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https://www.readbyqxmd.com/read/28239972/influence-of-mobile-phase-source-parameters-and-source-type-on-electrospray-ionization-efficiency-in-negative-ion-mode
#1
Anneli Kruve
Electrospray ionization (ESI) efficiency is known to be affected by the properties of the analytes, source design and source parameters. In this study, the ionization efficiency of 17 acidic compounds at various conditions in ESI negative ion mode was evaluated. Namely, the influence of organic solvent content in the mobile phase, ionization source parameters, ionization source geometry and functionality (conventional ESI, ESI with thermal focussing and with additional internal nebulizer gas) was studied. It was observed that the ionization efficiency in thermal focussing ESI is only marginally affected by the organic solvent composition, while for conventional ESI and ESI with internal nebulizer gas, the ionization efficiency increases significantly with increasing organic modifier content...
August 2016: Journal of Mass Spectrometry: JMS
https://www.readbyqxmd.com/read/28239970/atmospheric-pressure-chemical-ionization-of-explosives-induced-by-soft-x-radiation-in-ion-mobility-spectrometry-mass-spectrometric-investigation-of-the-ionization-reactions-of-drift-gasses-dopants-and-alkyl-nitrates
#2
Daniel Riebe, Alexander Erler, Thomas Ritschel, Toralf Beitz, Hans-Gerd Löhmannsröben, Andreas Beil, Michael Blaschke, Thomas Ludwig
A promising replacement for the radioactive sources commonly encountered in ion mobility spectrometers is a miniaturized, energy-efficient photoionization source that produce the reactant ions via soft X-radiation (2.8 keV). In order to successfully apply the photoionization source, it is imperative to know the spectrum of reactant ions and the subsequent ionization reactions leading to the detection of analytes. To that end, an ionization chamber based on the photoionization source that reproduces the ionization processes in the ion mobility spectrometer and facilitates efficient transfer of the product ions into a mass spectrometer was developed...
August 2016: Journal of Mass Spectrometry: JMS
https://www.readbyqxmd.com/read/28239608/elimination-of-dog-mediated-human-rabies-deaths-by-2030-needs-assessment-and-alternatives-for-progress-based-on-dog-vaccination
#3
Ryan M Wallace, Eduardo A Undurraga, Jesse D Blanton, Julie Cleaton, Richard Franka
BACKGROUND: Rabies imposes a substantial burden to about half of the world population. The World Health Organization (WHO), World Organization for Animal Health, and the Food and Agriculture Organization have set the goal of eliminating dog-mediated human rabies deaths by 2030. This could be achieved largely by massive administration of post-exposure prophylaxis-in perpetuity-, through elimination of dog rabies, or combining both. Here, we focused on the resources needed for the elimination of dog rabies virus by 2030...
2017: Frontiers in Veterinary Science
https://www.readbyqxmd.com/read/28239257/percutaneous-vertebroplasty-relieves-pain-in-cervical-spine-metastases
#4
Li Bao, Pu Jia, Jinjun Li, Hao Chen, Yipeng Dong, Fei Feng, He Yang, Mengmeng Chen, Hai Tang
Percutaneous vertebroplasty (PVP) has been shown to release spinal pain and stabilize the vertebral body. PVP is suggested as an alternative treatment in spinal metastasis. Although cervical metastases is less prevalent than thoracic and lumbar spine, PVP procedure in cervical vertebrae remains technical challenging. We retrospectively analyzed the data from patients (n = 9) who underwent PVP using anterolateral approach to treat severe neck pain and restricted cervical mobility from metastatic disease. Patients were rated using modified Tokuhashi score and Tomita score before the procedure...
2017: Pain Research & Management: the Journal of the Canadian Pain Society
https://www.readbyqxmd.com/read/28239146/transcending-the-slow-bimolecular-recombination-in-lead-halide-perovskites-for-electroluminescence
#5
Guichuan Xing, Bo Wu, Xiangyang Wu, Mingjie Li, Bin Du, Qi Wei, Jia Guo, Edwin K L Yeow, Tze Chien Sum, Wei Huang
The slow bimolecular recombination that drives three-dimensional lead-halide perovskites' outstanding photovoltaic performance is conversely a fundamental limitation for electroluminescence. Under electroluminescence working conditions with typical charge densities lower than 10(15) cm(-3), defect-states trapping in three-dimensional perovskites competes effectively with the bimolecular radiative recombination. Herein, we overcome this limitation using van-der-Waals-coupled Ruddlesden-Popper perovskite multi-quantum-wells...
February 27, 2017: Nature Communications
https://www.readbyqxmd.com/read/28239018/rural-african-americans-perspectives-on-mental-health-comparing-focus-groups-and-deliberative-democracy-forums
#6
Greer Sullivan, Ann Cheney, Mary Olson, Tiffany Haynes, Keneshia Bryant, Naomi Cottoms, Christina Reaves, Geoff Curran
A number of approaches have been used to obtain community members' health perspectives. Health services researchers often conduct focus groups while political scientists and community groups may hold forums. To compare and contrast these two approaches, we conducted six focus groups (n = 50) and seven deliberative democracy forums (n = 233) to obtain the perspectives of rural African Americans on mental health problems in their community. Inductive qualitative analysis found three common themes: rural African Americans (1) understood stresses of poverty and racism were directly related to mental health, (2) were concerned about widespread mental illness stigma, and (3) thought community members could not identify mental health problems requiring treatment...
2017: Journal of Health Care for the Poor and Underserved
https://www.readbyqxmd.com/read/28238915/a-simply-prepared-small-diameter-artificial-blood-vessel-that-promotes-in-situ-endothelialization
#7
Hong-Feng Guo, Wei-Wei Dai, De-Hui Qian, Zhe-Xue Qin, Yan Lei, Xiao-Yu Hou, Can Wen
Synthetic grafts are of limited use in small-diameter vessels (Φ < 6 mm) due to the poor patency rate. The inability of such grafts to achieve early endothelialization together with the compliance mismatch between the grafts and the native vessels promote thrombosis, which eventually leads to graft occlusion. In the current study, stromal cell-derived factor (SDF)-1α/vascular endothelial growth factor (VEGF)-loaded polyurethane (PU) conduits were simply prepared via electrospinning. The mechanical property, drug release behavior and cytocompatibility of the conduits were investigated...
February 23, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28238894/a-narrative-review-of-social-media-and-game-based-nutrition-interventions-targeted-at-young-adults
#8
Monica Nour, Sin Hang Yeung, Stephanie Partridge, Margaret Allman-Farinelli
The increased popularity of social media and mobile gaming among young adults provides an opportunity for innovative nutrition programs. This review evaluated the efficacy of these strategies in interventions targeted at 18- to 35-year-olds. The protocol was guided by the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA). Ten scientific databases, information technology conference proceedings, and gray literature were searched. Two reviewers conducted screening, data extraction, and quality assessments...
February 23, 2017: Journal of the Academy of Nutrition and Dietetics
https://www.readbyqxmd.com/read/28238776/the-effect-of-cell-phone-use-on-postural-balance-and-mobility-in-older-compared-to-young-adults
#9
Rabeb Laatar, Hiba Kachouri, Rihab Borji, Haithem Rebai, Sonia Sahli
Cell phone use is considered as an essential part of everyday life saturating all age groups and demographics. This study aimed to explore the effect of various cell phone functions on postural control and mobility in the elderly. Twenty healthy older (mean age 72.5±2.9) and twenty young (26.3±2.8) adults participated in this study. Postural balance was assessed by measuring the center of pressure (CoP) displacement with (talking on a cell phone (CONVERSE), dialing a number (DIAL) and listening to music (MUSIC)) and without cell phone use...
February 23, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28238733/fragmentation-of-the-crispr-cas-type-i-b-signature-protein-cas8b
#10
Hagen Richter, Judith Rompf, Julia Wiegel, Kristina Rau, Lennart Randau
BACKGROUND: CRISPR arrays are transcribed into long precursor RNA species, which are further processed into mature CRISPR RNAs (crRNAs). Cas proteins utilize these crRNAs, which contain spacer sequences that can be derived from mobile genetic elements, to mediate immunity during a reoccurring virus infection. Type I CRISPR-Cas systems are defined by the presence of different Cascade interference complexes containing large and small subunits that play major roles during target DNA selection...
February 23, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28238654/prmt5-dependent-methylation-of-the-tip60-coactivator-ruvbl1-is-a-key-regulator-of-homologous-recombination
#11
Thomas L Clarke, Maria Pilar Sanchez-Bailon, Kelly Chiang, John J Reynolds, Joaquin Herrero-Ruiz, Tiago M Bandeiras, Pedro M Matias, Sarah L Maslen, J Mark Skehel, Grant S Stewart, Clare C Davies
Protein post-translation modification plays an important role in regulating DNA repair; however, the role of arginine methylation in this process is poorly understood. Here we identify the arginine methyltransferase PRMT5 as a key regulator of homologous recombination (HR)-mediated double-strand break (DSB) repair, which is mediated through its ability to methylate RUVBL1, a cofactor of the TIP60 complex. We show that PRMT5 targets RUVBL1 for methylation at position R205, which facilitates TIP60-dependent mobilization of 53BP1 from DNA breaks, promoting HR...
February 21, 2017: Molecular Cell
https://www.readbyqxmd.com/read/28238264/the-influence-of-aqueous-inorganic-anions-on-the-reactivity-of-nanoparticles-in-tio2-photocatalysis
#12
Jeffrey Farner Budarz, Andrea Turolla, Aleksander F Piasecki, Jean-Yves Bottero, Manuela Antonelli, Mark R Wiesner
The influence of inorganic anions on the photoreactivity and aggregation of titanium dioxide nanoparticles (NPs) was assessed by dosing carbonate, chloride, nitrate, phosphate and sulfate as potassium salts at multiple concentrations. Nanoparticle stability was monitored in terms of aggregate morphology and electrophoretic mobility (EPM). Aggregates size and fractal dimension were measured over time by laser diffraction, and the isoelectric point (IEP) as a function of anion and concentration was obtained by measuring EPM vs...
February 27, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28238169/flow-and-quiet-eye-the-role-of-attentional-control-in-flow-experience
#13
David J Harris, Samuel J Vine, Mark R Wilson
This report was designed to investigate the role of effective attention control in flow states, by developing an experimental approach to the study of flow. A challenge-skill balance manipulation was applied to self-paced netball and basketball shooting tasks, with point of gaze recorded through mobile eye tracking. Quiet eye was used to index optimal control of visual attention. While the experimental manipulation was found to have no effect, quiet eye was associated with the experience of flow. Furthermore, mediation revealed an indirect effect of quiet eye on performance through flow experience...
February 25, 2017: Cognitive Processing
https://www.readbyqxmd.com/read/28237958/study-protocol-for-a-pragmatic-randomised-controlled-trial-evaluating-efficacy-of-a-smoking-cessation-e-tabac-info-service-ee-tis-trial
#14
L Cambon, P Bergman, Al Le Faou, I Vincent, B Le Maitre, A Pasquereau, P Arwidson, D Thomas, F Alla
INTRODUCTION: A French national smoking cessation service, Tabac Info Service, has been developed to provide an adapted quitline and a web and mobile application involving personalised contacts (eg, questionnaires, advice, activities, messages) to support smoking cessation. This paper presents the study protocol of the evaluation of the application (e-intervention Tabac Info Service (e-TIS)). The primary objective is to assess the efficacy of e-TIS. The secondary objectives are to (1) describe efficacy variations with regard to users' characteristics, (2) analyse mechanisms and contextual conditions of e-TIS efficacy...
February 24, 2017: BMJ Open
https://www.readbyqxmd.com/read/28237938/game-theoretic-analysis-of-cooperative-message-forwarding-in-opportunistic-mobile-networks
#15
Sujata Pal, Barun Kumar Saha, Sudip Misra
In cooperative communication, a set of players forming a coalition ensures communal behavior among themselves by helping one another in message forwarding. Opportunistic mobile networks (OMNs) require multihop communications for transferring messages from the source to the destination nodes. However, noncooperative nodes only forward their own messages to others, and drop others' messages upon receiving them. So, the message delivery overhead increases in OMN. For minimizing the overhead and maximizing the delivery rate, we propose two coalition-based cooperative schemes: 1) simple coalition formation (SCF) and 2) overlapping coalition formation (OCF) game...
February 21, 2017: IEEE Transactions on Cybernetics
https://www.readbyqxmd.com/read/28237917/detection-of-motor-impairment-in-parkinson-s-disease-via-mobile-touchscreen-typing
#16
Teresa Arroyo-Gallego, Maria Jesus Ledesma-Carbayo, Alvaro Sanchez-Ferro, Ian Butterworth, Carlos Sanchez-Mendoza, Michele Matarazzo, Paloma Montero, Roberto Lopez-Blanco, Veronica Puertas-Martin, Rocio Trincado, Luca Giancardo
Mobile technology is opening a wide range of opportunities for transforming the standard of care for chronic disorders. Using smartphones as tools for longitudinally tracking symptoms could enable personalization of drug regimens and improve patient monitoring. Parkinson's disease (PD) is an ideal candidate for these tools. At present, evaluation of PD signs requires trained experts to quantify motor impairment in the clinic, limiting the frequency and quality of the information available for understanding the status and progression of the disease...
February 20, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28237842/can-an-educational-application-increase-risk-perception-accuracy-amongst-patients-attending-a-high-risk-breast-cancer-clinic
#17
D Keohane, E Lehane, E Rutherford, V Livingstone, L Kelly, S Kaimkhani, F O'Connell, H P Redmond, M A Corrigan
OBJECTIVES: To design, develop and test the effect of an educational initiative to improve risk perception amongst patients attending a high-risk breast cancer clinic. This was achieved through three objectives - 1. identifying an optimal method of presenting risk data, 2. designing and building a risk application, and 3. testing the ability of the application to successfully modify patients perceived risk of cancer. MATERIALS AND METHODS: A mobile application was developed for this project using best practice methods for displaying risk information...
February 23, 2017: Breast: Official Journal of the European Society of Mastology
https://www.readbyqxmd.com/read/28237649/protein-kinase-ck2%C3%AE-catalytic-subunit-ameliorates-diabetic-renal-inflammatory-fibrosis-via-nf-%C3%AE%C2%BAb-signaling-pathway
#18
Junying Huang, Zhiquan Chen, Jie Li, Qiuhong Chen, Jingyan Li, Wenyan Gong, Jiani Huang, Peiqing Liu, Heqing Huang
Activation of casein kinase 2 (CK2) is closely linked to the body disturbance of carbohydrate metabolism and inflammatory reaction. The renal chronic inflammatory reaction in the setting of diabetes is one of the important hallmarks of diabetic renal fibrosis. However, it remains unknown whether CK2 influences the process of diabetic renal fibrosis. The current study is aimed to investigate if CK2α ameliorates renal inflammatory fibrosis in diabetes via NF-κB pathway. To explore potential regulatory mechanism of CK2α, the expression and activity of CK2α, which were studied by plasmid transfection, selective inhibitor, small-interfering RNA (siRNA) and adenovirus infection in vitro or in vivo, were analyzed by means of western blotting (WB), dual luciferase reporter assay and electrophoretic mobility shift assay (EMSA)...
February 22, 2017: Biochemical Pharmacology
https://www.readbyqxmd.com/read/28237617/safe-dissection-of-high-paraaortic-lymph-nodes-superior-to-the-renal-vein-in-ovarian-primary-peritoneal-or-fallopian-tube-cancer-by-the-komiyama-s-maneuver-a-modification-of-kocher-s-maneuver
#19
Shinichi Komiyama, Megumi Manrai, Rena Takahashi, Chiaki Takeya
OBJECTIVE: High paraaortic lymph nodes superior to the renal vein are often involved by metastasis from advanced ovarian cancer, but are difficult to dissect. We developed a novel surgical technique for removing these nodes. METHODS: The ascending colon is displaced from the right paracolic gutter. A retroperitoneal incision is made cranially from the ileocecal region along Monk's white line (fusion fascia) dorsal to the ascending colon. Incising the fusion fascia toward the root of the right renal vein from inside Gerota's fascia allows separation of the right kidney and mobilization of the ascending colon, partly exposing the inferior vena cava...
February 22, 2017: Gynecologic Oncology
https://www.readbyqxmd.com/read/28237604/resistance-training-performed-at-distinct-angular-velocities-elicits-velocity-specific-alterations-in-muscle-strength-and-mobility-status-in-older-adults
#20
Davis A Englund, Rick L Sharp, Joshua T Selsby, Shanthi S Ganesan, Warren D Franke
BACKGROUND: The purpose of this study was to compare the effects of high and low velocity knee extension training on changes in muscle strength and mobility status in high-functioning older adults. METHODS: Twenty-six (16 female, 10 male) older adults (mean age of 65) were randomized to either 6weeks of low velocity resistance training (LVRT) performed at 75°/s or high velocity resistance training (HVRT) performed at 240°/s. Both groups performed 3 sets of knee extension exercises at maximal effort, 3 times a week...
February 22, 2017: Experimental Gerontology
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