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https://www.readbyqxmd.com/read/28735415/cfd-simulation-of-aerosol-delivery-to-a-human-lung-via-surface-acoustic-wave-nebulization
#1
Morteza Yousefi, Oveis Pourmehran, Mofid Gorji-Bandpy, Kiao Inthavong, Leslie Yeo, Jiyuan Tu
Administration of drug in the form of particles through inhalation is generally preferable in the treatment of respiratory disorders. Conventional inhalation therapy devices such as inhalers and nebulizers, nevertheless, suffer from low delivery efficiencies, wherein only a small fraction of the inhaled drug reaches the lower respiratory tract. This is primarily because these devices are not able to produce a sufficiently fine drug mist that has aerodynamic diameters on the order of a few microns. This study employs computational fluid dynamics to investigate the transport and deposition of the drug particles produced by a new aerosolization technique driven by surface acoustic waves (SAWs) into an in silico lung model geometrically reconstructed using computed tomography scanning...
July 22, 2017: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/28735233/a-model-system-to-mimic-environmentally-active-surface-film-roughness-and-hydrophobicity
#2
Jacob S Grant, Scott K Shaw
This work presents the development and initial assessment of a laboratory platform to allow quantitative studies on model urban films. The platform consists of stearic acid and eicosane mixtures that are solution deposited from hexanes onto smooth, solid substrates. We show that this model has distinctive capabilities to better mimic a naturally occurring film's morphology and hydrophobicity, two important parameters that have not previously been incorporated into model film systems. The physical and chemical properties of the model films are assessed using a variety of analytical instruments...
July 14, 2017: Chemosphere
https://www.readbyqxmd.com/read/28735211/runoff-initiation-soil-detachment-and-connectivity-are-enhanced-as-a-consequence-of-vineyards-plantations
#3
A Cerdà, S D Keesstra, J Rodrigo-Comino, A Novara, P Pereira, E Brevik, A Giménez-Morera, M Fernández-Raga, M Pulido, S di Prima, A Jordán
Rainfall-induced soil erosion is a major threat, especially in agricultural soils. In the Mediterranean belt, vineyards are affected by high soil loss rates, leading to land degradation. Plantation of new vines is carried out after deep ploughing, use of heavy machinery, wheel traffic, and trampling. Those works result in soil physical properties changes and contribute to enhanced runoff rates and increased soil erosion rates. The objective of this paper is to assess the impact of the plantation of vineyards on soil hydrological and erosional response under low frequency - high magnitude rainfall events, the ones that under the Mediterranean climatic conditions trigger extreme soil erosion rates...
July 20, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28735210/moisture-content-prediction-in-poultry-litter-using-artificial-intelligence-techniques-and-monte-carlo-simulation-to-determine-the-economic-yield-from-energy-use
#4
José Octavio Rico-Contreras, Alberto Alfonso Aguilar-Lasserre, Juan Manuel Méndez-Contreras, Jhony Josué López-Andrés, Gabriela Cid-Chama
The objective of this study is to determine the economic return of poultry litter combustion in boilers to produce bioenergy (thermal and electrical), as this biomass has a high-energy potential due to its component elements, using fuzzy logic to predict moisture and identify the high-impact variables. This is carried out using a proposed 7-stage methodology, which includes a statistical analysis of agricultural systems and practices to identify activities contributing to moisture in poultry litter (for example, broiler chicken management, number of air extractors, and avian population density), and thereby reduce moisture to increase the yield of the combustion process...
July 20, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28735204/developing-an-ecosystem-model-of-a-floating-wetland-for-water-quality-improvement-on-a-stormwater-pond
#5
Brendan McAndrew, Changwoo Ahn
An ecosystem model was developed to assist with designing and implementing a floating wetland (FW) for water quality management of urban stormwater ponds, focusing on nitrogen (N) removal. The model is comprised of three linked submodels: hydrology, plant growth, and nitrogen. The model was calibrated with the data that resulted from a FW constructed and implemented as part of an interdisciplinary pedagogical project on a university campus, titled "The Rain Project", which raised awareness of stormwater issues while investigating the potential application of green infrastructure for sustainable stormwater management...
July 20, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28735196/molecular-dynamics-simulation-of-sodium-dodecylsulfate-sds-bilayers
#6
Hongshu Zhang, Shiling Yuan, Jichao Sun, Jianqiang Liu, Haiping Li, Na Du, Wanguo Hou
Sodium dodecylsulfate (SDS) - a simple single tailed surfactant (STS) can form stable vesicles from its micellar solution without any additives under the mediation of solid surfaces. To further understand the mechanism of this transition on the molecular level, molecular dynamics simulations are performed to study segments of SDS bilayers (as part of vesicles) in the bulk solution systematically, at the moment that the lower leaflet of bilayers already detached from solid surfaces. The SDS membrane would rather keep their bilayers structure than return to micelles when the initial interdigitated degree (δi) between alkyl chains is more than 8...
July 15, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28735170/effects-of-different-solvents-on-the-conformations-of-apoptotic-cytochrome-c-structural-insights-from-molecular-dynamics-simulation
#7
Gurusamy Muneeswaran, Subramanian Kartheeswaran, Kaliappan Muthukumar, Christopher D Dharmaraj, Chandran Karunakaran
Cytochrome c (cyt-c) upon binding with cardiolipin acquires peroxidase activity and is strictly connected to the pathogenesis of many human diseases including neurodegenerative and cardiovascular diseases. Interaction of cyt-c with cardiolipin mimics partial unfolding/conformational changes of cyt-c in different solvent environments. Dynamic pictures of these conformational changes of cyt-c are crucial in understanding their physiological roles in mitochondrial functions. Therefore, atomistic molecular dynamics (MD) simulations have been carried out to investigate the effect of different solvents (water, urea/water, MeOH and DMSO) on the structure and conformations of apoptotic cyt-c (Fe(3+))...
July 14, 2017: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/28735113/characterisation-of-the-secondary-neutron-field-generated-by-a-compact-pet-cyclotron-with-mcnp6-and-experimental-measurements
#8
D Alloni, M Prata
The production of the most common used PET radioisotope Fluorine-18 with commercial cyclotrons is obtained from the (18)O(p,n)(18)F nuclear reaction when (18)O-enriched water is bombarded with a proton beam. We present the characterization of the secondary neutron field spectra produced by this reaction in different locations around the cyclotron, through a comparison between MCNP6 Monte Carlo simulation results and experimental data obtained with Neutron Activation Analysis (NAA) of thin target foils of different materials...
July 17, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28735086/a-series-of-population-models-for-hyphantria-cunea-with-delay-and-seasonality
#9
Haixia Lu, Haitao Song, Huaiping Zhu
In this paper, we establish and study a basic stage-structured model for the population of Hyphantria cunea, a delay differentialequation model and a model incorporating the resource and seasonality. By introducing the population reproduction number R0, we show that R0 acts as a threshold parameter for the existence and stability of equilibria. The trivial equilibria of the above models are all globally asymptotically stable when R0<1; the basic model and the delay-differential model have a unique positive equilibrium respectively, and they are both locally asymptotically stable when R0>1; the model with periodic season is uniformly persistent and admits a positive periodic solution if R0>1...
July 19, 2017: Mathematical Biosciences
https://www.readbyqxmd.com/read/28735012/fgwas-functional-genome-wide-association-analysis
#10
Chao Huang, Paul Thompson, Yalin Wang, Yang Yu, Jingwen Zhang, Dehan Kong, Rivka R Colen, Rebecca C Knickmeyer, Hongtu Zhu
Functional phenotypes (e.g., subcortical surface representation), which commonly arise in imaging genetic studies, have been used to detect putative genes for complexly inherited neuropsychiatric and neurodegenerative disorders. However, existing statistical methods largely ignore the functional features (e.g., functional smoothness and correlation). The aim of this paper is to develop a functional genome-wide association analysis (FGWAS) framework to efficiently carry out whole-genome analyses of functional phenotypes...
July 19, 2017: NeuroImage
https://www.readbyqxmd.com/read/28734971/robotic-assistance-confers-ambidexterity-to-laparoscopic-surgeons
#11
Souzana Choussein, Serene S Srouji, Leslie V Farland, Ashley Wietsma, Stacey A Missmer, Michael Hollis, Richard N Yu, Charles N Pozner, Antonio R Gargiulo
STUDY OBJECTIVE: To examine whether a robotic surgical platform can complement the fine motor skills of the non-dominant hand, compensating for the innate difference in dexterity between the surgeon's hands, thereby conferring virtual ambidexterity. DESIGN: Crossover intervention study. DESIGN CLASSIFICATION: Level II-1 evidence. SETTING: Centers for medical simulation of two tertiary care hospitals of Harvard Medical School...
July 19, 2017: Journal of Minimally Invasive Gynecology
https://www.readbyqxmd.com/read/28734957/effect-of-schwertmannite-and-jarosite-on-the-formation-of-hypoxic-blackwater-during-inundation-of-grass-material
#12
Chamindra L Vithana, Leigh A Sullivan, Troy Shepherd
This study focused on understanding the effect of schwertmannite and jarosite, commonly found in floodplains containing acid sulfate soil materials, on the characteristics of the hypoxic blackwaters that can form when floodplain vegetation experiences prolonged inundation. The formation of these 'blackwaters' was simulated in the laboratory by inundating flood-intolerant pasture grass leaf material in both the presence of schwertmannite/jarosite (schwertmannite and jarosite treatments) minerals and their absence (control treatment) at 27...
July 17, 2017: Water Research
https://www.readbyqxmd.com/read/28734949/the-program-evaluation-committee-in-action-lessons-learned-from-a-general-surgery-residency-s-experience
#13
Shanley B Deal, Heather Seabott, Lily Chang, Adnan A Alseidi
OBJECTIVE: To evaluate the success of the annual program evaluation process and describe the experience of a Program Evaluation Committee for a General Surgery residency program. DESIGN: We conducted a retrospective review of the Program Evaluation Committee's meeting minutes, data inputs, and outcomes from 2014 to 2016. We identified top priorities by year, characterized supporting data, summarized the improvement plans and outcome measures, and evaluated whether the outcomes were achieved at 1 year...
July 19, 2017: Journal of Surgical Education
https://www.readbyqxmd.com/read/28734948/the-effectiveness-of-a-simulation-based-flipped-classroom-in-the-acquisition-of-laparoscopic-suturing-skills-in-medical-students-a-pilot-study
#14
Hsin-Yi Chiu, Yi-No Kang, Wei-Lin Wang, Hung-Chang Huang, Chien-Chih Wu, Wayne Hsu, Yiu-Shun Tong, Po-Li Wei
OBJECTIVE: To evaluate the effectiveness of a simulation-based flipped classroom in gaining the laparoscopic skills in medical students. DESIGN: An intervention trial. SETTING: Taipei Medical University Hospital, an academic teaching hospital. PARTICIPANTS AND METHODS: Fifty-nine medical students participating in a 1-hour laparoscopic skill training session were randomly assigned to a conventional classroom (n = 29) or a flipped classroom approach (n = 30) based on their registered order...
July 19, 2017: Journal of Surgical Education
https://www.readbyqxmd.com/read/28734936/rehabilitation-interventions-for-upper-limb-function-in-the-first-four-weeks-following-stroke-a-systematic-review-and-meta-analysis-of-the-evidence
#15
REVIEW
Kimberley A Wattchow, Michelle N McDonnell, Susan L Hillier
OBJECTIVE: To investigate the therapeutic interventions reported in the research literature, and synthesize their effectiveness in improving upper limb (UL) function in the first four weeks post-stroke. DATA SOURCES: Electronic databases, trial registries and hand searching was conducted, from inception until June 2016. STUDY SELECTION: Randomised controlled trials (RCTs), controlled trials and interventional studies with pre/post-test design were included for adults within four weeks of any type of stroke with UL impairment...
July 19, 2017: Archives of Physical Medicine and Rehabilitation
https://www.readbyqxmd.com/read/28734901/gastroresistant-oral-peptide-for-fluorescence-imaging-of-colonic-inflammation
#16
Paola Luciani, Ander Estella-Hermoso de Mendoza, Tommaso Casalini, Silvia Lang, Kirstin Atrott, Marianne R Spalinger, Anna Pratsinis, Jens Sobek, Isabelle Frey-Wagner, Jens Schumacher, Jean-Christophe Leroux, Gerhard Rogler
The use of molecular markers for inflammation in the gastrointestinal tract could empower optical imaging modalities for early diagnosis and eventually personalized timely treatments. A major hurdle to the widespread use of functional fluorescence imaging is the absence of suitable contrast agents, in particular to be administered via the oral route due to the usual proteolytic susceptibility of the biomarkers. By designing a retro-inverso peptide, starting from a previously described sequence specific for N-cadherin, we achieved resistance to gastrointestinal degradation and even slightly improved specificity towards the target, both in ex vivo and in vivo experimental colitis...
July 19, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28734872/modeling-the-cleavage-of-von-willebrand-factor-by-adamts13-protease-in-shear-flow
#17
Brooke Huisman, Masoud Hoore, Gerhard Gompper, Dmitry A Fedosov
Von Willebrand factor (VWF) is a key protein in hemostasis as it mediates adhesion of blood platelets to a site of vascular injury. A proper distribution of VWF lengths is important for normal functioning of hemostatic processes, because a diminished number of long VWF chains may significantly limit blood clotting and lead to bleeding, while an abundant number of long VWFs may result in undesired thrombotic events. VWF size distribution is controlled by ADAMTS13 protease, which can cleave VWF chains beyond a critical shear rate when the chains are stretched enough such that cleavage sites become accessible...
July 19, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28734797/the-effects-pf-continuously-acoustical-stress-on-cortisol-in-milkfish-chanos-chanos
#18
Chih An Wei, Tzu Hao Lin, Ruo Dong Chen, Yung-Che Tseng, Yi Ta Shao
Strong underwater acoustic noise has been known that may cause hearing loss and actual stress in teleost. However, the long-term physiological effects of relatively quiet but continuously noise on fish were less understood. In present study, milkfish, Chanos chanos, were exposed to the simulated-wind farm noise either quiet (109 dB re 1 μPa / 125.4 Hz; approx. 10-100m distant from the wind farm) or noisy (138 dB re 1 μPa / 125.4 Hz; nearby the wind farm) conditions for 24 hr, 3 days and 1 week. Comparing to the control group (80 dB re 1 μPa / 125...
July 19, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28734719/coronoid-reconstruction-using-osteochondral-grafts-a-biomechanical-study
#19
Enrico Bellato, Youngbok Kim, James S Fitzsimmons, Lawrence J Berglund, Alexander W Hooke, Daniel R Bachman, Shawn W O'Driscoll
HYPOTHESIS: The purposes of this study were to test the hypothesis that coronoid deficiency in the setting of posteromedial rotatory instability (PMRI) must be reconstructed to restore articular contact pressures to normal and to compare 3 different osteochondral grafts for this purpose. METHODS: After creation of a anteromedial fracture, six cadaveric elbows were tested under gravity varus stress using a custom-made machine designed to simulate muscle loads and to passively flex the elbow...
July 19, 2017: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/28734705/a-proficiency-based-stepwise-endovascular-curricular-training-prospect-program-enhances-operative-performance-in-real-life-a-randomised-controlled-trial
#20
H Maertens, R Aggarwal, N Moreels, F Vermassen, I Van Herzeele
OBJECTIVES: Healthcare evolution requires optimisation of surgical training to provide safe patient care. Operating room performance after completion of proficiency based training in vascular surgery has not been investigated. DESIGN: A randomised controlled trial evaluated the impact of a Proficiency based Stepwise Endovascular Curricular Training program (PROSPECT) on the acquisition of endovascular skills and the transferability of these skills to real life interventions...
July 19, 2017: European Journal of Vascular and Endovascular Surgery
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