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https://www.readbyqxmd.com/read/28425125/n-methyl-4-pyridinium-tetrazolate-zwitterion-based-photochromic-materials
#1
Xiang-Yi Chen, Ning-Ning Zhang, Li-Zhen Cai, Pei-Xin Li, Ming-Sheng Wang, Guo-Cong Guo
N,N'-disubstituted bipyridinium (viologen) and N-monosubstituted bipyridinium compounds are well known for their electron-transfer (ET) photochromic behavior. The modification of them was exclusively focused on the N-substituents. For the first time, we studied the photochromic behavior when one pyridyl ring of the bipyridinium was substituted with a multi-functional azole group, and revealed that two new coordination compounds based on N-methyl-4-pyridinium tetrazolate (mptz) zwitterion, [Zn(mptz)2Br2] (1) and [Cd3(mptz)2Cl6]n∙4nH2O (2), exhibit typical ET photochromic behavior owing to photoinduced ET from halogen anion to the mptz ligand...
April 20, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28424946/preparation-and-corrosion-resistance-of-magnesium-phytic-acid-hydroxyapatite-composite-coatings-on-biodegradable-az31-magnesium-alloy
#2
Min Zhang, Shu Cai, Feiyang Zhang, Guohua Xu, Fengwu Wang, Nian Yu, Xiaodong Wu
In this work, a magnesium phytic acid/hydroxyapatite composite coating was successfully prepared on AZ31 magnesium alloy substrate by chemical conversion deposition technology with the aim of improving its corrosion resistance and bioactivity. The influence of hydroxyapatite (HA) content on the microstructure and corrosion resistance of the coatings was investigated. The results showed that with the increase of HA content in phytic acid solution, the cracks on the surface of the coatings gradually reduced, which subsequently improved the corrosion resistance of these coated magnesium alloy...
June 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28423948/fermentation-at-non-conventional-conditions-in-food-and-bio-sciences-by-the-application-of-advanced-processing-technologies
#3
Maria J Mota, Rita P Lopes, Mohamed Koubaa, Shahin Roohinejad, Francisco J Barba, Ivonne Delgadillo, Jorge A Saraiva
The interest in improving the yield and productivity values of relevant microbial fermentations is an increasingly important issue for the scientific community. Therefore, several strategies have been tested for the stimulation of microbial growth and manipulation of their metabolic behavior. One promising approach involves the performance of fermentative processes during non-conventional conditions, which includes high pressure (HP), electric fields (EF) and ultrasound (US). These advanced technologies are usually applied for microbial inactivation in the context of food processing...
April 20, 2017: Critical Reviews in Biotechnology
https://www.readbyqxmd.com/read/28423861/a-digital-framework-to-support-providers-and-patients-in-diabetes-related-behavior-modification
#4
Samina Abidi, Michael Vallis, Helena Piccinini-Vallis, Syed Ali Imran, Syed Sibte Raza Abidi
We present Diabetes Web-Centric Information and Support Environment (D-WISE) that features: (a) Decision support tool to assist family physicians to administer Behavior Modification (BM) strategies to patients; and (b) Patient BM application that offers BM strategies and motivational interventions to engage patients. We take a knowledge management approach, using semantic web technologies, to model the social cognition theory constructs, Canadian diabetes guidelines and BM protocols used locally, in terms of a BM ontology that drives the BM decision support to physicians and BM strategy adherence monitoring and messaging to patients...
2017: Studies in Health Technology and Informatics
https://www.readbyqxmd.com/read/28422818/inhibition-of-metabotropic-glutamate-receptor-subtype-1-alters-the-excitability-of-the-commissural-pyramidal-neuron-in-the-rat-anterior-cingulate-cortex-after-chronic-constriction-injury-to-the-sciatic-nerve
#5
Shi-Hao Gao, Lin-Lin Shen, Hui-Zhong Wen, Yan-Dong Zhao, Huai-Zhen Ruan
BACKGROUND: Inhibition of the metabotropic glutamate receptor subtype 1 in the anterior cingulate cortex has an analgesic effect during sustained nociceptive hypersensitivity. However, the specific changes in different subtypes of anterior cingulate cortex layer 5 pyramidal neurons, as well as the distinct effect of metabotropic glutamate receptor subtype 1 inhibition on different neuronal subtypes, have not been well studied. METHODS: Retrograde labeling combined with immunofluorescence, whole cell clamp recording, and behavioral tests combined with RNA interference were performed in a rat model of chronic constriction injury to the sciatic nerve...
April 19, 2017: Anesthesiology
https://www.readbyqxmd.com/read/28421736/enhancing-the-bioactivity-of-yttria-stabilized-tetragonal-zirconia-ceramics-via-grain-boundary-activation
#6
Jinhuan Ke, Jiandong Ye, Fupo He
Yttria-stabilized tetragonal zirconia (Y-TZP) has been proposed as a potential dental implant due to its good biocompatibility, excellent mechanical properties, and distinctive aesthetic effect. However, Y-TZP cannot form chemical bonds with bone tissue because of its biological inertness, which affects the reliability and long-term efficacy of Y-TZP implants. In this study, to improve the bioactivity of Y-TZP ceramics while maintaining their good mechanical performance, Y-TZP was modified by grain boundary activation via the infiltration of a bioactive glass (BG) sol into the surface layer of Y-TZP ceramics under different negative pressures (atmospheric pressure, -0...
April 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28421671/controlled-growth-of-ch3nh3pbi3-using-a-dynamically-dispensed-spin-coating-method-improving-efficiency-with-a-reproducible-pbi2-blocking-layer
#7
Yingzhuang Ma, Parth Vashishtha, Kai Chen, Elijah Peach, David Ohayon, Justin Hodgkiss, Jonathan Halpert
It is commonly believed that excess PbI2 has beneficial effects for perovskite solar cells due to the modification of charge transport behavior at interfaces, by surface passivation and by blocking electron-hole recombination. Here, we introduce a dynamically dispensed spin coating technique in a two-step deposition to form a perovskite layer with controllable quantities of crystalline PbI2. Using this technique, the concentration of CH3NH3I solution is kept constant at the reaction interface, ensuring smooth growth of films...
April 19, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28421016/online-coaching-of-emotion-regulation-strategies-for-parents-efficacy-of-the-online-rational-positive-parenting-program-and-attention-bias-modification-procedures
#8
Oana A David, David Capris, Alexandra Jarda
Parenting programs are currently treatment of choice for behavioral disorders in children and one of their main components is reducing the negativity bias in the child-parent dyad. The Rational Positive Parenting Program (rPPP) is a program with a special focus on parent emotion-regulation functional reappraisal strategies, which has recently received consistent support for reducing child externalizing and internalizing disorders. In the last years, online interventions were proliferated and the Attention Bias Modification (ABM) becoming a promising implicit therapeutic intervention based on attention deployment emotion-regulation strategy, or adjunctive module to usual treatments, with results in multiple domains, varying from pain to self-esteem and emotional disorders (e...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28420731/distinct-modulatory-role-of-rna-in-the-aggregation-of-the-tumor-suppressor-protein-p53-core-domain
#9
Petar Stefanov Kovachev, Debapriya Banerjee, Luciana Pereira Rangel, Jonny Eriksson, Murilo M Pedrote, Mafalda Maria D C Martins-Dinis, Katarina Edwards, Yraima Cordeiro, Jerson L Silva, Suparna Sanyal
Inactivation of the tumor suppressor protein p53 by mutagenesis, chemical modification, protein-protein interaction or aggregation has been associated with different human cancers. Although DNA is the typical substrate of p53, numerous studies have reported p53 interactions with RNA. Here, we have examined the effects of RNA of varied sequence, length and origin on the mechanism of aggregation of the core domain of p53 (p53C) using light scattering, intrinsic fluorescence, transmission electron microscopy, thioflavin-T binding, seeding and immunoblot assays...
April 18, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28420604/a-digital-tool-to-promote-alcohol-and-drug-use-screening-brief-intervention-and-referral-to-treatment-skill-translation-a-mobile-app-development-and-randomized-controlled-trial-protocol
#10
Derek D Satre, Khanh Ly, Maria Wamsley, Alexa Curtis, Jason Satterfield
BACKGROUND: Translation of knowledge and skills from classroom settings to clinical practice is a major challenge in healthcare training, especially for behavioral interventions. For example, screening, brief intervention, and referral to treatment (SBIRT) is a highly-promoted approach to identifying and treating individuals at risk for alcohol or drug problems, yet effective, routine use of SBIRT has lagged. OBJECTIVE: The objective of this paper is to describe the development, pilot testing, and trial protocol of a mobile app based on the theory of planned behavior (TPB) to promote SBIRT skill translation and application...
April 18, 2017: JMIR Research Protocols
https://www.readbyqxmd.com/read/28418234/piezoresistive-effect-in-plasma-doping-of-graphene-sheet-for-high-performance-flexible-pressure-sensing-application
#11
M A S M Haniff, Syed Muhammad Hafiz, Nay Ming Huang, Saadah Abdul Rahman, Khairul Wahid, Mohd Ismahadi Syono, Ishak Abdul Azid
This paper presents a straightforward plasma treatment modification of graphene with an enhanced piezoresistive effect for the realization of a high-performance pressure sensor. The changes in the graphene in terms of its morphology, structure, chemical composition, and electrical properties after the NH3/ Ar plasma treatment were investigated in detail. Through a sufficient plasma treatment condition, our studies demonstrated that plasma-treated graphene (PG) sheet exhibits a significant increase in sensitivity by one order of magnitude compared to unmodified graphene (UG) sheet...
April 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28416876/comparison-of-rheological-behaviors-and-nanostructure-of-bighead-carp-scales-gelatin-modified-by-different-modification-methods
#12
Tao Huang, Zong-Cai Tu, Hui Wang, Wei Liu, Lu Zhang, Yan Zhang, Xin-Chen ShangGuan
In this study, microbial transglutaminase (MTGase) and pectin were compared to modify bighead carp (Hypophthalmichthys nobilis) scale gelatin. The functional properties of modified fish scales gelatin (FSG) were largely improved, including melting temperature and rheological behavior. While, modification methods decreased the triple-helix content and destroyed the single left-hand helix chain of modified FSG as investigated by X-ray diffraction. MTGase could induce the denser and finer gels network, but had none significant effect on nanostructural properties of fish gelatin...
April 2017: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/28415550/high-impact-of-in-situ-dextran-coating-on-biocompatibility-stability-and-magnetic-properties-of-iron-oxide-nanoparticles
#13
Zhila Shaterabadi, Gholamreza Nabiyouni, Meysam Soleymani
Biocompatible ferrofluids based on dextran coated iron oxide nanoparticles were fabricated by conventional co-precipitation method. The experimental results show that the presence of dextran in reaction medium not only causes to the appearance of superparamagnetic behavior but also results in significant suppression in saturation magnetization of dextran coated samples. These results can be attributed to size reduction originated from the role of dextran as a surfactant. Moreover, weight ratio of dextran to magnetic nanoparticles has a remarkable influence on size and magnetic properties of nanoparticles, so that the sample prepared with a higher weight ratio of dextran to nanoparticles has the smaller size and saturation magnetization compare with the other samples...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415514/synthesis-and-characterization-of-cycloaliphatic-hydrophilic-polyurethanes-modified-with-l-ascorbic-acid-as-materials-for-soft-tissue-regeneration
#14
J Kucinska-Lipka, I Gubanska, M Strankowski, H Cieśliński, N Filipowicz, H Janik
In this paper we described synthesis and characteristic of obtained hydrophilic polyurethanes (PURs) modified with ascorbic acid (commonly known as vitamin C). Such materials may find an application in the biomedical field, for example in the regenerative medicine of soft tissues, according to ascorbic acid wide influence on tissue regeneration Flora (2009), Szymańska-Pasternak et al. (2011), Taikarimi and Ibrahim (2011), Myrvik and Volk (1954), Li et al. (2001), Cursino et al. (2005) . Hydrophilic PURs were obtained with the use of amorphous α,ω-dihydroxy(ethylene-butylene adipate) (dHEBA) polyol, 1,4-butanediol (BDO) chain extender and aliphatic 4,4'-methylenebis(cyclohexyl isocyanate) (HMDI)...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415460/poly-arginine-graphene-quantum-dots-as-a-biocompatible-and-non-toxic-nanocomposite-layer-by-layer-electrochemical-preparation-characterization-and-non-invasive-malondialdehyde-sensory-application-in-exhaled-breath-condensate
#15
Mohammad Hasanzadeh, Fozieh Mokhtari, Nasrin Shadjou, Aziz Eftekhari, Ahad Mokhtarzadeh, Vahid Jouyban-Gharamaleki, Soltanali Mahboob
This study reports on the electropolymerization of a low toxic and biocompatible polymer with entitle poly arginine-graphene quantum dots (PARG-GQDs) as a novel strategy for surface modification of glassy carbon (GC) surface and preparation a new interface for biomedical application. The fabrication of PARG-GQDs on GCE was performed using Layer-by-layer regime. Scanning electron microscopy (SEM) was confirmed dispersion of GQDs on the surface of PARG which lead to increase of surface coverage of PARG. The redox behavior of prepared sensor was then characterized by cyclic voltammetry (CV), differential pulse voltammetry (DPV) and chronoamperometry (CHA), square wave voltammetry (SWV), linear sweep voltammetry (LSV)...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415397/surface-modified-bioresorbable-electrospun-scaffolds-for-improving-hemocompatibility-of-vascular-grafts
#16
Pablo C Caracciolo, María Isabel Rial-Hermida, Florencia Montini-Ballarin, Gustavo A Abraham, Angel Concheiro, Carmen Alvarez-Lorenzo
The replacement of small-diameter vessels is one of the main challenges in tissue engineering. Moreover, the surface modification of small-diameter vascular grafts (SDVG) is a key factor in the success of the therapy due to their increased thrombogenicity and infection susceptibility caused by the lack of a functional endothelium. In this work, electrospun scaffolds were prepared from blends of poly(L-lactic acid) (PLLA) and segmented polyurethane (PHD) with a composition designed to perform as SDVG inner layer...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415196/traffic-gridlock-on-a-honeycomb-city
#17
L E Olmos, J D Muñoz
Inspired by an old and almost in oblivion urban plan, we report the behavior of the Biham-Middleton-Levine (BML) model-a paradigm for studying phase transitions of traffic flow-on a hypothetical city with a perfect honeycomb street network. In contrast with the original BML model on a square lattice, the same model on a honeycomb does not show any anisotropy or intermediate states, but a single continuous phase transition between free and totally congested flow, a transition that can be completely characterized by the tools of classical percolation...
March 2017: Physical Review. E
https://www.readbyqxmd.com/read/28415050/free-radicals-and-polyphenols-the-redox-chemistry-of-neurodegenerative-diseases
#18
REVIEW
Sonia Losada-Barreiro, Carlos Bravo-Díaz
The oxidation of bioorganic materials by air and, particularly, the oxidative stress involved in the cell loss and other pathologies associated with neurodegenerative diseases (NDs) are of enormous social and economic importance. NDs generally involve free radical reactions, beginning with the formation of an initiating radical by some redox, thermal or photochemical process, causing nucleic acid, protein and lipid oxidations and the production of harmful oxidative products. Physically, persons afflicted by NDs suffer progressive loss of memory and thinking ability, mood swings, personality changes, and loss of independence...
March 29, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28414132/epigenetic-modification-of-glucocorticoid-receptor-promoter-i7-in-maternally-separated-and-restraint-stressed-rats
#19
Sung Woo Park, Jung Goo Lee, Mi Kyoung Seo, Nguyen Ngoc Ly, Chan Hong Lee, Hye Yeon Cho, Le Thi Hein, Ah Jeong Choi, Gyung-Mee Kim, Young Hoon Kim
Glucocorticoid receptor (GR) promoter I7 is susceptible to epigenetic changes induced by environmental influences. Early life stress (ELS) has a persistent impact on GR expression, as well as behavior, in adult rodents via epigenetic changes of GR promoter I7. Moreover, various stressors can induce histone modifications in this region during adulthood. Thus, the present study aimed to investigate whether maternally separated (MS) rats exposed to chronic restraint stress (RS) would exhibit histone modifications of GR promoter I7 in the hippocampus...
April 13, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28413260/missing-linkers-an-alternative-pathway-to-uio-66-electronic-structure-engineering
#20
Arthur De Vos, Kevin Hendrickx, Pascal Van Der Voort, Veronique Van Speybroeck, Kurt Lejaeghere
UiO-66 is a promising metal-organic framework for photocatalytic applications. However, the ligand-to-metal charge transfer of an excited electron is inefficient in the pristine material. Herein, we assess the influence of missing linker defects on the electronic structure of UiO-66 and discuss their ability to improve ligand-to-metal charge transfer. Using a new defect classification system, which is transparent and easily extendable, we identify the most promising photocatalysts by considering both relative stability and electronic structure...
April 11, 2017: Chemistry of Materials: a Publication of the American Chemical Society
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