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https://www.readbyqxmd.com/read/29458206/mucoadhesive-self-emulsifying-delivery-systems-for-ocular-administration-of-econazole
#1
Ibrahim A Elbahwy, Noemi Lupo, Hany M Ibrahim, Hatem R Ismael, Alaa A Kasem, Cagri Caliskan, Barbara Matuszczak, Andreas Bernkop-Schnürch
AIM: Development of mucoadhesive self-emulsifying drug delivery systems (SEDDS) providing a prolonged ocular residence time for poorly soluble active pharmaceutical ingredient. METHODS: L-Cysteine was covalently linked to 6-mercaptonicotinamide. The obtained ligand, Cysteine-6- mercaptonicotinamide (Cys-6-MNA) was attached to Eudragit® L100-55 via a carbodiimide mediated amide bond formation. The resulting entirely S-protected thiolated Eudragit® L100-55 was characterized regarding the degree of modification as well as stability toward oxidation in the presence of strong oxidizing agent (H2 O2 )...
February 16, 2018: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29458201/computer-assisted-surgery-in-acetabular-fractures-virtual-reduction-of-acetabular-fracture-using-the-first-patient-specific-biomechanical-model-simulator
#2
M Boudissa, H Oliveri, M Chabanas, J Tonetti
Preoperative planning for the management of acetabular fracture is founded on geometric models allowing virtual repositioning of the bone fragments, but not taking account of soft tissue and the realities of the surgical procedure. The present technical note reports results using the first simulator to be based on a patient-specific biomechanical model, simulating the action of forces on the fragments and also the interactions between soft issue and bone: muscles, capsules, ligaments, and bone contacts. In all 14 cases, biomechanical simulation faithfully reproduced the intraoperative behavior of the various bone fragments and reduction quality...
February 16, 2018: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/29458124/tryptophan-mediated-dimerization-of-the-tssl-transmembrane-anchor-is-required-for-type-vi-secretion-system-activity
#3
Abdelrahim Zoued, Jean-Pierre Duneau, Eric Durand, Alexandre P España, Laure Journet, Françoise Guerlesquin, Eric Cascales
The Type VI secretion system (T6SS) is a multiprotein complex used by bacteria to deliver effectors into target cells. The T6SS comprises a bacteriophage-like contractile tail structure anchored to the cell envelope by a membrane complex constituted of the TssJ outer membrane lipoprotein and the TssL and TssM inner membrane proteins. TssJ establishes contact with the periplasmic domain of TssM whereas the transmembrane segments of TssM and its cytoplasmic domain interact with TssL. TssL protrudes in the cytoplasm but is anchored by a C-terminal transmembrane helix (TMH)...
February 16, 2018: Journal of Molecular Biology
https://www.readbyqxmd.com/read/29458110/investigation-of-adhesive-interactions-in-the-specific-targeting-of-triptorelin-conjugated-peg-coated-magnetite-nanoparticles-to-breast-cancer-cells
#4
Jingjie Hu, Sina Youssefian, John Obayemi, Karen Malatesta, Nima Rahbar, Winston Soboyejo
The understanding of adhesive interaction at the nanoscale between functionalized nanoparticles and biological cells is of great importance to develop effective theranostic nanocarriers for targeted cancer therapy. Here, we report a combination of experimental and computational approaches to evaluate the adhesion between Triptorelin (a Luteinizing Hormone-Releasing Hormone (LHRH) agonist)-conjugated poly-(ethylene glycol) (PEG)-coated magnetite nanoparticles (Triptorelin-MNPs) and breast cells. The adhesion forces between Triptorelin-MNPs and normal/cancerous breast cells are obtained using atomic force microscopy...
February 16, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29458089/structural-and-biophysical-insight-into-dual-site-binding-of-the-protoberberine-alkaloid-palmatine-to-parallel-g-quadruplex-dna-using-nmr-fluorescence-and-circular-dichroism-spectroscopy
#5
Kumar Padmapriya, Ritu Barthwal
Plant derived small molecules, which interact with and stabilize G-quadruplex DNA, act as inhibitors of telomere elongation and oncogene expression in humans. The inhibition of telomerase enzyme has immense potential since it is over expressed in most cancer cells. Interaction of palmatine, an antitumor alkaloid, to parallel G-quadruplex DNA, [d(TTGGGGT)]4 and [d(TTAGGGT)]4 , has been investigated using Nuclear Magnetic Resonance (NMR), fluorescence and Circular Dichroism (CD) spectroscopy. Titrations were monitored by1 H and31 P NMR spectra and solution structure of palmatine-[d(TTGGGGT)]4 complex was obtained by restrained Molecular Dynamics (rMD) simulations using distance restraints from 2D NOESY spectra...
February 16, 2018: Biochimie
https://www.readbyqxmd.com/read/29458035/lectin-carbohydrate-complex-evaluation-by-chemiluminescence
#6
Luiza Rayanna Amorim de Lima, Lúcia Patrícia Bezerra Gomes da Silva, Sinara Mônica Vitalino de Almeida, Thiago Barbosa Cahú, Eduardo Isidoro Carneiro Beltrão, Luiz Bezerra de Carvalho Júnior
In order to characterize the affinity between specific carbohydrate-binding proteins such as lectins, a model is proposed to study these interactions using a polysaccharide membrane to simulate such adsorption. Here, lectin-carbohydrate interactions were chemiluminescently investigated using lectins conjugated to acridinium ester (AE) and polysaccharides composed of their respective specific carbohydrates. The lectin-AE conjugates were incubated with discs (0.0314-0.6358 cm2 ) of phytagel, chitosan and carrageenan...
February 16, 2018: Analytical Biochemistry
https://www.readbyqxmd.com/read/29457969/an-evaluation-of-the-operational-model-when-applied-to-quantify-functional-selectivity
#7
Xiao Zhu, David B Finlay, Michelle Glass, Stephen B Duffull
BACKGROUND AND PURPOSE: Functional selectivity describes the ability of ligands to differentially regulate multiple signalling pathways when coupled to a single receptor and the operational model is commonly used to analyse these data. Here, we assess the mathematical properties of the operational model and evaluate the impact of fixing parameters on model performance. EXPERIMENTAL APPROACH: The operational model was evaluated using both a mathematical identifiability analysis and simulation...
February 19, 2018: British Journal of Pharmacology
https://www.readbyqxmd.com/read/29457950/knowledge-and-skills-of-critical-care-nurses-in-assisting-with-intubation
#8
Chris Williams, Andrew Parry
Assisting with tracheal intubation is an aspect of clinical practice that requires knowledge and skill if the procedure is to be carried out in a timely and safe manner. Maintaining this knowledge and skill requires good quality education and regular opportunities to practise. These two factors appear to be inconsistent in critical care units. This article details an audit performed on a large tertiary referral centre critical care unit. It was undertaken in two phases: the first was a self-assessment of knowledge and the second was a practical assessment of the audit subjects in a simulated setting...
February 22, 2018: British Journal of Nursing: BJN
https://www.readbyqxmd.com/read/29457923/flipping-social-determinants-on-its-head-medical-student-perspectives-on-the-flipped-classroom-and-simulated-patients-to-teach-social-determinants-of-health
#9
N Gostelow, J Barber, F Gishen, A Berlin
BACKGROUND: Inequalities in healthcare are increasing. Engaging medical students to tackle this urgent challenge alongside clinical sciences can be demanding. This study examines medical student perceptions of a flipped approach to health inequalities co-designed by faculty and sixth-year students. INNOVATION: A flipped learning session was piloted for year 4 medical students combining an online lesson followed by a tutorial with a simulated patient. METHODS: A mixed-methods approach collected questionnaire data using 4-point Likert scales and free text answers...
February 19, 2018: Medical Teacher
https://www.readbyqxmd.com/read/29457906/optimized-phenotypic-biomarker-discovery-and-confounder-elimination-via-covariate-adjusted-projection-to-latent-structures-from-metabolic-spectroscopy-data
#10
Joram M Posma, Isabel Garcia-Perez, Timothy M D Ebbels, John C Lindon, Jeremiah Stamler, Paul Elliott, Elaine Holmes, Jeremy K Nicholson
Metabolism is altered by genetics, diet, disease status, environment and many other factors. Modelling either one of these is often done without considering the effects of the other covariates. Attributing differences in metabolic profile to one of these factors needs to be done while controlling for the metabolic influence of the rest. We describe here a data analysis framework and novel confounder-adjustment algorithm for multivariate analysis of metabolic profiling data. Using simulated data we show that similar numbers of true associations and significantly less false positives are found compared to other commonly used methods...
February 19, 2018: Journal of Proteome Research
https://www.readbyqxmd.com/read/29457870/effect-of-the-flow-profile-on-separation-efficiency-in-pressure-assisted-reversed-polarity-capillary-zone-electrophoresis-of-anions-simulation-and-experimental-evaluation
#11
Gabor Jarvas, Marton Szigeti, Andras Guttman
Capillary electrophoresis connected to electrospray ionization mass spectrometry is a promising combination to analyze complex biological samples. The use of sheathless electrospray ionization interfaces, such as a porous nanoelectrospray capillary emitter, requires the application of forward flow (either by pressure or electroosmosis) to maintain the electrospray process. The analysis of solute molecules with strong negative charges (e.g., aminopyrenetrisulfonate labeled glycans) necessitates a reversed-polarity capillary electrophoresis separation mode, in which case the electroosmotic flow is counter current, thus pressure assistance is necessary...
February 19, 2018: Journal of Separation Science
https://www.readbyqxmd.com/read/29457869/assessment-of-the-spectrum-of-hepatic-encephalopathy-a-multi-center-study
#12
Bradley Reuter, Kara Walter, Julien Bissonnette, Michael D Leise, Jennifer Lai, Puneeta Tandon, Patrick S Kamath, Scott W Biggins, Christopher F Rose, James B Wade, Jasmohan S Bajaj
Hepatic encephalopathy (HE) is a major cause of morbidity in cirrhosis. However its severity assessment is often subjective, which needs to be studied systematically. AIM: To determine how accurately trainee and non-trainee practitioners grade and manage HE patients throughout its severity. METHODS: We performed a survey study using standardized simulated patient videos at 4 US and 3 Canadian centers. Participants were trainees (gastroenterology/hepatology fellows) and non-trainees (faculty, nurse practitioners, physician assistants)...
February 19, 2018: Liver Transplantation
https://www.readbyqxmd.com/read/29457812/diffusive-interaction-of-multiple-surface-nanobubbles-shrinkage-growth-and-coarsening
#13
Xiaojue Zhu, Roberto Verzicco, Xuehua Zhang, Detlef Lohse
Surface nanobubbles are nanoscopic spherical-cap shaped gaseous domains on immersed substrates which are stable, even for days. After the stability of a single surface nanobubble has been theoretically explained, i.e. contact line pinning and gas oversaturation are required to stabilize it against diffusive dissolution [Lohse and Zhang, Phys. Rev. E, 2015, 91, 031003(R)], here we focus on the collective diffusive interaction of multiple nanobubbles. For that purpose we develop a finite difference scheme for the diffusion equation with the appropriate boundary conditions and with the immersed boundary method used to represent the growing or shrinking bubbles...
February 19, 2018: Soft Matter
https://www.readbyqxmd.com/read/29457809/domain-size-polydispersity-effects-on-the-structural-and-dynamical-properties-in-lipid-monolayers-with-phase-coexistence
#14
Elena Rufeil-Fiori, Adolfo J Banchio
In lipid monolayers with phase coexistence, domains of the liquid-condensed phase always present size polydispersity. However, very few theoretical works consider size distribution effects on the monolayer properties. Because of the difference in surface densities, domains have excess dipolar density with respect to the surrounding liquid expanded phase, originating a dipolar inter-domain interaction. This interaction depends on the domain area, and hence the presence of a domain size distribution is associated with interaction polydispersity...
February 19, 2018: Soft Matter
https://www.readbyqxmd.com/read/29457775/mechanical-properties-of-hollow-and-water-filled-graphyne-nanotube-and-carbon-nanotube-hybrid-structure
#15
Guangping Lei, Yayun Zhang, Hantao Liu, Fenhong Song
By performing molecular dynamics (MD) simulations, a GNT/CNT hybrid structure constructed via combing (6,6) graphyne nanotube (GNT) with (6,6) carbon nanotube (CNT) has been designed and investigated. The mechanical properties induced by the percentage of GNT, water content and electric field were examined. Calculation results reveal that the fracture strain and strength of hollow hybrid structure are remarkably smaller than that of perfect (6,6) CNT. In addition, the Young's modulus decreases monotonously with the increase of percentage of GNT...
February 19, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29457760/a-systematic-review-of-serious-games-in-medical-education-quality-of-evidence-and-pedagogical-strategy
#16
Iouri Gorbanev, Sandra Agudelo-Londoño, Rafael A González, Ariel Cortes, Alexandra Pomares, Vivian Delgadillo, Francisco J Yepes, Óscar Muñoz
INTRODUCTION: The literature shows an optimistic landscape for the effectiveness of games in medical education. Nevertheless, games are not considered mainstream material in medical teaching. Two research questions that arise are the following: What pedagogical strategies do developers use when creating games for medical education? And what is the quality of the evidence on the effectiveness of games? METHODS: A systematic review was made by a multi-disciplinary team of researchers following the Cochrane Collaboration Guidelines...
December 2018: Medical Education Online
https://www.readbyqxmd.com/read/29457758/appraising-cervical-mucus-a-new-approach-to-evaluating-contraceptives
#17
Leo Han, Emily Padua, Alison Edelman, Jeffrey T Jensen
PURPOSE: Timing of sample collection represents a major source of variability in studies evaluating the effects of administered agents on cervical mucus in naturally-cycling women. We sought to create and validate an artificial model of the cervical mucus cycle using exogenous E2 and P4 replacement in ovarian suppressed women. MATERIALS AND METHODS: We conducted a prospective experiment (clinicaltrials.gov, NCT02969590) examining cervical mucus changes in six women during natural and artificial menstrual cycles [leuprolide acetate, estradiol transdermal patch (0...
February 19, 2018: European Journal of Contraception & Reproductive Health Care
https://www.readbyqxmd.com/read/29457713/probing-structural-changes-among-analogous-inhibitor-bound-forms-of-hiv-1-protease-and-a-drug-resistant-mutant-in-solution-by-nuclear-magnetic-resonance
#18
Shahid N Khan, John D Persons, Janet L Paulsen, Michel Guerrero, Celia A Schiffer, Nese Kurt-Yilmaz, Rieko Ishima
In the era of state-of-the-art inhibitor design and high-resolution structural studies, detection of significant but small protein structural differences in the inhibitor-bound forms is critical to further developing the inhibitor. Here, we probed differences in HIV-1 protease (PR) conformation among darunavir and four analogous inhibitor-bound forms and compared them with a drug-resistant mutant using nuclear magnetic resonance chemical shifts. Changes in amide chemical shifts of wild-type (WT) PR among these inhibitor-bound forms, ΔCSP, were subtle but detectable and extended >10 Å from the inhibitor-binding site, asymmetrically between the two subunits of PR...
February 19, 2018: Biochemistry
https://www.readbyqxmd.com/read/29457682/predictive-models-in-ecotoxicology-bridging-the-gap-between-scientific-progress-and-regulatory-applicability-foreword
#19
Andreas Focks, Francesca Grisoni, Alpar Barsi, Marco Vighi
In the last decades, modelling approaches in the context of environmental risk assessment for chemicals have been under the spotlight of researchers in academia, regulatory bodies and industry. This is because mathematical and simulation models allow to gain deeper mechanistic understanding of fate and effect processes of organic contaminants in the environment. In addition, models make it possible to predict the toxic effects of compounds along with other relevant properties, such as biodegradability, uptake and bioaccumulation...
February 19, 2018: Integrated Environmental Assessment and Management
https://www.readbyqxmd.com/read/29457655/importance-of-growth-rate-on-hg-and-pcb-bioaccumulation-in-fish
#20
Jiajia Li, G Douglas Haffner, Gordon Paterson, David M Walters, Michael D Burtnyk, Ken G Drouillard
To evaluate the effect of fish growth on mercury (Hg) and polychlorinated biphenyls (PCBs) bioaccumulation, a non-steady state toxicokinetic model, combined with a Wisconsin bioenergetics model, was developed to simulate Hg and PCB bioaccumulation in Bluegill (Lepomis macrochirus). The model was validated by comparing observed versus predicted Hg and PCB 180 concentrations across 5 age classes from five different waterbodies across North America. The non-steady state model generated accurate predictions for Hg and PCB bioaccumulation in three of five waterbodies: Apsey, Sharbot and Stonelick Lake...
February 19, 2018: Environmental Toxicology and Chemistry
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