF-1, FoxO signaling pathways. Molecular docking results showed that the L. tsaoko had good binding potential to TNF. Therefore, we took the inflammatory mechanism as the prediction target for experimental verification. Animal experiments showed that L. tsaoko could alleviated colon injury of T2DM mice, improve glucose metabolism and decrease inflammatory levels. L. tsaoko exerted therapeutic effects on T2DM through multi-component, multi-target and multi-pathway regulation. Its action mechanisms were related to PI3K/Akt, MAPK, RAGE/AGE, HIF-1 and FoxO signaling pathways. This study provided new insights for the clinical treatment of T2DM.
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Affiliation(s)
- Zhen Wang
- Department of Nutrition and Food Hygiene, College of Public Health, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, Henan, China
| | - Ruonan Li
- Department of Nutrition and Food Hygiene, College of Public Health, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, Henan, China
| | - Xiaoli Chen
- Department of Nutrition and Food Hygiene, College of Public Health, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, Henan, China
| | - Huilin Ren
- Department of Nutrition and Food Hygiene, College of Public Health, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, Henan, China
| | - Caixia Wang
- Department of Nutrition and Food Hygiene, College of Public Health, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, Henan, China
| | - Ruixue Min
- Department of Nutrition and Food Hygiene, College of Public Health, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, Henan, China
| | - Xiaofeng Zhang
- Department of Nutrition and Food Hygiene, College of Public Health, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, Henan, China.
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Fratus M, Alam MA. Theory of nanostructured sensors integrated in/on microneedles for diagnostics and therapy. Biosens Bioelectron 2024; 255:116238. [PMID: 38579625 DOI: 10.1016/j.bios.2024.116238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2024] [Revised: 03/05/2024] [Accepted: 03/21/2024] [Indexed: 04/07/2024]
Abstract
Efficient real-time diagnostics and on-demand drug delivery are essential components in modern healthcare, especially for managing chronic diseases. The lack of a rapid and effective sensing and therapeutic system can result in analyte level deviations, leading to severe complications. Minimally invasive microneedle (MN)-based patches integrating nanostructures (NSs) in their volume or on their surface have emerged as a biocompatible technology for delay-free analyte sensing and therapy. However, a quantitative relationship for the signal response in NS-assisted reactions remains elusive. Existing generalized formalisms are derived for in-vitro applications, raising questions about their direct applicability to in-situ wearable sensors. In this study, we apply the reaction-diffusion theory to establish a generalized physics-guided framework for NS-in-MN platforms in wearable applications. The model relates the signal response to analyte concentration, incorporating geometric, physical, and catalytic platform properties. Approximating the model under NS (binding or catalytic) and environmental (mass transport) limitations, we validate it against numerical simulations and various experimental results from diverse conditions - analyte sensing (glucose, lactic acid, pyocyanin, miRNA, etc.) in artificial and in-vivo environments (humans, mice, pigs, plants, etc.) through electrochemical and optical/colorimetric, enzymatic and non-enzymatic platforms. The results plotted in the scaled response show that (a) NS-limited platforms exhibit a linear dependence, (b) Mass transport-limited platforms saturate to 1, (c) a one-to-one mapping against traditional sensitivity plots unifies the scattered data points reported in literature. The universality of the model provides insightful perspectives for the design and optimization of MN-based sensing technologies, with potential extensions to dissolvable MNs as part of analyte-responsive closed-loop therapeutic applications.
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Affiliation(s)
- Marco Fratus
- Elmore Family School of Electrical and Computer Engineering, Purdue University, West Lafayette, 47906, Indiana, USA.
| | - Muhammad A Alam
- Elmore Family School of Electrical and Computer Engineering, Purdue University, West Lafayette, 47906, Indiana, USA.
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Loyez M, Fasseaux H, Lobry M, Wattiez R, Caucheteur C. Insulin biotrapping using plasmofluidic optical fiber chips: A benchmark. Biosens Bioelectron 2024; 254:116189. [PMID: 38507927 DOI: 10.1016/j.bios.2024.116189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Revised: 02/02/2024] [Accepted: 03/04/2024] [Indexed: 03/22/2024]
Abstract
Plasmonic optical fiber-based biosensors are currently in their early stages of development as practical and integrated devices, gradually making their way towards the market. While the majority of these biosensors operate using white light and multimode optical fibers (OFs), our approach centers on single-mode OFs coupled with tilted fiber Bragg gratings (TFBGs) in the near-infrared wavelength range. Our objective is to enhance surface sensitivity and broaden sensing capabilities of OF-based sensors to develop in situ sensing with remote interrogation. In this study, we comprehensively assess their performance in comparison to the gold-standard plasmonic reference, a commercial device based on the Kretschmann-Raether prism configuration. We present their refractive index sensitivity and their capability for insulin sensing using a dedicated microfluidics approach. By optimizing a consistent surface biotrapping methodology, we elucidate the dynamic facets of both technologies and highlight their remarkable sensitivity to variations in bulk and surface properties. The one-to-one comparison between both technologies demonstrates the reliability of optical fiber-based measurements, showcasing similar experimental trends obtained with both the prismatic configuration and gold-coated TFBGs, with an even enhanced limit of detection for the latter. This study lays the foundation for the detection of punctual molecular interactions and opens the way towards the detection of spatially and temporally localized events on the surface of optical probes.
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Affiliation(s)
- Médéric Loyez
- Proteomics and Microbiology Department, University of Mons (UMONS), 7000, Belgium; Electromagnetism and Telecom. Department, University of Mons (UMONS), 7000, Belgium.
| | - Hadrien Fasseaux
- Electromagnetism and Telecom. Department, University of Mons (UMONS), 7000, Belgium
| | - Maxime Lobry
- Electromagnetism and Telecom. Department, University of Mons (UMONS), 7000, Belgium
| | - Ruddy Wattiez
- Proteomics and Microbiology Department, University of Mons (UMONS), 7000, Belgium
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Lightman SL. Clinical Endocrinology-Time for a Reset? J Endocr Soc 2024; 8:bvae024. [PMID: 38440109 PMCID: PMC10910589 DOI: 10.1210/jendso/bvae024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/02/2023] [Indexed: 03/06/2024] Open
Abstract
Measurement of blood levels of circulating hormones has always been the cornerstone of the biochemical diagnosis of endocrine diseases, with the objective of detecting hormone excess or insufficiency. Unfortunately, the dynamic nature of hormone secretion means single-point measurements of many hormones often lack diagnostic validity. Endocrinologists have devised complex dynamic tests as indirect assessments of the functioning of the hormone system under investigation. Recent advances in the measurement of dynamic hormone changes across the day now offer an opportunity to reconsider whether there might be better ways both to diagnose and to monitor the therapy of endocrine conditions.
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Affiliation(s)
- Stafford L Lightman
- Translational Health Sciences, The Medical School, University of Bristol, Dorothy Hodgkin Building, Whitson Street, Bristol BS1 3NY, UK
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Alanzi TM, Alzahrani W, Almoraikhi M, Algannas A, Alghamdi M, Alzahrani L, Abutaleb R, Ba Dughaish R, Alotibi N, Alkhalifah S, Alshehri M, Alzahrani H, Almahdi R, Alanzi N, Farhah N. Adoption of Wearable Insulin Biosensors for Diabetes Management: A Cross-Sectional Study. Cureus 2023; 15:e50782. [PMID: 38239544 PMCID: PMC10795719 DOI: 10.7759/cureus.50782] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/17/2023] [Indexed: 01/22/2024] Open
Abstract
BACKGROUND Wearable insulin biosensors represent a novel approach that combines the benefits of real-time glucose monitoring and automated insulin delivery, potentially revolutionizing how individuals with diabetes manage their condition. STUDY PURPOSE To analyze the behavioral intentions of wearable insulin biosensors among diabetes patients, the factors that drive or hinder their usage, and the implications for diabetes management and healthcare outcomes. METHODS A cross-sectional survey design was adopted in this study. The validated questionnaire included 10 factors (Performance expectancy, effort expectancy, social influence, facilitating conditions, behavioral intention, trust, perceived privacy risk, and personal innovativeness) affecting the acceptance of wearable insulin sensors. A total of 248 diabetic patients who had used wearable sensors participated in the study. RESULTS Performance expectancy was rated the highest (Mean = 3.84 out of 5), followed by effort expectancy (Mean = 3.78 out of 5), and trust (Mean = 3.53 out of 5). Statistically significant differences (p < 0.05) were observed with respect to socio-demographic variables including age and gender on various influencing factors and adoption intentions. PE, EE, and trust were positively associated with adoption intentions. CONCLUSION While wearable insulin sensors are positively perceived with respect to diabetes management, issues like privacy and security may affect their adoption.
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Affiliation(s)
- Turki M Alanzi
- Department of Health Information Management and Technology, College of Public Health, Imam Abdulrahman Bin Faisal University, Dammam, SAU
| | - Wala Alzahrani
- Department of Clinical Nutrition, College of Applied Medical Sciences, King Abdulaziz University, Jeddah, SAU
| | | | | | - Mohammed Alghamdi
- Department of Pharmaceutical Services, Dhahran Long Term Care Hospital, Dhahran, SAU
| | | | | | | | - Nada Alotibi
- College of Pharmacy, Shaqra University, Shaqra, SAU
| | - Shayma Alkhalifah
- College of Medicine, Imam Abdulrahman Bin Faisal University, Dammam, SAU
| | - Mona Alshehri
- College of Medicine, Princess Nourah Bint Abdul Rahman University, Riyadh, SAU
| | | | - Reham Almahdi
- College of Medicine, Al Baha University, Al Baha, SAU
| | - Nouf Alanzi
- Department of Clinical Laboratories Sciences, College of Applied Medical Sciences, Jouf University, Jouf, SAU
| | - Nesren Farhah
- Department of Health Informatics, College of Health Sciences, Saudi Electronic University, Riyadh, SAU
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Nandhakumar P, Muñoz San Martín C, Arévalo B, Ding S, Lunker M, Vargas E, Djassemi O, Campuzano S, Wang J. Redox Cycling Amplified Electrochemical Lateral-Flow Immunoassay: Toward Decentralized Sensitive Insulin Detection. ACS Sens 2023; 8:3892-3901. [PMID: 37734056 DOI: 10.1021/acssensors.3c01445] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/23/2023]
Abstract
While paper-based lateral-flow immunoassays (LFA) offer considerable promise for centralized diagnostic applications, the analytical capability of conventional LFA remains constrained due to the low sensitivity of its common optical detection strategy. To address these issues, we report a simple electrochemical LFA (eLFA) with nanocatalytic redox cycling for decentralized insulin detection. Simultaneous binding of insulin with detection antibodies and capture antibodies through the capillary flow at the LFA platform and signal amplification through the rapid nanocatalytic reduction of [Fe(CN)6]3- (Fe3+) with Au nanoparticles (AuNP) and ammonia-borane (AB), coupled to electrochemical redox cycling reactions involving Fe3+, AuNP, and AB on the carbon working electrode, offer higher sensitivity than conventional colorimetric LFA and enzymatic redox cycling. The resulting integrated eLFA strip allows the detection of low insulin concentrations (LOD = 12 pM) and offers considerable promise for highly sensitive decentralized assays of different biological fluids (saliva and serum) without additional pretreatment or washing steps.
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Affiliation(s)
- Ponnusamy Nandhakumar
- Department of Nanoengineering, University of California San Diego, La Jolla, California 92093, United States
| | - Cristina Muñoz San Martín
- Department of Nanoengineering, University of California San Diego, La Jolla, California 92093, United States
- Departamento de Química Analítica, Universidad Complutense, E-28040 Madrid, Spain
| | - Beatriz Arévalo
- Department of Nanoengineering, University of California San Diego, La Jolla, California 92093, United States
- Departamento de Química Analítica, Universidad Complutense, E-28040 Madrid, Spain
| | - Shichao Ding
- Department of Nanoengineering, University of California San Diego, La Jolla, California 92093, United States
| | - Mahika Lunker
- Department of Nanoengineering, University of California San Diego, La Jolla, California 92093, United States
| | - Eva Vargas
- Department of Nanoengineering, University of California San Diego, La Jolla, California 92093, United States
| | - Omeed Djassemi
- Department of Nanoengineering, University of California San Diego, La Jolla, California 92093, United States
| | - Susana Campuzano
- Departamento de Química Analítica, Universidad Complutense, E-28040 Madrid, Spain
| | - Joseph Wang
- Department of Nanoengineering, University of California San Diego, La Jolla, California 92093, United States
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