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https://www.readbyqxmd.com/read/28917757/innovative-thin-layer-chromatographic-method-combined-with-fluorescence-detection-for-specific-determination-of-febuxostat-application-in-biological-fluids
#1
Abdel-Maaboud I Mohamed, Mahmoud A Omar, Sayed M Derayea, Mohamed A Hammad, Abobakr A Mohamed
A newly developed thin-layer chromatographic (TLC) method coupled with fluorescence detection for specific determination of Febuxostat (FEB) was designed. The proposed method adopts exposure of FEB on a developed TLC plate to hydrochloric acid vapors, resulting in a large enhancement of its weak fluorescence, permitting its specific and sensitive determination in real human plasma and urine after excitation at 345nm on 60 F254 silica gel plates using toluene-ethyl acetate-methanol-glacial acetic acid; (30:10:5:0...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28917737/3-4-diaminotoluene-sensor-development-based-on-hydrothermally-prepared-mncoxoy-nanoparticles
#2
Mohammed M Rahman, M M Alam, Abdullah M Asiri, M A Islam
A facile hydrothermal process was used to prepare MnCoxOy nanoparticles (NPs) in alkaline medium (pH~10.5) at room temperature. The NPs were characterized by Fourier-transform infrared spectroscopy (FTIR), ultraviolet visible spectroscopy (UV/vis), field emission scanning electron microscopy (FESEM), X-ray photoelectron spectroscopy (XPS), energy-dispersive X-ray spectroscopy (EDS), and powder X-ray diffraction (XRD). A thin layer of NPs film as a chemical sensor was fabricated on a glassy carbon electrode (GCE) with the help of a conducting binder...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28917670/morphological-characterization-and-biocontrol-effects-of-vibrio-vulnificus-phages-against-vibriosis-in-the-shrimp-aquaculture-environment
#3
P Srinivasan, P Ramasamy
The re-emerging field of phage therapy is the potential biocontrol agents for the transfer of virulence factor and to kill their bacterial hosts. In this study, the lytic Vibrio vulnificus phages were studied to provide a better understanding of phage-host interactions and development of phage therapy. Four new V. vulnificus phages were detected from shrimp aquaculture system, named VV1, VV2, VV3 and VV4. All lytic V. vulnificus phages are the Tecviruses of the family Tectiviridae with typical double layered elongated icosahedral head and tailless morphology...
September 13, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28915055/an-efficient-method-of-designing-stable-layered-cathode-material-for-sodium-ion-batteries-using-aluminum-doping
#4
Hari Vignesh Ramasamy, Karthikeyan Kaliyappan, Ranjith Thangavel, Won Mo Seong, Kisuk Kang, Zhongwei Chen, Yun-Sung Lee
Despite their high specific capacity, sodium layered oxides suffer from severe capacity fading when cycled at higher voltages. This key issue must be addressed in order to develop high-performance cathodes for sodium ion batteries (SIBs). Herein, we present a comprehensive study on the influence of Al doping of Mn sites on the structural and electrochemical properties of a P2-Na0.5Mn0.5-xAlxCo0.5O2 (x = 0, 0.02, or 0.05) cathode for SIBs. Detailed structural, morphological, and electrochemical investigations were carried out using X-ray diffraction, cyclic voltammetry, and galvanostatic charge-discharge measurements and some new insights are proposed...
September 15, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28915010/molecular-engineering-for-enhanced-charge-transfer-in-thin-film-photoanode
#5
Jeong Soo Kim, Byung-Man Kim, Un-Young Kim, HyeonOh Shin, Jung Seung Nam, Deok-Ho Roh, Tae-Hyuk Kwon
We developed three types of dithieno[3,2-b;2',3'-d]thiophene (DTT)-based organic sensitizers for high-performance thin photoactive TiO2 films and investigate the simple but powerful molecular engineering of different types of bonding between the triarylamine electron donor and the conjugated DTT π-bridge by the introduction of single, double, and triple bonds. As a result, with only 1.3-μm transparent and 2.5-μm TiO2 scattering layers, the triple bond sensitizer (T-DAHTDTT) shows the highest power conversion efficiency (η = 8...
September 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28914539/phonon-assisted-ultrafast-charge-transfer-at-van-der-waals-heterostructure-interface
#6
Qijing Zheng, Wissam A Saidi, Yu Xie, Zhenggang Lan, Oleg V Prezhdo, Hrvoje Petek, Jin Zhao
The van der Waals (vdW) interfaces of two-dimensional (2D) semiconductor are central to new device concepts and emerging technologies in light-electricity transduction where the efficient charge separation is a key factor. Contrary to general expectation, efficient electron-hole separation can occur in vertically stacked transition-metal dichalcogenide (TMD) heterostructure bilayers through ultrafast charge transfer between the neighboring layers despite their weak vdW bonding. In this report, we show by ab initio non-adiabatic molecular dynamics (NAMD) calculations, that instead of direct tunneling, the ultrafast interlayer hole transfer is strongly promoted by an adiabatic (AD) mechanism through phonon excitation occurring on 20 fs, which is in good agreement with the experiment...
September 15, 2017: Nano Letters
https://www.readbyqxmd.com/read/28914397/influence-of-acid-treatment-on-surface-properties-and-in-vivo-performance-of-ti6al4v-alloy-for-biomedical-applications
#7
Daniel J Fernandes, Ruy G Marques, Carlos N Elias
The purpose of this work was to investigate the influence of acid treatment on the surface properties and in vivo performance of titanium grade 5 (Ti6Al4V) alloy. Mini-implants with surface treatment were inserted into New Zealand rabbit tibia for 1, 4 and 8 weeks. SEM analysis showed intercommunicated micropores in acid treated samples. AFM showed micron and sub-micron roughness. The thickness of the titanium oxide layer increased with surface treatment, with a significant reduction of Al and V concentration...
September 15, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28913981/age-dependent-expression-of-nav1-9-channels-in-medial-prefrontal-cortex-mpfc-pyramidal-neurons-in-rats
#8
Maciej Gawlak, Bartłomiej Szulczyk, Adam Berlowski, Katarzyna Grzelka, Anna Stachurska, Justyna Pelka, Katarzyna Czarzasta, Maciej Malecki, Przemyslaw Kurowski, Ewa Nurowska, Pawel Szulczyk
Developmental changes that occur in the prefrontal cortex during adolescence alter behavior. These behavioral alterations likely stem from changes in prefrontal cortex neuronal activity, which may depend on the properties and expression of ion channels. Nav1.9 sodium channels conduct a Na(+) current that is TTX resistant with a low threshold and noninactivating over time. The purpose of this study was to assess the presence of Nav1.9 channels in medial prefrontal cortex (mPFC) layer II and V pyramidal neurons in young (20-day-old), late adolescent (60-day-old) and adult (6-7-month-old) rats...
September 15, 2017: Developmental Neurobiology
https://www.readbyqxmd.com/read/28913959/quantification-through-tlc-densitometric-analysis-repellency-and-anticholinesterase-activity-of-the-homemade-extract-of-indian-cloves
#9
Raphael S Affonso, Josélia A Lima, Bruno Lessa, João V O Caetano, Marcos T Obara, Andrea Nóbrega, Eugenie Nepominova, Kamil Musilek, Kamil Kuca, Gláucia Barbosa Candido Alves Slana, Tanos C C França
The rise of mosquito's transmitted diseases, like dengue, zika and chikungunya in Brazil in the last years has increased the concerns on protection against mosquito's bites. However, the prohibitive prices of the commercially available repellents for the majority of the Brazilian population, has provoked a search for cheaper solutions, like the use of the homemade ethanolic extract of Indian clove (Syzygium aromaticum L.) as repellent, which has been reported as quite efficient by the local press. In order to verify this, we performed here, the quantification of the main components of this extract through high-performance thin-layer chromatography (HPTLC)-densitometry and evaluated its efficiency as repellent, as well as the acetylcholinesterase (AChE) inhibition capacity...
September 15, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/28912798/comparative-genomic-analysis-of-the-human-gut-microbiome-reveals-a-broad-distribution-of-metabolic-pathways-for-the-degradation-of-host-synthetized-mucin-glycans-and-utilization-of-mucin-derived-monosaccharides
#10
Dmitry A Ravcheev, Ines Thiele
The colonic mucus layer is a dynamic and complex structure formed by secreted and transmembrane mucins, which are high-molecular-weight and heavily glycosylated proteins. Colonic mucus consists of a loose outer layer and a dense epithelium-attached layer. The outer layer is inhabited by various representatives of the human gut microbiota (HGM). Glycans of the colonic mucus can be used by the HGM as a source of carbon and energy when dietary fibers are not sufficiently available. Both commensals and pathogens can utilize mucin glycans...
2017: Frontiers in Genetics
https://www.readbyqxmd.com/read/28906515/study-of-the-presence-of-spherical-deformations-on-the-al-top-electrode-due-to-electroforming-in-rewritable-organic-resistive-memories
#11
J A Ávila-Niño, M Reyes-Reyes, R López-Sandoval
Physical deformations are observed at the top electrodes during the electroforming process in Al/PEDOT:PSS + nitrogen doped multiwalled carbon nanotube (N-MWCNTs)/Al rewritable resistive memory devices. These physical deformations arise from electrochemical reactions, i.e., a reduction reaction in the native Al oxide layer, which are similar to those reported in TiO2-based resistive memory devices. These memory devices are electroformed at the ON state using an ∼-2 V pulse or at the OFF state using an ∼3 V pulse...
September 14, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28901733/preparation-of-graphene-sheets-by-electrochemical-exfoliation-of-graphite-in-confined-space-and-their-application-in-transparent-conductive-films
#12
Hui Wang, Can Wei, Kaiyi Zhu, Yu Zhang, Chunhong Gong, Jianhui Guo, JiWei Zhang, Laigui Yu, Jingwei Zhang
A novel electrochemical exfoliation mode was established to prepare graphene sheets efficiently with potential applications in transparent conductive films. The graphite electrode was coated with paraffin to keep the electrochemical exfoliation in confined space in the presence of concentrated sodium hydroxide as the electrolyte, yielding ~100% low-defect (the D band to G band intensity ratio ID/IG = 0.26) graphene sheets. Furthermore, ozone was first detected with ozone test strips, and the effect of ozone on the exfoliation of graphite foil and the microstructure of the as-prepared graphene sheets was investigated...
September 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28901123/atomic-layer-deposition-growth-of-ultra-thin-hfo2-film-on-graphene
#13
Meng-Meng Xiao, Chenguang Qiu, Zhiyong Zhang, Lianmao Peng
Direct growth of ultra-thin gate dielectric layer with high uniformity and high quality on graphene remains a challenge for developing graphene-based transistors due to the chemical inert surface properties of graphene. Here we develop a method to realize atomic-layer-deposition (ALD) growth of ultra-thin high-k dielectric layer on graphene through pre-modified graphene surface using electron beam irradiation. An amorphous carbon layer induced by electron beam scanning is formed on graphene, and then acts as seed for ALD growth of high-k dielectrics...
September 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28900251/integration-of-c-axis-oriented-bi3-15nd0-85ti2-95hf0-05o12-la0-67sr0-33mno3-ferromagnetic-ferroelectric-composite-film-on-si-substrate
#14
Zongfan Duan, Ying Cui, Gaoyang Zhao, Xiaoguang Li, Biaolin Peng, Chunchun Han
A La0.67Sr0.33MnO3 (LSMO) ferromagnetic layer and a Nd(3+)/Hf(4+) co-substituted Bi4Ti3O12 (Bi3.15Nd0.85Ti3-xHfxO12 (BNTHx, x = 0, 0.025, 0.05, 0.1 and 0.15)) ferroelectric layer were successively deposited onto the (00 l)-oriented LaNiO3 (LNO) layer buffered (001) Si substrate via all chemical solution deposition (CSD) method. As a result, the BNTHx/LSMO ferromagnetic-ferroelectric composite films integrated on Si substrate exhibit high c-axis orientation. The Nd(3+)/Hf(4+) co-substituted BNTHx films have the lower leakage current and the better ferroelectric properties than the mono-substituted Bi4Ti3O12 (Bi3...
September 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28900097/electrical-properties-and-thermal-stability-in-stack-structure-of-hfo2-al2o3-insb-by-atomic-layer-deposition
#15
Min Baik, Hang-Kyu Kang, Yu-Seon Kang, Kwang-Sik Jeong, Youngseo An, Seongheum Choi, Hyoungsub Kim, Jin-Dong Song, Mann-Ho Cho
Changes in the electrical properties and thermal stability of HfO2 grown on Al2O3-passivated InSb by atomic layer deposition (ALD) were investigated. The deposited HfO2 on InSb at a temperature of 200 °C was in an amorphous phase with low interfacial defect states. During post-deposition annealing (PDA) at 400 °C, In-Sb bonding was dissociated and diffusion through HfO2 occurred. The diffusion of indium atoms from the InSb substrate into the HfO2 increased during PDA at 400 °C. Most of the diffused atoms reacted with oxygen in the overall HfO2 layer, which degraded the capacitance equivalent thickness (CET)...
September 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28898737/light-illumination-intensity-dependence-of-photovoltaic-parameter-in-polymer-solar-cells-with-ammonium-heptamolybdate-as-hole-extraction-layer
#16
Zhiyong Liu, Shengli Niu, Ning Wang
A low-temperature, solution-processed molybdenum oxide (MoOX) layer and a facile method for polymer solar cells (PSCs) is developed. The PSCs based on a MoOX layer as the hole extraction layer (HEL) is a significant advance for achieving higher photovoltaic performance, especially under weaker light illumination intensity. Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) measurements show that the (NH4)6Mo7O24 molecule decomposes and forms the molybdenum oxide (MoOX) molecule when undergoing thermal annealing treatment...
September 7, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28898112/functional-odontoblastic-like-cells-derived-from-human-ipscs
#17
H Xie, N Dubey, W Shim, C J A Ramachandra, K S Min, T Cao, V Rosa
The induced pluripotent stem cells (iPSCs) have an intrinsic capability for indefinite self-renewal and large-scale expansion and can differentiate into all types of cells. Here, we tested the potential of iPSCs from dental pulp stem cells (DPSCs) to differentiate into functional odontoblasts. DPSCs were reprogrammed into iPSCs via electroporation of reprogramming factors OCT-4, SOX2, KLF4, LIN28, and L-MYC. The iPSCs presented overexpression of the reprogramming genes and high protein expressions of alkaline phosphatase, OCT4, and TRA-1-60 in vitro and generated tissues from 3 germ layers in vivo...
September 1, 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28898045/impact-of-hetero-interfaces-in-solar-cells-using-znsnp2-bulk-crystals
#18
Shigeru Nakatsuka, Shunsuke Akari, Jakapan Chantana, Takashi Minemoto, Yoshitaro Nose
We report on the optimization of interface structure in ZnSnP2 solar cells. The effects of back electrode materials and related interface on photovoltaic performance were investigated. It was clarified that a conventional structure Mo/ZnSnP2 showed a schottky-behaviour, while an ohmic-behaviour was observed in the Cu/ZnSnP2 structure annealed at 300 °C. STEM-EDX analysis suggested that Cu-Sn-P ternary compound was formed at the interface. This compound is considered to play an important role to obtain the ohmic contact between ZnSnP2 and Cu...
September 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28895725/luminescent-and-photoconductive-layered-lead-halide-perovskite-compounds-comprising-mixtures-of-cesium-and-guanidinium-cations
#19
Olga Nazarenko, Martin Robert Kotyrba, Michael Wörle, Eduardo Cuervo-Reyes, Sergii Yakunin, Maksym V Kovalenko
Interest in hybrid organic-inorganic lead halide compounds with perovskite-like two-dimensional crystal structures is growing due to the unique electronic and optoelectronic properties of these compounds. Herein, we demonstrate the synthesis, thermal and optical properties, and calculations of the electronic band structures for one- and two-layer compounds comprising both cesium and guanidinium cations: Cs[C(NH2)3]PbI4 (I), Cs[C(NH2)3]PbBr4 (II), and Cs2[C(NH2)3]Pb2Br7 (III). Compounds I and II exhibit intense photoluminescence at low temperatures, whereas compound III is emissive at room temperature...
September 12, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28894412/recording-spikes-activity-in-cultured-hippocampal-neurons-using-flexible-or-transparent-graphene-transistors
#20
Farida Veliev, Zheng Han, Dipankar Kalita, Anne Briançon-Marjollet, Vincent Bouchiat, Cécile Delacour
The emergence of nanoelectronics applied to neural interfaces has started few decades ago, and aims to provide new tools for replacing or restoring disabled functions of the nervous systems as well as further understanding the evolution of such complex organization. As the same time, graphene and other 2D materials have offered new possibilities for integrating micro and nano-devices on flexible, transparent, and biocompatible substrates, promising for bio and neuro-electronics. In addition to many bio-suitable features of graphene interface, such as, chemical inertness and anti-corrosive properties, its optical transparency enables multimodal approach of neuronal based systems, the electrical layer being compatible with additional microfluidics and optical manipulation ports...
2017: Frontiers in Neuroscience
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