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https://www.readbyqxmd.com/read/28820469/a-third-generation-glucose-biosensor-based-on-cellobiose-dehydrogenase-immobilized-on-a-glassy-carbon-electrode-decorated-with-electrodeposited-gold-nanoparticles-characterization-and-application-in-human-saliva
#1
Paolo Bollella, Lo Gorton, Roland Ludwig, Riccarda Antiochia
Efficient direct electron transfer (DET) between a cellobiose dehydrogenase mutant from Corynascus thermophilus (CtCDH C291Y) and a novel glassy carbon (GC)-modified electrode, obtained by direct electrodeposition of gold nanoparticles (AuNPs) was realized. The electrode was further modified with a mixed self-assembled monolayer of 4-aminothiophenol (4-APh) and 4-mercaptobenzoic acid (4-MBA), by using glutaraldehyde (GA) as cross-linking agent. The CtCDH C291Y/GA/4-APh,4-MBA/AuNPs/GC platform showed an apparent heterogeneous electron transfer rate constant (ks) of 19...
August 18, 2017: Sensors
https://www.readbyqxmd.com/read/28819188/highly-stabilized-core-satellite-gold-nanoassemblies-in-vivo-dna-directed-self-assembly-peg-modification-and-cell-imaging
#2
Liangfeng Tang, Guiping Yu, Lishan Tan, Min Li, Xiulong Deng, Jianyu Liu, Aiqing Li, Xuandi Lai, Jianqiang Hu
Au nanoparticles (NPs) have important applications in bioimaging, clinical diagnosis and even therapy due to its water-solubility, easy modification and drug-loaded capability, however, easy aggregation of Au NPs in normal saline and serum greatly limits its applications. In this work, highly stabilized core-satellite Au nanoassemblies (CSAuNAs) were constructed by a hierarchical DNA-directed self-assembly strategy, in which satellite Au NPs number could be effectively tuned through varying the ratios of core-AuNPs-ssDNA and satellite-AuNPs-ssDNAc...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28818852/accuracy-of-11-formulae-to-guide-umbilical-arterial-catheter-tip-placement-in-newborn-infants
#3
Wei Ling Lean, Jennifer A Dawson, Peter G Davis, Christiane Theda, Marta Thio
BACKGROUND: Umbilical arterial catheter (UAC) insertion is a common procedure in the neonatal intensive care unit (NICU). Correct placement of the tip of the UAC at first attempt minimises handling of the infant and reduces the risk of infection and complications. We aimed to determine the accuracy of 11 published formulae to guide UAC placement. METHODS: This was a one-year prospective observational study in a tertiary NICU. Clinicians used their preferred formula for UAC insertion, with X-rays performed immediately post-procedure to check the tip position...
August 17, 2017: Archives of Disease in Childhood. Fetal and Neonatal Edition
https://www.readbyqxmd.com/read/28817942/-the-current-status-of-diagnostic-tools-for-leptospirosis
#4
Mitsumasa Saito, Yasuhiko Nikaido, Masahiro Matsumoto, Midori Ogawa, Sharon Y A M Villanueva
Leptospirosis is a worldwide zoonosis caused by pathogenic Leptospira spp. The severity of leptospirosis vary from mild, flu-like disease to a more severe form, Weil's disease causing jaundice, hemorrhage, renal failure, and even death. Every year, 300,000‒500,000 cases of severe leptospirosis are reported around the world, with the case fatality rate being 10‒30%. The usual diagnostic tools for leptospirosis are 1) direct observation of leptospires in blood and urine under dark-field microscope, 2) isolation of leptospires from blood, cerebrospinal fluid (CSF), or urine samples by culture, 3) microscopic agglutination test (MAT) to detect anti-Leptospira antibodies in serum, and 4) PCR to detect Leptospira DNA...
August 15, 2017: JARMAM: Journal of the Association for Rapid Method and Automation in Microbiology
https://www.readbyqxmd.com/read/28815986/modulatory-functionalization-of-gold-nanorods-using-supramolecular-assemblies
#5
Sundo Jeong, Hongrual Park, Dongmin Seon, Jongwan Choi, Ki Bum Hong, Jiseok Lee, Chaekyu Kim, Jung-Keun Kim, Myoung-Hwan Park
Supramolecular assembly-mediated functionalization of gold nanorods (GNRs) has been developed by reversible phase transfer between water and oils, which offers a facile method for fabricating stubborn GNRs with surface charge tunability. In this regard, TMA-GNRs were initially prepared from conventional CTAB-GNRs via a ligand exchange reaction in the presence of excess of TMA ligands. To further expand their functionality and potential applications, electrostatic assemblies of positively charged TMA-GNRs with negatively charged oleate ions were prepared...
August 17, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28815958/arabidopsis-exo70a1-recruits-patellin3-to-the-cell-membrane-independent-of-its-role-as-exocyst-subunit
#6
Chengyun Wu, Lu Tan, Max van Hooren, Xiaoyun Tan, Feng Liu, Yan Li, Yanxue Zhao, Bingxuan Li, Qingchen Rui, Teun Munnik, Yiqun Bao
The exocyst is a well-known complex to tether vesicles at the cell membrane before fusion. Whether an individual subunit can execute a unique function is largely unknown. Using yeast-two-hybrid (Y2H) analysis, we found that EXO70A1 interacted with the GOLD domain of Patellin3 (PATL3). The direct EXO70A1-PATL3 interaction was supported by in vitro and in vivo experiments. In Arabidopsis, PATL3-GFP colocalized with EXO70A1 predominantly at the cell membrane, and PATL3 localization was insensitive to BFA and TryA23...
August 16, 2017: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/28815272/gold-nanoparticle-based-localized-surface-plasmon-immunosensor-for-staphylococcal-enterotoxin-a-sea-detection
#7
Maroua Ben Haddada, David Hu, Michèle Salmain, Lu Zhang, Chen Peng, Yi Wang, Bo Liedberg, Souhir Boujday
We describe the engineering of stable gold nanoparticle (AuNP) bioconjugates for the detection of staphylococcal enterotoxin A (SEA) using localized surface plasmon resonance (LSPR). Two types of AuNP bioconjugates were prepared by covalently attaching anti-SEA antibody (Ab) or SEA to AuNPs. This was achieved by reacting Traut's reagent with lysine residues of both proteins to generate thiol groups that bind to gold atoms on the AuNP surface. These bioconjugates were characterized in-depth by absorption spectroscopy, cryo-transmission electron microscopy, dynamic light scattering, and zeta potential measurements...
August 16, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28815162/clinical-application-of-ceramics-in-anterior-cervical-discectomy-and-fusion-a-review-and-update
#8
REVIEW
Shayan Abdollah Zadegan, Aidin Abedi, Seyed Behnam Jazayeri, Hirbod Nasiri Bonaki, Alexander R Vaccaro, Vafa Rahimi-Movaghar
STUDY DESIGN: Narrative review. OBJECTIVES: Anterior cervical discectomy and fusion (ACDF) is a reliable procedure, commonly used for cervical degenerative disc disease. For interbody fusions, autograft was the gold standard for decades; however, limited availability and donor site morbidities have led to a constant search for new materials. Clinically, it has been shown that calcium phosphate ceramics, including hydroxyapatite (HA) and tricalcium phosphate (TCP), are effective as osteoconductive materials and bone grafts...
June 2017: Global Spine Journal
https://www.readbyqxmd.com/read/28811169/tissue-engineered-extracellular-matrices-ecms-in-urology-evolution-and-future-directions
#9
REVIEW
N F Davis, E M Cunnane, F J O'Brien, J J Mulvihill, M T Walsh
Autologous gastrointestinal tissue has remained the gold-standard reconstructive biomaterial in urology for >100 years. Mucus-secreting epithelium is associated with lifelong metabolic and neuromechanical complications when implanted into the urinary tract. Therefore, the availability of biocompatible tissue-engineered biomaterials such as extracellular matrix (ECM) scaffolds may provide an attractive alternative for urologists. ECMs are decellularised, biodegradable membranes that have shown promise for repairing defective urinary tract segments in vitro and in vivo by inducing a host-derived tissue remodelling response after implantation...
August 12, 2017: Surgeon: Journal of the Royal Colleges of Surgeons of Edinburgh and Ireland
https://www.readbyqxmd.com/read/28810178/distance-dependent-fluorescence-quenching-and-enhancement-of-gold-nanoclusters-by-gold-nanoparticles
#10
Haiyan Qin, Diao Ma, Jianxiu Du
The interaction between fluorescent gold nanoclusters (AuNCs) and gold nanoparticles (AuNPs) has been investigated. It was observed that the fluorescence of AuNCs was remarkably quenched when direct contact with AuNPs. The fluorescence quenching of AuNCs by AuNPs was dynamic quenching and exhibited size-dependent property. A larger size of AuNPs displayed a stronger quenching effect and gave a larger quenching constant. When a silica spacer shell was introduced between AuNPs and AuNCs, a fluorescence enhancement of AuNCs by Au@SiO2 NPs was observed...
August 10, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28807373/usefulness-of-cocaine-drops-in-investigating-infant-anisocoria
#11
Gilles C Martin, Pierre-Antoine Aymard, Charlotte Denier, Caroline Seghir, Marc Abitbol, Nathalie Boddaert, Dominique Bremond-Gignac, Matthieu P Robert
INTRODUCTION: Whereas apraclonidine has eclipsed cocaine test in the exploration of unilateral miosis in adults, its use in infants is avoided because of the risk of central nervous system depression. This chart review evaluates the usefulness of cocaine drops in infants. METHODS: Infants under the age of one referred for unilateral miosis between November 1, 2009 and November 1, 2015, were reviewed. Patients underwent the following protocol: (1) in case of isolated miosis, cocaine test was performed...
August 4, 2017: European Journal of Paediatric Neurology: EJPN
https://www.readbyqxmd.com/read/28806873/super-resolving-the-actual-position-of-single-fluorescent-molecules-coupled-to-a-plasmonic-nanoantenna
#12
Bing Fu, Benjamin P Isaacoff, Julie S Biteen
Plasmonic nanoparticles (NPs) enhance the radiative decay rate of adjacent dyes and can significantly increase fluorescence intensity for improved spectroscopy. However, the NP nanoantenna complicates super-resolution imaging by introducing a mislocalization between the emitter position and its super-resolved emission position. The mislocalization magnitude depends strongly on the dye/NP coupling geometry. It is therefore crucial to quantify mislocalization to recover the actual emitter position in a coupled system...
August 18, 2017: ACS Nano
https://www.readbyqxmd.com/read/28805097/comparison-of-methods-to-assess-consumption-of-micronutrient-powders-among-young-children-in-nepal
#13
Bernadette N Ng'eno, Cria G Perrine, Giri Raj Subedi, Saba Mebrahtu, Pradiumna Dahal, Maria Elena D Jefferds
BACKGROUND: Assessing micronutrient powder (MNP) consumption is the key for monitoring program performance; no gold standard exists for assessing consumption in nutrition programs. OBJECTIVE: To compare estimates of MNP consumption assessed by maternal report versus observed unopened MNP sachets in the household. METHODS: Cross-sectional household surveys of children aged 6 to 23 months were conducted to assess an MNP project in Nepal; eligible children received 60 sachets per distribution...
January 1, 2017: Food and Nutrition Bulletin
https://www.readbyqxmd.com/read/28804779/language-mapping-using-t2-prepared-bold-functional-mri-in-the-presence-of-large-susceptibility-artifacts-initial-results-in-patients-with-brain-tumor-and-epilepsy
#14
Jun Hua, Xinyuan Miao, Shruti Agarwal, Chetan Bettegowda, Alfredo Quiñones-Hinojosa, John Laterra, Peter C M Van Zijl, James J Pekar, Jay J Pillai
At present, presurgical functional mapping is the most prevalent clinical application of functional magnetic resonance imaging (fMRI). Signal dropouts and distortions caused by susceptibility effects in the current standard echo planar imaging (EPI)-based fMRI images are well-known problems and pose a major hurdle for the application of fMRI in several brain regions, many of which are related to language mapping in presurgical planning. Such artifacts are particularly problematic in patients with previous surgical resection cavities, craniotomy hardware, hemorrhage, and vascular malformation...
June 2017: Tomography: a Journal for Imaging Research
https://www.readbyqxmd.com/read/28803447/registration-free-automatic-identification-of-gold-fiducial-markers-in-mri-target-delineation-images-for-prostate-radiotherapy
#15
Christian Gustafsson, Juha Korhonen, Emilia Persson, Adalsteinn Gunnlaugsson, Tufve Nyholm, Lars E Olsson
PURPOSE: The superior soft tissue contrast of magnetic resonance imaging (MRI) compared to computed tomography (CT) has urged the integration of MRI and elimination of CT in radiotherapy treatment (RT) for prostate. An intraprostatic gold fiducial marker (GFM) appear hyperintense on CT. On T2 weighted (T2w) MRI target delineation images the GFM appear as a small signal void similar to calcifications and post biopsy fibrosis. It can therefore be difficult to identify the markers without CT...
August 13, 2017: Medical Physics
https://www.readbyqxmd.com/read/28802160/the-computerized-perceptual-motor-skills-assessment-a-new-visual-perceptual-motor-skills-evaluation-tool-for-children-in-early-elementary-grades
#16
Tsu-Hsin Howe, Hao-Ling Chen, Candy Chieh Lee, Ying-Dar Chen, Tien-Ni Wang
Visual perceptual motor skills have been proposed as underlying courses of handwriting difficulties. However, there is no evaluation tool currently available to assess these skills comprehensively and to serve as a sensitive measure. The purpose of this study was to validate the Computerized Perceptual Motor Skills Assessment (CPMSA), a newly developed evaluation tool for children in early elementary grades. Its test-retest reliability, concurrent validity, discriminant validity, and responsiveness were examined in 43 typically developing children and 26 children with handwriting difficulty...
August 9, 2017: Research in Developmental Disabilities
https://www.readbyqxmd.com/read/28800505/electrochemical-aptasensor-for-thrombin-using-co-catalysis-of-hemin-g-quadruplex-dnazyme-and-octahedral-cu2o-au-nanocomposites-for-signal-amplification
#17
Shuai Chen, Pin Liu, Kewen Su, Xuan Li, Zhen Qin, Wei Xu, Jun Chen, Chaorui Li, Jingfu Qiu
In this work, novel octahedral Cu2O-Au nanocomposites were synthesized and first applied in an electrochemical aptasensor to detect thrombin (TB) with the aid of a DNAzyme for signal amplification. The octahedral Cu2O-Au nanocomposites have not only simultaneously served as signal amplifying molecules but have also been utilized as an ideal loading platform to immobilize a large number of electroactive substances and recognition probes. Gold nanoparticles (AuNPs) were grown directly on the surface of the octahedral Cu2O nanocrystals, and the Cu2O-Au nanocomposites obtained had the advantages of large surface areas and excellent biocompatibilities...
August 5, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28799618/aggregation-induced-emission-of-gold-i-complexes-in-water-or-water-mixtures
#18
Andrea Pinto, Noora Svahn, João Carlos Lima, Laura Rodríguez
Gold(i) complexes are an expanding area of investigation due to the possibility of giving rise to supramolecular aggregates with particular morphologies that can be modulated together with their luminescent properties. A detailed study has been carried out for gold(i) complexes that self-assemble in aqueous media (in pure water or in mixtures of water and organic solvents in different proportions). The majority of the examples reported until now were found in mixtures of water and DMSO, acetone, DMF or acetonitrile...
August 11, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28796525/quantifying-remote-heating-from-propagating-surface-plasmon-polaritons
#19
Charlotte I Evans, Pavlo Zolotavin, Alessandro Alabastri, Jian Yang, Peter Nordlander, Douglas Natelson
We report a method to electrically detect heating from excitation of propagating surface plasmon polaritons (SPP). The coupling between SPP and a continuous wave laser beam is realized through lithographically defined gratings in the electrodes of thin film gold "bow tie" nanodevices. The propagating SPPs allow remote coupling of optical energy into a nanowire constriction. Heating of the constriction is detectable through changes in the device conductance and contains contributions from both thermal diffusion of heat generated at the grating and heat generated locally at the constriction by plasmon dissipation...
August 14, 2017: Nano Letters
https://www.readbyqxmd.com/read/28795273/capacity-of-gold-nanoparticles-in-cancer-radiotherapy
#20
REVIEW
Nadeem M S Nagi, Yasir A M Khair, Ahmed M E Abdalla
Radiotherapy is the ionizing radiation used for treatment of cancer and other diseases. Although radiotherapy is the major treatment for cancer, a lot of patients do not undergo radiation due to associated risks such as radiation pneumonitis, cardiovascular complications, development of secondary tumor, and lymphedema. However, the advantages of nanotechnology provide a unique potential to enhance radiotherapeutic performance, in particular by utilizing gold nanoparticles (Au NPs). In this review, we briefly describe the current direction of research towards the use of Au NPs for radiotherapeutic enhancement, combination, monitoring and in side effect reductions...
August 9, 2017: Japanese Journal of Radiology
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