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https://www.readbyqxmd.com/read/29793127/effects-of-sodium-salicylate-on-the-determination-of-lead-210-bismuth-210-by-cerenkov-counting
#1
Yadong Wang, Yonggang Yang, Lijuan Song, Yan Ma, Maoyi Luo, Xiongxin Dai
Due to the nature of Cerenkov radiation and instrumental limitations, detection efficiencies of 210 Bi by Cerenkov counting are generally quite low (~15%). Sodium salicylate, acting as a wavelength shifter, has been used to improve the detection efficiency of Cerenkov photons. In this study, we found that the addition of sodium salicylate could significantly increase the counting efficiencies of 210 Pb/210 Bi in aqueous samples. Meanwhile, a sharp increase of the counting efficiency for the alphas from 210 Po was also observed with the addition of high concentration of sodium salicylate, implying that scintillation light rather than Cerenkov photons from the alphas has been produced...
May 21, 2018: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/29792293/recruitment-and-participation-of-recreational-runners-in-a-large-epidemiological-and-genetic-research-study-retrospective-data-analysis
#2
Silvia Manzanero, Maria Kozlovskaia, Nicole Vlahovich, David C Hughes
BACKGROUND: With the increasing capacity for remote collection of both data and samples for medical research, a thorough assessment is needed to determine the association of population characteristics and recruitment methodologies with response rates. OBJECTIVE: The aim of this research was to assess population representativeness in a two-stage study of health and injury in recreational runners, which consisted of an epidemiological arm and genetic analysis. METHODS: The cost and success of various classical and internet-based methods were analyzed, and demographic representativeness was assessed for recruitment to the epidemiological survey, reported willingness to participate in the genetic arm of the study, actual participation, sample return, and approval for biobank storage...
May 23, 2018: JMIR Research Protocols
https://www.readbyqxmd.com/read/29792238/mapping-the-neuroanatomic-substrates-of-cognition-in-familial-attention-deficit-hyperactivity-disorder
#3
Rachel Muster, Saadia Choudhury, Wendy Sharp, Steven Kasparek, Gustavo Sudre, Philip Shaw
BACKGROUND: While the neuroanatomic substrates of symptoms of attention deficit hyperactivity disorder (ADHD) have been investigated, less is known about the neuroanatomic correlates of cognitive abilities pertinent to the disorder, particularly in adults. Here we define the neuroanatomic correlates of key cognitive abilities and determine if there are associations with histories of psychostimulant medication. METHODS: We acquired neuroanatomic magnetic resonance imaging data from 264 members of 60 families (mean age 29...
May 24, 2018: Psychological Medicine
https://www.readbyqxmd.com/read/29791800/tip-enhanced-raman-scattering-from-nano-patterned-graphene-and-graphene-oxide
#4
Ashish Bhattarai, Andrey Krayev, Alexey Temiryazev, Dmitry Evplov, Kevin Thomas Crampton, Wayne P Hess, Patrick Z El Khoury
Tip-enhanced Raman spectroscopy (TERS) is particularly sensitive to analytes residing at plasmonic tip-sample nanojunctions, where the incident and scattered optical fields may be localized and optimally enhanced. However, the enhanced local electric fields in this so-called gap-mode TERS configuration are nominally orthogonal to the sample plane. As such, any given Raman active vibrational Eigenstate needs to have projections (of its polarizability derivative tensor elements) along the sample normal to be detectable via TERS...
May 23, 2018: Nano Letters
https://www.readbyqxmd.com/read/29791712/surgical-management-after-hysteroscopic-sterilization-minimally-invasive-approach-incorporating-intraoperative-fluoroscopy-for-symptomatic-patients-with-2-essure%C3%A2-devices
#5
E Scott Sills, Natalie S Rickers, Xiang Li
OBJECTIVE: To describe a non-hysterectomy surgical technique for symptomatic patients with >2 Essure® (Bayer Healthcare, Whippany, New Jersey) devices. DESIGN: Patients (n=4) presented with sharp pelvic pain, irregular vaginal bleeding, dyspareunia, weight gain, hair loss, fatigue, and/or diffuse skin rash, all of which were absent before undergoing hysteroscopic sterilization (HS). Hysterosalpingogram obtained before surgical excision of contraceptive tubal implants confirmed more than two Essure® devices in all patients...
June 1, 2018: Surgical Technology International
https://www.readbyqxmd.com/read/29791195/psychometric-evaluation-of-the-inventory-of-interpersonal-problems-32
#6
Cassandra Bailey, Anna Abate, Carla Sharp, Amanda Venta
The Inventory of Interpersonal Problems 32 (IIP-32; Horowitz, Aiden, Wiggins, & Pincus, 2000) is a brief, 32-item, self-report questionnaire used to screen for interpersonal problems. While studies of the IIP-32's psychometric properties have been conducted in other nations, and studies have examined the psychometric properties of the IIP-32's circumplex structure, no studies have examined the factor-analytic structure in the United States since the original standardization sample. The aim of this study was to examine the psychometric properties of the IIP-32 in American college women for the first time and explore its structural validity as a circumplex measure and its concurrent validity with measures of attachment...
2018: Bulletin of the Menninger Clinic
https://www.readbyqxmd.com/read/29791192/perceived-pubertal-timing-and-borderline-personality-pathology-in-female-adolescent-inpatients
#7
Francesca Penner, Carla Sharp
Borderline personality pathology typically onsets during adolescence. An important consideration in understanding adolescent psychopathology is pubertal development. Perceived pubertal timing is one facet of puberty that is especially relevant to adolescent psychopathology, especially when timing is perceived to be early. Despite links between early pubertal timing and core features of borderline personality disorder, and between early pubertal timing and disruptions in the interpersonal context, perceived pubertal timing has yet to be studied in relation to adolescent borderline pathology...
2018: Bulletin of the Menninger Clinic
https://www.readbyqxmd.com/read/29791042/behavioral-state-specific-neurons-in-the-mouse-medulla-involved-in-sleep-wake-switching
#8
K Sakai
The medullary reticular formation (RF) is involved in the maintenance of several vital physiological functions and level of vigilance. In the present study in non-anesthetized, head-fixed mice, I examined the role of medullary RF neurons in the control of sleep-wake states, i.e. wakefulness (W), slow-wave sleep (SWS), and paradoxical (or rapid eye movement) sleep (PS). I showed, for the first time, that the mouse medullary RF contains presumed SWS-promoting, SWS-on neurons that remain silent during W, display a sharp increase in discharge rate at sleep onset, and discharge tonically and selectively during SWS...
May 23, 2018: European Journal of Neuroscience
https://www.readbyqxmd.com/read/29790858/focused-electron-beam-induced-deposition-for-fabrication-of-highly-durable-and-sensitive-metallic-afm-ir-probes
#9
Wen Qian, Shuo Sun, Jingfeng Song, Charles Nguyen, Steven Ducharme, Joseph A Turner
We report on the fabrication of metallic, ultra-sharp atomic force microscope (AFM) tips for localized nanoscale infrared (IR) spectrum measurements by using focused electron-beam-induced deposition of platinum (Pt) or tungsten (W). The tip length can be controlled by changing the duration time of the electron beam. Probes of 12.0 ± 5.0 nm radius-of-curvature can be routinely produced with high repeatability and near-100% yield. The near-field-enhancement appears stronger at the extremity of the metallic tip, compared with commercial pristine silicon nitride (SiN) probe tip...
May 23, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29790333/autonomous-scanning-probe-microscopy-in-situ-tip-conditioning-through-machine-learning
#10
Mohammad Rashidi, Robert A Wolkow
Atomic-scale characterization and manipulation with scanning probe microscopy rely upon the use of an atomically sharp probe. Here we present automated methods based on machine learning to automatically detect and recondition the quality of the probe of a scanning tunneling microscope. As a model system, we employ these techniques on the technologically relevant hydrogen-terminated silicon surface, training the network to recognize abnormalities in the appearance of surface dangling bonds. Of the machine learning methods tested, a convolutional neural network yielded the greatest accuracy, achieving a positive identification of degraded tips in 97% of the test cases...
May 23, 2018: ACS Nano
https://www.readbyqxmd.com/read/29790222/monitoring-the-hydrothermal-growth-of-cobalt-spinel-water-oxidation-catalysts-from-preparative-history-to-catalytic-activity
#11
Lukas Reith, Karla Lienau, Daniel S Cook, René Moré, Richard I Walton, Greta Ricarda Patzke
The hydrothermal growth of cobalt oxide spinel (Co₃O₄) nanocrystals from cobalt acetate precursors was monitored with in situ powder X-ray diffraction (PXRD) in combination with ex situ electron microscopy and vibrational spectroscopy. Kinetic data from in situ PXRD monitoring were analyzed using Sharp-Hancock and Gualtieri approaches, which both clearly indicate a change of the growth mechanism for reaction temperatures above 185°C. This mechanistic transition goes hand in hand with morphology changes that notably influence the photocatalytic oxygen evolution activity...
May 23, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29789818/the-effect-of-hydration-on-the-electronic-structure-and-stability-of-the-superalkali-cation-li-3
#12
Jia-Huan Hou, Di Wu, Jia-Yuan Liu, Si-Yi Li, Dan Yu, Ying Li
The interaction of the superalkali cation Li3+ with water molecules, as well as the structures and stability of the resulting water complexes are theoretically studied at the MP2/6-311++G(d,p) level. A great number of geometrical configurations were obtained for the Li3+(H2O)n (n = 1-5) complexes and Li3+ is found to have a maximum coordination number of four. Natural population analysis shows that the charge distribution of Li3+ becomes seriously uneven upon interaction with five water molecules, so it loses ring conjugation and splits in the lowest-energy isomer of Li3+(H2O)5...
May 23, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29789362/reply-to-forni-et-al-multiple-selected-changes-may-modulate-the-molecular-interaction-between-laverania-rh5-and-primate-basigin
#13
Lindsey J Plenderleith, Weimin Liu, Oscar A MacLean, Yingying Li, Dorothy E Loy, Sesh A Sundararaman, Frederic Bibollet-Ruche, Gerald H Learn, Beatrice H Hahn, Paul M Sharp
No abstract text is available yet for this article.
May 22, 2018: MBio
https://www.readbyqxmd.com/read/29789302/fractional-flow-reserve-and-instantaneous-wave-free-ratio-as-predictors-of-the-placebo-controlled-response-to-percutaneous-coronary-intervention-in-stable-single-vessel-coronary-artery-disease-physiology-stratified-analysis-of-orbita
#14
Rasha Al-Lamee, James P Howard, Matthew J Shun-Shin, David Thompson, Hakim-Moulay Dehbi, Sayan Sen, Sukhjinder Nijjer, Ricardo Petraco, John Davies, Thomas Keeble, Kare Tang, Iqbal S Malik, Christopher Cook, Yousif Ahmad, Andrew S P Sharp, Robert Gerber, Christopher Baker, Raffi Kaprielian, Suneel Talwar, Ravi Assomull, Graham Cole, Niall G Keenan, Gajen Kanaganayagam, Joban Sehmi, Roland Wensel, Frank E Harrell, Jamil Mayet, Simon A Thom, Justin E Davies, Darrel P Francis
BACKGROUND : There are no data on how fractional flow reserve (FFR) and instantaneous wave-free ratio (iFR) are associated with the placebo-controlled efficacy of percutaneous coronary intervention (PCI) in stable single-vessel coronary artery disease. METHODS : We report the association between prerandomization invasive physiology within ORBITA (Objective Randomised Blinded Investigation With Optimal Medical Therapy of Angioplasty in Stable Angina), a placebo-controlled trial of patients who have stable angina with angiographically severe single-vessel coronary disease clinically eligible for PCI...
May 22, 2018: Circulation
https://www.readbyqxmd.com/read/29788936/association-between-stress-fracture-incidence-and-predicted-body-fat-in-united-states-army-basic-combat-training-recruits
#15
Joseph J Knapik, Marilyn A Sharp, Scott J Montain
BACKGROUND: A stress fracture (SF) is a highly debilitating injury commonly experienced in United States Army Basic Combat Training (BCT). Body fat (BF) may be associated with this injury but previous investigations (in athletes) have largely used SF self-reports and lacked sufficient statistical power. This investigation developed an equation to estimate %BF and used that equation to examine the relationship between %BF and SF risk in BCT recruits. METHODS: Data for the %BF predictive equation involved 349 recruits with BF obtained from dual-energy X-ray absorptiometry...
May 22, 2018: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/29788820/injury-and-infection-in-dental-clinics-risk-factors-and-prevention
#16
Mustafa Al-Zoughool, Zaina Al-Shehri
Needlestick and sharp instrument injuries are common in dental practice and present the risk of direct exposure to blood-borne pathogens, including hepatitis B virus. This cross-sectional study was carried out to determine the risk factors of injury and infection in three types of dental clinic in Riyadh, Saudi Arabia. A total of 274 male and 241 female dentists completed a structured questionnaire on demographic factors, compliance with infection control practices, and past exposure to injury and infection hazards...
January 1, 2018: Toxicology and Industrial Health
https://www.readbyqxmd.com/read/29788790/eeg-differences-in-two-clinically-similar-rapid-dementias-voltage-gated-potassium-channel-complex-associated-autoimmune-encephalitis-and-creutzfeldt-jakob-disease
#17
Brin Freund, John C Probasco, Mackenzie C Cervenka, Raoul Sutter, Peter W Kaplan
Distinguishing treatable causes for rapidly progressive dementia from those that are incurable is vital. Creutzfeldt-Jakob disease (CJD) and voltage-gated potassium channel complex-associated autoimmune encephalitis (VGKC AE) are 2 such conditions with disparate outcomes and response to treatment. To determine the differences in electroencephalography between CJD and VGKC AE, we performed a retrospective review of medical records and examined clinical data, neuroimaging, and electroencephalographs performed in patients admitted for evaluation for rapidly progressive dementia diagnosed with CJD and VGKC AE at the Johns Hopkins Hospital and Bayview Medical Center between January 1, 2007 and December 31, 2015...
May 1, 2018: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/29788503/visual-analogue-scales-for-interstitial-lung-disease-a-prospective-validation-study
#18
Helen Yates, Huzaifa I Adamali, Nick Maskell, Shaney Barratt, Charles Sharp
Rationale: Visual analogue scales (VAS) are simple symptom assessment tools which have not been validated in interstitial lung disease (ILD). Simple measures of ILD disease burden would be valuable for non-specialist clinicians monitoring disease away from ILD specialist centres. Objective: To validate VAS to assess change in dyspnoea, cough and fatigue in ILD, and to define the minimal clinically important difference (MCID) for change in these. Methods: 64 patients with ILD completed VAS for dyspnoea, cough and fatigue...
May 16, 2018: QJM: Monthly Journal of the Association of Physicians
https://www.readbyqxmd.com/read/29787997/depth-based-whole-body-photoplethysmography-in-remote-pulmonary-function-testing
#19
Vahid Soleimani, Majid Mirmehdi, Dima Damen, Massimo Camplani, Sion Hannuna, Charles Sharp, James Dodd
OBJECTIVE: We propose a novel depth-based photoplethysmography (dPPG) approach to reduce motion artifacts in respiratory volume-time data and improve the accuracy of remote pulmonary function testing (PFT) measures. METHOD: Following spatial and temporal calibration of two opposing RGB-D sensors, a dynamic three-dimensional model of the subject performing PFT is reconstructed and used to decouple trunk movements from respiratory motions. Depth-based volume-time data is then retrieved, calibrated, and used to compute 11 clinical PFT measures for forced vital capacity and slow vital capacity spirometry tests...
June 2018: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/29787381/multi-atlas-based-segmentation-should-we-prefer-the-best-atlas-group-over-the-group-of-best-atlases
#20
Paolo Zaffino, Delia Ciardo, Patrik Raudaschl, Karl Fritscher, Rosalinda Ricotti, Daniela Alterio, Giulia Marvaso, Cristiana Fodor, Guido Baroni, Francesco Amato, Roberto Orecchia, Barbara Alicja Jereczek-Fossa, Gregory C Sharp, Maria Francesca Spadea
Multi Atlas Based Segmentation (MABS) uses a database of atlas images, and an atlas selection process is used to choose an atlas subset for registration and voting. In the current state of the art, atlases are chosen according to a similarity criterion between the target subject and each atlas in the database. In this paper, we propose a new concept for atlas selection that relies on selecting the best performing group of atlases rather than the group of highest scoring individual atlases.
 Experiments were performed using CT images of 50 patients, with contours of brainstem and parotid glands...
May 22, 2018: Physics in Medicine and Biology
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