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Yuhui Zhou, Zhenling Zeng, Jingxian Yu, Rong Liu, Lihua Pan, Qiuyu Zhong, Hong Chen
A method for the simultaneous determination of trypanocidal diminazene aceturate (DIM) and isometamidium chloride (ISM) that containing benzamidine groups in cattle tissues was developed by high performance liquid chromatography (HPLC) with solid-phase extraction (SPE). The tissue samples were extracted with different proportions of water-acetonitrile, then were cleaned up by Oasis WCX cartridges. DIM and ISM were separated by HPLC with a Spherisorb CN column (250 mm×4.6 mm, 5 μm). Acetonitrile-0.05 mol/L ammonium formate solution (pH 2...
September 8, 2017: Se Pu, Chinese Journal of Chromatography
Huan Yun, Xin Liu, Jie Cui, Jing Yang, Ying Liu
A method for screening of acidity regulators in dairy based on ion chromatography-high resolution mass spectrometry technology (IC-HRMS) was set up. The dairy samples were extracted by KOH (pH 7-8) and Oasis MAX SPE column, and separated by a Dionex IonPac AS11-HC column (250 mm×4 mm). All the acidity regulators were detected by Orbitrap full scan mode. Taking six organic acids as an example, the calibration curves showed good linearities in the range of 0.05-5.00 mg/L, and the correlation coefficients (r) were higher than 0...
August 8, 2017: Se Pu, Chinese Journal of Chromatography
Shiyan Li, Yang Wang, Dingnan Wang, Hongxi Wu, Xueyan Ding, Yiwei Cui, Qing Shen
An analytical method was developed for the simultaneous and rapid determination of seven microcystins in fish meat by liquid chromatography-tandem mass spectrometry (LC-MS/MS) coupled with pass-through solid phase extraction (SPE). The samples were extracted with methanol-water (90:10, v/v) after heat treatment by water bath at 80℃, and then cleaned up with an Oasis PRiME HLB pass-through SPE column. The samples were analyzed directly on a Waters XSelect HSS T3 column using 0.1% (v/v) aqueous formic acid and acidified acetonitrile (0...
August 8, 2017: Se Pu, Chinese Journal of Chromatography
Man-Yung Cheuk, Yun-Chuen Lo, Wing-Tat Poon
The measurement of urine catecholamine and metanephrine concentrations is important for biochemical screening and diagnosis of pheochromocytoma. The goal of this work was to develop a simple liquid chromatography-tandem mass spectrometry (LC-MS/MS) method for determining catecholamines and metanephrines in urine to replace an existing liquid chromatographic method using electrochemical detection. Urine samples were prepared using Oasis weak-cation-exchange cartridges. The eluate was analyzed on an Agilent ZORBAX Eclipse Plus Phenyl-Hexyl column in 3 min...
October 8, 2017: Se Pu, Chinese Journal of Chromatography
Misha Sra, Sergio Garrido-Jurado, Pattie Maes
We present Oasis, a novel system for automatically generating immersive and interactive virtual reality environments for single and multiuser experiences. Oasis enables real-walking in the generated virtual environment by capturing indoor scenes in 3D and mapping walkable areas. It makes use of available depth information for recognizing objects in the real environment which are paired with virtual counterparts to leverage the physicality of the real world, for a more immersive virtual experience. Oasis allows co-located and remotely located users to interact seamlessly and walk naturally in a shared virtual environment...
October 13, 2017: IEEE Transactions on Visualization and Computer Graphics
N Fontanals, R M Marcé, F Borrull
Synthetic cathinones have become popular in recent years, which would explain why their determination in influent sewage samples has already been documented. In the present study a method based on solid-phase extraction followed by liquid chromatography and high resolution mass spectrometry is developed, validated and applied to determine twelve cathinones and one of their metabolites in different environmental samples including influent and effluent sewage and river water. Two cation-exchange sorbents (Oasis MCX and Oasis WCX) were compared, with better results achieved with Oasis WCX in terms of apparent recoveries (70-100%) and matrix effects (lower than -34%)...
October 4, 2017: Journal of Chromatography. A
Jakob Gustavsson, Lutz Ahrens, Minh A Nguyen, Sarah Josefsson, Dan Berggren Kleja, Karin Wiberg
The influence of natural organic matter (NOM) on the solid-phase extraction (SPE) efficiency was investigated for legacy and emerging flame retardants (FRs; n=26) in surface water. Three different groups of FRs were analyzed: polybrominated diphenyl ethers (PBDEs), halogenated flame retardants (HFRs), and organophosphorus flame retardants (OPFRs). In addition, five sorbents (Amberlite XAD-2, Amberlite IRA-743, Oasis HLB, Chromabond HR-P, and Chromabond HR-X) were evaluated for the extraction of FRs (n=33) in water, of which Oasis HLB eluted with dichloromethane and acetone:n-hexane (1:1, v/v) provided the highest overall recoveries...
October 5, 2017: Journal of Chromatography. A
Nathan M Muncy, Ariana M Hedges-Muncy, C Brock Kirwan
Pre-processing MRI scans prior to performing volumetric analyses is common practice in MRI studies. As pre-processing steps adjust the voxel intensities, the space in which the scan exists, and the amount of data in the scan, it is possible that the steps have an effect on the volumetric output. To date, studies have compared between and not within pipelines, and so the impact of each step is unknown. This study aims to quantify the effects of pre-processing steps on volumetric measures in T1-weighted scans within a single pipeline...
2017: PloS One
Joanne H Lee, Helen Mi, Rachel Lim, Su Ling Ho, Wee Kiak Lim, Stephen C Teoh, Rupesh Agrawal
PURPOSE: To report the pattern of posterior and panuveitis at a tertiary referral center in Singapore. METHODS: Subgroup retrospective analysis of 334 new posterior and panuveitis cases, from the Ocular Autoimmune Systemic Inflammatory Infectious Study (OASIS) database. Descriptive analysis was performed and visual outcome and complications were reported. RESULTS: The etiology for posterior uveitis and panuveitis was infectious in 162 patients (48...
October 9, 2017: Ocular Immunology and Inflammation
J Eldon Molto, Odile Loreille, Elizabeth K Mallott, Ripan S Malhi, Spence Fast, Jennifer Daniels-Higginbotham, Charla Marshall, Ryan Parr
The curse of ancient Egyptian DNA was lifted by a recent study which sequenced the mitochondrial genomes (mtGenome) of 90 ancient Egyptians from the archaeological site of Abusir el-Meleq. Surprisingly, these ancient inhabitants were more closely related to those from the Near East than to contemporary Egyptians. It has been accepted that the timeless highway of the Nile River seeded Egypt with African genetic influence, well before pre-Dynastic times. Here we report on the successful recovery and analysis of the complete mtGenome from a burial recovered from a remote Romano-Christian cemetery, Kellis 2 (K2)...
October 6, 2017: Genes
Elisabeth A Goldman, Geeta N Eick, Devan Compton, Paul Kowal, J Josh Snodgrass, Dan T A Eisenberg, Kirstin N Sterner
OBJECTIVES: Telomere length (TL) is a biomarker of aging and age-related decline. Although venous blood is considered the "gold standard" for TL measurement, its collection is often not feasible or desired in nonclinical settings. Saliva and dried blood spots (DBS) have been used as alternatives when venipuncture cannot be performed. However, it is not known whether these sample types yield TL measurements comparable to those obtained from venous blood. We sought to determine whether different samples from the same individual yield comparable TL measurements...
September 26, 2017: American Journal of Human Biology: the Official Journal of the Human Biology Council
Zohaib Khurshid, Syed Faraz Moin, Rabia Sannam Khan, Muhammad Atif Saleem Agwan, Abdullah Hamed Alwadaani, Muhammad Sohail Zafar
OBJECTIVE: The aim of the current study was to carry out a preliminary validation of devices for standardized collection of whole mouth fluid (WMF) in comparison to the passive drooling method for protein analysis in healthy subjects. MATERIALS AND METHODS: A carefully designed sample collection/pretreatment protocol is crucial to the success of any saliva proteomics project. In this study, WMF was collected from healthy volunteers (n = 10, ages: 18-26 years). Individuals with any oral disease were excluded from the study group...
July 2017: European Journal of Dentistry
Lucy Lee, Lionel D Lewis
No abstract text is available yet for this article.
October 2017: Journal of Clinical Pharmacology
Mercedes Becerra-Herrera, Valentina Miranda, Daniel Arismendi, Pablo Richter
A combination of rotating disk sorptive extraction (RDSE) using Oasis® HLB as the sorbent phase and gas chromatography mass spectrometry (GC-MS) has been performed for the determination of four of the most widely used parabens: methylparaben, ethylparaben, propylparaben and n-butylparaben. The extraction and derivatization of the analytes in water samples were optimized by using factorial (screening) and Doehlert designs, thus reducing the number of analyses with the concomitant reduction of time, reagents, waste, samples and cost...
January 1, 2018: Talanta
Ulla Waldenström, Cecilia Ekéus
BACKGROUND: Obstetric anal sphincter injury (OASI) is a rare but serious outcome of vaginal birth. Based on concerns about the increasing number of women who commence childbearing later than previous generation, this study aimed at investigating age-related risk of OASI in women of different parity. METHODS: A population-based register study including 959,559 live singleton vaginal births recorded in the Swedish Medical Birth Register 1999 to 2011. In each parity group risks of OASI at age 25-29 years, 30-34 years, and ≥35 years compared with age < 25 years were investigated by logistic regression analyses, adjusted for year of birth, education, region of birth, smoking, Body Mass Index, infant birthweight and fetal presentation; and in parous women, history of OASI and cesarean section...
September 15, 2017: BMC Pregnancy and Childbirth
Michele S OʼShea, Christina Lewicky-Gaupp, Dana R Gossett
OBJECTIVES: Obstetric anal sphincter injuries (OASIS) are associated with severe short and long-term morbidities, although little is known about the long-term sexual function or satisfaction of women and partners of women with history of OASIS. The objective of this study was to describe the long-term sexual function and satisfaction of women who previously sustained OASIS and to assess sexual satisfaction among their male partners. METHODS: This was a follow-up study of participants enrolled in the For Optimal Recovery: Care After Severe Tears (FORCAST) prospective cohort study of women with a history of OASIS after delivery of a full-term singleton infant between 2011 and 2013...
September 13, 2017: Female Pelvic Medicine & Reconstructive Surgery
Sara Salvatierra Virgen, Silvia Guillermina Ceballos-Magaña, Vilma Del Carmen Salvatierra-Stamp, Maria Teresa Sumaya-Martínez, Francisco Javier Martínez-Martínez, Roberto Muñiz-Valencia
In recent years, there has been an increased concern about the presence of toxic compounds derived from the Maillard reaction produced during food cooking at high temperatures. The main toxic compounds derived from this reaction are acrylamide and hydroxymethylfurfural (HMF). The majority of analytical methods require sample treatments using solvents which are highly polluting for the environment. The difficulty for quantifying HMF in complex fried food matrices encourages the development of new analytical methods...
September 15, 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
Pablo Cruz-Morales, Hilda E Ramos-Aboites, Cuauhtémoc Licona-Cassani, Nelly Selem-Mójica, Paulina M Mejía-Ponce, Valeria Souza-Saldívar, Francisco Barona-Gómez
Desferrioxamines are hydroxamate siderophores widely conserved in both aquatic and soil-dwelling Actinobacteria. While the genetic and enzymatic bases of siderophore biosynthesis and their transport in model families of this phylum are well understood, evolutionary studies are lacking. Here, we perform a comprehensive desferrioxamine-centric (des genes) phylogenomic analysis, which includes the genomes of six novel strains isolated from an iron and phosphorous depleted oasis in the Chihuahuan desert of Mexico...
September 1, 2017: FEMS Microbiology Ecology
Amy Maxmen
No abstract text is available yet for this article.
September 13, 2017: Nature
Daniel Freeman, Bryony Sheaves, Guy M Goodwin, Ly-Mee Yu, Alecia Nickless, Paul J Harrison, Richard Emsley, Annemarie I Luik, Russell G Foster, Vanashree Wadekar, Christopher Hinds, Andrew Gumley, Ray Jones, Stafford Lightman, Steve Jones, Richard Bentall, Peter Kinderman, Georgina Rowse, Traolach Brugha, Mark Blagrove, Alice M Gregory, Leanne Fleming, Elaine Walklet, Cris Glazebrook, E Bethan Davies, Chris Hollis, Gillian Haddock, Bev John, Mark Coulson, David Fowler, Katherine Pugh, John Cape, Peter Moseley, Gary Brown, Claire Hughes, Marc Obonsawin, Sian Coker, Edward Watkins, Matthias Schwannauer, Kenneth MacMahon, A Niroshan Siriwardena, Colin A Espie
BACKGROUND: Sleep difficulties might be a contributory causal factor in the occurrence of mental health problems. If this is true, improving sleep should benefit psychological health. We aimed to determine whether treating insomnia leads to a reduction in paranoia and hallucinations. METHODS: We did this single-blind, randomised controlled trial (OASIS) at 26 UK universities. University students with insomnia were randomly assigned (1:1) with simple randomisation to receive digital cognitive behavioural therapy (CBT) for insomnia or usual care, and the research team were masked to the treatment...
October 2017: Lancet Psychiatry
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