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https://www.readbyqxmd.com/read/28339935/nephrotoxicity-of-anticancer-treatment
#1
Jolanta Malyszko, Klaudia Kozlowska, Leszek Kozlowski, Jacek Malyszko
Severe adverse systemic drug events occur commonly as a result of treatment of cancer patients. Nephrotoxicity of chemotherapeutic agents remains a significant complication limiting the efficacy of the treatment. A variety of renal disease and electrolyte disorders can result from the drugs that are used to treat malignant disease. The kidneys are a major elimination pathway for many antineoplastic drugs and their metabolites. Tumour lysis syndrome, an emergency in haematooncology, occurs most often after the initiation of cytotoxic therapy in patients with high-grade lymphomas and acute lymphoblastic leukaemia...
October 6, 2016: Nephrology, Dialysis, Transplantation
https://www.readbyqxmd.com/read/28338762/redox-and-reactive-oxygen-species-network-in-acclimation-for-salinity-tolerance-in-sugar-beet
#2
M Sazzad Hossain, Abdelaleim Ismail ElSayed, Marten Moore, Karl-Josef Dietz
Fine-tuned and coordinated regulation of transport, metabolism and redox homeostasis allows plants to acclimate to osmotic and ionic stress caused by high salinity. Sugar beet is a highly salt tolerant crop plant and is therefore an interesting model to study sodium chloride (NaCl) acclimation in crops. Sugar beet plants were subjected to a final level of 300 mM NaCl for up to 14 d in hydroponics. Plants acclimated to NaCl stress by maintaining its growth rate and adjusting its cellular redox and reactive oxygen species (ROS) network...
February 18, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/28337908/detection-of-2-4-6-trinitrotoluene-using-a-miniaturized-disposable-electrochemical-sensor-with-an-ionic-liquid-gel-polymer-electrolyte-film
#3
Holly A Yu, Junqiao Lee, Simon W Lewis, Debbie Sue Silvester
A new electrochemical method to detect and quantify the explosive compound 2,4,6-trinitrotoluene (TNT) in aqueous solutions is demonstrated. A disposable thin-film electrode modified with a droplet of a gel-polymer electrolyte (GPE) was immersed directly into samples of TNT at concentrations of 1-10 μg/mL. The GPE contained the hydrophobic room temperature ionic liquid (RTIL) trihexyltetradecylphosphonium bis(trifluoromethylsulfonyl)imide ([P14,6,6,6][NTf2]) and the polymer poly(hexyl methacrylate) (PHMA)...
March 24, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28332659/hydration-controlled-anisotropic-and-giant-permittivity-in-teg-functionalized-eumelanin
#4
Marianna Ambrico, Paolo F Ambrico, Teresa Ligonzo, Antonio Cardone, Maria Grazia Bridelli, Giuseppe Casamassima, Paola Manini, Marco d'Ischia
Although it has long been known that the peculiar electronic-ionic conductor behavior of eumelanin is critically dependent on hydration, the detailed mechanisms by which water-polymer interactions control and affect the conduction properties have remained largely obscure. In this paper, we report a remarkable anisotropy and giant polarization effect in a synthetic eumelanin (TEGMe) chemically functionalized with hydrophilic TEG residues. FT-IR analyses of water sorption isotherms and AC measurements were consistent with a microporous structure binding or hosting mainly isolated water molecules...
March 23, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28320487/the-application-of-contrast-media-for-in-vivo-feature-enhancement-in-x-ray-computed-tomography-of-soil-grown-plant-roots
#5
Samuel D Keyes, Neil J Gostling, Jessica H Cheung, Tiina Roose, Ian Sinclair, Alan Marchant
The use of in vivo X-ray microcomputed tomography (μCT) to study plant root systems has become routine, but is often hampered by poor contrast between roots, soil, soil water, and soil organic matter. In clinical radiology, imaging of poorly contrasting regions is frequently aided by the use of radio-opaque contrast media. In this study, we present evidence for the utility of iodinated contrast media (ICM) in the study of plant root systems using μCT. Different dilutions of an ionic and nonionic ICM (Gastrografin 370 and Niopam 300) were perfused into the aerial vasculature of juvenile pea plants via a leaf flap (Pisum sativum)...
March 21, 2017: Microscopy and Microanalysis
https://www.readbyqxmd.com/read/28318001/contrasting-diffusion-behaviors-of-o-and-f-atoms-on-graphene-and-within-bilayer-graphene
#6
Seho Yi, Jin-Ho Choi, Hyun-Jung Kim, Chul Hong Park, Jun-Hyung Cho
Chemical modification of graphene with adatoms is of importance for nanoelectronics applications. Based on first-principles density-functional theory calculations including van der Waals interactions, we present a comparative study of the diffusion characteristics of oxygen (O) and fluorine (F) atoms both on graphene and between the layers of bilayer graphene. We find that the calculated diffusion barrier for the O atom increases slightly from 0.81 eV on graphene to 0.85 eV within bilayer graphene, while that for the F atom largely decreases from 0...
March 20, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28315582/ionic-liquid-assisted-synthesis-of-composition-tunable-cross-linked-agpt-aerogels-with-enhanced-electrocatalysis
#7
Jiu-Ju Feng, Xiao-Xiao Lin, Li-Xian Chen, Meng-Ting Liu, Junhua Yuan, Ai-Jun Wang
A facile one-pot coreduction strategy was developed to synthesize composition-tunable cross-linked AgPt aerogels, where ionic liquid (1-aminopropyl-3-methylimidazolium bromide, [APMIm]Br) played a significant role in controlling the morphology and structure. During the synthesis progress, Br(-) easily reacted with Ag(+) to form AgBr precipitate and consequently slowed down the reducing rate of Ag(+), as well as acting as a capping agent to promote the anisotropic growth of AgPt aerogels, as mainly demonstrated by the electronic microscopy, Brunauer-Emmett-Teller, X-ray diffraction and X-ray photoelectron spectroscopy analysis...
March 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28306544/acute-ischemic-stroke-mimicking-subarachnoid-hemorrhage-after-coronary-angioplasty
#8
Ana Pršić, Tomislav Šipić, Krešimr Štambuk, Hrvoje Budinčević
Use of non-ionic contrast media (CM) in coronary arteriography has been reported to cause transient cortical blindness, confusion, amnesia and very rare focal deficits. We report a 69-year old patient with stabile angina pectoris who underwent coronary angioplasty with stent placement due to in-stent thrombosis of the right coronary artery who developed stroke symptoms with radiological suspicion of subarachnoid hemorrhage. No vascular malformations were detected on CT cerebral angiography. Dual antiplatelet treatment was continued...
March 16, 2017: Romanian Journal of Internal Medicine, Revue Roumaine de Médecine Interne
https://www.readbyqxmd.com/read/28297899/wall-depletion-length-of-a-channel-confined-polymer
#9
Guo Kang Cheong, Xiaolan Li, Kevin D Dorfman
Numerous experiments have taken advantage of DNA as a model system to test theories for a channel-confined polymer. A tacit assumption in analyzing these data is the existence of a well-defined depletion length characterizing DNA-wall interactions such that the experimental system (a polyelectrolyte in a channel with charged walls) can be mapped to the theoretical model (a neutral polymer with hard walls). We test this assumption using pruned-enriched Rosenbluth method (PERM) simulations of a DNA-like semiflexible polymer confined in a tube...
February 2017: Physical Review. E
https://www.readbyqxmd.com/read/28287571/merging-ion-concentration-polarization-between-juxtaposed-ion-exchange-membranes-to-block-the-propagation-of-the-polarization-zone
#10
Minyoung Kim, Hyunjoon Rhee, Ji Yoon Kang, Tae Song Kim, Rhokyun Kwak
The ion concentration polarization (ICP) phenomenon is one of the most prevailing methods to preconcentrate low-abundance biological samples. The ICP induces a noninvasive region for charged biomolecules (i.e., the ion depletion zone), and targets can be preconcentrated on this region boundary. Despite the high preconcentration performances with ICP, it is difficult to find the operating conditions of non-propagating ion depletion zones. To overcome this narrow operating window, we recently developed a new platform for spatiotemporally fixed preconcentration...
February 23, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28281254/gold-nanorod-array-biochip-for-label-free-multiplexed-biological-detection
#11
Zhong Mei, Yanyan Wang, Liang Tang
Gold nanorod (GNR) based label-free sensing has been attractive due to its unique property of localized surface plasmon resonance (LSPR). Compared to bulk gold, the SPR of GNRs is more sensitive to the refractive index change caused by biological binding in the close proximity. Numerous studies have reported biological detection in solution based GNR probes. However, the biosensing has the intrinsic problems of fluctuating readings and short storage time due to nanoparticle aggregation. In contrast, a chip-based nanorod biosensor is a more robust and reliable platform...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28277672/linear-and-star-poly-ionic-liquid-assemblies-surface-monolayers-and-multilayers
#12
Andrew J Erwin, Weinan Xu, Hongkun He, Krzysztof Matyjaszewski, Vladimir V Tsukruk
The surface morphology and organization of poly(ionic liquid)s (PILs), poly[1-(4-vinylbenzyl)-3-butylimidazolium bis-(trifluoromethylsulfonyl)imide] (poly(VBBI+Tf2N-), are explored in conjunction to their molecular architecture, preparation conditions, and post-assembly treatments. The formation of stable PIL Langmuir and Langmuir-Blodgett (LB) monolayers at the air-water and air-solid interfaces is demonstrated. The hydrophobic Tf2N- is shown to be a critical agent governing assembly morphology, as observed in the reversible condensation of LB monolayers into dense nanodroplets...
March 9, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28267511/enhancing-cellulose-dissolution-in-ionic-liquid-by-solid-acid-addition
#13
Yahui Meng, Zhiqiang Pang, Cuihua Dong
It's challenging to dissolve natural cellulose in most solvents due to its highly ordered crystalline structure. In this paper, we developed an efficient cellulose dissolution system which incorporates solid acid (SA) with 1-butyl-3-methylimidizolium chloride (BmimCl). The results showed that addition of solid acid both Amberlyst(®) 15 and CsxH3-xPW12O40 could significantly enhance cellulose dissolution in BmimCl, which attributed to the synergistic action of free hydrogen proton from SA and chloride anion in BmimCl on hydroxyl groups of cellulose, and DMF as co-solvent also could facilitate cellulose dissolution in SA/BmimCl...
May 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28267332/complexation-between-dna-and-hydrophilic-cationic-diblock-copolymers
#14
Seyoung Jung, Timothy P Lodge, Theresa M Reineke
We examine connections among polycation composition, DNA-polycation binding thermodynamics, binding strength, and resulting complex properties, for circular and linear DNA and hydrophilic diblock copolymers possessing cationic blocks. Two poly(2-deoxy-2-methacrylamido glucopyranose)-block-poly(N-(2-aminoethyl) methacrylamide) (PMAG-b-PAEMA), with block degrees of polymerization of PMAG56-b-PAEMA30 and PMAG52-b-PAEMA63, are employed. DNA binding behavior of these diblocks is also compared with that of a PAEMA homopolymer, in order to evaluate the role of the hydrophilic, charge-neutral PMAG block...
March 7, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28263591/chain-folding-produces-a-multilayered-morphology-in-a-precise-polymer-simulations-and-experiments
#15
Edward B Trigg, Mark J Stevens, Karen I Winey
Precise control over polymer architecture unlocks the potential for engineered self-assembled crystal structures with useful features on the nanometer length scale. Here we elucidate the structure of the ordered phase of a semicrystalline, functional polyethylene having a precise linear architecture, namely, pendant carboxylic acid groups precisely every 21st backbone carbon atom. By comparing the results of atomistic molecular dynamics simulations with experimental X-ray scattering and Raman spectroscopy data, we find that the polymer chains are folded in a hairpin manner near each carboxylic acid group, giving rise to multiple embedded layers of functional groups that have an interlayer distance of 2...
March 6, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28262377/factors-controlling-the-rate-of-perfluorooctanoic-acid-degradation-in-laccase-mediator-systems-the-impact-of-metal-ions
#16
Qi Luo, Zunyao Wang, Mingbao Feng, Dora Chiang, David Woodward, Shangtao Liang, Junhe Lu, Qingguo Huang
This study investigated the factors that regulated the degradation of perfluorooctanoic acid (PFOA) in laccase-catalyzed oxidative humification reactions with 1-hydroxybenzotriazole (HBT) as a mediator. The reaction rates were examined under conditions with key factors varied, including initial PFOA concentrations, laccase and HBT dosages, and the ionic contents of the reaction solutions. The PFOA degradation followed pseudo-first order kinetics, and the rate constants (k) were similar for the high (100 μmol L(-1)) and low (1...
March 2, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28252973/dna-with-ionic-atomic-and-clustered-silver-an-xps-study
#17
Ivan L Volkov, Anastasiya Smirnova, Anna A Makarova, Zakhar V Reveguk, Ruslan R Ramazanov, Dmitry Yu Usachov, Vera K Adamchuk, Alexei I Kononov
The rapidly developing field of bionanotechnology requires detailed knowledge of the mechanisms of interaction between inorganic matter and biomolecules. Under conditions different from those in an aqueous solution, however, the chemistry of these systems is elusive and may differ dramatically from their interactions in vitro and in vivo. Here, we report for the first time a photoemission study of a metal silver-DNA interface, formed in vacuo, in comparison with DNA-Ag(+) and fluorescent DNA-Ag complexes formed in solution...
March 13, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28239424/non-covalent-interactions-in-controlling-ph-responsive-behaviors-of-self-assembled-nanosystems
#18
Yang Li, Zhaohui Wang, Qi Wei, Min Luo, Gang Huang, Baran D Sumer, Jinming Gao
Self-assembly and associated dynamic and reversible non-covalent interactions are the basis of protein biochemistry (e.g., protein folding) and development of sophisticated nanomaterial systems that can respond to and amplify biological signals. In this study, we report a systematic investigation of non-covalent interactions that affect the pH responsive behaviors and resulting supramolecular self-assembly of a series of ultra-pH sensitive (UPS) block copolymers. Increase of hydrophobic and π-π stacking interactions led to the decrease of pKa values...
October 14, 2016: Polymer Chemistry
https://www.readbyqxmd.com/read/28237250/a-new-arylesterase-from-pseudomonas-pseudoalcaligenes-can-hydrolyze-ionic-phthalic-polyesters
#19
Karolina Haernvall, Sabine Zitzenbacher, Motonori Yamamoto, Michael Bernhard Schick, Doris Ribitsch, Georg M Guebitz
Extracellular enzymes are assumed to be responsible for the initial and rate limiting step in biodegradation of polymers. Mainly enzymes with aliphatic esters as their natural substrates (e.g. lipase, cutinases) have until now been evaluated for polyester hydrolysis studies. However, the potential of enzymes with aromatic esters as their natural substrates (e.g. arylesterases) have been neglected although many types of polyester today contain aromatic moieties. Consequently, in order to elucidate biodegradation of phthalic polyesters in aquatic systems, a novel arylesterase (PpEst) was investigated related to hydrolysis of ionic phthalic polyesters...
February 22, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/28230533/thermophoretic-transport-of-ionic-liquid-droplets-in-carbon-nanotubes
#20
Rakesh Rajegowda, Sridhar Kumar Kannam, Remco Hartkamp, Sarith P Sathian
Thermal-gradient induced transport of ionic liquid (IL) and water droplets through a carbon nanotube (CNT) is investigated in this study using molecular dynamics simulations. Energetic analysis indicates that IL transport through a CNT is driven primarily by the fluid-solid interaction, while fluid-fluid interactions dominate in water-CNT systems. Droplet diffusion analysis via the moment scaling spectrum reveals sub-diffusive motion of the IL droplet, in contrast to the self-diffusive motion of the water droplet...
April 18, 2017: Nanotechnology
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