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https://www.readbyqxmd.com/read/28535444/passive-detection-of-pb-in-water-using-rock-phosphate-agarose-beads
#1
Harry M Edenborn, Bret H Howard, James I Sams, Dorothy J Vesper, Sherie L Edenborn
In this study, passive detectors for Pb were prepared by immobilizing powdered rock phosphate in agarose beads. Rock phosphate has been used to treat Pb-contaminated waters and soil by fixing the metal as an insoluble pyromorphite mineral. Under lab conditions, Pb was rapidly adsorbed from aqueous solution by the beads over time, consistent with the acidic dissolution of rock phosphate, the precipitation of pyromorphite within the pore space of the agarose gel matrix, and surface exchange reactions. Net accumulation of Pb occurred when beads were exposed to simulated periodic releases of Pb over time...
April 15, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28535308/invited-commentary-the-contribution-to-the-field-of-nutritional-epidemiology-of-the-landmark-1985-publication-by-willett-et-al
#2
Amy F Subar, Lawrence H Kushi, Jennifer L Lerman, Laurence S Freedman
The semiquantitative food frequency questionnaire (FFQ) has been the primary source of dietary exposure data in epidemiology for decades. Although frequency instruments had been evaluated before the 1985 publication "Reproducibility and Validity of a Semiquantitative Food Frequency Questionnaire" by Willett et al. (Am J Epidemiol. 1985;122(1):51-65), that paper was the prototype for the development and validation of what was then a highly innovative method for collecting dietary data. This approach was adopted in nearly all subsequent cohort studies of diet and disease...
May 23, 2017: American Journal of Epidemiology
https://www.readbyqxmd.com/read/28535300/magnitude-and-allele-frequency-of-cry1f-resistance-in-field-populations-of-the-fall-armyworm-lepidoptera-noctuidae-in-brazil
#3
O F Santos-Amaya, C S Tavares, J V C Rodrigues, T C Souza, N Rodrigues-Silva, R N C Guedes, A P Alves, E J G Pereira
Bacillus thuringiensis (Bt) corn producing the Cry1F protein was the first highly efficacious Bt corn deployed against the fall armyworm Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) in Brazil, but reduced efficacy of this technology against the fall armyworm has been reported in some regions of the country. Here, we surveyed Cry1F resistance allele frequency and susceptibility of eight S. frugiperda populations collected in 2013 from non-Bt fields in different regions of Brazil. In F1 screen experiments, the overall frequency of the Cry1F resistance alleles in Brazilian populations was estimated at 0...
May 23, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28535294/hgva-the-human-genome-variation-archive
#4
Javier Lopez, Jacobo Coll, Matthias Haimel, Swaathi Kandasamy, Joaquin Tarraga, Pedro Furio-Tari, Wasim Bari, Marta Bleda, Antonio Rueda, Stefan Gräf, Augusto Rendon, Joaquin Dopazo, Ignacio Medina
High-profile genomic variation projects like the 1000 Genomes project or the Exome Aggregation Consortium, are generating a wealth of human genomic variation knowledge which can be used as an essential reference for identifying disease-causing genotypes. However, accessing these data, contrasting the various studies and integrating those data in downstream analyses remains cumbersome. The Human Genome Variation Archive (HGVA) tackles these challenges and facilitates access to genomic data for key reference projects in a clean, fast and integrated fashion...
May 23, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28534995/low%C3%A2-level-mechanical-vibration-enhances-osteoblastogenesis-via-a-canonical-wnt-signaling%C3%A2-associated-mechanism
#5
Heqi Gao, Mingming Zhai, Pan Wang, Xuhui Zhang, Jing Cai, Xiaofei Chen, Guanghao Shen, Erping Luo, Da Jing
Osteoporosis is a skeletal metabolic disease characterized by reduced bone mass and a high susceptibility to fractures, in which osteoblasts and osteoclasts are highly involved in the abnormal bone remodeling processes. Recently, low‑magnitude, high‑frequency whole‑body vibration has been demonstrated to significantly reduce osteopenia experimentally and clinically. However, the underlying mechanism regarding how osteoblastic activity is altered when bone tissues adapt to mechanical vibration remains elusive...
May 19, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28534863/the-clinical-course-of-patients-with-preschool-manifestation-of-type-1-diabetes-is-independent-of-the-hla-dr-dq-genotype
#6
Christina Reinauer, Joachim Rosenbauer, Christina Bächle, Christian Herder, Michael Roden, Sian Ellard, Elisa De Franco, Beate Karges, Reinhard W Holl, Jürgen Enczmann, Thomas Meissner
INTRODUCTION: Major histocompatibility complex class II genes are considered major genetic risk factors for autoimmune diabetes. We analysed Human Leukocyte Antigen (HLA) DR and DQ haplotypes in a cohort with early-onset (age < 5 years), long term type 1 diabetes (T1D) and explored their influence on clinical and laboratory parameters. METHODS: Intermediate resolution HLA-DRB1, DQA1 and DQB1 typing was performed in 233 samples from the German Paediatric Diabetes Biobank and compared with a local control cohort of 19,544 cases...
May 19, 2017: Genes
https://www.readbyqxmd.com/read/28534809/an-improved-rd-algorithm-for-maneuvering-bistatic-forward-looking-sar-imaging-with-a-fixed-transmitter
#7
Yue Yuan, Si Chen, Huichang Zhao
In order to improve the azimuth resolution beyond what monostatic synthetic aperture radar (SAR) can achieve in the forward-looking area, an asymmetric configuration bistatic SAR system and its imaging algorithm are proposed in this paper. The transmitter is mounted on a fixed platform in side-looking mode while the receiver moves along a nonlinear trajectory in forward-looking mode. Due to the high velocity and acceleration of the maneuvering platform in both along-track and height direction, the traditional algorithms are no longer applicable...
May 19, 2017: Sensors
https://www.readbyqxmd.com/read/28534797/transition-icons-for-time-series-visualization-and-exploratory-analysis
#8
Paul Nickerson, Raheleh Baharloo, Amal A Wanigatunga, Todd D Manini, Patrick J Tighe, Parisa Rashidi
The modern healthcare landscape has seen the rapid emergence of techniques and devices which temporally monitor and record physiological signals. The prevalence of time series data within the healthcare field necessitates the development of methods which can analyze the data in order to draw meaningful conclusions. Time series behavior is notoriously difficult to intuitively understand due to its intrinsic high-dimensionality, which is compounded in the case of analyzing groups of time series collected from different patients...
May 16, 2017: IEEE Journal of Biomedical and Health Informatics
https://www.readbyqxmd.com/read/28534770/boscc-bag-of-spatial-context-correlations-for-spatially-enhanced-3d-shape-representation
#9
Zhizhong Han, Zhenbao Liu, Chi-Man Vong, Yu-Shen Liu, Shuhui Bu, Junwei Han, Philip Chen
Highly discriminative 3D shape representations can be formed by encoding the spatial relationship among virtual words into the Bag of Words (BoW) method. To achieve this challenging task, several unresolved issues in the encoding procedure must be overcome for 3D shapes, including i) arbitrary mesh resolution, ii) irregular vertex topology, iii) orientation ambiguity on the 3D surface and iv) invariance to rigid and non-rigid shape transformations. In this work, a novel spatially enhanced 3D shape representation called Bag of Spatial Context Correlations (BoSCC) is proposed to address all these issues...
May 16, 2017: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/28534769/a-systematic-investigation-of-lateral-estimation-using-various-interpolation-approaches-in-conventional-ultrasound-imaging
#10
Zhi Liu, Chengwu Huang, Jianwen Luo
Accurate lateral displacement and strain estimat- ion is critical for some applications of elasticity imaging. Typically, motion estimation in the lateral direction is challenging because of low sampling frequency and lack of phase information in conventional ultrasound imaging. Several approaches have been proposed to improve the performance of lateral estimation, such as lateral interpolation on the RF signals (Interp_RF), lateral interpolation on the cross-correlation function (Interp_CCF) and lateral interpolation on both the RF signals and cross-correlation function (Interp_Both)...
May 17, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28534728/hearing-loss-and-age-induced-changes-in-the-central-auditory-system-measured-by-the-p3-response-to-small-changes-in-frequency
#11
Kathy R Vander Werff, Kerrie L Nesbitt
BACKGROUND: Recent behavioral studies have suggested that individuals with sloping audiograms exhibit localized improvements in frequency discrimination in the frequency region near the drop in hearing. Auditory-evoked potentials may provide evidence of such cortical plasticity and reorganization of frequency maps. PURPOSE: The objective of this study was to evaluate electrophysiological evidence of cortical plasticity related to cortical frequency representation and discrimination abilities in older individuals with high-frequency sensorineural hearing loss (SNHL)...
May 2017: Journal of the American Academy of Audiology
https://www.readbyqxmd.com/read/28534644/a-spectral-power-analysis-of-driving-behavior-changes-during-the-transition-from-non-distraction-to-distraction
#12
Yuan Wang, Shan Bao, Wenjun Du, Zhirui Ye, James R Sayer
OBJECTIVE: This paper investigated and compared frequency-domain and time-domain characteristics of drivers' behavior before and after the start of distracted driving. METHOD: Data from an existing naturalistic driving study were used. Fast Fourier transform (FFT) was applied for the frequency domain analysis to explore drivers' behavior pattern changes between non-distracted (pre-starting of visual-manual task) and distracted (post-starting of visual-manual task) driving periods...
May 23, 2017: Traffic Injury Prevention
https://www.readbyqxmd.com/read/28534524/competing-risks-for-mortality-in-patients-with-asymptomatic-pancreatic-cystic-neoplasms-implications-for-clinical-management
#13
Karl Kwok, Jonathan Chang, Lewei Duan, Brian Z Huang, Bechien U Wu
OBJECTIVES: Pancreatic cystic neoplasms (PCNs) are being detected with increased frequency. Current clinical practice guidelines emphasize management based on cyst-related features. We aimed to evaluate the impact of comorbidity on mortality in PCN patients via competing risk analysis. METHODS: We analyzed a retrospective cohort of patients diagnosed between 2005-2010, with follow-up through 2015, for overall and cause-specific mortality. Comorbidities were classified by the Charlson comorbidity index...
May 23, 2017: American Journal of Gastroenterology
https://www.readbyqxmd.com/read/28534521/comprehensive-analysis-of-adverse-events-associated-with-per-oral-endoscopic-myotomy-in-1826-patients-an-international-multicenter-study
#14
Yamile Haito-Chavez, Haruhiro Inoue, Kristin W Beard, Peter V Draganov, Michael Ujiki, Burkhard H A Rahden, Pankaj N Desai, Mathieu Pioche, Bu Hayee, Amyn Haji, Payal Saxena, Kevin Reavis, Manabu Onimaru, Valerio Balassone, Jun Nakamura, Yoshitaka Hata, Dennis Yang, Davinderbir Pannu, Ali Abbas, Yaseen B Perbtani, Lava Y Patel, Jorg Filser, Sabine Roman, Jerome Rivory, Francois Mion, Thierry Ponchon, Silvana Perretta, Vivien Wong, Roberta Maselli, Saowanee Ngamruengphong, Yen-I Chen, Majidah Bukhari, Gulara Hajiyeva, Amr Ismail, Renata Pieratti, Vivek Kumbhari, Gerson Galdos-Cardenas, Alessandro Repici, Mouen A Khashab
OBJECTIVES: The safety of peroral endoscopic myotomy (POEM) is still debated since comprehensive analysis of adverse events (AEs) associated with the procedure in large multicenter cohort studies has not been performed. To study (1) the prevalence of AEs and (2) factors associated with occurrence of AEs in patients undergoing POEM. METHODS: Patients who underwent POEM at 12 tertiary-care centers between 2009 and 2015 were included in this case-control study. Cases were defined by the occurrence of any AE related to the POEM procedure...
May 23, 2017: American Journal of Gastroenterology
https://www.readbyqxmd.com/read/28534297/single-frequency-impedance-analysis-on-reduced-graphene-oxide-screen-printed-electrode-for-biomolecular-detection
#15
Rajesh, Shobhita Singal, Ravinder K Kotnala
A biofunctionalized reduced graphene oxide (rGO)-modified screen-printed carbon electrode (SPCE) was constructed as an immunosensor for C-reactive protein (CRP) detection, a biomarker released in early stage acute myocardial infarction. A different approach of single frequency analysis (SFA) study was utilized for the biomolecular sensing, by monitoring the response in phase angle changes obtained at an optimized frequency resulting from antigen-antibody interactions. A set of measurements were carried out to optimize a frequency where a maximum change in phase angle was observed, and in this case, we found it at around 10 Hz...
May 22, 2017: Applied Biochemistry and Biotechnology
https://www.readbyqxmd.com/read/28534275/sex-bias-in-pathogenesis-of-autoimmune-neuroinflammation-relevance-for-dimethyl-fumarate-immunomodulatory-anti-oxidant-action
#16
Zorica Stojić-Vukanić, Jelena Kotur-Stevuljević, Mirjana Nacka-Aleksić, Duško Kosec, Ivana Vujnović, Ivan Pilipović, Mirjana Dimitrijević, Gordana Leposavić
In the present study, upon showing sexual dimorphism in dimethyl fumarate (DMF) efficacy to moderate the clinical severity of experimental autoimmune encephalomyelitis (EAE) in Dark Agouti rats, cellular and molecular substrate of this dimorphism was explored. In rats of both sexes, DMF administration from the day of immunization attenuated EAE severity, but this effect was more prominent in males leading to loss of the sexual dimorphism observed in vehicle-administered controls. Consistently, in male rats, DMF was more efficient in diminishing the number of CD4+ T lymphocytes infiltrating spinal cord (SC) and their reactivation, the number of IL-17+ T lymphocytes and particularly cellularity of their highly pathogenic IFN-γ+GM-CSF+IL-17+ subset...
May 22, 2017: Molecular Neurobiology
https://www.readbyqxmd.com/read/28534117/a-multicenter-study-on-objective-and-subjective-benefits-with-a-transcutaneous-bone-anchored-hearing-aid-device-first-nordic-results
#17
Dan Dupont Hougaard, Soren Kjaergaard Boldsen, Anne Marie Jensen, Soren Hansen, Per Cayé Thomassen
Examination of objective as well as subjective outcomes with a new transcutaneous bone-anchored hearing aid device. The study was designed as a prospective multicenter consecutive case-series study involving tertiary referral centers at two Danish University Hospitals. A total of 23 patients were implanted. Three were lost to follow-up. Patients had single-sided deafness, conductive or mixed hearing loss. INTERVENTION: Rehabilitative. Aided and unaided sound field hearing was evaluated objectively using (1) pure warble tone thresholds, (2) pure-tone average (PTA4), (3) speech discrimination score (SDS) in quiet, and (4) speech reception threshold 50% at 70 dB SPL noise level (SRT50%)...
May 22, 2017: European Archives of Oto-rhino-laryngology
https://www.readbyqxmd.com/read/28534072/genotoxic-assessment-of-some-inorganic-compounds-in-desert-pupfish-cyprinodon-macularius-in-the-evaporation-pond-from-a-geothermal-plant
#18
Miguel Flores-Galván, Evarista Arellano-García, Gorgonio Ruiz-Campos, Luis Walter Daesslé
The frequency of micro nucleated erythrocytes in peripheral blood of the desert pupfish (Cyprinodon macularius) from a geothermal effluent pond is determined and compared to organisms kept in an aquarium. The frequency of micronucleated erythrocytes found in pupfish from the geothermal pond is 2.75 (±2.09) and only 0.44 (±0.52) in captivity organisms. Dissolved As in the ponds doubles the 340 µg L(-1) US-EPA acute quality criteria for aquatic life and Hg equals the 1.77 µg L(-1) chronic criteria. The organisms with high MNE also have significantly high Se, As and Hg concentrations in muscle and liver...
May 22, 2017: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28534047/polysomnographic-heart-rate-variability-indices-and-atrial-ectopy-associated-with-incident-atrial-fibrillation-risk-in-older-community-dwelling-men
#19
Dileep Raman, Farhad Kaffashi, Li-Yung Lui, William H Sauer, Susan Redline, Peter Stone, Peggy M Cawthon, Katie L Stone, Kristine E Ensrud, Sonia Ancoli-Israel, Kenneth Loparo, Reena Mehra
BACKGROUND: Autonomic dysfunction contributes to atrial fibrillation (AF). OBJECTIVE: We hypothesized that polysomnogram (PSG)-based heart rate variability (HRV) autonomic function biomarkers are associated with incident AF and these associations are modified by measures of sleep disordered breathing (SDB). METHODS: 2350 participants of a multi-center prospective study (Outcomes of Sleep Disorders in Older Men Study) without baseline AF underwent sleep studies with incident adjudicated AF follow up (8...
May 2017: JACC. Clinical Electrophysiology
https://www.readbyqxmd.com/read/28534034/clinical-and-mucosal-immune-correlates-of-hiv-1-semen-levels-in-antiretroviral-naive-men
#20
Brendan J W Osborne, Angie K Marsh, Sanja Huibner, Kamnoosh Shahabi, Cindy Liu, Tania Contente, Nico J D Nagelkerke, Colin Kovacs, Erika Benko, Lance Price, Kelly S MacDonald, Rupert Kaul
BACKGROUND: This study was done to characterize parameters associated with semen human immunodeficiency virus (HIV)-1 ribonucleic acid (RNA) viral load (VL) variability in HIV-infected, therapy-naive men. METHODS: Paired blood and semen samples were collected from 30 HIV-infected, therapy-naive men who have sex with men, and 13 participants were observed longitudinally for up to 1 year. Human immunodeficiency virus RNA, bacterial load by 16S RNA, herpesvirus (Epstein-Barr virus and cytomegalovirus [CMV]) shedding, and semen cytokines/chemokines were quantified, and semen T-cell subsets were assessed by multiparameter flow cytometry...
2017: Open Forum Infectious Diseases
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