keyword
MENU ▼
Read by QxMD icon Read
search

Near-infrared spectroscopy

keyword
https://www.readbyqxmd.com/read/29150648/shedding-light-on-the-neonatal-brain-probing-cerebral-hemodynamics-by-diffuse-optical-spectroscopic-methods
#1
Parisa Farzam, Erin M Buckley, Pei-Yi Lin, Katherine Hagan, P Ellen Grant, Terrie Eleanor Inder, Stefan A Carp, Maria Angela Franceschini
Investigating the cerebral physiology of healthy term newborns' brains is important for better understanding perinatal brain injuries, of which the most common etiologies are hypoxia and ischemia. Hence, cerebral blood flow and cerebral oxygenation are important biomarkers of brain health. In this study, we employed a hybrid diffuse optical system consisting of diffuse correlation spectroscopy (DCS) and frequency-domain near infrared spectroscopy (FDNIRS) to measure hemoglobin concentration, oxygen saturation, and indices of cerebral blood flow and metabolism...
November 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29149695/rheo-optical-near-infrared-nir-spectroscopy-study-of-partially-miscible-polymer-blend-of-polymethyl-methacrylate-pmma-and-polyethylene-glycol-peg
#2
Hideyuki Shinzawa, Junji Mizukado
Tensile deformations of a partially miscible blend of polymethyl methacrylate (PMMA) and polyethylene glycol (PEG) is studied by a rheo-optical characterization near-infrared (NIR) technique to probe deformation behavior during tensile deformation. Sets of NIR spectra of the polymer samples were collected by using an acousto-optic tunable filter (AOTF) NIR spectrometer coupled with a tensile testing machine as an excitation device. While deformations of the samples were readily captured as strain-dependent NIR spectra, the entire feature of the spectra was overwhelmed with the baseline fluctuation induced by the decrease in the sample thickness and subsequent change in the light scattering...
November 11, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29149693/near-infrared-spectroscopy-based-monitoring-of-extraction-processes-of-raw-material-with-the-help-of-dynamic-predictive%C3%A2-modeling
#3
Haixia Wang, Tongchuan Suo, Xiaolin Wu, Yue Zhang, Chunhua Wang, Heshui Yu, Zheng Li
The control of batch-to-batch quality variations remains a challenging task for pharmaceutical industries, e.g., traditional Chinese medicine (TCM) manufacturing. One difficult problem is to produce pharmaceutical products with consistent quality from raw material of large quality variations. In this paper, an integrated methodology combining the near infrared spectroscopy (NIRS) and dynamic predictive modeling is developed for the monitoring and control of the batch extraction process of licorice. With the spectra data in hand, the initial state of the process is firstly estimated with a state-space model to construct a process monitoring strategy for the early detection of variations induced by the initial process inputs such as raw materials...
November 10, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29149423/structural-and-visible-near%C3%A2-infrared-optical-properties-of-cr-doped-tio2-for-colored-cool-pigments
#4
Le Yuan, Xiaolong Weng, Ming Zhou, Qingyong Zhang, Longjiang Deng
Chromium-doped TiO2 pigments were synthesized via a solid-state reaction method and studied with X-ray diffraction, SEM, XPS, and UV-VIS-NIR reflectance spectroscopy. The incorporation of Cr(3+) accelerates the transition from the anatase phase to the rutile phase and compresses the crystal lattice. Moreover, the particle morphology, energy gap, and reflectance spectrum of Cr-doped TiO2 pigments is affected by the crystal structure and doping concentration. For the rutile samples, some of the Cr(3+) ions are oxidized to Cr(4+) after sintering at a high temperature, which leads to a strong near-infrared absorption band due to the (3)A2 → (3) T1 electric dipole-allowed transitions of Cr(4+)...
November 17, 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29148891/hyperventilation-and-breath-holding-test-with-indocyanine-green-kinetics-predicts-cerebral-hyperperfusion-after-carotid-artery-stenting
#5
Ichiro Nakagawa, Shohei Yokoyama, Daisuke Wajima, Fumihiko Nishimura, Shuichi Yamada, Hiroshi Yokota, Yasushi Motoyama, Young Su Park, Takeshi Wada, Kimihiko Kichikawa, Hiroyuki Nakase
Cerebral hyperperfusion syndrome (CHS) is a serious complication following carotid artery stenting (CAS), but definitive early prediction of CHS has not been established. Here, we evaluated whether indocyanine green kinetics and near-infrared spectroscopy (ICG-NIRS) with hyperventilation (HV) and the breath-holding (BH) test can predict hyperperfusion phenomenon after CAS. The blood flow index (BFI) ratio during HV and BH was prospectively monitored using ICG-NIRS in 66 patients scheduled to undergo CAS. Preoperative cerebrovascular reactivity (CVR) and the postoperative asymmetry index (AI) were also assessed with single-photon emission computed tomography before and after CAS and the correlation with the BFI HV/rest ratio, BFI BH/rest ratio was evaluated...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/29148786/n-alkanethiols-directly-grown-on-a-bare-si-111-surface-from-disordered-to-ordered-transition
#6
Lo-Yueh Chang, Yen-Chien Kuo, Hung Wei Shiu, Chia-Hsin Wang, Yao-Chang Lee, Yaw-Wen Yang, Shangjr Gwo, Chia-Hao Chen
We observed the growth phase transition of n-alkanethiols (AT), CH3(CH2)n-1SH, n = 4 ~16, directly implanted on a bare Si(111) surface, forming an AT monolayer. These monolayers were characterized with static water-contact angle, high-resolution X-ray photoelectron spectroscopy, near-edge X-ray fine-structure spectroscopy and grazing-angle reflection absorption Fourier-transform infrared spectroscopy. The integrated spectral results indicated that the implanted n-AT molecules formed a self-oriented and densely packed monolayer through formation of an S-Si bond...
November 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29146434/cerebral-hyperperfusion-syndrome-after-endovascular-reperfusion-therapy-in-a-patient-with-acute-internal-carotid-artery-and-middle-cerebral-artery-occlusions
#7
Tetsuya Hashimoto, Shoji Matsumoto, Mitsushige Ando, Hideo Chihara, Atsushi Tsujimoto, Taketo Hatano
BACKGROUND: Cerebral hyperperfusion syndrome (CHS) is known to be a rare but devastating complication of carotid artery revascularization. Because patients with acute ischemic stroke due to acute major cerebral and/or cervical artery occlusion treated with endovascular reperfusion therapy may have impaired autoregulation in the cerebral vasculature, these patients may also develop CHS. Despite the growing number of endovascular reperfusion procedures for acute ischemic stroke, this complication has only rarely been reported...
November 13, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/29144417/fast-low-cost-and-non-destructive-physico-chemical-analysis-of-virgin-olive-oils-using-near-infrared-reflectance-spectroscopy
#8
Ana Garrido-Varo, María-Teresa Sánchez, María-José De la Haba, Irina Torres, Dolores Pérez-Marín
Near-Infrared (NIR) Spectroscopy was used for the non-destructive assessment of physico-chemical quality parameters in olive oil. At the same time, the influence of the sample presentation mode (spinning versus static cup) was evaluated using two spectrophotometers with similar optical characteristics. A total of 478 olive oil samples were used to develop calibration models, testing various spectral signal pre-treatments. The models obtained by applying MPLS regression to spectroscopic data yielded promising results for olive oil quality measurements, particularly for acidity, the peroxide index and alkyl and ethyl ester content...
November 16, 2017: Sensors
https://www.readbyqxmd.com/read/29143773/phonon-confinement-induced-non-concomitant-near-infrared-emission-along-a-single-zno-nanowire-spatial-evolution-study-of-phononic-and-photonic-properties
#9
Po-Hsun Shih, Tai-Yue Li, Yu-Chen Yeh, Sheng Yun Wu
The impact of mixed defects on ZnO phononic and photonic properties at the nanoscale is only now being investigated. Here we report an effective strategy to study the distribution of defects along the growth direction of a single ZnO nanowire (NW), performed qualitatively as well as quantitatively using energy dispersive spectroscopy (EDS), confocal Raman-, and photoluminescence (PL)-mapping technique. A non-concomitant near-infrared (NIR) emission of 1.53 ± 0.01 eV was observed near the bottom region of 2...
October 28, 2017: Nanomaterials
https://www.readbyqxmd.com/read/29140967/near-infrared-spectroscopy-and-vascular-occlusion-test-for-predicting-clinical-outcome-in-pediatric-cardiac-patients-a-prospective-observational-study
#10
Ji-Hyun Lee, Young-Eun Jang, In-Kyung Song, Eun-Hee Kim, Hee-Soo Kim, Jin-Tae Kim
OBJECTIVES: This study is designed to determine the feasibility and utility of vascular occlusion test variables as measured by INVOS Medtronic, Dublin, Ireland) in pediatric cardiac patients. DESIGN: A prospective observational study. SETTING: A tertiary children's hospital. PATIENTS: Children less than or equal to 8 years old who were scheduled for elective cardiac surgery under cardiopulmonary bypass. INTERVENTIONS: A vascular occlusion test (3 min of ischemia and reperfusion) was performed on the calf at three time points: after induction of anesthesia (T0), during cardiopulmonary bypass (T1), and after sternal closure (T2)...
November 14, 2017: Pediatric Critical Care Medicine
https://www.readbyqxmd.com/read/29140137/v%C3%AC-o2-and-muscle-deoxygenation-kinetics-during-skating-comparison-between-slide-board-and-treadmill-skating
#11
Tatiane Piucco, Rogério Soares, Fernando Diefenthaeler, Guillaume Millet, Juan Murias
PURPOSE: this study aimed to compare the oxygen uptake (V̇O2) kinetics during skating on a treadmill and skating on a slide board and discuss potential mechanisms that might control the V̇O2 kinetics responses during skating. METHODS: breath-by-breath pulmonary V̇O2 and near-infrared spectroscopy-derived muscle deoxygenation ([HHbMb]) were monitored continuously in 12 well-trained young long track speed skaters. On-transient V̇O2 and [HHbMb] responses to skating on a treadmill and skating on a slide board at 80% of the estimated gas exchange threshold were fitted as mono-exponential function...
November 15, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29137806/a-novel-multimodal-computational-system-using-near-infrared-spectroscopy-predicts-the-need-for-ecmo-initiation-in-neonates-with-congenital-diaphragmatic-hernia
#12
Stephanie M Cruz, Patricio E Lau, Craig G Rusin, Candace C Style, Darrell L Cass, Caraciolo J Fernandes, Timothy C Lee, Christopher J Rhee, Sundeep Keswani, Rodrigo Ruano, Stephen E Welty, Oluyinka O Olutoye
BACKGROUND/PURPOSE: The purpose of this study was to develop a computational algorithm that would predict the need for ECMO in neonates with congenital diaphragmatic hernia (CDH). METHODS: CDH patients from August 2010 to 2016 were enrolled in a study to continuously measure cerebral tissue oxygen saturation (cStO2) of left and right cerebral hemispheres. NIRS devices utilized were FORE-SIGHT, CASMED and INVOS 5100, Somanetics. Using MATLAB©, a data randomization function was used to deidentify and blindly group patient's data files as follows: 12 for the computational model development phase (6 ECMO and 6 non-ECMO) and the remaining patients for the validation phase...
October 12, 2017: Journal of Pediatric Surgery
https://www.readbyqxmd.com/read/29136825/determining-moisture-content-in-pasta-by-vibrational-spectroscopy
#13
Tomasz Czaja, Ewelina Kuzawińska, Aldona Sobota, Roman Szostak
Pasta aside from bread is the most consumed cereal-based product in the world. Its taste and cooking ease makes it the basis of many cuisines. The pasta dough formed by mixing flour and water is extruded through an extrusion die to mould the appropriate pasta form and is dried to obtain a stable product. The concentration of moisture in the pasta dough is a one of key parameters determining the final quality of the product. Monitoring the moisture content of pasta after extrusion is also critically important...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29135482/long-term-darapladib-use-does-not-affect-coronary-plaque-composition-assessed-using-multimodality-intravascular-imaging-modalities-a-randomized-controlled-study
#14
Woong Gil Choi, Megha Prasad, Ryan Lennon, Rajiv Gulati, Abhiram Prasad, Lilach O Lerman, Amir Lerman
BACKGROUND: Lipoprotein-associated phospholipase A2 (Lp-PLA2) may play a role in plaque progression and vulnerability. We aimed to define plaque characteristics on multimodality intravascular imaging in patients with coronary endothelial dysfunction in response to long-term inhibition of Lp-PLA2 by darapladib. PATIENTS AND METHODS: This is a double-blinded, randomized study screening 70 patients, and enrolling 54 patients with suspected ischemia, without obstructive disease on angiography and with coronary endothelial dysfunction by invasive assessment...
November 10, 2017: Coronary Artery Disease
https://www.readbyqxmd.com/read/29133861/coupling-of-oxy-and-deoxyhemoglobin-concentrations-with-eeg-rhythms-during-motor-task
#15
Piotr Lachert, Dariusz Janusek, Przemyslaw Pulawski, Adam Liebert, Daniel Milej, Katarzyna J Blinowska
A relationship between the brain rhythmic activity and the hemodynamic response was studied using the simultaneous measurement of electroencephalogram (EEG) and the functional near-infrared spectroscopy (fNIRS) during a motor task (self-paced right finger movements) for 10 subjects. An EEG recording with a 32-electrode (10-10) system was made and the hemodynamic response was obtained using 8 optodes placed over the sensorimotor cortex on both hemispheres. During the task an increase in oxyhemoglobine (HbO) was accompanied by a decrease in deoxyhemoglobine (HbR) concentration and a decrease in amplitudes (desynchronisation) of alpha (8-13 Hz) and beta (13-30 Hz) EEG rhythms...
November 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29133088/fructose-human-serum-albumin-interaction-undergoes-numerous-biophysical-and-biochemical-changes-before-forming-ages-and-aggregates
#16
Asif Zaman, Zarina Arif, Moinuddin, Khursheed Alam
Fructose is a reducing and highly lipogenic sugar that has unique metabolic effects in the liver. Non-enzymatic fructosylation of proteins generates advanced glycation end products (AGEs). Human serum albumin (HSA) may undergo fructosylation vis-à-vis AGEs formation. High fructose consumption may lead to structurally altered and functionally compromised fructosylated-HSA-AGEs, which can cause damage to hepatocytes resulting in hepatic macro- and microvesicular steatosis. In this study, HSA was incubated with varying concentrations of fructose for 10days and the induced changes were studied...
November 10, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29131826/an-interactive-sports-video-game-as-an-intervention-for-rehabilitation-of-community-living-patients-with-schizophrenia-a-controlled-single-blind-crossover-study
#17
Nobuko Shimizu, Tomohiro Umemura, Masahiro Matsunaga, Takayoshi Hirai
Hypofrontality is a state of decreased cerebral blood flow in the prefrontal cortex during executive function performance; it is commonly observed in patients with schizophrenia. Cognitive dysfunction, as well as the psychological symptoms of schizophrenia, influences the ability of patients to reintegrate into society. The current study investigated the effects of an interactive sports video game (IVG; Nintendo Wii™ Sports Resort) on frontal lobe function of patients with schizophrenia. A sample of eight patients (6 male and 2 female; mean age = 46...
2017: PloS One
https://www.readbyqxmd.com/read/29131125/splanchnic-cerebral-oxygenation-ratio-decreases-during-enteral-feedings-in-anemic-preterm-infants-observations-under-near-infrared-spectroscopy
#18
Katherine Braski, Kimberlee Weaver-Lewis, Manndi Loertscher, Qian Ding, Xiaoming Sheng, Mariana Baserga
BACKGROUND: Anemia is common in premature infants. Due to risks with red blood cell transfusions, many anemic infants are not transfused. The implications of this pathophysiologic status, especially at times of increased metabolic demand (enteral feedings), is not well understood. Near-infrared spectroscopy (NIRS) allows for the noninvasive determination of regional oxygen saturations (rSO2) in tissues such as the brain and mesentery, giving insight into their oxygen sufficiency. OBJECTIVE: We tested the hypothesis that during enteral feedings very low birth weight (VLBW) infants with a hematocrit ≤28% will experience a decrease in splanchnic rSO2 and splanchnic-cerebral oxygenation ratio (SCOR)...
November 8, 2017: Neonatology
https://www.readbyqxmd.com/read/29129466/a-discrimination-model-in-waste-plastics-sorting-using-nir-hyperspectral-imaging-system
#19
Yan Zheng, Jiarui Bai, Jingna Xu, Xiayang Li, Yimin Zhang
Classification of plastics is important in the recycling industry. A plastic identification model in the near infrared spectroscopy wavelength range 1000-2500 nm is proposed for the characterization and sorting of waste plastics using acrylonitrile butadiene styrene (ABS), polystyrene (PS), polypropylene (PP), polyethylene (PE), polyethylene terephthalate (PET), and polyvinyl chloride (PVC). The model is built by the feature wavelengths of standard samples applying the principle component analysis (PCA), and the accuracy, property and cross-validation of the model were analyzed...
November 9, 2017: Waste Management
https://www.readbyqxmd.com/read/29127788/rapid-prediction-of-total-petroleum-hydrocarbons-concentration-in-contaminated-soil-using-vis-nir-spectroscopy-and-regression-techniques
#20
R K Douglas, S Nawar, M C Alamar, A M Mouazen, F Coulon
Visible and near infrared spectrometry (vis-NIRS) coupled with data mining techniques can offer fast and cost-effective quantitative measurement of total petroleum hydrocarbons (TPH) in contaminated soils. Literature showed however significant differences in the performance on the vis-NIRS between linear and non-linear calibration methods. This study compared the performance of linear partial least squares regression (PLSR) with a nonlinear random forest (RF) regression for the calibration of vis-NIRS when analysing TPH in soils...
November 8, 2017: Science of the Total Environment
keyword
keyword
90575
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"