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Long Tan, Fan Yang, Mee Rahn Kim, Pandeng Li, Deepak Thrithamarassery Gangadharan, Joelle Margot, Ricardo Izquierdo, Mohamed Chaker, Dongling Ma
Due to the practical applications of polymer solar cells (PSCs), their stability recently has received increasing attention. Herein, a new strategy was developed to largely enhance the long-term and thermal stability of PSCs in air with a relatively high humidity of 50-60% without any encapsulation. In this strategy, semiconductor PbS/CdS core/shell quantum dots (QDs) were incorporated into the photoactive blend of poly(3-hexylthiophene) (P3HT) and phenyl-C61-butyric acid methyl ester (PCBM). By replacing the initial ligands of oleic acid with halide ligands on the surface of PbS/CdS QDs via solution-phase-ligand-exchange, we were able to form unusual, continuous QD networks in the film of P3HT:PCBM, which effectively stabilized the photoactive layer...
July 18, 2017: ACS Applied Materials & Interfaces
Yi Zhang, Liangjie Fu, Zhan Shu, Huaming Yang, Aidong Tang, Tao Jiang
Substitutional doping is a strategy in which atomic impurities are optionally added to a host material to promote its properties, while the geometric and electronic structure evolution of natural nanoclay mineral upon substitutional metal doping is still ambiguous. This paper first designed an efficient lanthanum (La) doping strategy for nanotubular clay (halloysite nanotube, HNT) through the dynamic equilibrium of a substitutional atom in the presence of saturated AlCl3 solution, and systematic characterization of the samples was performed...
December 2017: Nanoscale Research Letters
N Rosenlicht, C Primich, J R McQuaid, T Maloney, I Feinberg
We investigated the relationship between length and dreamlike quality in sleep mentation reports. Reports were obtained by waking subjects at sleep onset (SO) and at 5 and 10 minutes into the second (REMP2) and fourth REM periods (REMP4). Reports were recorded, transcribed, and scored blindly for total word count (TWC) and dreamlike quality as measured by a composite dream scale score (CDS). Dreamlike quality was strongly correlated with TWC; both CDS and TWC scores increased across successively later awakenings...
July 1, 2017: Archives Italiennes de Biologie
You Jung Chung, Kayoung Kim, Byung Il Lee, Chan Beum Park
The self-assembly of amyloidogenic peptides into β-sheet-rich aggregates is a general feature of many neurodegenerative diseases, including Alzheimer's disease, which signifies the need for the effective attenuation of amyloid aggregation toward alleviating amyloid-associated neurotoxicity. This study reports that photoluminescent carbon nanodots (CDs) can effectively suppress Alzheimer's β-amyloid (Aβ) self-assembly and function as a β-sheet breaker disintegrating preformed Aβ aggregates. This study synthesizes CDs using ammonium citrate through one-pot hydrothermal treatment and passivates their surface with branched polyethylenimine (bPEI)...
July 17, 2017: Small
Gan-Ping Bai, Guo-He Yan, Guo-Jian Wang, Ping Wan, Xiao-Fei Liu, Heng Wang, Rong-Hua Zhang
The present study aimed to construct a lentiviral RNA interference (RNAi) vector targeting the transforming growth factor β1 (TGFβ1) gene of rats, in order to examine its effect on silencing of the TGFβ1 gene and on the expression of collagen type 1 α1 (Col1a1) in HSC‑T6 rat hepatic stellate cells. Three RNAi sites of the TGFβ1 gene were selected according to its CDs sequence. Three pairs of small interfering RNA (siRNA) of these RNAi sites were synthesized and then transfected into HSC‑T6 cells, respectively, to confirm the optimal siRNA sequence via reverse transcription‑polymerase chain reaction analysis...
July 6, 2017: Molecular Medicine Reports
Fang Deng, Fei Zhong, Lina Zhao, Xubiao Luo, Shenglian Luo, Dionysios D Dionysiou
Octahedral CdS/SnIn4S8 nano-heterojunctions were fabricated by a facile and simple one-step in situ hydrothermal method, and the molar ratio of CdS to SnIn4S8 was optimized. The optimal (0.5:1)CdS/SnIn4S8 heterojunctions exhibit the highest visible-light photocatalytic activity with 97.1% degradation efficiency of 2-nitrophenol in 120min, which is much higher than those of individual CdS and SnIn4S8. The enhanced photocatalytic performance could be attributed to the effective separation and transfer of photogenerated charges originating from the well-matched band gap structures...
July 6, 2017: Journal of Hazardous Materials
Ilya Yakavets, Igor Yankovsky, Marie Millard, Laureline Lamy, Henri-Pierre Lassalle, Arno Wiehe, Vladimir Zorin, Lina Bezdetnaya
To be effective anticancer drugs must penetrate tissue efficiently, reaching all target population of cancer cells in a concentration sufficient to exert a therapeutic effect. This study aimed to investigate the ability of methyl-β-cyclodextrin (Me-β-CD) and 2-hydroxypropyl-β-cyclodextrin (Hp-β-CD) to alter the penetration and diffusion of temoporfin (mTHPC) in HT29 multicellular tumor spheroids. mTHPC had а nonhomogenous distribution only on the periphery of spheroids. The presence of β-CDs significantly altered the distribution of mTHPC consisting in the increase of both the depth of photosensitizer penetration and accumulation in HT29 spheroids...
July 12, 2017: International Journal of Pharmaceutics
Phillip Chung, Jean Scandlyn, Peter S Dayan, Rakesh D Mistry
BACKGROUND: Antibiotic stewardship programs (ASPs) have not been fully developed for the emergency department (ED), in part the result of the barriers characteristic of this setting. Electronic health record-based clinical decision support (EHR CDS) represents a promising strategy to implement ASPs in the ED. We aimed to determine the cultural beliefs and structural barriers and facilitators to implementation of antimicrobial stewardship in the pediatric ED using EHR CDS. METHODS: Interviews and focus groups were conducted with hospital and ED leadership, attending ED physicians, nurse practitioners, physician assistants, and residents at a single health system in Colorado...
July 12, 2017: American Journal of Infection Control
Iker Iñarritu, Eduardo Torres, Antonio Topete, José Campos-Terán
The potential use of hybrid nanomaterials based on inorganic optically active nanoparticles known as quantum dots (QDs) and horseradish peroxidase (HRP) has been proposed by several authors as light-controllable nanocatalyzers, moreover, the immobilization within or over silica based supports represents an advantage over bulk-dispersed systems. However, the implications of the immobilization of such hybrid photoactivatable catalyzing systems have not been clarified with detail. Here, we present a thorough study of the functional photoactive efficiency and recycling of immobilized CdS QDs and HRP systems with different configurations, immobilized over silanized silica quartz crystal microbalance (QCM) sensors, allowing an accurate measure of the immobilized mass of each component and its correlation with the initial reaction rate of conversion of Amplex Red (AR) to resorufin...
July 6, 2017: Journal of Colloid and Interface Science
Tameem Khuder, Norsiah Yunus, Eshamsul Sulaiman, Ali Dabbagh
Denture fracture is a common clinical complication caused by improper material selection, design, or fabrication technique. This study aimed to investigate the effect of two attachment systems on fracture risk of the implant-overdentures (IOD) via finite element analysis (FEA), using the force distributions obtained from patients' occlusal analyses and to compare the obtained results with the clinical complications associated with these attachments. A three-dimensional jaw model comprised of the edentulous bones was constructed...
July 4, 2017: Journal of the Mechanical Behavior of Biomedical Materials
B Habibu, H J Makun, L S Yaqub, H U Buhari, T Aluwong, M U Kawu
Haematological parameters and erythrocyte osmotic fragility (EOF) are commonly used as indicators of health status and erythrocyte membrane integrity. Variations in haematological parameters and EOF in late gestation and early lactation during the cold-dry (CDS), hot-dry (HDS) and rainy (RAS) seasons were studied in sixty (n = 60) Red Sokoto goats (20 goats for each season). The ambient temperatures and temperature-humidity index recorded were higher in the afternoon hours of the HDS and RAS, but lower in the morning hours of the CDS as compared with the thermoneutral zone of goats...
September 1, 2017: Theriogenology
Xinyue Liu, Yixuan Liu, Shu Xu, Chong Geng, Yangyang Xie, Zi-Hui Zhang, Yonghui Zhang, Wengang Wayne Bi
We report on the formation of a "steady size" state for the growth of CdSe and CdS quantum dots (QDs), in which the size of the QDs remains constant and independent of reaction time. Kinetic study reveals that this state exists only when the amount of coordinating ligands is within a range between NS and NV+NS. NS and NV represent the amount of atoms on the surface of the QDs and the total amount of atoms in the QDs, respectively. Under this condition, the size R of the QDs can be controlled solely by the reaction temperature T with a relationship of 1/R(2)~T...
July 14, 2017: Journal of Physical Chemistry Letters
Shuai Han, Ting Wang, Li Yang, Bin Li
Bio-based hydrogel containing cyclodextrins (CDs) is of a promising polymer material that could display many advantages including wide availability, sustainability, biocompatibility and biodegradability, especially the inherent encapsulation ability with hydrophobic substance. To obtain these, the electrostatic and host-guest interactions were introduced and a hydrogel with three-dimensional double network structures was built. For preparing a spherical biopolymer cage, hydroxyethyl cellulose (HEC) and modified chitosan (HACC) were cross-linked by a one-pot reaction...
July 10, 2017: International Journal of Biological Macromolecules
Fahmy A Mamuya, Dongping Xie, Lei Lei, Ming Huang, Kenji Tsuji, Diane E Capen, Baoxue Yang, Ralph Weissleder, Teodor G Păunescu, Hua Jenny Lu
The renal collecting duct (CD) contains two major cell types, intercalated (ICs) and principal cells (PCs). A previous report showed that deletion of β-1 integrin in the entire renal CD causes defective CD morphogenesis resulting in kidney dysfunction. However, subsequent deletion of β-1 integrin specifically in ICs, and PCs respectively did not cause any morphological defects in the CDs. The discrepancy between these studies prompts us to reinvestigate the role of β-1 integrin in CD cells, specifically in the PCs...
July 12, 2017: American Journal of Physiology. Renal Physiology
Guilherme Rodrigues Teodoro, Aline Vidal Lacerda Gontijo, Aline Chiodi Borges, Márcia Hiromi Tanaka, Gabriela de Morais Gouvêa Lima, Marcos José Salvador, Cristiane Yumi Koga-Ito
The aim of this study was to increase the solubility of gallic acid (GA) for the treatment of Candida albicans biofilm, which is very difficult to treat and requires high drug concentrations. Cyclodextrins (CDs) were used for this purpose. Complexes were evaluated by phase-solubility studies, prepared by spray drying and characterized by drug loading, scanning electron microscopy (SEM) and differential scanning calorimetry (DSC). The complexes were tested on C. albicans biofilm using in vitro and in vivo models...
2017: PloS One
R Speeckaert, M Speeckaert, S De Schepper, N van Geel
The pathophysiology of vitiligo is complex although recent research has discovered several markers which are linked to vitiligo and associated with disease activity. Besides providing insights into the driving mechanisms of vitiligo, these findings could reveal potential biomarkers. Activity markers can be used to monitor disease activity in clinical trials and may also be useful in daily practice. The aim of this systematic review was to document which factors have been associated with vitiligo activity in skin and blood...
July 8, 2017: Autoimmunity Reviews
Jun Wang, Shurong Liu, Yannan Mu, Li Liu, Runa A, Jiandong Yang, Guijie Zhu, Xianwei Meng, Wuyou Fu, Haibin Yang
Vertically aligned CdTe nanorods (NRs) arrays are successfully grown by a simple one-step and template-free electrodeposition method, and then embedded in the CdS window layer to form a novel three-dimensional (3D) heterostructure on flexible substrates. The parameters of electrodeposition such as deposition potential and pH of the solution are varied to analyze their important role in the formation of high quality CdTe NRs arrays. The photovoltaic conversion efficiency of the solar cell based on the 3D heterojunction structure is studied in detail...
July 3, 2017: Journal of Colloid and Interface Science
Greta Avm Geerts
PURPOSE: The objective of this trial was to compare short-term patient preference for two mandibular complete denture (CD) fabrication techniques: neutral zone (NZ) and conventional (CV). MATERIALS AND METHODS: A prospective, within-subject, randomized crossover trial was performed on a sample of 37 edentulous patients with complete denture experience. Two new sets of CDs were made for each patient, one set with a CV and one with a NZ mandibular denture. After consecutively wearing each set for at least 2 months after the last adjustment visit, patients indicated their preference (CV, NZ, or none)...
July 2017: International Journal of Prosthodontics
Dandan Ma, Jian-Wen Shi, Yajun Zou, Zhaoyang Fan, Xin Ji, Chunming Niu
A novel CdS/ZnO heterojunction constructed by zero-dimensional (0D) CdS quantum dots (QDs) and two-dimensional (2D) ZnO nanosheets (NSs) was rationally designed for the first time. The 2D ZnO NSs were assembled into ZnO microflowers (MFs) via an ultrasonic-assisted hydrothermal procedure (100 ℃, 12 h) in the presence of NaOH solution (0.06 M), and CdS QDs were deposited on both sides of every ZnO nanosheet in-situ by using the successive ionic layer absorption and reaction method. It was found that the ultrasonic treatment played an important role in the generation of ZnO NSs, while NaOH was responsible to the assembly of flower-like structure...
July 11, 2017: ACS Applied Materials & Interfaces
Shundong Guan, Xiuli Fu, Ying Tang, Zhijian Peng
Novel AuAg@CdS double-walled nanotubes (DWNTs) were successfully fabricated through a three-step solvothermal method, starting with silver nanowires as the template. In the DWNTs, a uniform layer of a CdS shell is coated onto the AuAg nanotubes, finally forming the one-dimensional nanocomposites. Nonlinear optical analysis indicated that the plasmon-exciton interaction in the AuAg@CdS DWNTs induced an obviously saturated absorption response under visible light excitation, in contrast to individual AuAg nanotubes and CdS shells...
July 11, 2017: Nanoscale
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