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https://www.readbyqxmd.com/read/28096442/kinetic-modeling-of-incremental-ambulatory-peritoneal-dialysis-exchanges
#1
Steven Guest, John K Leypoldt, Michelle E Cassin, Martin J Schreiber
♦ Background: Incremental peritoneal dialysis (PD), the gradual introduction of dialysate exchanges at less than full-dose therapy, has been infrequently described in clinical reports. One concern with less than full-dose dialysis is whether urea clearance targets are achievable with an incremental regimen. In this report, we used a large database of PD patients, across all membrane transport types, and performed urea kinetic modeling determinations of possible incremental regimens for an individual membrane type...
January 17, 2017: Peritoneal Dialysis International: Journal of the International Society for Peritoneal Dialysis
https://www.readbyqxmd.com/read/28096440/tnf-signaling-in-peritoneal-mesothelial-cells-pivotal-role-of-cflipl
#2
Willie M Lüdemann, Danijela Heide, Lars Kihm, Martin Zeier, Peter Scheurich, Vedat Schwenger, Julia Ranzinger
♦ Background: Peritoneal dialysis (PD) coincides with high concentrations of proinflammatory cytokines, such as tumor necrosis factor (TNF), in the peritoneal cavity. During treatment, chronic inflammatory processes lead to damage of the peritoneal membrane and a subsequent ultrafiltration failure. Human peritoneal mesothelial cells (HPMCs) play a central role as mediators and targets of PD-related inflammatory changes. Although TNF Receptor 1 (TNFR1) is expressed in high numbers on the cells, TNF-induced apoptosis is inhibited...
January 17, 2017: Peritoneal Dialysis International: Journal of the International Society for Peritoneal Dialysis
https://www.readbyqxmd.com/read/28095918/anti-staphylococcal-activity-resulting-from-epithelial-lining-fluid-elf-concentrations-of-amikacin-inhale-administered-via-the-pulmonary-drug-delivery-system
#3
Islam M Ghazi, Mordechai Grupper, David P Nicolau
BACKGROUND: Amikacin inhale (BAY41-6551), a unique drug-device combination of a specially formulated drug solution and a pulmonary drug delivery system device (AMK-I) is currently under phase III study as an adjunctive therapy to IV antibiotics for the treatment of Gram-negative pneumonia in mechanically ventilated patients. While the epidemiology of nosocomial pneumonia is predominated by Gram-negative pathogens such as Pseudomonas aeruginosa and the Enterobacteriaceae, Staphylococcus aureus is increasingly recognized as a pathogen of concern for these pulmonary based infections...
January 17, 2017: Annals of Clinical Microbiology and Antimicrobials
https://www.readbyqxmd.com/read/28078632/fluorescent-carbon-dot-as-nanosensor-for-sensitive-and-selective-detection-of-cefixime-based-on-inner-filter-effect
#4
Farhad Akhgari, Naser Samadi, Khalil Farhadi
Here a simple and sensitive fluorescent assay for detecting Cefixime based on inner filter effect (IFE) has been proven, which is conceptually different from the previously reported CEF fluorescent assays. In this sensing platform, fluorescent carbon dots (CDs) were prepared by one-pot synthesis and was directly used as fluorophore in IFE. The method is based on the complexation reaction between cefixime and palladium ion in the presence of acidic buffer solution (pH 4). The Pd(II)-CEFcomplex was capable of functioning as a powerful absorber in IFE to influence the excitation of fluorophore (CDs)...
January 11, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28075127/homeomorphic-isomerization-as-a-design-element-in-con-tainer-molecules-binding-displacement-and-selective-transport-of-mcl2-species-m-pt-pd-ni
#5
Sugam Kharel, Hemant Joshi, Stephen Bierschenk, Michael Stollenz, Deeb Taher, Nattamai Bhuvanesh, John A Gladysz
The dibridgehead diphosphine P((CH2)14)3P (1) can rapidly turn itself inside-out (homeomorphic isomerization) to give a mixture of in,in and out,out isomers. The exo directed lone pairs in the latter are able to scavenge Lewis acidic MCl2; cage like adducts of the in,in isomer, trans-MCl2(P((CH2)14)3P) (M = 2/Pt, 3/Pd, 4/Ni), then form. The NiCl2 unit in 4 (which is crystallographically characterized) may be replaced by PtCl2 or PdCl2, but 2 and 3 do not give similar substitutions. U-tubes are charged with CH2Cl2 solutions of 1 (lower phase), an aqueous solution of K2MCl4 (charging arm; M = Pt, Pd), and an aqueous solution of excess KCl (receiving arm)...
January 11, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28054684/sandwich-and-half-sandwich-metal-complexes-derived-from-cross-conjugated-3-methylene-penta-1-4-diynes
#6
Kevin B Vincent, Josef B G Gluyas, Qiang Zeng, Dmitry S Yufit, Judith A K Howard, František Hartl, Paul J Low
The cross-conjugated ethynyl-vinylidene [Ph2C[double bond, length as m-dash]C(C[triple bond, length as m-dash]CH){C(H)[double bond, length as m-dash]CRu(PPh3)2Cp}]PF6 ([4a]PF6), and [FcC(H)[double bond, length as m-dash]C(C[triple bond, length as m-dash]CH){C(H)[double bond, length as m-dash]CRu(PPh3)2Cp}]PF6 ([4b]PF6), and ethynyl-alkynyl Ph2C[double bond, length as m-dash]C(C[triple bond, length as m-dash]CH){C[triple bond, length as m-dash]CRu(PPh3)2Cp} (5a), and FcC(H)[double bond, length as m-dash]C(C[triple bond, length as m-dash]CH){C[triple bond, length as m-dash]CRu(PPh3)2Cp} (5b) compounds (Cp = η(5)-cyclopentadienyl) have been prepared from reactions of the known 3-methylene-penta-1,4-diynes Ph2C[double bond, length as m-dash]C(C[triple bond, length as m-dash]CH)2 (3a) and [FcCH[double bond, length as m-dash]C(C[triple bond, length as m-dash]CH)2] (3b) with [RuCl(PPh3)2Cp]...
January 5, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28045434/recent-advances-in-pd-based-membranes-for-membrane-reactors
#7
REVIEW
Alba Arratibel Plazaola, David Alfredo Pacheco Tanaka, Martin Van Sint Annaland, Fausto Gallucci
Palladium-based membranes for hydrogen separation have been studied by several research groups during the last 40 years. Much effort has been dedicated to improving the hydrogen flux of these membranes employing different alloys, supports, deposition/production techniques, etc. High flux and cheap membranes, yet stable at different operating conditions are required for their exploitation at industrial scale. The integration of membranes in multifunctional reactors (membrane reactors) poses additional demands on the membranes as interactions at different levels between the catalyst and the membrane surface can occur...
January 1, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28045166/carborane-stilbene-dyads-the-influence-of-substituents-and-cluster-isomers-on-photoluminescence-properties
#8
A Ferrer-Ugalde, J Cabrera-González, E J Juárez-Pérez, F Teixidor, E Pérez-Inestrosa, J M Montenegro, R Sillanpää, M Haukka, R Núñez
Two novel styrene-containing meta-carborane derivatives substituted at the second carbon cluster atom (Cc) with either a methyl (Me) or a phenyl (Ph) group are introduced herein along with a new set of stilbene-containing ortho- (o-) and meta- (m-) carborane dyads. The latter set of compounds have been prepared from styrene-containing carborane derivatives via a Heck coupling reaction. High regioselectivity has been achieved for these compounds by using a combination of palladium complexes [Pd2(dba)3]/[Pd(t-Bu3P)2] as a catalytic system, yielding exclusively E isomers...
January 3, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28044155/proton-driven-coordination-induced-spin-state-switch-pd-cisss-of-iron-ii-complexes
#9
René Nowak, Eko Adi Prasetyanto, Luisa De Cola, Beate Bojer, Renée Siegel, Jürgen Senker, Ernst Rössler, Birgit Weber
Here we report the completely reversible spin state switch of the naturally diamagnetic tris(bipyridine)iron(ii) complex and the spin crossover complex bis(2,6-bis(1H-pyrazol-3-yl)pyridine)iron(ii) by the variation of the pH followed by (1)H-NMR, UV-Vis spectroscopy, and magnetic and relaxivity measurements in solution and as composite materials encapsulated in a zeolite matrix.
January 3, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28040539/prediction-of-the-adsorption-capacities-for-four-typical-organic-pollutants-on-activated-carbons-in-natural-waters
#10
Warisa Bunmahotama, Wei-Nung Hung, Tsair-Fuh Lin
A new model is developed to predict the competitive adsorption isotherms of atrazine, methyl tertiary butyl ether (MTBE), 2-methylisoborneol (2-MIB) and 2,4,6-trichlorophenol onto activated carbons (ACs) in natural water. Based on the Polanyi-Dubinin (PD) equation, with the limiting pore volume of adsorbent estimated from the pore size distribution data, and the Ideal adsorbed solution theory - equivalent background compound (IAST-EBC) model approximation, the model takes into account both the properties of ACs and the impact of natural organic matters in water...
December 21, 2016: Water Research
https://www.readbyqxmd.com/read/28038738/biosorption-and-reduction-of-au-iii-to-gold-nanoparticles-by-thiourea-modified-alginate
#11
Xiangpeng Gao, Yan Zhang, Yuming Zhao
In this study, modified alginate biosorbent has shown a remarkably selective adsorption of Au (III) ions from multi-metallic solutions containing equal moles of Au (III), Pd (II), Pt (IV), Co (II), Ni (II) and Cu (II) ions under acidic conditions. The maximum uptake capacity of Au (III) was found to be 8.47mmolg(-1) at 323.15K. Adsorption of Au (III) by modified alginate biosorbent was accompanied by chemical reduction of Au (III), leading to the formation of gold nanocrystals and microcrystals. Biosorption and reduction of Au (III) in acidic media are mediated by the electrostatic and covalent interactions between Au (III) and hydroxyl, carboxyl, amino and CS functional groups of modified alginate adsorbent...
March 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28038418/kinetic-and-thermodynamic-studies-of-the-co-ii-and-ni-ii-ions%C3%A2-removal-from-aqueous-solutions-by-ca-mg-phosphates
#12
A I Ivanets, V Srivastava, N V Kitikova, I L Shashkova, M Sillanpää
The aim of this work was to study the sorption kinetics and thermodynamics of Co(II) and Ni(II) from aqueous solutions by sorbents on the basis of hydrogen (PD-1) and tertiary (PD-2) Ca-Mg phosphates depending on the solution temperature and sorbents chemical composition. Kinetic studies of adsorption of Co(II) and Ni(II) ions onto samples of phosphate sorbents were performed in batch experiment at the temperatures 288, 303, 318 and 333 K. The sorbent dose was fixed at 10 g L(-1), initial pH value 2.6, and contact time varied from 5 to 600 min...
December 20, 2016: Chemosphere
https://www.readbyqxmd.com/read/28031207/pharmacokinetics-pharmacodynamics-of-pulmonary-delivery-of-colistin-against-pseudomonas-aeruginosa-in-a-mouse-lung-infection-model
#13
Yu-Wei Lin, Qi Tony Zhou, Soon-Ee Cheah, Jinxin Zhao, Ke Chen, Jiping Wang, Hak-Kim Chan, Jian Li
Colistin is often administered by inhalation and/or parenteral route for the treatment of respiratory infections caused by multidrug-resistant (MDR) Pseudomonas aeruginosa However, limited pharmacokinetic (PK) and pharmacodynamic (PD) data are available to guide the optimization of dosage regimens of inhaled colistin. In the present study, PK of colistin in epithelial lining fluid (ELF) and plasma was determined following intra-tracheal delivery of a single dose of colistin solution in neutropenic lung-infected mice...
December 28, 2016: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28024573/l-dopa-co-drugs-in-nanostructured-lipid-carriers-a-comparative-study
#14
Rita Cortesi, Elisabetta Esposito, Markus Drechsler, Gabriella Pavoni, Ivana Cacciatore, Maddalena Sguizzato, Antonio Di Stefano
This paper describes the production and characterization of nanostructured lipid carriers (NLC) containing four different levodopa (LD) co-drugs (PD), named PDA (3,4-diacetyloxy-LD-caffeic acid co-drug), PDB (lipoic acid-dopamine co-drug), PDC (lipoic acid-3,4-diacetoxy-dopamine co-drug), and PDD (dimeric LD co-drug containing an alkyl linker), with therapeutic potential in Parkinson's disease. These co-drugs were produced with the aim of prolonging the pharmacological activity of LD, enhancing its absorption and protecting it from metabolism...
March 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28024449/effects-of-different-force-fields-on-the-structural-character-of-%C3%AE-synuclein-%C3%AE-hairpin-peptide-35-56-in-aqueous-environment
#15
Sangeeta Kundu
The hallmark of Parkinson's disease (PD) is the intracellular protein aggregation forming Lewy Bodies (LB) and Lewy neuritis which comprise mostly of a protein, alpha synuclein (α-syn). Molecular dynamics (MD) simulation methods can augment experimental techniques to understand misfolding and aggregation pathways with atomistic resolution. The quality of MD simulations for proteins and peptides depends greatly on the accuracy of empirical force fields. The aim of this work is to investigate the effects of different force fields on the structural character of β hairpin fragment of α-syn (residues 35-56) peptide in aqueous solution...
December 26, 2016: Journal of Biomolecular Structure & Dynamics
https://www.readbyqxmd.com/read/28013538/sb-ni12-sb20-and-sb-pd12-sb20-n-cluster-anions-where-n-1-1-3-4-multi-oxidation-state-clusters-of-interpenetrating-platonic-solids
#16
Yi Wang, Melanie Moses-DeBusk, Lauren Stevens, Junkai Hu, Peter Zavalij, Kit Bowen, Brett I Dunlap, Evan R Glaser, Bryan Eichhorn
K5Sb4 and K3Sb7 Zintl ion precursors react with Pd(PPh3)4 in ethylenediamine/toluene/PBu4(+) solutions to give crystals of Sb@Pd12@Sb20(n-)/PBu4(+) salts, where n = 3, 4. The clusters are structurally identical in the two charge states, with nearly perfect Ih point symmetry, and can be viewed as an Sb@Pd12 icosahedron centered inside of an Sb20 dodecahedron. The metric parameters suggest very weak Sb-Sb and Pd-Pd interactions with strong radial Sb-Pd bonds between the Sb20 and Pd12 shells. All-electron DFT analysis shows the 3- ion to be diamagnetic with Ih symmetry and a 1...
January 18, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28012100/the-peritoneal-sieving-of-sodium-a-simple-and-powerful-test-to-rule-out-the-onset-of-encapsulating-peritoneal-sclerosis-in-patients-undergoing-peritoneal-dialysis
#17
Vincenzo La Milia, Selena Longhi, Elisabetta Sironi, Giuseppe Pontoriero
BACKGROUND AND AIMS: Encapsulating peritoneal sclerosis (EPS) is an uncommon but severe complication of peritoneal dialysis (PD). A reliable screening tool to identify patients at risk of developing or not EPS is currently not available. We aimed to evaluate whether the reduction in dialysate sodium concentration (sodium sieving) at 60 min (ΔDNa60), during a peritoneal equilibration test with 3.86% glucose concentration (3.86%-PET) was able to early rule out patients who will not develop EPS...
December 24, 2016: Journal of Nephrology
https://www.readbyqxmd.com/read/28011432/challenges-in-quantitative-crystallographic-characterization-of-3d-thin-films-by-acom-tem
#18
A Kobler, C Kübel
Automated crystal orientation mapping for transmission electron microscopy (ACOM-TEM) has become an easy to use method for the investigation of crystalline materials and complements other TEM methods by adding local crystallographic information over large areas. It fills the gap between high resolution electron microscopy and electron back scatter diffraction in terms of spatial resolution. Recent investigations showed that spot diffraction ACOM-TEM is a quantitative method with respect to sample parameters like grain size, twin density, orientation density and others...
July 5, 2016: Ultramicroscopy
https://www.readbyqxmd.com/read/28004438/polycyclopentene-crystal-decorated-carbon-nanotubes-by-convenient-large-scale-in-situ-polymerization-and-their-lotus-leaf-like-superhydrophobic-films
#19
Lixin Xu, Lingqi Huang, Zhibin Ye, Nan Meng, Yang Shu, Zhiyong Gu
In situ Pd-catalyzed cyclopentene polymerization in the presence of multi-walled carbon nanotubes (MWCNTs) is demonstrated to effectively render, on a large scale, polycyclopentene-crystal-decorated MWCNTs. Controlling the catalyst loading and/or time in the polymerization offers a convenient tuning of the polymer content and the morphology of the decorated MWCNTs. Appealingly, films made of the decorated carbon nanotubes through simple vacuum filtration show the characteristic lotus-leaf-like superhydrophobicity with high water contact angle (>150°), low contact angle hysteresis (<10°), and low water adhesion, while being electrically conductive...
December 22, 2016: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28004069/-emodin-ameliorates-the-peritoneal-dialysis-related-peritoneal-fibrosis-via-inhibiting-the-activation-of-notch-pathway
#20
Hui-Chao Wang, Xu-Hong Lin, Xiao-Peng Fang, Xiao-Yun Mu, Tie-Jun Li, Jian-Lin Liu
Long term peritoneal dialysis (PD) is often associated with peritoneal fibrosis. The aim of this study was to explore the effect of emodin on PD-related peritoneal fibrosis and its related cellular and molecular mechanism. PD-related peritoneal fibrosis rats and cultured rat peritoneal mesothelial cells were recruited in the experiment. PD-related peritoneal fibrosis was induced by intraperitoneal injection of lactate-buffered solution containing 4.25% glucose. The peritoneal equilibrium test (PET) was performed at the end of 2 weeks, 4 weeks, and 6 weeks, respectively...
December 25, 2016: Sheng Li Xue Bao: [Acta Physiologica Sinica]
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