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https://www.readbyqxmd.com/read/28647148/monolithic-capillary-column-with-an-integrated-electrochemical-detector
#1
Martina Komendová, Radovan Metelka, Jiří Urban
The carbon fiber and silver microwire were used as working and pseudoreference electrode, respectively, and inserted into the ending of capillary to prepare monolithic capillary column with an integrated electrochemical detector. Prepared capillary devices offered stable and robust results with relative standard deviations of retention, resolution, and detection signal lower than 1.5, 5.5, and 5.0%, respectively. To further increase sensitivity of developed electrochemical microdetector, multiple pulse amperometry detection mode has been used...
June 19, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28646835/association-between-blood-cholinesterase-activity-organophosphate-pesticide-residues-on-hands-and-health-effects-among-chili-farmers-in-ubon-ratchathani-province-northeastern-thailand
#2
Thitirat Nganchamung, Mark G Robson, Wattasit Siriwong
Background: Use of pesticides has been documented to lead to several adverse health effects. Farmers are likely to be exposed to pesticides through dermal exposure as a result of mixing, loading, and spraying. Organophosphate pesticides (OPs) are widely used in most of the agricultural areas throughout Thailand. OPs are cholinesterase inhibitors and blood cholinesterase activity is used as a biomarker of OP effects. Objective: This study aims to determine the association between blood cholinesterase activity and organophosphate pesticide residues on chili farmer’s hands and their adverse health effects...
2017: Roczniki Państwowego Zakładu Higieny
https://www.readbyqxmd.com/read/28646721/biochemical-immunological-hybrid-biosensor-based-on-two-dimensional-chromatography-for-on-site-sepsis-diagnosis
#3
Seung-Wan Kim, Il-Hoon Cho, Guei-Sam Lim, Gi-Na Park, Se-Hwan Paek
A hybrid-biosensor system that can simultaneously fulfill the immunoassay for protein markers (e.g., C-reactive protein (CRP) and procalcitonin (PCT)) and the enzyme assay for metabolic substances (e.g., lactate) in the same sepsis-based sample has been devised. Such a challenge was pursued through the installation of an enzyme-reaction zone on the signal pad of the typical immuno-strip for the rapid two-dimensional (2-D)-chromatography test. To minimize the mutual interference in the hybrid assays, a pre-determined membrane site was etched in a pattern and mounted with a biochemical-reaction pad, thereby allowing a loaded sample to enter and then stay in the pad for a colored-signal production over the course of an immunoassay...
June 16, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28646653/cryo-em-beyond-the-microscope
#4
REVIEW
Lesley A Earl, Veronica Falconieri, Jacqueline Ls Milne, Sriram Subramaniam
The pace at which cryo-EM is being adopted as a mainstream tool in structural biology has continued unabated over the past year. Initial successes in obtaining near-atomic resolution structures with cryo-EM were enabled to a large extent by advances in microscope and detector technology. Here, we review some of the complementary technical improvements that are helping sustain the cryo-EM revolution. We highlight advances in image processing that permit high resolution structure determination even in the presence of structural and conformational heterogeneity...
June 21, 2017: Current Opinion in Structural Biology
https://www.readbyqxmd.com/read/28645509/a-fast-and-reliable-method-for-daily-quality-assurance-in-spot-scanning-proton-therapy-with-a-compact-and-inexpensive-phantom
#5
Nicola Bizzocchi, Francesco Fracchiolla, Marco Schwarz, Carlo Algranati
In a radiotherapy center, daily quality assurance (QA) measurements are performed to ensure that the equipment can be safely used for patient treatment on that day. In a pencil beam scanning (PBS) proton therapy center, spot positioning, spot size, range, and dose output are usually verified every day before treatments. We designed, built, and tested a new, reliable, sensitive, and inexpensive phantom, coupled with an array of ionization chambers, for daily QA that reduces the execution times while preserving the reliability of the test...
June 20, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/28644901/vascular-geometry-as-a-risk-factor-for-non-penetrating-traumatic-injuries-of-the-aortic-arch
#6
Andreas Schicho, Lukas Luerken, Christian Stroszczynski, Ramona Meier, Andreas G Schreyer, Lena-Marie Dendl, Stephan Schleder
PURPOSE: To assess biomechanical factors in aortic arch geometry contributing to the development of non-penetrating aortic arch injury (NAAI) in multiply injured patients with an Injury Severity Score (ISS) ≥ 16. MATERIAL AND METHODS: 230 consecutive multiply injured trauma patients with an ISS ≥ 16 admitted to our Level-I trauma center during a consecutive 24-month period were prospectively included of whom 13 presented with NAAI (5.7%). Standardized whole-body CT in a 2x128-detector-row scanner included a head-and-neck CTA...
2017: PloS One
https://www.readbyqxmd.com/read/28644820/investigation-of-real-tissue-water-equivalent-path-lengths-using-an-efficient-dose-extinction-method
#7
Rongxiao Zhang, Esther Baer, Kyung-Wook Jee, Gregory C Sharp, Jay Flanz, Hsiao-Ming Lu
For proton therapy, an accurate conversion of CT HU to relative stopping power (RSP) is essential. Validation of the conversion based on real tissue samples is more direct than the current practice solely based on tissue substitutes and can potentially address variations over the population. Based on a novel dose extinction method, we measured water equivalent path lengths (WEPL) on animal tissue samples to evaluate the accuracy of CT HU to RSP conversion and potential variations over a population. A broad proton beam delivered a spread out Bragg peak to the samples sandwiched between a water tank and a 2D ion-chamber detector...
June 23, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28644812/a-self-adaptive-capacitive-compensation-technique-for-body-channel-communication
#8
Jingna Mao, Huazhong Yang, Yong Lian, Bo Zhao
In wireless body area network, capacitive-coupling body channel communication (CC-BCC) has the potential to attain better energy efficiency over conventional wireless communication schemes. The CC-BCC scheme utilizes the human body as the forward signal transmission medium, reducing the path loss in wireless body-centric communications. However, the backward path is formed by the coupling capacitance between the ground electrodes (GEs) of transmitter (Tx) and receiver (Rx), which increases the path loss and results in a body posture dependent backward impedance...
June 20, 2017: IEEE Transactions on Biomedical Circuits and Systems
https://www.readbyqxmd.com/read/28644375/gaden-a-3d-gas-dispersion-simulator-for-mobile-robot-olfaction-in-realistic-environments
#9
Javier Monroy, Victor Hernandez-Bennets, Han Fan, Achim Lilienthal, Javier Gonzalez-Jimenez
This work presents a simulation framework developed under the widely used Robot Operating System (ROS) to enable the validation of robotics systems and gas sensing algorithms under realistic environments. The framework is rooted in the principles of computational fluid dynamics and filament dispersion theory, modeling wind flow and gas dispersion in 3D real-world scenarios (i.e., accounting for walls, furniture, etc.). Moreover, it integrates the simulation of different environmental sensors, such as metal oxide gas sensors, photo ionization detectors, or anemometers...
June 23, 2017: Sensors
https://www.readbyqxmd.com/read/28643838/organics-filled-one-dimensional-tio2-nanowires-array-ultraviolet-detector-with-enhanced-photo-conductivity-and-dark-resistivity
#10
Dezhong Zhang, Chunyu Liu, Bo Yin, Ruiliang Xu, Jingran Zhou, Xindong Zhang, Shengping Ruan
A heterojunction photo-conductive ultraviolet (UV) detector was developed based on TiO2 nanowires array (NWA) surrounded by N,N'-bis-(1-naphthalenyl)-N,N'-bis-phenyl-(1,1'-biphenyl)-4,4'-diamine (NPB). The novel and effective two-step method of static infusion and dynamic solution-cleaning was employed to fill NPB into TiO2 NWA gaps and simultaneously remove the unwelcomed top NPB layer. The device fabricated via the two-step method exhibited optimal performance compared to TiO2/NPB device with top NPB layer and TiO2 NWA device...
June 23, 2017: Nanoscale
https://www.readbyqxmd.com/read/28643753/dosimetric-characteristic-of-physical-wedge-versus-enhanced-dynamic-wedge-based-on-monte-carlo-simulations
#11
Seied Rabie Mahdavi, Ghazale Geraily, Ahmad Mostaar, Arman Zia, Golbarg Esmaili, Somayeh Farahani
AIM OF STUDY: Physical wedges (PWs) are widely used in radiotherapy to obtain tilted isodose curves, but they alter beam quality. Dynamic wedges (DWs) using moving collimator overcome this problem, but measuring their beam data is not simple. The main aim of this study is to obtain all dosimetric parameters of DWs produced by Varian 2100CD with Monte Carlo simulation and compare them to those from PWs. SUBJECTS AND METHODS: To simulate 6 MV photon beams equipped with PW and DW, BEAMnrc code was used...
April 2017: Journal of Cancer Research and Therapeutics
https://www.readbyqxmd.com/read/28643516/untargeted-comprehensive-two-dimensional-liquid-chromatography-coupled-with-high-resolution-mass-spectrometry-analysis-of-rice-metabolome-using-multivariate-curve-resolution
#12
Meritxell Navarro-Reig, Joaquim Jaumot, Anna Baglai, Gabriel Vivó-Truyols, Peter J Schoenmakers, Romà Tauler
In this work, a new strategy for the chemometric analysis of LC×LC-HRMS data is proposed. This approach consists of a preliminary compression step along the MS spectral dimension based on the selection of the Regions of Interest (ROI), followed by a further data compression along the chromatographic dimension by wavelet transforms. In a secondary step, the Multivariate Curve Resolution Alternating Least Squares (MCR-ALS) method is applied to previously compressed data sets obtained in the simultaneous analysis of multiple LC×LC-HRMS chromatographic runs from multiple samples...
June 23, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28641460/variability-in-strength-of-red-yeast-rice-supplements-purchased-from-mainstream-retailers
#13
Pieter A Cohen, Bharathi Avula, Ikhlas A Khan
The United States Food and Drug Administration (FDA) has introduced manufacturing standards for dietary supplements, including red yeast rice, to assure their identity, purity, strength, and composition. One supplement commonly used to self-treat high cholesterol, red yeast rice, may contain monacolin K, an ingredient identical to prescription lovastatin. We examined whether FDA's manufacturing standards led to standard concentrations of the statin monacolin K in red yeast rice supplements. We analyzed 28 brands of red yeast rice supplements by ultra-high performance liquid chromatography-diode array detector-quadrupole time-of-flight mass spectrometry for monacolin K content...
January 1, 2017: European Journal of Preventive Cardiology
https://www.readbyqxmd.com/read/28641319/understanding-scuba-diving-fatalities-carbon-dioxide-concentrations-in-intra-cardiac-gas
#14
Vincent Varlet, Alejandro Dominguez, Marc Augsburger, Maisy Lossois, Coraline Egger, Cristian Palmiere, Raquel Vilarino, Silke Grabherr
INTRODUCTION: Important developments in the diagnosis of scuba diving fatalities have been made thanks to forensic imaging tool improvements. Multi-detector computed tomography (MDCT) permits reliable interpretation of the overall gaseous distribution in the cadaver. However, due to post-mortem delay, the radiological interpretation is often doubtful because the distinction between gas related to the dive and post-mortem decomposition artifactual gases becomes less obvious. METHODS: We present six cases of fatal scuba diving showing gas in the heart and other vasculature...
June 2017: Diving and Hyperbaric Medicine: the Journal of the South Pacific Underwater Medicine Society
https://www.readbyqxmd.com/read/28641271/joint-attributes-and-event-analysis-for-multimedia-event-detection
#15
Zhigang Ma, Xiaojun Chang, Zhongwen Xu, Nicu Sebe, Alexander G Hauptmann
Semantic attributes have been increasingly used the past few years for multimedia event detection (MED) with promising results. The motivation is that multimedia events generally consist of lower level components such as objects, scenes, and actions. By characterizing multimedia event videos with semantic attributes, one could exploit more informative cues for improved detection results. Much existing work obtains semantic attributes from images, which may be suboptimal for video analysis since these image-inferred attributes do not carry dynamic information that is essential for videos...
June 15, 2017: IEEE Transactions on Neural Networks and Learning Systems
https://www.readbyqxmd.com/read/28640882/quantitation-of-underivatized-branched-chain-amino-acids-in-sport-nutritional-supplements-by-capillary-electrophoresis-with-direct-or-indirect-uv-absorbance-detection
#16
Jun Qiu, Jinhao Wang, Zhongqi Xu, Huiqing Liu, Jie Ren
The branched-chain amino acids (BCAAs) including leucine (Leu), isoleucine (Ile) and valine (Val) play a pivotal role in the human body. Herein, we developed capillary electrophoresis (CE) coupled with conventional UV detector to quantify underivatized BCAAs in two kinds of sport nutritional supplements. For direct UV detection at 195 nm, the BCAAs (Leu, two enantiomers of Ile and Val) were separated in a background electrolyte (BGE) consisting of 40.0 mmol/L sodium tetraborate, and 40.0 mmol/L β-cyclodextrin (β-CD) at pH 10...
2017: PloS One
https://www.readbyqxmd.com/read/28639211/selective-venous-sampling-for-primary-hyperparathyroidism-how-to-perform-an-examination-and-interpret-the-results-with-reference-to-thyroid-vein-anatomy
#17
REVIEW
Takayuki Yamada, Masaya Ikuno, Yasumoto Shinjo, Atsushi Hiroishi, Shoichiro Matsushita, Tsuyoshi Morimoto, Reiko Kumano, Kunihiro Yagihashi, Takuyuki Katabami
Primary hyperparathyroidism (pHPT) causes hypercalcemia. The treatment for pHPT is surgical dissection of the hyperfunctioning parathyroid gland. Lower rates of hypocalcemia and recurrent laryngeal nerve injury imply that minimally invasive parathyroidectomy (MIP) is safer than bilateral neck resection. Current trends in MIP use can be inferred only by reference to preoperative localization studies. Noninvasive imaging studies (typically preoperative localization studies) show good detection rates of hyperfunctioning glands; however, there have also been cases of nonlocalization or discordant results...
June 21, 2017: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/28639109/occurrence-of-naproxen-ibuprofen-and-diclofenac-residues-in-wastewater-and-river-water-of-kwazulu-natal-province-in-south-africa
#18
Lawrence Mzukisi Madikizela, Luke Chimuka
The present paper reports a detailed study that is based on the monitoring of naproxen, ibuprofen, and diclofenac in Mbokodweni River and wastewater treatment plants (WWTPs) located around the city of Durban in KwaZulu-Natal Province of South Africa. Target compounds were extracted from water samples using a multi-template molecularly imprinted solid-phase extraction prior to separation and quantification on a high-performance liquid chromatography equipped with photo diode array detector. The analytical method yielded the detection limits of 0...
July 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28638256/comparison-of-ultrasonography-and-low-dose-computed-tomography-for-the-diagnosis-of-pediatric-urolithiasis-in-the-emergency-department
#19
Recep Sade, Hayri Ogul, Suat Eren, Akin Levent, Mecit Kantarci
OBJECTIVE: This study aimed to compare ultrasonography (US) and low-dose computed tomography (LDCT) for diagnosing pediatric urolithiasis in the emergency department. MATERIALS AND METHODS: This retrospective study was approved by our institutional ethics committee, and informed consent was waived. From March 2016 to March 2017, 100 consecutive patients met the selection criteria and were enrolled in the study. Patients were randomly selected in a 1:1 ratio and were allocated to one of the following two imaging groups: US or abdominal LDCT...
June 2017: Eurasian Journal of Medicine
https://www.readbyqxmd.com/read/28637960/pacemaker-induced-metallic-artifacts-in-coronary-computed-tomography-angiography-clinical-feasibility-of-single-energy-metal-artifact-reduction-technique
#20
Tomoya Takayanagi, Takehiro Arai, Makoto Amanuma, Tomonari Sano, Masato Ichiba, Kazumasa Ishizaka, Takako Sekine, Hideyuki Matsutani, Hitomi Morita, Shinichi Takase
BACKGROUND: Coronary computed tomography angiography (CCTA) in patients with pacemaker suffers from metallic lead-induced artifacts, which often interfere with accurate assessment of coronary luminal stenosis. The purpose of this study was to assess a frequency of the lead-induced artifacts and artifact-suppression effect by the single energy metal artifact reduction (SEMAR) technique. METHODS: Forty-one patients with a dual-chamber pacemaker were evaluated using a 320 multi-detector row CT (MDCT)...
2017: Nihon Hoshasen Gijutsu Gakkai Zasshi
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