25 results on '"Pereda J"'
Search Results
2. Constrained MPC for Intercluster Energy Control of Modular Multilevel Matrix Converters
- Author
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Cuzmar, R, Montenegro, A, Mora, A, Pereda, J, Aguilera, RP, Cuzmar, R, Montenegro, A, Mora, A, Pereda, J, and Aguilera, RP
- Abstract
This article presents a circulating current reference generator based on a constrained model predictive control approach to perform the intercluster capacitor voltage balancing in modular multilevel matrix converters (M3C). The proposed reference generator incorporates nominal current limits as bound constraints into the optimal control problem. This approach enables the reference generator to efficiently provide the necessary circulating current in each cluster, thereby balancing the energies of the converter's clusters. As a result, the M3C can operate even during critical frequency points, significant power steps, and severe imbalance levels while ensuring that every cluster current remains within its feasible limits. Experimental results on a M3C prototype of 36 submodules are provided to validate the effectiveness and high-quality performance of the proposed strategy.
- Published
- 2024
3. An Improved Reference Generator Based on MPC of Circulating Currents and Common-Mode Voltage for Modular Multilevel Matrix Converters
- Author
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Cuzmar, RH, Mora, A, Pereda, J, Aguilera, RP, Cuzmar, RH, Mora, A, Pereda, J, and Aguilera, RP
- Published
- 2024
4. Predictive Optimal Variable-Angle PS-PWM Strategy for Cascaded H-Bridge Converters
- Author
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Poblete, P, Gajardo, J, Cuzmar, RH, Aguilera, RP, Pereda, J, Lu, D, Marquez, AM, Poblete, P, Gajardo, J, Cuzmar, RH, Aguilera, RP, Pereda, J, Lu, D, and Marquez, AM
- Abstract
Cascaded H-bridge (CHB) converters are an attractive candidate for numerous applications, including static synchronous compensators and next-generation photovoltaic and battery energy storage inverters. Due to its simplicity, scalability, and excellent harmonic performance, phase-shifted pulsewidth modulation (PS-PWM) is one of the preferred modulation strategies for CHB converters. However, the latter advantage might be drastically affected when an unbalanced operation in the H-bridge cells is required, e.g., setting different dc-voltage levels and/or ac-voltage references among cells. This work proposes a predictive optimal variable angle PS-PWM (OVA-PS-PWM) strategy for CHB converters. The proposed OVA-PS-PWM introduces a bilinear dynamic model that describes the impact of the phase-shift angles (PS-angles) over the CHB output voltage harmonics. This model is then employed to formulate an optimal control problem that minimizes the output voltage harmonic distortion. An analytical optimal solution for a PS-angle update rule that applies to CHB converters of any number of cells is derived. As a result, the proposed OVA-PS-PWM updates each PS-angle at every sampling instant, significantly improving the harmonic content of the CHB output voltage even under severely unbalanced operation scenarios. Experimental results are provided with a CHB converter with nine cells to verify the effectiveness of the proposed optimal modulation strategy.
- Published
- 2024
5. Long-Horizon Sequential FCS-MPC Approaches for Modular Multilevel Matrix Converters
- Author
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Cuzmar, RH, Mora, A, Pereda, J, Poblete, P, Aguilera, RP, Cuzmar, RH, Mora, A, Pereda, J, Poblete, P, and Aguilera, RP
- Abstract
The modular multilevel matrix converter (M3C) is a direct ac-ac power converter that presents several features such as scalable and flexible structure, high efficiency, fault-tolerant capability, and high power quality. However, this converter requires a complex control strategy to govern the cluster currents and balance the internal floating capacitor voltages among clusters and cells. To fulfill these requirements, this article proposes a long-horizon sequential finite-control-set model predictive control (sFCS-MPC). The resulting predictive strategy is formulated to perform both the local cell balancing control and to regulate cluster currents of the M3C in a unified control algorithm, considering the nonlinear and coupled dynamic model of each cluster. Additionally, the total available combinations and the average cell switching frequency are reduced. The proposed sFCS-MPC is implanted for a prediction horizon from one to four, and compared with some previous FCS-MPC approaches. Experimental results on a 3-kW prototype are provided to demonstrate the effectiveness and high-quality performance of the proposed strategy.
- Published
- 2024
6. Design, Analysis and Experimental Verification of Arm Link Enhanced Modular Multilevel Converter
- Author
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Aguilar, R., primary, Tarisciotti, L., additional, and Pereda, J., additional
- Published
- 2024
- Full Text
- View/download PDF
7. LB1712 A clinical study of atomic-force microscopy-based rapid atopic dermatitis severity assessment
- Author
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Pereda, J., primary, Liao, H., additional, Wang, J., additional, Raun, E., additional, Nørgaard, L.O., additional, Dons, F.E., additional, and Hwu, E., additional
- Published
- 2023
- Full Text
- View/download PDF
8. Optimal Switching Sequence Direct Power Control for AC/DC Converters with Enhanced Converter Model for Lower Switching Frequencies
- Author
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Poblete, P, Syasegov, YY, Farhangi, M, Aguilera, RP, Siwakoti, YP, Lu, D, Pereda, J, Poblete, P, Syasegov, YY, Farhangi, M, Aguilera, RP, Siwakoti, YP, Lu, D, and Pereda, J
- Abstract
Grid-connected AC/DC power converters play a crucial role in integrating renewable energies, smart grids, and motor drives. Consequently, high-performance control techniques have constantly attracted the interest of researchers. Predictive direct power control (P-DPC) strategies are promising control techniques for these converters, due to their fast transient response. However, standard P-DPC strategies cannot effectively compensate for steady-state errors when the switching frequency is reduced, due to model inaccuracies. This work proposes a new optimal switching sequence direct power control (OSS-DPC) strategy, which enhances the converter discrete-time model by estimating the grid currents and voltages at each commutation instant within a sampling period. As a result, the proposed OSS-DPC provides a fast dynamic response with reduced overshoot and improved steady-state performance, outperforming the standard P-DPC strategies.
- Published
- 2023
9. Computationally Efficient MPC for Modular Multilevel Matrix Converters Operating With Fixed Switching Frequency
- Author
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Cuzmar, RH, Mora, A, Pereda, J, Aguilera, RP, Poblete, P, Neira, S, Cuzmar, RH, Mora, A, Pereda, J, Aguilera, RP, Poblete, P, and Neira, S
- Abstract
Modular multilevel matrix converters stand out for their performance in ac-ac high-power conversion. However, they require multiple control loops to govern the currents from both ac ports, the internal circulating currents, and the capacitor voltages. This article proposes a computationally efficient model predictive control (MPC) strategy based on a new converter modeling to exploit the phase-shifted pulsewidth modulation working principle fully, achieving four improvements: 1) control unification of both ac-ports currents, circulating currents, and capacitor voltages; 2) constrained optimization to safeguard the converter limits; 3) computational burden reduction and high scalability compared to standard MPC strategies; and 4) wide frequency operation with fast closed-loop transient responses, low harmonic distortion, and fixed switching frequency.
- Published
- 2023
10. Optimal Switching Sequence MPC for Four-Leg Two-Level Grid-Connected Converters
- Author
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Mora, A, Leiva, F, Cardenas, R, Rojas, F, Pereda, J, Aguilera, RP, Travieso, JC, Mora, A, Leiva, F, Cardenas, R, Rojas, F, Pereda, J, Aguilera, RP, and Travieso, JC
- Abstract
This paper presents a versatile and effective model predictive current control strategy based on optimal switching sequences for four–leg two–level grid–connected converters. The proposed control methodology, presents an excellent dynamic performance, good tracking of high-frequency reference signals, fixed switching frequency, and well-formed harmonic spectrum, enabling the proposed controller to govern shunt active filters and distributed generation applications based on four-leg converters. Experimental results demonstrate the effectiveness and high-quality performance obtained with the proposed strategy.
- Published
- 2023
11. Distributed Neural Network Observer for Submodule Capacitor Voltage Estimation in Modular Multilevel Converters
- Author
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Poblete, P, Pizarro, G, Droguett, G, Nunez, F, Judge, PD, Pereda, J, Poblete, P, Pizarro, G, Droguett, G, Nunez, F, Judge, PD, and Pereda, J
- Abstract
Modular multilevel converters (MMCs) have become one of the most popular power converters for medium/high-power transmission systems and motor drive applications. Standard control schemes for MMCs use a voltage measurement per submodule (SM) to balance the capacitor voltages and govern the MMC. Consequently, the control system requires a significant amount of sensors and the effective communication of sensitive data under relevant electromagnetic interference (EMI), impacting the reliability and cost of the MMC. This work presents a distributed neural network (DNN) observer inspired by a general predictor-corrector structure for estimating the capacitor voltages at each SM. The proposed observer predicts each SM capacitor voltage using a standard average model. Then, each prediction is corrected and denoised by a neural network of reduced computational complexity. As a result, the proposed observer reduces the number of required voltage sensors per arm to only one and filters the high-frequency noise without noticeable delay in the estimated SM capacitor voltages for both transient and steady-state operations. Experiments conducted in a three-phase MMC with 24 SMs confirm the effectiveness of the proposed DNN observer.
- Published
- 2022
12. A DFT study on magnetic interfaces based on half-metallic Co2FeGe1/2Ga1/2 with h-BN and MoSe2 monolayers
- Author
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Larionov, Konstantin V., primary, Pais Pereda, J. J., additional, and Sorokin, Pavel B., additional
- Published
- 2022
- Full Text
- View/download PDF
13. A DFT study on magnetic interfaces based on half-metallic Co2FeGe1/2Ga1/2 with h-BN and MoSe2 monolayers.
- Author
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Larionov, Konstantin V., Pais Pereda, J. J., and Sorokin, Pavel B.
- Abstract
A large variety of recently predicted and synthesized 2D materials significantly broaden the capabilities of magnetic interface design for spintronic applications. Their diverse structural and electronic properties allow fine adjustment of interfacial interactions between the electrode and spacer materials providing robust and effective spin transport. Based on recent experimental results, here we present a theoretical study of novel interfaces formed by a half-metallic Co
2 FeGe1/2 Ga1/2 (CFGG) substrate with h-BN or MoSe2 monolayer on its top. By means of the DFT approach, the structural, magnetic and electronic properties are studied for the Co- and FeGeGa termination of the CFGG surface. The observed large spin polarization in the vicinity of the interface and robust magnetization exhibit the potential of 2D materials/CFGG heterostructures for spintronic applications. [ABSTRACT FROM AUTHOR]- Published
- 2022
- Full Text
- View/download PDF
14. A Review of Atomic-Force Microscopy in Skin Barrier Function Assessment.
- Author
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Pereda J, Milde Khatib C, Kezic S, Christensen MO, Yang S, Thyssen JP, Chu CY, Riethmüller C, Liao HS, Akhtar I, Ungar B, Guttman-Yassky E, Hædersdal M, and Hwu ET
- Subjects
- Humans, Skin pathology, Skin diagnostic imaging, Skin Diseases pathology, Microscopy, Atomic Force methods
- Abstract
Skin barrier function (SBF) disorders are a class of pathologies that affect a significant portion of the world population. These disorders cause skin lesions with intense itch, impacting patients' physical and psychological well-being as well as their social functioning. It is in the interest of patients that their disorder be monitored closely while under treatment to evaluate the effectiveness of the ongoing therapy and any potential adverse reactions. Symptom-based assessment techniques are widely used by clinicians; however, they carry some limitations. Techniques to assess skin barrier impairment are critical for understanding the nature of the disease and for helping personalize treatment. This review recalls the anatomy of the skin barrier and describes an atomic-force microscopy approach to quantitatively monitor its disorders and their response to treatment. We review a panel of studies that show that this technique is highly relevant for SBF disorder research, and we aim to motivate its adoption into clinical settings., (Copyright © 2024 The Authors. Published by Elsevier Inc. All rights reserved.)
- Published
- 2024
- Full Text
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15. A Cross-Sectional Study to Assess the Knowledge of Pharmacy Students About Drug Pollution in Spain.
- Author
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Abajo Z, Domingo-Echaburu S, Évora C, Pereda J, Alvarez-Lorenzo C, Rabasco AM, De la Casa-Resino I, Carapeto R, Argaluza J, Lertxundi U, and Orive G
- Subjects
- Humans, Spain, Cross-Sectional Studies, Surveys and Questionnaires, Female, Male, Adult, Young Adult, Environmental Pollution, Drug Contamination, Students, Pharmacy psychology, Health Knowledge, Attitudes, Practice, Education, Pharmacy methods
- Abstract
The presence of pharmaceuticals in the environment is an issue of growing concern. The European Commission adopted the "European Union Strategic Approach to Pharmaceuticals in the Environment", which focuses on actions to reduce the risk of pharmaceuticals in the environment, including how environmental aspects can become part of medical training programs., Objective: Obtain data from pharmacy students about pharmaceutical pollution to provide information about the training needs that may help develop new actions related to the training and dissemination of this issue., Methods: A total of 1614 pharmacy students from 5 Schools of Pharmacy in Spain completed a self-administered questionnaire consisting of 24 questions: 13 about knowledge, 8 related to attitude, and 3 to opinion., Results: Around 75% of students reported that they did not know "One Health" or "emerging pollutant" concepts and around 88% declared that they did not know that diclofenac caused a catastrophic vulture decline in Asia. The importance of this topic and their attitude to acquiring new knowledge was evaluated higher than 8 points out of 10, while received training during their studies was a score of 2.8 points out of 10., Conclusion: The knowledge about key concepts was relatively poor. In fact, they judged training about pharmaceuticals in the environment during their pharmacy studies was very scarce. However, students consider drug pollution to be a very important issue and have a very good attitude toward acquiring knowledge about it., Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 American Association of Colleges of Pharmacy. Published by Elsevier Inc. All rights reserved.)
- Published
- 2024
- Full Text
- View/download PDF
16. Aberrant TIMP-1 production in tumor-associated fibroblasts drives the selective benefits of nintedanib in lung adenocarcinoma.
- Author
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Duch P, Díaz-Valdivia N, Gabasa M, Ikemori R, Arshakyan M, Fernández-Nogueira P, Llorente A, Teixido C, Ramírez J, Pereda J, Chuliá-Peris L, Galbis JM, Hilberg F, Reguart N, Radisky DC, and Alcaraz J
- Subjects
- Animals, Humans, Mice, Cell Line, Tumor, Tumor Microenvironment drug effects, Xenograft Model Antitumor Assays, Cell Proliferation drug effects, Carcinoma, Squamous Cell drug therapy, Carcinoma, Squamous Cell pathology, Carcinoma, Squamous Cell metabolism, Carcinoma, Squamous Cell genetics, Antineoplastic Agents pharmacology, Antineoplastic Agents therapeutic use, Female, Cancer-Associated Fibroblasts metabolism, Cancer-Associated Fibroblasts drug effects, Tissue Inhibitor of Metalloproteinase-1 metabolism, Tissue Inhibitor of Metalloproteinase-1 genetics, Lung Neoplasms drug therapy, Lung Neoplasms pathology, Lung Neoplasms metabolism, Lung Neoplasms genetics, Indoles pharmacology, Indoles therapeutic use, Adenocarcinoma of Lung drug therapy, Adenocarcinoma of Lung pathology, Adenocarcinoma of Lung metabolism, Adenocarcinoma of Lung genetics, Smad3 Protein metabolism
- Abstract
The fibrotic tumor microenvironment is a pivotal therapeutic target. Nintedanib, a clinically approved multikinase antifibrotic inhibitor, is effective against lung adenocarcinoma (ADC) but not squamous cell carcinoma (SCC). Previous studies have implicated the secretome of tumor-associated fibroblasts (TAFs) in the selective effects of nintedanib in ADC, but the driving factor(s) remained unidentified. Here we examined the role of tissue inhibitor of metalloproteinase-1 (TIMP-1), a tumor-promoting cytokine overproduced in ADC-TAFs. To this aim, we combined genetic approaches with in vitro and in vivo preclinical models based on patient-derived TAFs. Nintedanib reduced TIMP-1 production more efficiently in ADC-TAFs than SCC-TAFs through a SMAD3-dependent mechanism. Cell culture experiments indicated that silencing TIMP1 in ADC-TAFs abolished the therapeutic effects of nintedanib on cancer cell growth and invasion, which were otherwise enhanced by the TAF secretome. Consistently, co-injecting ADC cells with TIMP1-knockdown ADC-TAFs into immunocompromised mice elicited a less effective reduction of tumor growth and invasion under nintedanib treatment compared to tumors bearing unmodified fibroblasts. Our results unveil a key mechanism underlying the selective mode of action of nintedanib in ADC based on the excessive production of TIMP-1 in ADC-TAFs. We further pinpoint reduced SMAD3 expression and consequent limited TIMP-1 production in SCC-TAFs as key for the resistance of SCC to nintedanib. These observations strongly support the emerging role of TIMP-1 as a critical regulator of therapy response in solid tumors., (© 2024 The Authors. Cancer Science published by John Wiley & Sons Australia, Ltd on behalf of Japanese Cancer Association.)
- Published
- 2024
- Full Text
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17. miRNAs Related to Immune Checkpoint Inhibitor Response: A Systematic Review.
- Author
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García-Giménez JL, Saadi W, Ortega AL, Lahoz A, Suay G, Carretero J, Pereda J, Fatmi A, Pallardó FV, and Mena-Molla S
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- Humans, Gene Expression Regulation, Neoplastic drug effects, Biomarkers, Tumor genetics, MicroRNAs genetics, Immune Checkpoint Inhibitors adverse effects, Immune Checkpoint Inhibitors therapeutic use, Neoplasms genetics, Neoplasms drug therapy, Neoplasms immunology
- Abstract
The advent of immune checkpoint inhibitors (ICIs) has represented a breakthrough in the treatment of many cancers, although a high number of patients fail to respond to ICIs, which is partially due to the ability of tumor cells to evade immune system surveillance. Non-coding microRNAs (miRNAs) have been shown to modulate the immune evasion of tumor cells, and there is thus growing interest in elucidating whether these miRNAs could be targetable or proposed as novel biomarkers for prognosis and treatment response to ICIs. We therefore performed an extensive literature analysis to evaluate the clinical utility of miRNAs with a confirmed direct relationship with treatment response to ICIs. As a result of this systematic review, we have stratified the miRNA landscape into (i) miRNAs whose levels directly modulate response to ICIs, (ii) miRNAs whose expression is modulated by ICIs, and (iii) miRNAs that directly elicit toxic effects or participate in immune-related adverse events (irAEs) caused by ICIs.
- Published
- 2024
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18. The Role of Aryl Hydrocarbon Receptor in the Endothelium: A Systematic Review.
- Author
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Guerra-Ojeda S, Suarez A, Valls A, Verdú D, Pereda J, Ortiz-Zapater E, Carretero J, Mauricio MD, and Serna E
- Subjects
- Humans, Receptors, Aryl Hydrocarbon genetics, Familial Primary Pulmonary Hypertension, Endothelium, Vascular Diseases, Environmental Pollutants
- Abstract
Activation of the aryl hydrocarbon receptor (AhR) has been shown to be important in physiological processes other than detoxification, including vascular homeostasis. Although AhR is highly expressed in the endothelium, its function has been poorly studied. This systematic review aims to summarise current knowledge on the AhR role in the endothelium and its cardiovascular implications. We focus on endogenous AhR agonists, such as some uremic toxins and other agonists unrelated to environmental pollutants, as well as studies using AhR knockout models. We conclude that AhR activation leads to vascular oxidative stress and endothelial dysfunction and that blocking AhR signalling could provide a new target for the treatment of vascular disorders such as cardiovascular complications in patients with chronic kidney disease or pulmonary arterial hypertension.
- Published
- 2023
- Full Text
- View/download PDF
19. Engineered flavoproteins as bioorthogonal photo-triggers for the activation of metal-based anticancer prodrugs.
- Author
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Mazzei LF, Gurruchaga-Pereda J, Martínez Á, Martínez JC, Salassa L, and Cortajarena AL
- Subjects
- Flavoproteins, Cisplatin, Riboflavin pharmacology, Cell Line, Tumor, Prodrugs pharmacology, Antineoplastic Agents pharmacology
- Abstract
A multifunctional hybrid constructed for controlling the delivery and activation of Pt anticancer agents in vitro is described herein. We employed consensus tetratricopeptide repeat protein (CTPR) for the covalent co-anchoring of riboflavin (photocatalyst) and a Pt(IV) prodrug complex. The Pt-loaded flavoprotein induced a 40% reduction in PANC-1 cell viability as a result of the photocatalytic formation of cisplatin.
- Published
- 2023
- Full Text
- View/download PDF
20. Synthesis, Characterization and Photoactivation Studies on the Novel Pt(IV)-Based [Pt(OCOCH 3 ) 3 (phterpy)] Complex.
- Author
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Canil G, Gurruchaga-Pereda J, Braccini S, Marchetti L, Funaioli T, Marchetti F, Pratesi A, Salassa L, and Gabbiani C
- Subjects
- Humans, Organoplatinum Compounds chemistry, Light, Magnetic Resonance Spectroscopy, Antineoplastic Agents chemistry, Prodrugs chemistry
- Abstract
Photoactivatable Pt(IV) prodrugs represent nowadays an intriguing class of potential metal-based drugs, endowed with more chemical inertness in their oxidized form and better selectivity for the target with respect to the clinically established Pt(II) compounds. In fact, they have the possibility to be reduced by light irradiation directly at the site of interest. For this reason, we synthesized a new Pt(IV) complex, [Pt(OCOCH
3 )3 (4'-phenyl-2,2':6',2''-terpyridine)][CF3 SO3 ] ( 1 ), that is well soluble in aqueous medium and totally unreactive towards selected model biomolecules until its reduction. The highlight of this work is the rapid and efficient photoreduction of 1 with visible light (460 nm), which leads to its reactive Pt(II) analogue. This behavior was made possible by taking advantage of an efficient catalytic system based on flavin and NADH, which is naturally present in the cellular environment. As a comparison, the reduction of 1 was also studied with simple UV irradiation, but both UV-Vis spectrophotometry and1 H-NMR spectrometry showed that the flavin-catalyzed reduction with visible light was faster. Lastly, the reactivity against two representative biological targets, i.e., human serum albumin and one monofilament oligonucleotide fragment, was evaluated by high-resolution mass spectrometry. The results clearly pointed out that the prodrug 1 did not interact with these targets until its photoreduction to the Pt(II) analogue.- Published
- 2023
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21. Acute Sheehan's Syndrome Presenting with Hyponatremia Followed by a Spontaneous Pregnancy.
- Author
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Pineyro MM, Diaz L, Guzzetti M, Risso M, and Pereda J
- Abstract
Background: Acute Sheehan's syndrome is rare, as well as hyponatremia as its initial manifestation. In addition, spontaneous pregnancy in patients after Sheehan's syndrome is unusual. To our knowledge, no cases of spontaneous pregnancy after acute Sheehan's syndrome have been reported. We describe a case of Sheehan's syndrome that presented with acute hyponatremia and a spontaneous pregnancy., Case: A 34-year-old female developed blood loss during delivery, which required a blood transfusion. On day seven postpartum, she presented with headaches, lethargy, and difficulty in breastfeeding. The workup showed hyponatremia (118 mEq/l), secondary hypothyroidism, and low prolactin levels. Magnetic resonance imaging showed pituitary necrosis. She was treated with NaCl, hydrocortisone (cortisol results were not available), and levothyroxine. Laboratory tests six weeks after discharge showed low IGF-1 and 8 AM cortisol and normal FT4, LH, FSH, and PRL levels. She was able to partially breastfeed until 4 months postpartum. Regular menstrual cycles started three months later. She became spontaneously pregnant one year later., Conclusion: Acute Sheehan's syndrome should be considered in the evaluation of postpartum patients with suggestive symptoms. Physicians should be aware that hyponatremia could be an initial manifestation of Sheehan's syndrome, which requires a high index of suspicion for diagnosis. Spontaneous pregnancy can occur after acute Sheehan's syndrome., Competing Interests: The authors declare that they have no conflicts of interest., (Copyright © 2022 Maria M. Pineyro et al.)
- Published
- 2022
- Full Text
- View/download PDF
22. Open-source controller for low-cost and high-speed atomic force microscopy imaging of skin corneocyte nanotextures.
- Author
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Liao HS, Akhtar I, Werner C, Slipets R, Pereda J, Wang JH, Raun E, Nørgaard LO, Dons FE, and Hwu EET
- Abstract
High-speed atomic force microscopes (HS-AFMs) with high temporal resolution enable dynamic phenomena to be visualized at nanoscale resolution. However, HS-AFMs are more complex and costlier than conventional AFMs, and particulars of an open-source HS-AFM controller have not been published before. These high entry barriers hinder the popularization of HS-AFMs in both academic and industrial applications. In addition, HS-AFMs generally have a small imaging area that limits the fields of implementation. This study presents an open-source controller that enables a low-cost simplified AFM to achieve a maximum tip-sample velocity of 5,093 µm/s (9.3 s/frame, 512 × 512 pixels), which is nearly 100 times higher than that of the original controller. Moreover, the proposed controller doubles the imaging area to 46.3 × 46.3 µm
2 compared to that of the original system. The low-cost HS-AFM can successfully assess the severity of atopic dermatitis (AD) by measuring the nanotexture of human skin corneocytes in constant height DC mode. The open-source controller-based HS-AFM system costs less than $4,000, which provides resource-limited research institutes with affordable access to high-throughput nanoscale imaging to further expand the HS-AFM research community., Competing Interests: The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: The author Dr. En-Te Hwu was a technical consultant of the simplified AFM company (Strømlinet Nano). This does not affect his adherence to scientific standards., (© 2022 The Author(s).)- Published
- 2022
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23. Matrix Metalloproteinases and Their Inhibitors in Pulmonary Fibrosis: EMMPRIN/CD147 Comes into Play.
- Author
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Chuliá-Peris L, Carreres-Rey C, Gabasa M, Alcaraz J, Carretero J, and Pereda J
- Subjects
- Extracellular Matrix pathology, Humans, Matrix Metalloproteinases, Tissue Inhibitor of Metalloproteinases, Basigin, Pulmonary Fibrosis drug therapy, Pulmonary Fibrosis pathology
- Abstract
Pulmonary fibrosis (PF) is characterized by aberrant extracellular matrix (ECM) deposition, activation of fibroblasts to myofibroblasts and parenchymal disorganization, which have an impact on the biomechanical traits of the lung. In this context, the balance between matrix metalloproteinases (MMPs) and their tissue inhibitors of metalloproteinases (TIMPs) is lost. Interestingly, several MMPs are overexpressed during PF and exhibit a clear profibrotic role (MMP-2, -3, -8, -11, -12 and -28), but a few are antifibrotic (MMP-19), have both profibrotic and antifibrotic capacity (MMP7), or execute an unclear (MMP-1, -9, -10, -13, -14) or unknown function. TIMPs are also overexpressed in PF; hence, the modulation and function of MMPs and TIMP are more complex than expected. EMMPRIN/CD147 (also known as basigin) is a transmembrane glycoprotein from the immunoglobulin superfamily (IgSF) that was first described to induce MMP activity in fibroblasts. It also interacts with other molecules to execute non-related MMP aactions well-described in cancer progression, migration, and invasion. Emerging evidence strongly suggests that CD147 plays a key role in PF not only by MMP induction but also by stimulating fibroblast myofibroblast transition. In this review, we study the structure and function of MMPs, TIMPs and CD147 in PF and their complex crosstalk between them.
- Published
- 2022
- Full Text
- View/download PDF
24. A DFT study on magnetic interfaces based on half-metallic Co 2 FeGe 1/2 Ga 1/2 with h-BN and MoSe 2 monolayers.
- Author
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Larionov KV, Pais Pereda JJ, and Sorokin PB
- Abstract
A large variety of recently predicted and synthesized 2D materials significantly broaden the capabilities of magnetic interface design for spintronic applications. Their diverse structural and electronic properties allow fine adjustment of interfacial interactions between the electrode and spacer materials providing robust and effective spin transport. Based on recent experimental results, here we present a theoretical study of novel interfaces formed by a half-metallic Co
2 FeGe1/2 Ga1/2 (CFGG) substrate with h-BN or MoSe2 monolayer on its top. By means of the DFT approach, the structural, magnetic and electronic properties are studied for the Co- and FeGeGa termination of the CFGG surface. The observed large spin polarization in the vicinity of the interface and robust magnetization exhibit the potential of 2D materials/CFGG heterostructures for spintronic applications.- Published
- 2022
- Full Text
- View/download PDF
25. Combined treatment for optic disc pit maculopathy secondary to glaucoma.
- Author
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Torres Ledesma B, Bueno García P, and Torres Pereda JP
- Subjects
- Humans, Male, Middle Aged, Retrospective Studies, Eye Abnormalities, Glaucoma etiology, Macular Degeneration, Optic Disk
- Abstract
Case Report: A 58-year-old man was referred to the retina specialist for evaluation of decreased vision in the left eye (LE). At the first visit, visual acuity was 0.9 in right eye (RE) and hands movement in LE, and the intraocular pressure (IOP) was 34 mmHg and 42 mmHg in right and left eye, respectively. Dilated funduscopic examination revealed papillary pallor, increased cup-to-disc ratio of the optic nerve in both eyes, and retinal posterior pole oedema in the LE. Optical coherence tomography (OCT) and fluorescein angiography assessment confirmed the diagnosis of a macular serous retinal detachment (RD) caused by an optic disc pit secondary to glaucoma. Combined surgical treatment with ExPress drainage device implantation, pars plana vitrectomy (PPV), and juxtapapillar laser endophotocoagulation was performed. The IOP returned to normal, as well as complete anatomical resolution of macular RD., (Copyright © 2020 Sociedad Española de Oftalmología. Published by Elsevier España, S.L.U. All rights reserved.)
- Published
- 2021
- Full Text
- View/download PDF
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