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https://www.readbyqxmd.com/read/28701753/modular-approach-for-bimodal-antibacterial-surfaces-combining-photo-switchable-activity-and-sustained-biocidal-release
#1
Piersandro Pallavicini, Barbara Bassi, Giuseppe Chirico, Maddalena Collini, Giacomo Dacarro, Emiliano Fratini, Pietro Grisoli, Maddalena Patrini, Laura Sironi, Angelo Taglietti, Marcel Moritz, Ioritz Sorzabal-Bellido, Arturo Susarrey-Arce, Edward Latter, Alison J Beckett, Ian A Prior, Rasmita Raval, Yuri A Diaz Fernandez
Photo-responsive antibacterial surfaces combining both on-demand photo-switchable activity and sustained biocidal release were prepared using sequential chemical grafting of nano-objects with different geometries and functions. The multi-layered coating developed incorporates a monolayer of near-infrared active silica-coated gold nanostars (GNS) decorated by silver nanoparticles (AgNP). This modular approach also enables us to unravel static and photo-activated contributions to the overall antibacterial performance of the surfaces, demonstrating a remarkable synergy between these two mechanisms...
July 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28694121/quasi-experimental-study-designs-series-paper-1-history-and-introduction
#2
Till Bärnighausen, John-Arne Røttingen, Peter Rockers, Ian Shemilt, Peter Tugwell
OBJECTIVE: To contrast the historical development of experiments and quasi-experiments and provide the motivation for a journal series on quasi-experimental designs in health research STUDY DESIGN: A short historical narrative, with concrete examples, and arguments based on an understanding of the practice of health research and evidence synthesis RESULTS: Health research has played a key role in developing today's gold standard for causal inference - the randomized controlled multiply blinded trial...
July 7, 2017: Journal of Clinical Epidemiology
https://www.readbyqxmd.com/read/28673273/dementia-ascertainment-using-existing-data-in-uk-longitudinal-and-cohort-studies-a-systematic-review-of-methodology
#3
Ruth A Sibbett, Tom C Russ, Ian J Deary, John M Starr
BACKGROUND: Studies investigating the risk factors for or causation of dementia must consider subjects prior to disease onset. To overcome the limitations of prospective studies and self-reported recall of information, the use of existing data is key. This review provides a narrative account of dementia ascertainment methods using sources of existing data. METHODS: The literature search was performed using: MEDLINE, EMBASE, PsychInfo and Web of Science. Included articles reported a UK-based study of dementia in which cases were ascertained using existing data...
July 3, 2017: BMC Psychiatry
https://www.readbyqxmd.com/read/28667184/identification-confirmation-and-replication-of-novel-urinary-microrna-biomarkers-in-lupus-nephritis-and-diabetic-nephropathy
#4
Mariana Cardenas-Gonzalez, Anand Srivastava, Mira Pavkovic, Vanesa Bijol, Helmut G Rennke, Isaac E Stillman, Xiaolan Zhang, Samir Parikh, Brad H Rovin, Maryam Afkarian, Ian H de Boer, Jonathan Himmelfarb, Sushrut S Waikar, Vishal S Vaidya
BACKGROUND: The prevalence of chronic kidney disease (CKD) is increasing, leading to significant morbidity and mortality. Kidney biopsy remains the gold standard for diagnosing the underlying etiology of CKD, but the procedure carries complication risks. The aim of this study was to identify novel noninvasive biomarkers correlating with kidney function and histopathology in biopsy-proven CKD patients. METHODS: We profiled 2402 urinary microRNAs (miRNAs) to identify and confirm differentially expressed miRNAs associated with kidney function and histopathology in patients with diabetic nephropathy (n = 58) or lupus nephritis (n = 89), important etiologies of CKD, compared with healthy controls (n = 93 and 119, respectively)...
June 30, 2017: Clinical Chemistry
https://www.readbyqxmd.com/read/28616407/peroral-endoscopic-myotomy-poem-for-treating-esophageal-motility-disorders
#5
REVIEW
Ian Wong, Simon Law
Pneumatic dilatation and Heller myotomy have been thoroughly studied as the most viable treatment options for achalasia. The pendulum, however, is shifting to the minimally invasive approach. Since Inoue et al. published the experience of the first 17 cases of peroral endoscopic myotomy (POEM) in 2010, there have been at least 5,000 cases performed worldwide and the number is increasing exponentially. Experts across the globe have been extending the indications to various esophageal motility disorders, to patients of extremes of age, sigmoidal esophagus and re-operated patients...
April 2017: Annals of Translational Medicine
https://www.readbyqxmd.com/read/28584661/evaluation-of-sexual-and-fertility-dysfunction-in-spinal-cord-injured-men-in-jamaica
#6
Belinda F Morrison, Ian White-Gittens, Simon Smith, Shari St John, Romar Bent, Rory Dixon
INTRODUCTION: Sexual dysfunction and infertility are common in males with traumatic spinal cord injuries (SCIs). The objective of this study was to determine the prevalence of sexual dysfunction and infertility in males with traumatic SCI managed in Jamaica, as well as the therapeutic options offered. CASE PRESENTATION: A cross-sectional study including males with traumatic SCI managed at the Sir John Golding Rehabilitation Centre, Kingston, Jamaica was carried out between 1 January and 31 December 2015...
2017: Spinal Cord Series and Cases
https://www.readbyqxmd.com/read/28554919/validation-of-asthma-recording-in-electronic-health-records-protocol-for-a-systematic-review
#7
Francis Nissen, Jennifer K Quint, Samantha Wilkinson, Hana Mullerova, Liam Smeeth, Ian J Douglas
BACKGROUND: Asthma is a common, heterogeneous disease with significant morbidity and mortality worldwide. It can be difficult to define in epidemiological studies using electronic health records as the diagnosis is based on non-specific respiratory symptoms and spirometry, neither of which are routinely registered. Electronic health records can nonetheless be valuable to study the epidemiology, management, healthcare use and control of asthma. For health databases to be useful sources of information, asthma diagnoses should ideally be validated...
May 29, 2017: BMJ Open
https://www.readbyqxmd.com/read/28535675/novel-liposome-based-surface-enhanced-raman-spectroscopy-sers-substrate
#8
William Lum, Ian Bruzas, Zohre Gorunmez, Sarah Unser, Thomas Beck, Laura Sagle
Although great strides have been made in recent years toward making highly enhancing surface-enhanced Raman spectroscopy (SERS) substrates, the biological compatibility of such substrates remains a crucial problem. To address this issue, liposome-based SERS substrates have been constructed in which the biological probe molecule is encapsulated inside the aqueous liposome compartment, and metallic elements are assembled using the liposome as a scaffold. Therefore, the probe molecule is not in contact with the metallic surfaces...
June 15, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28455279/engaging-patients-and-caregivers-managing-rare-diseases-to-improve-the-methods-of-clinical-guideline-development-a-research-protocol
#9
Dmitry Khodyakov, Kathi Kinnett, Sean Grant, Ann Lucas, Ann Martin, Brian Denger, Holly Peay, Ian Coulter, Arlene Fink
BACKGROUND: Clinical guidelines provide systematically developed recommendations for deciding on appropriate health care options for specific conditions and clinical circumstances. Up until recently, patients and caregivers have rarely been included in the process of developing care guidelines. OBJECTIVE: This project will develop and test a new online method for including patients and their caregivers in this process using Duchenne muscular dystrophy (DMD) care guidelines as an example...
April 28, 2017: JMIR Research Protocols
https://www.readbyqxmd.com/read/28447703/conserved-effects-and-altered-trafficking-of-cetuximab-antibodies-conjugated-to-gold-nanoparticles-with-precise-control-of-their-number-and-orientation
#10
Lorena García-Fernández, Javier Garcia-Pardo, Olivia Tort, Ian Prior, Mathias Brust, Eudald Casals, Julia Lorenzo, Victor F Puntes
Gold nanoparticles (17 nm) have been functionalized with the antiangiogenic monoclonal antibody drug Cetuximab at a well-defined orientation and coverage density of antibodies. Functionalization has been carried out through site-directed chemistry via the selective oxidation of the carbohydrate moiety of antibodies linked to a thiolated hydrazide. A431 tumor cells have been exposed to these conjugates for in vitro evaluation of their effects. In addition to epithelial growth factor receptor blocking, trafficking and signaling alterations were also observed...
May 11, 2017: Nanoscale
https://www.readbyqxmd.com/read/28447459/fast-torsional-artificial-muscles-from-niti-twisted-yarns
#11
Seyed M Mirvakili, Ian W Hunter
Torsional artificial muscles made of multiwalled carbon nanotube/niobium nanowire yarns have shown remarkable torsional speed and gravimetric torque. The muscle structure consists of a twisted yarn with half of its length infiltrated with a stimuli-responsive guest material such as paraffin wax. The volumetric expansion of the guest material creates the torsional actuation in the yarn. In the present work, we show that this type of actuation is not unique to wax-infiltrated carbon multiwalled nanotube (MWCNT) or niobium nanowire yarns and that twisted yarn of NiTi alloy fibers also produces fast torsional actuation...
May 2, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28434640/imaging-guidance-for-transcatheter-aortic-valve-replacement-is-transoesophageal-echocardiography-the-gold-standard
#12
REVIEW
Bo Xu, Philip M Mottram, Siobhan Lockwood, Ian T Meredith
Transcatheter aortic valve replacement (TAVR) is traditionally performed under cardiac imaging guidance. In the early TAVR experience, intra-procedural transoesophageal echocardiography (TOE) is recommended to guide device deployment, in the context of general anaesthesia (GA). Intra-procedural TOE imaging is particularly useful during TAVR deployment as a contrast-saving strategy for patients with renal impairment. Evidence has emerged recently demonstrating that in selected patients, transthoracic echocardiography (TTE) can be used to provide intra-procedural guidance for TAVR...
March 27, 2017: Heart, Lung & Circulation
https://www.readbyqxmd.com/read/28426059/evolution-of-dealloying-induced-strain-in-nanoporous-gold-crystals
#13
Yu-Chen Karen Chen-Wiegart, Ross Harder, David C Dunand, Ian McNulty
We studied the evolution of dealloying-induced strain along the {111} in a Ag-Au nano-crystal in situ, during formation of nanoporous gold at the initial stage of dealloying using Bragg coherent X-ray diffractive imaging. The strain magnitude with maximum probability in the crystal doubled in 10 s of dealloying. Although formation of nano-pores just began at the surface, the greatest strain is located 60-80 nm deep within the crystal. Dealloying induced a compressive strain in this region, indicating volume shrinkage occurred during pore formation...
May 4, 2017: Nanoscale
https://www.readbyqxmd.com/read/28412526/birth-setting-labour-experience-and-postpartum-psychological-distress
#14
Anna L MacKinnon, Lisa Yang, Nancy Feeley, Ian Gold, Barbara Hayton, Phyllis Zelkowitz
OBJECTIVE: although psychosocial risk factors have been identified for postpartum depression (PPD) and perinatal posttraumatic stress disorder (PTSD), the role of labour- and birth-related factors remains unclear. The present investigation explored the impact of birth setting, subjective childbirth experience, and their interplay, on PPD and postpartum PTSD. METHOD: in this prospective longitudinal cohort study, three groups of women who had vaginal births at a tertiary care hospital, a birthing center, and those transferred from the birthing centre to the tertiary care hospital were compared...
March 31, 2017: Midwifery
https://www.readbyqxmd.com/read/28406898/spatial-relationship-between-taenia-solium-tapeworm-carriers-and-necropsy-cyst-burden-in-pigs
#15
Ian W Pray, Viterbo Ayvar, Ricardo Gamboa, Claudio Muro, Luz M Moyano, Victor Benavides, Robert H Flecker, Hector H Garcia, Seth E O'Neal
BACKGROUND: Taenia solium, a parasite that affects humans and pigs, is the leading cause of preventable epilepsy in the developing world. Geographic hotspots of pigs testing positive for serologic markers of T. solium exposure have been observed surrounding the locations of human tapeworm carriers. This clustered pattern of seropositivity in endemic areas formed the basis for geographically targeted control interventions, which have been effective at reducing transmission. In this study, we further explore the spatial relationship between human tapeworm carriers and infected pigs using necroscopic examination as a quantitative gold-standard diagnostic to detect viable T...
April 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28383028/3d-lattice-distortions-and-defect-structures-in-ion-implanted-nano-crystals
#16
Felix Hofmann, Edmund Tarleton, Ross J Harder, Nicholas W Phillips, Pui-Wai Ma, Jesse N Clark, Ian K Robinson, Brian Abbey, Wenjun Liu, Christian E Beck
Focussed Ion Beam (FIB) milling is a mainstay of nano-scale machining. By manipulating a tightly focussed beam of energetic ions, often gallium (Ga(+)), FIB can sculpt nanostructures via localised sputtering. This ability to cut solid matter on the nano-scale revolutionised sample preparation across the life, earth and materials sciences. Despite its widespread usage, detailed understanding of the FIB-induced structural damage, intrinsic to the technique, remains elusive. Here we examine the defects caused by FIB in initially pristine objects...
April 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28362079/role-of-defects-and-surface-states-in-the-carrier-transport-and-nonlinearity-of-the-diode-characteristics-in-pbs-zno-quantum-dot-solar-cells
#17
Y Cheng, M C D Whitaker, R Makkia, S Cocklin, V R Whiteside, L A Bumm, E Adcock-Smith, K P Roberts, P Hari, I R Sellers
The roles of bulk surface states and interfacial defects are probed experimentally using a combination of current-voltage, capacitance-voltage, and impedance measurements. The critical importance of the quality of both the film and interfaces is evident in current-voltage measurements where shunting and interface states result in large dark currents and the subsequent loss of Jsc. These properties are shown to be critically related to the nature and role of the PbS QD interface with the (nominally) ohmic gold contact...
April 7, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28283744/serial-block-face-scanning-electron-microscopy-applied-to-study-the-trafficking-of-8d3-coated-gold-nanoparticles-at-the-blood-brain-barrier
#18
Itsaso Cabezón, Elisabet Augé, Manel Bosch, Alison J Beckett, Ian A Prior, Carme Pelegrí, Jordi Vilaplana
Due to the physical and physiological properties of the blood-brain barrier (BBB), the transport of neurotherapeutics from blood to brain is still a pharmaceutical challenge. We previously conducted a series of experiments to explore the potential of the anti-transferrin receptor 8D3 monoclonal antibody (mAb) to transport neurotherapeutics across the BBB. In that study, gold nanoparticles (AuNPs) were coated with the 8D3 antibody and administered intravenously to mice. Transmission electron microscopy was used and a two-dimensional (2D) image analysis was performed to detect the AuNPs in the brain capillary endothelial cells (BCECs) and brain parenchyma...
March 10, 2017: Histochemistry and Cell Biology
https://www.readbyqxmd.com/read/28278337/a-proposal-to-redefine-close-surgical-margins-in-squamous-cell-carcinoma-of-the-oral-tongue
#19
Daniella Karassawa Zanoni, Jocelyn C Migliacci, Bin Xu, Nora Katabi, Pablo H Montero, Ian Ganly, Jatin P Shah, Richard J Wong, Ronald A Ghossein, Snehal G Patel
Importance: Resection of the primary tumor with negative margins is the gold standard treatment for squamous cell carcinoma of the oral tongue (SCCOT). A microscopically positive surgical margin is clearly associated with a higher risk for local recurrence, whereas a negative margin has traditionally been defined as greater than 5.0 mm clearance from the tumor, with lesser margins arbitrarily designated as close. The precise cutoff at which the risk for local recurrence with a close margin approximates that of a microscopically positive margin remains unclear...
June 1, 2017: JAMA Otolaryngology—Head & Neck Surgery
https://www.readbyqxmd.com/read/28268924/modeling-of-pharyngoesophageal-segment-during-tracheoesophageal-phonation-in-total-laryngectomy-patients-with-preliminary-validation
#20
Teng Zhang, Siwei Bai, Ian Cook, Michal Szczesniak, Julia Maclean, Socrates Dokos
For patients with large or recurrent laryngeal cancer, total laryngectomy surgery is usually performed. In the absence of a larynx, tracheoesophageal (TE) voice is the gold standard for alaryngeal phonation. The mechanisms underlying TE voice are unknown, but pharyngoesophageal (PE) segment vibration has been shown to play a key role. The aim of this study was to systematically explore the mechanics of PE segment vibration during TE phonation. A 2D axisymmetric finite-element model with two domains representing the air and PE wall was developed...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
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