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https://www.readbyqxmd.com/read/28212282/collagen-gold-nanoparticle-conjugates-for-versatile-biosensing
#1
Sarah Unser, Samuel Holcomb, ReJeana Cary, Laura Sagle
Integration of noble metal nanoparticles with proteins offers promising potential to create a wide variety of biosensors that possess both improved selectivity and versatility. The multitude of functionalities that proteins offer coupled with the unique optical properties of noble metal nanoparticles can allow for the realization of simple, colorimetric sensors for a significantly larger range of targets. Herein, we integrate the structural protein collagen with 10 nm gold nanoparticles to develop a protein-nanoparticle conjugate which possess the functionality of the protein with the desired colorimetric properties of the nanoparticles...
February 15, 2017: Sensors
https://www.readbyqxmd.com/read/28211951/semiparametric-regression-analysis-of-interval-censored-competing-risks-data
#2
Lu Mao, Dan-Yu Lin, Donglin Zeng
Interval-censored competing risks data arise when each study subject may experience an event or failure from one of several causes and the failure time is not observed directly but rather is known to lie in an interval between two examinations. We formulate the effects of possibly time-varying (external) covariates on the cumulative incidence or sub-distribution function of competing risks (i.e., the marginal probability of failure from a specific cause) through a broad class of semiparametric regression models that captures both proportional and non-proportional hazards structures for the sub-distribution...
February 17, 2017: Biometrics
https://www.readbyqxmd.com/read/28211109/conformational-space-of-a-polyphilic-molecule-with-a-fluorophilic-side-chain-integrated-in-a-dppc-bilayer
#3
Guido F von Rudorff, Tobias Watermann, Xiang-Yang Guo, Daniel Sebastiani
We investigate the conformational space of a polyphilic molecule with hydrophilic, lipophilic and fluorophilic parts inserted as a transmembrane agent into a dipalmitoylphosphatidylcholine bilayer by means of all-atom molecular dynamics simulations. Special focus is put on the competing structural driving forces arising from the hydrophilic, lipophilic and fluorophilic side chains and the aromatic backbone of the polyphile. We observe a significant difference between the lipophilic and the fluorophilic side chains regarding their intramembrane distribution...
April 5, 2017: Journal of Computational Chemistry
https://www.readbyqxmd.com/read/28211046/teacher-structure-as-a-predictor-of-students-perceived-competence-and-autonomous-motivation-the-moderating-role-of-differentiated-instruction
#4
Frédéric Guay, Amélie Roy, Pierre Valois
BACKGROUND: An important pedagogical practice is the provision of structure (Farkas & Grolnick, 2010, Motiv. Emot., 34, 266). According to self-determination theory (SDT; Deci & Ryan, 1985, Intrinsic motivation and self-determination in human behavior, Plenum, New York, NY), structure allows students to develop perceived competence in different school subjects, which in turn facilitates the development of autonomous motivation towards these subjects and limits the development of controlled motivation...
February 17, 2017: British Journal of Educational Psychology
https://www.readbyqxmd.com/read/28211013/electrostatic-forces-as-dominant-interactions-between-proteins-and-polyanions-an-esi-ms-study-of-fibroblast-growth-factor-binding-to-heparin-oligomers
#5
Burcu Baykal Minsky, Paul L Dubin, Igor A Kaltashov
The interactions between fibroblast growth factors (FGFs) and their receptors (FGFRs) are facilitated by heparan sulfate (HS) and heparin (Hp), highly sulfated biological polyelectrolytes. The molecular basis of FGF interactions with these polyelectrolytes is highly complex due to the structural heterogeneity of HS/Hp, and many details still remain elusive, especially the significance of charge density and minimal chain length of HS/Hp in growth factor recognition and multimerization. In this work, we use electrospray ionization mass spectrometry (ESI MS) to investigate the association of relatively homogeneous oligoheparins (octamer, dp8, and decamer, dp10) with acidic fibroblast growth factor (FGF-1)...
February 16, 2017: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/28210814/post-mortem-external-examination-competence-education-and-accuracy-of-general-practitioners-in-a-metropolitan-area
#6
Ann Sophie Schröder, Sandra Wilmes, Susanne Sehner, Maren Ehrhardt, Hanna Kaduszkiewicz, Sven Anders
In several countries, general practitioners conduct post-mortem external examination (PMEE) and certify death in out-of-hospital cases. A possible lack of accuracy has been repeatedly criticised, although data on everyday practice of PMEE on outpatients are scarce. To evaluate medical practitioner's competence, education and accuracy regarding PMEE, we conducted a fax-survey among 1343 medical doctors in the metropolitan area of Hamburg, Germany. The results indicate considerable shortcomings in up to 63% regarding the inspection of body orifices and hidden areas, palpation of osseous structures, ectropionisation of the eyelids and use of aids...
February 16, 2017: International Journal of Legal Medicine
https://www.readbyqxmd.com/read/28210493/reducing-the-blame-culture-through-clinical-audit-in-nuclear-medicine-a-mixed-methods-study
#7
P Ross, J Hubert, W L Wong
OBJECTIVES: To identify the barriers and facilitators of doctors' engagement with clinical audit and to explore how and why these factors influenced doctors' decisions to engage with the NHS National Clinical Audit Programme. DESIGN: A single-embedded case study. Mixed methods sequential approach with explorative pilot study and follow-up survey. Pilot study comprised 13 semi-structured interviews with purposefully selected consultant doctors over a six-month period...
February 2017: JRSM Open
https://www.readbyqxmd.com/read/28206672/assessment-of-a-novel-point-of-care-ultrasound-curriculum-s-effect-on-competency-measures-in-family-medicine-graduate-medical-education
#8
Paul Bornemann
OBJECTIVES: Point-of-care ultrasound has been shown to decrease the use of expensive diagnostic studies and improve quality outcome measures. Currently, there is a large desire for training in family medicine residencies, but very few programs have established curricula. We sought to develop a family medicine residency curriculum and evaluate it with tools we developed. We wanted our curriculum to be easy to adopt by other residency programs, even if they did not have many well-trained ultrasound faculty...
February 16, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/28205451/sialylation-of-porphyromonas-gingivalis-lps-and-its-effect-on-bacterial-host-interactions
#9
Svetislav S Zaric, Mark J Lappin, Catherine R Fulton, Fionnuala T Lundy, Wilson A Coulter, Christopher R Irwin
Porphyromonas gingivalis produces different LPS isoforms with significant structural variations of their lipid A and O-antigen moieties that can affect its pro-inflammatory and bone-resorbing potential. We show here, for the first time, that P. gingivalis LPS isolated from W83 strain is highly sialylated and possesses significantly reduced inflammatory potential compared with less sialylated ATCC 33277 strain LPS. Nevertheless, the reduction in the endotoxin activity is not mediated by the presence of sialic acid LPS moieties as the sialic acid-free LPS produced by the mutant W83 strain exhibits a similar inflammatory potential to the wild type strain...
January 1, 2017: Innate Immunity
https://www.readbyqxmd.com/read/28203628/the-structured-interview-for-insight-and-judgment-in-dementia-development-and-validation-of-a-new-instrument-to-assess-awareness-in-patients-with-dementia
#10
Teresa Parrao, Simone Brockman, Romola S Bucks, David G Bruce, Wendy A Davis, Katherine K Hatch, Tammy L Leavy, Christine A P Axten, Sergio E Starkstein
INTRODUCTION: Poor insight about their cognitive and functional deficits is highly prevalent in patients with Alzheimer's disease (AD); however, there is a lack of reliable, valid instrumentation to measure this construct. The aim of this study was to develop and validate a semistructured interview to assess insight and judgment in patients with AD and to provide information regarding the assessment of competency and risk in this population. METHODS: We validated the Structured Clinical Interview for Insight and Judgment in Dementia (SIJID) in a consecutive series of 124 patients with probable AD...
2017: Alzheimer's & Dementia: Diagnosis, Assessment & Disease Monitoring
https://www.readbyqxmd.com/read/28203251/sulfated-glycans-and-related-digestive-enzymes-in-the-zika-virus-infectivity-potential-mechanisms-of-virus-host-interaction-and-perspectives-in-drug-discovery
#11
REVIEW
Vitor H Pomin
As broadly reported, there is an ongoing Zika virus (ZIKV) outbreak in countries of Latin America. Recent findings have demonstrated that ZIKV causes severe defects on the neural development in fetuses in utero and newborns. Very little is known about the molecular mechanisms involved in the ZIKV infectivity. Potential therapeutic agents are also under investigation. In this report, the possible mechanisms of action played by glycosaminoglycans (GAGs) displayed at the surface proteoglycans of host cells, and likely in charge of interactions with surface proteins of the ZIKV, are highlighted...
2017: Interdisciplinary Perspectives on Infectious Diseases
https://www.readbyqxmd.com/read/28202426/integrated-platform-for-home-services-using-new-products-and-services-for-senior-citizens-call-cnav-carsat-2015
#12
Michel Noguès, Daniel Laune, Delphine Paccard, Anne-Laure Coupet, Justine Millot-Keurinck, Narjis Bototo, Marine Bertrand, Jean Bousquet
This project is part of: i) the risks of ageing prevention policy of the French retirement and occupational health insurance agency of Languedoc Roussillon (Carsat-LR) and ii) the European innovation partnership on active and healthy ageing (EIP on AHA). It aims to support senior citizens who live independently and have been identified at risk of frailty on a social or health level. The purpose is to increase legibility as well as technical and financial access to innovations for vulnerable seniors who are remote from the digital era, through a multiservice user-friendly platform...
February 15, 2017: Gériatrie et Psychologie Neuropsychiatrie du Vieillissement
https://www.readbyqxmd.com/read/28201889/role-of-local-and-nonlocal-interactions-in-folding-and-misfolding-of-globular-proteins
#13
Adesh Kumar, Anupaul Baruah, Parbati Biswas
A Monte Carlo simulation based sequence design method is proposed to study the role of the local and the nonlocal interactions with varying secondary structure content in protein folding, misfolding and unfolding. A statistical potential is developed from the compilation of a data set of proteins, which accounts for the respective contribution of local and the nonlocal interactions. Sequences are designed through a combination of positive and negative design by a Monte Carlo simulation in the sequence space...
February 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28199127/development-of-rad-score-a-tool-to-assess-the-procedural-competence-of-diagnostic-radiology-residents
#14
Inga Isupov, Matthew D F McInnes, Stan J Hamstra, Geoffrey Doherty, Ashish Gupta, Susan Peddle, Zaid Jibri, Kawan Rakhra, Rebecca M Hibbert
OBJECTIVE: The purpose of this study is to develop a tool to assess the procedural competence of radiology trainees, with sources of evidence gathered from five categories to support the construct validity of tool: content, response process, internal structure, relations to other variables, and consequences. SUBJECTS AND METHODS: A pilot form for assessing procedural competence among radiology residents, known as the RAD-Score tool, was developed by evaluating published literature and using a modified Delphi procedure involving a group of local content experts...
February 15, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/28196882/trade-offs-between-enzyme-fitness-and-solubility-illuminated-by-deep-mutational-scanning
#15
Justin R Klesmith, John-Paul Bacik, Emily E Wrenbeck, Ryszard Michalczyk, Timothy A Whitehead
Proteins are marginally stable, and an understanding of the sequence determinants for improved protein solubility is highly desired. For enzymes, it is well known that many mutations that increase protein solubility decrease catalytic activity. These competing effects frustrate efforts to design and engineer stable, active enzymes without laborious high-throughput activity screens. To address the trade-off between enzyme solubility and activity, we performed deep mutational scanning using two different screens/selections that purport to gauge protein solubility for two full-length enzymes...
February 14, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28196127/correction-structural-insights-into-streptococcal-competence-regulation-by-the-cell-to-cell-communication-system-comrs
#16
Antoine Talagas, Laetitia Fontaine, Laura Ledesma-García, Johann Mignolet, Inès Li de la Sierra-Gallay, Noureddine Lazar, Magali Aumont-Nicaise, Michael J Federle, Gerd Prehna, Pascal Hols, Sylvie Nessler
[This corrects the article DOI: 10.1371/journal.ppat.1005980.].
February 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28195997/development-and-validation-of-the-cochlear-implant-surgical-competency-assessment-instrument
#17
Thomas Balkany, Kaming Lo, Howard Francis, Simon Angeli, Michael Novak, William Luxford, Rodney Lusk, Heather Strader
OBJECTIVE: We present a new instrument for evaluation of cochlear implant (CI) surgical skills and review its validation process. METHODS: An instrument to assess CI surgical competency incorporated results of structured surveys of comprehensiveness sent to 30 international CI experts and US trainees. One-hundred evaluations of 28 residents, fellows, and practicing CI surgeons were completed. Surgical skills were evaluated by four experienced neurotologists (two raters per subject) using two temporal bones per subject...
February 10, 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/28195316/structural-hierarchy-of-autism-spectrum-disorder-symptoms-an-integrative-framework
#18
Hyunsik Kim, Cara M Keifer, Craig Rodriguez-Seijas, Nicholas R Eaton, Matthew D Lerner, Kenneth D Gadow
BACKGROUND: In an attempt to resolve questions regarding the symptom classification of autism spectrum disorder (ASD), previous research generally aimed to demonstrate superiority of one model over another. Rather than adjudicating which model may be optimal, we propose an alternative approach that integrates competing models using Goldberg's bass-ackwards method, providing a comprehensive understanding of the underlying symptom structure of ASD. METHODS: The study sample comprised 3,825 individuals, consecutive referrals to a university hospital developmental disabilities specialty clinic or a child psychiatry outpatient clinic...
February 14, 2017: Journal of Child Psychology and Psychiatry, and Allied Disciplines
https://www.readbyqxmd.com/read/28194940/dna-duplex-engineering-for-enantioselective-fluorescent-sensor
#19
Yuehua Hu, Fan Lin, Tao Wu, Yufeng Zhou, Qiusha Li, Yong Shao, Zhiai Xu
The rapid identification of biomacromolecule structure that has a specific association with chiral enantiomers especially from natural sources will be helpful in developing enantioselective sensor and in speeding up drug exploitation. Herein, owing to its existence also in living cells, apurinic/apyrimidinic site (AP site) was first engineered into ds-DNA duplex to explore its competence in enantiomer selectivity. An AP site-specific fluorophore was utilized as an enantioselective discrimination probe to develop a straightforward chiral sensor using natural tetrahydropalmatine (L- and D-THP) as enantiomer representatives...
January 30, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28194044/influence-of-mixing-conditions-on-the-rheological-properties-and-structure-of-capillary-suspensions
#20
Frank Bossler, Lydia Weyrauch, Robert Schmidt, Erin Koos
The rheological properties of a suspension can be dramatically altered by adding a small amount of a secondary fluid that is immiscible with the bulk liquid. These capillary suspensions exist either in the pendular state where the secondary fluid preferentially wets the particles or the capillary state where the bulk fluid is preferentially wetting. The yield stress, as well as storage and loss moduli, depends on the size and distribution of secondary phase droplets created during sample preparation. Enhanced droplet breakup leads to stronger sample structures...
April 5, 2017: Colloids and Surfaces. A, Physicochemical and Engineering Aspects
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