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https://www.readbyqxmd.com/read/28429766/beyond-growth-signaling-paneth-cells-metabolically-suppport-iscs
#1
Talya L Dayton, Hans Clevers
Single Lgr5 intestinal stem cells (ISCs) can be expanded in vitro into epithelial organoids or "mini-guts", self-organizing cellular structures that recreate the intestinal differentiation program; Paneth cells, which constitute the intestinal stem cell niche, secrete stem cell growth signals, and are thus essential for this process. In a recent paper published in Nature, Rodríguez-Colman et al. describe how Paneth cells may be supporting the metabolic state of ISCs.
April 21, 2017: Cell Research
https://www.readbyqxmd.com/read/28429136/is-there-an-alternative-treatment-for-patients-intolerant-to-antiplatelet-therapy-if-percutaneous-left-atrial-appendage-closure-is-considered
#2
F Akca, N J Verberkmoes, S E Verstraeten, C van Laar, B P van Putte, A H M van Straten
INTRODUCTION: Left atrial appendage (LAA) closure has become of major interest for patients with atrial fibrillation intolerant to oral anticoagulation therapy (OAC). Patients with a contraindication to both OAC and antiplatelet therapy are not eligible for percutaneous LAA closure. We aimed to find an alternative treatment for these specific patients. METHODS: From March 2014 until December 2015 five patients were referred for percutaneous LAA closure. Alternative treatment was necessary due to an absolute contraindication to OAC and antiplatelet therapy (n = 4) or after previous failed percutaneous device implantation (n = 1)...
April 20, 2017: Netherlands Heart Journal
https://www.readbyqxmd.com/read/28425621/p53-competent-cells-and-p53-deficient-cells-display-different-susceptibility-to-oxygen-functionalized-graphene-cytotoxicity-and-genotoxicity
#3
Dayton M Petibone, Thikra Mustafa, Shawn E Bourdo, Andersen Lafont, Wei Ding, Alokita Karmakar, Zeid A Nima, Fumiya Watanabe, Daniel Casciano, Suzanne M Morris, Vasily N Dobrovolsky, Alexandru S Biris
Due to the distinctive physical, electrical, and chemical properties of graphene nanomaterials, numerous efforts pursuing graphene-based biomedical and industrial applications are underway. Oxidation of pristine graphene surfaces mitigates its otherwise hydrophobic characteristic thereby improving its biocompatibility and functionality. Yet, the potential widespread use of oxidized graphene derivatives raises concern about adverse impacts on human health. The p53 tumor suppressor protein maintains cellular and genetic stability after toxic exposures...
April 20, 2017: Journal of Applied Toxicology: JAT
https://www.readbyqxmd.com/read/28416968/safety-and-efficacy-of-resistive-polymer-versus-forced-air-warming-in-total-joint-surgery
#4
Melanie F Sandoval, Paul D Mongan, Michael R Dayton, Craig A Hogan
BACKGROUND: Forced-air warming is used as a mechanism to prevent hypothermia and adverse outcomes associated with hypothermia among patients undergoing surgery. Patient safety in healthcare includes the use of devices and technology that minimize potential adverse events to patients. The present study sought to compare the capabilities of patient warming between two different devices that use different mechanisms of warming: forced-air warming and non-air warming. METHODS: One hundred twenty patients undergoing total hip or total knee arthroplasty received patient warming via a forced warming device or non-air warming fabric conductive material...
2017: Patient Safety in Surgery
https://www.readbyqxmd.com/read/28401845/parent-child-intervention-decreases-stress-and-increases-maternal-brain-activity-and-connectivity-during-own-baby-cry-an-exploratory-study
#5
James E Swain, S Shaun Ho, Katherine L Rosenblum, Diana Morelen, Carolyn J Dayton, Maria Muzik
Parental responses to their children are crucially influenced by stress. However, brain-based mechanistic understanding of the adverse effects of parenting stress and benefits of therapeutic interventions is lacking. We studied maternal brain responses to salient child signals as a function of Mom Power (MP), an attachment-based parenting intervention established to decrease maternal distress. Twenty-nine mothers underwent two functional magnetic resonance imaging brain scans during a baby-cry task designed to solicit maternal responses to child's or self's distress signals...
May 2017: Development and Psychopathology
https://www.readbyqxmd.com/read/28397917/charles-j-pedersen-s-legacy-to-chemistry
#6
Reed M Izatt
The serendipitous discovery in 1961 of dibenzo-18-crown-6 by Charles J. Pedersen marked the beginning of research on cyclic polyether macrocyclic compounds. These compounds have a remarkably selective affinity for certain metal ions and provide a framework for studying molecular recognition processes. Pedersen's work excited much interest in the scientific community and fueled important advances in macrocyclic and supramolecular chemistry. Born in Korea of a Japanese mother and a Norwegian engineer father, he was educated in Japan and later graduated from the University of Dayton (BS, chemical engineering) and Massachusetts Institute of Technology (MS, chemistry)...
April 11, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28338814/korean-pediatric-and-adult-head-computational-phantoms-and-application-to-photon-specific-absorbed-fractions-calculations
#7
Daphnée Villoing, Dayton McMillan, Kwang Pyo Kim, Il Park, Ae-Kyoung Lee, Hyung-do Choi, Choonsik Lee
In recent decades, applications of single photon emission computed tomography and positron emission tomography in clinical neuroimaging have markedly increased. In this study, we developed a series of Korean computational head phantoms with detailed cranial substructures for 6-, 9-, 12- and 15-year-old children and adult by non-uniformly adjusting a template head phantom to match the Korean standard head dimensions. The Korean head phantoms were coupled with a Monte Carlo transport code to calculate age-dependent specific absorbed fraction (SAF) for the combination of 10 source and target regions and mono-energetic photons ranging from 0...
February 23, 2017: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/28333964/optimizing-ultrasound-molecular-imaging-of-secreted-frizzled-related-protein-2-expression-in-angiosarcoma
#8
James K Tsuruta, Nicholas P Schaub, Juan D Rojas, Jason Streeter, Nancy Klauber-DeMore, Paul Dayton
Secreted frizzled related protein 2 (SFRP2) is a tumor endothelial marker expressed in angiosarcoma. Previously, we showed ultrasound molecular imaging with SFRP2-targeted contrast increased average video pixel intensity (VI) of angiosarcoma vessels by 2.2 ± 0.6 VI versus streptavidin contrast. We hypothesized that redesigning our contrast agents would increase imaging performance. Improved molecular imaging reagents were created by combining NeutrAvidin™-functionalized microbubbles with biotinylated SFRP2 or IgY control antibodies...
2017: PloS One
https://www.readbyqxmd.com/read/28329461/cardiac-function-after-tetralogy-of-fallot-complete-atrioventricular-canal-repair
#9
Elizabeth H Stephens, Jennifer Tingo, Marc Najjar, Betul Yilmaz, Stéphanie Levasseur, Jeffrey D Dayton, Ralph S Mosca, Paul Chai, Jan M Quaegebeur, Emile A Bacha
BACKGROUND: Repair of complete atrioventricular canal (CAVC) with tetralogy of Fallot (TOF) is a challenging operation increasingly being performed as a complete, primary repair in infancy. Previous studies have focused on perioperative outcomes; however, midterm valve function, ventricular function, and residual obstruction have received little attention. METHODS: We retrospectively reviewed 20 patients who underwent CAVC/TOF repair (January 2005 to December 2014)...
March 2017: World Journal for Pediatric & Congenital Heart Surgery
https://www.readbyqxmd.com/read/28325048/photoinduced-single-and-multiple-electron-dynamics-processes-enhanced-by-quantum-confinement-in-lead-halide-perovskite-quantum-dots
#10
Dayton Jon Vogel, Andrei Kryjevski, Talgat M Inerbaev, Dmitri S Kilin
Methyl-ammonium lead iodide perovskite (MAPbI3) is a promising material for photovoltaic devices. A modification of the MAPbI3 into confined nanostructures is expected to further increase efficiency of solar energy conversion. Photo-excited dynamic processes in a MAPbI3 quantum dot (QD) have been modeled by many-body perturbation theory and nonadiabatic dynamics. A photoexcitation is followed by either exciton cooling (EC), its radiative (RR) or non-radiative recombination (NRR), or multi-exciton generation (MEG) processes...
March 21, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28266925/an-iterative-fullwave-simulation-approach-to-multiple-scattering-in-media-with-randomly-distributed-microbubbles
#11
Aditya Joshi, Brooks Lindsey, Paul Dayton, Gianmarco Pinton, Marie Muller
- Ultrasound contrast agents (UCA), such as microbubbles, enhance the scattering properties of blood, which is otherwise hypoechoic. The multiple scattering interactions of the acoustic field with UCA's are poorly understood due to the complexity of the multiple scattering theories and the nonlinear microbubble response. The majority of bubble models describe the behavior of UCA's as single, isolated microbubbles suspended in infinite medium. Multiple scattering models such as the Independent Scattering Approximation can approximate phase velocity and attenuation for low scatterer volume fraction...
March 7, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28257681/the-essential-achilles
#12
EDITORIAL
Paul Dayton
No abstract text is available yet for this article.
April 2017: Clinics in Podiatric Medicine and Surgery
https://www.readbyqxmd.com/read/28257668/anatomic-vascular-and-mechanical-overview-of-the-achilles-tendon
#13
REVIEW
Paul Dayton
The Achilles tendon is the strongest and thickest tendon in the body and is subjected to unique forces during the activities of living. A variety of pathologic processes have been identified causing clinical symptoms in patients of all ages. A detailed understanding of Achilles anatomy is necessary to understand the pathologic process that are seen in the tendon. As with all medical topics and conditions, our understanding is evolving as new research sheds light on pathologic processes involved with the Achilles tendon...
April 2017: Clinics in Podiatric Medicine and Surgery
https://www.readbyqxmd.com/read/28201790/reaching-the-global-target-to-reduce-stunting-an-investment-framework
#14
Meera Shekar, Jakub Kakietek, Mary R D'Alimonte, Hilary E Rogers, Julia Dayton Eberwein, Jon Kweku Akuoku, Audrey Pereira, Shan Soe-Lin, Robert Hecht
No abstract text is available yet for this article.
February 14, 2017: Health Policy and Planning
https://www.readbyqxmd.com/read/28127427/an-evaluation-of-the-sonoporation-potential-of-low-boiling-point-phase-change-ultrasound-contrast-agents-in-vitro
#15
Samantha M Fix, Anthony Novell, Yeoheung Yun, Paul A Dayton, Christopher B Arena
BACKGROUND: Phase-change ultrasound contrast agents (PCCAs) offer a solution to the inherent limitations associated with using microbubbles for sonoporation; they are characterized by prolonged circulation lifetimes, and their nanometer-scale sizes may allow for passive accumulation in solid tumors. As a first step towards the goal of extravascular cell permeabilization, we aim to characterize the sonoporation potential of a low-boiling point formulation of PCCAs in vitro. METHODS: Parameters to induce acoustic droplet vaporization and subsequent microbubble cavitation were optimized in vitro using high-speed optical microscopy...
2017: Journal of Therapeutic Ultrasound
https://www.readbyqxmd.com/read/28126110/a-comparison-of-network-sampling-designs-for-a-hidden-population-of-drug-users-random-walk-vs-respondent-driven-sampling
#16
David C Bell, Elizabeth B Erbaugh, Tabitha Serrano, Cheryl A Dayton-Shotts, Isaac D Montoya
Both random walk and respondent-driven sampling (RDS) exploit social networks and may reduce biases introduced by earlier methods for sampling from hidden populations. Although RDS has become much more widely used by social researchers than random walk (RW), there has been little discussion of the tradeoffs in choosing RDS over RW. This paper compares experiences of implementing RW and RDS to recruit drug users to a network-based study in Houston, Texas. Both recruitment methods were implemented over comparable periods of time, with the same population, by the same research staff...
February 2017: Social Science Research
https://www.readbyqxmd.com/read/28118939/endonasal-septal-perforation-repair-using-posterior-and-inferiorly-based-mucosal-rotation-flaps
#17
Steven Dayton, Nipun Chhabra, Steven Houser
IMPORTANCE: Repair of nasal septal perforations is challenging regardless of surgical technique due to their location and the health of surrounding tissue. There is currently no surgical procedure which is completely effective in the treatment of anteriorly located perforations. OBJECTIVE: To report a novel method of closing anterior septal perforations using an inferiorly based mucosal rotation flap and an acellular dermal interposition graft, as well as expand upon a previous series...
March 2017: American Journal of Otolaryngology
https://www.readbyqxmd.com/read/28113395/optimizing-acoustic-activation-of-phase-change-contrast-agents-with-the-activation-pressure-matching-method-a-review
#18
Juan D Rojas, Paul A Dayton
Sub-micron phase-change contrast agents consist of a liquid perfluorocarbon core that can be vaporized by ultrasound (acoustic droplet vaporization) to generate contrast with excellent spatial and temporal control. When these agents, commonly referred to as nanodroplets, are formulated with cores of low boiling-point perfluorocarbons such as decafluorobutane and octafluoropropane, they can be activated with lowmechanical index imaging pulses for diagnostic applications. Since the utilization of minimum mechanical index is often desirable to avoid unnecessary biological effects, enabling consistent activation of these agents in an acoustic field is a challenge because the energy that must be delivered to achieve the vaporization threshold increases with depth due to attenuation...
October 12, 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28108472/relapsed-acute-promyelocytic-leukemia-lacks-classic-leukemic-promyelocyte-morphology-and-can-create-diagnostic-challenges
#19
Vanessa J Dayton, Robert W McKenna, Sophia L Yohe, Michelle M Dolan, Elizabeth Courville, Harold Alvarez, Michael A Linden
Objectives: Although current therapies for acute promyelocytic leukemia (APL), such as all- trans retinoic acid and arsenic trioxide, usually result in remission, some patients relapse. Early recognition of relapse is critical for prompt intervention. In this study, we systematically reviewed morphologic, immunophenotypic, and cytogenetic findings in paired diagnostic and relapsed APL cases and describe and quantify the changes in blast morphology at relapse. Methods: By electronic database search, we identified eight paired diagnostic and relapsed APL cases for which peripheral blood or bone marrow smears were available for review...
January 1, 2017: American Journal of Clinical Pathology
https://www.readbyqxmd.com/read/28076378/p62-pathology-model-in-the-rat-substantia-nigra-with-filamentous-inclusions-and-progressive-neurodegeneration
#20
Kasey L Jackson, Wen-Lang Lin, Sumitra Miriyala, Robert D Dayton, Manikandan Panchatcharam, Kevin J McCarthy, Monica Castanedes-Casey, Dennis W Dickson, Ronald L Klein
One of the proteins most frequently found in neuropathological lesions is the ubiquitin binding protein p62 (sequestosome 1). Post-mortem analysis of p62 is a defining diagnostic marker in several neurodegenerative diseases including amyotrophic lateral sclerosis and inclusion body myositis. Since p62 functions in protein degradation pathways including autophagy, the build-up of p62-positive inclusions suggests defects in protein clearance. p62 was expressed unilaterally in the rat substantia nigra with an adeno-associated virus vector (AAV9) in order to study p62 neuropathology...
2017: PloS One
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