Read by QxMD icon Read


Xiao-Mei Shi, Gao-Chao Fan, Xueying Tang, Qingming Shen, Jun-Jie Zhu
Sensitive and specific detection of DNA is of great significance for clinical diagnosis. In this paper, an effective cascade signal amplification strategy was introduced into photoelectrochemical (PEC) biosensor for ultrasensitive detection of human T-cell lymphotropic virus type I (HTLV-I) DNA. This proposed signal amplification strategy integrates λ-exonuclease (λ-Exo) aided target recycling with hybridization chain reaction (HCR) and enzyme catalysis. In the presence of target DNA (tDNA) of HTLV-I, the designed hairpin DNA (h1 DNA) hybridized with tDNA, subsequently recognized and cleaved by λ-Exo to set free tDNA...
March 13, 2018: Biosensors & Bioelectronics
Md Saiful Islam, M Belal Hossain, Abdul Matin, Md Shafiqul Islam Sarker
Heavy metal pollution in sediment resources may pose serious threat to ecosystem and human health through food web. In this study, surface sediment samples of 10 stations along the Feni River estuary were analyzed to profile the accumulation, sources and pollution levels of heavy metals. The results revealed that the average contents (μg g-1 ) of eight selected heavy metals followed the order of Mn (37.85) > Cr (35.28) > Ni (33.27) > Co (31.02) > Pb (6.47) > Ag (1.09) > As (0...
March 13, 2018: Chemosphere
Martin Davi, Markus Mann, Zili Ma, Felix Schrader, Andreas Drichel, Serhiy Budnyk, Anna Rokicinska, Piotr Kustrowski, Richard Dronskowski, Adam Slabon
CuWO4 is a photoanode candidate in neutral pH, and manganese-based oxygen evolution reaction electrocatalysts are of high interest due to their low price and low toxicity. Considering the unexplored chemistry of transition-metal carbodiimides/cyanamides for the PEC water oxidation, we investigated MnNCN as an electrocatalyst for CuWO4 under AM 1.5G illumination in potassium phosphate electrolyte (pH 7). Surface functionalization of CuWO4 photoanodes with MnNCN increased the photocurrent from 22 to 30 μA cm-2 at 1...
March 19, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Malkeshkumar Patel, Joondong Kim
The data presented in this article are related to the research article entitled "CuO photocathode-embedded semitransparent photoelectrochemical cell" (Patel et al., 2016) [1]. This article describes the growth of Cu oxides films using reactive sputtering and application of CuO photocathode in semitransparent photoelectrochemical cell (PEC). In this data article, physical, optical and electrical properties, and PEC performances data set of the reactively sputtered semitransparent CuO samples are made publicly available to enable extended analyses...
April 2018: Data in Brief
Geeta Kumari Wasupalli, Devendra Verma
We report here the self-assembled structures of polyelectrolyte complexes (PECs) of polyanionic sodium alginate with the polycationic chitosan at room temperature. The PECs prepared at different pH values exhibited two distinct morphologies. The chitosan-alginate PECs self-assembled into the fibrous structure in a low pH range of pH 3 to 7. The PECs obtained at high pH series around pH 8 and above resulted in the formation of colloidal nanoparticles in the range of 120 ± 9.48 nm to 46.02 ± 16...
March 15, 2018: International Journal of Biological Macromolecules
Emily E Burns, Laura J Carter, Dana W Kolpin, Jane Thomas-Oates, Alistair B A Boxall
Many studies have quantified pharmaceuticals in the environment, few however, have incorporated detailed temporal and spatial variability due to associated costs in terms of time and materials. Here, we target 33 physico-chemically diverse pharmaceuticals in a spatiotemporal exposure study into the occurrence of pharmaceuticals in the wastewater system and the Rivers Ouse and Foss (two diverse river systems) in the city of York, UK. Removal rates in two of the WWTPs sampled (a conventional activated sludge (CAS) and trickling filter plant) ranged from not eliminated (carbamazepine) to >99% (paracetamol)...
March 3, 2018: Water Research
Hao Huang, Xiaohui Ren, Zhongjun Li, Huide Wang, Zongyu Huang, Hui Qiao, Pinghua Tang, Jinlai Zhao, Weiyuan Liang, Yanqi Ge, Jie Liu, Jianqing Li, Xiang Qi, Han Zhang
Two dimensional (2D) Bi nano-sheets had been employed to fabricate electrodes for broadband photo-detection. A series of characterization techniques including SEM and HRTEM verify that Bi nanosheets with intact lamellar structure have been obtained after facile liquid phase exfoliation. In the meanwhile, UV-Vis and Raman spectra are also carried out and confirm the inherent optical and physical properties of Bi nanosheets. Inherited from the topological characteristics of Bi bulk counterpart, the resultant Bi nanosheet-based photo-detector exhibits preferable photo-response activity as well as environmental robustness...
March 15, 2018: Nanotechnology
Shabeeb Hussain, Mohammad Mahdi Tavakoli, Aashir Waleed, Umar Siddique Virk, Shihe Yang, Amir Waseem, Zhiyong Fan, Muhammad Arif Nadeem
We demonstrate for the first time the application of p-NiFe2 O4 /n-Fe2 O3 composite thin films as anode materials for light-assisted electrolysis of water. The p-NiFe2 O4 /n-Fe2 O3 composite thin films were deposited on planar fluorinated tin oxide (FTO)-coated glass as well as on 3D array of nanospike (NSP) substrates. The effect of substrate (planar FTO and 3D-NSP) and percentage change of each component (i.e., NiFe2 O4 and Fe2 O3 ) of composite was studied on photoelectrochemical (PEC) water oxidation reaction...
March 14, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Xiao-Mei Shi, Li-Ping Mei, Qian Wang, Wei-Wei Zhao, Jing-Juan Xu, Hong-Yuan Chen
We report herein the energy transfer (ET) between semiconducting polymer dots (Pdots) and gold nanoparticles (Au NPs) in a photoelectrochemical (PEC) system and its feasibility for cathodic bioanalysis application. Specifically, COOH-capped Pdots were first fabricated and then assembled onto the indium-tin oxide (ITO) surface, followed by the modification of single-strand (ss) DNA probe (pDNA). After the DNA hybridization with the Au NP-tethered complementary ssDNA (Au NP-tDNA), the Au NPs were brought into the close proximity of Pdots...
March 13, 2018: Analytical Chemistry
Wenzhuo Wu, Cong Wei, Xiangcheng Lin, Qun Xu
As a promising non-precious metal photoelectrochemical (PEC) catalyst, MoS2 exhibits high electrocatalytic activity and stability, while the weak light absorption efficiency and low photoresponse current limit its practical application. Herein, a facile coassembly approach was proposed to construct the porphyrin-MoS2 composite photoelectrocatalysts. The as-prepared photoelectro-catalysts show significantly enhanced photocurrent response as high as 16 μA cm-2, which is about 2 times higher than that of bare MoS2...
March 12, 2018: Chemistry, An Asian Journal
Mohammad Mahdi Tavakoli, Fabrizio Giordano, Shaik M Zakeeruddin, Michael Grätzel
The solar to electric power conversion efficiency (PCE) of perovskite solar cells (PSCs) has recently reached 22.7 % exceeding that of competing thin film photovoltaics and the market leader polycrystalline silicon. Further augmentation of the PCE towards the Shockley-Queisser limit of 33.5 % warrants suppression of radiationless carrier recombination by judicious engineering of the interface between the light harvesting perovskite and the charge carrier extraction layers. Here, we introduce a mesoscopic oxide double layer as electron selective contact consisting of a scaffold of TiO2 nanoparticles covered by a thin film of SnO2, either in amorphous (a-SnO2), crystalline (c-SnO2) or nanocrystalline (quantum dot) form (SnO2-NC)...
March 12, 2018: Nano Letters
Jun Arimoto, Takuma Higurashi, Shingo Kato, Akiko Fuyuki, Hidenori Ohkubo, Takashi Nonaka, Yoshikazu Yamaguchi, Keiichi Ashikari, Hideyuki Chiba, Shungo Goto, Masataka Taguri, Takashi Sakaguchi, Kazuhiro Atsukawa, Atsushi Nakajima
Background and study aims:  Colorectal cancer (CRC) is one of the most common neoplasms and endoscopic submucosal dissection (ESD) is an effective treatment for early-stage CRC. However, it has been observed that patients undergoing ESD often complain of pain, even if ESD has been successfully performed. Risk factors for such pain still remain unknown. The aim of this study was to explore the risk factors for post-colorectal ESD coagulation syndrome (PECS). Patients and methods : This was a prospective multicenter observational trial (UMIN000016781) conducted in 106 of 223 patients who underwent ESD between March 2015 and April 2016...
March 2018: Endoscopy International Open
Jéssica G Martins, Ariel C de Oliveira, Patrícia S Garcia, Matt J Kipper, Alessandro F Martins
Processing water-soluble polysaccharides, like pectin (PT), into materials with desirable stability and mechanical properties has been challenging. Here we report a new method to create water stable and mechanical resistant polyelectrolyte complex (PEC) membranes from PT and chitosan (CS) assemblies, without covalent crosslinking. This new method overcomes challenges of obtaining stable and durable complexes, by performing the complexation at low pH, enabling complex formation even when using an excess of PT, and when using PT with high degree of O-methoxylation...
May 15, 2018: Carbohydrate Polymers
Yanxue Liu, Kefeng Liu, Xiaomin Li, Shangzhen Xiao, Dan Zheng, Pengbo Zhu, Chunxiao Li, Jing Liu, Jing He, Jiandu Lei, Luying Wang
The application of non-toxic carriers to increase drug loading, multi-drug delivery, and extremely small size of nano-drugs to construct a tremendous transmission system is the goal for all researchers to be pursued. The proposal of natural pectin nano-platform for delivery of multiple drugs is critical for biomedical research, especially a particle size of below 100nm with high yield. Here we design a new core-shell structure pectin-eight-arm polyethylene glycol-ursolic acid/hydrooxycampothecin nanoparticle (Pec-8PUH NPs) through a special self-assembly method for stabilizing and dispersing particles, improving water-solubility, and achieving drug controlled release...
May 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
Yu-Ting Gong, Fang Yuan, Yuming Dong, Zaijun Li, Guang-Li Wang
A novel and general strategy of split-type immunoassay is developed based on redox chemical reaction modulated photoelectrochemistry of carbon dots (CDs). Specifically, the photocurrent of the CDs sensitized titanium dioxide nanoparticles (TiO2 NPs) modified fluorine doped indium tin oxide (FTO) (that is the FTO/TiO2 /CDs) electrode was inhibited obviously by KMnO4 due to the oxidation of surface hydroxyl groups of CDs to electron accepting carbonyls. While the inhibited photocurrent of the KMnO4 treated FTO/TiO2 /CDs electrode can be restored by ascorbic acid (AA) because of the regeneration of electron donating hydroxyls to promote electron-hole separation...
July 19, 2018: Analytica Chimica Acta
Haiyan Wang, Huanshun Yin, Hua Huang, Kelin Li, Yunlei Zhou, Geoffrey I N Waterhouse, Hai Lin, Shiyun Ai
Herein, a novel dual-signal amplified photoelectrochemical (PEC) biosensor was successfully developed for the highly selective detection of N6 -methyladenosine (m6 A) methylated RNA. The PEC biosensor comprised BiVO4 -110-TiO2 heterojunction and gold nanoparticle decorated MoS2 (MoS2 -AuNPs) as the photoactive materials, horseradish peroxidase conjugated biotin (HRP-Biotin) as the enzymatic unit, Ag+ -mediated cytosine pairs (C-Ag+ -C) as the signal amplification unit, and the anti-m6 A antibody as the m6 A methylated RNA recognition unit...
February 27, 2018: Biosensors & Bioelectronics
Nina Fu, Yue Hu, Saihua Shi, Shaokang Ren, Wei Liu, Shao Su, Baomin Zhao, Lixing Weng, Lianhui Wang
MiRNAs are small regulatory RNAs that play crucial roles in the oncogenic state in various cancers and have shown highly promising clinical applications as plasma-based markers for cancer classification and prognostication. Due to their electroanalytical advantages, photoelectrochemical biosensors are a very attractive alternative technology for miRNA sensing and detection. In this work, we demonstrated a novel photoelectrochemical (PEC) sensor using the in situ grown Au nanoparticles/two-dimensional molybdenum disulfide (MoS2 ) nanosheet heterojunction (MoS2 -AuNPs) on ITO glass as the photoanode (MoS2 -AuNPs/ITO)...
March 8, 2018: Analyst
Jesús Martínez-Cruz, Diego F Romero, Fernando de la Torre, Dolores Fernández-Ortuño, Juan Antonio Torés, Antonio de Vicente, Alejandro Perez-Garcia
Podosphaera xanthii is the main causal agent of powdery mildew disease in cucurbits. In a previous study, we determined that P. xanthii expresses approximately 50 Podosphaera effector candidates (PECs), identified based on the presence of a predicted signal peptide and the absence of functional annotation. In this work, we used host-induced gene silencing (HIGS), employing Agrobacterium tumefaciens as a vector for the delivery of the silencing constructs (ATM-HIGS), to identify genes involved in early plant-pathogen interaction...
March 7, 2018: Molecular Plant-microbe Interactions: MPMI
Qian Wang, Yi-Fan Ruan, Wei-Wei Zhao, Peng Lin, Jing-Juan Xu, Hong-Yuan Chen
In this study, semiconducting organic polymer dots (Pdots) and inorganic quantum dots (Qdots) were firstly utilized to construct the organic-inorganic nanodots heterojunction for the photoelectrochemical (PEC) bioanalysis application. Specifically, n-type CdS Qdots, p-type CdTe Qdots and tetraphenylporphyrin (TPP)-doped poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-(1,4-benzo-{2,1',3}-thiadazole)] (PFBT) Pdots were fabricated and their energy levels, i.e., their valence band (VB)/conduction band (CB) or lowest unoccupied molecular orbital (LUMO)/highest occupied molecular orbital (HOMO) values, were also determined...
March 5, 2018: Analytical Chemistry
Neil L Rose, Simon D Turner, Handong Yang, Congqiao Yang, Charlotte Hall, Stuart Harrad
'Real-world' contaminant exposure of sediment-dwelling biota is typically long-term, low-level and to multiple pollutants. However, sediment quality guidelines, designed to protect these organisms, relate only to single contaminants. This study uses radiometrically dated sediment cores from 7 English lakes with varying contamination histories to reconstruct temporal changes in likely risk to biota (herein termed 'palaeotoxicity'). The Probable Effects Concentration Quotient (PEC-Q) approach was used to combine sediment concentrations from multiple contaminants (trace metals; PCBs; PBDEs) to determine risk allocated to metals and persistent organic pollutants (POPs) separately as well as combined (PEC-Q Mean-All)...
March 2, 2018: Environmental Geochemistry and Health
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"