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https://www.readbyqxmd.com/read/28343344/simultaneous-detection-of-chlorinated-polycyclic-aromatic-hydrocarbons-with-polycyclic-aromatic-hydrocarbons-by-gas-chromatography-mass-spectrometry
#1
Meng Qiao, Wei Cao, Bochuan Liu, Xu Zhao, Jiuhui Qu
Chlorinated polycyclic aromatic hydrocarbons (ClPAHs), including polychlorinated naphthalenes (PCNs), are hazardous and widespread in the environment, but studies of these substances in the wastewater environment are lacking. In this study, five typical PCNs and five typical ClPAHs (other than PCNs) were simultaneously detected along with their parent polycyclic aromatic hydrocarbons in wastewater samples. All these compounds could be analyzed by gas chromatography- electron ionization mass spectrometry in selected ion monitoring mode and separated on a DB-17ms column...
March 25, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28343091/rapid-detection-and-ruling-out-of-neonatal-sepsis-by-pcr-coupled-with-electrospray-ionization-mass-spectrometry-pcr-esi-ms
#2
Cristina Delcò, Oliver Karam, Riccardo Pfister, Alain Gervaix, Gesuele Renzi, Stéphane Emonet, Jacques Schrenzel, Klara M Posfay-Barbe
BACKGROUND: Sepsis is an important cause of morbidity and mortality in neonates and clinicians are typically required to administer empiric antibiotics while waiting for blood culture results. However, prolonged and inappropriate use of antibiotics is associated with various complications and adverse events. Better tools to rapidly rule out bacterial infections are therefore needed. AIMS: We aimed to assess the negative predictive value of PCR coupled with Electrospray Ionization Mass Spectrometry (PCR/ESI-MS) compared to conventional blood cultures in neonatal sepsis...
March 23, 2017: Early Human Development
https://www.readbyqxmd.com/read/28343078/development-and-validation-of-liquid-chromatography-tandem-mass-spectrometry-method-quantitative-determination-of-polymyxin-b1-polymyxin-b2-polymyxin-b3-and-isoleucine-polymyxin-b1-in-human-plasma-and-its-application-in-clinical-studies
#3
Kim H Hee, Yee K J Leaw, Jun L Ong, Lawrence S Lee
Polymyxin B (PB) is an antibiotic consisting of a cyclic heptapeptide and a tripeptide side chain used in treatment of infections caused by Gram-negative bacteria. Commercial formulations of PB contain multiple structurally related components with major constituents of PB1, PB2, PB3 and ile-PB1. To understand the pharmacokinetics of these major components, we have developed and validated a LC-MS/MS method to quantify PB1, PB2, PB3 and ile-PB1 in human plasma. PB was extracted from plasma by protein precipitation using trichloroacetic acid followed by chromatographic separation on Zorbax Bonus-RP column (100mm×2...
March 14, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28343077/separation-and-characterization-of-unknown-impurities-and-isomers-in-flomoxef-sodium-by-lc-it-tof-ms-and-study-of-their-negative-ion-fragmentation-regularities
#4
Xu Yu, Fan Wang, Jiani Li, Weiguang Shan, Bingqi Zhu, Jian Wang
Thirteen unknown impurities in flomoxef sodium were separated and characterized by liquid chromatography coupled with high resolution ion trap/time-of-flight mass spectrometry (LC-IT-TOF MS)with positive and negative modes of electrospray ionization method for further improvement of official monographs in pharmacopoeias. The fragmentation patterns of impurities in flomoxef in the negative ion mode were studied in detail, and new negative-ion fragmentation regularities were discovered. Chromatographic separation was performed on a Kromasil C18 column (250mm×4...
March 19, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28342611/short-communication-identification-of-corynebacterium-bovis-by-matrix-assisted-laser-desorption-ionization-mass-spectrometry
#5
Helio Langoni, Carolina Polo Camargo da Silva, Marcella Zampoli Troncarelli, Alessandra Tata, Katia Roberta Anacleto Belaz, Marcos Nogueira Eberlin, Samea Fernandes Joaquim, Felipe Freitas Guimarães, Renata Bonini Pardo, Eduardo Nardini Gomes
Corynebacterium bovis is a mastitis-causing microorganism responsible for economic losses related to decrease in milk production. The aim of the study was identify Corynebacterium spp. strains recovered from milk samples of subclinical mastitis by using matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS). Samples were collected during a 10-mo mastitis-monitoring program in a high-production dairy farm. In this study, 80 strains were analyzed; from these 54 (67.5%) were identified at species level as Corynebacterium bovis, 24 (31...
March 22, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28342596/the-practical-application-of-scintillation-dosimetry-in-small-field-photon-beam-radiotherapy
#6
Elisa Burke, Daniela Poppinga, Andreas A Schönfeld, Dietrich Harder, Björn Poppe, Hui Khee Looe
Plastic scintillation detectors are a new instrument of stereotactic photon-beam dosimetry. The clinical application of the plastic scintillation detector Exradin W1 at the Siemens Artiste and Elekta Synergy accelerators is a matter of current interest. In order to reduce the measurement uncertainty, precautions have to be taken with regard to the geometrical arrangement of the scintillator, the light-guide fiber and the photodiode in the radiation field. To determine the "Cerenkov light ratio" CLR with a type A uncertainty below 1%, the Cerenkov calibration procedure for small-field measurements based on the two-channel spectral method was used...
March 22, 2017: Zeitschrift Für Medizinische Physik
https://www.readbyqxmd.com/read/28342583/affinity-chromatographic-methodologies-based-on-immobilized-voltage-dependent-anion-channel-isoform-1-and-application-in-protein-ligand-interaction-analysis-and-bioactive-compounds-screening-from-traditional-medicine
#7
Qian Li, Pan Qiao, Xiu Chen, Jing Wang, Liujiao Bian, Xiaohui Zheng
Voltage dependent anion channel isoform 1 (VDAC-1) serves as an attractive target of anti-cancer drugs by mediating the entry and exit of metabolites between cytoplasm and mitochondria. This work reports on the preparation of a VDAC-1-based bioaffinity chromatographic stationary phase by linking the protein on lecithin modified microspheres. An assay of chromatographic methods including frontal analysis, zonal elution, injection dependent analysis and nonlinear chromatography were utilized to investigate the bindings of ATP, NADH and NADPH to VDAC-1...
March 18, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28342453/ionizing-radiation-biomarkers-in-epidemiological-studies-an-update
#8
REVIEW
Janet Hall, Penny A Jeggo, Catharine West, Maria Gomolka, Roel Quintens, Christophe Badie, Olivier Laurent, An Aerts, Nataša Anastasov, Omid Azimzadeh, Tamara Azizova, Sarah Baatout, Bjorn Baselet, Mohammed A Benotmane, Eric Blanchardon, Yann Guéguen, Siamak Haghdoost, Mats Harms-Ringhdahl, Julia Hess, Michaela Kreuzer, Dominique Laurier, Ellina Macaeva, Grainne Manning, Eileen Pernot, Jean-Luc Ravanat, Laure Sabatier, Karine Tack, Soile Tapio, Horst Zitzelsberger, Elisabeth Cardis
Recent epidemiology studies highlighted the detrimental health effects of exposure to low dose and low dose rate ionizing radiation (IR): nuclear industry workers studies have shown increased leukaemia and solid tumour risks following cumulative doses of <100mSv and dose rates of <10mGy per year; paediatric patients studies have reported increased leukaemia and brain tumours risks after doses of 30-60mGy from computed tomography scans. Questions arise, however, about the impact of even lower doses and dose rates where classical epidemiological studies have limited power but where subsets within the large cohorts are expected to have an increased risk...
January 2017: Mutation Research
https://www.readbyqxmd.com/read/28340407/transmission-of-persistent-ionizing-radiation-induced-foci-through-cell-division-in-human-primary-cells
#9
Aurelie Vaurijoux, Pascale Voisin, Amelie Freneau, Joan Francesc Barquinero, Gaetan Gruel
Unrepaired DNA double-strand breaks (DSBs) induced by ionizing radiation are associated with lethal effects and genomic instability. After the initial breaks and chromatin destabilization, a set of post-translational modifications of histones occurs, including phosphorylation of serine 139 of histone H2AX (γH2AX), which leads to the formation of ionizing radiation-induced foci (IRIF). DSB repair results in the disappearance of most IRIF within hours after exposure, although some remain 24h after irradiation...
March 10, 2017: Mutation Research
https://www.readbyqxmd.com/read/28340385/experimental-study-of-polyethylene-pyrolysis-and-combustion-over-hzsm-5-husy-and-mcm-41
#10
Que Huang, Changcheng Liu, Ruichao Wei, Jian Wang
The effects of temperatures, catalysts, and catalyst contents on polyethylene (PE) pyrolysis were investigated by using single-photon ionization time-of-flight mass spectrometry (SPI-TOFMS). The mass spectra of pyrolyzed PE and PE/catalysts from 300°C to 800°C illustrate that the pyrolysis reactions were apparently promoted and varied by introducing HZSM-5, HUSY, and MCM-41. As microporous catalysts, HZSM-5 and HUSY were found to accelerate the BTX formation at 400°C, which could not be observed for pure PE until 800°C...
March 14, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28340309/analytical-techniques-in-lipidomics-state-of-the-art
#11
Kamil Jurowski, Kamila Kochan, Justyna Walczak, Małgorzata Barańska, Wojciech Piekoszewski, Bogusław Buszewski
Current studies related to lipid identification and determination, or lipidomics in biological samples, are one of the most important issues in modern bioanalytical chemistry. There are many articles dedicated to specific analytical strategies used in lipidomics in various kinds of biological samples. However, in such literature, there is lack of articles dedicated to a comprehensive review of the actual analytical methodologies used in lipidomics. The aim of this article is to characterize the lipidomics methods used in modern bioanalysis according to the methodological point of view: 1) chromatography/separation methods, 2) spectroscopic methods and 3) mass spectrometry and also hyphenated methods...
March 24, 2017: Critical Reviews in Analytical Chemistry
https://www.readbyqxmd.com/read/28339778/effects-of-an-induced-molt-using-cassava-meal-on-body-weight-loss-blood-physiology-ovarian-regression-and-postmolt-egg-production-in-late-phase-laying-hens
#12
N Gongruttananun, P Kochagate, K Poonpan, N Yu-Nun, J Aungsakul, N Sopa
This study was conducted to determine the effect of an induced molt using cassava meal on body weight, blood physiology, ovary, and postmolt performance in late-phase (74 wk old) H&N Brown laying hens. Hens were randomly assigned to 3 treatments of 90 birds each: 1) Controls withno induced molt (CONT); 2) molted by full feeding with cassava meal for 3 wk (FP3); and 3) molted by full feeding with cassava meal for 4 wk (FP4). Groups 2 and 3 were fed a pullet developer diet for 3 wk following treatment. During the molt period, the birds were exposed to an 8L:16D photoperiod and had access to drinking water at all times...
February 23, 2017: Poultry Science
https://www.readbyqxmd.com/read/28339240/single-photon-thermal-ionization-of-c_-60
#13
Klavs Hansen, Robert Richter, Michele Alagia, Stefano Stranges, Luca Schio, Peter Salén, Vasyl Yatsyna, Raimund Feifel, Vitali Zhaunerchyk
We report on experiments which show that C_{60} can ionize in an indirect, quasithermal boiloff process after absorption of a single photon. The process involves a large number of incoherently excited valence electrons and yields electron spectra with a Boltzmann distribution with temperatures exceeding 10^{4}  K. It is expected to be present for other molecules and clusters with a comparatively large number of valence electrons. The astrophysical consequences are briefly discussed.
March 10, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28339049/kidney-and-heavy-metals-the-role-of-environmental-exposure-review
#14
Paolo Lentini, Luca Zanoli, Antonio Granata, Salvatore Santo Signorelli, Pietro Castellino, Roberto Dell'Aquila
Heavy metals are extensively used in agriculture and industrial applications such as production of pesticides, batteries, alloys, and textile dyes. Prolonged, intensive or excessive exposure can induce related systemic disorders. Kidney is a target organ in heavy metal toxicity for its capacity to filter, reabsorb and concentrate divalent ions. The extent and the expression of renal damage depends on the species of metals, the dose, and the time of exposure. Almost always acute kidney impairment differs from chronic renal failure in its mechanism and in the magnitude of the outcomes...
March 24, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28338894/establishment-of-radiation-doses-for-pediatric-x-ray-examinations-in-a-large-pediatric-hospital-in-turkey
#15
T Olgar, T Sahmaran
Pediatric patients are more sensitive to ionizing radiation when compared with adults. The aim of this study was to evaluate the radiation doses for some common pediatric x-ray examinations performed with various digital radiography systems. Quality control tests of the digital radiography systems were carried out according to international published protocols before the pediatric dose measurements. Radiation dose measurement was performed by using the x-ray tube outputs and thermoluminescent dosimeter dose measurement methods...
February 25, 2017: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/28338865/assessment-of-public-exposure-form-wlans-in-the-west-bank-palestine
#16
Adnan Lahham, Afifeh Sharabati, Hussein ALMasri
A total of 271 measurements were conducted at 69 different sites including homes, hospitals, educational institutions and other public places to assess the exposure to radiofrequency emission from wireless local area networks (WLANs). Measurements were conducted at different distances from 40 to 10 m from the access points (APs) in real life conditions using Narda SRM-3000 selective radiation meter. Three measurements modes were considered at 1 m distance from the AP which are transmit mode, idle mode, and from the client card (laptop computer)...
March 3, 2017: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/28338797/an-estimation-of-the-exposure-of-the-population-of-israel-to-natural-sources-of-ionizing-radiation
#17
L Epstein, J Koch, T Riemer, G Haquin, I Orion
The radiation dose to the population of Israel due to exposure to natural sources of ionizing radiation was assessed. The main contributor to the dose is radon that accounts for 60% of the exposure to natural sources. The dose due to radon inhalation was assessed by combining the results of a radon survey in single-family houses with the results of a survey in apartments in multi-storey buildings. The average annual dose due to radon inhalation was found to be 1.2 mSv. The dose rate due to exposure to cosmic radiation was assessed using a code that calculates the dose rate at different heights above sea level, taking into account the solar cycle...
February 18, 2017: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/28338457/transplant-renal-vein-thrombosis
#18
Khaled El Zorkany, Julie-Michelle Bridson, Ajay Sharma, Ahmed Halawa
Transplant renal vein thrombosis usually occurs early after surgery with a reported prevalence of 0.1% to 4.2%. It is a devastating event that ultimately leads to graft loss in almost all cases. There are many predisposing factors related to donor, recipient, surgery, and immunosuppression, with mechanical factors being considered the most common causes of transplant renal vein thrombosis. The clinical manifestations of acute renal vein thrombosis are nonspecific and are not dissimilar to the features of urine leak, urinary obstruction, or severe acute rejection...
April 2017: Experimental and Clinical Transplantation
https://www.readbyqxmd.com/read/28338331/an-in-silico-study-on-the-isomers-of-pentacene-the-case-for-air-stable-and-alternative-c22h14-acenes-for-organic-electronics
#19
Leighton Jones, Long Lin
Pentacene is one of the most investigated candidates for organic thin film transistor (OTFT) applications over the last few decades even though it unstable in air (Eg = 1.80 eV), owing in part to its planar nature and high charge-transfer mobilities as both a single crystal (35 cm2 V 1 s 1) and as a thin-film (3.0 cm2 V 1 s 1). Until now, picene is the only isomer of pentacene to be investigated for organic electronic applications, due to its greater stability (Eg = 4.21 eV) and high charge transfer mobility (3...
March 24, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28338135/detection-of-chemical-warfare-agent-simulants-and-hydrolysis-products-in-biological-samples-by-paper-spray-mass-spectrometry
#20
Josiah McKenna, Elizabeth S Dhummakupt, Theresa Connell, Paul S Demond, Dennis B Miller, J Michael Nilles, Nicholas E Manicke, Trevor Glaros
Paper spray ionization coupled to a high resolution tandem mass spectrometer (a quadrupole orbitrap) was used to identify and quantitate chemical warfare agent (CWA) simulants and their hydrolysis products in blood and urine. Three CWA simulants, dimethyl methylphosphonate (DMMP), trimethyl phosphate (TMP), and diisopropyl methylphosphonate (DIMP), and their isotopically labeled standards were analyzed in human whole blood and urine. Calibration curves were generated and tested with continuing calibration verification standards...
March 24, 2017: Analyst
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