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https://www.readbyqxmd.com/read/28213223/electrochemical-determination-of-arsenic-in-natural-waters-using-carbon-fiber-ultra-microelectrodes-modified-with-gold-nanoparticles
#1
Patricio Carrera, Patricio J Espinoza-Montero, Lenys Fernández, Hugo Romero, José Alvarado
We have developed an anodic stripping voltammetry method that employs carbon fiber ultra-microelectrodes modified with gold nanoparticles to determine arsenic in natural waters. Gold nanoparticles were potentiostatically deposited on carbon fiber ultra-microelectrodes at -0.90V (vs SCE) for a time of 15s, to form the carbon fiber ultra-microelectrodes modified with gold nanoparticles. Cyclic voltammetry, electrochemical impedance spectroscopy and scanning electron microscopy coupled to an X-ray microanalysis system were used to check and confirm the presence of gold nanoparticles on the carbon fiber ultra-microelectrodes...
May 1, 2017: Talanta
https://www.readbyqxmd.com/read/28207879/comparison-of-hla-allelic-imputation-programs
#2
Jason H Karnes, Christian M Shaffer, Lisa Bastarache, Silvana Gaudieri, Andrew M Glazer, Heidi E Steiner, Jonathan D Mosley, Simon Mallal, Joshua C Denny, Elizabeth J Phillips, Dan M Roden
Imputation of human leukocyte antigen (HLA) alleles from SNP-level data is attractive due to importance of HLA alleles in human disease, widespread availability of genome-wide association study (GWAS) data, and expertise required for HLA sequencing. However, comprehensive evaluations of HLA imputations programs are limited. We compared HLA imputation results of HIBAG, SNP2HLA, and HLA*IMP:02 to sequenced HLA alleles in 3,265 samples from BioVU, a de-identified electronic health record database coupled to a DNA biorepository...
2017: PloS One
https://www.readbyqxmd.com/read/28206760/nano-engineered-eggshell-silver-tailored-co-polyester-polymer-blend-film-with-antimicrobial-properties
#3
Boniface J Tiimob, Gregory Mwinyelle, Woubit Abdela, Temesgen Samuel, Shaik Jeelani, Vijaya K Rangari
In this study, the reinforcement effect of different proportions of eggshell/silver nanomaterial (ES-Ag) on structural and antimicrobial properties of 70/30 poly (butylene-co-adipate terephthalate)/polylactic acid (PBAT/PLA) immiscible blends were investigated. The ES-Ag was synthesized using a single step ball milling process, and characterized with X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). These results confirmed the existence of silver nanoparticles (Ag NPs) in the interstitial spaces of the eggshell particles...
February 16, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28203683/identification-of-unique-venous-thromboembolism-susceptibility-variants-in-african-americans
#4
John A Heit, Sebastian M Armasu, Bryan M McCauley, Iftikhar J Kullo, Hugues Sicotte, Jyotishman Pathak, Christopher G Chute, Omri Gottesman, Erwin P Bottinger, Joshua C Denny, Dan M Roden, Rongling Li, Marylyn D Ritchie, Mariza de Andrade
To identify novel single nucleotide polymorphisms (SNPs) associated with venous thromboembolism (VTE) in African-Americans (AAs), we performed a genome-wide association study (GWAS) of VTE in AAs using the Electronic Medical Records and Genomics (eMERGE) Network, comprised of seven sites each with DNA biobanks (total ~39,200 unique DNA samples) with genome-wide SNP data (imputed to 1000 Genomes Project cosmopolitan reference panel) and linked to electronic health records (EHRs). Using a validated EHR-driven phenotype extraction algorithm, we identified VTE cases and controls and tested for an association between each SNP and VTE using unconditional logistic regression, adjusted for age, sex, stroke, site-platform combination and sickle cell risk genotype...
February 16, 2017: Thrombosis and Haemostasis
https://www.readbyqxmd.com/read/28202855/early-and-late-atrial-arrhythmias-after-lung-transplantation%C3%A3-incidence-predictive-factors-and-impact-on-mortality
#5
Laurence Jesel, Jérémie Barraud, Han S Lim, Halim Marzak, Nathan Messas, Sandrine Hirschi, Nicola Santelmo, Anne Olland, Pierre Emmanuel Falcoz, Gilbert Massard, Michel Kindo, Patrick Ohlmann, Michel Chauvin, Olivier Morel, Romain Kessler
BACKGROUND: Atrial arrhythmias (AAs) are frequent after lung transplantation (LT) and late postoperatively. Several predictive factors of early postoperative AAs after LT have been identified but those of late AAs remain unknown. Whether AA after LT affects mortality is still being debated. This study assessed in a large cohort of LT patients the incidence of AAs early and late after surgery, their predictive factors and their effect on mortality.Methods and Results:We studied 271 consecutive LT patients over 9 years...
February 15, 2017: Circulation Journal: Official Journal of the Japanese Circulation Society
https://www.readbyqxmd.com/read/28199370/extra-nodal-extension-is-a-significant-prognostic-factor-in-lymph-node-positive-breast-cancer
#6
Sura Aziz, Elisabeth Wik, Gøril Knutsvik, Tor Audun Klingen, Ying Chen, Benedicte Davidsen, Hans Aas, Turid Aas, Lars A Akslen
Presence of lymph node (LN) metastasis is a strong prognostic factor in breast cancer, whereas the importance of extra-nodal extension and other nodal tumor features have not yet been fully recognized. Here, we examined microscopic features of lymph node metastases and their prognostic value in a population-based cohort of node positive breast cancer (n = 218), as part of the prospective Norwegian Breast Cancer Screening Program NBCSP (1996-2009). Sections were reviewed for the largest metastatic tumor diameter (TD-MET), nodal afferent and efferent vascular invasion (AVI and EVI), extra-nodal extension (ENE), number of ENE foci, as well as circumferential (CD-ENE) and perpendicular (PD-ENE) diameter of extra-nodal growth...
2017: PloS One
https://www.readbyqxmd.com/read/28198437/increased-nutrient-availability-in-dense-breast-tissue-of-postmenopausal-women-in-vivo
#7
Annelie Abrahamsson, Anna Rzepecka, Charlotta Dabrosin
Metabolic reprogramming is a hallmark of cancer. Nutrient availability in the tissue microenvironment determines cellular events and may play a role in breast carcinogenesis. High mammographic density is an independent risk factor for breast cancer. Whether nutrient availability differs in normal breast tissues with various densities is unknown. Therefore we investigated whether breast tissues with various densities exhibited differences in nutrient availability. Healthy postmenopausal women from the regular mammographic screening program who had either predominantly fatty breast tissue (nondense), n = 18, or extremely dense breast tissue (dense), n = 20, were included...
February 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28193366/development-of-c60-based-labeling-reagents-for-the-determination-of-low-molecular-weight-compounds-by-matrix-assisted-laser-desorption-ionization-mass-i-determination-of-amino-acids-in-microliter-biofluids
#8
Pin Wu, Hua-Ming Xiao, Jun Ding, Qian-Yun Deng, Fang Zheng, Yu-Qi Feng
Quantification of low molecular weight compounds (<800 Da) using matrix assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI MS) is challenging due to the matrix signal interference at low m/z region and poor reproducibility of MS responses. In this study, a C60 labeling-MALDI MS strategy was proposed for the fast, sensitive and reliable determination of amino acids (AAs) in biofluids. An N-hydroxysuccinimide functionalized C60 was synthesized as the labeling reagent and added as an 880 Da tag to AAs; a carboxyl acid containing C60 was employed as the internal standards to normalize MS variations...
April 1, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28192127/long-term-treatment-with-nandrolone-decanoate-impairs-mesenteric-vascular-relaxation-in-both-sedentary-and-exercised-female-rats
#9
Izabela F Caliman, Cristian S Bernabe, Antônio F de Melo, Girlândia A Brasil, Andrews M do Nascimento, Ewelyne M de Lima, Suely G Figueiredo, Tadeu U de Andrade, Nazaré S Bissoli
Nandrolone Decanoate (ND) is an Anabolic Androgenic Steroid (AAS) that under abusive regimen can lead to multiple physiological adverse effects. Studies of AAS-mediated cardiovascular (CV) alterations were mostly taken from male subjects, even though women are also susceptible to the effects of AAS and gender-specific differences in susceptibility to vascular diseases exist. Here we investigate ND-induced vascular reactivity alterations in both sedentary and exercised female rats and whether these alterations depend on endothelium-derived factors...
February 9, 2017: Steroids
https://www.readbyqxmd.com/read/28187732/comparative-studies-on-the-multi-component-pharmacokinetics-of-aristolochiae-fructus-and-honey-fried-aristolochiae-fructus-extracts-after-oral-administration-in-rats
#10
Jinbin Yuan, Gang Ren, Jian Liang, Chong-Zhi Wang, Zhihong Yan, Qun Huang, Jiankang Li, Yang Chen, Yi Tang, Xiaofei Liu, Chun-Su Yuan
BACKGROUND: Aristolochiae Fructus (AF) and honey-fried Aristolochiae Fructus (HAF) have been used in China for a long time as anti-tussive and expectorant drugs. Few clinical cases have been reported to be associated with the toxicity of AF and HAF, although relatively high amounts of aristolochic acids (AAs) have been found in them. Our previous experiments have verified from the chemical changes and from traditional toxicology that honey-processing can significantly reduce the toxicity of AF...
February 10, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/28187045/apolipoprotein-l1-and-chronic-kidney-disease-risk-in-young-potential-living-kidney-donors
#11
Jayme E Locke, Deirdre Sawinski, Rhiannon D Reed, Brittany Shelton, Paul A MacLennan, Vineeta Kumar, Shikha Mehta, Roslyn B Mannon, Robert Gaston, Bruce A Julian, John J Carr, James G Terry, Meredith Kilgore, Allan B Massie, Dorry L Segev, Cora E Lewis
OBJECTIVE: The aim of this study was to develop a novel chronic kidney disease (CKD) risk prediction tool for young potential living kidney donors. SUMMARY OF BACKGROUND DATA: Living kidney donor selection practices have evolved from examining individual risk factors to a risk calculator incorporating multiple characteristics. Owing to limited long-term data and lack of genetic information, current risk tools lack precision among young potential living kidney donors, particularly African Americans (AAs)...
February 9, 2017: Annals of Surgery
https://www.readbyqxmd.com/read/28182139/assessing-behavioral-patterns-of-internet-addiction-and-drug-abuse-among-high-school-students
#12
Zeinab Nemati, Hossein Matlabi
BACKGROUND: Internet addiction and drug abuse isolate adolescents from their family and friends and cause damage to their health, relations, emotions, and spirit. In the society, adolescents' addiction extracts high cost on health care, educational failure and mental health services. OBJECTIVES: The aim of this study was to assess the behavioral patterns of Internet and drug addiction among urban and rural students in Urmia, Iran. METHODS: A sectional and descriptive-analytical approach with stratified sampling method was employed to recruit 385 high school students from urban and rural areas...
2017: Psychology Research and Behavior Management
https://www.readbyqxmd.com/read/28181729/the-dietary-protein-paradox-and-threonine-15-n-depletion-pyridoxal-5-phosphate-enzyme-activity-as-a-mechanism-for-the-%C3%AE-15-n-trophic-level-effect
#13
B T Fuller, K J Petzke
RATIONALE: Nitrogen stable isotope ratios (δ(15) N values) are used to reconstruct dietary patterns, but the biochemical mechanism(s) responsible for the diet to tissue trophic level effect and its variability are not fully understood. Here δ(15) N amino acid (AA) values and physiological measurements (nitrogen intake, plasma albumin concentrations, liver reduced glutathione concentrations and leucine oxidation rates) are used to investigate increased dietary protein consumption and oxidative stress (vitamin E deficiency) in rat total plasma protein...
February 9, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28181294/adverse-outcomes-associated-with-postoperative-atrial-arrhythmias-after-lung-transplantation-a-meta-analysis-and-systematic-review-of-the-literature
#14
REVIEW
Nathan H Waldron, Rebecca Y Klinger, Matthew G Hartwig, Laurie D Snyder, James P Daubert, Joseph P Mathew
BACKGROUND: Postoperative atrial arrhythmias (AAs) are common after lung transplantation but studies are mixed regarding their impact on outcomes. We therefore performed this systematic review and meta-analysis to determine whether AAs after lung transplantation impede postoperative recovery. METHODS: MEDLINE, EMBASE, CINAHL, and the Cochrane Register were searched to identify studies comparing outcomes in adult patients undergoing lung transplantation who experienced postoperative AAs in the immediate postoperative period versus those without postoperative AAs...
February 9, 2017: Clinical Transplantation
https://www.readbyqxmd.com/read/28179209/administration-of-anabolic-steroid-during-adolescence-induces-long-term-cardiac-hypertrophy-and-increases-susceptibility-to-ischemia-reperfusion-injury-in-adult-wistar-rats
#15
Fernando de Azevedo Cruz Seara, Raiana Andrade Quintanilha Barbosa, Dahienne Ferreira de Oliveira, Diorney Luiz Souza Gran da Silva, Adriana Bastos Carvalho, Andrea Claudia Freitas Ferreira, José Hamilton Matheus Nascimento, Emerson Lopes Olivares
Chronic administration of anabolic androgenic steroids (AAS) in adult rats results in cardiac hypertrophy and increased susceptibility to myocardial ischemia/reperfusion (IR) injury. Molecular analyses demonstrated that hyperactivation of type 1 angiotensin II (AT1) receptor mediates cardiac hypertrophy induced by AAS and also induces down-regulation of myocardial ATP-sensitive potassium channel (KATP), resulting in loss of exercise-induced cardioprotection. Exposure to AAS during adolescence promoted long-term cardiovascular dysfunctions, such as dysautonomia...
February 5, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28178031/effect-of-ugt2b10-ugt2b17-fmo3-and-oct2-genetic-variation-on-nicotine-and-cotinine-pharmacokinetics-and-smoking-in-african-americans
#16
Taraneh Taghavi, Gideon St Helen, Neal L Benowitz, Rachel F Tyndale
OBJECTIVES: Nicotine metabolism rates differ considerably among individuals, even after controlling for variation in the major nicotine-metabolizing enzyme, CYP2A6. In this study, the impact of genetic variation in alternative metabolic enzymes and transporters on nicotine and cotinine (COT) pharmacokinetics and smoking was investigated. METHODS: We examined the impact of UGT2B10, UGT2B17, FMO3, NAT1, and OCT2 variation on pharmacokinetics and smoking (total nicotine equivalents and topography) before and after stratifying by CYP2A6 genotype in 60 African American (AA) smokers who received a simultaneous intravenous infusion of deuterium-labeled nicotine and COT...
February 7, 2017: Pharmacogenetics and Genomics
https://www.readbyqxmd.com/read/28176297/ptsd-psychotropic-medication-use-and-the-risk-of-dementia-among-us-veterans-a-retrospective-cohort-study
#17
Francis Mawanda, Robert B Wallace, Kimberly McCoy, Thad E Abrams
OBJECTIVE: To determine the associations between PTSD, psychotropic medication use, and the risk for dementia. DESIGN: Retrospective cohort. PARTICIPANTS: Nationwide sample of US veterans (N = 417,172) aged ≥56 years during fiscal year (FY) 2003 without a diagnosis of dementia or mild cognitive impairment at baseline (FY02-03) and ≥1 clinical encounter every 2 years during follow-up (FY04-12). MEASURES: Demographic characteristics; diagnosis of PTSD, dementia, and medical and psychiatric comorbidity (defined by ICD-9 codes); and psychotropic medication use including selective serotonin reuptake inhibitors (SSRI), serotonin-norepinephrine reuptake inhibitors (SNRI), novel antidepressants (NA), benzodiazepines (BZA), and atypical antipsychotics (AA)...
February 8, 2017: Journal of the American Geriatrics Society
https://www.readbyqxmd.com/read/28173764/-medically-unexplained-symptoms-and-symptom-disorders-in-primary-care-prognosis-based-recognition-and-classification
#18
EDITORIAL
Marianne Rosendal, Tim C Olde Hartman, Aase Aamland, Henriette van der Horst, Peter Lucassen, Anna Budtz-Lilly, Christopher Burton
BACKGROUND: Many patients consult their GP because they experience bodily symptoms. In a substantial proportion of cases, the clinical picture does not meet the existing diagnostic criteria for diseases or disorders. This may be because symptoms are recent and evolving or because symptoms are persistent but, either by their character or the negative results of clinical investigation cannot be attributed to disease: so-called "medically unexplained symptoms" (MUS). MUS are inconsistently recognised, diagnosed and managed in primary care...
February 7, 2017: BMC Family Practice
https://www.readbyqxmd.com/read/28168203/microvesicles-correlated-with-components-of-metabolic-syndrome-in-men-with-type-2-diabetes-mellitus-and-lowered-testosterone-levels-but-were-unaltered-by-testosterone-therapy
#19
Jaco Botha, Line Velling Magnussen, Morten Hjuler Nielsen, Tine Bo Nielsen, Kurt Højlund, Marianne Skovsager Andersen, Aase Handberg
Aims. To investigate how circulating microvesicle phenotypes correlate with insulin sensitivity, body composition, plasma lipids, and hepatic fat accumulation. We hypothesized that changes elicited by testosterone replacement therapy are reflected in levels of microvesicles. Methods. Thirty-nine type 2 diabetic males with lowered testosterone levels were assigned to either testosterone replacement therapy or placebo and evaluated at baseline and after 24 weeks. Microvesicles were analysed by flow cytometry and defined as lactadherin-binding particles within the 0...
2017: Journal of Diabetes Research
https://www.readbyqxmd.com/read/28165486/alcohol-and-nicotine-codependence-associated-dna-methylation-changes-in-promoter-regions-of-addiction-related-genes
#20
Hongqin Xu, Fan Wang, Henry R Kranzler, Joel Gelernter, Huiping Zhang
Altered DNA methylation in addiction-related genes may modify the susceptibility to alcohol or drug dependence (AD or ND). We profiled peripheral blood DNA methylation levels of 384 CpGs in promoter regions of 82 addiction-related genes in 256 African Americans (AAs) (117 cases with AD-ND codependence and 139 controls) and 196 European Americans (103 cases with AD-ND codependence and 93 controls) using Illumina's GoldenGate DNA methylation array assays. AD-ND codependence-associated DNA methylation changes were analyzed using linear mixed-effects models with consideration of batch effects and covariates age, sex, and ancestry proportions...
February 6, 2017: Scientific Reports
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