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Han Sol Doh, Hyun Jin Park
Abalone is one of the most valuable marine products found in East Asia because it is rich in nutritious substances including iodine. In this study, the in vitro dialyzability approach was used to assess the bio-available iodine species in abalone. Iodide, iodate, 3-iodo-L-tyrosine (MIT), and 3,5-diiodo-L-tyrosine (DIT) were separated by high-performance liquid chromatography hyphenated with inductively coupled plasma-mass spectrometry (HPLC-ICP-MS). To assure the consistency, reliability, and accuracy of the data, the method was validated...
May 22, 2018: Journal of Food Science
K W Ranatunga
Observations made in temperature studies on mammalian muscle during force development, shortening, and lengthening, are re-examined. The isometric force in active muscle goes up substantially on warming from less than 10 °C to temperatures closer to physiological (>30 °C), and the sigmoidal temperature dependence of this force has a half-maximum at ~10 °C. During steady shortening, when force is decreased to a steady level, the sigmoidal curve is more pronounced and shifted to higher temperatures, whereas, in lengthening muscle, the curve is shifted to lower temperatures, and there is a less marked increase with temperature...
May 22, 2018: International Journal of Molecular Sciences
Christoph Rameshan, Hao Li, Kresimir Anic, Matteo Roiaz, Verena Pramhaas, Raffael Rameshan, Raoul Blume, Michael Hävecker, Jan Knudsen, Axel Knop-Gericke, Gunther Rupprechter
Due to the need of sustainable energy sources, methane dry reforming (MDR) is a useful reaction for the conversion of the greenhouse gases CH<sub>4</sub> and CO<sub>2</sub> to synthesis gas (CO + H<sub>2</sub>). Syngas is the basis for a wide range of commodity chemicals and can be utilized for fuel production via Fischer-Tropsch (FT) synthesis. The current study focuses on spectroscopic investigations of the surface and reaction properties of a ZrO<sub>2</sub>/Pt inverse model catalyst, i...
May 22, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
James V Hennessey
Pharmacokinetic assessment of the impact of milk on LT4 ingestion.
May 22, 2018: Thyroid: Official Journal of the American Thyroid Association
Ioannis Papadakis, Zoi Bouza, Aristeidis Stathis, Ioannis Orfanos, Stelios Couris, Tanja Miletić, Davide Bonifazi
The nonlinear optical response of some O-doped PAHs is systematically investigated in the present work aiming to understand the influence of structural effects on their nonlinear optical response. In that view, the third-order nonlinear optical properties of these PAHs were measured under 4 ns, visible (532 nm) and infrared (1064 nm) laser excitation. The O-doped PAHs were found exhibiting large saturable absorption and negative sign nonlinear refraction under visible excitation, both increasing with the addition of naphtalene units and with the number of O-atoms...
May 22, 2018: Journal of Physical Chemistry. A
Gulsiye Ozturk Urut, Seher Aydin, Derya Topkaya, Elif Sahin, Serap Alp
New fluorescent thiophenyl group containing oxazol-5-one fluorophores of 3a (4-(3-thiophenylmethylene)-2-phenyloxazol-5-one), 3b (4-(3-thiophenylmethylene)-2-(4-tolyl)oxazol-5-one) and 3c (4-(3-thiophenylmethylene)-2-(4-nitrophenyl)oxazol-5-one) were synthesized and characterized. The newly synthesized oxazol-5-ones absorption and fluorescence characteristics were studied in some solvents of varying polarities. The heterocyclic chromophores were fluorescent, with two of them, 3a and 3b, emitting blue light, whilst the other one, 3c, emitting green light...
May 21, 2018: Journal of Fluorescence
Siyu Cao, Yue Zhao, Sajid Ur Rehman, Shuai Feng, Yuhua Zuo, Chuanbo Li, Lichun Zhang, Buwen Cheng, Qiming Wang
In this paper, we provide a detailed insight on InGaAs/InAlAs separate absorption, grading, charge, and multiplication avalanche photodiodes (SAGCM APDs) and a theoretical model of APDs is built. Through theoretical analysis and two-dimensional (2D) simulation, the influence of charge layer and tunneling effect on the APDs is fully understood. The design of charge layer (including doping level and thickness) can be calculated by our predictive model for different multiplication thickness. We find that as the thickness of charge layer increases, the suitable doping level range in charge layer decreases...
May 21, 2018: Nanoscale Research Letters
Ayuko Imaoka, Kosuke Abiru, Takeshi Akiyoshi, Hisakazu Ohtani
Background: Intestinal absorption of new quinolones is decreased by oral administration of polyvalent metal cations. Some clinical studies have demonstrated this drug - drug interaction is more prominent under fasted condition. However, the effect of food intake on the extent of drug - drug interaction between new quinolones and metal cations remains to be investigated quantitatively and systematically. The aim of this study was to develop an animal model that enables to evaluate the effect of food intake on the extent of drug - drug interaction in the gastrointestinal tract by chelation and to apply the model to evaluate quantitatively the effect of food intake on the drug - drug interaction between two new quinolones, ofloxacin or ciprofloxacin and sucralfate...
2018: Journal of Pharmaceutical Health Care and Sciences
Romain Carron, Enrico Avancini, Thomas Feurer, Benjamin Bissig, Paolo A Losio, Renato Figi, Claudia Schreiner, Melanie Bürki, Emilie Bourgeois, Zdenek Remes, Milos Nesladek, Stephan Buecheler, Ayodhya N Tiwari
Cu(In,Ga)Se2 based solar cells have reached efficiencies close to 23%. Further knowledge-driven improvements require accurate determination of the material properties. Here, we present refractive indices for all layers in Cu(In,Ga)Se2 solar cells with high efficiency. The optical bandgap of Cu(In,Ga)Se2 does not depend on the Cu content in the explored composition range, while the absorption coefficient value is primarily determined by the Cu content. An expression for the absorption spectrum is proposed, with Ga and Cu compositions as parameters...
2018: Science and Technology of Advanced Materials
Ming Zhang, Wentao Wang, Yingjun Cui, Ninglin Zhou, Jian Shen
Background: Recently, combined photodynamic therapy (PDT) and photothermal therapy (PTT) has become a desired treatment for cancer. However, the development of economic, high-efficiency, and safe photosensitizers/photothermal agents remains a significant challenge. Methods: A novel nanocomposite has been developed via the assembly of iron oxide carbon dot (Fe3 O4 -CDs) nanoparticles and black phosphorus quantum dots (genipin [GP]-polyglutamic acid [PGA]-Fe3 O4 -CDs@BPQDs), and this nanocomposite shows a broad light-absorption band and a photodegradable character...
2018: International Journal of Nanomedicine
Yongqiang Tan, Heng Luo, Xiaosong Zhou, Shuming Peng, Haibin Zhang
The microstructure dependent electromagnetic interference (EMI) shielding properties of nano-layered Ti3 AlC2 ceramics were presented in this study by comparing the shielding properties of various Ti3 AlC2 ceramics with distinct microstructures. Results indicate that Ti3 AlC2 ceramics with dense microstructure and coarse grains are more favourable for superior EMI shielding efficiency. High EMI shielding effectiveness over 40 dB at the whole Ku-band frequency range was achieved in Ti3 AlC2 ceramics by microstructure optimization, and the high shielding effectiveness were well maintained up to 600 °C...
May 21, 2018: Scientific Reports
Zamyla Morgan Chan, Daniil A Kitchaev, Johanna Nelson Weker, Christoph Schnedermann, Kipil Lim, Gerbrand Ceder, William Tumas, Michael F Toney, Daniel G Nocera
Electrodeposited manganese oxide films are promising catalysts for promoting the oxygen evolution reaction (OER), especially in acidic solutions. The activity of these catalysts is known to be enhanced by the introduction of Mn3+ We present in situ electrochemical and X-ray absorption spectroscopic studies, which reveal that Mn3+ may be introduced into MnO2 by an electrochemically induced comproportionation reaction with Mn2+ and that Mn3+ persists in OER active films. Extended X-ray absorption fine structure (EXAFS) spectra of the Mn3+ -activated films indicate a decrease in the Mn-O coordination number, and Raman microspectroscopy reveals the presence of distorted Mn-O environments...
May 21, 2018: Proceedings of the National Academy of Sciences of the United States of America
Huili Ye, Hao Wang, Bihong Zhang, Faqiong Zhao, Baizhao Zeng
Tremella-like ZnIn2 S4 (ZISt) and flower-like microsphere ZnIn2 S4 (ZISm) were synthesized via a straightforward hydrothermal method. It was found that the ZISt was superior to ZISm for photoelectrochemical (PEC) sensing because of its large surface area and high photocatalytic activity. A composite of ZISt and graphene (GR) was prepared and used for the PEC sensing of dopamine (DA). Here DA acted as an electron donor to scavenge the hole and inhibit the charge recombination. The GR enhanced visible light absorption and accelerated electron transfer, amplifying the photocurrent signal...
August 15, 2018: Talanta
Sima Bargrizan, Ronald J Smernik, Rob W Fitzpatrick, Luke M Mosley
pH is a "master variable" controlling many biogeochemical processes in soils. Acid sulfate soils undergo rapid and large pH changes from circumneutral pH under anaerobic soil conditions to sulfuric soils with ultra (pH < 3.5) and extremely (pH 3.5-4.4) acidic properties following oxidation. Measuring soil pH using a glass electrode has several potential drawbacks including liquid junction errors, drift, suspension effects and clogging. Spectrophotometric pH measurement, involving addition of an indicator dye to the sample, is widely used in seawater and has recently been developed for soil extracts at circumneutral pH ranges...
August 15, 2018: Talanta
Xiuxuan Zhang, Yan Zhou, Xiaofei Gu, Yu Cheng, Manxin Hong, Liqiang Yan, Fulong Ma, Zhengjian Qi
Cytochrome P450s have brought considerable attention to researchers for their significant correlations with metabolic behaviors of procarcinogenic chemicals. To better understand the roles of CYP1A in biological and physiological systems, we developed a novel ratiometric fluorescence probe N-((2-hydroxyl ethoxy) ethyl)- 4-methoxy-1, 8-naphthalimide (NEMN) allowing for selectively and sensitively monitoring the target enzymes under physiological conditions and living cells. The probe was designed based on substrate predilection of CYP1A and its outstanding O-dealkylation capacity, and 1, 8-naphthalimide was chosen as fluorophore on account of its desirable photophysical properties...
August 15, 2018: Talanta
Yuanling Sun, Chaofan Ding, Yanna Lin, Weiyan Sun, Hao Liu, Xiaodong Zhu, Yuxue Dai, Chuannan Luo
In this work, a highly selective and sensitive chemiluminescence (CL) biosensor was prepared for adenosine (AD) detection based on carbon quantum dots (CQDs) catalyzing the CL system of luminol-H2 O2 under alkaline environment and CQDs was released from the surface of AD aptamers functionalized graphene @ magnetic β-cyclodextrin polymers (GO@Fe3 O4 @β-CD@A-Apt). Firstly, GO@Fe3 O4 @β-CD and CQDs were prepared and characterized by transmission electron microscopy (TEM), scanning electron microscope (SEM), UV-Vis absorption spectra (UV), fluorescence spectra (FL), fourier transform infrared (FTIR) and X-ray powder diffraction (XRD)...
August 15, 2018: Talanta
Reza Akramipour, Mohammad Reza Golpayegani, Simin Gheini, Nazir Fattahi
In this research, a new vortex assisted dispersive liquid-liquid microextraction based on the freezing of deep eutectic solvent (VADLLME-FDES) has been developed for the determination of organic mercury (R-Hg) and inorganic mercury (Hg2+ ) in blood samples prior to their analysis by graphite furnace atomic absorption spectrometry (GFAAS). In this method, a green solvent consisting of 1-octyl-3-methylimidazolium chloride and 1-undecanol was used as an extraction solvent, yielding the advantages of material stability, low density, and a suitable freezing point near room temperature...
August 15, 2018: Talanta
Francylaine Silva de Almeida, Cinthia Aparecida de Andrade Silva, Sandro Marcio Lima, Yzel Rondon Suarez, Luis Humberto da Cunha Andrade
Mashing is an enzymatic procedure for the extraction of sugars from malt. It has strong temperature dependence, so monitoring the sugar production is very important for optimization of the brewing process. In this work, Fourier transform infrared spectroscopy (FTIR) was used to monitor three different mashing programs. These all presented high concentrations of maltose and dextrin, enabling their differentiation according to the FTIR absorption bands at 991 and 1022 cm-1 , characteristic of maltose and dextrin, respectively...
October 15, 2018: Food Chemistry
Fabio Carfagna, Lucia Del Vecchio, Giuseppe Pontoriero, Francesco Locatelli
Hyperphosphatemia is common in late stages of chronic kidney disease and is often associated with elevated parathormone levels, abnormal bone mineralization, extra-osseous calcification, and increased risk of cardiovascular events and death. Several classes of oral phosphate binders are available to help control plasma phosphorus levels. Although effective at lowering serum phosphorus, they all have safety, tolerability, and compliance issues that need to be considered when selecting which one to use. Areas covered: This paper reviews the most established treatment options for hyperphosphatemia, in patients with chronic kidney disease, focusing on the new inhibitors of active phosphate absorption...
May 21, 2018: Expert Opinion on Drug Safety
Sergio Dominguez, Michela Cangiotti, Alberto Fattori, Timo Aaritalo, Pia Damlin, Maria Francesca Ottaviani, Carita Kvarnstrom
Aggregation of cationic isothiouronium polythiophenes with alkoxy-spacers of different lengths at the 3-position of the thiophene ring was studied in solvents of different polarity. Hydrogen bonding capacity was assessed by steady-state absorption and fluorescence spectroscopy, while the aggregation in aqueous solutions was studied by electron paramagnetic resonance spectroscopy, using paramagnetic probes of different polarities. The two polymers displayed similar features in respect to conformation, effect of co-solvents on aggregation, unstructured absorption/fluorescence spectra, Stokes shifts when aggregated, solvatochromic effect and self-quenching concentration...
May 22, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
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