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https://www.readbyqxmd.com/read/29458204/a-review-of-implantable-biosensors-for-closed-loop-glucose-control-and-other-drug-delivery-applications
#1
Kee Scholten, Ellis Meng
Closed-loop drug delivery promises autonomous control of pharmacotherapy through the continuous monitoring of biomarker levels. For decades, researchers have strived for portable closed-loop systems, capable of treating ambulatory patients with chronic conditions such as diabetes mellitus. After years of development, the first of these systems have left the laboratory and entered commercial use. This long-awaited advance reflects recent development of chronically stable implantable biosensors, able to accurately measure biomarker levels in vivo...
February 16, 2018: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29458016/renal-toxicological-evaluations-of-sulphonated-nanocellulose-from-khaya-sengalensis-seed-in-wistar-rats
#2
Adewale Adewuyi, Chiagoziem A Otuechere, Olusegun L Adebayo, Chibuzo Anazodo, Fabiano V Pereira
Nanocellulose is currently gaining attention due to its unique properties. This attention includes its application as building blocks for developing novel functional materials, plant drug and also in drug delivery systems. However, its safety remains largely untested or less understood. Thus, sulphonated nanocellulose (KSS) was prepared from cellulose (KSC) isolated from Khaya senegalensis seed (KS). KS, KSC and KSS were characterized using Fourier transformed infrared (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TG), particle size distribution (PSD), zeta potential and scanning electron microscopy (SEM)...
February 16, 2018: Chemico-biological Interactions
https://www.readbyqxmd.com/read/29457978/size-dependent-thermodynamics-and-kinetics-of-adsorption-on-nanoparticles-a-theoretical-and-experimental-study
#3
Zixiang Cui, Juan Zhang, Yongqiang Xue, Huijuan Duan
Owing to their excellent adsorption properties compared with those of the corresponding bulk materials, nanoparticles have been widely applied in many fields. Their properties depend on the thermodynamics and kinetics of adsorption, which depend on the particle size. In this paper, we present universal theories of the thermodynamics and kinetics for nano-adsorption that have been developed over the past few years. Theoretically, we have derived relationships between the adsorption thermodynamic properties and the particle size, as well as those between the adsorption kinetic parameters and the particle size...
February 19, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29457975/fluorescent-dna-probing-nanoscale-mno2-adsorption-dissolution-by-thiol-and-nanozyme-activity
#4
Liu Wang, Zhicheng Huang, Yibo Liu, Jian Wu, Juewen Liu
Manganese dioxide (MnO2) is an interesting material due to its excellent biocompatibility and magnetic properties. Adsorption of DNA to MnO2 is potentially interest for drug delivery and sensing applications. However, little fundamental understanding is known about their interactions. In this work, carboxyfluorescein (FAM)-labeled DNA oligonucleotides were used to explore the effect of salt concentration, pH, and DNA sequence and length for adsorption by MnO2, and comparisons were made with graphene oxide (GO)...
February 19, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29457973/pyrazole-tetrazole-hybrid-bearing-the-trinitromethyl-fluorodinitromethyl-or-difluoroamino-dinitromethyl-groups-high-performance-energetic-materials
#5
Aleksei B Sheremetev, Igor L Dalinger, Nikita V Muravyev, Kyrill Yu Suponitsky, Aleksandr V Kormanov
High nitrogen compounds have acquired great scientific interest and technological importance because of their unique energy content, and they find diverse applications in many fields of science and technology. Understanding of structure-property relationship trends as well as how to modify them is of paramount importance for their further improvement. Herein, we have used installation of oxygen-rich modules, C(NO2)3, C(NO2)2F or C(NO2)2NF2, to a endothermic framework, that is combination of nitropyrazole unit and tetrazole ring, as a way to design novel energetic compounds...
February 19, 2018: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29457966/combined-treatment-with-valproic-acid-and-5-aza-2-deoxycytidine-synergistically-inhibits-human-clear-cell-renal-cell-carcinoma-growth-and-migration
#6
Wenjin Xi, Xu Chen, Jinbo Sun, Wei Wang, Yi Huo, Guoxu Zheng, Jieheng Wu, Yufang Li, Angang Yang, Tao Wang
BACKGROUND Histone acetylation and DNA methylation are important mammalian epigenetic modifications that participate in the regulation of gene expression. Because dysregulation of histone deacetylase and DNA methyltransferases are hallmarks of malignancy, they have become promising therapeutic targets. In this study, we explored the anti-tumor activity of valproic acid (VPA), a histone deacetylase inhibitor (HDACi) and 5-Aza-2'-deoxycytidine (5-Aza), an inhibitor of DNA methyltransferases, on renal cell carcinoma (RCC) cell lines 786-O and 769-P...
February 19, 2018: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/29457965/probing-in-plane-anisotropy-in-few-layer-res-2-using-low-frequency-noise-measurement
#7
Richa Mitra, Bhakti Jariwala, Arnab Bhattacharya, Anindya Das
ReS2 , a layered two-dimensional material popular for its in-plane anisotropic properties, is emerging as one of the potential candidates for flexible electronics and ultrafast optical applications. It is an n-type semiconducting material having a layer independent bandgap of 1.55 eV. In this paper we have characterized the intrinsic electronic noise level of few-layer ReS2 for the first time. Few-layer ReS2 field effect transistor devices show a 1/f nature of noise for frequency ranging over three orders of magnitude...
February 19, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29457964/liver-imaging-reporting-and-data-system-patient-outcomes-for-category-4-and-5-nodules
#8
Sang Hyun Choi, Jae Ho Byun, Young-Suk Lim, So Jung Lee, So Yeon Kim, Hyung Jin Won, Yong Moon Shin, Pyo-Nyun Kim
Purpose To determine the outcomes after initial therapy in patients with chronic liver disease and retrospectively assigned Liver Imaging Reporting and Data System (LI-RADS; version 2014) category 4 (LR-4) and 5 (LR-5) nodules at gadoxetate disodium-enhanced MR imaging. Materials and Methods In this retrospective study, 260 patients with a single LR-4 (n = 132) or LR-5 (n = 128) nodule who were assigned a LI-RADS category were included. Patients were identified between January 2012 and December 2012, and were initially treated by resection, liver transplant, radiofrequency ablation (RFA), or transcatheter arterial chemoembolization (TACE) according to the Barcelona Clinic Liver Cancer staging system...
February 19, 2018: Radiology
https://www.readbyqxmd.com/read/29457963/3-t-mr-imaging-of-proximal-femur-microarchitecture-in-subjects-with-and-without-fragility-fracture-and-nonosteoporotic-proximal-femur-bone-mineral-density
#9
Gregory Chang, Chamith S Rajapakse, Cheng Chen, Arakua Welbeck, Kenneth Egol, Ravinder R Regatte, Punam K Saha, Stephen Honig
Purpose To determine if 3-T magnetic resonance (MR) imaging of proximal femur microarchitecture can allow discrimination of subjects with and without fragility fracture who do not have osteoporotic proximal femur bone mineral density (BMD). Materials and Methods Sixty postmenopausal women (30 with and 30 without fragility fracture) who had BMD T scores of greater than -2.5 in the hip were recruited. All subjects underwent dual-energy x-ray absorptiometry to assess BMD and 3-T MR imaging of the same hip to assess bone microarchitecture...
February 19, 2018: Radiology
https://www.readbyqxmd.com/read/29457935/customized-titanium-lattice-structure-in-three-dimensional-alveolar-defect-an-initial-case-letter
#10
Marcus Seiler, Peer W Kaemmerer, Michael Peetz, Amely Gundula Hartmann
The aim of this initial case report was to provide a new protocol for the clinical application of a patient-specific titanium lattice structure (Yxoss CBR®, ReOSS, Filderstadt, Germany) for customized bone regeneration. To obtain a 3-dimensional reconstruction of a posterior mandible segment in a 61-year-old woman, a patient-specific titanium customized lattice structure was used. As graft material autogenous bone tissue mixed with xenogenic alloplastic material (Bio Oss®, Geistlich Pharma, Wolhusen, Switzerland) was obtained for reconstruction...
February 19, 2018: Journal of Oral Implantology
https://www.readbyqxmd.com/read/29457900/three-dimensional-structures-based-on-the-fusion-of-chrysene-and-spirobifluorene-chromophores-for-the-development-of-blue-oleds
#11
Hayoon Lee, Hyocheol Jung, Seokwoo Kang, Jin Hyuck Heo, Sang Hyuk Im, Jongwook Park
A new deep-blue chromophore containing a three-dimensionally (3D) shaped CS core composed of fused chrysene and spirofluorene units is synthesized. A pair of m-terphenyl (TP) units is also substituted onto the CS core, at two different sets of positions to form two additional compounds: CS-TPTP and TP-CS-TP. The TP-CS-TP compound showed the highest efficiency with an external quantum efficiency (EQE) of 3.05%, and Commission Internationale de L'Eclairage coordinates (CIE) of (0.148, 0.098) corresponding to the emission of blue light...
February 19, 2018: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/29457897/macrocyclic-oligofurans-a-computational-study
#12
Or Dishi, Ori Gidron
Macrocyclic oligothiophenes (nCT) have been extensively explored for their unique optical and electronic properties, while their oxygen containing analogs, macrocyclic oligofurans (nCF), are not known. In this work, macrocyclic oligofurans bearing 5 to 16 units (5CF-16CF) are studied theoretically at the B3LYP/6-311G(d) level. We find that small macrocycles (6CF-8CF) exhibit planar or nearly-planar geometries, low strain energies, low HOMO-LUMO gaps, and strong π-conjugation as also reflected in their Raman spectra...
February 19, 2018: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/29457890/headspace-solid-phase-microextraction-coupled-to-miniaturized-microplasma-optical-emission-spectrometry-for-detection-of-mercury-and-lead
#13
Chengbin Zheng, Ligang Hu, Xiandeng Hou, Bin He, Guibin Jiang
Despite increased interest in microplasma atomic spectrometry over the past several years, its applications to field analysis of real samples still remain limited due to its low sensitivity. In this work, headspace solid-phase microextraction (HS-SPME) using PDMS/DVB fiber was used as a sample introduction method to improve the sensitivity of a miniature (6.0 cm length × 5.0 cm width × 2.8 cm height) low power (<10 W) microplasma point discharge optical emission spectrometer (PD-OES) for the determination of Hg and Pb after their derivatization with sodium tetraethylborate (NaBEt4)...
February 19, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29457889/rapid-microwave-preparation-and-composition-tuning-of-the-high-performance-magnetocalorics-mn-fe-2-p-si
#14
Jason H Grebenkemper, Joshua D Bocarsly, Emily E Levin, Gareth Seward, Colin Heikes, Craig Brown, Sumohan Misra, Fabian Seeler, Kerstin Schierle-Arndt, Stephen D Wilson, Ram Seshadri
Rapid preparation utilizing assisted microwave heating permits significantly shorter preparation times for magnetocaloric compounds in the (Mn,Fe)2 (P,Si) family, specifically samples of (Mn,Fe)2-δ P0.5 Si0.5 with starting compositions of δ = 0, 0.06, and 0.12. To fully understand the effects of processing and composition changes on structure and properties, these materials are characterized using synchrotron powder diffraction, neutron powder diffraction, electron microprobe analysis (EMPA), X-ray fluorescence (XRF), and magnetic measurements...
February 19, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29457886/janus-gradient-meshes-for-continuous-separation-and-collection-of-flowing-oils-under-water
#15
Ning Li, Cunlong Yu, Yifan Si, Meirong Song, Zhichao Dong, Lei Jiang
Gradient meshes with Janus wettabilities are fabricated to stably separate and collect spilled oils from a range of flowing oily wastewater. Here, we demonstrate an overflow with separation methodology, which combines selective oil overflow and membrane separation, to separate low content oils from dynamic flowing oil-water mixtures by a curved gradient mesh that covered on a solid edge. The microscaled air-oil-water-solid four-phase wetting state during the oil-water separation process is visualized and demonstrated...
February 19, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29457822/a-nitrogen-rich-ligand-as-a-scaffold-for-slow-magnetic-relaxation-in-dysprosium-based-0d-and-1d-architectures
#16
Gabriel Brunet, Elena Sebastiao, Tomasz G Witkowski, Ilia Korobkov, Bulat Gabidullin, Muralee Murugesu
A recently designed nitrogen-rich ligand is successfully applied as a scaffold for lanthanide ions to show that the intricate chemistry of energetic materials can be combined with other fields of research, including that of molecular magnetism. Herein, we report the synthesis of two different types of molecular architectures using a single ligand template, in which the discrete monomer exhibits single-molecule magnet-like behaviour along with two well-isolated modes of magnetic relaxation.
February 19, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29457808/cds-nanosphere-decorated-hollow-polyhedral-zco-derived-from-a-metal-organic-framework-mof-for-effective-photocatalytic-water-evolution
#17
Wenxia Chen, Jiasheng Fang, Yiwei Zhang, Guangliang Chen, Shuo Zhao, Chao Zhang, Ran Xu, Jiehua Bao, Yuming Zhou, Xin Xiang
Semiconductor nanostructures have received considerable attention in the field of photocatalytic hydrogen evolution. However, eco-friendly, high efficiency, and low-cost semiconductor materials are still desired. In consideration of this, herein, we design a new and economic noble-metal-free CdS/Znx Co3-x O4 (CdS/ZCO) nanohybrid photocatalyst using a metal-organic framework (MOF) template, which is a framework structure composed of organic ligands and metal ion nodes with different numbers of connections. The as-prepared CdS/ZCO composites with a large specific surface area and porous hollow structure exhibit remarkable catalytic activity and high stability for hydrogen generation...
February 19, 2018: Nanoscale
https://www.readbyqxmd.com/read/29457806/enhancement-of-the-selectivity-of-mxenes-m-2-c-m-ti-v-nb-mo-via-oxygen-functionalization-promising-materials-for-gas-sensing-and-separation
#18
A Junkaew, R Arróyave
Two-dimensional graphene-like materials, namely MXenes, have been proposed as potential materials for various applications. In this work, the reactivity and selectivity of four MXenes (i.e. M2 C (M = Ti, V, Nb, Mo)) and their oxygen-functionalized forms (i.e. O-MXenes or M2 CO2 ) toward gas molecules were investigated by using the plane wave-based Density Functional Theory (DFT) calculations. Small gas molecules, which are commonly found in flue gas streams, are considered herein. Our results demonstrated that MXenes are very reactive...
February 19, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29457781/efficient-synthesis-of-tungsten-oxide-hydrate-based-nanocomposites-for-applications-in-bifunctional-electrochromic-energy-storage-devices
#19
Xueting Chang, Ruirui Hu, Shibin Sun, Tong Lu, Tao Liu, Yanhua Lei, Lihua Dong, Yansheng Yin, Yanqiu Zhu
In this work, we realized the large-scale synthesis of WO3·H2O nanoflakes (NFs), g-C3N4/WO3·H2O nanocomposite (NC) and graphene (G)/WO3·H2O NC via a sonochemical process with tungsten salt as the precursor, g-C3N4 or G sheets as the supports, and distilled water as the solvent. Both the g-C3N4/WO3·H2O NC and the G/WO3·H2O NC exhibited much better EC performance (higher coloration efficiencies and faster response times) than that of the WO3·H2O NFs. Using the WO3·H2O-based materials as electrode materials, EC batteries that integrate the energy storage and EC functions in one device have been assembled...
February 19, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29457760/a-systematic-review-of-serious-games-in-medical-education-quality-of-evidence-and-pedagogical-strategy
#20
Iouri Gorbanev, Sandra Agudelo-Londoño, Rafael A González, Ariel Cortes, Alexandra Pomares, Vivian Delgadillo, Francisco J Yepes, Óscar Muñoz
INTRODUCTION: The literature shows an optimistic landscape for the effectiveness of games in medical education. Nevertheless, games are not considered mainstream material in medical teaching. Two research questions that arise are the following: What pedagogical strategies do developers use when creating games for medical education? And what is the quality of the evidence on the effectiveness of games? METHODS: A systematic review was made by a multi-disciplinary team of researchers following the Cochrane Collaboration Guidelines...
December 2018: Medical Education Online
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