5,288 results match your criteria plasma spectra

Improved Automated Quantification Algorithm (AQuA) and Its Application to NMR-Based Metabolomics of EDTA-Containing Plasma.

Anal Chem 2021 Jun 15. Epub 2021 Jun 15.

Department of Molecular Sciences, Swedish University of Agricultural Sciences, 750 07 Uppsala, Sweden.

We have recently presented an Automated Quantification Algorithm (AQuA) and demonstrated its utility for rapid and accurate absolute metabolite quantification in H NMR spectra in which positions and line widths of signals were predicted from a constant metabolite spectral library. The AQuA quantifies based on one preselected signal per metabolite and employs library spectra to model interferences from other metabolite signals. However, for some types of spectra, the interspectral deviations of signal positions and line widths can be pronounced; hence, interferences cannot be modeled using a constant spectral library. Read More

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Ag-Modified ZnO Nanorod Array Fabricated on Polyester Fabric and Its Enhanced Visible-Light Photocatalytic Performance by a Built-in Electric Field and Plasmonic Effect.

ACS Omega 2021 Jun 26;6(22):14078-14089. Epub 2021 May 26.

Department of Physics and Electronic Information Engineering, Minjiang University, Fuzhou 350108, P. R. China.

ZnO nanorod arrays (NRAs) were fabricated on polyester fabrics (PFs) by a two-step method and modified with Ag by magnetron sputtering. The photogenerated charge transport properties of the Ag/ZnO nanorod heterojunctions were studied by a self-made Kelvin probe system and a surface photovoltage (SPV) test system. The measured work functions (WFs) of the deposited Ag and ZnO nanorod are 4. Read More

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UV/Vis photochemistry database: Structure, content and applications.

J Quant Spectrosc Radiat Transf 2020 Sep;253

Chemistry Department, University of Oxford, South Parks Road, Oxford, OX1 3QR, United Kingdom.

The "science-softCon UV/Vis Photochemistry Database" (www.photochemistry.org) is a large and comprehensive collection of EUV-VUV-UV-Vis-NIR spectral data and other photochemical information assembled from published peer-reviewed papers. Read More

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September 2020

A Proteomics-Based Analysis of Blood Biomarkers for the Diagnosis of COPD Acute Exacerbation.

Int J Chron Obstruct Pulmon Dis 2021 1;16:1497-1508. Epub 2021 Jun 1.

Department of Pulmonary and Critical Care Medicine, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.

Purpose: The identification of blood biomarkers to diagnose acute exacerbation of chronic obstructive pulmonary disease (AECOPD) will have clinical utility. Here, we used a proteomics-based approach to identify biomarkers capable of identifying AECOPD.

Patients And Methods: This prospective, single-center pilot study enrolled 12 patients who came to Asan Medical Center (South Korea) via the outpatient clinic or emergency department with symptoms of AECOPD and were follow-up in the outpatient clinic during convalescence between 2015 and 2017. Read More

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Determining bacterial and host contributions to the human salivary metabolome.

J Oral Microbiol 2019 4;11(1):1617014. Epub 2019 Jun 4.

Department of Mucosal and Salivary Biology, Dental Institute, King's College London, London, UK.

Background: Salivary metabolomics is rapidly advancing.

Aim And Methods: To determine the extent to which salivary metabolites reflects host or microbial metabolic activity whole-mouth saliva (WMS), parotid saliva (PS) and plasma collected contemporaneously from healthy volunteers were analysed by H-NMR spectroscopy. Spectra underwent principal component analysis and k-means cluster analysis and metabolite quantification. Read More

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Quantized doping of CdS quantum dots with twelve gold atoms.

Chem Commun (Camb) 2021 Jun 7. Epub 2021 Jun 7.

Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Laboratory of Advanced Materials, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Fudan University, Shanghai 200433, China.

Through a bottom-up strategy, CdS quantum dots (QDs) doped with 12 gold atoms in each nanocrystal (NC) were prepared by cation exchange reactions. The (Au12) dopants inside the CdS matrix were directly observed using Cs-corrected high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) images and quantitatively confirmed using the inductively coupled plasma atomic emission spectroscopy (ICP-AES) data. With a photoluminescence quantum yield (PLQY) of 37. Read More

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Blood plasma resonance Raman spectroscopy combined with multivariate analysis for esophageal cancer detection.

J Biophotonics 2021 Jun 5:e202100010. Epub 2021 Jun 5.

Department of Dermatology and Skin Science, University of British Columbia, Vancouver, British Columbia, Canada.

We herein report a novel, reliable and inexpensive method for detecting esophageal cancer using blood plasma resonance Raman spectroscopy combined with multivariate analysis methods. The blood plasma samples were divided into late stage cancer group (n = 164), early stage cancer group (n = 35) and normal group (n = 135) based on clinical pathological diagnosis. Using a specially designed quartz capillary tube as sample holder, we obtained higher quality resonance Raman spectra of blood plasma than existing method. Read More

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Simple and efficient spectroscopic-based univariate sequential methods for simultaneous quantitative analysis of vandetanib, dasatinib, and sorafenib in pharmaceutical preparations and biological fluids.

Spectrochim Acta A Mol Biomol Spectrosc 2021 Nov 21;260:119987. Epub 2021 May 21.

Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, P.O. Box 2457, Riyadh 11451, Saudi Arabia. Electronic address:

Six sequential spectrophotometric-based univariate methods were developed and validated for the simultaneous estimation of three novel anticancer drugs vandetanib (VAN), dasatinib (DAS), and sorafenib (SOR) in a mixture, without the requirement for separation. These methods are novel, simple, precise, and accurate. Different steps including zero crossing, ratio-based, and/or derivative spectra were utilized to develop these analytical methods, namely, ratio difference spectrophotometric method, constant center method, successive derivative ratio method, isoabsorptive method, mean centering of the ratio spectra method, and derivative ratio spectrum-zero crossing method. Read More

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November 2021

Identification and Validation of Combination Plasma Biomarker of Afamin, Fibronectin and Sex Hormone-Binding Globulin to Predict Pre-eclampsia.

Biol Pharm Bull 2021 ;44(6):804-815

Tohoku Medical Megabank Organization (ToMMo), Tohoku University.

The purpose of the present study was to identify a plasma protein biomarker able to predict pre-eclampsia (PE). Comprehensive quantitative proteomics using mass spectrometry with sequential window acquisition of all theoretical fragment ion spectra (SWATH-MS) was applied to plasma samples of 7 PE and 14 healthy pregnant women (for PE subjects, plasma samples were taken before onset of PE), and 11 proteins were selected as candidates potentially able to differentiate the two groups. Plasmas collected at gestational weeks 14-24 from 36 PE and 120 healthy pregnant women (for PE subjects, plasma samples were taken before onset of PE) were used to conduct selected reaction monitoring quantification analysis, optimize protein combinations and conduct internal validation, which consisted of 30 iterations of 10-fold cross-validation using multivariate logistic regression and receiver operating characteristic (ROC) analysis. Read More

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January 2021

Analysis of Trace Metals in Human Hair by Laser-Induced Breakdown Spectroscopy with a Compact Microchip Laser.

Sensors (Basel) 2021 May 28;21(11). Epub 2021 May 28.

Graduate School of Engineering, Tohoku University, 6-6-05 Aoba, Sendai 980-8579, Japan.

A laser-induced breakdown spectroscopy (LIBS) system using a microchip laser for plasma generation is proposed for in-situ analysis of trace minerals in human hair. The LIBS system is more compact and less expensive than conventional LIBS systems, which use flashlamp-excited Q-switched Nd:YAG lasers. Focusing optics were optimized using a Galilean beam expander to compensate for the low emitted pulse energy of the microchip laser. Read More

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Discovery and Evaluation of Protein Biomarkers as a Signature of Wellness in Late-Stage Cancer Patients in Early Phase Clinical Trials.

Cancers (Basel) 2021 May 18;13(10). Epub 2021 May 18.

Stoller Biomarker Discovery Centre, Faculty of Biology, Medicine and Health, University of Manchester, Manchester M13 9NQ, UK.

TARGET (tumour characterisation to guide experimental targeted therapy) is a cancer precision medicine programme focused on molecular characterisation of patients entering early phase clinical trials. Performance status (PS) measures a patient's ability to perform a variety of activities. However, the quality of present algorithms to assess PS is limited and based on qualitative clinician assessment. Read More

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Charge-Transfer Induced by the Oxygen Vacancy Defects in the Ag/MoO Composite System.

Nanomaterials (Basel) 2021 May 14;11(5). Epub 2021 May 14.

Department of Chemistry, Institute for Molecular Science and Fusion Technology, Kangwon National University, Chunchon 24341, Korea.

In this paper, an Ag/MoO composite system was cosputtered by Ar plasma bombardment on a polystyrene (PS) colloidal microsphere array. The MoO formed by this method contained abundant oxygen vacancy defects, which provided a channel for charge transfer in the system and compensated for the wide band gap of MoO. Various characterization methods strongly demonstrated the existence of oxygen vacancy defects and detected the properties of oxygen vacancies. Read More

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Synthesis of Copper Nitride Layers by the Pulsed Magnetron Sputtering Method Carried out under Various Operating Conditions.

Materials (Basel) 2021 May 20;14(10). Epub 2021 May 20.

Division of Surface Engineering, Faculty of Materials Science and Engineering, Warsaw University of Technology, 00-661 Warsaw, Poland.

Copper nitride shows various properties that depend on the structure of the material and is influenced by the change in technical parameters. In the present work, Cu-N layers were synthesized using the pulsed magnetron sputtering method. The synthesis was performed under different operating conditions: direct current (DC) or alternating current (AC) power supply, and various atmospheres: pure Ar and a mixture of Ar + N. Read More

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Surface-Enhanced Raman Spectroscopy to Characterize Different Fractions of Extracellular Vesicles from Control and Prostate Cancer Patients.

Biomedicines 2021 May 20;9(5). Epub 2021 May 20.

Leibniz Institute of Photonic Technology, Member of Research Alliance "Health Technologies", Albert-Einstein-Straße 9, 07745 Jena, Germany.

Extracellular vesicles (EVs) are membrane-enclosed structures ranging in size from about 60 to 800 nm that are released by the cells into the extracellular space; they have attracted interest as easily available biomarkers for cancer diagnostics. In this study, EVs from plasma of control and prostate cancer patients were fractionated by differential centrifugation at 5000× , 12,000× and 120,000× . The remaining supernatants were purified by ultrafiltration to produce EV-depleted free-circulating (fc) fractions. Read More

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Non-Enzymatic Glucose Biosensor Based on Highly Pure TiO Nanoparticles.

Biosensors (Basel) 2021 May 11;11(5). Epub 2021 May 11.

Department of Chemistry and Research Institute of Basic Sciences, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul 02447, Korea.

This study proposes a non-enzymatic glucose sensor fabricated by synthesizing high-purity TiO nanoparticles in thermal plasma and depositing it directly on a substrate and then depositing chitosan-polypyrrole (CS-PPy) conductive polymer films by electrochemical method. The structural properties of the deposited TiO nanoparticles were analyzed by X-ray diffraction (XRD) and dynamic light scattering (DLS) system. The chemical composition and structural properties of the TiO nanoparticle layer and the conductive polymer films were confirmed by X-ray photoelectron spectroscopy (XPS) spectra and scanning electron microscope (SEM). Read More

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Beyond Nitrogen in the Oxygen Reduction Reaction on Nitrogen-Doped Carbons: A NEXAFS Investigation.

Nanomaterials (Basel) 2021 May 1;11(5). Epub 2021 May 1.

Nano-SAE Research Centre, University of Bucharest, Atomistilor 405, 077125 Magurele, Ilfov, Romania.

Polymer electrolyte membrane fuel cells require cheap and active electrocatalysts to drive the oxygen reduction reaction. Nitrogen-doped carbons have been extensively studied regarding their oxygen reduction reaction. The work at hand looks beyond the nitrogen chemistry and brings to light the role of oxygen. Read More

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Approaching Highly Leaching-Resistant Fire-Retardant Wood by In Situ Polymerization with Melamine Formaldehyde Resin.

ACS Omega 2021 May 6;6(19):12733-12745. Epub 2021 May 6.

Wood Science and Engineering, Department of Engineering Sciences and Mathematics, Luleå University of Technology, Forskargatan 1, SE-931 77 Skellefteå, Sweden.

The objective of the work was to improve the leaching resistance of fire-retardant (FR) modified wood by the incorporation of a thermoset resin. Here, Scots pine ( L.) sapwood was impregnated with melamine formaldehyde (MF) resin and hydrophilic FRs guanyl-urea phosphate/boric acid by a vacuum-pressure treatment. Read More

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Investigations on Crystalline Perfection, Raman Spectra and Optical Characteristics of Transition Metal (Ru) Co-Doped Mg:LiNbO Single Crystals.

ACS Omega 2021 Apr 15;6(16):10807-10815. Epub 2021 Apr 15.

Department of Physics, Jamia Millia Islamia, New Delhi 110025, India.

Congruent lithium niobate single crystals with a Ru:Mg co-dopant have been successfully grown using the Czochralski technique from the melt containing 0.02 mol % Ru with Mg of two varied concentrations (4.0 and 6. Read More

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Data on the arc magmatism developed in the Antarctic Peninsula and Patagonia during the Late Triassic-Jurassic: A compilation of new and previous geochronology, geochemistry and isotopic tracing results.

Data Brief 2021 Jun 20;36:107042. Epub 2021 Apr 20.

Carrera de Geologia, Facultad de Ingenieria, Universidad Andres Bello, 8370106 Santiago, Chile.

We present the results of U-Pb zircon dating conducted using laser ablation-inductively coupled plasma mass spectrometry (LA-ICP-MS), isotopic tracing analyses of Hf in zircon and Sr-Nd in whole-rock and whole-rock major oxides, and trace element abundances of 12 plutonic and volcanic rocks present on the Antarctic Peninsula. The dataset is presented in combination with the results of previous studies conducted in both Patagonia and the Antarctic Peninsula. These results were filtered for concordant Pb-U zircon ages and topology of the Ar/Ar age spectra. Read More

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Flowing atmospheric-pressure afterglow drift tube ion mobility spectrometry.

Anal Chim Acta 2021 Jun 12;1163:338507. Epub 2021 Apr 12.

Department of Chemistry and Biochemistry, Texas Tech University, TX, 79409-1061, Lubbock, USA. Electronic address:

In this work, the flowing atmospheric-pressure afterglow (FAPA) ambient desorption/ionization source has been coupled with stand-alone Drift Tube Ion Mobility Spectrometry (DTIMS) for the first time. A tip repeller electrode, modified to allow higher bias potential still below the Townsend's breakdown, was implemented at the FAPA/DTIMS interface to overcome the opposing potentials and facilitate ion transmission. The effect of the lab-built DTIMS and FAPA's operating conditions (such as plasma voltage, current, gas flow rate, repeller's potential and positioning, FAPA orientation, etc. Read More

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Cu/HZSM-5 Sorbent Treated by NH Plasma for Low-Temperature Simultaneous Adsorption-Oxidation of HS and PH.

ACS Appl Mater Interfaces 2021 Jun 21;13(21):24670-24681. Epub 2021 May 21.

Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, P. R. China.

In this study, an NH plasma-treated Cu/HZSM-5 sorbent was introduced to simultaneously remove HS and PH in low-temperature and low-oxygen environments. The effects of the Cu loading amounts, modification methods, and plasma-treatment conditions on the adsorption-oxidation performance of the sorbents were investigated. From the performance test results, the sorbent treated by NH plasma with the specific energy input (SEI, electrical input energy to the unit volume of gas) value of 1 J·mL (Cu/HZSM-5-[S1]) was identified as having the highest breakthrough capacities of 108. Read More

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First-principles study of the optical and thermoelectric properties of tetragonal-silicene.

Phys Chem Chem Phys 2021 May;23(20):11863-11875

Department of Physics, University of Kalyani, Kalyani-741235, India.

We report the optical and thermoelectric properties of the two-dimensional Dirac material T-silicene (TS) sheet and nanoribbons (NRs) by first-principles calculations. Both the optical and thermoelectric properties of TS can be modified by tailoring the sheet into nanoribbons of different widths and edge geometries. The optical response of the structures is highly anisotropic. Read More

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Investigation on many-body effects in micro-LEDs under ultra-high injection levels.

Opt Express 2021 Apr;29(9):13219-13230

Micro-LEDs can work under an extremely high injection level and are widely used in high-brightness micro-displays and visible light communication. With the increase of carrier concentration, many-body effects gradually become important factors affecting devices' characteristics. Considering the effects of carrier scattering, bandgap renormalization, and Coulomb enhancement (CE), changes in the electroluminescence spectra of micro-LEDs are analyzed as the current density increases from 49. Read More

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Micron-scale phenomena observed in a turbulent laser-produced plasma.

Nat Commun 2021 May 11;12(1):2679. Epub 2021 May 11.

LULI, CNRS, CEA, École Polytechnique, UPMC, Univ Paris 06: Sorbonne Universités, Institut Polytechnique de Paris, F-91128 Palaiseau cedex, France.

Turbulence is ubiquitous in the universe and in fluid dynamics. It influences a wide range of high energy density systems, from inertial confinement fusion to astrophysical-object evolution. Understanding this phenomenon is crucial, however, due to limitations in experimental and numerical methods in plasma systems, a complete description of the turbulent spectrum is still lacking. Read More

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Multi-colour light emission from InGaN nanowires monolithically grown on Si substrate by MBE.

Nanotechnology 2021 May 28;32(33). Epub 2021 May 28.

Alferov University, Saint-Petersburg 194021, Russia.

InGaN nanostructures are among the most promising candidates for visible solid-state lighting and renewable energy sources. To date, there is still a lack of information about the influence of the growth conditions on the physical properties of these nanostructures. Here, we extend the study of InGaN nanowires growth directly on Si substrates by plasma-assisted molecular beam epitaxy. Read More

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Structural and optical characteristics determined by the sputtering deposition conditions of oxide thin films.

Beilstein J Nanotechnol 2021 19;12:354-365. Epub 2021 Apr 19.

National Institute for Laser, Plasma and Radiation Physics, 409 Atomistilor Street, PO Box MG-36, Magurele 077125, Ilfov, Romania.

The influence of film thickness on the structural and optical properties of silicon dioxide (SiO) and zinc oxide (ZnO) thin films deposited by radio frequency magnetron sputtering on quartz substrates was investigated. The deposition conditions were optimized to achieve stoichiometric thin films. The orientation of crystallites, structure, and composition were investigated by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), while the surface topography of the samples was analyzed using scanning electron microscopy (SEM). Read More

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Tunable Infrared Plasmonic Properties of Epitaxial TiMgN(001) Layers.

ACS Appl Mater Interfaces 2021 May 5;13(19):22738-22748. Epub 2021 May 5.

Department of Materials Science and Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180, United States.

Optical transmission and reflection spectra in combination with ellipsometry and transport measurements on epitaxial rocksalt structure TiMgN(001) layers with 0.00 ≤ ≤ 0.49 are employed to explore their potential as refractory infrared plasmonic materials. Read More

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The Effect of DBD Plasma Activation Time on the Dyeability of Woven Polyester Fabric with Disperse Dye.

Polymers (Basel) 2021 Apr 29;13(9). Epub 2021 Apr 29.

School of Textile-Leather and Fashion (STLF)-Hanoi University of Science and Technology (HUST), No. 1, Dai Co Viet, Hai Ba Trung, Hanoi 11615, Vietnam.

This study consists of two parts. In the first, the woven polyester fabric, after washing to remove lubricant oils, was treated with the dielectric barrier discharge (DBD) plasma at the short plasma exposure time (from 15 to 90 s). The effect of the plasma exposure time on the activation of the polyester fabric was assessed by the wicking height of the samples. Read More

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Simultaneous Determination of As, Bi, Sb, Se, Te, Hg, Pb and Sn by Small-Sized Electrothermal Vaporization Capacitively Coupled Plasma Microtorch Optical Emission Spectrometry Using Direct Liquid Microsampling.

Molecules 2021 Apr 30;26(9). Epub 2021 Apr 30.

Faculty of Chemistry and Chemical Engineering, Babes-Bolyai University, Arany Janos 11, 400028 Cluj-Napoca, Romania.

The simultaneous determination of chemical vapor-generating elements involving derivatization is difficult even by inductively coupled plasma optical emission spectrometry or mass spectrometry. This study proposes a new direct liquid microsampling method for the simultaneous determination of As, Bi, Se, Te, Hg, Pb, and Sn, using a fully miniaturized set-up based on electrothermal vaporization capacitively coupled plasma microtorch optical emission spectrometry. The method is cost-effective, free from non-spectral interference, and easy to run by avoiding derivatization. Read More

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The potential of FT-IR spectroscopy for improving healthcare in sepsis - An animal model study.

Photodiagnosis Photodyn Ther 2021 Apr 27;34:102312. Epub 2021 Apr 27.

Universidade de Taubaté. R. dos Operários, 09 - Centro, Taubaté, SP, 12020-340, Brazil; Centro Universitário Braz Cubas. Av. Francisco Rodrigues Filho, 1233 - Vila Mogilar, Mogi das Cruzes, SP, 08773-380, Brazil.

Fourier Transform-Infrared (FT-IR) absorption spectroscopy has been used to investigate pathophysiological changes caused by sepsis. Sepsis has been defined as a potentially fatal organic dysfunction caused by a dysregulated host response to infection and can lead a patient to risk of death. This study used samples consisting of the blood plasma of mice which were induced to sepsis state, compared to a healthy group using FT-IR associated with attenuated total reflectance (ATR) spectroscopy. Read More

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