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https://www.readbyqxmd.com/read/28326997/removal-of-phenol-by-powdered-activated-carbon-prepared-by-residue-extracted-from-coal-gasification-tar-residue
#1
Jun Shen, Xiong-Lei Wang, Yan-Xia Niu, Yu-Gao Wang, Gang Liu, Qing-Tao Sheng
coal gasification tar residue (CGTR) is a kind of environmentally hazardous by-product generated in fixed-bed coal gasification process. The extracted CGTR by ethyl acetate was used to prepare powdered activated carbon (PAC) and applied for phenol adsorption. The results showed that the prepared PAC under the optimum conditions had enormous mesoporous structure, and the iodine number reached 2030.11 mg/g, with specific surface area of 1981 m(2)/g and total pore volume of 0.92 ml/g. Especially, without loading other substances the PAC had a strong magnetic, easy to be separated after adsorbing phenol...
March 22, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28325686/errors-in-computing-the-normalized-protein-catabolic-rate-due-to-use-of-single-pool-urea-kinetic-modeling-or-to-omission-of-the-residual-kidney-urea-clearance
#2
John T Daugirdas
OBJECTIVES: The protein catabolic rate normalized to body size (PCRn) often is computed in dialysis units to obtain information about protein ingestion. However, errors can manifest when inappropriate modeling methods are used. METHODS: We used a variable volume 2-pool urea kinetic model to examine the percent errors in PCRn due to use of a 1-pool urea kinetic model or after omission of residual urea clearance (Kru). RESULTS: When a single-pool model was used, 2 sources of errors were identified...
March 18, 2017: Journal of Renal Nutrition
https://www.readbyqxmd.com/read/28324721/ultradispersed-nanoarchitecture-of-sns-nanoparticles-reduced-graphene-oxide-for-enhanced-sodium-storage-performance
#3
Junming Li, Xingxing Zhao, Zhian Zhang
SnSanodes for Na-ions (NIBs) batteries are known for theirs significantly high theoretical capacities involving conversion reactions and alloying/dealloying mechanisms. However, the large volume expansion of the SnS materials during electrode reactions and the lowelectrical conductivity could cause severe structural degradation and electrodes pulverization, consequently resulting in capacity fading. In this study, Ultradispersed nanoarchitecture of SnS nanoparticles/reduced graphene oxide (SnS/rGO) is prepared by the in situ growing SnS nanoparticles on the graphene followed by the thermal treatment...
March 15, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28324340/quantitative-18-f-fluorocholine-positron-emission-tomography-for-prostate-cancer-correlation-between-kinetic-parameters-and-gleason-scoring
#4
Joshua J D Schaefferkoetter, Ziting Wang, Mary C Stephenson, Sharmili Roy, Maurizio Conti, Lars Eriksson, David W Townsend, Thomas Thamboo, Edmund Chiong
BACKGROUND: The use of radiolabeled choline as a positron emission tomography (PET) agent for imaging primary tumors in the prostate has been evaluated extensively over the past two decades. There are, however, conflicting reports of its sensitivity and the relationship between choline PET imaging and disease staging is not fully understood. Moreover, relatively few studies have investigated the correlation between tracer uptake and histological tumor grade. This work quantified (18)F-fluorocholine in tumor and healthy prostate tissue using pharmacokinetic modeling and stratified uptake parameters by histology grade...
December 2017: EJNMMI Research
https://www.readbyqxmd.com/read/28323408/monodispersed-carbon-coated-cubic-nip2-nanoparticles-anchored-on-carbon-nanotubes-as-ultra-long-life-anodes-for-reversible-lithium-storage
#5
Peili Lou, Zhonghui Cui, Zhiqing Jia, Jiyang Sun, Yingbin Tan, Xiangxin Guo
In search of new electrode materials for lithium-ion batteries (LIB), metal phosphides that exhibit desirable properties such as high theoretical capacity, moderate discharge plateau and relative low polarization recently attract a great deal of attention as anode materials. However, the large volume changes and thus resulted collapse of electrode structure during long-term cycling are still the challenges for metal phosphide-based anodes. Here we report an electrode design strategy to solve these problems...
March 21, 2017: ACS Nano
https://www.readbyqxmd.com/read/28323351/baseline-knee-adduction-moment-interacts-with-body-mass-index-to-predict-loss-of-medial-tibial-cartilage-volume-over-2-5-years-in-knee-osteoarthritis
#6
Nicholas M Brisson, Emily G Wiebenga, Paul W Stratford, Karen A Beattie, Saara Totterman, José G Tamez-Peña, Jack P Callaghan, Jonathan D Adachi, Monica R Maly
This study aimed to determine the extent to which changes over 2.5 years in medial knee cartilage thickness and volume were predicted by: (1) peak values of the knee adduction (KAM) and flexion moments; and (2) KAM impulse and loading frequency, representing cumulative load, after controlling for age, sex and body mass index (BMI). Adults with clinical knee osteoarthritis participated. At baseline and approximately 2.5 years follow-up, cartilage thickness and volume of the medial tibia and femur were segmented from magnetic resonance imaging scans...
March 21, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/28322781/characterization-of-akr1b16-a-novel-mouse-aldo-keto-reductase
#7
Joan Giménez-Dejoz, Susanne Weber, Oleg A Barski, Gabriele Möller, Jerzy Adamski, Xavier Parés, Sergio Porté, Jaume Farrés
Aldo-keto reductases (AKRs) are distributed in three families and multiple subfamilies in mammals. The mouse Akr1b3 gene is clearly orthologous to human AKR1B1, both coding for aldose reductase, and their gene products show similar tissue distribution, regulation by osmotic stress and kinetic properties. In contrast, no unambiguous orthologs of human AKR1B10 and AKR1B15.1 have been identified in rodents. Although two more AKRs, AKR1B7 and AKR1B8, have been identified and characterized in mouse, none of them seems to exhibit properties similar to the human AKRs...
March 17, 2017: Chemico-biological Interactions
https://www.readbyqxmd.com/read/28318565/the-counterintuitive-role-of-extra-column-volume-in-the-determination-of-column-efficiency-and-scaling-of-chromatographic-processes
#8
A Schultze-Jena, M A Boon, P J Th Bussmann, A E M Janssen, A van der Padt
In industrial liquid separation processes chromatography often has a key function in the optimization of yield and purity. For the design of an industrial system, chromatographic processes are generally simulated using mathematical models, tested and optimized at laboratory level, and then scaled up to pilot and subsequently industrial scale. To describe the system, experimental data and model data need to be fitted and extra column contribution must be determined. This paper describes the influence of extra-column volume on overall separation efficiency for lab scale and its impact on the design of large scale systems...
March 1, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28301816/mao-enzymes-inhibitory-activity-of-new-benzimidazole-derivatives-including-hydrazone-and-propargyl-side-chains
#9
Özgür Devrim Can, Derya Osmaniye, Ümide Demir Özkay, Begüm Nurpelin Sağlık, Serkan Levent, Sinem Ilgın, Merve Baysal, Yusuf Özkay, Zafer Asım Kaplancıklı
In the present work, 15 new N'-(arylidene)-4-(1-(prop-2-yn-1-yl)-1H-benzo[d]imidazol-2-yl)benzohydrazide (4a-4o) were designed and synthesized. The structures of the synthesized compounds were elucidated using FT-IR, (1)H-NMR, (13)C-NMR, and HRMS spectral data. The inhibitory activity of the compounds 4a-4o against hMAO-A and hMAO-B enzymes was evaluated by using in vitro Amlex Red(®) reagent based fluorometric method. Due to lots of high-cost kits including this assay, we determined the ingredients of the kits from the data sheets of several suppliers, and adjusted a protocol by working with various concentrations and volumes of these ingredients...
March 8, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28301768/theory-and-modeling-of-rna-structure-and-interactions-with-metal-ions-and-small-molecules
#10
Li-Zhen Sun, Dong Zhang, Shi-Jie Chen
In addition to continuous rapid progress in RNA structure determination, probing, and biophysical studies, the past decade has seen remarkable advances in the development of a new generation of RNA folding theories and models. In this article, we review RNA structure prediction models and models for ion-RNA and ligand-RNA interactions. These new models are becoming increasingly important for a mechanistic understanding of RNA function and quantitative design of RNA nanotechnology. We focus on new methods for physics-based, knowledge-based, and experimental data-directed modeling for RNA structures and explore the new theories for the predictions of metal ion and ligand binding sites and metal iondependent RNA stabilities...
March 15, 2017: Annual Review of Biophysics
https://www.readbyqxmd.com/read/28301739/systems-biology-of-metabolism
#11
Jens Nielsen
Metabolism is highly complex and involves thousands of different connected reactions; it is therefore necessary to use mathematical models for holistic studies. The use of mathematical models in biology is referred to as systems biology. In this review, the principles of systems biology are described, and two different types of mathematical models used for studying metabolism are discussed: kinetic models and genome-scale metabolic models. The use of different omics technologies, including transcriptomics, proteomics, metabolomics, and fluxomics, for studying metabolism is presented...
March 8, 2017: Annual Review of Biochemistry
https://www.readbyqxmd.com/read/28300014/single-ion-deconvolution-of-mass-peak-overlaps-for-atom-probe-microscopy
#12
Andrew J London, Daniel Haley, Michael P Moody
Due to the intrinsic evaporation properties of the material studied, insufficient mass-resolving power and lack of knowledge of the kinetic energy of incident ions, peaks in the atom probe mass-to-charge spectrum can overlap and result in incorrect composition measurements. Contributions to these peak overlaps can be deconvoluted globally, by simply examining adjacent peaks combined with knowledge of natural isotopic abundances. However, this strategy does not account for the fact that the relative contributions to this convoluted signal can often vary significantly in different regions of the analysis volume; e...
March 16, 2017: Microscopy and Microanalysis
https://www.readbyqxmd.com/read/28298664/the-impact-of-roller-pump-vs-centrifugal-pump-on-homologous-blood-transfusion-in-pediatric-cardiac-surgery
#13
Bharat Datt, Moui B Nguyen, Gary Plancher, Mark Ruzmetov, Michael O'Brien, Alicia Kube, Hamish M Munro, Kamal K Pourmoghadam, William M DeCampli
Centrifugal pumps are considered to be less destructive to blood elements (1) when compared to roller pumps. However, their large prime volumes render them unsuitable as arterial pumps in heart lung machine (HLM) circuitry for children. In November of 2014, the circuit at Arnold Palmer Hospital, a Biomedicus BP-50 with kinetic assist venous drainage (KAVD) and 1/4″ tubing was converted to a roller pump in the arterial position with gravity drainage. Vacuum-assisted venous drainage (VAVD) was mounted on the HLM as a backup, but not used...
March 2017: Journal of Extra-corporeal Technology
https://www.readbyqxmd.com/read/28298091/theoretical-volume-profiles-for-conformational-changes-application-to-internal-rotation-of-benzene-ring-in-1-12-dimethoxy-12-paracyclophane
#14
Heather Wiebe, Miranda Louwerse, Noham Weinberg
Identification of the transition state is an important step in the study of reaction kinetics and mechanisms. However, for non-rigid chemical systems where multiple viable reaction pathways may exist, enumeration of all possible transition states quickly becomes computationally expensive, if at all feasible. As an alternative approach, we recently proposed a methodology where the volumetric properties of a flexible reaction system are used to locate its transition state ensemble through a comparison of its theoretically determined volume profile and experimental activation volumes derived from high pressure kinetic data...
March 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28297943/phase-coarsening-in-multicomponent-systems
#15
K G Wang, Gabriel Q Wang
A theory for phase coarsening in multicomponent systems is developed in which both the multicomponent thermodynamic effect and kinetic effect from a nonzero volume fraction are considered. In contrast to previous theory, a diffusion screening zone for a coarsening particle due to nonzero volume fraction is introduced. The evolution equation for phase coarsening in multicomponent systems is derived in a rigorous way in the framework of the maximum rate of dissipation with the constraints of mass and energy conservation...
February 2017: Physical Review. E
https://www.readbyqxmd.com/read/28293274/optimally-repeatable-kinetic-model-variant-for-myocardial-blood-flow-measurements-with-82-rb-pet
#16
Adrian F Ocneanu, Robert A deKemp, Jennifer M Renaud, Andy Adler, Rob S B Beanlands, Ran Klein
Purpose. Myocardial blood flow (MBF) quantification with (82)Rb positron emission tomography (PET) is gaining clinical adoption, but improvements in precision are desired. This study aims to identify analysis variants producing the most repeatable MBF measures. Methods. 12 volunteers underwent same-day test-retest rest and dipyridamole stress imaging with dynamic (82)Rb PET, from which MBF was quantified using 1-tissue-compartment kinetic model variants: (1) blood-pool versus uptake region sampled input function (Blood/Uptake-ROI), (2) dual spillover correction (SOC-On/Off), (3) right blood correction (RBC-On/Off), (4) arterial blood transit delay (Delay-On/Off), and (5) distribution volume (DV) constraint (Global/Regional-DV)...
2017: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/28290121/population-pharmacokinetic-analysis-of-ixazomib-an-oral-proteasome-inhibitor-including-data-from-the-phase-iii-tourmaline-mm1-study-to-inform-labelling
#17
Neeraj Gupta, Paul M Diderichsen, Michael J Hanley, Deborah Berg, Helgi van de Velde, R Donald Harvey, Karthik Venkatakrishnan
Ixazomib is an oral proteasome inhibitor, approved in USA, Canada, Australia and Europe in combination with lenalidomide and dexamethasone, for the treatment of patients with multiple myeloma who have received at least one prior therapy. We report a population pharmacokinetic model-based analysis for ixazomib that was pivotal in describing the clinical pharmacokinetics of ixazomib, to inform product labelling. Plasma concentration-time data were collected from 755 patients who received oral or intravenous ixazomib in once- or twice-weekly schedules in ten trials, including the global phase III TOURMALINE-MM1 study...
March 13, 2017: Clinical Pharmacokinetics
https://www.readbyqxmd.com/read/28285197/graphene-oxide-functionalized-long-period-grating-for-ultrasensitive-label-free-immunosensing
#18
Chen Liu, Qi Cai, Baojian Xu, Weidong Zhu, Lin Zhang, Jianlong Zhao, Xianfeng Chen
We explore graphene oxide (GO) nanosheets functionalized dual-peak long period grating (dLPG) based biosensor for ultrasensitive label-free antibody-antigen immunosensing. The GO linking layer provides a remarkable analytical platform for bioaffinity binding interface due to its favorable combination of exceptionally high surface-to-volume ratio and excellent optical and biochemical properties. A new GO deposition technique based on chemical-bonding in conjunction with physical-adsorption was proposed to offer the advantages of a strong bonding between GO and fiber device surface and a homogeneous GO overlay with desirable stability, repeatability and durability...
March 9, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28283654/a-model-based-personalized-cancer-screening-strategy-for-detecting-early-stage-tumors-using-blood-borne-biomarkers
#19
Sharon Seiko Hori, Amelie M Lutz, Ramasamy Paulmurugan, Sanjiv S Gambhir
An effective cancer blood biomarker screening strategy must distinguish aggressive from non-aggressive tumors at an early, intervenable time. However, for blood-based strategies to be useful, the quality and quantiy of the biomarker shed into the blood and its relationship to tumor growth or progression must be validated. To study how blood biomarker levels correlate with early-stage viable tumor growth in an mouse model of human cancer, we monitored early tumor growth of engineered human ovarian cancer cells (A2780) implanted orthotopically into nude mice...
March 10, 2017: Cancer Research
https://www.readbyqxmd.com/read/28279909/preparation-of-biochar-by-simultaneous-carbonization-magnetization-and-activation-for-norfloxacin-removal-in-water
#20
Bo Wang, Yan-Song Jiang, Fa-Yun Li, Deng-Yue Yang
Activated magnetic biochar (AMB) was prepared with corn stalks, reed stalks, and willow branches by simultaneous carbonization, magnetization, and activation, and used for norfloxacin removal in water. The exploration results showed that the zeta potential was positively charged at pH 2-10. These prepared activated magnetic biochars have a large specific surface area (>700m(2)·g(-1)) and pore volume (>0.3cm(3)·g(-1)). The quasi-second-order kinetic adsorption equation could better describe the adsorption of NOR on AMB...
February 27, 2017: Bioresource Technology
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