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https://www.readbyqxmd.com/read/28822101/revisiting-the-logan-plot-to-account-for-non-negligible-blood-volume-in-brain-tissue
#1
Martin Schain, Patrik Fazio, Ladislav Mrzljak, Nahid Amini, Nabil Al-Tawil, Cheryl Fitzer-Attas, Juliana Bronzova, Bernhard Landwehrmeyer, Christina Sampaio, Christer Halldin, Andrea Varrone
BACKGROUND: Reference tissue-based quantification of brain PET data does not typically include correction for signal originating from blood vessels, which is known to result in biased outcome measures. The bias extent depends on the amount of radioactivity in the blood vessels. In this study, we seek to revisit the well-established Logan plot and derive alternative formulations that provide estimation of distribution volume ratios (DVRs) that are corrected for the signal originating from the vasculature...
August 18, 2017: EJNMMI Research
https://www.readbyqxmd.com/read/28822048/evaluation-of-methods-to-determine-adsorption-of-polycyclic-aromatic-hydrocarbons-to-dispersed-carbon-nanotubes
#2
Berit Glomstad, Lisbet Sørensen, Jingfu Liu, Mohai Shen, Florian Zindler, Bjørn M Jenssen, Andy M Booth
A number of methods have been reported for determining hydrophobic organic compound adsorption to dispersed carbon nanotubes (CNTs), but their accuracy and reliability remain uncertain. We have evaluated three methods to investigate the adsorption of phenanthrene (a model polycyclic aromatic hydrocarbon, PAH) to CNTs with different physicochemical properties: dialysis tube (DT) protected negligible depletion solid phase microextraction (DT-nd-SPME), ultracentrifugation, and filtration using various types of filters...
August 19, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28821935/age-related-t2-relaxation-times-at-3-tesla-as-a-biomarker-of-infratentorial-brain-maturation
#3
Eva Bültmann, Loukia M Spineli, Friederike Göhner, Hans Hartmann, Heinrich Lanfermann
PURPOSE: The purpose of this study was to examine age-related, infratentorial changes in T2 relaxation times during infancy and childhood using routine MRI data at 3 Tesla. METHODS: One hundred patients (0-199 months) without signal abnormalities on conventional MRI were retrospectively selected from our pool of pediatric MRI examinations. T2 maps based on our routinely acquired triple-echo turbo spin-echo (TSE) sequence were created. Based on their clinical symptoms, the children were divided into 43 controls and 57 diseased children with different clinical diseases...
August 18, 2017: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/28821560/optoacoustic-detection-of-early-therapy-induced-tumor-cell-death-using-a-targeted-imaging-agent
#4
Bangwen Xie, Michal R Tomaszewski, Andre Neves, Susana Ros, De-En Hu, Sarah McGuire, Stefanie Roshy Mullins, David A Tice, Richard C A Sainson, Sarah E Bohndiek, Robert W Wilkinson, Kevin M Brindle
The development of new treatments and their deployment in the clinic may be assisted by imaging methods that allow an early assessment of treatment response in individual patients. The C2A domain of Synaptotagmin-I (C2Am), which binds to the phosphatidylserine (PS) exposed by apoptotic and necrotic cells, has been developed as an imaging probe for detecting cell death. Multispectral optoacoustic tomography (MSOT) is a real-time and clinically applicable imaging modality that was used here with a near infrared (NIR) fluorophore-labeled C2Am to image tumor cell death in mice treated with a TNF-related apoptosis-inducing ligand receptor 2 (TRAILR2) agonist and with 5-fluorouracil (5-FU)...
August 18, 2017: Clinical Cancer Research: An Official Journal of the American Association for Cancer Research
https://www.readbyqxmd.com/read/28821154/design-and-characterization-of-a-biocompatible-physical-hydrogel-based-on-scleroglucan-for-topical-drug-delivery
#5
Patrizia Paolicelli, Gabriele Varani, Settimio Pacelli, Elisa Ogliani, Martina Nardoni, Stefania Petralito, Alessandra Adrover, Maria Antonietta Casadei
Physical hydrogels of a high-carboxymethylated derivative of scleroglucan (Scl-CM300) were investigated as potential systems for topical drug delivery using three different therapeutic molecules (fluconazole, diclofenac and betamethasone). Rheological tests were carried out on drug-loaded hydrogels along with in-vitro release studies in a vertical Franz cell, in order to investigate if and how different drugs may influence the rheological and release properties of Scl-CM300 hydrogels. Experimental results and theoretical modeling highlighted that, in the absence of drug/polymer interactions (as for fluconazole and betamethasone) Scl-CM300 matrices offer negligible resistance to drug diffusion and a Fickian transport model can be adopted to estimate the effective diffusion coefficient in the swollen hydrogel...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821100/activation-of-tempo-by-clo2-for-oxidation-of-cellulose-by-hypochlorite-fundamental-and-practical-aspects-of-the-catalytic-system
#6
Timo Pääkkönen, Raili Pönni, Jinze Dou, Markus Nuopponen, Tapani Vuorinen
Bromide-free TEMPO-catalyzed oxidation of the primary alcohols by sodium hypochlorite (NaOCl) does not proceed without a prior activation of the catalyst. Here were demonstrate an immediate in situ activation of the catalyst with an equimolar addition of chlorine dioxide (ClO2) relative to TEMPO. Sodium bromide (NaBr) had a similar role in activating the catalyst although NaBr was needed in excess and the activation took several minutes depending on the dosage of NaBr. The activation method, or the concentration of NaBr, did not affect the bulk oxidation rate...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821019/stimulus-characteristics-of-single-word-tests-of-children-s-speech-sound-production
#7
Toby Macrae
Purpose: This clinical focus article provides readers with a description of the stimulus characteristics of 12 popular tests of speech sound production. Method: Using significance testing and descriptive analyses, stimulus items were compared in terms of the number of opportunities for production of all consonant singletons, clusters, and rhotic and nonrhotic vowels of Standard American English; phonetic/phonological and structural complexity; and the presence of bound morphemes...
August 18, 2017: Language, Speech, and Hearing Services in Schools
https://www.readbyqxmd.com/read/28820995/influence-of-monitoring-data-selection-for-optimization-of-a-steady-state-multimedia-model-on-the-magnitude-and-nature-of-the-model-prediction-bias
#8
Hee Seok Kim, Dong Soo Lee
SimpleBox is an important multimedia model used to estimate the predicted environmental concentration for screening-level exposure assessment. The main objectives were (i) to quantitatively assess how the magnitude and nature of prediction bias of SimpleBox vary with the selection of observed concentration data set for optimization and (ii) to present the prediction performance of the optimized SimpleBox. The optimization was conducted using a total of 9604 observed multimedia data for 42 chemicals of four groups (i...
August 12, 2017: Chemosphere
https://www.readbyqxmd.com/read/28820526/silica-nanoparticle-monolayers-on-a-macroion-modified-surface-formation-mechanism-and-stability
#9
M Morga, Z Adamczyk, D Kosior
Even though silica nanoparticles and their monolayers find a broad field of applications, only a few studies providing a quantitative description of silica nanoparticle deposition at solid/liquid interfaces have been reported in the literature. Given the deficit of reliable experimental data, the goal of this work is to acquire thorough physicochemical characteristics of amorphous silica nanoparticle deposition. Silica nanoparticle monolayers of controlled coverage were formed on macroion (PAH)-modified mica...
August 18, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28820329/sources-to-variability-in-circulating-human-mirna-signatures
#10
Andreas Keller, Trine Rounge, Christina Backes, Nicole Ludwig, Randi Gislefoss, Petra Leidinger, Hilde Langseth, Eckart Meese
An increasing number of studies propose circulating microRNAs (miRNAs) as biomarkers for a large number of human diseases including cancer, cardiovascular diseases, neurological pathologies and others. To further validate miRNA as biomarkers it is indispensable to understand the variability of circulating miRNAs in healthy individuals. We determined the longitudinal miRNomes of 90 serum samples from the Janus Serum Bank in Norway, which have been stored between 23 and 40 years at -25 degrees Celsius. We profiled three serum samples with microarrays for 30 individuals, each...
August 18, 2017: RNA Biology
https://www.readbyqxmd.com/read/28820255/discovery-of-a-potent-inhibitor-class-with-high-selectivity-towards-clostridial-collagenases
#11
Esther Schönauer, Andreas Martin Kany, Jörg Haupenthal, Kristina Hüsecken, Isabel Josephin Hoppe, Katrin Voos, Samir Yahiaoui, Brigitta Elsässer, Christian Ducho, Hans Brandstetter, Rolf W Hartmann
Secreted virulence factors like bacterial collagenases are conceptually attractive targets for fighting microbial infections. However, previous attempts to develop potent compounds against these metalloproteases failed to achieve selectivity against human metalloproteases such as MMPs. Using an SPR-based screening complemented with enzyme inhibition assays, we discovered an N-aryl mercaptoacetamide-based inhibitor scaffold that showed submicromolar affinities towards collagenase H (ColH) from the human pathogen Clostridium histolyticum...
August 18, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28820219/mo-doped-ni2p-nanowire-arrays-an-efficient-electrocatalyst-for-the-hydrogen-evolution-reaction-with-enhanced-activity-at-all-ph-values
#12
Yiqiang Sun, Lifeng Hang, Qi Shen, Tao Zhang, Huilin Li, Xiaomin Zhang, Xianjun Lyu, Yue Li
We report the successful synthesis of Mo doped Ni2P nanowires (NWs) on a Ni foam (NF) substrate by a two-step strategy, which could be used as an efficient and stable hydrogen evolution reaction (HER) electrocatalyst over the whole pH range (0-14). Electrochemical investigations demonstrated that Mo doping made the catalytic activity of Ni2P significantly enhanced. To achieve a current density of 10 mA cm(-2), Mo-Ni2P NWs/NF required an overpotential of 67 mV in acidic solution, 78 mV in alkaline solution and 84 mV in neutral solution...
August 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28820199/tuning-the-copper-ii-coordination-properties-of-cyclam-by-subtle-chemical-modifications
#13
Nathalie Camus, Nathalie Le Bris, Selbi Nuryyeva, Matthieu Chessé, David Esteban-Gómez, Carlos Platas-Iglesias, Raphaël Tripier, Mourad Elhabiri
The acid-base and copper(ii) coordination properties of three previously described cyclam derivatives are reported. Potentiometry, mass spectrometry, UV-vis absorption spectroscopy, electrochemistry and theoretical calculations were combined to investigate the protonation and binding properties of Bn-cyclam-EtOH (L1), oxo-cyclam-EtOH (L2) and oxo-Bn-cyclam-EtOH (L3). These three cyclams are C-functionalized by a hydroxyethyl pendant arm and display either one N-benzyl group and/or an amide replacing one macrocyclic secondary amine...
August 18, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28820081/effects-of-1-5-anhydroglucitol-on-postprandial-blood-glucose-and-insulin-levels-and-hydrogen-excretion-in-rats-and-healthy-humans
#14
Sadako Nakamura, Kenichi Tanabe, Kazuhiro Yoshinaga, Fumio Shimura, Tsuneyuki Oku
The inhibition by 1,5-anhydro-d-glucitol (1,5-AG) was determined on disaccharidases of rats and humans. Then, the metabolism and fate of 1,5-AG was investigated in rats and humans. Although 1,5-AG inhibited about 50 % of sucrase activity in rat small intestine, the inhibition was less than half of d-sorbose. 1,5-AG strongly inhibited trehalase and lactase, whereas d-sorbose inhibited them very weakly. 1,5-AG noncompetitively inhibited sucrase. The inhibition of 1,5-AG on sucrase and maltase was similar between humans and rats...
July 2017: British Journal of Nutrition
https://www.readbyqxmd.com/read/28820045/effect-of-air-flow-rate-and-c-n-ratio-on-biological-nitrogen-removal-through-canon-process-treating-reject-water
#15
Seyyed Alireza Mousavi, Mohammad Mehralian, Maryam Khashij, Shaliza Ibrahim
CANON process is a promising way for nitrogen removal in wastewaters with low organic carbon content like reject water. This study investigated the effect of important factor for optimization of CANON process through inhibition of nitrite-oxidizing bacteria (NOB). In acclimation period, complete ammonium removal and 43.3% total N removal were obtained at HRT of 12 h, temperature of 30 ± 0.5 °C and DO equal to. The effect of air flow rate (representative of DO), SRT and C/N were evaluated. Air flow rate (AFR) was most important factor for controlling the process, but the effect of SRT was negligible...
August 18, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28820012/effect-of-rotational-prosthetic-alignment-variation-on-tibiofemoral-contact-pressure-distribution-and-joint-kinematics-in-total-knee-replacement
#16
Xin Xie, Roy Rusly, John D DesJardins, Frank Voss, Kim Chillag, Martine LaBerge
In total knee replacement surgery, implant alignment is one of the most important criteria for successful long-term clinical outcome. During total knee replacement implantation, femoral and tibial alignment are determined through appropriate bone resections, which could vary based on patient anatomy, implant design and surgical technique and further influence loading conditions and clinical outcomes. The current research focused on three critical alignment parameters for total knee replacement insertion: femoral component internal/external (I/E) rotation, varus-valgus tibiofemoral angulation and posterior tibial slope...
August 1, 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/28819880/theoretical-analysis-of-c-f-bond-cleavage-mediated-by-cob-i-alamin-based-structures
#17
D Cortés-Arriagada, A Toro-Labbe, J R Mora, L Rincón, R Mereau, F J Torres
In the present work, C-F bond cleavage mediated by the super-reduced form of cobalamin (i.e., Co(I)Cbl) was theoretically studied at the ONIOM(BP86/6-311++G(d,p):PM6) + SMD level of theory. Dispersion effects were introduced by employing Grimme's empirical dispersion at the ONIOM(BP86-D/6-311++G(d,p):PM6) + SMD level. In the first stage of the study, cobalamin was characterized in terms of the coordination number of the central cobalt atom. The ONIOM(BP86/6-311++G(d,p):PM6) results showed that the base-off form of the system is slightly more stable than its base-on counterpart (ΔE = E base-off - E base-on ~ -2 kcal/mol)...
August 17, 2017: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/28819831/biodiversity-variability-and-metal-accumulation-strategies-in-plants-spontaneously-inhibiting-fly-ash-lagoon-india
#18
Suchita Mukhopadhyay, Vivek Rana, Adarsh Kumar, Subodh Kumar Maiti
Out of 29 plant species taken into consideration for biodiversity investigations, the present study screened out Cyperus rotundus L., Calotropis procera (Aiton) W.T. Aiton, Croton bonplandianus Baill., Eclipta prostrata (L.) L., and Vernonia cinerea (L.) Less. as the most suitable metal-tolerant plant species (high relative density and frequency) which can grow on metal-laden fly ash (FA) lagoon. Total (aqua-regia), residual (HNO3) and plant available (CaCl2) metal concentrations were assessed for the clean-up of metal-contaminated FA disposal site using naturally colonized plants...
August 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28819670/mimicking-wettability-alterations-using-temperature-gradients-for-water-nanodroplets
#19
Chirodeep Bakli, Sree Hari P D, Suman Chakraborty
A sessile droplet or a film usually moves from hotter regions to colder regions, due to variations in interfacial tension. This, known as the so-called Marangoni effect, is true for most pure liquids like water for which the surface tension decreases with an increase in temperature. In stark contrast to this existing understanding, we bring forth the coupled effect of wettability and temperature gradients on the dynamics of the three-phase contact line. By simultaneously tracking the dynamic evolution of the three-phase contact line due to the evaporation and diffusion of molecules through molecular dynamics simulations, we explore the coterminous effects of the change of surface tension coefficients and wetting parameters with temperature on sessile droplets residing on surfaces with different wettabilities...
August 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28819378/hif-is-not-essential-for-suppression-of-experimental-tumor-growth-by-mtor-inhibition
#20
Karl X Knaup, Regina Guenther, Johanna Stoeckert, Juliana M Monti, Kai-Uwe Eckardt, Michael S Wiesener
The Hypoxia Inducible Transcription Factor (HIF) is the master regulator of cellular response to hypoxic adaptation. Solid tumors inevitably harbour hypoxic regions with subsequent stabilization and activation of HIF and HIF target genes due to poor vascularization and rapid growth. The mammalian target of rapamycin (mTOR) is a global regulator of cellular growth and proliferation, which can also regulate HIF expression independantly of hypoxia via specific activation of cellular translation and transcription...
2017: Journal of Cancer
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