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https://www.readbyqxmd.com/read/29783201/n-4-18-f-fluorobenzyl-cholylglycine-a-novel-tracer-for-pet-of-enterohepatic-circulation-of-bile-acids-radiosynthesis-and-proof-of-concept-studies-in-rats
#1
Kim Frisch, Damion H R Stimson, Taracad Venkatachalam, Gregory K Pierens, Susanne Keiding, David Reutens, Rajiv Bhalla
INTRODUCTION: Enterohepatic circulation (EHC) of conjugated bile acids is an important physiological process crucial for regulation of intracellular concentrations of bile acids and their function as detergents and signal carriers. Only few bile acid-derived imaging agents have been synthesized and hitherto none have been evaluated for studies of EHC. We hypothesized that N-(4-[18 F]fluorobenzyl)cholylglycine ([18 F]FBCGly), a novel fluorine-18 labeled derivative of endogenous cholylglycine, would be a suitable tracer for PET of the EHC of conjugated bile acids, and we report here a radiosynthesis of [18 F]FBCGly and a proof-of-concept study by PET/MR in rats...
May 4, 2018: Nuclear Medicine and Biology
https://www.readbyqxmd.com/read/29783195/performance-of-a-biotrickling-filter-for-the-anaerobic-utilization-of-gas-phase-methanol-coupled-to-thiosulphate-reduction-and-resource-recovery-through-volatile-fatty-acids-production
#2
Tejaswini Eregowda, Luck Matanhike, Eldon R Rene, Piet N L Lens
The anaerobic removal of continuously fed gas-phase methanol (2.5-30 g/m3 .h) and the reduction of step-fed thiosulphate (1000 mg/L) was investigated in a biotrickling filter (BTF) operated for 123 d at an empty bed residence time (EBRT) of 4.6 and 2.3 min. The BTF performance during steady step-feed and special operational phases like intermittent liquid trickling in 6 and 24 h cycles and operation without pH regulation were evaluated. Performance of the BTF was not affected and nearly 100% removal of gas-phase methanol was achieved with an ECmax of 21 g/m3 ...
April 25, 2018: Bioresource Technology
https://www.readbyqxmd.com/read/29783190/importance-of-surface-modification-of-%C3%AE-alumina-in-creating-its-nanostructured-composites-with-zeolitic-imidazolate-framework-zif-67
#3
Yuanyuan Liu, Alexandre A S Gonçalves, Yang Zhou, Mietek Jaroniec
Application of zeolitic imidazolate framework-67 (ZIF-67) as an adsorbent has been greatly hindered by slow mass transfer of adsorbate molecules due to its inherent microporosity. To address this limitation, we have developed binary nanostructures composed of ZIF-67 and γ-alumina (GA) containing respectively micropores and large mesopores. The nanostructured composites were successfully prepared by coupling ZIF-67 and GA with and without surface modification with imidazole silane that mimics the building blocks of ZIF-67 to obtain GA-Im-ZIF-67 (with imidazole silane) and GA-ZIF-67 (without imidazole silane)...
May 7, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29783169/applying-multi-criteria-analysis-for-preliminary-assessment-of-the-properties-of-alginate-immobilized-myriophyllum-spicatum-in-lake-water-samples
#4
Jelena V Milojković, Jelena B Popović-Djordjević, Lato L Pezo, Ilija D Brčeski, Aleksandar Ž Kostić, Vladan D Milošević, Mirjana D Stojanović
The preliminary assessment of the properties of alginate immobilized aquatic weed Myriophyllum spicatum beads-MsAlg in a multi-element system of nine Serbian lakes water samples was done. Herein, the results obtained in the biosorption experiment with MsAlg contents of twenty-two elements analysed by inductively coupled plasma-optical emission spectrometry, biosorption capacity, element removal efficiency, total hardness (TH) and quality index of water (WQI) are presented. Scanning electron microscopy with energy dispersive X-ray spectroscopy was used for the characterization of M...
May 11, 2018: Water Research
https://www.readbyqxmd.com/read/29783166/in-situ-sludge-reduction-and-carbon-reuse-in-an-anoxic-oxic-process-coupled-with-hydrocyclone-breakage
#5
Yinxiang Xu, Yuanyuan Fang, Zhenhua Wang, Dan Guo, Yi Liu, Yuan Huang, Pengbo Fu, Juehui Jin, Chenwen Wei, Hualin Wang, Tao Zeng
The long-term performance of an anoxic-oxic-hydrocyclone (AOH) process with an in-situ hydrocyclone treatment unit in the mixed liquid return line for sludge reduction and carbon reuse has been observed, in comparison with a conventional anoxic-oxic (AO) process. Three parallel side-stream systems, including one AOH25 system with a 25-mm hydrocyclone, one AOH35 system with a 35-mm hydrocyclone and one AO system, were built and fed with real wastewater for a comparative study in a wastewater treatment plant...
May 9, 2018: Water Research
https://www.readbyqxmd.com/read/29783155/construction-of-hierarchically-porous-monoliths-from-covalent-organic-frameworks-cofs-and-their-application-for-bisphenol-a-removal
#6
Zhongshan Liu, Hongwei Wang, Junjie Ou, Lianfang Chen, Mingliang Ye
Subject to synthetic conditions, covalent organic frameworks (COFs) are usually in powder form. Herein, taking an azine-linked COF as an example, detailed characterizations indicated that accessible aldehyde groups and hydrazine groups (CNNH2 , 88 μmol g-1 ) concurrently existed on its surface. Intrigued by such feature, we have developed an approach based on ring-opening polymerization to shape COF powder into monoliths. The crystallinity and micropore of COF in monoliths were well remained, meanwhile, the ring-opening polymerization remarkably generated macropores ranging from 0...
May 11, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29783153/microwave-assisted-pyrolysis-of-textile-dyeing-sludge-and-migration-and-distribution-of-heavy-metals
#7
Hedong Zhang, Zuopeng Gao, Yang Liu, Chunmei Ran, Xiao Mao, Qinhao Kang, Wenya Ao, Jie Fu, Jing Li, Guangqing Liu, Jianjun Dai
This study investigated the pyrolysis characteristic of textile dyeing sludge (DS) using an auger pyrolyser under microwave irradiation at different pyrolysis temperature. The migration and distribution characteristic of heavy metals and their potential ecological risks were investigated using inductively coupled plasma mass spectrometry (ICP-MS) techniques. Temperature and additives (e.g. Ca-bentonite, kaolin and CaO) significantly affected product distribution and yields. Heavy metals showed different enrichment characteristics during pyrolysis and a great percentage of the heavy metals was retained in the sludge char (SC), depending on different temperatures and additives...
May 1, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29783083/adsorption-behaviors-of-supercritical-lennard-jones-fluid-in-slit-like-pores
#8
Yingfeng Li, Mengqi Cui, Bo Peng, Mingde Qin
Understanding the adsorption behaviors of supercritical fluid in confined space is pivotal for coupling the supercritical technology and the membrane separation technology. Based on grand canonical Monte Carlo simulations, the adsorption behaviors of a Lennard-Jones (LJ) fluid in slit-like pores at reduced temperatures over the critical temperature, Tc *  = 1.312, are investigated; and impacts of the wall-fluid interactions, the pore width, and the temperature are taken into account. It is found that even if under supercritical conditions, the LJ fluid can undergo a "vapor-liquid phase transition" in confined space, i...
May 18, 2018: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/29783042/synchronization-of-hybrid-coupled-reaction-diffusion-neural-networks-with-time-delays-via-generalized-intermittent-control-with-spacial-sampled-data
#9
Binglong Lu, Haijun Jiang, Cheng Hu, Abdujelil Abdurahman
The exponential synchronization of hybrid coupled reaction-diffusion neural networks with time delays is discussed in this article. At first, a generalized intermittent control with spacial sampled-data is introduced, which is intermittent in time and data sampling in space. This type of control strategy not only can unify the traditional periodic intermittent control and the aperiodic case, but also can lower the update rate of the controller in both temporal and spatial domains. Next, based on the designed control protocol and the Lyapunov-Krasovskii functional approach, some novel and readily verified criteria are established to guarantee the exponential synchronization of the considered networks...
May 4, 2018: Neural Networks: the Official Journal of the International Neural Network Society
https://www.readbyqxmd.com/read/29782904/intracellular-s1p-levels-dictates-fate-of-different-regions-of-the-hippocampus-following-transient-global-cerebral-ischemia
#10
Sherif Rashad, Kuniyasu Niizuma, Daisuke Saigusa, Xiaobo Han, Mika Sato-Maeda, Ritsumi Saito, Akira Uruno, Miki Fujimura, Shuntaro Ikawa, Masayuki Yamamoto, Teiji Tominaga
Sphingosine-1-phosphate (S1P) is a sphingolipid molecule produced by the action of sphingosine kinases (SphK) on sphingosine. It possesses various intracellular functions through its interactions with intracellular proteins or via its action on five G-protein-coupled cell membrane receptors. Following transient global cerebral ischaemia (tGCI), only the CA1 subregion of the hippocampus undergoes apoptosis. In this study, we evaluated S1P levels and S1P processing enzyme expression in different hippocampal areas following tGCI in rats...
May 18, 2018: Neuroscience
https://www.readbyqxmd.com/read/29782893/quantity-based-analysis-of-household-food-consumption-patterns-and-drivers-the-case-of-israel
#11
Yuval Damari, Meidad Kissinger
The interest in better understanding the characteristics and drivers of food consumption by individuals and social groups has grown in recent years, because of various social, environmental, health and economic issues. Most analyses have focused either on the macro or national scale, using food balance/disappearance data, or on the micro scale, focusing on nutrition analysis in limited groups of individual consumers. While various household characteristics are expected to influence food-purchasing habits, the scope and methodology of most previous studies limited their ability to relate to multiple factors, and integrate all into specific consumption patterns...
May 18, 2018: Appetite
https://www.readbyqxmd.com/read/29782817/evolution-of-the-developmental-plasticity-and-a-coupling-between-left-mechanosensory-neuromasts-and-an-adaptive-foraging-behavior
#12
Vânia Filipa Lima Fernandes, Christian Macaspac, Louise Lu, Masato Yoshizawa
Many animal species exhibit laterality in sensation and behavioral responses, namely, the preference for using either the left or right side of the sensory system. For example, some fish use their left eye when observing social stimuli, whereas they use their right eye to observe novel objects. However, it is largely unknown whether such laterality in sensory-behavior coupling evolves during rapid adaptation processes. Here, in the Mexican tetra, Astyanax mexicanus, we investigate the laterality in the relationship between an evolved adaptive behavior, vibration attraction behavior (VAB), and its main sensors, mechanosensory neuromasts...
May 18, 2018: Developmental Biology
https://www.readbyqxmd.com/read/29782704/profiling-of-new-psychoactive-substances-nps-by-using-stable-isotope-ratio-mass-spectrometry-irms-study-on-the-synthetic-cannabinoid-5f-pb-22
#13
S Münster-Müller, N Scheid, T Holdermann, S Schneiders, M Pütz
In this paper results of a pilot study on the profiling of the synthetic cannabinoid receptor agonist 5F-PB-22 (5F-QUPIC, pentylfluoro-1H-indole-3-carboxylic acid-8-quinolinyl ester) via isotope ratio mass spectrometry are presented. It is focused on δ13 C, δ15 N and δ2 H isotope ratios, which are determined using elemental analyser (EA) and high temperature elemental analyser (TC/EA) coupled to an isotope ratio mass spectrometer (IRMS). By means of a sample of pure material of 5F-PB-22 it is shown that the extraction of 5F-PB-22 from herbal material, a rapid clean-up procedure, or preparative column chromatography had no influences on the isotope ratios...
May 21, 2018: Drug Testing and Analysis
https://www.readbyqxmd.com/read/29782686/promotion-and-inhibition-of-synchronous-glycolytic-oscillations-in-yeast-by-chitosan
#14
Kenichi Shibata, Takashi Amemiya, Yu Kawakita, Kohei Obase, Kiminori Itoh, Masahiro Takinoue, Satoshi Nakata, Tomohiko Yamaguchi
Synchronous rhythmic activities play crucial roles in diverse biological systems. Glycolytic oscillations in yeast cells have been studied for 50 years with the aim of elucidating the mechanisms underlying the intracellular oscillations and their synchronization. We investigated the effects of chemical disturbances on the individual and collective glycolytic oscillations in yeast cells encapsulated in alginate microparticles, and demonstrated that the addition of chitosan, an antimicrobial agent, decreased the duration of these oscillations...
May 21, 2018: FEBS Journal
https://www.readbyqxmd.com/read/29782683/nife-oxy-hydroxides-derived-from-nife-disulfides-as-an-efficient-oxygen-evolution-catalyst-for-rechargeable-zn-air-batteries-the-effect-of-surface-s-residues
#15
Tanyuan Wang, Gyutae Nam, Yue Jin, Xingyu Wang, Pengju Ren, Min Gyu Kim, Jiashun Liang, Xiaodong Wen, Haeseong Jang, Jiantao Han, Yunhui Huang, Qing Li, Jaephil Cho
A facile H2 O2 oxidation treatment to tune the properties of metal disulfides for oxygen evolution reaction (OER) activity enhancement is introduced. With this method, the degree of oxidation can be readily controlled and the effect of surface S residues in the resulted metal (oxy)hydroxides for the OER is revealed for the first time. The developed NiFe (oxy)hydroxide catalyst with residual S demonstrates an extraordinarily low OER overpotential of 190 mV at the current density of 10 mA cm-2 after coupling with carbon nanotubes, and outstanding performance in Zn-air battery tests...
May 21, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29782682/a-centimeter-scale-inorganic-nanoparticle-superlattice-monolayer-with-non-close-packing-and-its-high-performance-in-memory-devices
#16
Ke Wang, Haifeng Ling, Yan Bao, Mengting Yang, Yi Yang, Mubashir Hussain, Huayang Wang, Lianbin Zhang, Linghai Xie, Mingdong Yi, Wei Huang, Xiaolin Xie, Jintao Zhu
Due to the near-field coupling effect, non-close-packed nanoparticle (NP) assemblies with tunable interparticle distance (d) attract great attention and show huge potential applications in various functional devices, e.g., organic nano-floating-gate memory (NFGM) devices. Unfortunately, the fabrication of device-scale non-close-packed 2D NPs material still remains a challenge, limiting its practical applications. Here, a facile yet robust "rapid liquid-liquid interface assembly" strategy is reported to generate a non-close-packed AuNP superlattice monolayer (SM) on a centimeter scale for high-performance pentacene-based NFGM...
May 21, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29782678/nanoparticle-enhanced-silver-nanowire-plasmonic-electrodes-for-high-performance-organic-optoelectronic-devices
#17
Taehyo Kim, Saewon Kang, Jungwoo Heo, Seungse Cho, Jae Won Kim, Ayoung Choe, Bright Walker, Ravi Shanker, Hyunhyub Ko, Jin Young Kim
Improved performance in plasmonic organic solar cells (OSCs) and organic light-emitting diodes (OLEDs) via strong plasmon-coupling effects generated by aligned silver nanowire (AgNW) transparent electrodes decorated with core-shell silver-silica nanoparticles (Ag@SiO2 NPs) is demonstrated. NP-enhanced plasmonic AgNW (Ag@SiO2 NP-AgNW) electrodes enable substantially enhanced radiative emission and light absorption efficiency due to strong hybridized plasmon coupling between localized surface plasmons (LSPs) and propagating surface plasmon polaritons (SPPs) modes, which leads to improved device performance in organic optoelectronic devices (OODs)...
May 21, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29782667/synergies-of-electrochemical-metallization-and-valance-change-in-all-inorganic-perovskite-quantum-dots-for-resistive-switching
#18
Yan Wang, Ziyu Lv, Qiufan Liao, Haiquan Shan, Jinrui Chen, Ye Zhou, Li Zhou, Xiaoli Chen, Vellaisamy A L Roy, Zhanpeng Wang, Zongxiang Xu, Yu-Jia Zeng, Su-Ting Han
The in-depth understanding of ions' generation and movement inside all-inorganic perovskite quantum dots (CsPbBr3 QDs), which may lead to a paradigm to break through the conventional von Neumann bottleneck, is strictly limited. Here, it is shown that formation and annihilation of metal conductive filaments and Br- ion vacancy filaments driven by an external electric field and light irradiation can lead to pronounced resistive-switching effects. Verified by field-emission scanning electron microscopy as well as energy-dispersive X-ray spectroscopy analysis, the resistive switching behavior of CsPbBr3 QD-based photonic resistive random-access memory (RRAM) is initiated by the electrochemical metallization and valance change...
May 21, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29782651/pharmacokinetic-and-metabolism-studies-of-bavachinin-through-ultra-high-performance-liquid-chromatography-coupled-with-electrospray-ionization-tandem-mass-spectrometry
#19
Jun Qian, Fan Xie, Yanhong Shi, Jinhang Li, Liuqiang Zhang, Yiming Li, Fujiang Guo, Rui Wang
Bavachinin (BVC), one of the main bioactive prenylated flavonoids derived from Psoralea corylifolia Linn, has a wide variety of pharmacological effects, such as antiangiogenic, antitumour, antiallergic, anti-inflammatory, and antibacterial activities, especially as a pan-peroxisome proliferator-activated receptors (PPARs) agonist. A rapid and sensitive method for quantifying BVC in rat plasma was developed and validated through ultra-high-performance liquid chromatography coupled with electrospray-ionization tandem mass spectrometry...
May 21, 2018: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/29782582/surfaces-from-the-visual-past-recovering-high-resolution-terrain-data-from-historic-aerial-imagery-for-multitemporal-landscape-analysis
#20
Christopher Sevara, Geert Verhoeven, Michael Doneus, Erich Draganits
Historic aerial images are invaluable sources of aid to archaeological research. Often collected with large-format photogrammetric quality cameras, these images are potential archives of multidimensional data that can be used to recover information about historic landscapes that have been lost to modern development. However, a lack of camera information for many historic images coupled with physical degradation of their media has often made it difficult to compute geometrically rigorous 3D content from such imagery...
2018: Journal of archaeological method and theory
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