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https://www.readbyqxmd.com/read/28877433/detection-of-chemical-warfare-agent-related-phenylarsenic-compounds-in-marine-biota-samples-by-lc-hesi-ms-ms
#1
Hanna Niemikoski, Martin Soderstrom, Paula Vanninen
A new method has been developed to determine oxidation products of three chemical warfare agent (CWA) related phenylarsenic compounds from marine biota samples by a liquid chromatography-heated electrospray ioniza-tion/tandem mass spectrometry (LC-HESI/MS/MS). The target chemicals were oxidation products of Adamsite (DM[ox]), Clark I (DA[ox]), and triphenylarsine (TPA[ox]). Method was validated within the concentration range of 1-5 ng/g, 0.2-5 ng/g and 0.2-5 ng/g for DM[ox], DA[ox] and TPA[ox], respectively...
September 6, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28876440/factors-associated-with-first-time-nclex-rn-success-a-descriptive-research-study
#2
Tanya Johnson, Bonnie Sanderson, Chih-Hsuan Wang, Francine Parker
BACKGROUND: The purpose of this study was to identify variables associated with scores achieved on the Health Education Systems, Inc. (HESI) exit examination and successful first-time NCLEX-RN(®) pass rates. METHOD: A retrospective descriptive study examined the administrative data of 211 baccalaureate nursing students. RESULTS: Students who completed the program in sequence and scored higher in certain HESI course examinations were more likely to have a better performance on the HESI exit examination...
September 1, 2017: Journal of Nursing Education
https://www.readbyqxmd.com/read/28820983/a-sensitive-method-for-the-separation-and-quantification-of-low-level-adenine-nucleotides-using-porous-graphitic-carbon-based-liquid-chromatography-and-tandem-mass-spectrometry
#3
Sonia Bustamante, Robert B Gilchrist, Dulama Richani
A liquid chromatography coupled to heated electrospray ionization/tandem mass spectrometry (LC-HESI-MS/MS) method was developed for the simultaneous quantitative analysis of low nanomolar level adenine nucleotides AMP, ADP, ATP, cyclic AMP (cAMP), and the nucleoside adenosine. For analyte retention and separation, reverse phase chromatography using porous graphitic carbon (PGC) was employed as it provided full resolution. The erratic chromatographic behaviour characteristic of PGC, including deterioration of analyte resolution and increased peak tailing (leading to decreased sensitivity), was mitigated by incorporating acidic equilibration within runs using a quaternary gradient...
September 1, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28802219/development-and-validation-of-a-high-performance-liquid-chromatography-tandem-mass-spectrometry-method-to-quantify-ly-354-740-in-rat-and-marmoset-plasma
#4
Fleur Gaudette, Adjia Hamadjida, Dominique Bédard, Stephen G Nuara, Francis Beaudry, Philippe Huot
LY-354,740 (eglumegad) is a selective and potent agonist of the metabotropic glutamate group II receptors (mGluR2,3) that has already entered clinical trials as a potential anti-psychotic agent and therefore has well-documented pharmacokinetic (PK), safety and tolerability profiles in human. Whereas its development as an anti-psychotic agent has not been pursued, LY-354,740 may have potential in other neuroscience-related fields, notably anxiety and neuro-protection. The common marmoset is a small primate that has long been used in neuroscience...
September 1, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28742650/reliable-and-easy-to-use-liquid-chromatography-tandem-mass-spectrometry-method-for-simultaneous-analysis-of-fluconazole-isavuconazole-itraconazole-hydroxy-itraconazole-posaconazole-and-voriconazole-in-human-plasma-and-serum
#5
Carsten Müller, David Gehlen, Cornelia Blaich, Domenik Prozeller, Blasius Liss, Thomas Streichert, Martin H J Wiesen
BACKGROUND: A fast and easy-to-use liquid chromatography-tandem mass spectrometry method for the determination and quantification of 6 triazoles [fluconazole (FLZ), isavuconazole (ISZ), itraconazole (ITZ), hydroxy-itraconazole (OH-ITZ), posaconazole (PSZ), and voriconazole (VRZ)] in human plasma and serum was developed and validated for therapeutic drug monitoring. METHODS: Sample preparation was based on protein precipitation with acetonitrile and subsequent centrifugation...
October 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/28658524/determination-of-testosterone-esters-in-the-hair-of-male-greyhound-dogs-using-liquid-chromatography-high-resolution-mass-spectrometry
#6
Jayasree Leela Devi, Paul Zahra, John H Vine, Ted Whittem
The doping of greyhound dogs with testosterone is done in an attempt to improve their athletic performance, but such doping cannot easily be confirmed especially in male dogs owing to the natural presence of endogenous testosterone. As testosterone is usually administered as its esters their direct detection in hair would provide confirmatory evidence of the administration of a pharmaceutical product. This paper demonstrates that the use of a liquid chromatography-high resolution mass spectrometry method with heated electrospray ionisation (HESI) combined with the use of amino SPE cartridges for sample clean up, is suitable for the sensitive determination of propionate, phenyl propionate, isocaproate, decanoate and enanthate esters of testosterone in greyhound hair...
June 28, 2017: Drug Testing and Analysis
https://www.readbyqxmd.com/read/28655687/the-balkan-endemic-plant-nepeta-rtanjensis-lamiaceae-phenolic-composition-antioxidant-activity-and-antigenotoxic-effects-on-human-lymphocytes-treated-with-triiodothyronine-in-vitro
#7
Jasna Bosnjak-Neumuller, Milena Radakovic, Ninoslav Djelic, Branka Vukovic-Gacic, Zora Dajic Stevanovic, Stoimir Kolarevic, Danijela Misic, Milan Stankovic, Jelena Knezevic-Vukcevicc, Biljana Spremo-Potparevic, Zoran Stanimirovic
The success of antioxidant therapy in hyperthyroidism implies that disease is mediated by oxidative stress, which is known as one of the causing agents of ageing, degenerative diseases, and cancer. The main objective of our study was to determine possible protective effects of methanolic extract of N. rtanjensis in triiodothyronine (T3)-induced DNA breaks of human lymphocytes under in vitro conditions, based upon plant antioxidant capacity related to its phytochemical profile, mainly its polyphenolic complex...
May 2017: Pakistan Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28650332/nepeta-rtanjensis-lamiaceae-a-plant-endemic-to-the-balkans-phenolic-composition-antioxidant-activity-and-in-vitro-antigenotoxic-effects-in-triiodothyronine-induced-dna-damage-in-human-lymphocytes
#8
Jasna Bošnjak-Neumüller, Milena Radaković, Ninoslav Djelić, Branka Vuković-Gačić, Zora Dajić Stevanović, Stoimir Kolarević, Danijela Mišić, Milan Stanković, Jelena Knežević-Vukčević, Biljana Spremo-Potparević, Zoran Stanimirović
The success of antioxidant therapy in hyperthyroidism implies that disease is mediated by oxidative stress, which is known as one of the causing agents of ageing, degenerative diseases, and cancer. The main objective of our study was to determine possible protective effects of methanolic extract of N. rtanjensis in triiodothyronine (T3)-induced DNA breaks of human lymphocytes under in vitro conditions, based upon plant antioxidant capacity related to its phytochemical profile, mainly its polyphenolic complex...
March 2017: Pakistan Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28628072/retention-of-content-utilizing-a-flipped-classroom-approach
#9
Bobbi Shatto, Kristine LʼEcuyer, Jerod Quinn
The flipped classroom experience promotes retention and accountability for learning. The authors report their evaluation of a flipped classroom for accelerated second-degree nursing students during their primary medical-surgical nursing course. Standardized HESI® scores were compared between a group of students who experienced the flipped classroom and a previous group who had traditional teaching methods. Short- and long-term retention was measured using standardized exams 3 months and 12 months following the course...
July 2017: Nursing Education Perspectives
https://www.readbyqxmd.com/read/28585983/exploring-the-correlation-between-nontraditional-variables-and-student-success-a-longitudinal-study
#10
Haley Perkins Strickland, Michelle Haney Cheshire
BACKGROUND: The purpose of this project was to determine whether a correlation exists between the traditional admission criteria of grade point averages with the potential admission criteria of emotional intelligence (EI) scores or critical thinking (CT) scores to predict upper division student outcomes. METHOD: A quantitative, longitudinal design was selected to examine the identified variables to predict undergraduate student success. The recruiting sample included a convenience sample drawn from 112 junior-level undergraduate nursing students beginning their first of a five-semester nursing program...
June 1, 2017: Journal of Nursing Education
https://www.readbyqxmd.com/read/28577816/academic-and-demographic-predictors-of-nclex-rn-pass-rates-in-first-and-second-degree-accelerated-bsn-programs
#11
Mahmoud A Kaddoura, Elizabeth P Flint, Olga Van Dyke, Qing Yang, Li-Chi Chiang
Relatively few studies have addressed predictors of first-attempt outcomes (pass-fail) on the National Council Licensure Examination-Registered Nurses (NCLEX-RN) for accelerated BSN programs. The purpose of this study was to compare potential predictors of NCLEX outcomes in graduates of first-degree accelerated (FDA; n=62) and second-degree accelerated (SDA; n=173) BSN programs sharing a common nursing curriculum. In this retrospective study, bivariate analyses and multiple logistic regression assessed significance of selected demographic and academic characteristics as predictors of NCLEX-RN outcomes...
May 2017: Journal of Professional Nursing: Official Journal of the American Association of Colleges of Nursing
https://www.readbyqxmd.com/read/28434968/cardiac-contractility-correction-strategies-applied-to-telemetry-data-from-a-hesi-sponsored-consortium
#12
Emmanuel Boulay, Michael K Pugsley, Vincent Jacquemet, Alain Vinet, Michael V Accardi, Maxim Soloviev, Eric Troncy, Jennifer M Doyle, Jennifer Beck Pierson, Simon Authier
INTRODUCTION: QT has a long history of heart rate (HR) correction but limited investigations have been undertaken to assess the impact of cardiovascular parameters on left ventricular (LV) contractility in drug safety testing. Cardiac contractility is affected by preload (Cyon-Frank-Starling law), afterload (Anrep effect) and HR (Bowditch effect). We evaluated multi-parameter correction methods to help with dP/dtmax interpretation. METHODOLOGY: Modeling was undertaken using data from dogs in single or double 4×4 Latin square studies...
April 21, 2017: Journal of Pharmacological and Toxicological Methods
https://www.readbyqxmd.com/read/28364517/an-integrative-review-on-standardized-exams-as-a-predictive-admission-criterion-for-rn-programs
#13
Julie E Twidwell, Kathie Records
Nursing programs reject qualified applicants due to limited clinical placements and faculty. By admitting the strongest candidates, schools of nursing will reduce attrition rates, increase NCLEX-RN pass rates, and speed the entry into practice of well-prepared nurses to help stem the nursing shortage. This integrative review identified the standardized admission exams most predictive of student success. Included were articles published between 2005 and 2016 that focused on admission criteria, RN programs, specific exams (e...
April 1, 2017: International Journal of Nursing Education Scholarship
https://www.readbyqxmd.com/read/28314391/trace-determination-of-perfluorooctane-sulfonate-and-perfluorooctanoic-acid-in-environmental-samples-surface-water-wastewater-biota-sediments-and-sewage-sludge-using-liquid-chromatography-orbitrap-mass-spectrometry
#14
D Zacs, V Bartkevics
An analytical method was established and validated for the analysis of the most frequently monitored representatives among the group of perfluorinated compounds (PFAS), namely, perfluorooctanoic acid (PFOA) and prefluorooctane sulfonate (PFOS) in environmental samples (surface water, wastewater, sediments, sewage sludge, and biota). High performance liquid chromatography (HPLC) coupled to Orbitrap mass spectrometry (Orbitrap-MS) employing a heated electrospray ionization (HESI) interface operated in negative mode was used for the quantitative determination of these contaminants...
November 18, 2016: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28266262/using-exposure-bands-for-rapid-decision-making-in-the-risk21-tiered-exposure-assessment
#15
REVIEW
M Dellarco, R Zaleski, B J Gaborek, H Qian, C A Bellin, P Egeghy, N Heard, O Jolliet, D R Lander, N Sunger, K S Stylianou, J Y Tanir
The ILSI Health and Environmental Sciences Institute (HESI) Risk Assessment in the Twenty-first Century (RISK21) project was initiated to address and catalyze improvements in human health risk assessment. RISK21 is a problem formulation-based conceptual roadmap and risk matrix visualization tool, facilitating transparent evaluation of both hazard and exposure components. The RISK21 roadmap is exposure-driven, that is, exposure is used as the second step (after problem formulation) to define and focus the assessment...
April 2017: Critical Reviews in Toxicology
https://www.readbyqxmd.com/read/28097537/optimization-of-a-new-aerodynamic-cylindrical-faims-device-for-small-molecule-analysis
#16
Randy W Purves, Satendra Prasad, Michael Belford, Albert Vandenberg, Jean-Jacques Dunyach
The implementation of an aerodynamic mechanism to improve ion sampling between nanoelectrospray (n-ESI) and FAIMS was recently reported for proteomic analyses. This investigation explores the new FAIMS interface for small molecule analysis at high liquid flow rates and includes an examination of key differences in ionization between heated-ESI (HESI) and n-ESI. The sheath gas, critical for desolvation with HESI, affects FAIMS operation as higher FAIMS gas flow rates are required to achieve sufficient desolvation...
January 17, 2017: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/28074050/enhanced-dereplication-of-fungal-cultures-via-use-of-mass-defect-filtering
#17
Noemi D Paguigan, Tamam El-Elimat, Diana Kao, Huzefa A Raja, Cedric J Pearce, Nicholas H Oberlies
Effective and rapid dereplication is a hallmark of present-day drug discovery from natural sources. This project strove to both decrease the time and expand the structural diversity associated with dereplication methodologies. A 5 min liquid chromatographic run time employing heated electrospray ionization (HESI) was evaluated to determine whether it could be used as a faster alternative over the 10 min ESI method we reported previously. Results revealed that the 5 min method was as sensitive as the 10 min method and, obviously, was twice as fast...
May 2017: Journal of Antibiotics
https://www.readbyqxmd.com/read/27978469/highly-sensitive-lc-ms-ms-methods-for-the-determination-of-seven-human-cyp450-activities-using-small-oral-doses-of-probe-drugs-in-human
#18
Alexia Grangeon, Sophie Gravel, Fleur Gaudette, Jacques Turgeon, Veronique Michaud
Cocktails composed of several Cytochrome P450 (CYP450)-selective probe drugs have been shown of value to characterize in vivo drug-metabolism activities. Our objective was to develop and validate highly sensitive and selective LC-MS/MS assays allowing the determination of seven major human CYP450 isoenzyme activities following administration of low oral doses of a modified CYP450 probe-drug cocktail in patients. The seven-drug cocktail was composed of caffeine, bupropion, tolbutamide, omeprazole, dextromethorphan, midazolam (all administered concomitantly) and chlorzoxazone (administered separately) to phenotype for CYP1A2, 2B6, 2C9, 2C19, 2D6, 3A4/5 and 2E1, respectively...
January 1, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/27881178/measuring-stress-in-medical-education-validation-of-the-korean-version-of-the-higher-education-stress-inventory-with-medical-students
#19
Eun-Jung Shim, Hong Jin Jeon, Hana Kim, Kwang-Min Lee, Dooyoung Jung, Hae-Lim Noh, Myoung-Sun Roh, Bong-Jin Hahm
BACKGROUND: Medical students face a variety of stressors associated with their education; if not promptly identified and adequately dealt with, it may bring about several negative consequences in terms of mental health and academic performance. This study examined psychometric properties of the Korean version of the Higher Education Stress Inventory (K-HESI). METHODS: The reliability and validity of the K-HESI were examined in a large scale multi-site survey involving 7110 medical students...
November 24, 2016: BMC Medical Education
https://www.readbyqxmd.com/read/27833786/a-simple-and-sensitive-method-for-quantitative-measurement-of-methylmalonic-acid-by-turbulent-flow-chromatography-and-tandem-mass-spectrometry
#20
A G Tecleab, R C Schofield, L V Ramanathan, Dean C Carlow
A simple and sensitive method for the detection of methylmalonic acid in serum without derivatization has been developed. This method implements protein precipitation using methanol followed by additional sample clean up by turbulent flow liquid chromatography (TFLC). The sample was directly injected into the turbulent flow liquid chromatography tandem mass spectrometry system (TFLC-MS/MS) for online extraction followed by HPLC separation. The eluent was transferred to the mass spectrometer and ionized by heated electrospray negative ionization (HESI) and the analyte was quantified using a six-point calibration curve...
October 2016: Journal of Chromatography & Separation Techniques
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