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https://www.readbyqxmd.com/read/28550503/secure-data-aggregation-in-wireless-sensor-network-fujisaki-okamoto-fo-authentication-scheme-against-sybil-attack
#1
K Nirmal Raja, M Maraline Beno
In the wireless sensor network(WSN) security is a major issue. There are several network security schemes proposed in research. In the network, malicious nodes obstruct the performance of the network. The network can be vulnerable by Sybil attack. When a node illicitly assertions multiple identities or claims fake IDs, the WSN grieves from an attack named Sybil attack. This attack threatens wireless sensor network in data aggregation, synchronizing system, routing, fair resource allocation and misbehavior detection...
July 2017: Journal of Medical Systems
https://www.readbyqxmd.com/read/28543610/metallic-nanoparticles-irradiated-by-low-energy-protons-for-radiation-therapy-are-there-significant-physical-effects-to-enhance-the-dose-delivery
#2
Anne-Catherine Heuskin, Bernard Gallez, Olivier Feron, Philippe Martinive, Carine Michiels, Stéphane Lucas
PURPOSE: To identify which physical properties of nanoparticles are correlated to the survival fraction of cells exposed in vitro to low energy protons in combination with nanoparticles. METHODS: The Geant4 simulation toolkit (version 10.3) was used to model nanoparticles of different sizes (5 to 50 nm) and materials (Ti, Zr, Hf, Ta, Au, Pt), with or without an organic capping ensuring biocompatibility and to irradiate them with 1.3 or 4 MeV protons and 5.3 MeV alpha particles...
May 23, 2017: Medical Physics
https://www.readbyqxmd.com/read/28541666/unveiling-the-molecular-structure-of-pulmonary-surfactant-corona-on-nanoparticles
#3
Qinglin Hu, Xuan Bai, Guoqing Hu, Yi Y Zuo
The growing risk of human exposure to airborne nanoparticles (NPs) causes a general concern on the biosafety of nanotechnology. Inhaled NPs can deposit in the deep lung at which interacting with the pulmonary surfactant (PS). Despite the increasing study of nano-bio interactions, detailed molecular mechanisms by which inhaled NPs interact with the natural PS system remain unclear. Using coarse-grained molecular dynamics simulation, we studied the interaction between NPs and the PS system in the alveolar fluid...
May 25, 2017: ACS Nano
https://www.readbyqxmd.com/read/28540814/lyso-thermosensitive-liposomal-doxorubicin-for-treatment-of-bladder-cancer
#4
Andrew S Mikhail, Ayele H Negussie, William F Pritchard, Dieter Haemmerich, David Woods, Ivane Bakhutashvili, Juan Esparza-Trujillo, Sam J Brancato, John Karanian, Piyush K Agarwal, Bradford J Wood
PURPOSE: To evaluate lyso-thermosensitive liposomal doxorubicin (LTLD, ThermoDox(®)) in combination with loco-regional mild hyperthermia (HT) for targeted drug delivery to the bladder wall and potential treatment of bladder cancer. MATERIAL AND METHODS: Porcine in vivo studies were performed with the following groups: (i) intravenous (IV) LTLD with hyperthermia (LTLD + HT); (ii) IV doxorubicin (DOX) with hyperthermia (IV DOX + HT) and (iii) IV LTLD without hyperthermia (LTLD - HT)...
May 10, 2017: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/28536796/development-and-evaluation-of-a-family-of-human-face-and-upper-airway-models-for-the-laboratory-testing-of-orally-inhaled-products
#5
Mark W Nagel, Jason A Suggett, Dominic P Coppolo, Jolyon P Mitchell
Many orally inhaled products are supplied with a facemask instead of a mouthpiece, enabling aerosolized medication to be transferred from the inhaler to the lungs when the user lacks the capability to use a mouthpiece. Until recently, laboratory evaluation of an orally inhaled product-facemask was frequently undertaken by removing the facemask, treating the facemask adapter as being equivalent to a mouthpiece. Measurements of delivered drug mass were therefore subject to bias arising from the absence of dead volume, had the facemask been present...
May 23, 2017: AAPS PharmSciTech
https://www.readbyqxmd.com/read/28535917/sensitivity-evaluation-of-two-commercial-dosimeters-in-detecting-helical-tomotherapy-treatment-delivery-errors
#6
Shrikant Deshpande, Mark Geurts, Philip Vial, Peter Metcalfe, Lois Holloway
PURPOSE: To assess the sensitivity of two commercial dosimetry systems in detecting Helical TomoTherapy (HT) delivery errors. METHOD: Two commercial dosimeters i) MatriXX(Evolution) and ii) ArcCHECK® were considered. Ten retrospective nasopharynx HT patients were analysed. For each patient, error plans were created by independently introducing systematic offsets in: a) Jaw width error ±1, ±1.5 and ±2mm, b) Couch speed error ±2%, ±2.5, ±3% and ±4%, and c) MLC Leaf Open Time (MLCLOT) errors (3 separate MLC errors: either leaf 32 open or leaf 42 remains open during delivery, and 4% random reductions in MLCLOT)...
May 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/28535343/tuning-adsorption-duration-to-control-the-diffusion-of-a-nanoparticle-in-adsorbing-polymers
#7
Xuezheng Cao, Holger Merlitz, Chen-Xu Wu
Controlling the nanoparticle (NP) diffusion in polymers is a prerequisite to obtain polymer nanocomposites (PNCs) with desired dynamical and rheological properties, and to achieve targeted delivery of nanomedicine in biological systems. Here we determinate the suppression mechanism of direct NP-polymer attraction to hamper the NP mobility in adsorbing polymers, and then quantify the dependence of the effective viscosity \eta_{eff} felt by the NP on the adsorption duration \tau_{ads} of polymers on the NP, using scaling theory analysis and molecular dynamics (MD) simulations...
May 23, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28534827/optimizing-prednisolone-loading-into-distiller-s-dried-grain-kafirin-microparticles-and-in-vitro-release-for-oral-delivery
#8
Esther T L Lau, Stuart K Johnson, Barbara A Williams, Deirdre Mikkelsen, Elizabeth McCourt, Roger A Stanley, Ram Mereddy, Peter J Halley, Kathryn J Steadman
Kafirin microparticles have potential as colon-targeted delivery systems because of their ability to protect encapsulated material from digestive processes of the upper gastrointestinal tract (GIT). The aim was to optimize prednisolone loading into kafirin microparticles, and investigate their potential as an oral delivery system. Response surface methodology (RSM) was used to predict the optimal formulation of prednisolone loaded microparticles. Prednisolone release from the microparticles was measured in simulated conditions of the GIT...
May 19, 2017: Pharmaceutics
https://www.readbyqxmd.com/read/28534298/formulation-and-in-vitro-characterization-of-bioactive-mesoporous-silica-with-doxorubicin-and-metronidazole-intended-for-bone-treatment-and-regeneration
#9
Katarzyna Czarnobaj, Magdalena Prokopowicz, Wiesław Sawicki
The purpose of this study was to evaluate the surface mineralization activity and in vitro drug behavior potential of two forms of mesoporous silica: powder and granulate. Ordered mesoporous SiO2 powder was synthesized by surfactant-assisted sol-gel process using tetraethoxysilane as a silica precursor and hexadecyltrimethylammonium bromide as the structure-directing agent. The granulate was prepared using silica powder and ethyl cellulose as a binding agent. Metronidazole (MT)-an anti-inflammatory substance and doxorubicin hydrochloride (ChD)-an anti-cancer drug were chosen as drug models for delivery studies...
May 22, 2017: AAPS PharmSciTech
https://www.readbyqxmd.com/read/28532085/mesoporous-nano-bioglass-designed-for-the-release-of-imatinib-and-in-vitro-inhibitory-effects-on-cancer-cells
#10
Muhammad Shoaib, Aamer Saeed, Muhammad Saif Ur Rahman, Muhammad Moazzam Naseer
For treating bone cancer, controlled drug delivery is an important strategy. Bioactive scaffolds are widely used biomaterials due to their usefulness in localized drug delivery. The aim of this study was to develop mesoporous bioglass (MBG) with improved bioactivity and controllable drug delivery rate. By using pluronic 123 (P123) as a template, a facile sol-gel route was employed for the synthesis of MBG nanoparticles (NPs). The composition of the prepared sample was estimated by using energy dispersive X-ray spectroscopy (EDX)...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532039/bioactivity-mechanical-properties-and-drug-delivery-ability-of-bioactive-glass-ceramic-scaffolds-coated-with-a-natural-derived-polymer
#11
M Araújo, R Viveiros, A Philippart, M Miola, S Doumett, G Baldi, J Perez, A R Boccaccini, A Aguiar-Ricardo, E Verné
In this work, hybrid melanin-coated bioactive glass-ceramic multifunctional scaffolds were developed and characterized in terms of mechanical strength, in vitro bioactivity in simulated body fluid (SBF) and ability to load ibuprofen. The coated scaffolds exhibited an accelerated bioactivity in comparison with the uncoated ones, being able of developing hydroxyapatite-like crystals after 7days soaking in simulated body fluid (SBF). Besides its positive influence on the scaffolds bioactivity, the melanin coating was able to enhance their mechanical properties, increasing the initial compressive strength by a factor of >2...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28530576/efficient-delivery-of-quercetin-after-binding-to-beta-lactoglobulin-followed-by-formation-soft-condensed-core-shell-nanostructures
#12
Seyedeh Fatemeh Mirpoor, Seyed Mohammad Hashem Hosseini, Abdo-Reza Nekoei
Nature-made inherent transporting property of beta-lactoglobulin (BLG) was exploited to develop delivery systems for quercetin. After binding to BLG, quercetin was nanoencapsulated within soft-condensed nanostructures of BLG and sodium alginate (ALG). Fluorimetry results revealed that quercetin could bind to BLG even at acidic conditions. The amounts of stoichiometry binding (n) were 1.24 and 1.62 at pH values of 4 and 7, respectively. Formation of core-shell type nanostructures was confirmed by transmission electron microscopy...
October 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28530538/qualitative-estimation-of-drug-entrapment-efficiency-in-polymeric-nano-micelles-using-dpd
#13
Farzin Hadizadeh, Jamal Shamsara
BACKGROUND: Dissipative particle dynamics (DPD) is a simulation method that one of its applications is in the field of pharmaceutical science and drug delivery. OBJECTIVE: DPD is employed to study morphology and some other characteristics of polymeric nano-micelles. Two systems were considered in this study: system A which includes curcumin, Polycaprolactone (PCL), Polyethylene glycol (PEG) and water beads and system B which includes paclitaxel, Polylactic acid (PLA), PEG and water beads...
May 22, 2017: Pharmaceutical Nanotechnology
https://www.readbyqxmd.com/read/28530192/preparation-structural-characterisation-and-release-study-of-novel-hybrid-microspheres-entrapping-nanoselenium-produced-by-green-synthesis
#14
Simona Cavalu, Jόszef Prokisch, Vasile Laslo, Simona Vicas
The main goal of this study was to synthesise and characterise different formulations based on alginate and alginate/chitosan microspheres containing nanoselenium (nano-Se) for controlled delivery applications. Nanosize elemental selenium was produced by using probiotic yogurt bacteria (Lactobacillus casei) in a fermentation procedure. The structural and morphological characterisation of the microspheres was performed by Fourier transform infrared (FTIR), X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis...
June 2017: IET Nanobiotechnology
https://www.readbyqxmd.com/read/28529239/formulation-optimization-of-gastro-retention-tablets-of-paeonol-and-efficacy-in-treatment-of-experimental-gastric-ulcer
#15
Xitong Zhang, Yue Zhang, Han Han, Jun Yang, Benliang Xu, Bing Wang, Tong Zhang
This study aims to develop a gastroretentive sustained-release drug delivery system of paeonol using floating properties and to investigate its therapeutic effects in rat models. The gastric retention tablets of paeonol (GRT-Ps) were prepared by a direct compression method, and the Box-Behnken design was used to optimize its formulation. The optimized formulation containing 15% NaHCO3 and a 2:1 ratio of paeonol and HPMC-K4M floated within 1 min and remained afloat for more than 8 h in the simulated gastric fluid (200 mL, pH=1...
May 19, 2017: Chemical & Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/28528578/a-cluster-randomized-trial-to-reduce-caesarean-delivery-rates-in-quebec-cost-effectiveness-analysis
#16
Mira Johri, Edmond S W Ng, Clara Bermudez-Tamayo, Jeffrey S Hoch, Thierry Ducruet, Nils Chaillet
BACKGROUND: Widespread increases in caesarean section (CS) rates have sparked concerns about risks to mothers and infants and rising healthcare costs. A multicentre, two-arm, cluster-randomized trial in Quebec, Canada assessed whether an audit and feedback intervention targeting health professionals would reduce CS rates for pregnant women compared to usual care, and concluded that it reduced CS rates without adverse effects on maternal or neonatal health. The effect was statistically significant but clinically small...
May 22, 2017: BMC Medicine
https://www.readbyqxmd.com/read/28527687/cost-effectiveness-analysis-of-typhoid-conjugate-vaccines-in-five-endemic-low-and-middle-income-settings
#17
Marina Antillón, Joke Bilcke, A David Paltiel, Virginia E Pitzer
BACKGROUND: Typhoid fever remains endemic in low- and middle-income countries. Programmatic use of existing vaccines is limited, but upcoming typhoid conjugate vaccines (TCVs) could warrant wider use. We evaluated the cost-effectiveness of five TCV delivery strategies in three urban areas (Delhi and Kolkata, India and Nairobi, Kenya) and two rural settings (Lwak, Kenya and Dong Thap, Vietnam) with varying incidence. METHODS AND FINDINGS: We evaluated routine infant vaccination with and without catch-up campaigns among older individuals...
May 17, 2017: Vaccine
https://www.readbyqxmd.com/read/28525957/determining-dominant-driving-forces-affecting-controlled-protein-release-from-polymeric-nanoparticles
#18
Josh Smith, Kayla G Sprenger, Rick Liao, Andrea Joseph, Elizabeth Nance, Jim Pfaendtner
Enzymes play a critical role in many applications in biology and medicine as potential therapeutics. One specific area of interest is enzyme encapsulation in polymer nanostructures, which have applications in drug delivery and catalysis. A detailed understanding of the mechanisms governing protein/polymer interactions is crucial for optimizing the performance of these complex systems for different applications. Using a combined computational and experimental approach, this study aims to quantify the relative importance of molecular and mesoscale driving forces to protein release from polymeric nanoparticles...
May 19, 2017: Biointerphases
https://www.readbyqxmd.com/read/28524616/how-to-implement-live-video-recording-in-the-clinical-environment-a-practical-guide-for-clinical-services
#19
Adam Lloyd, Alistair Dewar, Simon Edgar, Dave Caesar, Paul Gowens, Gareth Clegg
BACKGROUND: The use of video in healthcare is becoming more common, particularly in simulation and educational settings. However, video recording live episodes of clinical care is far less routine. AIM: To provide a practical guide for clinical services to embed live video recording. MATERIALS AND METHODS: Using Kotter's 8-step process for leading change, we provide a 'how to' guide to navigate the challenges required to implement a continuous video-audit system based on our experience of video recording in our emergency department resuscitation rooms...
May 19, 2017: International Journal of Clinical Practice
https://www.readbyqxmd.com/read/28523446/in-vitro-quantification-of-luminal-denudation-after-crimping-and-balloon-dilatation-of-endothelialized-covered-stents
#20
Shigeo Ichihashi, Frederic Wolf, Thomas Schmitz-Rode, Kimihiko Kichikawa, Stefan Jockenhoevel, Petra Mela
PURPOSE: Covered stents have been demonstrated to reduce restenosis; however, the membrane's limited biocompatibility can still lead to thrombus formation. To obtain optimal surface hemocompatibility, endothelialization of the luminal surface has been proposed. However, the effect of delivery procedures, such as crimping and balloon dilatation, on the endothelial layer has not been quantified. This study investigated the impact of such procedures on endothelialized covered stents in vitro...
May 18, 2017: Cardiovascular and Interventional Radiology
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