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https://www.readbyqxmd.com/read/29149422/interrelationships-among-hydrogen-permeation-physiochemical-properties-and-early-adsorption-abilities-of-titanium
#1
Fang Jia, Lei Zhou, Wangxi Wu
This study aimed to investigate if the titanium samples with low hydrogen permeation which treated with a novel etching combination: phosphoric acid and sodium fluoride could influence the surface physiochemical properties and early adsorption ability. Titanium samples were treated with three different concentrations of the new formula, as groups A, B and C, and treated with the traditional etching formula, as group T. Zeta potential, contact angle, X-ray photoelectron spectroscopy (XPS) and fibronectin (FN)/vitronectin (VN) adsorption of Sprague-Dawley (SD) rat tibial osteotomies in the initial 30min and MG-63 adsorption in the initial 24 h were detected...
November 17, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/29149083/co-precipitation-synthesis-and-optical-properties-of-mn-4-doped-hexafluoroaluminate-w-led-phosphors
#2
Tim Senden, Robin G Geitenbeek, Andries Meijerink
Mn(4+)-activated hexafluoroaluminates are promising red-emitting phosphors for white light emitting diodes (w-LEDs). Here, we report the synthesis of Na₃AlF₆:Mn(4+), K₃AlF₆:Mn(4+) and K₂NaAlF₆:Mn(4+) phosphors through a simple two-step co-precipitation method. Highly monodisperse large (~20 μm) smoothed-octahedron shaped crystallites are obtained for K₂NaAlF₆:Mn(4+). The large size, regular shape and small size distribution are favorable for application in w-LEDs. All Mn(4+)-doped hexafluoroaluminates show bright red Mn(4+) luminescence under blue light excitation...
November 17, 2017: Materials
https://www.readbyqxmd.com/read/29148804/a-nanobionic-light-emitting-plant
#3
Seon-Yeong Kwak, Juan Pablo Giraldo, Min Hao Wong, Volodymyr Koman, Tedrick Lew, Jon Ell, Mark Weidman, Rosalie Sinclair, Markita P Landry, William A Tisdale, Michael S Strano
The engineering of living plants for visible light emission and sustainable illumination is compelling because plants possess independent energy generation and storage mechanisms and autonomous self-repair. Herein, we demonstrate a plant nanobionic approach that enables exceptional luminosity and lifetime utilizing four chemically-interacting nanoparticles, including firefly luciferase conjugated silica (SNP-Luc), D-luciferin releasing poly(lactic-co-glycolic acid) (PLGA-LH2), coenzyme A functionalized chitosan (CS-CoA) and semiconductor nanocrystal phosphors for longer wavelength modulation...
November 17, 2017: Nano Letters
https://www.readbyqxmd.com/read/29148736/formation-of-metal-cyanide-complexes-in-deliquescent-airborne-particles-a-new-possible-sink-for-hcn-in-urban-environments
#4
Chiara Giorio, Daniele Marton, Gianni Formenton, Andrea Tapparo
Hydrogen cyanide is a ubiquitous gas in the atmosphere and a biomass burning tracer. Reactive gasses can be adsorbed onto aerosol particles where they can promote heterogeneous chemistry. In the present study, we report for the first time on the measurement and speciation of cyanides in atmospheric aerosol. Filter samples were collected at an urban background site in the city center of Padua (Italy), extracted and analyzed with headspace gas chromatography and nitrogen-phosphorous detection. The results showed that strongly bound cyanides were present in all aerosol samples at a concentration ranging between 0...
November 17, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29148097/ce3-sensitized-tm3-mn2-doped-nayf4-colloidal-nanocrystals-intense-cool-white-light-from-phosphor-coated-uv-led
#5
Venkataramanan Mahalingam, Venkata N K B Adusumalli, Heramba V S R M Koppisetti
Intense white light emission is observed from colloidal single component NaYF4:Ce3+/Tm3+/Mn2+ nanocrystals. This combination is interesting as it uses Mn2+ ions instead of green and red emitting Ln3+ ions which are expensive and less abundant. The single band blue emission of Tm3+ ions was combined with the broadband greenish yellow emission of Mn2+ ions to produce strong white light emission using Ce3+ ions as excitation source. Interestingly, there is hardly any re-absorption of blue emission by Mn2+ ions and the spectrum matches the commercial Ce3+-doped YAG phosphor coated over blue LED...
November 17, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29148025/a-3-day-diary-of-dietary-protein-and-calorie-intake-by-serum-phosphate-concentration-and-binder-use-in-hemodialysis-patients
#6
Meiry J S Araújo, Luciana F Silva, Maria T S Martins, Cacia M Matos, Marcelo B Lopes, Rilma F S Santos, LarissaS Santos, Angiolina C Kraychete, Márcia T S Martins, Fernanda A Silva, Antonio A Lopes
INTRODUCTION: The use of phosphate binders to control hyperphosphatemia may allow diets less restricted in protein and calories for maintenance hemodialysis (MHD) patients. The study compared intakes of protein, calorie and phosphate among MHD patients with different serum phosphate concentrations, taking into account binder use. The hypothesis was that low serum phosphate would be associated with low intakes of protein and calories only in patients not on binders. METHODS: A cross-sectional study of 443 patients enrolled in the Prospective Study of the Prognosis of Chronic Hemodialysis Patients (PROHEMO) in Salvador, Brazil, with stratified sampling on serum phosphate: ≤3...
November 4, 2017: International Journal of Artificial Organs
https://www.readbyqxmd.com/read/29145846/comparison-of-diagnostic-methods-for-early-interproximal-caries-detection-with-near-infrared-light-transillumination-an-in-vivo-study
#7
Ismail Hakki Baltacioglu, Kaan Orhan
BACKGROUND: Although numerous studies have used digital intraoral imaging, only a few studies have used photo-optical methods for the diagnosis of caries. Moreover, several limitations exist in terms of observers (experience and specialty) and the caries lesion itself. Hence, the aims of this study were to evaluate the diagnostic capability of near-infrared light transillumination (NILT) and PSP-Bitewing radiographs and to compare the interobserver and intraobserver differences in addition to observers' experience level to detect early interproximal caries lesions in vivo...
November 16, 2017: BMC Oral Health
https://www.readbyqxmd.com/read/29144587/characterization-of-complex-heterogeneous-lipid-a-samples-using-hplc-ms-ms-technique-iii-positive-ion-mode-tandem-mass-spectrometry-to-reveal-phosphorylation-and-acylation-patterns-of-lipid-a
#8
Viktor Sándor, Anikó Kilár, Ferenc Kilár, Béla Kocsis, Ágnes Dörnyei
In this study, we report the detailed analysis of the fragmentation patterns of positively charged lipid A species based on their tandem mass spectra obtained under low-energy collision-induced dissociation conditions of an electrospray quadrupole time-of-flight mass spectrometers. The tandem mass spectrometry experiments were performed after the separation of the compounds with a reversed-phase high performance liquid chromatography method. We found that both, phosphorylated and nonphosphorylated lipid A molecules can be readily ionized in the positive-ion mode by adduct formation with triethylamine added to the eluent...
November 16, 2017: Journal of Mass Spectrometry: JMS
https://www.readbyqxmd.com/read/29143263/enhanced-stabilization-of-pb-zn-and-cd-in-contaminated-soils-using-oxalic-acid-activated-phosphate-rocks
#9
Zhuo Zhang, Guanlin Guo, Mei Wang, Jia Zhang, Zhixin Wang, Fasheng Li, Honghan Chen
Phosphate amendments, especially phosphate rock (PR), are one of the most commonly used materials to stabilize heavy metals in contaminated soils. However, most of PR reserve consists of low-grade ore, which limits the efficiency of PR for stabilizing heavy metals. This study was to enhance the stabilization of heavy metals through improving the available phosphorous (P) release of PR by oxalic acid activation. Raw PR and activated PR (APR) were characterized by scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS), X-ray powder diffraction (XRD), Brunauer-Emmett-Teller (BET) surface analysis, and laser diffraction to determine the changes of structure and composition of APR...
November 15, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29140719/effects-of-different-etching-methods-and-bonding-procedures-on-shear-bond-strength-of-orthodontic-metal-brackets-applied-to-different-cad-cam-ceramic-materials
#10
S Kutalmış Buyuk, Ahmet Serkan Kucukekenci
OBJECTIVE: To investigate the shear bond strength (SBS) of orthodontic metal brackets applied to different types of ceramic surfaces treated with different etching procedures and bonding agents. MATERIALS AND METHODS: Monolithic CAD/CAM ceramic specimens (N = 120; n = 40 each group) of feldspathic ceramic Vita Mark II, resin nanoceramic Lava Ultimate, and hybrid ceramic Vita Enamic were fabricated (14 × 12 × 3 mm). Ceramic specimens were separated into four subgroups (n = 10) according to type of surface treatment and bonding onto the ceramic surface...
November 15, 2017: Angle Orthodontist
https://www.readbyqxmd.com/read/29140683/nanocomposite-phosphor-consisting-of-cai2-eu-2-single-nanocrystals-embedded-in-crystalline-sio2
#11
Hisayoshi Daicho, Takeshi Iwasaki, Yu Shinomiya, Akitoshi Nakano, Hiroshi Sawa, Wataru Yamada, Satoru Matsuishi, Hideo Hosono
High luminescence efficiency is obtained in halide- and chalcogenide-based phosphors, but they are impractical because of their poor chemical durability. Here we report a halide-based nanocomposite phosphor with excellent luminescence efficiency and sufficient durability for practical use. Our approach was to disperse luminescent single nanocrystals of CaI2:Eu(2+) in a chemically stable, translucent crystalline SiO2 matrix. Using this approach, we successfully prepared a nanocomposite phosphor by means of self-organization through a simple solid-state reaction...
November 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29136831/rapid-method-for-determination-of-90-sr-in-seawater-by-liquid-scintillation-counting-with-an-extractive-scintillator
#12
Masaki Uesugi, Ryosuke Watanabe, Hiroaki Sakai, Akihiko Yokoyama
A rapid determination method of (90)Sr is developed for the monitoring of seawater around the Fukushima Daiichi Nuclear Power Plant (FDNPP). Three ideas of chemical separation and measurements to accelerate (90)Sr analysis are investigated. Strontium is co-precipitated in a two-step procedure with hydroxyapatite after the removal of magnesium phosphate in the presence of citric acid. The purification process of strontium is in combination with solid phase extraction disks. One or two sheets of Sr Rad disk and cyclic operations are examined to eliminate interfering substances and secure the exchange capacity...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29136585/white-emission-in-single-phase-ba2gd2si4o13-ce-3-eu-2-sm-3-phosphor-for-white-leds
#13
Xiumin Jiang, Yuqian Zhang, Jia Zhang
To develop new white-light-emitting phosphor, a series of Ce(3+)-Eu(2+)-Sm(3+) doped Ba2Gd2Si4O13 (BGS) phosphors were prepared by the solid-state reaction method, and their photoluminescence properties were studied. The Ce(3+) and Eu(2+) single-doped BGS show broad emission bands around in the region of 350-550 and 420-650nm, respectively. By co-doping Ce(3+)-Eu(2+) into BGS, the energy transfer (ET) from Ce(3+) to Eu(2+) is inefficient, which could be due to the competitive absorption between the two activator ions...
November 9, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29135464/polybenzimidazole-mxene-composite-membranes-for-intermediate-temperature-polymer-electrolyte-membrane-fuel-cells
#14
Mingming Fei, Ruizhi Lin, Yuming Deng, Hongxi Xian, Renji Bian, Xiaole Zhang, Jigui Cheng, Chenxi Xu, Dongyu Cai
This report demonstrated the first study on the use of a new 2D nanomaterial (Mxene) for enhancing membrane performance of intermediate temperature (>100 oC) polymer electrolyte membrane fuel cells (ITPEMFCs). In this study, a typical Ti3C2Tx-MXene was synthesized and incorporated into polybenzimidazole (PBI)-based membranes by using a solution blending method. The composite membrane with 3wt.% Ti3C2Tx-MXene showed the proton conductivity more than 2 times higher than that of pristine PBI membrane at the temperature range of 100-170 ºC, and led to substantial increase in maximum power density of fuel cells by ~ 30% tested at 150 oC...
November 14, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29134799/e-waste-driven-pollution-in-pakistan-the-first-evidence-of-environmental-and-human-exposure-to-flame-retardants-frs-in-karachi-city
#15
Mehreen Iqbal, Jabir Hussain Syed, Knut Breivik, Muhammad Jamshed Iqbal Chaudhry, Jun Li, Gan Zhang, Riffat Naseem Malik
Informal e-waste recycling activities have been shown to be a major emitter of organic flame retardants (FRs), contributing to both environmental and human exposure to laborers at e-waste recycling sites in some West African countries, as well as in China and India. The main objective of this study was to determine the levels of selected organic FRs in both air and soil samples collected from areas with intensive informal e-waste recycling activities in Karachi, Pakistan. Dechlorane Plus (DP) and "novel" brominated flame retardants (NBFRs) were often detected in high concentrations in soils, while phosphorous-based FRs (OPFRs) dominated atmospheric samples...
November 14, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29134292/simultaneous-determination-of-brazilin-and-protosappanin-b-in-caesalpinia-sappan-by-ionic-liquid-dispersive-liquid-phase-microextraction-method-combined-with-hplc
#16
Zhaoyang Xia, Dongdong Li, Qing Li, Yan Zhang, Wenyi Kang
The conditions of heating, ionic liquid-based ultrasonic-assisted extraction combined with reverse-phase high performance liquid chromatography were optimized to simultaneously isolate and determinate brazilin and protosappanin B in Caesalpinia sappan. Ionic liquids, including [BMIM]Br, [BMIM]BF4, [BMIM]PF6 and [HMIM]PF6, were selected as extraction solvents while methanol, acetone, acetonitrile, ethanol and water were selected as dispersants. The chromatographic column was Purospher star RP-C18 (250 mm × 4...
November 13, 2017: Chemistry Central Journal
https://www.readbyqxmd.com/read/29130300/psite-amino-acid-confidence-evaluation-for-quality-control-of-de-novo-peptide-sequencing-and-modification-site-localization
#17
Hao Yang, Hao Chi, Wen-Jing Zhou, Wen-Feng Zeng, Chao Liu, Rui-Min Wang, Zhao-Wei Wang, Xiu-Nan Niu, Zhen-Lin Chen, Si-Min He
MS-based de novo peptide sequencing has been improved remarkably with significant development of mass spectrometry and computational approaches, but still lacks quality control methods. Here we proposed a novel algorithm pSite to evaluate the confidence of each amino acid rather than the full-length peptides obtained by de novo peptide sequencing. A semi-supervised learning approach was used to discriminate correct amino acids from random ones and then an expectation-maximization algorithm was used to adaptively control the false amino-acid rate (FAR)...
November 13, 2017: Journal of Proteome Research
https://www.readbyqxmd.com/read/29128968/involvement-of-cyclodipeptides-in-the-competition-of-bacterial-communities-in-the-oligotrophic-churince-aquatic-system-of-cuatro-ci%C3%A3-negas-basin-dominated-by-gammaproteobacteria
#18
Enrique Martínez-Carranza, Gabriel Y Ponce-Soto, Alma L Díaz-Pérez, Erasmo Cadenas, Valeria Souza, Jesús Campos-García
The Cuatro Ciénegas Basin (CCB) within the Chihuahuan Desert in México is an extremely oligotrophic oasis with negligible phosphorous levels, described as a hot spot of biodiversity, not only in stromatolites and microbial mats, but also in living forms in general. The microorganisms possess the capability to produce a wide variety of virulence factors, antibiotics, and quorum-sensing (QS) crosstalk signals such as non-ribosomal cyclodipeptides (CDPs) which enables them to colonize diverse ecological niches...
November 11, 2017: Extremophiles: Life Under Extreme Conditions
https://www.readbyqxmd.com/read/29126083/hplc-uv-ms-method-application-for-the-separation-of-obeticholic-acid-and-its-related-compounds-in-development-process-and-quality-control
#19
Michal Douša, Markéta Slavíková, Tomáš Kubelka, Josef Černý, Petr Gibala, Josef Zezula
An HPLC method with UV and electrospray ionization - mass spectrometry (ESI-MS) detection was developed for the separation and determination of obeticholic acid (OBE) and its related compounds in development process and quality control. OBE and its related compounds were classified into three major group based on the mass spectra profiles: (A) those containing a hydroxyl group at position 3 and 7, (B) those containing a hydroxyl group and/or carbonyl group at position 3, hydrogen, ethyl or ethylidene group at position 6 and a hydroxyl group and/or carbonyl group at position 7, and (C) those containing carbonyl groups at position 3 and 7...
November 4, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29125054/nitrogen-and-phosphorus-release-from-organic-wastes-and-suitability-as-bio-based-fertilizers-in-a-circular-economy
#20
S D C Case, L S Jensen
The drive for a more circular economy has led to an increasing interest in recycling organic wastes as bio-based fertilizers, including those from urban settings, and food or biomedical industries. However, there is a lack of knowledge as to their fertilizer value and whether further processing could make these waste materials more valuable as bio-based fertilizers. This study screened 15 different organic waste materials including manures, digestates, sludges, composts, industry byproducts, and struvites. Nitrogen (N) and phosphorous (P) release was compared following addition to soil...
November 10, 2017: Environmental Technology
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