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https://www.readbyqxmd.com/read/28813621/improvement-of-an-in-vitro-model-to-assess-delivered-dose-and-particle-size-for-a-vibrating-mesh-nebulizer-during-mechanical-ventilation
#1
Nani Kadrichu, Derek Daniher
BACKGROUND: In an in vitro model of mechanical ventilation with gravity-dependent filter position we observed artificially high delivered doses resulting from liquid droplet collection and precipitation of aerosolized drug. We sequentially modified the model to obtain accurate reproducible measurements of delivered dose and particle size at endotracheal tube exit. METHODS: Stepwise changes in the model included (1) altering the endotracheal tube position to a gravity-independent position, (2) adding fluid traps, (3) humidifying air near the test lung, and (4) simplifying test lung and filters...
August 16, 2017: Journal of Aerosol Medicine and Pulmonary Drug Delivery
https://www.readbyqxmd.com/read/28813383/the-brilliance-trap
#2
Andrei Cimpian, Sarah-Jane Leslie
No abstract text is available yet for this article.
August 15, 2017: Scientific American
https://www.readbyqxmd.com/read/28813156/the-spatial-resolution-limit-for-individual-domain-wall-in-magnetic-nanowires
#3
Sumit Dutta, Saima Afroz Siddiqui, Jean Anne Currivan-Incorvia, Caroline A Ross, Marc A Baldo
Magnetic nanowires are the foundation of several promising nonvolatile computing devices, most notably magnetic racetrack memory and domain wall logic. Here, we determine the analog information capacity in these technologies, analyzing a magnetic nanowire containing a single domain wall. Although wires can be deliberately patterned with notches to define discrete positions for domain walls, the line edge roughness of the wire can also trap domain walls at dimensions below the resolution of the fabrication process, determining the fundamental resolution limit for the placement of a domain wall...
August 16, 2017: Nano Letters
https://www.readbyqxmd.com/read/28813055/multivesicular-droplets-a-cell-model-system-to-study-compartmentalised-biochemical-reactions
#4
N Nuti, P E Verboket, P S Dittrich
Multivesicular vesicles (MVVs) are artificial liposomal structures widely used as a platform to study the compartmentalisation of cells and as a scaffold for artificial cell/protocell models. Current preparation techniques for MVVs, however, offer poor control on the size, lamellarity, and loading of inner lipid vesicles. Here, we introduce a microfluidic device for the production of multivesicular droplets (MVDs): a novel model system combining the ease of use and control of droplet microfluidics with the biological relevance of MVVs...
August 16, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28812879/germanium-and-tin-monoxides-trapped-by-oxophilic-germylene-and-stannylene-ligands
#5
Yunxia Gao, Ying Yang, Wenjun Zheng, Yuanyuan Su, Xiang Zhang, Herbert W Roesky
Germanium and tin monoxides (MO, M = Ge, Sn) were trapped by the 1,2,4-diazaphospholide-based germylene and stannylene M[3,5-tBu2dp]2 (M = Ge (2), Sn (3)), resulting in the Lewis acid-base adduct of composition M(μ-O)[M{η(1)(N)-(3,5-tBu2dp)}2]2 (M = Ge (4), Sn (5)). Compounds 4 and 5 were characterized by single-crystal X-ray structural analysis. The bonding features of 4 and 5 were supported by DFT calculations.
August 16, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28812866/directly-coating-multifunctional-interlayer-on-the-cathode-via-electrospinning-for-advanced-lithium-sulfur-batteries
#6
Yueying Peng, Yiyong Zhang, Yunhui Wang, Xiu Shen, Feng Wang, He Li, Bing-Joe Hwang, Jinbao Zhao
Lithium sulfur battery is considered as a prospective candidate for high-energy-storage system as its high theoretical specific capacity and energy. However, the dissolution and shutter of polysulfides lead to low active material utilization and fast capacity fading. Electrospinning technology is employed to directly coat an interlayer composed of polyacrylonitrile (PAN) and nitrogen-doped carbon black (NC) fibers on the cathode. Benefited from electrospinning technology, the PAN-NC fibers possess good electrolyte infiltration for fast lithium-ion transport and great flexibility for adhering on the cathode...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28812082/a-broader-view-on-ion-heating-in-traveling-wave-devices-using-fragmentation-of-csi-clusters-and-extent-of-h%C3%AB-migration-as-molecular-thermometers
#7
Frederik Lermyte, Frank Sobott
Electron transfer dissociation (ETD) is becoming increasingly important in mass spectrometry-based analysis of peptides and proteins. Supplemental collisional activation of undissociated electron transfer products can significantly increase fragmentation yield and sequence coverage, but hydrogen rearrangements - specifically, transfer of a hydrogen radical from a c to a z fragment - lead to distorted isotope distributions and increased potential for signal overlap. Concomitant collisional activation during the ion/ion reaction significantly reduces these rearrangements, but, in ion traps, also leads to lower reaction rates and reduced overlap of anion and cation clouds...
August 16, 2017: Analyst
https://www.readbyqxmd.com/read/28812057/screening-for-syphilis-in-cases-of-suspected-gonorrhea-and-chlamydia-infections
#8
Kumara V Nibhanipudi, Kenneth Cody
Background. In all cases of suspected sexually transmitted infections (STIs), it has been routine practice to screen for syphilis with a blood sample. The incidence of syphilis seems to be lower than that of commonly screened STIs. Objective. The objective of our study was to determine whether it is cost-effective to screen for syphilis with serological testing in cases of suspected gonorrhea and chlamydia infections. Hypothesis. Our hypothesis is that it is not cost-effective to screen for syphilis in cases of presumed gonorrhea and chlamydia infections...
2017: Global Pediatric Health
https://www.readbyqxmd.com/read/28811780/role-of-vitamin-d-in-reducing-number-of-acute-exacerbations-in-chronic-obstructive-pulmonary-disease-copd-patients
#9
Dur Muhammad Khan, Aziz Ullah, Fawad Ahmad Randhawa, Somia Iqtadar, Nasir Farooq Butt, Khadija Waheed
BACKGROUND AND OBJECTIVE: Chronic obstructive pulmonary disease (COPD) is characterized by chronic incompletely reversible poor airflow and air trapping and usually this debilitating disorder limits the outside activities of the patients depriving them of sunlight which is a rich source of Vitamin D. The objective of this study was to determine the effect of vitamin D supplementation in reducing number of acute exacerbation in COPD patients. METHODS: This randomized control trial was conducted at East Medical Ward Mayo Hospital Lahore from January to December 2015 as exacerbations of COPD are season dependent...
May 2017: Pakistan Journal of Medical Sciences Quarterly
https://www.readbyqxmd.com/read/28811621/morphological-differences-of-the-reproductive-system-could-be-used-to-predict-the-optimum-grapholita-molesta-busck-control-period
#10
Zhiwei Zhang, Lina Men, Yunfei Peng, Jun Li, Angie Deng, Yuan Chen, Xianqian Liu, Ruiyan Ma
The oriental fruit moth (OFM), Grapholita molesta (Busck), is one of the dominant fruit-boring pests worldwide. In order to conduct integrated control of OFM effectively, it is important to predict the optimum control period. OFM populations have been monitored either by the number of trapped male moths exposed to sex pheromones or by the number of trapped male and female moths using food traps in orchards. The mating status and development stage of the trapped moths have not been characterized. The present paper studies the anatomical morphology of the OFM reproductive system at different development periods...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28811497/vertical-ocean-heat-redistribution-sustaining-sea-ice-concentration-trends-in-the-ross-sea
#11
Olivier Lecomte, Hugues Goosse, Thierry Fichefet, Casimir de Lavergne, Antoine Barthélemy, Violette Zunz
Several processes have been hypothesized to explain the slight overall expansion of Antarctic sea ice over the satellite observation era, including externally forced changes in local winds or in the Southern Ocean's hydrological cycle, as well as internal climate variability. Here, we show the critical influence of an ocean-sea-ice feedback. Once initiated by an external perturbation, it may be sufficient to sustain the observed sea-ice expansion in the Ross Sea, the region with the largest and most significant expansion...
August 15, 2017: Nature Communications
https://www.readbyqxmd.com/read/28811475/microsecond-pulse-i-v-approach-to-understanding-defects-in-high-mobility-bi-layer-oxide-semiconductor-transistor
#12
Hyunsuk Woo, Sanghun Jeon
The carrier transport and device instability of amorphous oxide semiconductor devices are influenced by defects that are exponentially distributed in energy, because of amorphous phase channels and front/back interfaces with a large number of sub-gap states. Thus, understanding defects and charge trapping in oxide semiconductor transistors is required for being core device element in reliable production lines. In this paper, we present the transient charging effect, the charge trapping mechanism, and the dynamic charge transport of high-mobility bilayer oxide semiconductor transistors...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28811364/mechanosensing-drives-acuity-of-%C3%AE-%C3%AE-t-cell-recognition
#13
Yinnian Feng, Kristine N Brazin, Eiji Kobayashi, Robert J Mallis, Ellis L Reinherz, Matthew J Lang
T lymphocytes use surface [Formula: see text] T-cell receptors (TCRs) to recognize peptides bound to MHC molecules (pMHCs) on antigen-presenting cells (APCs). How the exquisite specificity of high-avidity T cells is achieved is unknown but essential, given the paucity of foreign pMHC ligands relative to the ubiquitous self-pMHC array on an APC. Using optical traps, we determine physicochemical triggering thresholds based on load and force direction. Strikingly, chemical thresholds in the absence of external load require orders of magnitude higher pMHC numbers than observed physiologically...
August 15, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28811090/guanosine-exerts-antiplatelet-and-antithrombotic-properties-through-an-adenosine-related-camp-pka-signaling
#14
Francisco Fuentes, Marcelo Alarcón, Lina Badimon, Manuel Fuentes, Karl-Norbert Klotz, Gemma Vilahur, Sonja Kachler, Teresa Padró, Iván Palomo, Eduardo Fuentes
BACKGROUND: Guanosine is a natural product and an endogenous nucleoside that has shown to increase during myocardial ischemia. Platelets are critically involved in ischemic coronary events. It remains unknown, however, whether guanosine may affect platelet activation and function. We sought to investigate the potential antiplatelet and antithrombotic properties of guanosine and decipher the mechanisms behind. METHODS: We firstly assessed the effects of guanosine on platelet activation/aggregation upon stimulation with several platelet agonists including adenosine diphosphate (ADP), collagen, arachidonic acid (AA), and TRAP-6...
August 7, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28810872/-repel-all-biters-an-enhanced-collection-of-endophilic-anopheles-gambiae-and-anopheles-arabiensis-in-cdc-light-traps-from-the-kagera-region-of-tanzania-in-the-presence-of-a-combination-mosquito-net-impregnated-with-piperonyl-butoxide-and-permethrin
#15
Corey LeClair, Judith Cronery, Enock Kessy, Elsa V E Tomás, Yohannes Kulwa, Franklin W Mosha, Mark Rowland, Natacha Protopopoff, J Derek Charlwood
BACKGROUND: Mosquito nets containing synergists designed to overcome metabolic resistance mechanisms in vectors have been developed. These may enhance excitability in the mosquitoes and affect how they respond to CDC light-traps. Investigating the behaviour of vectors of disease in relation to novel mosquito nets is, therefore, essential for the design of sampling and surveillance systems. METHODS: In an initial experiment in Muleba, Tanzania, nine bedrooms from three housing clusters were sampled...
August 15, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28810860/tartrate-resistant-acid-phosphate-as-biomarker-of-bone-turnover-over-the-lifespan-and-different-physiologic-stages-in-sheep
#16
José A Camassa, Camila C Diogo, João P A Bordelo, Marília de A Bonelli, Carlos A Viegas, Jorge T Azevedo, Nuno Dourado, Isabel R Dias
BACKGROUND: Currently, the best resources for assessment of bone tissue using imaging techniques are expensive and available in few medical facilities, thus serum or urinary bone turnover biomarkers could be useful as early indicators of prognosis. However, there is a wide range of variability in bone turnover markers due to several factors, such as different ages and metabolic stages, thus it is important to have as much data published on the subject as possible. The aim of this study was therefore to generate a reference range for alkaline phosphatase (ALP) and tartrate-resistant acid phosphatase (TRAP) and validate the already published data...
August 15, 2017: BMC Veterinary Research
https://www.readbyqxmd.com/read/28810612/effect-of-opg-gene-mutation-on-protein-expression-and-biological-activity-in-osteoporosis
#17
Shuhui Qin, Qiuping Zhang, Li Zhang
The effect of an osteoprotegerin (OPG) gene mutation was investigated on its protein expression and biological activity in osteoporosis. The pcDNA3.0-OPG plasmid or wild-type plasmid were transfected into HEK293 cells. Osteoclast tartrate-resistant acid phosphatase (TRAP) staining and counting were then performed, and the expression of genes related to osteoclast differentiation and activation were measured by RT-PCR. The wild-type or mutant-type OPG at concentrations of 0, 10, 20, 50 and 100 ng/ml were added respectively to RAW264...
August 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28810524/pioglitazone-induced-bone-loss-in-diabetic-rats-and-its-amelioration-by-berberine-a-portrait-of-molecular-crosstalk
#18
Mohammad Adil, Mohd Nizam Mansoori, Divya Singh, Amit Dattatraya Kandhare, Manju Sharma
Diabetes mellitus and osteoporosis both are high prevalence disorders, especially in the elderly population. Pioglitazone, a PPAR-γ agonist associated with bone loss and risk of fracture in type 2 diabetes mellitus patients. In this study, ameliorative effect of berberine against pioglitazone-induced bone loss in diabetic rats and possible mechanisms has been explored. Diabetes was induced in male Wistar albino rats by streptozotocin (65 mg/kg, i.v.) after 15min of nicotinamide (230mg/kg, i.p.) administration...
August 11, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28810232/microfluidic-dielectrophoresis-device-for-trapping-counting-and-detecting-shewanella-oneidensis-at-the-cell-level
#19
Xiangyu Chen, Zhiting Liang, Daobo Li, Ying Xiong, Penghui Xiong, Yong Guan, Shuangyue Hou, Yue Hu, Shan Chen, Gang Liu, Yangchao Tian
Shewanella oneidensis, a model organism for electrochemical activity bacteria, has been widely studied at the biofilm level. However, to obtain more information regarding this species, it is essential to develop an approach to trap and detect S. oneidensis at the cell level. In this study, we report a rapid and label-free microfluidic platform for trapping, counting and detecting S. oneidensis cells. A microfluidic chip was integrated with a modified dielectrophoresis (DEP) trapping technique and hole arrays of different hole sizes...
August 8, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28810208/tungsten-doped-tio2-reduced-graphene-oxide-nano-composite-photocatalyst-for-degradation-of-phenol-a-system-to-reduce-surface%C3%A2-and-bulk-electron-hole-recombination
#20
Manisha Yadav, Asha Yadav, Rohan Fernandes, Yaksh Popat, Michele Orlandi, Alpa Dashora, D C Kothari, Antonio Miotello, B L Ahuja, Nainesh Patel
Recombination of photogenerated charges is the main factor affecting the photocatalytic activity of TiO2. Here, we report a combined strategy of suppressing both the bulk as well as the surface recombination processes by doping TiO2 with tungsten and forming a nanocomposite with reduced graphene oxide (rGO), respectively. Sol-gel method was used to dope and optimize the concentration of W in TiO2 powder. UV-Vis, XPS, PL and time resolved PL spectra along with DFT calculations indicate that W(6+) in TiO2 lattice creates an impurity level just below the conduction band of TiO2 to act as a trapping site of electrons, which causes to improve the lifetime of the photo-generated charges...
August 12, 2017: Journal of Environmental Management
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