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https://www.readbyqxmd.com/read/28445813/microfluidic-integrated-patterned-ito-immunosensor-for-rapid-detection-of-prostate-specific-membrane-antigen-biomarker-in-prostate-cancer
#1
Rajesh Seenivasan, Chandra K Singh, Jay W Warrick, Nihal Ahmad, Sundaram Gunasekaran
An optically transparent patterned indium tin oxide (ITO) three-electrode sensor integrated with a microfluidic channel was designed for label-free immunosensing of prostate-specific membrane antigen (PSMA), a prostate cancer (PCa) biomarker, expressed on prostate tissue and circulating tumor cells but also found in serum. The sensor relies on cysteamine capped gold nanoparticles (N-AuNPs) covalently linked with anti-PSMA antibody (Ab) for target specificity. A polydimethylsiloxane (PDMS) microfluidic channel is used to efficiently and reproducibly introduce sample containing soluble proteins/cells to the sensor...
April 11, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28445595/ventricular-fibrillation-cardiac-arrest-produces-a-chronic-striatal-hyperdopaminergic-state-that-is-worsened-by-methylphenidate-treatment
#2
Gerald J Nora, Rashed Harun, David F Fine, Daniel Hutchison, Adam C Grobart, Jason P Stezoski, Miranda Munoz, Patrick M Kochanek, Rehana K Leak, Tomas Drabek, Amy K Wagner
Cardiac arrest survival rates have improved with modern resuscitation techniques, but many survivors experience impairments associated with hypoxic-ischemic brain injury. Currently, little is understood about chronic changes in striatal dopamine (DA) systems after hypoxic-ischemic brain injury. Given the common empiric clinical use of DA enhancing agents in neurorehabilitation, investigation evaluating dopaminergic alterations after cardiac arrest (CA) is necessary to optimize rehabilitation approaches. We hypothesized that striatal DA neurotransmission would be altered chronically after ventricular fibrillation cardiac arrest (VF-CA)...
April 26, 2017: Journal of Neurochemistry
https://www.readbyqxmd.com/read/28444923/anaerobic-respiration-on-self-doped-conjugated-polyelectrolytes-impact-of-chemical-structure
#3
Nathan D Kirchhofer, Samantha R McCuskey, Cheng-Kang Mai, Guillermo C Bazan
We probe anaerobic respiration of bacteria in the presence of conjugated polyelectrolytes (CPEs). Three different CPEs were used to probe how structural variations impact biocurrent generation from Shewanella oneidensis MR-1. For the self-doped anionic CPE only, absorption spectroscopy shows that the addition of S. oneidensis MR-1 leads to the disappearance of the polaron (radical cation) band at >900 nm and an increase in the band at 735 nm due to the neutral species, consistent with electron transfer from microbe to polymer...
April 26, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28443664/theory-and-electrochemistry-of-cytochrome-c
#4
Salman S Seyedi, Morteza M M Waskasi, Dmitry V Matyushov
Extensive simulations of cytochrome c in solution are performed to address the apparent contradiction between large reorganization energies of protein electron transfer typically reported by atomistic simulations and much smaller values produced by protein electrochemistry. The two sets of data are reconciled by deriving the activation barrier for electrochemical reaction in terms of an effective reorganization energy composed of half the Stokes shift (characterizing the medium polarization in response to electron transfer) and the variance reorganization energy (characterizing the breadth of electrostatic fluctuations)...
April 26, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28442390/high-pressure-thermophilic-electromethanogenic-system-producing-methane-at-5%C3%A2-mpa-55%C3%A2-c
#5
Hajime Kobayashi, Ayano Nagashima, Miki Kouyama, Qian Fu, Masayuki Ikarashi, Haruo Maeda, Kozo Sato
Toward applications of bio-electrochemical systems in industrial processes and extreme environments, electromethanogenesis under high-pressure conditions was examined. Stainless-steel single-chamber reactors specifically designed to examine bio-electrochemical reactions under pressurized conditions were inoculated with thermophilic microorganisms originated from an oilfield formation water. The reactors were incubated at 5 MPa, 55°C in fed-batch operational mode with an applied voltage of 0.7 V. In the first few fed-batch cycles, hydrogen was mainly produced...
April 22, 2017: Journal of Bioscience and Bioengineering
https://www.readbyqxmd.com/read/28441470/al2o3-and-sio2-atomic-layer-deposition-layers-on-zno-photoanodes-and-degradation-mechanisms
#6
Qian Cheng, Manpuneet Kaur Benipal, Qianlang Liu, Xingye Wang, Peter A A Crozier, Candace K Chan, Robert J Nemanich
Strategies for protecting unstable semiconductors include the utilization of surface layers comprised of thin films deposited using atomic layer deposition (ALD). The protective layer is expected to: (1) be stable against reaction with photogenerated holes, (2) prevent direct contact of the unstable semiconductor with the electrolyte, and (3) prevent the migration of ions through the semiconductor/electrolyte interface, while still allowing photogenerated carriers to transport to the interface and participate in the desired redox reactions...
April 25, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28441356/a-simple-cost-effective-sensor-for-detecting-lead-ions-in-water-using-under-potential-deposited-bismuth-sub-layer-with-differential-pulse-voltammetry-dpv
#7
Yifan Dai, Chung Chiun Liu
This research has developed a simple to use, cost effective sensor system for the detection of lead ions in tap water. An under-potential deposited bismuth sub-layer on a thin gold film based electrochemical sensor was designed, manufactured, and evaluated. Differential pulse voltammetry (DPV) measurement technique was employed in this detection. Tap water from the Cleveland, OH, USA regional water district was the test medium. Concentrations of lead ion in the range of 8 × 10(-7) M to 5 × 10(-4) M were evaluated, showing a good sensitivity over this concentration range...
April 25, 2017: Sensors
https://www.readbyqxmd.com/read/28441011/synthesis-characterization-and-dft-analysis-of-bis-terpyridyl-based-molecular-cobalt-complexes
#8
Safwan Aroua, Tanya K Todorova, Paul Hommes, Lise-Marie Chamoreau, Hans-Ulrich Reissig, Victor Mougel, Marc Fontecave
Terpyridine ligands are widely used in chemistry and material sciences owing to their ability to form stable molecular complexes with a large variety of metal ions. In that context, variations of the substituents on the terpyridine ligand allow modulation of the material properties. Applying the Stille cross-coupling reaction, we prepared with good yields a new series of terpyridine ligands possessing quinoline-type moieties in ortho, meta, and para positions and dimethylamino substituents at central or distal positions...
April 25, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28440629/relevant-features-of-a-triethylene-glycol-dimethyl-ether-based-electrolyte-for-application-in-lithium-battery
#9
Lorenzo Carbone, Daniele Di Lecce, Mallory Gobet, Stephen Munoz, Matthew Devany, Steve Greenbaum, Jusef Hassoun
Triethylene glycol dimethyl ether (TREGDME) dissolving lithium trifluoromethane sulfonate (LiCF3SO3) is studied as a suitable electrolyte medium for lithium battery. Thermal and rheological characteristics, transport properties of the dissolved species, and the electrochemical behavior in lithium cell represent the most relevant investigated properties of the new electrolyte. The self-diffusion coefficients, the lithium transference numbers, the ionic conductivity, and the ion association degree of the solution are determined by pulse field gradient nuclear magnetic resonance and electrochemical impedance spectroscopy...
April 25, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28440299/a-reversible-dendrite-free-high-areal-capacity-lithium-metal-electrode
#10
Hui Wang, Masaki Matsui, Hiroko Kuwata, Hidetoshi Sonoki, Yasuaki Matsuda, Xuefu Shang, Yasuo Takeda, Osamu Yamamoto, Nobuyuki Imanishi
Reversible dendrite-free low-areal-capacity lithium metal electrodes have recently been revived, because of their pivotal role in developing beyond lithium ion batteries. However, there have been no reports of reversible dendrite-free high-areal-capacity lithium metal electrodes. Here we report on a strategy to realize unprecedented stable cycling of lithium electrodeposition/stripping with a highly desirable areal-capacity (12 mAh cm(-2)) and exceptional Coulombic efficiency (>99.98%) at high current densities (>5 mA cm(-2)) and ambient temperature using a diluted solvate ionic liquid...
April 25, 2017: Nature Communications
https://www.readbyqxmd.com/read/28437700/nanomolar-electrochemical-detection-of-caffeic-acid-in-fortified-wine-samples-based-on-gold-palladium-nanoparticles-decorated-graphene-flakes
#11
Kokulnathan Thangavelu, Nehru Raja, Shen-Ming Chen, Wei-Cheng Liao
Amalgamation of noble metal nanomaterials on graphene flakes potentially paves one way to improve their physicochemical properties. This paper deals with the simultaneous electrochemical deposition of gold and palladium nanoparticles on graphene flakes (Au/PdNPs-GRF) for the sensitive determination of caffeic acid (CA). The physiochemical properties of the prepared Au/PdNPs-GRF was characterized by using numerous analytical techniques such as scanning electron microscopy, electron dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, X-ray powder diffraction, Raman spectroscopy and electrochemical impedance spectroscopy...
April 13, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28437104/redox-active-macrocycles-for-organic-rechargeable-batteries
#12
Dong Jun Kim, Keith R Hermann, Aleksandrs Prokofjevs, Michael T Otley, Cristian Pezzato, Magdalena Owczarek, J Fraser Stoddart
Organic rechargeable batteries, composed of redox-active molecules, are emerging as candidates for the next generation of energy storage materials because of their large specific capacities, cost effectiveness, and the abundance of organic precursors, when compared with conventional lithium-ion batteries. Although redox-active molecules often display multiple redox states, precise control of a molecule's redox potential, leading to a single output voltage in a battery, remains a fundamental challenge in this popular field of research...
April 24, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28436036/oxidative-behavior-of-catechin-in-the-presence-of-inactive-dry-yeasts-a-comparison-with-sulfur-dioxide-ascorbic-acid-and-glutathione
#13
Piergiorgio Comuzzo, Rosanna Toniolo, Franco Battistutta, Marion Lizee, Rossella Svigelj, Roberto Zironi
BACKGROUND: The antioxidant capacity of an inactive dry yeast preparation (YD) was investigated by conventional analytical methods (spectrophotometry, HPLC) as well as by cyclic voltammetry (CV), in a (+)-catechin model wine and compared with certain of the most common antioxidants found in wine: sulfur dioxide, ascorbic acid and glutathione. RESULTS: Sulfur dioxide (SO2 ) was the highest performing substance in protecting (+)-catechin against browning, followed by ascorbic acid and the YD preparation...
April 24, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28435954/electrostatically-stabilized-hybrids-of-carbon-and-maghemite-nanoparticles-electrochemical-study-and-application
#14
D Baratella, M Magro, P Jakubec, E Bonaiuto, J de Almeida Roger, E Gerotto, G Zoppellaro, J Tucek, K C Safarova, R Zbořil, A Cecconello, I Willner, S Santagata, P Sambo, F Vianello
Binary hybrids have been investigated for the past few decades due to the emerging properties of nanoparticle composites. Electrostatically stabilized core-shell nanostructures composed of surface active magnetic nanoparticles (SAMNs) and differently charged carbon nanomaterials display specific electrochemical properties. In this work, a set of binary hybrids that include a new class of magnetic nanoparticles is presented and the electrochemical features of the hybrids are reported. Gallic acid derived carbon dots (GA-CDs), PEG derived graphene dots (PEG-GDs), and quaternized carbon dots (Q-CDs) characterized by different charged groups were used for the preparation of different complexes with SAMNs...
April 24, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28433872/biosynthesis-of-silver-nanoparticles-by-using-camellia-japonica-leaf-extract-for-the-electrocatalytic-reduction-of-nitrobenzene-and-photocatalytic-degradation-of-eosin-y
#15
R Karthik, Mani Govindasamy, Shen-Ming Chen, Yi-Hui Cheng, P Muthukrishnan, S Padmavathy, A Elangovan
In the present study, sphere-like silver nanoparticles (Ag-NPs) were synthesized by using Camellia japonica leaf extract and its remediation industrial pollutants such as nitrobenzene and Eosin-Y (EY). As-prepared sphere-like Ag-NPs were characterized by various analytical and spectroscopic methods such as UV-visible spectroscopy, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), High-resolution transmission electron microscopy (HR-TEM), Energy dispersive X-ray spectra (EDX), and the chemical constituents of the leaf extract were also analyzed by using Gas chromatography and Mass Spectroscopy (GC-MS)...
March 28, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28433858/reduced-graphene-oxide-chitosan-aptamer-interface-as-new-platform-for-ultrasensitive-detection-of-human-epidermal-growth-factor-receptor-2
#16
Arezoo Tabasi, Abdollah Noorbakhsh, Ensiyeh Sharifi
The present work describes an ultrasensitive electrochemical aptamer-based assay for detection of human epidermal growth factor receptor 2 protein (HER2) cancer biomarker as a model analyte. Results show that the reduced graphene oxide-chitosan (rGO-Chit) film as a suitable electrode material possesses great favorable properties including high homogeneity, good stability, large surface area and high fraction of amine groups as aptamer binding sites. Various steps of aptasensor fabrication were characterized using microscopic, energy-dispersive X-ray spectroscopy (EDAX), Fourier transform infrared (FTIR) spectroscopy and electrochemical techniques...
April 18, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28432633/synthesis-spectral-properties-and-dft-calculations-of-new-ruthenium-ii-polypyridyl-complexes-dna-binding-affinity-and-in-vitro-cytotoxicity-activity
#17
Rajender Reddy Mallepally, Nagamani Chintakuntla, Venkat Reddy Putta, Nagasuryaprasad K, Ravi Kumar Vuradi, Madhuri P, Satyanarayana Singh S, Ramesh Kumar Chitumalla, Joonkyung Jang, Nagababu Penumaka, Satyanarayana Sirasani
In this paper a novel ligand debip (2-(4-N,N-diethylbenzenamine)1H-imidazo[4,5-f] [1, 10]phenanthroline) and its Ru(II) polypyridyl complexes [Ru(L)2(debip)](2+), (L = phen (1), bpy (2) and dmb (3)) have been synthesized and characterized by spectroscopic techniques. The DNA binding studies for all these complexes were examined by absorption, emission, quenching studies, viscosity measurements and cyclic voltammetry. The light switching properties of complexes 1-3 have been evaluated. Molecular docking, Density Functional Theory (DFT) and time dependent DFT calculations were performed...
April 22, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28432344/aptamer-based-label-free-electrochemical-biosensor-array-for-the-detection-of-total-and-glycated-hemoglobin-in-human-whole-blood
#18
Shimaa Eissa, Mohammed Zourob
The increase of the level of glucose in blood leads to an increase in the fraction of glycated hemoglobin (HbA1c). Therefore, the percentage of HbA1c in the blood can serve as a marker for the average glucose level over the past three months and thus, it can be used to diagnose diabetes. Here, we report the selection, identification and characterization of specific DNA aptamers against HbA1c- and total hemoglobin (tHb) and their integration into an electrochemical array sensing platform. High affinity and specificity aptamers were selected in vitro showing dissociation constants of 2...
April 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28431362/rna-aptamer-based-electrochemical-aptasensor-for-c-reactive-protein-detection-using-functionalized-silica-microspheres-as-immunoprobes
#19
Junchun Wang, Jinjin Guo, Junjun Zhang, Wenjuan Zhang, Yuzhong Zhang
C-reactive protein (CRP) is a widely accepted biomarker of cardiovascular disease and inflammation. In this study, a RNA aptamer-based electrochemical sandwich type aptasensor for CRP detection was described using the functionalized silica microspheres as immunoprobes. Silica microspheres (Si MSs), which have good monodispersity and uniform shape, were firstly synthesized. The silica microspheres functionlized with gold nanoparticles (Au NPs) provided large surface area for immobilizing signal molecules (Zinc ions, Zn(2+)) and antibodies (Ab)...
April 13, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28430422/gauging-donor-acceptor-properties-and-redox-stability-of-chelating-click-derived-triazoles-and-triazolylidenes-a-case-study-with-rhenium-i-complexes
#20
Lisa Suntrup, Sinja Klenk, Johannes Klein, Sebastian Sobottka, Biprajit Sarkar
Bidentate ligands containing at least one triazole or triazolylidene (mesoionic carbene, MIC) unit are extremely popular in contemporary chemistry. One reason for their popularity is the similarities as well as differences in the donor/acceptor properties that these ligands display in comparison to their pyridine or other N-heterocyclic carbene counterparts. We present here seven rhenium(I) carbonyl complexes where the bidentate ligands contain combinations of pyridine/triazole/triazolylidene. These are the first examples of rhenium(I) complexes with bidentate 1,2,3-triazol-5-ylidene-containing ligands...
April 21, 2017: Inorganic Chemistry
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