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Near infrared spectroscopy

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https://www.readbyqxmd.com/read/29790512/probing-the-interaction-between-solid-benzene-and-water-using-vacuum-ultraviolet-and-infrared-spectroscopy
#1
Anita Dawes, Natalia Pascual, Nigel J Mason, Sabrina Gärtner, Søren V Hoffmann, Nykola C Jones
We present results of a combined vacuum ultraviolet (VUV) and infrared (IR) photoabsorption study of amorphous benzene : water mixtures and layers to investigate the benzene-water interaction in the solid phase. VUV spectra of 1 : 1, 1 : 10 and 1 : 100 benzene : water mixtures at 24 K reveal a concentration dependent shift in the energies of the 1B2u, 1B1u and 1E1u electronic states of benzene. All the electronic bands blueshift from pure amorphous benzene towards gas phase energies with increasing water concentration...
May 23, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29790148/prospective-pilot-study-of-cerebral-near-infrared-spectroscopy-monitoring-during-pre-hospital-anaesthesia
#2
S Ångerman, S Länkimäki, N Neuvonen, H Kirves, J Nurmi
BACKROUND: Near-infrared spectroscopy (NIRS) provides a non-invasive measure of cerebral tissue oxygenation. The literature on application of this method in pre-hospital setting is limited. The aims of this study were to determine the feasibility of cerebral NIRS during pre-hospital anaesthesia and to quantify the changes in front lobe regional oxygen saturation (rSO2 ) during the pre-hospital phase. METHODS: NIRS monitoring (Nonin SenSmart X-100) of front lobe regional oxygen saturation (rSO2) was initiated before induction of anaesthesia in 31 adult patients and continued until hospital arrival...
May 22, 2018: Acta Anaesthesiologica Scandinavica
https://www.readbyqxmd.com/read/29789202/relationship-between-prolonged-neural-suppression-and-cerebral-hemodynamic-dysfunction-during-hypothermia-in-asphyxiated-piglets
#3
Wataru Jinnai, Shinji Nakamura, Kosuke Koyano, Satoshi Yamato, Takayuki Wakabayashi, Yinmon Htun, Yasuhiro Nakao, Takashi Iwase, Makoto Nakamura, Saneyuki Yasuda, Masaki Ueno, Takanori Miki, Takashi Kusaka
OBJECTIVES: Hypothermia (HT) improves the outcome of neonatal hypoxic-ischemic encephalopathy. Here, we investigated changes during HT in cortical electrical activity using amplitude-integrated electroencephalography (aEEG) and in cerebral blood volume (CBV) and cerebral hemoglobin oxygen saturation using near-infrared time-resolved spectroscopy (TRS) and compared the results with those obtained during normothermia (NT) after a hypoxic-ischemic (HI) insult in a piglet model of asphyxia...
May 19, 2018: Brain & Development
https://www.readbyqxmd.com/read/29788845/brain-perfusion-evaluated-by-regional-tissue-oxygenation-as-a-possible-quality-indicator-of-ongoing-cardiopulmonary-resuscitation-an-experimental-porcine-cardiac-arrest-study
#4
Tomáš Bouček, Mikuláš Mlček, Petra Krupičková, Michal Huptych, Tomáš Belza, Otomar Kittnar, Aleš Linhart, Jan Bělohlávek
INTRODUCTION: Relationship between regional tissue oxygenation (rSO2 ) and microcirculatory changes during cardiac arrest (CA) are still unclear. Therefore, we designed an experimental study to correlate rSO2 , microcirculation and systemic hemodynamic parameters in a porcine model of CA. METHODS: Ventricular fibrillation was induced in 24 female pigs (50±3kg) and left for three minutes untreated followed by five minutes of mechanical CPR. Regional and peripheral saturations were assessed by near-infrared spectroscopy, sublingual microcirculation by Sidestream Dark Field technology and continuous hemodynamic parameters, including systemic blood pressure (MAP) and carotid blood flow (CF), during baseline, CA and CPR periods...
May 2018: Perfusion
https://www.readbyqxmd.com/read/29787932/initial-data-on-adsorption-of-cs-and-sr-to-the-surfaces-of-microplastics-with-biofilm
#5
Mathew P Johansen, Emily Prentice, Tom Cresswell, Nick Howell
The adsorption of radiocesium and radiostrontium onto a range of natural materials has been well quantified, but not for the new media of environmental plastics, which may have enhanced adsorption due to surface-weathering and development of biofilms. Microplastic samples were deployed in freshwater, estuarine and marine conditions, then characterised using infrared spectroscopy to document changes to the plastic surface (vs interior). Synchrotron elemental mapping data revealed surfaces that were well-covered by accumulation of reactive water solutes and sulphur, but, in contrast, had highly discrete coverage of elements such as Fe and Ti, indicating adhered mineral/clay-associated agglomerates that may increase overall adsorption capacity...
May 19, 2018: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/29786619/-i-in-situ-i-nap-xps-spectroscopy-during-methane-dry-reforming-on-zro-sub-2-sub-pt-111-inverse-model-catalyst
#6
Christoph Rameshan, Hao Li, Kresimir Anic, Matteo Roiaz, Verena Pramhaas, Raffael Rameshan, Raoul Blume, Michael Hävecker, Jan Knudsen, Axel Knop-Gericke, Gunther Rupprechter
Due to the need of sustainable energy sources, methane dry reforming (MDR) is a useful reaction for the conversion of the greenhouse gases CH<sub>4</sub> and CO<sub>2</sub> to synthesis gas (CO + H<sub>2</sub>). Syngas is the basis for a wide range of commodity chemicals and can be utilized for fuel production via Fischer-Tropsch (FT) synthesis. The current study focuses on spectroscopic investigations of the surface and reaction properties of a ZrO<sub>2</sub>/Pt inverse model catalyst, i...
May 22, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29786449/fault-detection-based-on-near-infrared-spectra-for-the-oil-desalting-process
#7
Xiaoli Luan, Minjun Jin, Fei Liu
The fault detection problem of the oil desalting process is investigated in this paper. Different from the traditional fault detection approaches based on measurable process variables, near-infrared (NIR) spectroscopy is applied to acquire the process fault information from the molecular vibrational signal. With the molecular spectra data, principal component analysis was explored to calculate the Hotelling T2 and squared prediction error, which act as fault indicators. Compared with the traditional fault detection approach based on measurable process variables, NIR spectra-based fault detection illustrates more sensitivity to early failure because of the fact that the changes in the molecular level can be identified earlier than the physical appearances on the process...
January 1, 2018: Applied Spectroscopy
https://www.readbyqxmd.com/read/29785898/accuracy-and-application-of-milk-fatty-acid-estimation-with-diffuse-reflectance-near-infrared-spectroscopy
#8
Andreas Melfsen, Max Holstermann, Angelika Haeussermann, Joachim Molkentin, Andreas Susenbeth, Eberhard Hartung
Near infrared spectroscopy (NIRS) has the potential to estimate contents of fatty acids (FA) in milk frequently at-farm or during daily milking routine. In this study, a total of 738 raw milk spectra collected from 33 Holstein cows over a period of 30 weeks were recorded. Reference data on FA composition in milk and in milk fat were analysed in laboratory. Calibration models were calculated for single FA and groups of FA in milk and in milk fat. Validation resulted in sufficient Ratio of Prediction to Deviation (RPD) values for some single FA and in higher RPD values for groups of FA when concentrations of FA in milk were predicted...
May 2018: Journal of Dairy Research
https://www.readbyqxmd.com/read/29784971/normalized-spatial-complexity-analysis-of-neural-signals
#9
Huibin Jia, Yanwei Li, Dongchuan Yu
The spatial complexity of neural signals, which was traditionally quantified by omega complexity, varies inversely with the global functional connectivity level across distinct region-of-interests, thus provides a novel approach in functional connectivity analysis. However, the measures in omega complexity are sensitive to the number of neural time-series. Here, normalized spatial complexity was suggested to overcome the above limitation, and was verified by the functional near-infrared spectroscopy (fNIRS) data from a previous published autism spectrum disorder (ASD) research...
May 21, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29784366/raman-spectroscopy-for-wine-analyses-a-comparison-with-near-and-mid-infrared-spectroscopy
#10
Cláudia A Teixeira Dos Santos, Ricardo N M J Páscoa, Patrícia A L S Porto, António L Cerdeira, J M González-Sáiz, C Pizarro, João A Lopes
Routine wine analysis are commonly employed to ensure the quality and safety standards, and to meet consumers' demands and legal requirements. In the last decades, efforts have been done in order to replace the traditional analytical techniques by vibrational spectroscopic techniques such as near infrared (NIR) and mid infrared (MIR) spectroscopy. The potential of these techniques has already been proved by several studies that revealed their ability for the determination of several wine parameters with high levels of precision and accuracy...
August 15, 2018: Talanta
https://www.readbyqxmd.com/read/29783149/potential-of-near-infrared-spectroscopy-for-quality-evaluation-of-cattle-leather
#11
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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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