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Spectral Analysis

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https://www.readbyqxmd.com/read/28806597/a-nested-multivariate-chemometrics-based-calibration-strategy-for-direct-trace-biometal-analysis-in-soft-tissue-utilizing-energy-dispersive-x-ray-fluorescence-edxrf-and-scattering-spectrometry
#1
REVIEW
J J Okonda, K H Angeyo, J M Mangala, S M Kisia
Compton scatter-modulated fluorescence and multivariate chemometric (artificial neural network (ANN) and principal component regression (PCR)) calibration strategy was explored for direct rapid trace biometals (Mn, Fe, Cu, Zn, Se) analysis in "complex" matrices (model soft tissues). This involved spectral feature selection (multiple fluorescence signatures) normalized to or in conjunction with Compton scatter. ANN model resulted in more accurate trace biometal determination (R(2)>0.9) compared to PCR. Hybrid nested (ANN and PCR) approach led to optimized accurate biometals' concentrations in Oyster tissue (≤ ± 10%)...
August 8, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28805618/prenatal-diagnosis-and-molecular-cytogenetic-characterization-of-mosaicism-for-a-small-supernumerary-marker-chromosome-derived-from-chromosome-21q11-2-q21-1-and-a-literature-review
#2
Chih-Ping Chen, Ming Chen, Chia-Hsun Wu, Chen-Ju Lin, Schu-Rern Chern, Peih-Shan Wu, Yen-Ni Chen, Shin-Wen Chen, Shun-Ping Chang, Li-Feng Chen, Wayseen Wang
OBJECTIVE: We present prenatal diagnosis and molecular cytogenetic characterization of mosaicism for a small supernumerary marker chromosome (sSMC) derived from chromosome 21q11.2-q21.1, and we review the literature of an sSMC(21) with a duplication of 21q11.2-q21.1. CASE REPORT: A 40-year-old woman underwent amniocentesis at 17 weeks of gestation because of advanced maternal age. Amniocentesis revealed a karyotype of 47,XX,+mar [18]/46,XX [4]. The parental karyotypes were normal...
August 2017: Taiwanese Journal of Obstetrics & Gynecology
https://www.readbyqxmd.com/read/28805612/detection-of-paternal-uniparental-disomy-9-in-a-neonate-with-prenatally-detected-mosaicism-for-a-small-supernumerary-marker-chromosome-9-and-a-supernumerary-ring-chromosome-9
#3
Chih-Ping Chen, Ming Chen, Liang-Kai Wang, Schu-Rern Chern, Peih-Shan Wu, Shin-Wen Chen, Shih-Ting Lai, Shun-Ping Chang, Chien-Wen Yang, Chen-Wen Pan, Wayseen Wang
OBJECTIVE: We present the association of paternal uniparental disomy (UPD) 9 with mosaicism for a small supernumerary marker chromosome 9 [sSMC(9)] and a supernumerary ring chromosome 9 [r(9)]. MATERIALS AND METHODS: A 38-year-old woman underwent amniocentesis at 17 weeks of gestation because of advanced maternal age. Amniocentesis revealed a karyotype of 47,XY,+mar [25]/48,XY,+mar,+r(9) [4]/47,XY,+r(9) [1]/46,XY [6]. The parental karyotypes were normal. Array comparative genomic hybridization (aCGH) of cultured amniocytes revealed a result of de novo 9p13...
August 2017: Taiwanese Journal of Obstetrics & Gynecology
https://www.readbyqxmd.com/read/28805079/nonlinear-recurrent-dynamics-and-long-term-nonstationarities-in-eeg-alpha-cortical-activity-implications-for-choosing-adequate-segment-length-in-nonlinear-eeg-analyses
#4
Alexander Cerquera, Madelon A Vollebregt, Martijn Arns
Nonlinear analysis of EEG recordings allows detection of characteristics that would probably be neglected by linear methods. This study aimed to determine a suitable epoch length for nonlinear analysis of EEG data based on its recurrence rate in EEG alpha activity (electrodes Fz, Oz, and Pz) from 28 healthy and 64 major depressive disorder subjects. Two nonlinear metrics, Lempel-Ziv complexity and scaling index, were applied in sliding windows of 20 seconds shifted every 1 second and in nonoverlapping windows of 1 minute...
August 1, 2017: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/28804453/delta-power-is-higher-and-more-symmetrical-in-ischemic-stroke-patients-with-cortical-involvement
#5
Chiara Fanciullacci, Federica Bertolucci, Giuseppe Lamola, Alessandro Panarese, Fiorenzo Artoni, Silvestro Micera, Bruno Rossi, Carmelo Chisari
A brain injury resulting from unilateral stroke critically alters brain functionality and the complex balance within the cortical activity. Such modifications may critically depend on lesion location and cortical involvement. Indeed, recent findings pointed out the necessity of applying a stratification based on lesion location when investigating inter-hemispheric balance in stroke. Here, we tested whether cortical involvement could imply differences in band-specific activity and brain symmetry in post stroke patients with cortico-subcortical and subcortical strokes...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28803263/carotenoids-from-the-extreme-halophilic-archaeon-haloterrigena-turkmenica-identification-and-antioxidant-activity
#6
Giuseppe Squillaci, Roberta Parrella, Virginia Carbone, Paola Minasi, Francesco La Cara, Alessandra Morana
Haloterrigena turkmenica was able to synthesize carotenoids when grown in halobacteria medium. These molecules have antioxidant properties and find application in food, cosmetic, and pharmaceutical fields. The carotenoids were extracted with methanol, separated by RP-HPLC, and identified by mass spectrometry and UV/Vis spectra analyses. The C50 carotenoids were the main pigments, and C30, C40, and C51 carotenoids were also detected. Seven geometric isomers were distinguished for bacterioruberin, monoanhydrobacterioruberin, and bisanhydrobacterioruberin...
August 12, 2017: Extremophiles: Life Under Extreme Conditions
https://www.readbyqxmd.com/read/28802715/elucidating-virus-entry-using-a-tetracysteine-tagged-virus
#7
REVIEW
Bjorn-Patrick Mohl, Polly Roy
Fluorescent tags constitute an invaluable tool in facilitating a deeper understanding of the mechanistic processes governing virus-host interactions. However, when selecting a fluorescent tag for in vivo imaging of cells, a number of parameters and aspects must be considered. These include whether the tag may affect and interfere with protein conformation or localization, cell toxicity, spectral overlap, photo-stability and background. Cumulatively, these constitute challenges to be overcome. Bluetongue virus (BTV), a member of the Orbivirus genus in the Reoviridae family, is a non-enveloped virus that is comprised of two architecturally complex capsids...
August 9, 2017: Methods: a Companion to Methods in Enzymology
https://www.readbyqxmd.com/read/28802395/changes-in-pediatric-tracheostomy-tubes-exposed-to-home-dishwashing
#8
David E Smolar, Brian Ho, Steven M Kent, C Anthony Hughes, Donald Mettenburg, Fredrick A Rueggeberg, Michael W Groves
OBJECTIVE: Determine the effects of household dishwashing on Tracheostomy Tube safety. INTRODUCTION: Tracheostomy tubes accumulate biofilms, which may limit their lifespan. Frequent cleaning of the tubes is a method for biofilm prevention. Cleaning practices vary widely. Some families prefer dishwashing of tubes, but its effects are currently unknown. We hypothesize that dishwashing has no significant effect on the physical properties of tracheostomy tubes and can be recommended as a safe way to clean tracheostomy tubes...
September 2017: International Journal of Pediatric Otorhinolaryngology
https://www.readbyqxmd.com/read/28802166/design-synthesis-and-%C3%AE-amylase-inhibitory-activity-of-novel-chromone-derivatives
#9
Parthiban Valentina, Kaliappan Ilango, Subhash Chander, Sankaranarayanan Murugesan
Quercetin is one of the naturally occurring polyphenol flavonoid predominantly known for antidiabetic activity. In the present study, by considering the structural requirements, twenty two novel chromone derivatives (5-26) as α-amylase inhibitor were designed and subsequently in silico evaluated for drug likeness behavior. Designed compounds were synthesized, characterized by spectral analysis and finally evaluated for the inhibition of α-amylase activity by in vitro assay. Tested compounds exhibited significant to weak activity with IC50 range of 12-125µM...
August 1, 2017: Bioorganic Chemistry
https://www.readbyqxmd.com/read/28801595/spectral-characteristics-of-voltage-sensitive-indocyanine-green-fluorescence-in-the-heart
#10
Regina Mačianskienė, Mantė Almanaitytė, Rimantas Treinys, Antanas Navalinskas, Rimantas Benetis, Jonas Jurevičius
Indocyanine green (ICG) fluorescent dye has been approved by the FDA for use in medical diagnostics. Recently, we demonstrated that ICG dye has voltage-sensitive properties with a dual-component (fast and slow) response in the Langendorff-perfused rabbit heart. Here, we extended our studies by showing the different spectral properties of both components for analysis of the fractional change in ICG fluorescence in response to voltage changes. We used light from four LEDs to obtain excitation; emission was measured using an EMCCD camera with band-pass filters and a spectrometer...
August 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28800550/protein-based-medicines-analysis-by-raman-spectroscopy-for-the-detection-of-counterfeits
#11
Klara Dégardin, Anne Desponds, Yves Roggo
Protein-based medicines, or large molecule medicines, are innovative products used to treat various diseases like hepatitis or cancer. This new generation of molecules are usually expensive, and thus represents an attractive target for the counterfeiters. Due to the complexity of their chemical structure, their analysis for counterfeit detection is more difficult than small molecule medicines. The aim of the article is to demonstrate that Raman spectroscopy and microscopy can be used for the fast analysis of counterfeits of protein-based medicines...
July 20, 2017: Forensic Science International
https://www.readbyqxmd.com/read/28799594/the-photoluminescence-thermal-properties-and-tunable-color-of-na1-xal1-2xsi1-2xo4-xce-3-tb-3-dy-3-via-energy-transfer-a-single-component-multicolor-emitting-phosphor
#12
Chengyi Xu, Yanhua Song, Hongxia Guan, Ye Sheng, Pingchuan Ma, Xiuqing Zhou, Zhan Shi, Haifeng Zou
A series of emission-tunable Na1-xAl1+2xSi1-2xO4:xCe(3+)/Tb(3+)/Dy(3+) phosphors were synthesized via a high temperature solid-state reaction method. Luminescence properties, energy transfer from Ce(3+) to Tb(3+) or Dy(3+) ions, color tuning and thermal stability were systematically investigated. Particularly, the charge compensating defect generated by doping of rare earth ions was remedied through Al(3+) substituted Si(4+). Meanwhile, the emission intensity was significantly improved. The presence and content of various elements were demonstrated through data combined with the crystallographic data from Rietveld refinements and the analysis of SEM and mapping for each element...
August 11, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28799041/synergistic-interface-behavior-of-strontium-adsorption-using-mixed-microorganisms
#13
Wenyuan Hu, Faqin Dong, Guangmin Yang, Xin Peng, Xiaojun Huang, Mingxue Liu, Jing Zhang
The proper handling of low-level radioactive waste is crucial to promote the sustainable development of nuclear power. Research into the mechanism for interactions between bacterium and radionuclides is the starting point for achieving successful remediation of radionuclides with microorganisms. Using Sr(II) as a simulation radionuclide and the mixed microorganisms of Saccharomyces cerevisiae and Bacillus subtilis as the biological adsorbent, this study investigates behavior at the interface between Sr(II) and the microorganisms as well as the mechanisms governing that behavior...
August 10, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28796601/time-dependent-behavior-of-microvascular-blood-flow-and-oxygenation-a-predictor-of-functional-outcomes
#14
Kasia Z Kuliga, Rodney Gush, Geraldine F Clough, Andrew J Chipperfield
OBJECTIVE: This study investigates the time-dependent behaviour and algorithmic complexity of low frequency, periodic oscillations in blood flux and oxygenation signals from the microvasculature. METHODS: Microvascular blood flux (BF) and oxygenation (OXY: oxyHb, deoxyHb, totalHb and SO2%) was recorded from 15 healthy young adult males using combined laser Doppler fluximetry and white light spectroscopy with local skin temperature clamped to 33C and during local thermal hyperaemia (LTH) at 43C...
August 7, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28795795/mass-defect-based-dimethyl-pyrimidinyl-ornithine-dipyro-tags-for-multiplex-quantitative-proteomics
#15
Dustin C Frost, Amanda R Buchberger, Lingjun Li
We have developed a novel amine-reactive mass defect-based chemical tag, dimethyl pyrimidinyl ornithine (DiPyrO), that is compact in size, is suitable for various biological samples, and enables highly multiplexed quantification of peptides at the MS1 level without increasing mass spectral complexity. The DiPyrO tag structure incorporates heavy isotopes in a variety of configurations to impart as much as 45.3 mDa or as little as 5.8 mDa per tag between labeled peptides. Notably, peptides containing lysine are labeled with two tags, doubling the imparted mass defect to up to 90...
August 10, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28794426/manipulating-magnetoelectric-properties-by-interfacial-coupling-in-la0-3sr0-7mno3-ba0-7sr0-3tio3-superlattices
#16
Haizhong Guo, Qingqing Li, Zhengzhong Yang, Kui-Juan Jin, Chen Ge, Lin Gu, Xu He, Xiaolong Li, Ruiqiang Zhao, Qian Wan, Jiesu Wang, Meng He, Can Wang, Huibin Lu, Yuping Yang, Guozhen Yang
Artificial superlattices constructed with ferromagnetic La0.7Sr0.3MnO3 layer and ferroelectric Ba0.7Sr0.3TiO3 layer were designed and fabricated on SrTiO3 substrates. An epitaxial growth with sharp interfaces between La0.7Sr0.3MnO3 and Ba0.7Sr0.3TiO3 layers was confirmed by scanning transmission electron microscopy and x-ray diffraction. An unambiguous charge transfer involving an electron transferring from the La0.7Sr0.3MnO3 layers to Ba0.7Sr0.3TiO3 layers (Mn(3+)→Mn(4+); Ti(4+)→Ti(3+)) across the interface were resolved by electron energy loss spectra analysis...
August 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28794194/induced-oscillations-in-turtle-cortex-are-coherent-at-the-mesoscale-of-population-activity-but-not-at-the-microscale-of-the-membrane-potential-of-neurons
#17
Mahmood Sayed Hoseini, Jeff Pobst, Nathaniel Caleb Wright, Wesley Clawson, Woodrow Shew, Ralf Wessel
Bursts of oscillatory neural activity have been hypothesized to be a core mechanism by which remote brain regions can communicate. Such hypothesis raises the question to what extent oscillations are coherent across spatially distant neural populations. To address this question, we obtained local field potential (LFP) and membrane potential recordings from the visual cortex of turtle in response to visual stimulation of the retina. The time-frequency analysis of these recordings revealed pronounced bursts of oscillatory neural activity and a large trial-to-trial variability in the spectral and temporal properties of the observed oscillations...
August 9, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28793891/characterizing-measles-transmission-in-india-a-dynamic-modeling-study-using-verbal-autopsy-data
#18
Stéphane Verguet, Edward O Jones, Mira Johri, Shaun K Morris, Wilson Suraweera, Cindy L Gauvreau, Prabhat Jha, Mark Jit
BACKGROUND: Decreasing trends in measles mortality have been reported in recent years. However, such estimates of measles mortality have depended heavily on assumed regional measles case fatality risks (CFRs) and made little use of mortality data from low- and middle-income countries in general and India, the country with the highest measles burden globally, in particular. METHODS: We constructed a dynamic model of measles transmission in India with parameters that were empirically inferred using spectral analysis from a time series of measles mortality extracted from the Million Death Study, an ongoing longitudinal study recording deaths across 2...
August 10, 2017: BMC Medicine
https://www.readbyqxmd.com/read/28793847/effects-of-electrode-deactivation-on-speech-recognition-in-multichannel-cochlear-implant-recipients
#19
Kara C Schvartz-Leyzac, Teresa A Zwolan, Bryan E Pfingst
OBJECTIVES: The objective of the current study is to evaluate how speech recognition performance is affected by the number of active electrodes that are turned off in multichannel cochlear implants. Several recent studies have demonstrated positive effects of deactivating stimulation sites based on an objective measure in cochlear implant processing strategies. Previous studies using an analysis of variance have shown that, on average, cochlear implant listeners' performance does not improve beyond eight active electrodes...
August 10, 2017: Cochlear Implants International
https://www.readbyqxmd.com/read/28793325/employment-of-single-diode-model-to-elucidate-the-variations-in-photovoltaic-parameters-under-different-electrical-and-thermal-conditions
#20
Fahmi F Muhammad, Mohd Y Yahya, Shilan S Hameed, Fakhra Aziz, Khaulah Sulaiman, Mariwan A Rasheed, Zubair Ahmad
In this research work, numerical simulations are performed to correlate the photovoltaic parameters with various internal and external factors influencing the performance of solar cells. Single-diode modeling approach is utilized for this purpose and theoretical investigations are compared with the reported experimental evidences for organic and inorganic solar cells at various electrical and thermal conditions. Electrical parameters include parasitic resistances (Rs and Rp) and ideality factor (n), while thermal parameters can be defined by the cells temperature (T)...
2017: PloS One
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