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Emmanouil Glynos, Kyle J Johnson, Bradley Frieberg, Alexandros Chremos, Suresh Narayanan, Georgios Sakellariou, Peter F Green
The surface relaxation dynamics of supported star-shaped polymer thin films are shown to be slower than the bulk, persisting up to temperatures at least 50 K above the bulk glass transition temperature T_{g}^{bulk}. This behavior, exhibited by star-shaped polystyrenes with functionality f=8 arms and molecular weights per arm M_{arm}<M_{e} (M_{e} is the entanglement molecular weight), is shown by molecular dynamics simulations to be associated with a preferential localization of these macromolecules at the free surface...
December 1, 2017: Physical Review Letters
Otto-Patrik Frieberg, Eva Millqvist, Jan Nilsson, Ingrid From
AIM: The aim of this study was to develop and to validate the self-administered Falun health instrument. An additional aim was to test its applicability in measuring people's lifestyles linked to health. METHODS: In 2002, an instrument was constructed containing questions regarding the hazardous use of alcohol, tobacco, unhealthy diets and insufficient physical activity. A pilot study using the instrument was assessed between 2002 and 2006. In Sweden, it was further expanded and tested during the years 2004-2014 among a total of 1295 people...
October 1, 2017: Scandinavian Journal of Public Health
Petter Frieberg, Pia Sjöberg, Johan Revstedt, Einar Heiberg, Petru Liuba, Marcus Carlsson
PURPOSE: Patients with complex congenital heart disease may need to be converted to a Fontan circulation with systemic venous return surgically connected to the pulmonary circulation. These patients frequently form aortopulmonary collaterals (APC), that is arterial inflows to the pulmonary artery vascular tree. The aim of this study was to develop a method to calculate the effect of APC on the pulmonary flow distribution based on magnetic resonance imaging (MRI) measurements and computational fluid dynamics simulations in order to enable prediction of interventional outcomes in Fontan patients...
August 7, 2017: Clinical Physiology and Functional Imaging
Ameya R Kirtane, Meghan K Rothenberger, Abby Frieberg, Karla Nephew, Nancy Schultz-Darken, Thomas Schmidt, Thomas Reimann, Ashley T Haase, Jayanth Panyam
The human immunodeficiency virus epidemic affects millions of people worldwide. As women are more vulnerable to infection, female-controlled interventions can help control the spread of the disease significantly. Glycerol monolaurate (GML), an inexpensive and safe compound, has been shown to protect against simian immunodeficiency virus infection when applied vaginally. However, on account of its low aqueous solubility, fabrication of high-dose formulations of GML has proven difficult. We describe the development of a vaginal cream that could be loaded with up to 35% GML...
July 2017: Journal of Pharmaceutical Sciences
Bradley R Frieberg, Kirt A Page, Joshua R Graybill, Marlon L Walker, Christopher M Stafford, Gery R Stafford, Christopher L Soles
Perfluorinated ionomers, in particular, Nafion, are a critical component in hydrogen fuel cells as the ion conducting binder within the catalyst layer in which it can be confined to thicknesses on the order of 10 nm or less. It is well reported that many physical properties, such as the Young's modulus, are thickness dependent when the film thickness is less than 100 nm. Here we utilize a cantilever bending methodology to quantify the swelling-induced stresses and relevant mechanical properties of Nafion films as a function of film thickness exposed to cyclic humidity...
December 7, 2016: ACS Applied Materials & Interfaces
David Bilby, Bradley Frieberg, Shobhita Kramadhati, Peter Green, Jinsang Kim
Electrode buffer layers in polymer-based photovoltaic devices enable highly efficient devices. In the absence of buffer layers, we show that diode rectification is lost in ITO/P3HT:PCBM/Ag (ITO = indium tin oxide; P3HT = poly(3-hexylthiophene); PCBM = phenyl C61-butyric acid methyl ester) devices due to nonselective charge injection through the percolated phase pathways of a bulk heterojunction active layer. Charge-selective injection, and thus rectification and device function, can be regained by placing thin, polymeric buffer layers that break the direct electrode-active layer contact...
September 10, 2014: ACS Applied Materials & Interfaces
Olugbenga A Akingbola, Dinesh Singh, Jake A Kleinman, Edwin M Frieberg
No abstract text is available yet for this article.
January 2015: Clinical Pediatrics
Olugbenga A Akingbola, Basil Shar, Dinesh Singh, Edwin Frieberg, Matei Petrescu
Superior ophthalmic vein thrombosis (SOVT) usually results from inflammatory, infectious, or malignant causes. This case describes a 2-year-old boy with severe prolapsing chemosis and proptosis due to thrombosis of the right superior ophthalmic vein resulting from midfacial and right orbital fractures 1 week after the initial trauma. Magnetic resonance imaging and internal carotid artery angiogram are essential in the diagnosis of SOVT. The literature on issues surrounding this case was reviewed with emphasis on the diagnostic evaluation, differential diagnoses, and management of posttraumatic SOVT...
February 2014: Pediatric Emergency Care
Bradley Frieberg, Jenny Kim, Suresh Narayanan, Peter F Green
Diverse processes that include energy conversion, wettability, lubrication, adhesion, and surface-directed phase separation in mixtures fundamentally depend on the structure and dynamics of materials' surfaces and interfaces. We report an unusual phenomenon wherein the surface viscosity of polymer nanocomposites of polystyrene (PS), polyvinyl methyl ether (PVME), and PS-coated gold nanoparticles (PS/PVME/PS-Au) is over an order of magnitude smaller than that of the neat miscible PS/PVME blend. Our X-ray photon correlation spectroscopy studies of the surface dynamics also reveal that the polymer chains manifest dynamics associated with two separate average compositional environments: a PVME-rich region, significantly in excess of its bulk concentration, and a separate PS-rich environment, where the dynamics are approximately 2 orders of magnitude slower...
January 28, 2014: ACS Nano
Maura Steed, Vitor Guerra, Michael R Recto, Song-Gui Yang, Edwin Frieberg, Charles Fox, Thomas Yeh
Traumatic ventricular septal defect is an uncommon complication of blunt chest trauma. We report a case of ventricular septal avulsion, associated with traumatic ventricular septal defect and the associated management concerns.
November 2012: Annals of Thoracic Surgery
Bradley Frieberg, Emmanouil Glynos, Peter F Green
Time-dependent changes of thermodynamic properties due to structural relaxations and physical aging occur in all glasses. We show that the physical aging of thin supported films of star-shaped macromolecules, with f arms of length N_{arm}, exhibits average aging dynamics that are sensitive to f and N_{arm}. Regions of the films in proximity to interfaces age at substantially different rates than the interior of the film; this is also true of linear chain systems. This behavior may be reconciled in terms of a universal picture that accounts only for changes in the local T_{g} of the films...
June 29, 2012: Physical Review Letters
Bingyuan Huang, Emmanouil Glynos, Bradley Frieberg, Hengxi Yang, Peter F Green
Regioregular poly(3-hexylthiophene) (RR-P3HT) is a widely used donor material for bulk heterojunction polymer solar cells. While much is known about the structure and properties of RR-P3HT films, important questions regarding hole mobilities in this material remain unresolved. Measurements of the out-of-plane hole mobilities, μ, of RR-P3HT films have been restricted to films in the thickness regime on the order of micrometers, beyond that generally used in solar cells, where the film thicknesses are typically 100 to 200 nm...
October 24, 2012: ACS Applied Materials & Interfaces
Margot Anderson, Melissa Knudson, Edwin Frieberg, Matei Petrescu, Russell Van Dyke, Ilana Fortgang
No abstract text is available yet for this article.
May 2013: Journal of Pediatric Gastroenterology and Nutrition
Emmanouil Glynos, Bradley Frieberg, Peter F Green
The equilibrium contact angles and line tensions of macroscopic droplets, composed of star-shaped polystyrene (PS) macromolecules, on silicon oxide substrates, are shown to be smaller than their linear analogs, by up to approximately 1 and 2 orders of magnitude, respectively, depending on the size and functionality of the star-shaped molecule. A precursor layer, of lateral dimensions and of thicknesses on the order of nanometers, surrounds each droplet of low molecular weight linear PS chains. Droplets composed of star-shaped molecules possessing a sufficient number of arms, reside on a layer adsorbed to the substrate...
September 9, 2011: Physical Review Letters
Olugbenga Akingbola, Dinesh Singh, Rodney Steiner, Edwin Frieberg, Matei Petrescu
No abstract text is available yet for this article.
November 2012: Clinical Pediatrics
Olugbenga A Akingbola, Dinesh Singh, Sudesh K Srivastav, John W Walsh, David A Jansen, Edwin M Frieberg
BACKGROUND: Craniosynostosis (CSS) results from the premature closure of one or more cranial sutures, leading to deformed calvaria at birth. It is a common finding in children with an incidence of one in 2000 births. Surgery is required in order to release the synostotic constraint and promote normal calvaria growth. Cranial vault remodeling is the surgical approach to CSS repair at our institution and it involves excision of the frontal, parietal, and occipital bones. The purpose of this article is to describe the post-operative course of infants and children admitted to our PICU after undergoing cranial vault remodeling for primary CSS...
2011: BMC Research Notes
Elise Zimmerman, Edwin M Frieberg, Jessica DeBord, Olugbenga Akingbola, Song Gui Yang, Ihor V Yosypiv
No abstract text is available yet for this article.
January 2012: Clinical Pediatrics
Emmanouil Glynos, Bradley Frieberg, Hyunjoon Oh, Ming Liu, David W Gidley, Peter F Green
We show that thin film star-shaped macromolecules exhibit significant differences in their average vitrification behavior, in both magnitude and thickness dependence, from their linear analogs. This behavior is dictated by a combination of their functionality and arm length. Additionally, the glass transition temperature at the free surface of a star-shaped molecule film may be higher than that of the interior, in contrast to their linear analogs where the opposite is true. These findings have implications for other properties, due largely to the origins, entropic, of this behavior...
March 25, 2011: Physical Review Letters
Tamer I Sherief, Brian Mucci, Magdi Greiss
Lisfranc injuries are sometimes easily missed especially if they present in a subtle form. In this study, we have tried to measure the level of accuracy of plain radiographs in detecting this type of injury. We have selected 30 sets of foot radiographs with various diagnoses. Eighteen of them had a Lisfranc type of injury which was confirmed by operative findings or further imaging. These radiographs, together with a small diagnostic questionnaire, were presented to nine senior clinicians. We found that only 11 of the 18 cases (61%) were detected by all the readers...
July 2007: Injury
No abstract text is available yet for this article.
1951: Archiv Für Hygiene und Bakteriologie
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