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https://www.readbyqxmd.com/read/28319666/full-color-generation-using-silver-tandem-nanodisks
#1
Hao Wang, Xiaolong Wang, Chen Yan, Hua Zhao, Jingwen Zhang, Christian Santschi, Olivier J F Martin
Plasmonic effects associated with metallic nanostructures have been widely studied for color generation. It became apparent that highly saturated and bright colors are hard to obtain and very small nanostructures need to be fabricated. To address this issue, in this study we employ metal-insulator-metal sandwich nanodisks that support enhanced in-phase electric dipole modes, which are blue shifted with respect to a single metal disk. The blue shift enables the generation of short wavelength colors with larger nanostructures...
March 20, 2017: ACS Nano
https://www.readbyqxmd.com/read/28319041/practical-use-of-a-plastic-scintillator-for-quality-assurance-of-electron-beam-therapy
#2
Katsunori Yogo, Yuya Tatsuno, Masato Tsuneda, Yuki Aono, Daiki Mochizuki, Yoshiki Fujisawa, Akihiro Matsushita, Minoru Ishigami, Hiromichi Ishiyama, Kazushige Hayakawa
Quality assurance (QA) of the clinical electron beam is essential for performing accurate and safe radiation therapy. However, with advances in radiation therapy, QA tends to be labor-intensive and time consuming. Here, we propose the practical use of a tissue-equivalent plastic scintillator for quick and easy QA of clinical electron beams. This tool enabled us to verify simultaneously the constancy of output, beam quality, depth and lateral dose profiles during monthly QAs at lower doses of irradiation (small MUs)...
March 20, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28315724/molecular-detection-of-six-virulence-genes-in-pseudomonas-aeruginosa-isolates-detected-in-children-with-urinary-tract-infection
#3
Ali Badamchi, Hossein Masoumi, Shima Javadinia, Ramin Asgarian, Azardokht Tabatabaee
Although a vast majority of Urinary tract infections (UTIs) are caused by E. coli, epidemiological reports have indicated an increasing rate of such infections caused by some other opportunistic organisms including Pseudomonas aeruginosa. Antimicrobial susceptibility and pathogenesis mechanisms of P. aeruginosa are poorly understood. The aim of this study was to detect some virulence factor genes and antimicrobial susceptibility patterns of P. aeruginosa isolates detected in patients with UTI, in children hospital of Tehran, Tehran, Iran...
March 16, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28314376/electrochemical-quantification-of-extracellular-local-h2o2-kinetics-originating-from-single-cells
#4
Monika Bozem, Phillip Knapp, Valentin Mirceski, Ewa Slowik, Ivan Bogeski, Reinhard Kappl, Christian Heinemann, Markus Hoth
AIMS: H2O2 is produced by all eukaryotic cells under physiological and pathological conditions. Due to its enormous relevance for cell signaling at low concentrations and anti-pathogenic function at high concentrations, precise quantification of extracellular local H2O2 concentrations ([H2O2]) originating from single cells is required. RESULTS: Using a scanning electrochemical microscope and bare platinum disk ultramicroelectrodes, we established sensitive long term measurements of extracellular [H2O2] kinetics originating from single primary human monocytes ex vivo...
March 17, 2017: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/28300118/strongly-baryon-dominated-disk-galaxies-at-the-peak-of-galaxy-formation-ten-billion-years-ago
#5
R Genzel, N M Förster Schreiber, H Übler, P Lang, T Naab, R Bender, L J Tacconi, E Wisnioski, S Wuyts, T Alexander, A Beifiori, S Belli, G Brammer, A Burkert, C M Carollo, J Chan, R Davies, M Fossati, A Galametz, S Genel, O Gerhard, D Lutz, J T Mendel, I Momcheva, E J Nelson, A Renzini, R Saglia, A Sternberg, S Tacchella, K Tadaki, D Wilman
In the cold dark matter cosmology, the baryonic components of galaxies-stars and gas-are thought to be mixed with and embedded in non-baryonic and non-relativistic dark matter, which dominates the total mass of the galaxy and its dark-matter halo. In the local (low-redshift) Universe, the mass of dark matter within a galactic disk increases with disk radius, becoming appreciable and then dominant in the outer, baryonic regions of the disks of star-forming galaxies. This results in rotation velocities of the visible matter within the disk that are constant or increasing with disk radius-a hallmark of the dark-matter model...
March 15, 2017: Nature
https://www.readbyqxmd.com/read/28299957/enhancing-glycemic-control-via-detection-of-insulin-using-electrochemical-impedance-spectroscopy
#6
Aldin Malkoc, David Probst, Chi Lin, Mukund Khanwalker, Connor Beck, Curtiss B Cook, Jeffrey T La Belle
BACKGROUND: Currently, glycemic management for individuals with diabetes mellitus involves monitoring glucose only, which is insufficient as glucose metabolism involves other biomarkers such as insulin. Monitoring additional biomarkers alongside glucose has been proposed to improve glycemic control. In this work, the development of a rapid and label-free insulin biosensor with high sensitivity and accuracy is presented. The insulin sensor prototype also serves as a prior study for a multimarker sensing platform technology that can further improve glycemic control in the future...
March 1, 2017: Journal of Diabetes Science and Technology
https://www.readbyqxmd.com/read/28297422/a-methodology-for-on-board-cbct-imaging-dose-using-optically-stimulated-luminescence-detectors
#7
Noor Mail, Muhammad Yusuf, Nazeeh Alothmany, A Abdulrahman Kinsara, Fahad Abdulkhaliq, Suliman M Ghamdi, Abdelhamid Saoudi
Cone-beam computed tomography CBCT systems are used in radiation therapy for patient alignment and positioning. The CBCT imaging procedure for patient setup adds substantial radiation dose to patient's normal tissue. This study presents a complete procedure for the CBCT dosimetry using the InLight optically-stimulated-luminescence (OSL) nanoDots. We report five dose parameters: the mean slice dose (DMSD); the cone beam dose index (CBDIW); the mean volume dose (DMVD); point-dose profile, D(FOV); and the off-field Dose...
September 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28297161/photoreversibility-and-biocompatibility-of-polydimethylsiloxane-coumarin-as-adjustable-intraocular-lens-material
#8
Rachid Jellali, Virginie Bertrand, Michaël Alexandre, Nancy Rosière, Magda Grauwels, Marie-Claire De Pauw-Gillet, Christine Jérôme
Polydimethylsiloxane (PDMS) constitutes an interesting material for a variety of biomedical applications, especially as intraocular lenses (IOLs), for its excellent transparency. In this work, a photoreversible PDMS-coumarin network, whose shape and properties can be adjusted postoperatively in a noninvasive manner, is developed. The synthesis of PDMS-coumarin is achieved by amidation of a coumarin acid chloride derivative with amine-functionalized PDMSs. Under exposure of λ > 300 nm, these polymers can be cured by dimerization of coumarin...
March 15, 2017: Macromolecular Bioscience
https://www.readbyqxmd.com/read/28291698/detection-and-analysis-of-different-interactions-between-resistance-mechanisms-and-carbapenems-in-clinical-isolates-of-klebsiella-pneumoniae
#9
Tanise Vendruscolo Dalmolin, Bianca Vendruscolo Bianchini, Grazielle Guidolin Rossi, Ana Carolina Ramos, Ana Cristina Gales, Priscila de Arruda Trindade, Marli Matiko Anraku de Campos
Carbapenems are considered last-line agents for the treatment of serious infections caused by Klebsiella pneumoniae, and this microorganism may exhibit resistance to β-lactam antibiotics due to different mechanisms of resistance. We evaluated 27 isolates of K. pneumoniae resistant to carbapenems recovered from inpatients at the University Hospital of Santa Maria-RS from July 2013 to August 2014. We carried out antimicrobial susceptibility, carbapenemase detection, testing for the presence of efflux pump by broth microdilution and loss of porin by sodium dodecyl sulfate polyacrylamide gel electrophoresis...
February 9, 2017: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/28290591/self-planarized-quantum-disks-in-nanowires-ultraviolet-b-emitters-utilizing-pendeo-epitaxy
#10
B Janjua, H Sun, C Zhao, D H Anjum, F Wu, A A Alhamoud, X Li, A M Albadri, A Y Alyamani, M M El-Desouki, T K Ng, B S Ooi
The growth of self-assembled, vertically oriented and uniform nanowires (NWs) has remained a challenge for efficient light-emitting devices. Here, we demonstrate dislocation-free AlGaN NWs with spontaneous coalescence, which are grown by plasma-assisted molecular beam epitaxy on an n-type doped silicon (100) substrate. A high density of NWs (filling factor >95%) was achieved under optimized growth conditions, enabling device fabrication without planarization using ultraviolet (UV)-absorbing polymer materials...
March 14, 2017: Nanoscale
https://www.readbyqxmd.com/read/28290267/characterisation-of-penicillin-and-tetracycline-resistance-in-staphylococcus-aureus-isolated-from-bovine-milk-samples-in-minas-gerais-brazil
#11
Caroline L Martini, Carla C Lange, Maria Avp Brito, João B Ribeiro, Letícia C Mendonça, Eliana K Vaz
This Regional Research Communication describes the characterisation of ampicillin, penicillin and tetracycline resistance in Staphylococcus aureus isolated from bovine subclinical mastitis in Minas Gerais State, Brazil. Ninety S. aureus isolates from bovine mastitis exhibiting phenotypic resistance to ampicillin, penicillin and/or tetracycline were selected for this study. The minimum inhibitory concentration (MIC) of each antibiotic was determined using the E-Test® and the production of beta-lactamase was determined by cefinase disks...
March 14, 2017: Journal of Dairy Research
https://www.readbyqxmd.com/read/28288398/characterization-of-extended-spectrum-%C3%AE-lactamases-esbls-producing-salmonella-in-retail-raw-chicken-carcasses
#12
Jing Qiao, Qiang Zhang, Walid Q Alali, Jiawei Wang, Lingyuan Meng, Yingping Xiao, Hua Yang, Sheng Chen, Shenghui Cui, Baowei Yang
Extended-spectrum β-lactamases (ESBLs)-producing Salmonella is considered a serious concern to public health worldwide. However, limited information is available on ESBLs-producing Salmonella in retail chicken products in China. The objective of this study was to characterize ESBLs-producing Salmonella isolates from retail chickens in China. A total of 890 Salmonella isolates from retail chicken carcasses collected from 4 provinces were firstly screened for ESBLs-production phenotype via the double-disk synergy test method...
February 24, 2017: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/28284311/physico-cultural-parameters-during-agnps-biotransformation-with-bactericidal-activity-against-human-pathogens
#13
Gurusamy Raman, Seon Joo Park, Natarajan Sakthivel, Anil K Suresh
Production of AgNPs with desired morphologies and surface characteristics using facile, economic and non-laborious processes is highly imperative. Cell extract based syntheses are emerging as a novel technique for the production of diverse forms of NPs, and is assured to meet the requirements. Therefore, in order to have a better understanding, and to improvise and gain control over the NPs morphological and surface characteristics, the present investigation systematically evaluates the influence of various major physico-cultural parameters including diverse growth media, concentrations of precursor salts; pH and temperature on the biotransformation of ionic silver (Ag(+)) to nanopariculate silver nanoparticles (AgNPs), utilizing the cell free extract of the bacterium, P...
May 2017: Enzyme and Microbial Technology
https://www.readbyqxmd.com/read/28281246/localized-surface-plasmon-resonance-lspr-coupled-fiber-optic-nanoprobe-for-the-detection-of-protein-biomarkers
#14
Jianjun Wei, Zheng Zeng, Yongbin Lin
Here is presented a miniaturized, fiber-optic (FO) nanoprobe biosensor based on the localized surface plasmon resonance (LSPR) at the reusable dielectric-metallic hybrid interface with a robust, gold nano-disk array at the fiber end facet. The nanodisk array is directly fabricated using electron beam lithography (EBL) and metal lift-off process. The free prostate-specific antigen (f-PSA) has been detected with a mouse anti-human prostate-specific antigen (PSA) monoclonal antibody (mAb) as a specific receptor linked with a self-assembled monolayer (SAM) at the LSPR-FO facet surfaces...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28280761/comparison-of-candida-albicans-adherence-to-conventional-acrylic-denture-base-materials-and-injection-molding-acrylic-materials
#15
Masoomeh Aslanimehr, Shirin Rezvani, Ali Mahmoudi, Najmeh Moosavi
STATEMENT OF THE PROBLEM: Candida species are believed to play an important role in initiation and progression of denture stomatitis. The type of the denture material also influences the adhesion of candida and development of stomatitis. PURPOSE: The aim of this study was comparing the adherence of candida albicans to the conventional and injection molding acrylic denture base materials. MATERIALS AND METHOD: Twenty injection molding and 20 conventional pressure pack acrylic discs (10×10×2 mm) were prepared according to their manufacturer's instructions...
March 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28280486/the-resistance-phenotype-and-molecular-epidemiology-of-klebsiella-pneumoniae-in-bloodstream-infections-in-shanghai-china-2012-2015
#16
Shu-Zhen Xiao, Su Wang, Wen-Man Wu, Sheng-Yuan Zhao, Fei-Fei Gu, Yu-Xing Ni, Xiao-Kui Guo, Jie-Ming Qu, Li-Zhong Han
Klebsiella pneumoniae (K.pneumoniae) is a common nosocomial pathogen causing bloodstream infections. Antibiotic susceptibility surveillance and molecular characterization will facilitate prevention and management of K. pneumoniae bloodstream infections. K. pneumoniae isolates causing bloodstream infections were consecutively collected between January 2012 and December 2015 in Shanghai. Eighty isolates (20 per year) were randomly selected and enrolled in this study. Drug susceptibility were determined by the disk diffusion method...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28272920/genetic-characterization-of-listeria-monocytogenes-isolates-from-industrial-and-retail-ready-to-eat-meat-based-foods-and-their-relationship-with-clinical-strains-from-human-listeriosis-in-portugal
#17
A R Henriques, J Melo Cristino, M J Fraqueza
Listeria monocytogenes isolates (n = 81) recovered from ready-to-eat meat-based food products (RTEMP) collected in industrial processing plants and retail establishments were genetically characterized for comparison with those from human clinical cases of listeriosis (n = 49). The aim was to assess RTEMP as a possible food source for human infection. L. monocytogenes was detected in 12.5% of the RTEMP samples, and in some cases, counts were above the European food safety criteria. All isolates were assessed by multiplex PCR for serogroup determination and detection of virulence-associated genes inlA, inlB, inlC, inlJ, plcA, hlyA, actA, and iap...
March 8, 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/28268706/optimal-resonance-configuration-for-ultrasonic-wireless-power-transmission-to-millimeter-sized-biomedical-implants
#18
Miao Meng, Mehdi Kiani
In order to achieve efficient wireless power transmission (WPT) to biomedical implants with millimeter (mm) dimensions, ultrasonic WPT links have recently been proposed. Operating both transmitter (Tx) and receiver (Rx) ultrasonic transducers at their resonance frequency (fr) is key in improving power transmission efficiency (PTE). In this paper, different resonance configurations for Tx and Rx transducers, including series and parallel resonance, have been studied to help the designers of ultrasonic WPT links to choose the optimal resonance configuration for Tx and Rx that maximizes PTE...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28268569/automatic-detection-of-neovascularization-on-optic-disk-region-with-feature-extraction-and-support-vector-machine
#19
Shuang Yu, Di Xiao, Yogesan Kanagasingam
Neovascularization (NV) is a definitive indicator for the onset of Proliferative Diabetic Retinopathy (PDR). The new vessels are fragile and prone to bleed, leading to high risk of sudden vision loss. Automatic detection of NV is an important task in automatic Diabetic Retinopathy (DR) screening as a consequence of the unmet requirement between the growing number of DR patients and limited number of ophthalmologists. This paper focuses on the computer aided detection of neovascularization in the optic disk region...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28268175/dissemination-of-carbapenem-resistant-acinetobacter-baumannii-in-patients-with-burn-injuries
#20
Saeed Shoja, Mojtaba Moosavian, Soodabeh Rostami, Abbas Farahani, Amir Peymani, Khadijeh Ahmadi, Nasim Ebrahimifard
BACKGROUND: Carbapenem-resistant Acinetobacter baumannii has emerged as an important cause of infection in burn patients. This study aimed to characterize the antimicrobial susceptibility pattern, determine the prevalence of oxacillinase and metallo-beta-lactamase (MBL) genes, and type the A. baumannii isolates obtained from burn patients. METHODS: During a 1-year period, a total of 40 nonduplicated isolates of A. baumannii were obtained from burn patients who were hospitalized in the Taleghani Burn Hospital in Ahvaz, in the southwest of Iran...
March 3, 2017: Journal of the Chinese Medical Association: JCMA
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