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Nearinfrared spectroscopy

Ingo Helmich, Alisa Berger, Hedda Lausberg
INTRODUCTION: Postural instability has been shown to characterize individuals who suffered from long-term symptoms after mild traumatic brain injury. However, recordings of neural processes during postural control are difficult to realize with standard neuroimaging techniques. Thus, we used functional nearinfrared spectroscopy to investigate brain oxygenation of individuals with persistent postconcussion symptoms (pPCS) during postural control in altered environments. METHODS: We compared brain oxygenation and postural sway during balance control in three groups: individuals suffering from pPCS, individuals with a history of mild traumatic brain injury but without pPCS, and healthy controls...
December 2016: Medicine and Science in Sports and Exercise
T Yano, R Afroundeh, K Shirakawa, C-S Lian, K Shibata, Z Xiao, T Yunoki
The purpose of the present study was to examine how oscillation of tissue oxygen index (TOI) in non-exercising exercise is affected during high-intensity and low-intensity exercises. Three exercises were performed with exercise intensities of 30% and 70% peak oxygen uptake (Vo(2)peak) for 12 min and with exercise intensity of 70% Vo(2)peak for 30 s. TOI in non-exercising muscle (biceps brachii) during the exercises for 12 min was determined by nearinfrared spectroscopy. TOI in the non-exercising muscle during the exercises was analyzed by fast Fourier transform (FFT) to obtain power spectra density (PSD)...
September 2015: Acta Physiologica Hungarica
Lian Song, Ji Jian, De-Jun Tan, Hong-Bin Xie, Zhen-Fu Luo, Bo Gao
In the present paper, Chongqing Wansheng mining area was selected as the study area, and the ASD FieldSpec Pro III portable spectroradiometer (350 to 2,500 nm) was used as the spectral measurement instrument to collect the reflectance spectra of 171 soil samples and 123 soil samples in March and in August 2012 respectively. In order to create the retrieval model to retrieve soil heavy metal concentration, 40 among the 123 soil samples in August 2012 were collected to do chemical analysis. Then, the heavy metals' concentration and the reflectance of the 40 soil samples were analyzed together...
March 2014: Guang Pu Xue Yu Guang Pu Fen Xi, Guang Pu
Jelena M Janjic, Pin Shao, Shaojuan Zhang, Xun Yang, Sravan K Patel, Mingfeng Bai
Bimodal imaging agents that combine magnetic resonance imaging (MRI) and nearinfrared (NIR) imaging formulated as nanoemulsions became increasingly popular for imaging inflammation in vivo. Quality of in vivo imaging using nanoemulsions is directly dependent on their integrity and stability. Here we report the design of nanoemulsions for bimodal imaging, where both photostability and colloidal stability are equally addressed. A highly chemically and photo stable quaterrylenediimide dye was introduced into perfluoro-15-crown-5 ether (PCE) nanoemulsions...
June 2014: Biomaterials
A Yavari, A Heshmati, M Hamedi, S Haghbin
This article has been retracted: please see Elsevier Policy on Article Withdrawal ( This article has been retracted at the request of the Editor-in-Chief. The authors have plagiarized significant parts of a thesis published online in 2005: Quality Evaluation of Frying Oil and Chicken Nuggets Using Visible/Nearinfrared Hyper-spectral Analysis by Samira Kazemi Sangdehi (
July 15, 2011: Food Chemistry
Fulan Xie, Nian Yao, Yao Qin, Qianyu Zhang, Huali Chen, Mingqing Yuan, Jie Tang, Xiankun Li, Wei Fan, Qiang Zhang, Yong Wu, Li Hai, Qin He
BACKGROUND: An intimidating challenge to transporting drugs into the brain parenchyma is the presence of the blood-brain barrier (BBB). Glucose is an essential nutritional substance for brain function sustenance, which cannot be synthesized by the brain. Its transport primarily depends on the glucose transporters on the brain capillary endothelial cells. In this paper, the brain-targeted properties of glucose-modified liposomes using polyethylene glycols with different chain lengths as the linkers were compared and evaluated to establish an optimized drug-delivery system...
2012: International Journal of Nanomedicine
H Riris, C B Carlisle, R E Warren
A recursive Kalman time-series filter was applied to absorbance measurements obtained with a tunable diode laser spectrometer. The spectrometer uses frequency modulation spectroscopy and a nearinfrared diode laser operating at 1.604 µm to monitor the CO(2)-vapor concentration in a 30-cm absorption cell. The Kalman filter enhanced the signal-to-noise ratio of the spectrometer by an order of magnitude when an absorbance of 6 × 10(-5) was monitored.
August 20, 1994: Applied Optics
Daniel Doerr, Martin Stark, Friederike Ehrhart, Heiko Zimmermann, Frank Stracke
In this study we demonstrate a new noninvasive imaging method to monitor freezing processes in biological samples and to investigate life in the frozen state. It combines a laser scanning microscope with a computer-controlled cryostage. Nearinfrared (NIR) femtosecond laser pulses evoke the fluorescence of endogenous fluorophores and fluorescent labels due to multiphoton absorption.The inherent optical nonlinearity of multiphoton absorption allows 3D fluorescence imaging for optical tomography of frozen biological material in-situ...
August 2009: Biotechnology Journal
Y L Lo, H H Zhang, C C Wang, Z Y Chin, S Fook-Chong, C Gabriel, C T Guan
In overt reading and singing tasks, actual vocalization of words in a rhythmic fashion is performed. During execution of these tasks, the role of underlying vascular processes in relation to cortical excitability changes in a spatial manner is uncertain. Our objective was to investigate cortical excitability changes during reading and singing with transcranial magnetic stimulation (TMS), as well as vascular changes with nearinfrared spectroscopy (NIRS). Findings with TMS and NIRS were correlated. TMS and NIRS recordings were performed in 5 normal subjects while they performed reading and singing tasks separately...
January 2009: Motor Control
Yan-de Liu, Yi-bin Ying, Xia-ping Fu
The nondestructive method for quantifying sugar content (SC) and available acid (VA) of intact apples using diffuse near infrared reflectance and optical fiber sensing techniques were explored in the present research. The standard sample sets and prediction models were established by partial least squares analysis (PLS). A total of 120 Shandong Fuji apples were tested in the wave number of 12,500 - 4000 cm(-1) using Fourier transform near infrared spectroscopy. The results of the research indicated that the nondestructive quantification of SC and VA, gave a high correlation coefficient 0...
November 2005: Guang Pu Xue Yu Guang Pu Fen Xi, Guang Pu
Qing-ge Liu, Shu-jian Li, Xue-shan Li
The authors utilized a multi-scale edge extraction method to extract feature information of nearinfrared spectroscopy. Applying partial least-squares to charactcristic data obtained, the authors set up a linear mathematical model of the correlation between NIR spectrum and metronidazole contents. The result shows that the multi-scale extraction method can separate and extract feature information, and can be seen as an effective method of spectrum information extraction. The present study offers a new solution to the problems in nearinfrared spectroscopy technology...
June 2005: Guang Pu Xue Yu Guang Pu Fen Xi, Guang Pu
B M Mackert
The non-invasive electrical recording of Direct Current (DC) phenomena in the frequency range below 0.1 Hz, e.g., occurring in metabolic injuries to brain cells in stroke or migraine (anoxic depolarization, peri-infarct depolarization, spreading depression), is technically restricted due to large drift artifacts caused by electrochemical instabilities at the electrode-skin interface. This limitation could be overcome by invasive approaches only. However, as early as 1969 first magnetic fields in this frequency range have been recorded over the human torso by oscillating the subject vertically in front of a magnetic field detector using a see-saw...
2004: Neurology & Clinical Neurophysiology: NCN
Frank Syré, Hellmuth Obrig, Jens Steinbrink, Matthias Kohl, Rüdiger Wenzel, Arno Villringer
The potential of near infrared spectroscopy (NIRS) to detect vascular changes in cerebral cortical tissue elicited by functional stimulation has been established (1). The vascular response is considered the result of neuronal activity in the investigated area and forms the basis of imaging techniques such as BOLD-contrast fMRI and PET. In the animal optical methods have been shown to detect optical changes in the illuminated tissue which exactly follow the time course of electrical potential changes, thus optical techniques can potentially assess both the 'fast' neuronal and the 'slow' vascular response...
2003: Advances in Experimental Medicine and Biology
Y Morimoto, W Durante, D G Lancaster, J Klattenhoff, F K Tittel
Carbon monoxide (CO) has been implicated as a biological messenger molecule analogous to nitric oxide. A compact gas sensor based on a midinfrared laser absorption spectroscopy was developed for direct and real-time measurement of trace levels (in approximate pmol) of CO release by vascular cells. The midinfrared light is generated by difference frequency mixing of two nearinfrared lasers in a nonlinear optical crystal. A strong infrared absorption line of CO (4.61 microm) is chosen for convenient CO detection without interference from other gas species...
January 2001: American Journal of Physiology. Heart and Circulatory Physiology
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