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https://www.readbyqxmd.com/read/29793200/influence-of-auxochrome-group-in-disperse-dyes-bearing-azo-groups-as-chromophore-center-in-the-biotransformation-and-molecular-docking-prediction-by-reductase-enzyme-implications-and-assessment-for-environmental-toxicity-of-xenobiotics
#1
Jefferson Honorio Franco, Bianca F da Silva, Elisangela Franciscon G Dias, Alexandre A de Castro, Teodorico C Ramalho, Maria Valnice Boldrin Zanoni
Synthetic azo dyes have increasingly become a matter of great concern as a result of the genotoxic and mutagenic potential of the products derived from azo dye biotransformation. This work evaluates the manner in which reducing enzymes produced by Escherichia coli (E. coli) act on three disperse dyes bearing azo groups, namely Disperse Red 73 (DR 73), Disperse Red 78 (DR 78), and Disperse Red 167 (DR 167). UV-Vis spectrophotometry, high-performance liquid chromatography with diode array detector (HPLC-DAD), and liquid chromatography mass spectrometry (LC-MS/MS) were applied towards the identification of the main products...
May 21, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29793183/environmental-radionuclides-as-contaminants-of-hpge-gamma-ray-spectrometers-monte-carlo-simulations-for-modane-underground-laboratory
#2
R Breier, V B Brudanin, P Loaiza, F Piquemal, P P Povinec, E Rukhadze, N Rukhadze, I Štekl
The main limitation in the high-sensitive HPGe gamma-ray spectrometry has been the detector background, even for detectors placed deep underground. Environmental radionuclides such as 40 K and decay products in the 238 U and 232 Th chains have been identified as the most important radioactive contaminants of construction parts of HPGe gamma-ray spectrometers. Monte Carlo simulations have shown that the massive inner and outer lead shields have been the main contributors to the HPGe-detector background, followed by aluminum cryostat, copper cold finger, detector holder and the lead ring with FET...
May 21, 2018: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/29791886/the-emission-of-btex-compounds-during-movement-of-passenger-car-in-accordance-with-the-nedc
#3
Dragan Adamović, Jovan Dorić, Mirjana Vojinović Miloradov, Savka Adamović, Sabolč Pap, Jelena Radonić, Maja Turk Sekulić
The results of the research in the field of benzene, toluene, ethylbenzene and xylene isomers (BTEX) concentrations in exhaust gases of spark ignition engines under different operating conditions are presented in this paper. The aim of this paper is to gain a clearer insight into the impact of different engine working parameters on the concentrations of BTEX. The experimental investigation has been performed on the SCHENCK 230 W test stand with the controlled IC engine. The engine operating points have been chosen based on the results of a simulation and they are considered as the typical driving conditions according to the New European Driving Cycle...
May 20, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29791407/stokes-polarimeter-performance-general-noise-model-and-analysis
#4
Nathan Hagen, Yukitoshi Otani
We calculate the photometric Stokes parameter covariance matrices and SNRs estimated by polarimeters exposed to general noise distributions, such as mixed Poisson-Gaussian (PG) noise. The measurement model includes the effects of optical losses and detector quantum efficiency, enabling quantitative comparison of instruments that have different photometric efficiencies. We demonstrate this capability by comparing the performance of many common polarimeter configurations, including diattenuator-based systems, such as Azzam's four-detector polarimeter [Opt...
May 20, 2018: Applied Optics
https://www.readbyqxmd.com/read/29791375/tunable-double-mode-sensor-for-multi-gas-detection-based-on-the-external-cavity-diode-laser
#5
Ismail Bayrakli
An optoelectronic sensor system based on a thermoelectrically cooled (TEC) continuous-wave (CW) double-mode external-cavity diode laser (ECDL) is demonstrated for a multi-gas analysis in this paper. An ECDL that can simultaneously emit at two different wavelengths in the range from 1275 to 1340 nm was utilized as the excitation source for molecule absorption. Each wavelength can be independently tuned. The ECDL was combined with an off-axis cavity-enhanced absorption spectroscopy (OA-CEAS) cell to perform multi-gas sensing...
May 20, 2018: Applied Optics
https://www.readbyqxmd.com/read/29791370/band-optimization-of-passive-methane-gas-leak-detection-based-on-uncooled-infrared-focal-plane-array
#6
Zhang Xu, Weiqi Jin, Li Li, Xia Wang, Ji Chen, YuChao Jia
Current methane gas leak detection technology uses infrared imaging in the medium wave (MW) or long wave (LW) bands, essentially applying cooled infrared detectors. In this study, a simplified three-layer radiative transfer model is adopted based on methane gas detection theory, considering background radiation, atmospheric infrared absorption, gas absorption, and emission characteristics to analyze the contrast of methane gas thermography in different infrared bands. The analysis results suggest that under certain conditions, the 6...
May 20, 2018: Applied Optics
https://www.readbyqxmd.com/read/29791367/improved-space-object-detection-using-short-exposure-image-data-with-daylight-background
#7
David Becker, Stephen Cain
Space object detection is of great importance in the highly dependent yet competitive and congested space domain. The detection algorithms employed play a crucial role in fulfilling the detection component in the space situational awareness mission to detect, track, characterize, and catalog unknown space objects. Many current space detection algorithms use a matched filter or a spatial correlator on long-exposure data to make a detection decision at a single pixel point of a spatial image based on the assumption that the data follow a Gaussian distribution...
May 10, 2018: Applied Optics
https://www.readbyqxmd.com/read/29791358/partial-saturation-aided-resolution-enhancement-for-digital-holography
#8
Zhilong Jiang, Xingchen Pan, Yan Kong, Weiying Qian, Shouyu Wang, Cheng Liu
Because of the limited dynamic range of common detectors, high-frequency components weaker than the threshold of the detector used are lost in digital holography (DH) even with the aid of coherent diffraction imaging (CDI)-based iterative computation, and this makes DH less preferable for many interesting applications. To overcome this problem, the partially saturated diffraction pattern was adopted to enhance the resolution of DH iteratively. Since more high-frequency components were retrieved in comparison with our former CDI-based digital holographic method, the resolution of DH was improved further...
May 10, 2018: Applied Optics
https://www.readbyqxmd.com/read/29791340/design-of-a-delayed-xor-phase-detector-for-an-optical-phase-locked-loop-toward-high-speed-coherent-laser-communication
#9
Yang Liu, Shoufeng Tong, Shuai Chang, Yansong Song, Yan Dong, Xin Zhao, Zhe An, Fuwan Yu
Optical phase-locked loops are an effective detection method in high-speed and long-distance laser communication. Although this method can detect weak signal light and maintain a small bit error rate, it is difficult to perform because identifying the phase difference between the signal light and the local oscillator accurately has always been a technical challenge. Thus, a series of studies is conducted to address this issue. First, a delayed exclusive or gate (XOR) phase detector with multi-level loop compound control is proposed...
May 10, 2018: Applied Optics
https://www.readbyqxmd.com/read/29791333/modeling-of-microjoule-and-millijoule-energy-lidars-with-pmt-sipm-apd-detectors-a-sensitivity-analysis
#10
Ravil Agishev
This paper demonstrates a renewed concept and applications of the generalized methodology for atmospheric light detection and ranging (LIDAR) capability prediction as a continuation of a series of our previous works, where the dimensionless parameterization appeared as a tool for comparing systems of a different scale, design, and applications. The modernized concept applied to microscale and milliscale LIDARs with relatively new silicon photomultiplier detectors and traditional photomultiplier tube and avalanche photodiode detectors allowed prediction of the remote sensing instruments' performance and limitations...
May 10, 2018: Applied Optics
https://www.readbyqxmd.com/read/29791312/african-crocus-curculigo-pilosa-and-wonderful-kola-buchholzia-coriacea-seeds-modulate-critical-enzymes-relevant-to-erectile-dysfunction-and-oxidative-stress
#11
Stephen A Adefegha, Sunday I Oyeleye, Ganiyu Oboh
Background The seeds of African crocus (AC) (Curculigo pilosa) and wonderful kola (WK) (Buchholzia coriacea) are commonly used in folklore medicine in managing erectile dysfunction (ED) without the full understanding of the possible mechanism of actions. This study investigated and compared the effects of aqueous extracts from the seeds of AC and WK on arginase and acetylcholinesterase (AChE) activities and some pro-oxidant [FeSO4 and sodium nitroprusside (SNP)]-induced lipid peroxidation in rat penile homogenate in vitro...
May 23, 2018: Journal of Complementary & Integrative Medicine
https://www.readbyqxmd.com/read/29790507/a-novel-liquid-chromatography-detector-based-on-a-dielectric-barrier-discharge-molecular-emission-spectrometer-with-online-microwave-assisted-hydrolysis-for-determination-of-dithiocarbamates
#12
Bingjun Han, Ya Li, Bing Qian, Yan He, Lixu Peng, Huamei Yu
A novel detector for liquid chromatography (LC) for the determination of dithiocarbamate (DTC) fungicides is presented with a miniaturized dielectric barrier discharge-microplasma molecular emission spectrometer and an online microwave-assisted hydrolysis reactor. DTCs in the sample/standard solutions together with SnCl2 were pumped to the reactor to be converted to CS2 with high efficiency, which was then separated from the liquid phase and transformed for the detection of the specific molecular emission at 257...
May 23, 2018: Analyst
https://www.readbyqxmd.com/read/29790486/-simplicity-or-complexity-of-the-radiopharmaceutical-production-process-in-the-light-of-optimization-of-radiation-protection-of-staff-sup-99m-sup-tc-vs-sup-18-sup-f
#13
Małgorzata Wrzesień
BACKGROUND: A radiopharmaceutical is a combination of a non-radioactive compound with a radioactive isotope. Two isotopes: technetium- 99m (<sup>99m</sup>Tc) and fluorine-18 (<sup>18</sup>F) are worth mentioning on the rich list of isotopes which have found numerous medical applications. Their similarity is limited only to the diagnostic area of applicability. The type and the energy of emitted radiation, the half-life and, in particular, the production method demonstrate their diversity...
May 22, 2018: Medycyna Pracy
https://www.readbyqxmd.com/read/29790345/characterization-of-the-major-odor-active-compounds-in-dry-jujubes-cultivars-by-application-of-gas-chromatography-olfactometry-and-odor-activity-value
#14
Zuobing Xiao, Jiancai Zhu
The volatile compounds of jujube (Ziziphus jujube Mill.) puree obtained from three cultivars: 'jinsixiaozao' (Y1), 'youzao' (Y2), and 'yuzao' (Y3) were analyzed by gas chromatography-olfactometry (GC-O), gas chromatography-mass spectrometry, GC-flame photometric detection, and nitrogen phosphorus detector. The results showed that a total of 37, 37, and 35 odor-active compounds were identified by GC-O in samples of Y1, Y2, and Y3, respectively. In addition, the odor activity value (OAV) was used to determine the important compounds...
May 23, 2018: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29790319/wideband-linear-detector-arrays-for-optoacoustic-imaging-based-on-polyvinylidene-difluoride-films
#15
Pavel Subochev, Maxim Prudnikov, Vladimir Vorobyev, Anna Postnikova, Egor Sergeev, Valeria Perekatova, Anna Orlova, Valentina Kotomina, Ilya Turchin
We provide direct experimental comparison of the optoacoustic imaging performance of two different 64-element linear detector array (LDA) units based on polyvinylidene difluoride (PVDF) films. The first LDA unit was based on traditional flexible circuit (FC) technology and consisted of an FC glued to the nonmetalized signal surface of a 28-μm-thick PVDF film providing 300  /  80-μm axial resolution/lateral resolution (AR/LR) and 0.4-kPa noise equivalent pressure of its single element. The other LDA unit was manufactured using a technology of low-temperature photolithographic etching (PE) of a signal electrode onto a 25-μm-thick PVDF film providing 300  /  40-μm AR/LR and 1 kPa noise equivalent pressure...
May 2018: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29790261/-characterization-of-elekta-srs-cone-collimator-using-high-spatial-resolution-monolithic-silicon-detector-array
#16
Khalsa Al Shukaili, Stéphanie Corde, Marco Petasecca, Vladimir Pereveratylo, Michael Lerch, Michael Jackson, Anatoly Rosenfeld
PURPOSE: To investigate the accuracy of the dosimetry of radiation fields produced by small ELEKTA cone collimators used for stereotactic radiosurgery treatments (SRS) using commercially available detectors EBT3 GafchromicTM film, IBA Stereotactic diode (SFD), and the recently developed detector DUO, which is a monolithic silicon orthogonal linear diode array detector. METHODS: These three detectors were used for the measurement of beam profiles, output factors, and percentage depth dose for SRS cone collimators with cone sizes ranging from 5 to 50 mm diameter...
May 22, 2018: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29790069/antidepressant-effects-of-the-ginsenoside-metabolite-compound-k-assessed-by-behavioral-despair-test-and-chronic-unpredictable-mild-stress-model
#17
Wu Song, Yan Guo, Shuang Jiang, Lin Wei, Zhi Liu, Xiaoyan Wang, Ying Su
Depression is a major social and health problem worldwide. Compound K (CK), an intestinal metabolite of panaxadiol ginsenosides, has been demonstrated to possess significant pharmacological effects on the central nervous system (CNS). Here, we set up this study to investigate the antidepressant effect of CK, and to explore the potential mechanisms underlying this activity. The behavioral despair model and chronic unpredictable mild stress (CUMS) model were established in mice or rats, respectively. Forced swimming test (FST), tail suspension test (TST) and locomotor activity were performed in mice, while the open-field test, food consumption and sucrose preference were assessed in rats...
May 22, 2018: Neurochemical Research
https://www.readbyqxmd.com/read/29789970/motile-dendritic-cells-sense-and-respond-to-substrate-geometry
#18
Amy C Bendell, Nicholas Anderson, Daniel Blumenthal, Edward K Williamson, Christopher S Chen, Janis K Burkhardt, Daniel A Hammer
Dendritic cell (DC) migration is required for efficient presentation of antigen to T cells and the initiation of an adaptive immune response. In spite of its importance, many aspects of DC migration have not been characterized. DCs encounter a variety of environments with different stiffness and geometry, but the effect of these parameters on DC migration has not yet been determined. We addressed this question by comparing DC motility on standard migration surfaces (polydimethylsiloxane (PDMS)-coated coverslips) and micropost array detectors (mPADs)...
May 22, 2018: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/29789908/triple-rule-out-ct-angiography-using-two-axial-scans-with-16-cm-wide-detector-for-radiation-dose-reduction
#19
Yuhuan Chen, Qi Wang, Jianying Li, Yongjun Jia, Qi Yang, Taiping He
OBJECTIVE: To explore the use of two consecutive axial scans in triple-rule-out (TRO) examination on a 16 cm wide-detector CT for radiation dose reduction. MATERIALS AND METHODS: Sixty TRO patients were assigned to either study group (Group A, n = 30) or control group (Group B, n = 30). Group A used a two-phasic contrast injection: 25mgI/kg/s for 12 s in 1st and at 3.0 ml/s injection rate for 7 s in 2nd phase. The pulmonary artery, coronary artery and aorta were scanned in succession with two axial scans using smart-coverage technique...
May 22, 2018: European Radiology
https://www.readbyqxmd.com/read/29789896/an-offline-technique-to-evaluate-residual-motion-of-the-diaphragm-during-deep-inspiratory-breath-hold-from-cone-beam-ct-datasets
#20
Manuel Blessing, Julian Hofmann, Lena Vogel, Judit Boda-Heggemann, Frank Lohr, Frederik Wenz, Florian Stieler, Anna Simeonova-Chergou
PURPOSE: In radiation therapy, the computer-assisted deep inspiration breath-hold (DIBH) technique is one approach to deal with respiratory motion of tumors in the lung, liver, or upper abdomen. However, inter- and intra-breath-hold deviations from an optimal static tumor position might occur. A novel method is presented to noninvasively measure the diaphragm position and thus estimate its residual deviation (as surrogate for the tumor position) based on cone-beam computed tomography (CBCT) projection data using active breathing control during acquisition...
May 22, 2018: Strahlentherapie und Onkologie: Organ der Deutschen Röntgengesellschaft ... [et Al]
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