keyword
MENU ▼
Read by QxMD icon Read
search

mass trace

keyword
https://www.readbyqxmd.com/read/28107699/analysis-of-n-nitrosonornicotine-enantiomers-in-human-urine-by-chiral-stationary-phase-liquid-chromatography-nanoelectrospray-ionization-high-resolution-tandem-mass-spectrometry
#1
Jing Yang, Steven G Carmella, Stephen S Hecht
We have developed a chiral stationary phase liquid chromatography-nanoelectrospray ionization-high resolution tandem mass spectrometry (LC-NSI-HRMS/MS) method to investigate the enantiomeric composition of low parts per trillion amounts of the carcinogen N'-nitrosonornicotine (NNN) in the urine of cigarette smokers and smokeless tobacco users. (S)-NNN is the major enantiomer in tobacco and is more carcinogenic than (R)-NNN in rats, but no data are available on the enantiomeric composition of NNN in humans. The method used [(13)C6]NNN as an internal standard and [pyridine-D4]nornicotine to monitor possible artifactual formation of NNN, which was found to be less than 2% of the quantified NNN...
January 9, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28105805/towards-3d-chemical-imaging-of-ternary-cu-sn-pb-alloys-using-femtosecond-laser-ablation-ionization-mass-spectrometry
#2
Valentine Grimaudo, Pavel Moreno-Garcia, Andreas Riedo, Stefan Meyer, Marek Tulej, Maike Brigitte Neuland, Miklós Mohos, Christoph Gütz, Siegfried R R Waldvogel, Peter Wurz, Peter Broekmann
Femtosecond Laser Ablation/Ionization Mass Spectrometry (LIMS) has been applied to probe the spatial element composition of three ternary Cu-Sn-Pb model bronze alloys (lead bronzes: CuSn10Pb10, CuSn7Pb15 and CuSn5Pb20), which were recently identified as high performance cathode materials in the context of electro-organic synthesis (dehalogenation, deoxygenation) of pharmaceutically relevant building blocks. The quantitative and spatially resolved element analysis of such cathode materials will help understanding the observed profound differences in their electrochemical reactivity and stability...
January 4, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28105341/changes-in-blood-concentrations-of-trace-metals-in-cancer-patients-receiving-cisplatin-based-chemotherapy
#3
Tsutomu Nakamura, Minoru Takahashi, Riho Niigata, Kazuhiko Yamashita, Manabu Kume, Midori Hirai, Hiroyuki Yasui
The administration of cisplatin (CDDP) may influence trace metal concentrations in body fluids. In order to test this hypothesis, the blood concentrations of trace metals were determined during the present study in eight Japanese esophageal and lung cancer patients receiving CDDP-based chemotherapy. The levels of manganese, iron (Fe), cobalt, copper, zinc (Zn), platinum and lead in the plasma were determined by inductively coupled plasma-mass spectrometry. In addition, the serum levels of Fe, transferrin and ferritin were evaluated...
December 2016: Biomedical Reports
https://www.readbyqxmd.com/read/28103941/involvement-of-the-endocannabinoid-system-in-the-physiological-response-to-transient-common-carotid-artery-occlusion-and-reperfusion
#4
Marina Quartu, Laura Poddighe, Tiziana Melis, Maria Pina Serra, Marianna Boi, Sara Lisai, Gianfranca Carta, Elisabetta Murru, Laura Muredda, Maria Collu, Sebastiano Banni
BACKGROUND: The transient global cerebral hypoperfusion/reperfusion achieved by induction of Bilateral Common Carotid Artery Occlusion followed by Reperfusion (BCCAO/R) may trigger a physiological response in an attempt to preserve tissue and function integrity. There are several candidate molecules among which the endocannabinoid system (ECS) and/or peroxisome-proliferator activated receptor-alpha (PPAR-alpha) may play a role in modulating oxidative stress and inflammation. The aims of the present study are to evaluate whether the ECS, the enzyme cyclooxygenase-2 (COX-2) and PPAR-alpha are involved during BCCAO/R in rat brain, and to identify possible markers of the ongoing BCCAO/R-induced challenge in plasma...
January 19, 2017: Lipids in Health and Disease
https://www.readbyqxmd.com/read/28098420/deciphering-chemical-interactions-between-glycyrrhizae-radix-and-coptidis-rhizoma-by-liquid-chromatography-with-transformed-multiple-reaction-monitoring-mass-spectrometry
#5
Zhenhao Li, Ting Liu, Jie Liao, Ni Ai, Xiaohui Fan, Yiyu Cheng
In this study, we propose an integrated strategy for the efficient identification and quantification of herbal constituents using liquid chromatography with mass spectrometry. First, liquid chromatography with quadrupole time-of-flight mass spectrometry was employed for the chemical profiling of herbs, where a targeted following non-targeted approach was developed to detect trace constituents by using structural correlations and extracted ion chromatograms. Next, ion pairs and parameters of MS(2) of quadrupole time-of-flight mass spectrometry were selected to design multiple reaction monitoring transitions for the identified compounds on liquid chromatography with triple quadrupole mass spectrometry...
January 18, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28093694/comparative-analysis-on-the-effect-of-plantago-species-aqueous-extracts-on-tissue-trace-element-content-in-rats
#6
Evgenia R Gatiatulina, Olga N Nemereshina, Joanna Suliburska, Tejo Prakash Nagaraja, Anastasia A Skalnaya, Alexandr A Nikonorov, Anatoly V Skalny, Alexey A Tinkov
The primary objective of this study is to assess the influence of water extracts of Plantago major L., Plantago lanceolata L., and Plantago maxima Juss. ex Jacq. leaves on tissue trace element content in healthy adult Wistar rats. Twenty-eight female Wistar rats consumed pure drinking water or one of the three aqueous extracts of Plantago for 1 month. The extracts and liver, serum, hair, and adipose tissue of the rats were examined for trace element contents using inductively coupled plasma mass spectrometry...
January 16, 2017: Biological Trace Element Research
https://www.readbyqxmd.com/read/28093120/elucidating-rhizosphere-processes-by-mass-spectrometry-a-review
#7
REVIEW
Ariana Rugova, Markus Puschenreiter, Gunda Koellensperger, Stephan Hann
The presented review discusses state-of-the-art mass spectrometric methods, which have been developed and applied for investigation of chemical processes in the soil-root interface, the so-called rhizosphere. Rhizosphere soil's physical and chemical characteristics are to a great extent influenced by a complex mixture of compounds released from plant roots, i.e. root exudates, which have a high impact on nutrient and trace element dynamics in the soil-root interface as well as on microbial activities or soil physico-chemical characteristics...
March 1, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28092076/determination-of-trace-elements-in-cow-placenta-by-tungsten-coil-atomic-emission-spectrometry
#8
Daniel A Gonçalves, Ana C Soncin, George L Donati, Mirian C Dos Santos
Tungsten coil atomic emission spectrometry (WCAES) is used to determine trace levels of Mn (403.1 nm) and Cr (425.5 nm) in cow placenta. All samples were collected in Ilha Solteira, SP, Brazil. The instrumental setup is based on a tungsten filament extracted from 150 W, 15 V microscope light bulbs, a solid state power supply, fused silica lens, crossed Czerny-Turner spectrograph, and a thermoelectrically cooled charge-coupled device detector. The limits of detection (LOD) and quantification (LOQ) for Cr are 2 and 8 μg L(-1), and 20 and 60 μg L(-1) for Mn, respectively...
January 16, 2017: Biological Trace Element Research
https://www.readbyqxmd.com/read/28091665/trace-element-protein-interactions-in-endolymph-from-the-inner-ear-of-fish-implications-for-environmental-reconstructions-using-fish-otolith-chemistry
#9
Oliver R B Thomas, Katherine Ganio, Blaine R Roberts, Stephen E Swearer
Otoliths, the biomineralised hearing "ear stones" from the inner ear of fish, grow throughout the lifespan of an individual, with deposition of alternating calciferous and proteinaceous bands occurring daily. Trace element : calcium ratios within daily increments measured by laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) are often used in fisheries science to reconstruct environmental histories. There is, however, considerable uncertainty as to which elements are interacting with either the proteinaceous or calciferous zones of the otolith, and thus their utility as indicators of environmental change...
January 16, 2017: Metallomics: Integrated Biometal Science
https://www.readbyqxmd.com/read/28088697/vertical-distribution-of-236-u-in-the-north-pacific-ocean
#10
R Eigl, P Steier, K Sakata, A Sakaguchi
The first extensive study on (236)U in the North Pacific Ocean has been conducted. The vertical distribution of (236)U/(238)U isotopic ratios and the (236)U concentrations were analysed on seven depth profiles, and large variations with depth were found. The range of (236)U/(238)U isotopic ratios was from (0.09 ± 0.03) × 10(-10) to (14.1 ± 2.2) × 10(-10), which corresponds to (236)U concentrations of (0.69 ± 0.24) × 10(5) atoms/kg and (119 ± 21) × 10(5) atoms/kg, respectively. The variations in (236)U concentrations could mainly be attributed to the different water masses in the North Pacific Ocean and their formation processes...
January 12, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28087984/challenges-in-detecting-substances-for-equine-anti-doping
#11
REVIEW
A G Fragkaki, N Kioukia-Fougia, P Kiousi, M Kioussi, M Tsivou
The artificial increase of the physical capability of horses using drugs is well-known in racing and in other equine sports. Both illicit and therapeutic substances are regarded as prohibited substances in competition in most countries. Some countries do make distinctions for a few, specific drugs which are, however, allowed for use in other countries. The primary objective in the case of doping control is the detection of any trace of drug exposure, either parent drug or any of its metabolites, using the most powerful analytical methods which generally are based on chromatographic/mass spectrometric techniques...
January 14, 2017: Drug Testing and Analysis
https://www.readbyqxmd.com/read/28074245/antifeedants-produced-by-bacteria-associated-with-the-gut-of-the-pine-weevil-hylobius-abietis
#12
Karolin Axelsson, Vera Konstanzer, Gunaratna Kuttuva Rajarao, Olle Terenius, Lisa Seriot, Henrik Nordenhem, Göran Nordlander, Anna-Karin Borg-Karlson
The pine weevil, Hylobius abietis, is a severe forest pest insect as it feeds on newly planted conifer seedlings. To identify and develop an antifeedant could be one step towards the protection of seedlings from feeding damage by the pine weevil. With the aim to trace the origin of the antifeedants previously found in feces of the pine weevil, we investigated the culturable bacteria associated with the gut and identified the volatiles they produced. Bacterial isolates were identified by 16S ribosomal RNA gene analysis...
January 10, 2017: Microbial Ecology
https://www.readbyqxmd.com/read/28073504/distribution-of-dinophysis-species-and-their-association-with-lipophilic-phycotoxins-in-plankton-from-the-argentine-sea
#13
Elena Fabro, Gastón O Almandoz, Martha Ferrario, Urban Tillmann, Allan Cembella, Bernd Krock
Dinophysis is a cosmopolitan genus of marine dinoflagellates, considered as the major proximal source of diarrheic shellfish toxins and the only producer of pectenotoxins (PTX). From three oceanographic expeditions carried out during autumn, spring and late summer along the Argentine Sea (∼38-56°S), lipophilic phycotoxins were determined by liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS) in size-fractionated plankton samples. Lipophilic toxin profiles were associated with species composition by microscopic analyses of toxigenic phytoplankton...
November 2016: Harmful Algae
https://www.readbyqxmd.com/read/28071021/the-effect-of-alcohol-consumption-on-maternal-and-cord-blood-electrolyte-and-trace-element-levels
#14
Anatoly V Skalny, Elena S Berezkina, Elena V Kiyaeva, Inara E Alidzhanova, Andrew R Grabeklis, Alexey A Tinkov
BACKGROUND: Earlier studies demonstrated that alcoholism significantly alters electrolyte and trace element homeostasis. However, the existing data on the interplay between maternal alcohol consumption and fetal trace element status are contradictory. Therefore, the primary objective of the present study was to assess the influence of alcohol consumption on maternal and cord blood trace elements. METHODS: A total of 30 pregnant women (15 women consuming alcohol and 15 controls) were examined...
October 2016: Acta Scientiarum Polonorum. Technologia Alimentaria
https://www.readbyqxmd.com/read/28068288/monitoring-of-breath-vocs-and-electrical-impedance-tomography-under-pulmonary-recruitment-in-mechanically-ventilated-patients
#15
Beate Brock, Svend Kamysek, Josephine Silz, Phillip Trefz, Jochen K Schubert, Wolfram Miekisch
Analysis of exhaled VOCs can provide information on physiology, metabolic processes, oxidative stress and lung diseases. In critically ill patients, VOC analysis may be used to gain complimentary information beyond global clinical parameters. This seems especially attractive in mechanically ventilated patients frequently suffering from impairment of gas exchange. This study was intended to assess (a) the effects of recruitment maneuvers onto VOC profiles, (b) the correlations between electrical impedance tomography (EIT) data and VOC profiles and (c) the effects of recruitment onto distribution of ventilation...
January 9, 2017: Journal of Breath Research
https://www.readbyqxmd.com/read/28063766/reference-levels-of-trace-elements-in-hair-samples-from-children-and-adolescents-in-madrid-spain
#16
María Teresa Llorente Ballesteros, Irene Navarro Serrano, Silvia Izquierdo Álvarez
INTRODUCTION: Hair samples are used as a tool to evaluate environmental exposure to contaminants and metabolic status in the individual. However, the use of human hair is controversial, mainly because of the lack of well-defined reference levels. In the case of Spain, very few biomonitoring studies have investigated these issues in infants, children or adolescents. OBJECTIVE: To establish reference levels for trace elements in children and teenagers in Madrid, Spain...
December 29, 2016: Journal of Trace Elements in Medicine and Biology
https://www.readbyqxmd.com/read/28063698/nitrogen-isotopic-characterisation-of-macroalgae-blooms-from-different-sites-within-a-subtropical-bay-in-the-gulf-of-california
#17
Alejandra Piñón-Gimate, Noemi Espinosa-Andrade, Alberto Sánchez, Margarita Casas-Valdez
In La Paz Bay conspicuous macroalgal blooms of Ulva spp. are recurrent in the waterfront of the city; studies relate its growth to seasonality and nutrient enrichment but their relative influence is not known. We use the δ(15)N to discern amongst nitrogen sources at three sites with different substratum and anthropogenic activities. Ulva blooms were monitored monthly at San Juan de la Costa (SJC), Casa del Marino (CM) and El Tecolote (TE). Species presence varied between sites and months. At SJC Ulva displayed the highest signal of δ(15)N associated with fishing products and local mining wastewaters (19...
January 4, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28063510/converting-citrus-wastes-into-value-added-products-economic-and-environmently-friendly-approaches
#18
REVIEW
Kavita Sharma, Neelima Mahato, Moo Hwan Cho, Yong Rok Lee
Citrus fruits, including oranges, grapefruits, lemons, limes, tangerines, and mandarins, are among the most widely cultivated fruits around the globe. Its production is increasing every year due to rising consumer demand. Citrus-processing industries generate huge amounts of wastes every year, and citrus peel waste alone accounts for almost 50% of the wet fruit mass. Citrus waste is of immense economic value as it contains an abundance of various flavonoids, carotenoids, dietary fiber, sugars, polyphenols, essential oils, and ascorbic acid, as well as considerable amounts of some trace elements...
February 2017: Nutrition
https://www.readbyqxmd.com/read/28063334/towards-interference-free-hplc-sers-for-the-trace-analysis-of-drug-metabolites-in-biological-fluids
#19
Waleed A Hassanain, Emad L Izake, Arumugam Sivanesan, Godwin A Ayoko
Sofosbuvir metabolite, 2'-deoxy-2'-fluoro-2'-C-methyluridine (PSI-6206) was studied for the first time by surface enhanced Raman spectroscopy (SERS) using the paper-based SERS substrate. The quantification limit of PSI-6206 by SERS was found to be 13ngL(-1) (R(2) value=0.959, RSD=5.23%). For the structural and quantitative analysis of PSI-6206 in blood plasma, an interference-free HPLC-SERS method was developed and compared to HPLC-DAD and HPLC-MS methods. The SERS quantification of the drug by the paper substrate was 4 orders of magnitude more sensitive than that by the diode array detector...
December 23, 2016: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28062288/designation-of-pathogenic-resistant-bacteria-in-the-sparusaurata-sea-collected-in-tunisia-coastlines-correlation-with-high-performance-liquid-chromatography-tandem-mass-spectrometry-analysis-of-antibiotics
#20
Amina Zouiten, Ines Mehri, Asma Beltifa, Asma Ghorbel, Olivier Sire, Joris Van Loco, Hassen Abdenaceur, Tim Reyns, Hedi Ben Mansour
Vibrio is characterized by a large number of species and some of them are human pathogens causing gastro intestinal and wound infections through the ingestion or manipulation of contaminated fishes including Vibrio parahaemolyticus and Vibrio alginolyticus. In this study, we reported the phenotypic and molecular characterization of Vibrio parahaemolyticus and Vibrio alginolyticus strains isolated from wild and farm sea bream (Sparus aurata L.) along the Tunisian coast from December 2015 to April 2016. Therefore, the antibiograms indicate a difference between farmed and wild fish...
January 3, 2017: Microbial Pathogenesis
keyword
keyword
12730
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"