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Near-infrared spectroscopy

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https://www.readbyqxmd.com/read/29783149/potential-of-near-infrared-spectroscopy-for-quality-evaluation-of-cattle-leather
#1
Carlos Eduardo M Braz, Manuel Antonio C Jacinto, Edenir R Pereira-Filho, Gilberto B Souza, Ana Rita A Nogueira
Models using near-infrared spectroscopy (NIRS) were constructed based on physical-mechanical tests to determine the quality of cattle leather. The following official parameters were used, considering the industry requirements: tensile strength (TS), percentage elongation (%E), tear strength (TT), and double hole tear strength (DHS). Classification models were constructed with the use of k-nearest neighbor (kNN), soft independent modeling of class analogy (SIMCA), and partial least squares-discriminant analysis (PLS-DA)...
May 9, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29782968/trainability-of-hemodynamic-parameters-a-near-infrared-spectroscopy-based-neurofeedback-study
#2
Silvia Erika Kober, Vanessa Hinterleitner, Günther Bauernfeind, Christa Neuper, Guilherme Wood
We investigated the trainability of the hemodynamic response as assessed with near-infrared spectroscopy (NIRS) during one neurofeedback (NF) session. Forty-eight participants were randomly assigned to four different groups that tried to either increase or decrease oxygenated (oxy-Hb) or deoxygenated hemoglobin (deoxy-Hb) over the inferior frontal gyrus during imagery of swallowing movements. Deoxy-Hb could be successfully up-regulated while oxy-Hb could be successfully down-regulated during NF. Participants were not able to down-regulate deoxy-Hb or to up-regulate oxy-Hb...
May 18, 2018: Biological Psychology
https://www.readbyqxmd.com/read/29782388/glasgow-coma-scale-score-fluctuations-are-inversely-associated-with-a-nirs-based-index-of-cerebral-autoregulation-in-acutely-comatose-patients
#3
Ryan J Healy, Andres Zorrilla-Vaca, Wendy Ziai, Marek A Mirski, Charles W Hogue, Romergryko Geocadin, Batya Radzik, Caitlin Palmisano, Lucia Rivera-Lara
BACKGROUND: The Glasgow Coma Scale (GCS) is an essential coma scale in critical care for determining the neurological status of patients and for estimating their long-term prognosis. Similarly, cerebral autoregulation (CA) monitoring has shown to be an accurate technique for predicting clinical outcomes. However, little is known about the relationship between CA measurements and GCS scores among neurological critically ill patients. This study aimed to explore the association between noninvasive CA multimodal monitoring measurements and GCS scores...
May 18, 2018: Journal of Neurosurgical Anesthesiology
https://www.readbyqxmd.com/read/29780199/the-tuning-of-the-plasmon-resonance-of-the-metal-nanoparticles-in-terms-of-the-sers-effect
#4
Z Starowicz, R Wojnarowska-Nowak, P Ozga, E M Sheregii
The Surface-enhanced Raman spectroscopy is the essential tool for various levels of the molecular studies. In order to become widely used as a fast analytical tool, the enhancing structures such as the nanoparticles have to be simple, inexpensive, and offer good flexibility in enhancing properties and the spectral range. In this paper, we investigated the plasmonic properties of the metal nanoparticles, to which the molecules of interest can be adsorbed, forming the bionanocomplexes. Here, for the first time, we provided the collection of the results gathered in one article, which can serve as the basis or guidance for designing the SERS studies on different bionanocomplexes, various nanoparticle structures, sizes, and excitation wavelengths...
2018: Colloid and Polymer Science
https://www.readbyqxmd.com/read/29779378/bandgap-engineering-of-graphene-nanoribbons-by-control-over-structural-distortion
#5
Yunbin Hu, Peng Xie, Marzio De Corato, Alice Ruini, Shen Zhao, Felix Meggendorfer, Lasse Arnt Straasø, Loic Rondin, Patrick Simon, Juan Li, Jonathan J Finley, Michael Ryan Hansen, Jean-Sébastien Lauret, Elisa Molinari, Xinliang Feng, Johannes V Barth, Carlos-Andres Palma, Deborah Prezzi, Klaus Müllen, Akimitsu Narita
Amongst organic electronic materials, graphene nanoribbons (GNRs) offer extraordinary versatility as next-generation semiconducting materials for nanoelectronics and optoelectronics due to their tunable properties, including charge-carrier mobility, optical absorption and electronic bandgap, which are uniquely defined by their chemical structures. Although planar GNRs have been predominantly considered until now, non-planarity can be an additional parameter to modulate their property without changing the aromatic core...
May 19, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29778711/atr-ir-study-of-skin-components-lipids-proteins-and-water-part-ii-near-infrared-radiation-effect
#6
S Olsztyńska-Janus, Z Kiełbowicz, M A Czarnecki
Near infrared (NIR) radiation has been widely used in medicine and biomedical engineering. In spite of numerous studies the molecular mechanism of NIR radiation on biological systems has not been established as yet. The objective of this work was examination of the effect of NIR irradiation on the skin components. Modifications of lipid organization after NIR exposure vs. temperature (from 20 to 90 °C) have been investigated using Attenuated Total Reflectance Infrared (ATR-IR) spectroscopy. This work is a continuation of our previous studies on the temperature effect on skin components [1]...
May 11, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29778477/the-effects-of-microfluidization-on-the-physical-microbial-chemical-and-coagulation-properties-of-milk
#7
A J Bucci, D L Van Hekken, M H Tunick, J A Renye, P M Tomasula
This work examines the use of mild heat treatments in conjunction with 2-pass microfluidization to generate cheese milk for potential use in soft cheeses, such as Queso Fresco. Raw, thermized, and high temperature, short time pasteurized milk samples, standardized to the 3% (wt/wt) fat content used in cheesemaking, were processed at 4 inlet temperature and pressure conditions: 42°C/75 MPa, 42°C/125 MPa, 54°C/125 MPa, and 54°C/170 MPa. Processing-induced changes in the physical, chemical, and microbial properties resulting from the intense pressure, shear, and cavitation that milk experiences as it is microfluidized were compared with nonmicrofluidized controls...
May 16, 2018: Journal of Dairy Science
https://www.readbyqxmd.com/read/29777826/quantifying-fast-optical-signal-and-event-related-potential-relationships-during-a-visual-oddball-task
#8
Nicole Proulx, Ali-Akbar Samadani, Tom Chau
Event-related potentials (ERPs) have previously been used to confirm the existence of the fast optical signal (FOS) but validation methods have mainly been limited to exploring the temporal correspondence of FOS peaks to those of ERPs. The purpose of this study was to systematically quantify the relationship between FOS and ERP responses to a visual oddball task in both time and frequency domains. Near-infrared spectroscopy (NIRS) and electroencephalography (EEG) sensors were co-located over the prefrontal cortex while participants performed a visual oddball task...
May 16, 2018: NeuroImage
https://www.readbyqxmd.com/read/29776539/near-infrared-emission-spectroscopy-for-rapid-compositional-analysis-of-portland-cements
#9
Jicarla Portela Rebouças, Jarbas José Rodrigues Rohwedder, Celio Pasquini
Near infrared emission spectroscopy (NIRES) has been investigated to yield a new analytical method for determination of CaO, SiO2 , Al2 O3 , Fe2 O3 , MgO, and SO3 in Portland cement samples. The analyses were accomplished by correlation of the second derivative NIRES spectra with reference elemental analyses made by X-ray Fluorescence (XRF), using Partial Least Square (PLS) regression models. Four different types of cements (type II, III, IV and V) were included in the models. The results show RMSEP from 0...
September 18, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29775114/oxygen-dependency-of-mitochondrial-metabolism-indicates-outcome-of-newborn-brain-injury
#10
Gemma Bale, Subhabrata Mitra, Isabel de Roever, Magdalena Sokolska, David Price, Alan Bainbridge, Roxana Gunny, Cristina Uria-Avellanal, Giles S Kendall, Judith Meek, Nicola J Robertson, Ilias Tachtsidis
There is a need for a method of real-time assessment of brain metabolism during neonatal hypoxic-ischaemic encephalopathy (HIE). We have used broadband near-infrared spectroscopy (NIRS) to monitor cerebral oxygenation and metabolic changes in 50 neonates with HIE undergoing therapeutic hypothermia treatment. In 24 neonates, 54 episodes of spontaneous decreases in peripheral oxygen saturation (desaturations) were recorded between 6 and 81 h after birth. We observed differences in the cerebral metabolic responses to these episodes that were related to the predicted outcome of the injury, as determined by subsequent magnetic resonance spectroscopy derived lactate/N-acetyl-aspartate...
January 1, 2018: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/29774621/increase-of-frontal-cerebral-blood-volume-during-transcranial-magnetic-stimulation-in-depression-is-related-to-treatment-effectiveness-a-pilot-study-with-near-infrared-spectroscopy
#11
Toshikazu Shinba, Nobutoshi Kariya, Saori Matsuda, Hanae Matsuda, Yusuke Obara
AIM: Alterations of cerebral blood flow have been reported in studies of depression treated by transcranial magnetic stimulation (TMS). However, the relationship between these changes in activity during stimulation and the effectiveness of TMS is not known. The aim of this study was to determine whether changes in frontal cerebral blood volume measured as frontal hemoglobin concentration (fHbC) during TMS are correlated with clinical outcomes of treatment. METHODS: Fifteen drug-resistant patients with depression underwent a standard treatment regimen of TMS to the left dorsolateral prefrontal cortex...
May 18, 2018: Psychiatry and Clinical Neurosciences
https://www.readbyqxmd.com/read/29772900/pyrene-fused-s-indacene
#12
Jason Melidonie, Junzhi Liu, Yubin Fu, Jan J Weigand, Reinhard Berger, Xinliang Feng
One antiaromatic polycyclic hydrocarbon (PH) with and without solubilizing tert-butyl substituents, namely s-indaceno[2,1- a:6,5- a']dipyrene (IDPs), has been synthesized by a four-step protocol. The IDPs represent the longitudinal, peri-extension of the indeno[1,2- b]fluorene skeleton towards a planar 40 π-electron system. Their structures were unambiguously confirmed by X-ray crystallographic analysis. The optoelectronic properties were studied by UV/Vis absorption spectroscopy and cyclic voltammetry. These studies revealed that peri-fusion renders the IDP derivatives with a narrow optical energy gap of 1...
May 18, 2018: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/29771819/sharing-as-a-model-for-understanding-division
#13
Alexa Ellis, Xiaosu Hu, Craig E Smith, Pamela E Davis-Kean, Ioulia Kovelman
Emerging research suggests that children's ability to divide is the best predictor of later arithmetic development. Although division is typically taught around grade 3, children much younger than this practice division when sharing and allocating resources (e.g. sharing food). To test the hypothesis that social sharing abilities are linked to the emergence of complex numerical division abilities, we examined sharing and division abilities in adults and children. The first study used functional near infrared spectroscopy to examine the neurocognitive bases of division in adults (N=28; age range: 18-23 years) during a task that evaluated their judgment of proportions in the context of sharing, as well as traditional numerical division tasks...
May 16, 2018: Neuroreport
https://www.readbyqxmd.com/read/29767210/low-threshold-lasing-from-colloidal-cdse-cdsete-core-alloyed-crown-type-ii-heteronanoplatelets
#14
Yuan Gao, Mingjie Li, Savas Delikanli, Haiyang Zheng, Baiquan Liu, Cuong Dang, Tze Chien Sum, Hilmi Volkan Demir
Colloidal type-II heterostructures are believed to be a promising solution-processed gain medium given their spatially separated electrons and holes for the suppression of Auger recombination and their wider emission tuning range from the visible to near-infrared region. Amplified spontaneous emission (ASE) was achieved from colloidal type-II core/shell nanocrystals several years ago. However, due to the limited charge-transfer (CT) interfacial states and minimal overlap of electron and hole wave functions, the ASE threshold has still been very high...
May 16, 2018: Nanoscale
https://www.readbyqxmd.com/read/29766685/test-retest-reliability-of-brain-mitochondrial-cytochrome-c-oxidase-assessed-by-functional-near-infrared-spectroscopy
#15
Lisa Holper, J John Mann
Functional near-infrared spectroscopy (fNIRS) is a noninvasive method for measuring in vivo both hemodynamic and mitochondrial metabolic activities in brain cortical structures. Although the test-retest reliability of the hemodynamic measures, such as reflected by oxygenated (HbO2), deoxygenated (HHb) hemoglobin, and the tissue oxygenation index (TOI), has been previously reported to be good to excellent, the reliability of the metabolic signal indexed by oxidized cytochrome-c-oxidase (oxCCO) has not been reported...
May 2018: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29766518/pls-ipls-ga-pls-models-for-soluble-solids-content-ph-and-acidity-determination-in-intact-dovyalis-fruit-using-near-infrared-spectroscopy
#16
Mateus Wagner Dantas de Assis, Deborah Oliveira De Fusco, Rosangela Câmara Costa, Kássio Michell Gomes de Lima, Luis Carlos Cunha Júnior, Gustavo Henrique de Almeida Teixeira
BACKGROUND: Dovyalis species Dovyalis abyssinica Warb. and Dovyalis hebecarpa Warb. were introduced in Brazil, but the fruit quality of these species are not appropriate for fresh consumption due to the high titratable acidity (TA) and low soluble solids content (SSC). With the selection of new D. abyssinica clones with lower acidity and the hybridization of these two dovyalis specie (D. abyssinica and D. hebecarpa) the fruit quality improved and the better physical-chemical characteristics make them more suitable for fresh consumption...
May 16, 2018: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/29763789/quantification-of-anomeric-structural-changes-of-glucose-solutions-using-near-infrared-spectra
#17
Sae Tanaka, Dušan Kojić, Roumiana Tsenkova, Masato Yasui
Glucose is the most abundant carbohydrate found in living organisms. It exists as two anomers: α-D-glucose and β-D-glucose, which differ in how the hydroxyl group on the C1 carbon is directed. In solutions, the ratio between α- and β-D-glucose is typically 4:6 but can vary depending on the surrounding ions or temperature. In this study, we obtained near-infrared (NIR) spectra of the glucose anomers based on concentration, and analyzed the spectral difference between each anomer by spectra subtraction and principal component analysis, respectively...
May 6, 2018: Carbohydrate Research
https://www.readbyqxmd.com/read/29763712/cerebral-tissue-oximetry-levels-during-prehospital-management-of-cardiac-arrest-a-prospective-observational-study
#18
Gregor Prosen, Strnad Matej, Stephanie J Doniger, Andrej Markota, Andraž Stožer, Vesna Borovnik-Lesjak, Dušan Mekiš
INTRODUCTION: Near-infrared spectroscopy (NIRS) enables continuous monitoring of regional oximetry (rSO2 ). The aim of this study was to describe dynamics of regional cerebral oximetry levels during out of hospital cardiac arrest (OHCA) resuscitation, specifically around the time of restoration of spontaneous circulation (ROSC). METHODS: This prospective observational study was performed in the prehospital setting during cardio-pulmonary resuscitation (CPR) of OHCA patients...
May 12, 2018: Resuscitation
https://www.readbyqxmd.com/read/29762693/influence-of-feeding-thermally-peroxidized-soybean-oil-to-finishing-barrows-on-processing-characteristics-and-shelf-life-of-commercially-manufactured-bacon
#19
M F Overholt, J E Lowell, G D Kim, D D Boler, B J Kerr, A C Dilger
Objectives were to evaluate effects of feeding soybean oil (SO) with varying levels of peroxidation on fresh belly characteristics, processing yields, and shelf life of commercially manufactured bacon stored under food-service style conditions. Fifty-six barrows were randomly assigned to 1 of 4 diets containing 10% fresh SO (22.5°C) or thermally processed SO (45°C for 288 h, 90°C for 72 h, or 180°C for 6 h), each infused with air at a rate of 15L/min. Individually housed pigs were provided ad libitum access to feed for 81 d...
May 12, 2018: Journal of Animal Science
https://www.readbyqxmd.com/read/29760970/liquid-phantoms-for-near-infrared-and-diffuse-correlation-spectroscopies-with-tunable-optical-and-dynamic-properties
#20
Lorenzo Cortese, Giuseppe Lo Presti, Marco Pagliazzi, Davide Contini, Alberto Dalla Mora, Antonio Pifferi, Sanathana Konugolu Venkata Sekar, Lorenzo Spinelli, Paola Taroni, Marta Zanoletti, Udo M Weigel, Sixte de Fraguier, An Nguyen-Dihn, Bogdan Rosinski, Turgut Durduran
We present the recipe and characterization for preparing liquid phantoms that are suitable for both near-infrared spectroscopy and diffuse correlation spectroscopy. The phantoms have well-defined and tunable optical and dynamic properties, and consist of a solution of water and glycerol with fat emulsion as the scattering element. The recipe takes into account the effect of bulk refractive index changes due to the addition of glycerol, which is commonly used to alter the sample viscosity.
May 1, 2018: Biomedical Optics Express
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