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Near-infrared spectroscopy

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https://www.readbyqxmd.com/read/28430499/bc8-silicon-si-iii-is-a-narrow-gap-semiconductor
#1
Haidong Zhang, Hanyu Liu, Kaya Wei, Oleksandr O Kurakevych, Yann Le Godec, Zhenxian Liu, Joshua Martin, Michael Guerrette, George S Nolas, Timothy A Strobel
Large-volume, phase-pure synthesis of BC8 silicon (Ia3[over ¯], cI16) has enabled bulk measurements of optical, electronic, and thermal properties. Unlike previous reports that conclude BC8-Si is semimetallic, we demonstrate that this phase is a direct band gap semiconductor with a very small energy gap and moderate carrier concentration and mobility at room temperature, based on far- and midinfrared optical spectroscopy, temperature-dependent electrical conductivity, Seebeck and heat capacity measurements...
April 7, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28429598/preliminary-clinical-validation-of-a-differential-correction-method-for-improving-measurement-accuracy-in-noninvasive-measurement-of-blood-glucose-using-near-infrared-spectroscopy
#2
Guang Han, Xuyao Yu, Dandan Xia, Rong Liu, Jin Liu, Kexin Xu
One of the main challenges in the noninvasive sensing of blood glucose by near-infrared (NIR) spectroscopy is the background variations from light source drift, sweating, and temperature change at the human-machine interface. In this paper, a differential correction method based on the spectra from the floating-reference position and measuring position is proposed to eliminate these spectral variations from background interferences. Its effectiveness was validated by in vitro and in vivo experiments in which the diffuse reflectance of intralipid solutions and human skin was collected at the source distances of 0...
January 1, 2017: Applied Spectroscopy
https://www.readbyqxmd.com/read/28429193/effect-of-non-coherent-infrared-light-led-%C3%AE-945%C3%A2-%C3%A2-%C3%A2-20%C3%A2-nm-on-bone-repair-in-diabetic-rats-morphometric-and-spectral-analyses
#3
Alexandre Greca Diamantino, Renata Amadei Nicolau, Davidson Ribeiro Costa, Alessandra Paes de Barros Almeida, Danila Xênia de Miranda Mato, Marco Antonio de Oliveira, Ana Maria do Espírito Santo
Phototherapy using coherent light (lasers) and non-coherent light (light-emitting diodes (LEDs)) has been investigated for the purpose of biomodulation in biological tissues. Several effects can be expected, including pain moderation, biostimulation of cellular tropism, anti-inflammatory effects, regular circulatory stimulation, and tissue repair. The aim of this study was to evaluate the effect of LED (λ945 ± 20 nm, 48 mW) therapy on the regeneration process in femoral lesions of rats (Wistar). Seven irradiation sessions were held, with a 48-h interval between sessions...
April 20, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28428520/-prevention-of-spinal-cord-ischemia-during-thoracic-endovascular-aortic-repair
#4
Shinya Takahashi, Taijiro Sueda
Spinal cord ischemia(SCI) has been devastating complication of endovascular thoracic and thoracoabdominal aortic repair. Spinal cord blood supply arises from not only segmental artery, subclavian artery, hypogastric artery and these branches, but also perivertebral vasculature and paravertebral muscle and small arterial network, and risk factors of SCI were multifactorial. There are several adjuncts/strategies which are utilized to minimize the incidence of SCI: cerebrospinal fluid drainage, perioperative management of high mean arterial pressure, intraoperative evoked potential monitoring, and staged thoracoabdominal aortic repair...
April 2017: Kyobu Geka. the Japanese Journal of Thoracic Surgery
https://www.readbyqxmd.com/read/28427056/blood-pressure-during-the-immediate-neonatal-transition-is-the-mean-arterial-blood-pressure-relevant-for-the-cerebral-regional-oxygenation
#5
Nariae Baik, Berndt Urlesberger, Bernhard Schwaberger, Alexander Avian, Lukas Mileder, Georg M Schmölzer, Gerhard Pichler
BACKGROUND: Measurement of mean arterial blood pressure (MABP) is feasible during neonatal transition. OBJECTIVE: The objective of this study was to investigate a potential influence of MABP on the cerebral regional oxygen saturation (crSO2) in preterm and term infants during the immediate neonatal transition. MATERIALS AND METHODS: Preterm and term infants were included in this observational study. The crSO2 was measured by near-infrared spectroscopy with the INVOS 5100C (Somanetics Corp...
April 21, 2017: Neonatology
https://www.readbyqxmd.com/read/28426088/nanoscale-imaging-and-spectroscopy-of-band-gap-and-defects-in-polycrystalline-photovoltaic-devices
#6
Yohan Yoon, Jungseok Chae, Aaron M Katzenmeyer, Heayoung P Yoon, Joshua Schumacher, Sangmin An, Andrea Centrone, Nikolai Zhitenev
Improving the power conversion efficiency of photovoltaic (PV) devices is challenging because the generation, separation and collection of electron-hole pairs are strongly dependent on details of the nanoscale chemical composition and defects which are often poorly known. In this work, two novel scanning probe nano-spectroscopy techniques, direct-transmission near-field scanning optical microscopy (dt-NSOM) and photothermal induced resonance (PTIR), are implemented to probe the distribution of defects and the bandgap variation in thin lamellae extracted from polycrystalline CdTe PV devices...
April 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/28424855/analysis-of-multiple-soybean-phytonutrients-by-near-infrared-reflectance-spectroscopy
#7
Gaoyang Zhang, Penghui Li, Wenfei Zhang, Jian Zhao
Improvement of the nutritional quality of soybean is usually facilitated by a vast range of soybean germplasm with enough information about their multiple phytonutrients. In order to acquire this essential information from a huge number of soybean samples, a rapid analytic method is urgently required. Here, a nondestructive near-infrared reflectance spectroscopy (NIRS) method was developed for rapid and accurate measurement of 25 nutritional components in soybean simultaneously, including fatty acids palmitic acid, stearic acid, oleic acid, linoleic acid, and linolenic acid, vitamin E (VE), α-VE, γ-VE, δ-VE, saponins, isoflavonoids, and flavonoids...
April 19, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28424602/assessing-the-driver-s-current-level-of-working-memory-load-with-high-density-functional-near-infrared-spectroscopy-a-realistic-driving-simulator-study
#8
Anirudh Unni, Klas Ihme, Meike Jipp, Jochem W Rieger
Cognitive overload or underload results in a decrease in human performance which may result in fatal incidents while driving. We envision that driver assistive systems which adapt their functionality to the driver's cognitive state could be a promising approach to reduce road accidents due to human errors. This research attempts to predict variations of cognitive working memory load levels in a natural driving scenario with multiple parallel tasks and to reveal predictive brain areas. We used a modified version of the n-back task to induce five different working memory load levels (from 0-back up to 4-back) forcing the participants to continuously update, memorize, and recall the previous 'n' speed sequences and adjust their speed accordingly while they drove for approximately 60 min on a highway with concurrent traffic in a virtual reality driving simulator...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28422138/abnormal-resting-state-functional-connectivity-in-the-orbitofrontal-cortex-of-heroin-users-and-its-relationship-with-anxiety-a-pilot-fnirs-study
#9
Hada Fong-Ha Ieong, Zhen Yuan
Drug addiction is widely linked to the orbitofrontal cortex (OFC), which is essential for regulating reward-related behaviors, emotional responses, and anxiety. Over the past two decades, neuroimaging has provided significant contributions revealing functional and structural alternations in the brains of drug addicts. However, the underlying neural mechanism in the OFC and its correlates with drug addiction and anxiety still require further elucidation. We first presented a pilot investigation to examine local networks in OFC regions through resting-state functional connectivity (rsFC) using functional near-infrared spectroscopy (fNIRS) from eight abstinent addicts in a heroin-dependent group (HD) and seven subjects in a control group (CG)...
April 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28421756/reactions-of-copper-and-silver-cations-with-carbon-dioxide-an-infrared-photodissociation-spectroscopic-and-theoretical-study
#10
Zhi Zhao, Xiangtao Kong, Dong Yang, Qinqin Yuan, Hua Xie, Hongjun Fan, Jijun Zhao, Ling Jiang
The reaction of copper and silver cations with carbon dioxide was studied by mass-selected infrared photodissociation spectroscopy. Quantum chemical calculations were performed on these products, which aided the experimental assignments of the infrared spectra and helped to elucidate the geometrical and electronic structures. The Cu(+) and Ag(+) cations bind to an oxygen atom of CO2 in an end-on configuration via a charge-quadrupole electrostatic interaction in the [M(CO2)n](+) complexes. The formation of oxide-carbonyl and carbonyl-carbonate structures is not favored for the interaction of CO2 with Cu(+) and Ag(+)...
April 21, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28421173/cerebral-autoregulation-brain-injury-and-the-transitioning-premature-infant
#11
REVIEW
Zachary A Vesoulis, Amit M Mathur
Improvements in clinical management of the preterm infant have reduced the rates of the two most common forms of brain injury, such as severe intraventricular hemorrhage and white matter injury, both of which are contributory factors in the development of cerebral palsy. Nonetheless, they remain a persistent challenge and are associated with a significant increase in the risk of adverse neurodevelopment outcomes. Repeated episodes of ischemia-reperfusion represent a common pathway for both forms of injury, arising from discordance between systemic blood flow and the innate regulation of cerebral blood flow in the germinal matrix and periventricular white matter...
2017: Frontiers in Pediatrics
https://www.readbyqxmd.com/read/28420824/dynamic-changes-in-near-infrared-spectroscopy-nirs-findings-in-first-episode-schizophrenia-a-case-report
#12
Tsuyoshi Hatakeyama, Yasuto Kunii, Itaru Miura, Shuntaro Itagaki, Soichi Kono, Tetsuya Shiga, Sachie Oshima, Keiko Nozaki, Rieko Suzuki, Hirooki Yabe
The clinical course of schizophrenia is characterized by recurrence and chronicity and has a large burden on society. Nevertheless, diagnosis of schizophrenia is based only on distinctive symptoms and the disease course. Near-infrared spectroscopy (NIRS) is a useful method for measuring changes in the hemoglobin concentration in the cortical surface area and reflects brain function. We measured NIRS four times during the clinical course in a patient with first-episode schizophrenia.A 17-year-old woman admitted to our hospital because of hallucinations, delusions and appetite loss...
April 15, 2017: Fukushima Journal of Medical Science
https://www.readbyqxmd.com/read/28420129/hand-motion-detection-in-fnirs-neuroimaging-data
#13
Mohammadreza Abtahi, Amir Mohammad Amiri, Dennis Byrd, Kunal Mankodiya
As the number of people diagnosed with movement disorders is increasing, it becomes vital to design techniques that allow the better understanding of human brain in naturalistic settings. There are many brain imaging methods such as fMRI, SPECT, and MEG that provide the functional information of the brain. However, these techniques have some limitations including immobility, cost, and motion artifacts. One of the most emerging portable brain scanners available today is functional near-infrared spectroscopy (fNIRS)...
April 15, 2017: Healthcare (Basel, Switzerland)
https://www.readbyqxmd.com/read/28419616/the-provision-of-pediatric-cardiac-anesthesia-services-in-germany-current-status-of-structural-and-personnel-organization
#14
Torsten Baehner, Oliver Dewald, Ingo Heinze, Matthias Mueller, Ehrenfried Schindler, Uwe Schirmer, Georg Baumgarten, Andreas Hoeft, Richard K Ellerkmann
BACKGROUND: Anesthesia for pediatric cardiac surgery requires a high level of expert knowledge. There are currently no recommendations and standards for anesthetic management for congenital cardiac surgery in Germany. AIM: The aim of the present study was to assess the current status of structural and personnel anesthetic standards at pediatric cardiac surgery centers in Germany. METHOD: All cardiac surgical centers in Germany were reviewed for an active program for congenital heart surgery...
April 17, 2017: Paediatric Anaesthesia
https://www.readbyqxmd.com/read/28419082/diffuse-optical-tomography-to-investigate-the-newborn-brain
#15
REVIEW
Chuen Wai Lee, Robert J Cooper, Topun Austin
Over the past 15 years, functional near-infrared spectroscopy (fNIRS) has emerged as a powerful technology for studying the developing brain. Diffuse Optical Tomography (DOT) is an extension of fNIRS that combines hemodynamic information from dense optical sensor arrays over a wide field of view. Using image reconstruction techniques, DOT can provide images of the hemodynamic correlates to neural function that are comparable to those produced by functional MRI (fMRI). This review article explains the principles of DOT, and highlights the growing literature on the use of DOT in the study of healthy development of the infant brain, and the study of novel pathophysiology in infants with brain injury...
April 18, 2017: Pediatric Research
https://www.readbyqxmd.com/read/28417464/qualitative-and-quantitative-analysis-of-endophyte-alkaloids-in-perennial-ryegrass-using-near-infrared-spectroscopy
#16
Milton C Soto-Barajas, Iñigo Zabalgogeazcoa, Inmaculada González-Martin, Beatriz R Vázquez-de-Aldana
BACKGROUND: Near-infrared reflectance spectroscopy (NIRS) has been widely used in forage quality control because it is faster, cleaner, and less expensive than conventional chemical procedures. In Lolium perenne (perennial ryegrass), one of the most important forage grasses, the infection by asymptomatic Epichloë fungal endophytes alters the plant nutritional quality due to the production of alkaloids. In this research, we developed a rapid method based on NIRS to detect and quantify endophyte alkaloids (peramine, lolitrem B and ergovaline) using a heterogeneous set of L...
April 18, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28414877/accelerated-point-of-muscle-deoxygenation-during-the-20-m-shuttle-run-test
#17
Daisuke Kume, Akira Iguchi, Hiroshi Endoh
This study examined whether the point of accelerated deoxygenation of active muscle occurs during the 20-m shuttle run test (20mSRT) and, if so, whether it is associated with exercise performance in the test. Twenty-nine male subjects performed the 20mSRT, and concentration changes in oxyhaemoglobin (ΔOxy-Hb) and deoxyhaemoglobin (ΔDeoxy-Hb) in the m. vastus lateralis were measured using a portable near-infrared spectroscopy device. The difference between the relative concentration changes in ΔOxy-Hb and ΔDeoxy-Hb (Δ[Oxy-Hb - Deoxy-Hb]) was regarded as the muscle oxygenation index...
April 16, 2017: Clinical Physiology and Functional Imaging
https://www.readbyqxmd.com/read/28414525/influence-of-physical-and-biological-variability-and-solution-methods-in-fruit-and-vegetable-quality-non-destructive-inspection-by-using-imaging-and-near-infrared-spectroscopy-techniques-a-review
#18
Baohua Zhang, Dejian Dai, Jichao Huang, Jun Zhou, Qifa Gui
Over the past decades, imaging and spectroscopy techniques have been rapidly developing and widely applied in non-destructive fruit and vegetable quality assessment. The physical properties (including size, shape, color, position and temperature) and biological properties (including cultivar, season, maturity level and geographical origin) of fruits and vegetables vary from one to another. A great variety of physical and biological properties of agricultural products influence the optical propagation properties and interaction behaviors with incident light, thus decreasing the quality inspection accuracy...
April 17, 2017: Critical Reviews in Food Science and Nutrition
https://www.readbyqxmd.com/read/28414469/correlations-between-structure-and-near-infrared-spectra-of-saturated-and-unsaturated-carboxylic-acids-an-insight-from-anharmonic-dft-calculations
#19
Justyna Grabska, Mika Ishigaki, Krzysztof Bernard Beć, Marek Janusz Wojcik, Yukihiro Ozaki
By near-infrared (NIR) spectroscopy and anharmonic DFT calculations we investigate five kinds of saturated and unsaturated carboxylic acids belonging to the group of short-chain fatty acids; propionic acid, butyric acid, acrylic acid, crotonic acid and vinylacetic acid. The experimental NIR spectra of these five kinds of carboxylic acids are reproduced by quantum chemical calculations in a broad spectral region of 7500-4000 cm(-1) and for a wide range of concentrations. By employing anharmonic GVPT2 calculations on DFT level, a detailed interpretation of experimental spectra is achieved, elucidating structure-spectra correlations of these molecules in the NIR region...
April 17, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28411824/application-of-benchtop-and-portable-near-infrared-spectrometers-for-predicting-the-optimum-harvest-time-of-verbena-officinalis
#20
Cornelia K Pezzei, Stefan A Schönbichler, Christian G Kirchler, Julia Schmelzer, Shah Hussain, Verena A Huck-Pezzei, Michael Popp, Justine Krolitzek, Günther K Bonn, Christian W Huck
This study examined the applicability of near-infrared (NIR) spectroscopy coupled with multivariate data analysis (MVA) to determine the ideal harvest time of Verbena officinalis. NIR analyses were performed non-invasively on the fresh plant material based on the quantification of the key constituents verbenalin and verbascoside. Vibrational spectroscopic measurements were performed applying a conventional NIR benchtop device as well as a laboratory independent handheld NIR spectrometer. A novel high performance liquid chromatography (HPLC) method was applied as a reference method...
July 1, 2017: Talanta
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