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https://www.readbyqxmd.com/read/28646718/reduced-graphene-oxide-functionalized-feooh-for-signal-on-photoelectrochemical-sensing-of-prostate-specific-antigen-with-bioresponsive-controlled-release-system
#1
Qian Zhou, Youxiu Lin, Jian Shu, Kangyao Zhang, Zhenzhong Yu, Dianping Tang
A new and signal-on photoelectrochemical (PEC) sensing platform was successfully designed for the sensitive detection of prostate-specific antigen (PSA), using reduced graphene oxide- functionalized iron oxyhydroxide (FeOOH-rGO) as the photoactive material, accompanying target-responsive controlled release system to achieve the signal amplification. Introduction of rGO as electron mediator greatly facilitated the electron transfer from FeOOH to electrode under visible light, which inhibited the electron-hole recombination to enhance the photo-activity of FeOOH-rGO...
June 16, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28644493/photoelectrochemical-devices-for-solar-water-splitting-materials-and-challenges
#2
Chaoran Jiang, Savio J A Moniz, Aiqin Wang, Tao Zhang, Junwang Tang
It is widely accepted within the community that to achieve a sustainable society with an energy mix primarily based on solar energy we need an efficient strategy to convert and store sunlight into chemical fuels. A photoelectrochemical (PEC) device would therefore play a key role in offering the possibility of carbon-neutral solar fuel production through artificial photosynthesis. The past five years have seen a surge in the development of promising semiconductor materials. In addition, low-cost earth-abundant co-catalysts are ubiquitous in their employment in water splitting cells due to the sluggish kinetics of the oxygen evolution reaction (OER)...
June 23, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28640586/self-supported-bi2moo6-nanowall-for-photoelectrochemical-water-splitting
#3
Minghong Wu, Yuxi Wang, Yang Xu, Jie Ming, Min Zhou, Rui Xu, Qun Fu, Yong Lei
Nanowall has been regarded as a promising architecture for highly efficient photoelectrochemical (PEC) water splitting due to various superiorities, such as open geometry, highly reactive facets, independent contact with current collector etc. Here, vertically aligned Bi2MoO6 nanosheet array, which is also called nanowall, is first achieved directly on the ITO glass by a facile solvothermal approach. The structural features not only offer multiple superiorities for PEC processes, and also provide the bridge for in-depth insights of intrinsic features of Bi2MoO6 photoanodes...
June 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28629045/chitosan-based-in-situ-forming-polyelectrolyte-complexes-a-potential-sustained-drug-delivery-polymeric-carrier-for-high-dose-drugs
#4
Niharika Lal, Juhi Dubey, Praveen Gaur, Navneet Verma, Anurag Verma
The present study investigated the feasibility of using combination of Cationic and anionic polymers as sustained release carrier for the delivery of high dose gastric acid soluble model drug Paracetamol. Various formulations were prepared using wet granulation technique. Briefly a cooled (4°C) neutral solution of chitosan (CH) was combined with cooled aqueous solution (4°C) of anionic polymer such as Gum Ghatti (GG) and Xanthan gum (XG). This polyelectrolyte solution was then used to granulate the model drug Paracetamol...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28628866/anticancer-drugs-consumption-trends-in-spain-prediction-of-environmental-concentrations-and-potential-risks
#5
Helena Franquet-Griell, Cristian Gómez-Canela, Francesc Ventura, Silvia Lacorte
This study presents the occurrence and impact of 78 anticancer drugs in Spanish river basins based on consumption data in pharmacies during the period 2010-2015 and calculation of the predicted environmental concentrations (PEC). The total consumption of anticancer drugs in Spanish pharmacies was of 23.4 tons in 2015, being mycophenolic acid and hydroxycarbamide the drugs with the highest prescription. Their PECs in river at national scale were up to 80 ng/L. However, the use of different dilution factors revealed major differences between hydrographic basins, and PECriver rose up to 68,014 ng/L in highly populated rivers with low flows...
June 16, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28628814/a-critical-evaluation-of-different-parameters-for-estimating-pharmaceutical-exposure-seeking-an-improved-environmental-risk-assessment
#6
André M P T Pereira, Liliana J G Silva, Celeste M Lino, Leonor M Meisel, Angelina Pena
A critical evaluation of the European Medicines Agency (EMA) Guideline on Environmental Risk Assessment (ERA) was performed on 16 of Portugal's most consumed pharmaceuticals in wastewater effluents (WWEs), the main route for aquatic contamination. The predicted environmental concentrations (PECs) were formulated based on the Guideline, after incorporating several refinements. The best approach was selected by comparing the measured environmental concentrations (MECs) to the PECs in WWEs. Finally, risk was assessed by comparing PECs to predicted no-effect concentrations (PNECs)...
June 16, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28628273/exposure-of-induced-pluripotent-stem-cell-derived-vascular-endothelial-and-smooth-muscle-cells-in-coculture-to-hemodynamics-induces-primary-vascular-cell-like-phenotypes
#7
Maria S Collado, Banumathi K Cole, Robert A Figler, Mark Lawson, David Manka, Michael B Simmers, Steve Hoang, Felipe Serrano, Brett R Blackman, Sanjay Sinha, Brian R Wamhoff
Human induced pluripotent stem cells (iPSCs) can be differentiated into vascular endothelial (iEC) and smooth muscle (iSMC) cells. However, because iECs and iSMCs are not derived from an intact blood vessel, they represent an immature phenotype. Hemodynamics and heterotypic cell:cell communication play important roles in vascular cell phenotypic modulation. Here we tested the hypothesis that hemodynamic exposure of iECs in coculture with iSMCs induces an in vivo-like phenotype. iECs and iSMCs were cocultured under vascular region-specific blood flow hemodynamics, and compared to hemodynamic cocultures of blood vessel-derived endothelial (pEC) and smooth muscle (pSMC) cells...
June 19, 2017: Stem Cells Translational Medicine
https://www.readbyqxmd.com/read/28625445/prospective-double-blind-randomized-placebo-controlled-clinical-trial-of-the-pectoral-nerves-pecs-block-type-ii
#8
Barbara Versyck, Geert-Jan van Geffen, Patrick Van Houwe
STUDY OBJECTIVE: The aim of this clinical trial was to test the hypothesis whether adding the pectoral nerves (Pecs) block type II to the anesthetic procedure reduces opioid consumption during and after breast surgery. DESIGN: A prospective randomized double blind placebo-controlled study. SETTING: A secondary hospital. PATIENTS: 140 breast cancer stage 1-3 patients undergoing mastectomy or tumorectomy with sentinel node or axillary node dissection...
August 2017: Journal of Clinical Anesthesia
https://www.readbyqxmd.com/read/28621518/a-photoelectrochemical-bioanalysis-platform-for-cells-monitoring-based-on-dual-signal-amplification-using-in-situ-generation-of-electron-acceptor-coupled-with-heterojunction
#9
Ruyan Li, Yue Zhang, Wenwen Tu, Zhihui Dai
Using in suit generation of electron acceptor coupled with heterojunction as dual signal amplification, a simple photoelectrochemical (PEC) bioanalysis platform was designed. The synergic effect between the PEC activities of carbon nitride (C3N4) nanosheets and PbS quantum dots (QDs) achieved almost 9 fold photocurrent intensity increment, compared with the C3N4 alone. After the G-quadruplex/hemin/Pt NPs with catalase-like activity towards H2O2 was introduced, oxygen was in situ generated and acted as electron donor, improving charge separation efficiency and further enhancing photocurrent response...
June 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28612494/enhanced-interfacial-charge-transfer-on-wo3-photoanode-by-molecular-iridium-catalyst
#10
Haili Tong, Yi Jiang, Qian Zhang, Jialing Li, Wenchao Jiang, Donghui Zhang, Na Li, Lixin Xia
The rational design of active photoanodes for photoelectrochemical (PEC) water splitting is crucial for future applications in sustainable energy conversion. A combination of catalysts with photoelectrodes is generally required to improve surface kinetics and suppress surface recombination. In this study, we present an iridium complex (Ir-PO3H2) modified WO3 photoanode (WO3+Ir-PO3H2) for PEC water oxidation. When the Ir-based molecular catalyst (Ir-PO3H2) is anchored to a WO3 electrode, the photoanode shows a significant improvement both in photocurrent and faradaic efficiency compared to bare WO3...
June 14, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28612464/recent-advances-in-bismuth-based-nanomaterials-for-photoelectrochemical-water-splitting
#11
Swhetha S M Bhat, Ho Won Jang
In recent years bismuth based nanomaterials are drawing considerable interest as potential candidates for photoelectrochemical (PEC) water splitting due to their narrow band gap, nontoxicity and low cost. The unique electronic structure with well dispersed valance band comprising of Bi 6s and O 2p orbital in the bismuth based materials offers suitable band gap to harvest visible light. This review presents the significant advancements in exploiting bismuth based materials for solar water splitting. An overview of different strategies employed and new ideas adopted to improve the PEC performance are discussed for these materials...
June 13, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28606534/ternary-polysaccharide-complexes-colloidal-drug-delivery-systems-stabilized-in-physiological-media
#12
Danjun Wu, Agathe Ensinas, Bernard Verrier, Armelle Cuvillier, Gaël Champier, Stephane Paul, Thierry Delair
Chitosan-hyaluronan (HYA) polyelectrolyte complexes (PECs) were designed to maintain their colloidal stabilities in physiological ionic strength and pH, via a new concept of ternary complexes. This strategy relied on the formation of a binary PEC between chitosan and a strong polyacid, dextran sulphate (DS) or heparin (HEP), and further functionalization with HYA. The major parameter leading to stabilized colloids was a high ratio of the degrees of polymerization of chitosan versus the strong polyacid. The process afforded either positive or negative particles when HYA was used in default or in excess (vs...
September 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28606520/alginate-chitosan-polyelectrolyte-complexes-a-comparative-study-of-the-influence-of-the-drying-step-on-physicochemical-properties
#13
G Conzatti, D Faucon, M Castel, F Ayadi, S Cavalie, A Tourrette
Polyelectrolyte complexes (PECs) based on Alginate and Chitosan were prepared for biomedical application. These two biopolymers are valuable resources for biomedical applications. In the present work, three PECs materials were produced using three different drying techniques: hot air drying, lyophilization and supercritical CO2 drying. The choice of the drying technique allowed producing different type of structures, with different porosity scale. In order to evaluate their potential as intra-abdominal wound dressings, swelling ability in various media, enzymatic resistance and drug release behavior of the resulting materials was studied...
September 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28601531/sheep-as-a-large-animal-ear-model-middle-ear-ossicular-velocities-and-intracochlear-sound-pressure
#14
Dominik Péus, Ivo Dobrev, Lukas Prochazka, Konrad Thoele, Adrian Dalbert, Andreas Boss, Nicolas Newcomb, Rudolf Probst, Christof Röösli, Jae Hoon Sim, Alexander Huber, Flurin Pfiffner
Animals are frequently used for the development and testing of new hearing devices. Dimensions of the middle ear and cochlea differ significantly between humans and commonly used animals, such as rodents or cats. The sheep cochlea is anatomically more like the human cochlea in size and number of turns. This study investigated the middle-ear ossicular velocities and intracochlear sound pressure (ICSP) in sheep temporal bones, with the aim of characterizing the sheep as an experimental model for implantable hearing devices...
June 7, 2017: Hearing Research
https://www.readbyqxmd.com/read/28594054/personality-patterns-predict-the-risk-of-antisocial-behavior-in-spanish-speaking-adolescents
#15
Miguel A Alcázar-Córcoles, Antonio Verdejo-García, José C Bouso-Sáiz, Javier Revuelta-Menéndez, Ezequiel Ramírez-Lira
INTRODUCTION: There is a renewed interest in incorporating personality variables in criminology theories in order to build models able to integrate personality variables and biological factors with psychosocial and sociocultural factors. The aim of this article is the assessment of personality dimensions that contribute to the prediction of antisocial behavior in adolescents. METHODS: For this purpose, a sample of adolescents from El Salvador, Mexico, and Spain was obtained...
May 2017: Actas Españolas de Psiquiatría
https://www.readbyqxmd.com/read/28593761/enediol-ligands-encapsulated-liposomes-enables-sensitive-immunoassay-a-proof-of-concept-for-general-liposomes-based-photoelectrochemical-bioanalysis
#16
Li-Ping Mei, Fei Liu, Jian-Bin Pan, Wei-Wei Zhao, Jing-Juan Xu, Hong-Yuan Chen
Sensitive photoelectrochemical (PEC) bioanalysis usually relies on enzyme-assisted signal amplification. This work describes the first proof-of-concept study for liposome-based PEC bioanalysis. Specifically, unilamellar liposomes were prepared and then utilized to carry the enediol-ligands and antibodies within their internal cavities and upon their external surfaces, respectively. On the other hand, the 96-well plate was used for accommodating the sandwich immunocomplexing, and then the confined liposomes were directed to release the encapsulated enediol-ligands into an individual well...
June 9, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28591651/transplantation-of-human-pancreatic-endoderm-cells-reverses-diabetes-post-transplantation-in-a-prevascularized-subcutaneous-site
#17
Andrew R Pepper, Rena Pawlick, Antonio Bruni, John Wink, Yasmin Rafiei, Doug O'Gorman, Richard Yan-Do, Boris Gala-Lopez, Tatsuya Kin, Patrick E MacDonald, A M James Shapiro
Beta-cell replacement therapy is an effective means to restore glucose homeostasis in select humans with autoimmune diabetes. The scarcity of "healthy" human donor pancreata restricts the broader application of this effective curative therapy. "β-Like" cells derived from human embryonic stem cells (hESC), with the capacity to secrete insulin in a glucose-regulated manner, have been developed in vitro, with limitless capacity for expansion. Here we report long-term diabetes correction in mice transplanted with hESC-derived pancreatic endoderm cells (PECs) in a prevascularized subcutaneous site...
June 6, 2017: Stem Cell Reports
https://www.readbyqxmd.com/read/28590562/robust-epi-nyquist-ghost-removal-by-incorporating-phase-error-correction-with-sensitivity-encoding-pec-sense
#18
Victor B Xie, Mengye Lyu, Yilong Liu, Yanqiu Feng, Ed X Wu
PURPOSE: The existing approach of Nyquist ghost correction by parallel imaging in echo planar imaging (EPI) can suffer from image noise amplification. We propose a method that estimates a phase error map from multi-channel data itself and incorporates it into the sensitivity encoding (SENSE) reconstruction for Nyquist ghost correction without compromising the image SNR. METHODS: This method first reconstructs two ghost-free images from positive and negative echoes using SENSE, respectively, from which the phase error map is computed...
June 7, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28589283/evaluation-of-focus-surface-water-pesticide-concentration-predictions-and-risk-assessment-of-field-measured-pesticide-mixtures-a-crop-based-approach-under-mediterranean-conditions
#19
Ana Santos Pereira, Michiel A Daam, Maria José Cerejeira
FOCUS models are used in the European regulatory risk assessment (RA) to predict individual pesticide concentrations in edge-of-field surface waters. The scenarios used in higher tier FOCUS simulations were mainly based on Central/North European, and work is needed to underpin the validity of simulated exposure profiles for Mediterranean agroecosystems. In addition, the RA of chemicals are traditionally evaluated on the basis of single substances although freshwater life is generally exposed to a multitude of pesticides...
June 6, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28586139/ni-ni-oh-2-core-shell-particles-partially-covering-silicon-photoanode-for-enhanced-efficiency-and-stability-of-photoelectrochemical-water-oxidation
#20
Shicheng Yan, Zhe Xu, Zhan Shi, Lang Pei, Zhengbin Gu, Zhigang Zou
One main barrier for enhancing solar energy conversion by photoelectrochemical (PEC) water splitting devices is the charge separation and transport efficiency at the interface region of the photoanode and electrolyte. Here, we electrodeposited the core-shell structured Ni@Ni(OH)2 nanoparticles on the surface of n-type Si photoanode with island distribution. We found that the Schottky barrier between Ni and Si is sensitive to the thickness of Ni(OH)2 shell. The photovoltage output of the photoanode increases with increasing the thickness of Ni(OH)2 shell, closely associating with the interaction between Ni and Ni(OH)2 that depends on the electrolyte screening effect and p-type feature of Ni(OH)2 layer...
June 6, 2017: ChemSusChem
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