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Sedaghat S, Krishnakumar A, Selvamani V, Barnard JP, Nejati S, Wang H, Detwiler DA, Seleem MN, Rahimi R. Laser-assisted surface alloying of titanium with silver to enhance antibacterial and bone-cell mineralization properties of orthopedic implants. J Mater Chem B 2024; 12:4489-4501. [PMID: 38644661 PMCID: PMC11078329 DOI: 10.1039/d3tb02481d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2023] [Accepted: 03/13/2024] [Indexed: 04/23/2024]
Abstract
Orthopedic device-related infection (ODRI) poses a significant threat to patients with titanium-based implants. The challenge lies in developing antibacterial surfaces that preserve the bulk mechanical properties of titanium implants while exhibiting characteristics similar to bone tissue. In response, we present a two-step approach: silver nanoparticle (AgNP) coating followed by selective laser-assisted surface alloying on commonly used titanium alumina vanadium (TiAl6V4) implant surfaces. This process imparts antibacterial properties without compromising the bulk mechanical characteristics of the titanium alloy. Systematic optimization of laser beam power (8-40 W) resulted in an optimized surface (32 W) with uniform TiAg alloy formation. This surface displayed a distinctive hierarchical mesoporous textured surface, featuring cauliflower-like nanostructures measuring between 5-10 nm uniformly covering spatial line periods of 25 μm while demonstrating homogenous elemental distribution of silver throughout the laser processed surface. The optimized laser processed surface exhibited prolonged superhydrophilicity (40 days) and antibacterial efficacy (12 days) against Staphylococcus aureus and Escherichia coli. Additionally, there was a significant twofold increase in bone mineralization compared to the pristine Ti6Al4V surface (p < 0.05). Rockwell hardness tests confirmed minimal (<1%) change in bulk mechanical properties compared to the pristine surface. This innovative laser-assisted approach, with its precisely tailored surface morphology, holds promise for providing enduring antibacterial and osteointegration properties, rendering it an optimal choice for modifying load-bearing implant devices without altering material bulk characteristics.
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Affiliation(s)
- Sotoudeh Sedaghat
- School of Materials Engineering, Purdue University, West Lafayette, IN 47907, USA.
- Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907, USA
| | - Akshay Krishnakumar
- Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907, USA
- School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47907, USA
| | - Vidhya Selvamani
- School of Materials Engineering, Purdue University, West Lafayette, IN 47907, USA.
- Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907, USA
| | - James P Barnard
- School of Materials Engineering, Purdue University, West Lafayette, IN 47907, USA.
| | - Sina Nejati
- School of Materials Engineering, Purdue University, West Lafayette, IN 47907, USA.
- Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907, USA
| | - Haiyan Wang
- School of Materials Engineering, Purdue University, West Lafayette, IN 47907, USA.
| | - David A Detwiler
- Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907, USA
- Nanovis, West Lafayette, West Lafayette, IN 47907, USA
| | - Mohamed N Seleem
- Department of Biomedical Sciences and Pathobiology, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA
| | - Rahim Rahimi
- School of Materials Engineering, Purdue University, West Lafayette, IN 47907, USA.
- Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907, USA
- School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47907, USA
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Gopalakrishnan S, Thomas R, Sedaghat S, Krishnakumar A, Khan S, Meyer T, Ajieren H, Nejati S, Wang J, Verma MS, Irazoqui P, Rahimi R. Smart capsule for monitoring inflammation profile throughout the gastrointestinal tract. Biosens Bioelectron X 2023; 14:100380. [PMID: 37799507 PMCID: PMC10552446 DOI: 10.1016/j.biosx.2023.100380] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 10/07/2023]
Abstract
Inflammatory bowel disease (IBD) has become alarmingly prevalent in the last two decades affecting 6.8 million people worldwide with a starkly high relapse rate of 40% within 1 year of remission. Existing visual endoscopy techniques rely on subjective assessment of images that are error-prone and insufficient indicators of early-stage IBD, rendering them unsuitable for frequent and quantitative monitoring of gastrointestinal health necessary for detecting regular relapses in IBD patients. To address these limitations, we have implemented a miniaturized smart capsule (2.2 cm × 11 mm) that allows monitoring reactive oxygen species (ROS) levels as a biomarker of inflammation for quantitative and frequent profiling of inflammatory lesions throughout the gastrointestinal tract. The capsule is composed of a pH and oxidation reduction potential (ORP) sensor to track the capsule's location and ROS levels throughout the gastrointestinal tract, respectively, and an optimized electronic interface for wireless sensing and data communication. The designed sensors provided a linear and stable performance within the physiologically relevant range of the GI tract (pH: 1-8 and ORP: -500 to +500 mV). Additionally, systematic design optimization of the wireless interface electronics offered an efficient sampling rate of 10 ms for long-running measurements up to 48 h for a complete evaluation of the entire gastrointestinal tract. As a proof-of-concept, the capsule the capsule's performance in detecting inflammation risks was validated by conducting tests on in vitro cell culture conditions, simulating healthy and inflamed gut-like environments. The capsule presented here achieves a new milestone in addressing the emerging need for smart ingestible electronics for better diagnosis and treatment of digestive diseases.
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Affiliation(s)
- Sarath Gopalakrishnan
- School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN, 47907, USA
- Birck Nanotechnology Center, Purdue University, West Lafayette, IN, 47907, USA
| | - Rithu Thomas
- School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN, 47907, USA
| | - Sotoudeh Sedaghat
- Birck Nanotechnology Center, Purdue University, West Lafayette, IN, 47907, USA
- School of Materials Engineering, Purdue University, West Lafayette, IN, 47907, USA
| | - Akshay Krishnakumar
- School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN, 47907, USA
- Birck Nanotechnology Center, Purdue University, West Lafayette, IN, 47907, USA
| | - Sadid Khan
- Department of Electrical and Computer Engineering, Johns Hopkins University, Baltimore, MD, 21218, USA
| | - Trevor Meyer
- Department of Electrical and Computer Engineering, Johns Hopkins University, Baltimore, MD, 21218, USA
| | - Hans Ajieren
- Department of Electrical and Computer Engineering, Johns Hopkins University, Baltimore, MD, 21218, USA
| | - Sina Nejati
- Birck Nanotechnology Center, Purdue University, West Lafayette, IN, 47907, USA
- School of Materials Engineering, Purdue University, West Lafayette, IN, 47907, USA
| | - Jiangshan Wang
- Birck Nanotechnology Center, Purdue University, West Lafayette, IN, 47907, USA
- Department of Agricultural and Biological Engineering, West Lafayette, IN, 47907, USA
| | - Mohit S. Verma
- Birck Nanotechnology Center, Purdue University, West Lafayette, IN, 47907, USA
- Department of Agricultural and Biological Engineering, West Lafayette, IN, 47907, USA
- Weldon School of Biomedical Engineering, West Lafayette, IN, 47907, USA
| | - Pedro Irazoqui
- Department of Electrical and Computer Engineering, Johns Hopkins University, Baltimore, MD, 21218, USA
| | - Rahim Rahimi
- School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN, 47907, USA
- Birck Nanotechnology Center, Purdue University, West Lafayette, IN, 47907, USA
- School of Materials Engineering, Purdue University, West Lafayette, IN, 47907, USA
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Saha A, Sedaghat S, Gopalakrishnan S, Waimin J, Yermembetova A, Glassmaker N, Mousoulis C, Shakouri A, Wei A, Rahimi R, Alam MA. A new paradigm of reliable sensing with field-deployed electrochemical sensors integrating data redundancy and source credibility. Sci Rep 2023; 13:3101. [PMID: 36813820 PMCID: PMC9946936 DOI: 10.1038/s41598-022-25920-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2022] [Accepted: 12/07/2022] [Indexed: 02/24/2023] Open
Abstract
For a continuous healthcare or environmental monitoring system, it is essential to reliably sense the analyte concentration reported by electrochemical sensors. However, environmental perturbation, sensor drift, and power-constraint make reliable sensing with wearable and implantable sensors difficult. While most studies focus on improving sensor stability and precision by increasing the system's complexity and cost, we aim to address this challenge using low-cost sensors. To obtain the desired accuracy from low-cost sensors, we borrow two fundamental concepts from communication theory and computer science. First, inspired by reliable data transmission over a noisy communication channel by incorporating redundancy, we propose to measure the same quantity (i.e., analyte concentration) with multiple sensors. Second, we estimate the true signal by aggregating the output of the sensors based on their credibility, a technique originally developed for "truth discovery" in social sensing applications. We use the Maximum Likelihood Estimation to estimate the true signal and the credibility index of the sensors over time. Using the estimated signal, we develop an on-the-fly drift-correction method to make unreliable sensors reliable by correcting any systematic drifts during operation. Our approach can determine solution pH within 0.09 pH for more than three months by detecting and correcting the gradual drift of pH sensors as a function of gamma-ray irradiation. In the field study, we validate our method by measuring nitrate levels in an agricultural field onsite over 22 days within 0.06 mM of a high-precision laboratory-based sensor. We theoretically demonstrate and numerically validate that our approach can estimate the true signal even when the majority (~ 80%) of the sensors are unreliable. Moreover, by restricting wireless transmission to high-credible sensors, we achieve near-perfect information transfer at a fraction of the energy cost. The high-precision sensing with low-cost sensors at reduced transmission cost will pave the way for pervasive in-field sensing with electrochemical sensors. The approach is general and can improve the accuracy of any field-deployed sensors undergoing drift and degradation during operation.
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Affiliation(s)
- Ajanta Saha
- grid.169077.e0000 0004 1937 2197School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47906 USA
| | - Sotoudeh Sedaghat
- grid.169077.e0000 0004 1937 2197Department of Materials Engineering, Purdue University, West Lafayette, IN 47907 USA ,grid.169077.e0000 0004 1937 2197Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907 USA
| | - Sarath Gopalakrishnan
- grid.169077.e0000 0004 1937 2197School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47906 USA
| | - Jose Waimin
- grid.169077.e0000 0004 1937 2197Department of Materials Engineering, Purdue University, West Lafayette, IN 47907 USA
| | - Aiganym Yermembetova
- grid.169077.e0000 0004 1937 2197Department of Materials Engineering, Purdue University, West Lafayette, IN 47907 USA
| | - Nicholas Glassmaker
- grid.169077.e0000 0004 1937 2197Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907 USA
| | - Charilaos Mousoulis
- grid.169077.e0000 0004 1937 2197School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47906 USA
| | - Ali Shakouri
- grid.169077.e0000 0004 1937 2197School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47906 USA
| | - Alexander Wei
- grid.169077.e0000 0004 1937 2197Department of Materials Engineering, Purdue University, West Lafayette, IN 47907 USA ,grid.169077.e0000 0004 1937 2197Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907 USA ,grid.169077.e0000 0004 1937 2197Department of Chemistry, Purdue University, West Lafayette, IN 47906 USA
| | - Rahim Rahimi
- grid.169077.e0000 0004 1937 2197Department of Materials Engineering, Purdue University, West Lafayette, IN 47907 USA
| | - Muhammad A. Alam
- grid.169077.e0000 0004 1937 2197School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47906 USA
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Nejati S, Wang J, Sedaghat S, Balog NK, Long AM, Rivera UH, Kasi V, Park K, Johnson JS, Verma MS, Rahimi R. Smart capsule for targeted proximal colon microbiome sampling. Acta Biomater 2022; 154:83-96. [PMID: 36162763 PMCID: PMC9986838 DOI: 10.1016/j.actbio.2022.09.050] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Revised: 09/03/2022] [Accepted: 09/19/2022] [Indexed: 12/14/2022]
Abstract
The gastrointestinal (GI) tract, particularly the colon region, holds a highly diverse microbial community that plays an important role in the metabolism, physiology, nutrition, and immune function of the host body. Accumulating evidence has revealed that alteration in these microbial communities is the pivotal step in developing various metabolic diseases, including obesity, inflammatory bowel disease (IBD), and colorectal cancer. However, there is still a lack of clear understanding of the interrelationship between microbiota and diet as well as the effectiveness of chemoprevention strategies, including pre and probiotic agents in modifying the colonic microbiota and preventing digestive diseases. Existing methods for assessing these microbiota-diet interactions are often based on samples collected from the feces or endoscopy techniques which are incapable of providing information on spatial variations of the gut microbiota or are considered invasive procedures. To address this need, here we have developed an electronic-free smart capsule that enables site-specific sampling of the gut microbiome within the proximal colon region of the GI tract. The 3D printed device houses a superabsorbent hydrogel bonded onto a flexible polydimethylsiloxane (PDMS) disk that serves as a milieu to collect the fluid in the gut lumen and its microbiome by rapid swelling and providing the necessary mechanical actuation to close the capsule after the sampling is completed. The targeted colonic sampling is achieved by coating the sampling aperture on the capsule with a double-layer pH-sensitive enteric coating, which delays fluid in the lumen from entering the capsule until it reaches the proximal colon of the GI tract. To identify the appropriate pH-responsive double-layer coating and processing condition, a series of systematic dissolution characterizations in different pH conditions that mimicked the GI tract was conducted. The effective targeted microbial sampling performance and preservation of the smart capsule with the optimized design were validated using both realistic in vitro GI tract models with mixed bacteria cultures and in vivo with pigs as an animal model. The results from 16s rRNA and WideSeq analysis in both in vitro and in vivo studies showed that the bacterial population sampled within the retrieved capsule closely matched the bacterial population within the targeted sampling region (proximal colon). Herein, it is envisioned that such smart sampling capsule technology will provide new avenues for gastroenterological research and clinical applications, including diet-host-microbiome relationships, focused on human GI function and health. STATEMENT OF SIGNIFICANCE: The colonic microbiota plays a major role in the etiology of numerous diseases. Extensive efforts have been conducted to monitor the gut microbiome using sequencing technologies based on samples collected from feces or mucosal biopsies that are typically obtained by colonoscopy. Despite the simplicity of fecal sampling procedures, they are incapable of preserving spatial and temporal information about the bacteria through the gastrointestinal (GI) tract. In contrast, colonoscopy is an invasive and impractical approach to frequently assess the effect of dietary and therapeutic intake on the microbiome and their impact on the health of the patient. Here, we developed a non-invasive capsule that enables targeted sampling from the ascending colon, thereby providing crucial information for disease prediction and monitoring.
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Affiliation(s)
- Sina Nejati
- School of Materials Engineering, Purdue University, West Lafayette, IN 47907, United States; Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907, United States
| | - Jiangshan Wang
- Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907, United States; Department of Agricultural and Biological Engineering, Purdue University, West Lafayette, IN 47907, United States
| | - Sotoudeh Sedaghat
- School of Materials Engineering, Purdue University, West Lafayette, IN 47907, United States; Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907, United States
| | - Nicole K Balog
- School of Materials Engineering, Purdue University, West Lafayette, IN 47907, United States; Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907, United States
| | - Amanda M Long
- USDA-ARS Livestock Behavior Research Unit, West Lafayette, IN 47907, United States
| | - Ulisses Heredia Rivera
- School of Materials Engineering, Purdue University, West Lafayette, IN 47907, United States; Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907, United States
| | - Venkat Kasi
- School of Materials Engineering, Purdue University, West Lafayette, IN 47907, United States; Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907, United States
| | - Kinam Park
- Departments of Biomedical Engineering and Pharmaceutics, Purdue University, West Lafayette, IN 47907, United States
| | - Jay S Johnson
- USDA-ARS Livestock Behavior Research Unit, West Lafayette, IN 47907, United States
| | - Mohit S Verma
- Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907, United States; Department of Agricultural and Biological Engineering, Purdue University, West Lafayette, IN 47907, United States; Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN, United States
| | - Rahim Rahimi
- School of Materials Engineering, Purdue University, West Lafayette, IN 47907, United States; Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907, United States.
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Langguth P, Aludin S, Horr A, Campbell GM, Lebenatus A, Salehi Ravesh M, Schunk D, Austein F, Larsen N, Syrek H, Both M, Jansen O, Sedaghat S. Iodine uptake of adrenal glands: A novel and reliable spectral dual-layer computed tomographic-derived biomarker for acute septic shock. Eur J Radiol 2022; 156:110492. [PMID: 36108480 DOI: 10.1016/j.ejrad.2022.110492] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Revised: 08/09/2022] [Accepted: 08/15/2022] [Indexed: 11/26/2022]
Abstract
OBJECTIVES Septic shock is a potentially fatal condition. This study aims to assess whether iodine uptake and iodine density of abdominal organs on dual-layer spectral detector computed tomography (SDCT) could serve as a new imaging biomarker for patients in septic shock. METHODS Here, 95 patients who received contrast-enhanced abdominal CT examinations were included and separated into two groups: group A - septic shock; group B - no shock condition. Preselected abdominal (right and left adrenal gland, right and left kidney, infrarenal inferior vena cava (IVC), pancreas, spleen, and liver) localizations were independently evaluated by two radiologists, who measured iodine concentrations (mg/ml) and Hounsfield units (HU). RESULTS In all, 1520 measurements of iodine concentrations in mg/ml and HU were performed, with 27 patients in group A and 68 in group B. Iodine concentrations in mg/ml and HU correlated significantly in all organs measured. The corresponding correlation coefficient (r) ranged from 0.809 (pancreas) to 0.963 (right kidney). Inter-rater reliability (IRR) was very good for mg/ml (κ = 0.8; p < 0.01) and good for HU (κ = 0.773; p < 0.01) measurements. The mean iodine concentration and HU of the adrenal glands in septic and nonseptic patients was 4.88 ± 1.16 mg/ml/153 ± 36 HU and 2.67 ± 1.07 mg/ml/112 ± 41 HU, respectively. Iodine concentrations in the adrenal glands were significantly higher in group A than in group B patients (p < 0.01). The other organs remained unaffected and no significant difference was observed between patients in group A and B. Patients in group A presented significantly more often with an iodine uptake of >3.5 mg/ml of one adrenal gland (sensitivity = 0.926, specificity = 0.849, AUC = 0.951) or/and a combined concentration of >7 mg/ml of both adrenal glands (sensitivity = 0.889, specificity = 0.836, AUC = 0.928). CONCLUSION SDCT-derived iodine concentration of the adrenal glands could serve as a novel imaging biomarker for patients in acute septic shock. Our data suggest that an iodine uptake of >3.5 mg/ml of at least one adrenal gland or a combined iodine uptake of >7 mg/ml in both adrenal glands identifies patients in this condition.
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Affiliation(s)
- P Langguth
- Department for Radiology and Neuroradiology, University Hospital Schleswig-Holstein, Campus Kiel, Germany.
| | - S Aludin
- Department for Radiology and Neuroradiology, University Hospital Schleswig-Holstein, Campus Kiel, Germany
| | - A Horr
- Department for Radiology and Neuroradiology, University Hospital Schleswig-Holstein, Campus Kiel, Germany
| | | | - A Lebenatus
- Department for Radiology and Neuroradiology, University Hospital Schleswig-Holstein, Campus Kiel, Germany
| | - M Salehi Ravesh
- Department for Radiology and Neuroradiology, University Hospital Schleswig-Holstein, Campus Kiel, Germany
| | - D Schunk
- Department for Interdisciplinary Emergency, University Hospital Schleswig-Holstein, Campus Kiel, Germany
| | - F Austein
- Department of Diagnostic and Interventional Neuroradiology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - N Larsen
- Department for Radiology and Neuroradiology, University Hospital Schleswig-Holstein, Campus Kiel, Germany
| | - H Syrek
- Mediri GmbH, Heidelberg, Germany
| | - M Both
- Department for Radiology and Neuroradiology, University Hospital Schleswig-Holstein, Campus Kiel, Germany
| | - O Jansen
- Department for Radiology and Neuroradiology, University Hospital Schleswig-Holstein, Campus Kiel, Germany
| | - S Sedaghat
- Department for Radiology and Neuroradiology, University Hospital Schleswig-Holstein, Campus Kiel, Germany; Department of Radiology, University of California San Diego, San Diego, CA, United States
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Saha A, Yermembetova A, Mi Y, Gopalakrishnan S, Sedaghat S, Waimin J, Wang P, Glassmaker N, Mousoulis C, Raghunathan N, Bagchi S, Rahimi R, Shakouri A, Wei A, Alam MA. Temperature Self-Calibration of Always-On, Field-Deployed Ion-Selective Electrodes Based on Differential Voltage Measurement. ACS Sens 2022; 7:2661-2670. [PMID: 36074898 DOI: 10.1021/acssensors.2c01163] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Originally developed for use in controlled laboratory settings, potentiometric ion-selective electrode (ISE) sensors have recently been deployed for continuous, in situ measurement of analyte concentration in agricultural (e.g., nitrate), environmental (e.g., ocean acidification), industrial (e.g., wastewater), and health-care sectors (e.g., sweat sensors). However, due to uncontrolled temperature and lack of frequent calibration in these field applications, it has been difficult to achieve accuracy comparable to the laboratory setting. In this paper, we propose a novel temperature self-calibration method where the ISE sensors can serve as their own thermometer and therefore precisely measure the analyte concentration in the field condition by compensating for the temperature variations. We validate the method with controlled experiments using pH and nitrate ISEs, which use the Nernst principle for electrochemical sensing. We show that, using temperature self-calibration, pH and nitrate can be measured within 0.3% and 5% of the true concentration, respectively, under varying concentrations and temperature conditions. Moreover, we perform a field study to continuously monitor the nitrate concentration of an agricultural field over a period of 6 days. Our temperature self-calibration approach determines the nitrate concentration within 4% of the ground truth measured by laboratory-based high-precision nitrate sensors. Our approach is general and would allow battery-free temperature-corrected analyte measurement for all Nernst principle-based sensors being deployed as wearable or implantable sensors.
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Affiliation(s)
- Ajanta Saha
- School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907, United States
| | - Aiganym Yermembetova
- Department of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, United States
| | - Ye Mi
- Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, United States
| | - Sarath Gopalakrishnan
- School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907, United States
| | - Sotoudeh Sedaghat
- Department of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, United States
| | - Jose Waimin
- Department of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, United States
| | - Pengcheng Wang
- School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907, United States
| | - Nicholas Glassmaker
- Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, United States
| | - Charilaos Mousoulis
- School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907, United States
| | - Nithin Raghunathan
- Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, United States
| | - Saurabh Bagchi
- School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907, United States
| | - Rahim Rahimi
- Department of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, United States
| | - Ali Shakouri
- School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907, United States
| | - Alexander Wei
- Department of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, United States
| | - Muhammad A Alam
- School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907, United States
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Heredia Rivera U, Kadian S, Nejati S, White J, Sedaghat S, Mutlu Z, Rahimi R. Printed Low-Cost PEDOT:PSS/PVA Polymer Composite for Radiation Sterilization Monitoring. ACS Sens 2022; 7:960-971. [PMID: 35333058 DOI: 10.1021/acssensors.1c02105] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
During the γ-radiation sterilization process, the levels of radiation exposure to a medical device must be carefully monitored to achieve the required sterilization without causing deleterious effects on its intended physical and chemical properties. To address this issue, here we have demonstrated the development of an all-printed disposable low-cost sensor that exploits the change in electrical impedance of a semi-interpenetrating polymer network (SIPN) composed of poly(vinyl alcohol) (PVA) and poly(3,4-ethylenedioxythiophene):polystyrenesulfonate (PEDOT:PSS) as a functional polymer composite for radiation sterilization monitoring applications. Specifically, the PEDOT:PSS acts as the electrically conductive medium, while the PVA provides the ductility and stability of the printed sensors. During irradiation exposure, chain scission and cross-linking events occur concurrently in the PEDOT:PSS and PVA polymer chains, respectively. The concurrent scissoring of the PEDOT polymer and cross-linking of the PVA polymer network leads to the formation of a stable SIPN with reduced electrical conductivity, which was verified through FTIR, Raman, and TGA analysis. Systematic studies of different ratios of PEDOT:PSS and PVA mixtures were tested to identify the optimal ratio that provided the highest radiation sensitivity and stability performance. The results showed that PEDOT:PSS/PVA composites with 10 wt % PVA produced sensors with relative impedance changes of 30% after 25 kGy and up to 370% after 53 kGy (which are two of the most commonly used radiation exposure levels for sterilization applications). This composition showed high electrical impedance stability with less than ±5% change over 18 days after irradiation exposure. These findings demonstrate the feasibility of utilizing a printing technology for scalable manufacturing of low-cost, flexible radiation sensors for more effective monitoring of radiation sterilization processes.
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Affiliation(s)
- Ulisses Heredia Rivera
- School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, United States
- Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, United States
| | - Sachin Kadian
- School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, United States
- Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, United States
| | - Sina Nejati
- School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, United States
- Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, United States
| | - Julia White
- School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, United States
- Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, United States
| | - Sotoudeh Sedaghat
- School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, United States
- Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, United States
| | - Zeynep Mutlu
- School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, United States
- Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, United States
| | - Rahim Rahimi
- School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, United States
- Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, United States
- School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907, United States
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Kasi V, Sedaghat S, Alcaraz AM, Maruthamuthu MK, Heredia-Rivera U, Nejati S, Nguyen J, Rahimi R. Low-Cost Flexible Glass-Based pH Sensor via Cold Atmospheric Plasma Deposition. ACS Appl Mater Interfaces 2022; 14:9697-9710. [PMID: 35142483 DOI: 10.1021/acsami.1c19805] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Many commercially available pH sensors are fabricated with a glass membrane as the sensing component because of several advantages of glass-based electrodes such as versatility, high accuracy, and excellent stability in various conditions. However, because of their bulkiness and poor mechanical properties, conventional glass-based sensors are not ideal for wearable or flexible applications. Here, we report for the first time the fabrication of a flexible glass-based pH sensor suitable for biomedical and environmental applications where flexibility and stability of the sensor are critical for long-term and real-time monitoring. The sensor was fabricated via a simple and facile approach using the cold atmospheric plasma technique in which a pH sensitive silica coating was deposited from a siloxane precursor onto a carbon electrode. In order to increase the sensitivity and stability of the sensor, we employed a postprocessing step which involves annealing of the silica coated electrode at elevated temperatures. This process was optimized to ensure that the crucial properties such as porosity and hydration functionality were balanced to obtain the best and most reliable sensitivity of the sensor. Our sensitivity test results indicated that these sensors exhibit excellent and stable sensitivity with a slope of about 48 mV/pH (r2 = 0.998) and selectivity across a pH range of 4 to 10 in the presence of various cations. The optimized sensor has shown stable sensitivity for a long period of time (30 h of immersion) and in different bending conditions. We demonstrate in this investigation that this flexible cost-effective pH sensor can withstand the sterilization process resulting from ultraviolet radiation and shows repeatable sensitivity with less than ±5 mV potential drift from the sensitivity values of the standard optimized sensor.
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Affiliation(s)
- Venkat Kasi
- School of Material Engineering, Purdue University, West Lafayette, Indiana 47907, United States
- Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, United States
| | - Sotoudeh Sedaghat
- School of Material Engineering, Purdue University, West Lafayette, Indiana 47907, United States
- Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, United States
| | - Alejandro M Alcaraz
- School of Material Engineering, Purdue University, West Lafayette, Indiana 47907, United States
- Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, United States
| | - Murali Kannan Maruthamuthu
- Division of Pharmacoengineering and Molecular Pharmaceutics, Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Ulisses Heredia-Rivera
- School of Material Engineering, Purdue University, West Lafayette, Indiana 47907, United States
- Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, United States
| | - Sina Nejati
- School of Material Engineering, Purdue University, West Lafayette, Indiana 47907, United States
- Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, United States
| | - Juliane Nguyen
- Division of Pharmacoengineering and Molecular Pharmaceutics, Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Rahim Rahimi
- School of Material Engineering, Purdue University, West Lafayette, Indiana 47907, United States
- Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, United States
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9
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Nejati S, Wang J, Heredia-Rivera U, Sedaghat S, Woodhouse I, Johnson JS, Verma M, Rahimi R. Small intestinal sampling capsule for inflammatory bowel disease type detection and management. Lab Chip 2021; 22:57-70. [PMID: 34826326 DOI: 10.1039/d1lc00451d] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Although serum and fecal biomarkers (e.g., lactoferrin, and calprotectin) have been used in management and distinction between inflammatory bowel disease (IBD) and irritable bowel syndrome (IBS), none are proven to be a differential diagnostic tool between Crohn's disease (CD) and ulcerative colitis (UC). The main challenge with laboratory-based biomarkers in the stool test is the inability to indicate the location of the disease/inflammation in the gastrointestinal (GI) tract due to the homogenous nature of the collected fecal sample. For the first time, we have designed and developed a battery-free smart capsule that will allow targeted sampling of inflammatory biomarkers inside the gut lumen of the small intestine. The capsule is designed to provide a simple and non-invasive complementary tool to fecal biomarker analysis to differentiate the type of IBD by pinpointing the site of inflammatory biomarkers secretion (e.g., small or large bowel) throughout the GI tract. The capsule takes advantage of the rapid change from an acidic environment in the stomach to higher pH levels in the small intestine to dissolve a pH-sensitive polymeric coating as a means to activate the sampling process of the capsule within the small intestine. A swelling polyacrylamide hydrogel is placed inside the capsule as a milieu to collect the sampled GI fluid while also providing the required mechanical actuation to close the capsule once the sampling is completed. The hydrogel component along with the collected GI fluid can be easily obtained from the capsule through the screw-cap design for further extraction and analysis. As a proof of concept, the capsule's performance in sampling and extraction of bovine serum albumin (BSA) and calprotectin - a key biomarker of inflammation - was assessed within the physiologically relevant ranges. The ratio of extracted biomarkers relative to that in the initial sampling environment remained constant (∼3%) and independent of the sampling matrix in both in vitro and ex vivo studies. It is believed that the demonstrated technology will provide immediate impact in more effective IBD type differential diagnostic and treatment strategies by providing a non-invasive assessment of inflammation biomarkers profile throughout the digestive tract.
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Affiliation(s)
- Sina Nejati
- School of Materials Engineering, Purdue University, West Lafayette, IN, 47907, USA.
- Birck Nanotechnology Center, Purdue University, West Lafayette, IN, 47907, USA
| | - Jiangshan Wang
- Birck Nanotechnology Center, Purdue University, West Lafayette, IN, 47907, USA
- Department of Agricultural and Biological Engineering, Purdue University, West Lafayette, IN 47907, USA
| | - Ulisses Heredia-Rivera
- School of Materials Engineering, Purdue University, West Lafayette, IN, 47907, USA.
- Birck Nanotechnology Center, Purdue University, West Lafayette, IN, 47907, USA
| | - Sotoudeh Sedaghat
- School of Materials Engineering, Purdue University, West Lafayette, IN, 47907, USA.
- Birck Nanotechnology Center, Purdue University, West Lafayette, IN, 47907, USA
| | - Ian Woodhouse
- School of Materials Engineering, Purdue University, West Lafayette, IN, 47907, USA.
- Birck Nanotechnology Center, Purdue University, West Lafayette, IN, 47907, USA
| | - Jay S Johnson
- USDA-ARS Livestock Behavior Research Unit, West Lafayette, IN 47907, USA
| | - Mohit Verma
- Birck Nanotechnology Center, Purdue University, West Lafayette, IN, 47907, USA
- Department of Agricultural and Biological Engineering, Purdue University, West Lafayette, IN 47907, USA
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN 47907, USA
| | - Rahim Rahimi
- School of Materials Engineering, Purdue University, West Lafayette, IN, 47907, USA.
- Birck Nanotechnology Center, Purdue University, West Lafayette, IN, 47907, USA
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10
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Jin X, Saha A, Jiang H, Oduncu MR, Yang Q, Sedaghat S, Maize K, Allebach JP, Shakouri A, Glassmaker N, Wei A, Rahimi R, Alam MA. Steady-State and Transient Performance of Ion-Sensitive Electrodes Suitable for Wearable and Implantable Electro-chemical Sensing. IEEE Trans Biomed Eng 2021; 69:96-107. [PMID: 34101580 DOI: 10.1109/tbme.2021.3087444] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Traditional Potentiometric Ion-selective Electrodes (ISE) are widely used in industrial and clinical settings. The simplicity and small footprint of ISE have encouraged their recent adoption as wearable/implantable sensors for personalized healthcare and precision agriculture, creating a new set of unique challenges absent in traditional ISE. In this paper, we develop a fundamental physics-based model to describe both steady-state and transient responses of ISE relevant for wearable/implantable sensors. The model is encapsulated in a generalized Nernst formula that explicitly accounts for the analyte density, time-dynamics of signal transduction, ion-selective membrane thickness, and other sensor parameters. The formula is validated numerically by self-consistent modeling of multispecies ion-transport and experimentally by interpreting the time dynamics and thickness dependence of thin-film solid-contact and graphene-based ISE sensors for measuring soil nitrate concentration. These fundamental results will support the accelerated development of ISE for wearable/implantable applications.
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11
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Sedaghat S, Nicolas V. MRI Follow-up in Recurrent Aggressive Fibromatosis: A Study from a German Sarcoma Center. Semin Musculoskelet Radiol 2019. [DOI: 10.1055/s-0039-1692585] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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12
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Sedaghat S, Ahadian MM, Jafarian M, Hatamie S. Model Fuel Deep Desulfurization Using Modified 3D Graphenic Adsorbents: Isotherm, Kinetic, and Thermodynamic Study. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.9b00250] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sotoudeh Sedaghat
- Institute for Nanoscience and Nanotechnology (INST), Sharif University of Technology, Azadi Avenue, 14588-89694 Tehran, Iran
| | - M. Mahdi Ahadian
- Institute for Nanoscience and Nanotechnology (INST), Sharif University of Technology, Azadi Avenue, 14588-89694 Tehran, Iran
| | - Majid Jafarian
- Faculty of Science, K. N. Toosi University of Technology, Mirdamad Boulevard, 15875-4416 Tehran, Iran
| | - Shadie Hatamie
- Institute for Nanoscience and Nanotechnology (INST), Sharif University of Technology, Azadi Avenue, 14588-89694 Tehran, Iran
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13
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Sedaghat S, Jeong S, Zareei A, Peana S, Glassmaker N, Rahimi R. Development of a nickel oxide/oxyhydroxide-modified printed carbon electrode as an all solid-state sensor for potentiometric phosphate detection. NEW J CHEM 2019. [DOI: 10.1039/c9nj04502c] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This work describes the preparation, characterization and use of a nickel oxide/oxyhydroxide-printed carbon electrode as an efficient potentiometric phosphate sensor.
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Affiliation(s)
- Sotoudeh Sedaghat
- Birck Nanotechnology Center
- Purdue University
- West Lafayette
- USA
- School of Materials Engineering
| | - Sookyoung Jeong
- Birck Nanotechnology Center
- Purdue University
- West Lafayette
- USA
- School of Materials Engineering
| | - Amin Zareei
- Birck Nanotechnology Center
- Purdue University
- West Lafayette
- USA
- School of Materials Engineering
| | - Samuel Peana
- School of Electrical and Computer Engineering
- Purdue University
- West Lafayette
- USA
| | | | - Rahim Rahimi
- Birck Nanotechnology Center
- Purdue University
- West Lafayette
- USA
- School of Materials Engineering
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14
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Varmazyar A, Sedaghat S, Khalaj M. Highly efficient removal of methylene blue by a synthesized TiO2/montmorillonite-albumin nanocomposite: kinetic and isothermal analysis in water. RSC Adv 2017. [DOI: 10.1039/c7ra07096a] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Color removal from industrial effluents, especially in the textile and dyeing industries, is of great interest nowadays.
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Affiliation(s)
- A. Varmazyar
- Department of Chemistry
- Faculty of Science
- Shahr-e-Qods Branch
- Islamic Azad University
- Iran
| | - S. Sedaghat
- Department of Chemistry
- Faculty of Science
- Shahr-e-Qods Branch
- Islamic Azad University
- Iran
| | - M. Khalaj
- Young Researchers and Elite Club
- Buinzahra Branch
- Islamic Azad University
- Buinzahra
- Iran
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15
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Turin TC, Matsushita K, Coresh J, Arima H, Chadban SJ, Cirillo M, Djurdjev O, Green JA, Irie F, Ix JH, Kovesdy CP, Ohkubo T, Shankar A, Wen CP, De Jong PE, Iseki K, Stengel B, Gansevoort RT, De Nicola L, Donfrancesco C, Minutolo R, Iacoviello L, Zoccali C, Gesualdo L, Conte G, Vanuzzo D, Giampaoli S, Gorriz JL, Molina-Vila P, Nieto J, Bover J, Martinez-Castelao A, Martinde Francisco AL, Barril G, Del Pino MD, Escudero V, Coresh J, Matsushita K, Sang Y, Ballew SH, Appel LJ, Green JA, Heine GH, Inker LA, Ishani A, Marks A, Shalev V, Turin TC, Iseki K, Levey AS, Sedaghat S, Mattace-Raso FUS, Uitterlinden AG, Hoorn EJ, Hofman A, Ikram MA, Franco OH, Dehghan A. CKD EPIDEMIOLOGY. Nephrol Dial Transplant 2014. [DOI: 10.1093/ndt/gfu134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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16
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Baena C, Olandoski M, Younge JO, Buitrago-Lopez DA, Darweesh S, Campos N, Sedaghat S, Faria-Neto JR, Chowdhury R, Franco OH. Effects of lifestyle-related interventions on blood pressure in the low and middle income countries: systematic review and meta-analysis. Eur Heart J 2013. [DOI: 10.1093/eurheartj/eht308.p1423] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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17
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Hannawi S, Salmi I, Healy H, Atkins R, Shaw J, Sedaghat S, Sedaghat S, Hoorn E, Van Rooij F, Hofman A, H. Franco O, Witteman J, Dehghan A, Iff S, Germaine W, Webster AC, Wang JJ, Mitchell P, Craig J, Farmer C, Irving J, Hemmelgarn B, Coresh J, Stevens P, Tripepi G, Tripepi G, Leonardis D, Postorino M, Enia G, Zoccali C, Mallamaci F, Worging Group TM, Yonemoto S, Hamano T, Fujii N, Obi Y, Matsui I, Mikami S, Nakano C, Inoue K, Shimomura A, Okada N, Tsubakihara Y, Rakugi H, Isaka Y, Katayama M. Clinical epidemiology and CKD 1-5. Nephrol Dial Transplant 2012. [DOI: 10.1093/ndt/gfs252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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18
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Ghammamy S, Sedaghat S, Sadjadi SAS. Synthesis, characterization, structural analysis and biological activities of new transition metal complexes. Acta Crystallogr A 2011. [DOI: 10.1107/s0108767311090209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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19
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Tirgar Tabari S, Sedaghat S, Naderi H. Oral cavity lesions in patients after chemotherapy. Iran Red Crescent Med J 2011; 13:359-60. [PMID: 22737497 PMCID: PMC3371971] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Download PDF] [Subscribe] [Scholar Register] [Received: 10/12/2010] [Revised: 01/10/2011] [Accepted: 01/20/2011] [Indexed: 11/06/2022]
Affiliation(s)
- S Tirgar Tabari
- Department of Dermatology, Yahya-nejad Hospital, Babol University of Medical Sciences, Babol, Iran,Correspondence: Soudabeh Tirgar Tabari, MD, Assistant Professor of Dermatology, Yahya-nejad Hospital, Babol University of Medical Sciences, Postal code:47136-55647, Babol, Iran. Tel.: +98-911311-3044, Fax: +98-111-2291951, E-mail:
| | - S Sedaghat
- Department of Dermatology, Yahya-nejad Hospital, Babol University of Medical Sciences, Babol, Iran
| | - H Naderi
- Department of Dermatology, Yahya-nejad Hospital, Babol University of Medical Sciences, Babol, Iran
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Mokhtari G, Ghanbari A, Sedaghat S. UP-2.081: Survey on Distribution of Acquired Renal Cysts in Patients With End-Stage Renal Disease Undergoing Hemodialysis in Razi Hospital, Rasht, 2007-2008. Urology 2009. [DOI: 10.1016/j.urology.2009.07.300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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21
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Rustaiyan A, Masoudi S, Monfared A, Kamalinejad M, Lajevardi T, Sedaghat S, Yari M. Volatile constituents of three Thymus species grown wild in Iran. Planta Med 2000; 66:197-198. [PMID: 10763607 DOI: 10.1055/s-0029-1243136] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Affiliation(s)
- A Rustaiyan
- School of Pharmacy, Shaheed Beheshti University of Medical Science, Tehran, Iran.
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Botzenhart K, Heizmann W, Sedaghat S, Heeg P, Hahn T. Bacterial colonization and occurrence of Legionella pneumophila in warm and cold water, in faucet aerators, and in drains of hospitals. Zentralbl Bakteriol Mikrobiol Hyg B Umwelthyg Krankenhaushyg Arbeitshyg Prav Med 1986; 183:79-85. [PMID: 3107260] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Warm and cold water as well as water from wash basin drains and faucet aerators was examined to determine the number of viable and dead bacteria by culture and by staining and to establish the spectrum of species with special consideration of Legionella pneumophila. The relation between the number of Legionella pneumophila, the temperature, and the iron content of the water was determined in three separate warm water systems. High colony counts (up to 8.9 X 10(5) colony-forming units), were detected in both warm and cold water at certain sampling sites. The most prevalent genera were Pseudomonas, Bacillus, Flavobacterium, Acinetobacter, and Moraxella. Legionella pneumophila was found in every building in 35 of 150 warm samples and in 1 of 43 cold water samples. The highest water temperature of a sample containing Legionella pneumophila was 64 degrees C. The correlation between high colony counts and the occurrence of Legionella pneumophila in the samples was not significant. High iron concentrations, however, appear to have a positive effect on the growth of Legionella pneumophila.
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