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Near-infrared spectroscopy

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https://www.readbyqxmd.com/read/28108649/intracellular-oxygen-tension-limits-muscle-contraction-induced-change-in-muscle-oxygen-consumption-under-hypoxic-conditions-during-hb-free-perfusion
#1
Hisashi Takakura, Minoru Ojino, Thomas Jue, Tatsuya Yamada, Yasuro Furuichi, Takeshi Hashimoto, Satoshi Iwase, Kazumi Masuda
Under acute hypoxic conditions, the muscle oxygen uptake (mV˙O2) during exercise is reduced by the restriction in oxygen-supplied volume to the mitochondria within the peripheral tissue. This suggests the existence of a factor restricting the mV˙O2 under hypoxic conditions at the peripheral tissue level. Therefore, this study set out to test the hypothesis that the restriction in mV˙O2 is regulated by the net decrease in intracellular oxygen tension equilibrated with myoglobin oxygen saturation (∆PmbO2) during muscle contraction under hypoxic conditions...
January 2017: Physiological Reports
https://www.readbyqxmd.com/read/28107993/using-multiple-process-analytical-technology-probes-to-monitor-multivitamin-blends-in-a-tableting-feed-frame
#2
Pedro Durão, Clémence Fauteux-Lefebvre, Jean-Maxime Guay, Nicolas Abatzoglou, Ryan Gosselin
As Process Analytical Technology (PAT) implementation grows in the pharmaceutical industry, more studies are being performed to evaluate its suitability in new applications and processes within the manufacturing chain. As the last step in tablet production, the compression stage represents a critical phase that ensures product quality. In-line control put in place at this stage has the potential to detect powder blends that are out of specification limits and, thus, help to improve product quality. The objectives of the present project are to quantify the composition of a commercial 31-component multivitamin powder blend in real time on an industrial feed frame, using 3 different PAT tools: light-induced fluorescence spectroscopy, near infrared spectroscopy and red, green and blue color imaging...
March 1, 2017: Talanta
https://www.readbyqxmd.com/read/28107833/water-can-be-a-probe-for-sensing-glucose-in-aqueous-solutions-by-temperature-dependent-near-infrared-spectra
#3
Xiaoyu Cui, Xiuwei Liu, Xiaoming Yu, Wensheng Cai, Xueguang Shao
Near infrared (NIR) spectra are sensitive to the variation on water structure caused by perturbations, such as temperature and additives. In this work, water was applied as a probe to detect glucose in aqueous glucose solutions and human serum samples. Spectral changes of water were captured from the temperature dependent NIR spectra using multilevel simultaneous component analysis (MSCA). The first and second level model were established to describe the quantitative spectra-temperature relationship (QSTR) and the quantitative spectra-concentration relationship (QSCR), i...
March 8, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28106475/characterization-of-developmental-immature-fiber-im-mutant-and-texas-marker-1-tm-1-cotton-fibers-using-attenuated-total-reflection-fourier-transform-infrared-atr-ft-ir-spectroscopy
#4
Yongliang Liu, Hee-Jin Kim
The immature fiber ( im) mutant is one type of cotton fiber mutant with unique characteristics of non-fluffy cotton bolls. Compared to its near-isogenic wild type Texas Marker-1 (TM-1), im fiber has a thin secondary cell wall and is less mature. In this work, we applied the previously proposed principal component analysis (PCA) and simple algorithms to analyze the attenuated total reflection Fourier transform infrared (ATR FT-IR) spectra of developmental im and TM-1 fibers. The results from these approaches could not effectively and consistently indicate the inherent difference between TM-1 and im fibers at the same developmental stage...
January 1, 2017: Applied Spectroscopy
https://www.readbyqxmd.com/read/28106422/circular-dichroism-in-multiphoton-ionization-of-resonantly-excited-he-ions
#5
M Ilchen, N Douguet, T Mazza, A J Rafipoor, C Callegari, P Finetti, O Plekan, K C Prince, A Demidovich, C Grazioli, L Avaldi, P Bolognesi, M Coreno, M Di Fraia, M Devetta, Y Ovcharenko, S Düsterer, K Ueda, K Bartschat, A N Grum-Grzhimailo, A V Bozhevolnov, A K Kazansky, N M Kabachnik, M Meyer
Intense, circularly polarized extreme-ultraviolet and near-infrared (NIR) laser pulses are combined to double ionize atomic helium via the oriented intermediate He^{+}(3p) resonance state. Applying angle-resolved electron spectroscopy, we find a large photon helicity dependence of the spectrum and the angular distribution of the electrons ejected from the resonance by NIR multiphoton absorption. The measured circular dichroism is unexpectedly found to vary strongly as a function of the NIR intensity. The experimental data are well described by theoretical modeling and possible mechanisms are discussed...
January 6, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28104413/cognitive-motor-dual-task-interference-a-systematic-review-of-neural-correlates
#6
REVIEW
Leone Carmela, Peter Feys, Lousin Moumdjian, Emanuele D'Amico, Mario Zappia, Patti Francesco
Cognitive-motor interference refers to dual-tasking (DT) interference (DTi) occurring when the simultaneous performance of a cognitive and a motor task leads to a percentage change in one or both tasks. Several theories exist to explain DTi in humans: the capacity-sharing, the bottleneck and the cross-talk theories. Numerous studies investigating whether a specific brain locus is associated with cognitive-motor DTi have been conducted, but not systematically reviewed. We aimed to review the evidences on brain activity associated with the cognitive-motor DT, in order to better understand the neurological basis of the CMi...
January 16, 2017: Neuroscience and Biobehavioral Reviews
https://www.readbyqxmd.com/read/28102856/the-impact-of-integrated-evaluation-of-hemodynamics-using-targeted-neonatal-echocardiography-with-indices-of-tissue-oxygenation-a-new-approach
#7
Y N Elsayed, R Amer, M M Seshia
OBJECTIVE: To study the impact of integrated evaluation of hemodynamics (IEH) using targeted neonatal echocardiography, together with regional tissue oxygenation, fractional oxygen extraction using near-infrared spectroscopy on the management of infants with compromised hemodynamics. STUDY DESIGN: Retrospective cohort comparison of two groups of infants with compromised hemodynamics. EPOCH 1: did not undergo IEH (January 2012 to March 2014); EPOCH 2: underwent IEH (April 2014 to December 2015)...
January 19, 2017: Journal of Perinatology: Official Journal of the California Perinatal Association
https://www.readbyqxmd.com/read/28101695/the-spatial-release-of-cognitive-load-in-cocktail-party-is-determined-by-the-relative-levels-of-the-talkers
#8
Guillaume Andéol, Clara Suied, Sébastien Scannella, Frédéric Dehais
In a multi-talker situation, spatial separation between talkers reduces cognitive processing load: this is the "spatial release of cognitive load". The present study investigated the role played by the relative levels of the talkers on this spatial release of cognitive load. During the experiment, participants had to report the speech emitted by a target talker in the presence of a concurrent masker talker. The spatial separation (0° and 120° angular distance in azimuth) and the relative levels of the talkers (adverse, intermediate, and favorable target-to-masker ratio) were manipulated...
January 18, 2017: Journal of the Association for Research in Otolaryngology: JARO
https://www.readbyqxmd.com/read/28101424/detection-and-classification-of-three-class-initial-dips-from-prefrontal-cortex
#9
Amad Zafar, Keum-Shik Hong
In this paper, the use of initial dips using functional near-infrared spectroscopy (fNIRS) for brain-computer interface (BCI) is investigated. Features and window sizes for detecting initial dips are also discussed. Three mental tasks including mental arithmetic, mental counting, and puzzle solving are performed in obtaining fNIRS signals from the prefrontal cortex. Vector-based phase analysis method combined with a threshold circle, as a decision criterion, are used to detect the initial dips. Eight healthy subjects participate in experiment...
January 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28101413/significant-and-sustaining-elevation-of-blood-oxygen-induced-by-chinese-cupping-therapy-as-assessed-by-near-infrared-spectroscopy
#10
Ting Li, Yaoxian Li, Yu Lin, Kai Li
Cupping therapy has been used in traditional Chinese medicine for thousands of years to relieve muscle pain/tendency/fatigue and to cure or reduce symbols of other diseases. However, its therapeutic effect is sparsely interpreted in the language of modern physiology. To objectively evaluate its therapeutic effect, we focused on dry cupping treatment and utilized near-infrared spectroscopy (NIRS) to assess the concentration change in oxy-hemoglobin ([HbO2]), deoxy-hemoglobin ([Hb]), and blood volume in the course of cupping therapy over 13 volunteers on the infraspinatus muscle, where is usually applied for shoulder pains...
January 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28101151/effect-of-general-anesthesia-on-serum-%C3%AE-amyloid-protein-and-regional-cerebral-oxygen-saturation-of-elderly-patients-after-subtotal-gastrectomy
#11
Peng Yu, Hua Wang, Lei Mu, Xuemei Ding, Wei Ding
The aim of the present study was to investigate the influence of general anesthesia on serum β-amyloid protein (Aβ) and regional cerebral oxygen saturation (rSO2) of elderly patients after subtotal gastrectomy. From June, 2014 to December, 2015, among 168 patients undergoing subtotal gastrectomy, the Mini-Mental State Examination and Montreal Cognitive Assessment was administered the day prior to surgery and the second and ninth days after the operation. In addition, we administered the tests to 168 healthy adult volunteers (healthy controls) who were treated in our hospital medical center in the same period...
December 2016: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28099981/use-of-esophageal-hemoximetry-to-assess-the-effect-of-packed-red-blood-cell-transfusion-on-gastrointestinal-oxygenation-in-newborn-infants
#12
Farha M Vora, Judy Gates, Kimberley Gerard, Shawn Hanson, Richard L Applegate, Arlin B Blood
Objectives There are no widely accepted methods of continuously monitoring gut oxygenation in the newborn during packed red blood cell transfusion. We investigated the use of an orally inserted light spectroscopy probe to measure lower esophageal oxyhemoglobin saturations (eStO2) before, during, and after transfusion and made comparisons with abdominal near-infrared spectroscopy (NIRS) and superior mesenteric artery (SMA) flow. Study Design Thirteen neonates with corrected gestational ages ranging from 22 weeks, 0 day to 37 weeks, 5 days were enrolled...
January 18, 2017: American Journal of Perinatology
https://www.readbyqxmd.com/read/28099808/dynamics-in-a-room-temperature-ionic-liquid-from-the-cation-perspective-2d-ir-vibrational-echo-spectroscopy
#13
Steven A Yamada, Heather E Bailey, Amr Tamimi, Chunya Li, Michael D Fayer
The dynamics of the room temperature ionic liquid (RTIL) 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (BmimNTf2) were investigated with two dimensional infrared (2D IR) vibrational echo spectroscopy and polarization selective pump-probe (PSPP) experiments. The CN stretch frequency of a modified Bmim+ cation (referred to hereafter as 2-SeCN-Bmim+), in which a SeCN moiety was substituted onto the C-2 position of the imidazolium ring, was used as a vibrational probe. A major result of the 2D IR experiments is the observation of a long timescale structural spectral diffusion component of 600 ps in addition to short and intermediate timescales similar to those measured for selenocyanate anion (SeCN‒) dissolved in BmimNTf2...
January 18, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28096239/skin-to-skin-care-in-preterm-infants-receiving-respiratory-support-does-not-lead-to-physiological-instability
#14
Laila Lorenz, Jennifer A Dawson, Hannah Jones, Susan E Jacobs, Jeanie L Cheong, Susan M Donath, Peter G Davis, C Omar F Kamlin
OBJECTIVE: Providing skin-to-skin care (SSC) to preterm infants is standard practice in many neonatal intensive care units. There are conflicting reports on the stability of oxygen saturation (SpO2) during SSC, which may create a barrier to a wider implementation of SSC to infants receiving respiratory support. Regional cerebral oxygenation (rcO2) measured using near-infrared spectroscopy can serve as a surrogate parameter for cerebral oxygen delivery and consumption. We hypothesised that rcO2 during SSC would be similar to standard care in preterm infants receiving respiratory support...
January 17, 2017: Archives of Disease in Childhood. Fetal and Neonatal Edition
https://www.readbyqxmd.com/read/28094503/controlled-doping-in-graphene-monolayers-by-trapping-organic-molecules-at-graphene-substrate-interface
#15
Pawan Kumar Srivastava, Premlata Yadav, Varsha Rani, Subhasis Ghosh
We report controlled doping in graphene monolayers through charge transfer interaction by trapping selected organic molecules between graphene and underneath substrates. Controllability has been demonstrated in terms of shift in Raman spectra and Dirac point in graphene monolayers. The shift in the Dirac point to positive (negative) gate bias in the transfer characteristics of graphene monolayer based field effect transistor is a clear indication of p(n) type doping in graphene as a consequence of charge transfer interaction between organic molecules and graphene...
January 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28094161/disinhibition-in-children-with-attention-deficit-hyperactivity-disorder-changes-in-oxy-hb-on-near-infrared-spectroscopy-during-rock-paper-scissors-task
#16
Sayaka Ishii, Yoshimi Kaga, Tomoko Tando, Kakuro Aoyagi, Fumikazu Sano, Hideaki Kanemura, Kanji Sugita, Masao Aihara
OBJECTIVE: Attention-deficit/hyperactivity disorder (AD/HD) is a common developmental disorder. Many reports have suggested that symptoms of AD/HD are related to frontal lobe dysfunctions, particularly disinhibition. However, measuring neurological findings with biomarkers during frontal functional tasks has sometimes been difficult in children with AD/HD. This study aimed to investigate frontal inhibitory function objectively in children with AD/HD during "rock, paper, scissors" (RPS) tasks, as a familiar game for Japanese children, using near-infrared spectroscopy (NIRS)...
January 13, 2017: Brain & Development
https://www.readbyqxmd.com/read/28093233/changes-in-vascular-responsiveness-during-a-hyperglycemia-challenge-measured-by-near-infrared-spectroscopy-vascular-occlusion-test
#17
Rogério Nogueira Soares, Raylene A Reimer, Juan Manuel Murias
BACKGROUND: Postprandial hyperglycemia is associated with impaired vascular responsiveness. Recent studies have established the use of a near-infrared spectroscopy (NIRS)-derived approach, combined with a vascular occlusion test (VOT), to examine vascular responsiveness within the microvasculature in normoglycemia. The aim of this study was to examine whether this NIRS-VOT technique could detect differences in vascular responsiveness following a hyperglycemic challenge. METHODS AND RESULTS: Fourteen young healthy individuals participated in the study...
January 13, 2017: Microvascular Research
https://www.readbyqxmd.com/read/28091649/optical-properties-of-trinuclear-metal-chalcogenolate-complexes-room-temperature-nir-fluorescence-in-cu2ti-sph-6-pph3-2
#18
Michael Kühn, Sergei Lebedkin, Florian Weigend, Andreas Eichhöfer
The optical properties of four isostructural trinuclear chalcogenolato bridged metal complexes [Cu2Sn(SPh)6(PPh3)2], [Cu2Sn(SePh)6(PPh3)2], [Ag2Sn(SPh)6(PPh3)2] and [Cu2Ti(SPh)6(PPh3)2] have been investigated by absorption and photoluminescence spectroscopy and time-dependent density functional theory (TDDFT) calculations. All copper-tin compounds demonstrate near-infrared (NIR) phosphorescence at ∼900-1100 nm in the solid state at low temperature, which is nearly absent at ambient temperature. Stokes shifts of these emissions are found to be unusually large with values of about 1...
January 16, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28090126/fourier-transform-infrared-absorption-spectroscopy-for-quantitative-analysis-of-gas-mixtures-at-low-temperatures-for-homeland-security-applications
#19
D C Meier, K D Benkstein, W S Hurst, P M Chu
Performance standard specifications for point chemical vapor detectors are established in ASTM E 2885-13 and ASTM E 2933-13. The performance evaluation of the detectors requires the accurate delivery of known concentrations of the chemical target to the system under test. Referee methods enable the analyte test concentration and associated uncertainties in the analyte test concentration to be validated by independent analysis, which is especially important for reactive analytes. This work extends the capability of a previously demonstrated method for using Fourier transform infrared (FT-IR) absorption spectroscopy for quantitatively evaluating the composition of vapor streams containing hazardous materials at Acute Exposure Guideline Levels (AEGL) to include test conditions colder than laboratory ambient temperatures...
May 2017: Journal of Testing and Evaluation
https://www.readbyqxmd.com/read/28089785/mechanistic-modelling-of-infrared-mediated-energy-transfer-during-the-primary-drying-step-of-a-continuous-freeze-drying-process
#20
Pieter-Jan Van Bockstal, Séverine Thérèse F C Mortier, Laurens De Meyer, Jos Corver, Chris Vervaet, Ingmar Nopens, Thomas De Beer
Conventional pharmaceutical freeze-drying is an inefficient and expensive batch-wise process, associated with several disadvantages leading to an uncontrolled end product variability. The proposed continuous alternative, based on spinning the vials during freezing and on optimal energy supply during drying, strongly increases process efficiency and improves product quality (uniformity). The heat transfer during continuous drying of the spin frozen vials is provided via non-contact infrared (IR) radiation. The energy transfer to the spin frozen vials should be optimised to maximise the drying efficiency while avoiding cake collapse...
January 12, 2017: European Journal of Pharmaceutics and Biopharmaceutics
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