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"Near infrared spectroscopy"

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https://www.readbyqxmd.com/read/28917809/characterization-of-sodium-tripolyphosphate-and-sodium-citrate-dehydrate-residues-on-surfaces
#1
M Sadi Gurses, Can Erkey, Seda Kizilel, Alper Uzun
Sodium tripolyphosphate (STPP) and sodium citrate dihydrate (sodium citrate) are the most widely used components in detergent formulations. Here, we characterized these two components on glass surfaces to assess their possible exposures from white spots on dishwasher-washed dishes. Ultraviolet/visible near infrared spectroscopy (UV/Vis-NIR), Fourier transform infrared spectroscopy (FTIR) in the attenuated total reflectance mode (ATR-FTIR), Raman spectroscopy and laser ablation-inductively coupled plasma mass spectroscopy (LA-ICP-MS) were utilized to design calibration models for a range of STPP and sodium citrate concentrations 1-8% w/w) precipitated on glass surfaces...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28917795/portable-near-infrared-spectroscopy-applied-to-quality-control-of-brazilian-coffee
#2
Radigya M Correia, Flavia Tosato, Eloilson Domingos, Rayza R T Rodrigues, Luiz Felipe M Aquino, Paulo R Filgueiras, Valdemar Lacerda, Wanderson Romão
The use of portable micro-spectrometers such as a micro near infrared region (microNIR) spectrometer is a promising technique for solving analytical problems in several areas of science. This work evaluated the potential of microNIR in quality control of Arabica coffee. Arabica coffee has a high commercial value product, motivating the development of analytical methods with high sensitivity and accuracy for detection of its adulteration. Herein, microNIR was successfully used to determine the quality of Arabica coffee by identification and quantification of adulterations such as Robusta coffee (in different roasting levels), as well as corn, peels, and sticks...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28917750/portable-near-infrared-spectroscopy-applied-to-fuel-quality-control
#3
Radigya M Correia, Eloilson Domingos, Vagne M Cáo, Brenda R F Araujo, Sthefany Sena, Layla U Pinheiro, André M Fontes, Luiz Felipe M Aquino, Ernesto C Ferreira, Paulo R Filgueiras, Wanderson Romão
Fuel quality control has gained interest in many countries owing to the potential damage of low-quality fuel to engines, the environment, and economy. Thus, the application of analytical techniques to verify quality control of fuels has become crucial. The portable micro-spectrometer in the near infrared region (microNIR) has gained credibility as a successful analytical technique in several quality control sectors. The possibility of real-time analysis using a nondestructive and reliable method is the main advantage of this methodology...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28916447/perception-of-caucasian-and-african-faces-in-5-to-9-month-old-caucasian-infants-a-functional-near-infrared-spectroscopy-study
#4
Susanna Timeo, Sabrina Brigadoi, Teresa Farroni
Race is an important perceptual cue for face perception. In adults, other-race faces are elaborated differently and remembered less well than own-race faces. Moreover, they show a different pattern of activation at the neural level. Developmental studies demonstrated that, during the first year of life, infants start to show the same behavioral pattern as adults in race perception. However, little is known about where and how in the brain other-race perception is elaborated in this population. The present study is the first to investigate the development of different neural responses to faces of different race in infants using functional near-infrared spectroscopy (fNIRS)...
September 12, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28916043/nocturnal-hypoglycemic-alarm-based-on-near-infrared-spectroscopy-in%C3%A2-vitro-simulation-studies
#5
Sanjeewa R Karunathilaka, Gary W Small
An alarm algorithm for detecting episodes of nocturnal hypoglycemia is demonstrated in simulation studies that incorporate the use of a tissue phantom. Based on transmission spectra collected in the near-infrared combination region of 4000-5000 cm(-1), pattern recognition methods are used to classify spectra into alarm and non-alarm data classes on the basis of whether or not they signify a glucose excursion below a user-defined hypoglycemic alarm threshold. A reference spectrum and corresponding glucose concentration are acquired at the start of the monitoring period, and absorbance values of subsequent spectra are computed relative to this reference...
September 22, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28915750/near-infrared-spectroscopy-and-anharmonic-theory-of-the-h2o-ar1-2-cation-complexes
#6
J Philipp Wagner, David C McDonald, Michael A Duncan
Weakly bound complexes of the water radical cation with argon (H2O(+)Arn, n = 1,2) were generated by an electrical discharge/supersonic expansion and probed with mid- and near-infrared photodissociation spectroscopy in the 2050-4550 and 4850-7350 cm(-1) regions. To elucidate these spectra, these complexes were studied computationally at the CCSD(T) level including anharmonicity with the VPT2 method. The comparison between experiment and predicted spectra demonstrates that the VPT2 method is adequate to capture most of the vibrational band positions and their intensities...
September 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28914554/when-cooperation-goes-wrong-brain-and-behavioral-correlates-of-ineffective-joint-strategies-in-dyads
#7
Michela Balconi, Laura Gatti, Maria Elide Vanutelli
Human life is connoted by sophisticated interactions that involve not only single individuals, but larger social groups composed by members interacting each other. Cooperation secures a benefit to all the people engaged as well as important behaviors like helping, sharing, and acting prosocially. But what happens when the joint actions are not effective? In the present study we asked 24 participants paired in 12 dyads to cooperate during an attentional task in a way to synchronize their responses and obtain better outcomes...
September 15, 2017: International Journal of Neuroscience
https://www.readbyqxmd.com/read/28914453/potential-effectiveness-of-visible-and-near-infrared-spectroscopy-coupled-with-wavelengths-selection-for-real-time-grapevine-leaf-water-status-measurement
#8
Valentina Giovenzana, Roberto Beghi, Simone Parisi, Lucio Brancadoro, Riccardo Guidetti
BACKGROUND: Increasing attention is paid to non-destructive methods for water status real time monitoring as a potential solution, replacing the tedious conventional techniques which are time consuming and not easily to perform directly in field. The objective was to test the potential effectiveness of two portable optical devices (visible/near infrared, vis/NIR; and near infrared, NIR) for a rapid and non-destructive evaluation of the water status of grapevine leaves. Moreover, a variable selection methodology was proposed to determine a set of candidate variables for the prediction of water potential (Ψ; MPa) related to leaf water status in a view of a simplified optical device...
September 15, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28914230/prefrontal-cortical-responses-in-children-with-prenatal-alcohol-related-neurodevelopmental-impairment-a-functional-near-infrared-spectroscopy-study
#9
Julie A Kable, Claire D Coles
OBJECTIVE: Disruption in the neural activation of the prefrontal cortex (PFC) in modulating arousal was explored in children with heavy prenatal alcohol exposure (PAE), who have known neurobehavioral impairment. METHODS: During a task that elicits frustration, functional near-infrared spectroscopy (fNIRS) was used to measure PFC activation, specifically levels of oxygenated (HBO) and deoxygenated (HBR) hemoglobin, in children with PAE (n=18) relative to typically developing Controls (n=12) and a Clinical Contrast group with other neurodevelopmental or behavioral problems (n=14)...
September 2, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28912697/brains-in-competition-improved-cognitive-performance-and-inter-brain-coupling-by-hyperscanning-paradigm-with-functional-near-infrared-spectroscopy
#10
Michela Balconi, Maria E Vanutelli
Hyperscanning brain paradigm was applied to competitive task for couples of subjects. Functional Near-Infrared Spectroscopy (fNIRS) and cognitive performance were considered to test inter-brain and cognitive strategy similarities between subjects (14 couples) during a joint-action. We supposed increased brain-to-brain coupling and improved cognitive outcomes due to joint-action and the competition. As supposed, the direct interaction between the subjects and the observed external feedback of their performance (an experimentally induced fictitious feedback) affected the cognitive performance with decreased Error Rates (ERs), and Response Times (RTs)...
2017: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/28912130/near-infrared-spectroscopy-of-superficial-and-deep-rectus-femoris-reveals-markedly-different-exercise-response-to-superficial-vastus-lateralis
#11
Shunsaku Koga, Dai Okushima, Thomas J Barstow, Harry B Rossiter, Narihiko Kondo, David C Poole
To date our knowledge of skeletal muscle deoxygenation as measured by near-infrared spectroscopy (NIRS) is predicated almost exclusively on sampling of superficial muscle(s), most commonly the vastus lateralis (VL-s). Recently developed high power NIRS facilitates simultaneous sampling of deep (i.e., rectus femoris, RF-d) and superficial muscles of RF (RF-s) and VL-s. Because deeper muscle is more oxidative with greater capillarity and sustains higher blood flows than superficial muscle, we used time-resolved NIRS to test the hypotheses that, following exercise onset, the RF-d has slower deoxy[Hb+Mb] kinetics with reduced amplitude than superficial muscles...
September 2017: Physiological Reports
https://www.readbyqxmd.com/read/28902182/gestational-age-dependent-relationship-between-cerebral-oxygen-extraction-and-blood-pressure
#12
Zachary A Vesoulis, Steve M Liao, Amit M Mathur
BackgroundPremature infants may lack mature cerebrovascular autoregulatory function and fail to adapt oxygen extraction to decreasing systemic perfusion.MethodsInfants ≤28 weeks of gestational age (GA) were recruited. Systemic oxygen saturation (SpO2), mean arterial blood pressure (MABP), and cerebral saturation (near-infrared spectroscopy, SctO2) were measured continuously over the first 72 h. Resulting data underwent error-processing. For each remaining 10 m window, the mean MABP and fractional tissue oxygen extraction (FTOE) were calculated...
September 13, 2017: Pediatric Research
https://www.readbyqxmd.com/read/28900719/the-effects-of-exercise-induced-muscle-damage-on-critical-torque
#13
Marcin K Szczyglowski, Carl J Ade, Jason A Campbell, Christopher D Black
OBJECTIVE: Exercise-induced muscle damage (EIMD) has been shown to reduce endurance exercise performance. This study examined the effects of EIMD on critical torque (CT) and the sum of the torque integral above CT during (∫ T total) during a 5-min all-out, intermittent isometric knee extension exercise. METHODS: CT was determined in eight participants prior to and 48-h following EIMD. EIMD was induced using electrically stimulated eccentric knee extensions until maximal voluntary strength (MVC) was reduced by 40%...
September 12, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28898243/neoatherosclerosis-development-following-bioresorbable-vascular-scaffold-implantation-in-diabetic-and-non-diabetic-swine
#14
Nienke S van Ditzhuijzen, Mie Kurata, Mieke van den Heuvel, Oana Sorop, Richard W B van Duin, Ilona Krabbendam-Peters, Jurgen Ligthart, Karen Witberg, Magdalena Murawska, Brett Bouma, Martin Villiger, Hector M Garcia-Garcia, Patrick W Serruys, Felix Zijlstra, Gijs van Soest, Dirk-Jan Duncker, Evelyn Regar, Heleen M M van Beusekom
BACKGROUND: DM remains a risk factor for poor outcome after stent-implantation, but little is known if and how DM affects the vascular response to BVS. AIM: The aim of our study was to examine coronary responses to bioresorbable vascular scaffolds (BVS) in swine with and without diabetes mellitus fed a 'fast-food' diet (FF-DM and FF-NDM, respectively) by sequential optical coherence tomography (OCT)-imaging and histology. METHODS: Fifteen male swine were evaluated...
2017: PloS One
https://www.readbyqxmd.com/read/28894759/differential-efficiency-of-transcutaneous-electrical-nerve-stimulation-in-dominant-versus-nondominant-hands-in-fibromyalgia-placebo-controlled-functional-near-infrared-spectroscopy-study
#15
Aykut Eken, Murat Kara, Bora Baskak, Ayşegül Baltacı, Didem Gökçay
Using functional near-infrared spectroscopy (fNIRS), modulation of hemodynamic responses by transcutaneous electrical nerve stimulation (TENS) during delivery of nociceptive stimulation was investigated in fibromyalgia (FM) patients and healthy controls for both hands. Two experiments were conducted: (1) median nerve stimulation with TENS and (2) painful stimulation using electronic von Frey filaments with TENS/placebo TENS. Mean [Formula: see text] brain activity was compared across groups and conditions using factorial ANOVA...
January 2018: Neurophotonics
https://www.readbyqxmd.com/read/28893511/near-infrared-spectroscopy-a-tool-for-solid-state-characterization
#16
Rahul B Chavan, Nallamothu Bhargavi, Anurag Lodagekar, Nalini R Shastri
Physical characterization of solid drugs is of paramount importance because the biopharmaceutical properties and/or processing behavior can be altered. Early identification and monitoring of solid-state transformation is a crucial requirement for pharmaceutical product development. In combination with chemometrics, a nondestructive and noninvasive technique such as near infrared spectroscopy (NIR) is a powerful tool for solid-state characterization. The main focus of this review is the application of NIR for qualitative and quantitative analysis of solid forms of drugs and excipients...
September 8, 2017: Drug Discovery Today
https://www.readbyqxmd.com/read/28892170/application-of-visible-near-infrared-spectroscopy-in-the-prediction-of-azodicarbonamide-in-wheat-flour
#17
Wenkai Che, Laijun Sun, Qian Zhang, Dan Zhang, Dandan Ye, Wenyi Tan, Lekai Wang, Changjun Dai
Azodicarbonamide is wildly used in flour industry as a flour gluten fortifier in many countries, but it was proved by some researches to be dangerous or unhealthy for people and not suitable to be added in flour. Applying a rapid, convenient, and noninvasive technique in food analytical procedure for the safety inspection has become an urgent need. This paper used Vis/NIR reflectance spectroscopy analysis technology, which is based on the physical property analysis to predict the concentration of azodicarbonamide in flour...
September 11, 2017: Journal of Food Science
https://www.readbyqxmd.com/read/28891839/the-relative-effects-of-dexmedetomidine-and-propofol-on-cerebral-blood-flow-velocity-and-regional-brain-oxygenation-a-randomised-noninferiority-trial
#18
Ehab Farag, Michael Kot, Attila Podolyak, Maged Argalious, Milind Deogaonkar, Edward J Mascha, Zekun Xu, Irene Katzan, Zeyd Ebrahim
BACKGROUND: Dexmedetomidine constricts cerebral blood vessels without a concomitant reduction in cerebral metabolic oxygen consumption. Its safety as a sedative in patients with neurological diseases thus remains uncertain. OBJECTIVE: Our primary objective was to test the hypothesis that dexmedetomidine is noninferior to propofol as regards cerebral blood flow (CBF) velocity and brain oxygenation. DESIGN: Unblinded randomised trial. SETTING: Cleveland Clinic Hospital, Cleveland, from November 2010 to July 2013...
June 19, 2017: European Journal of Anaesthesiology
https://www.readbyqxmd.com/read/28889923/social-risky-decision-making-reveals-gender-differences-in-the-tpj-a-hyperscanning-study-using-functional-near-infrared-spectroscopy
#19
Mingming Zhang, Tao Liu, Matthew Pelowski, Huibin Jia, Dongchuan Yu
Previous neuroscience studies have investigated neural correlates of risky decision-making in a single-brain frame during pseudo social (predominantly non face-to-face) contexts. To fully understand the risky decision-making behavior in more natural social interactions, the present study employed a functional near-infrared spectroscopy (fNIRS) hyperscanning technique to simultaneously measure pairs of participants' fronto-temporal activations in a face-to-face gambling card-game. The intra-brain results revealed that both those who identified as males and as females showed higher activations in their mPFC and in the inferior parts of the frontopolar area, as well as in the tempo-parietal junction (TPJ) in cases involving higher versus lower risk...
September 7, 2017: Brain and Cognition
https://www.readbyqxmd.com/read/28888977/emerging-technologies-for-the-non-invasive-characterization-of-physical-mechanical-properties-of-tablets
#20
REVIEW
Vivek S Dave, Hend I Shahin, Susanne R Youngren-Ortiz, Mahavir B Chougule, Rahul V Haware
The density, porosity, breaking force, viscoelastic properties, and the presence or absence of any structural defects or irregularities are important physical-mechanical quality attributes of popular solid dosage forms like tablets. The irregularities associated with these attributes may influence the drug product functionality. Thus, an accurate and efficient characterization of these properties is critical for successful development and manufacturing of a robust tablets. These properties are mainly analyzed and monitored with traditional pharmacopeial and non-pharmacopeial methods...
September 6, 2017: International Journal of Pharmaceutics
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