keyword
MENU ▼
Read by QxMD icon Read
search

Non-ionic contrast

keyword
https://www.readbyqxmd.com/read/28418670/polarization-effects-on-the-cellulose-dissolution-in-ionic-liquids-molecular-dynamics-simulations-with-polarization-model-and-integrated-tempering-enhanced-sampling-method
#1
Zigui Kan, Qiang Zhu, Lijiang Yang, Zhixiong Huang, Biao-Bing Jin, Jing Ma
Conformation of cellulose with various degree of polymerization of n = 1~12 in ionic liquid 1,3-dimethylimidazolium chloride ([C1mim]Cl) and the intermolecular interaction between them were studied by means of molecular dynamics (MD) simulations with fixed-charge and charge variable polarizable force fields, respectively. The integrated tempering enhanced sampling method was also employed in the simulations in order to improve the sampling efficiency. Cellulose undergoes significant conformational changes from a gaseous right-hand helical twist along the long axis to a flexible conformation in ionic liquid...
April 18, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28402305/the-binding-of-metal-ions-to-molecularly-imprinted-polymers
#2
Rukshan Perera, Syed Ashraf, Anja Mueller
Imprinting polymerization is a flexible method to make resins specific for different compounds. Imprinting polymerization involves the polymerization of the resin in the presence of a template, here cadmium ions or arsenate. The template is then removed by washing, leaving specific binding sites in the resin. In water treatment, the removal of toxic metal ions is difficult due to the limited affinity of these ions to ion exchange resins. Imprinting polymerization of ion-exchange resins is used to develop resins with high capacity and some selectivity for cadmium ions or arsenate for water treatment that still function as general ion-exchange resins...
April 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28384246/proton-and-non-proton-activation-of-asic-channels
#3
Ivan Gautschi, Miguel Xavier van Bemmelen, Laurent Schild
The Acid-Sensing Ion Channels (ASIC) exhibit a fast desensitizing current when activated by pH values below 7.0. By contrast, non-proton ligands are able to trigger sustained ASIC currents at physiological pHs. To analyze the functional basis of the ASIC desensitizing and sustained currents, we have used ASIC1a and ASIC2a mutants with a cysteine in the pore vestibule for covalent binding of different sulfhydryl reagents. We found that ASIC1a and ASIC2a exhibit two distinct currents, a proton-induced desensitizing current and a sustained current triggered by sulfhydryl reagents...
2017: PloS One
https://www.readbyqxmd.com/read/28367595/ionic-currents-influencing-spontaneous-firing-and-pacemaker-frequency-in-dopamine-neurons-of-the-ventrolateral-periaqueductal-gray-and-dorsal-raphe-nucleus-vlpag-drn-a-voltage-clamp-and-computational-modelling-study
#4
Antonios G Dougalis, Gillian A C Matthews, Birgit Liss, Mark A Ungless
Dopamine (DA) neurons of the ventrolateral periaqueductal gray (vlPAG) and dorsal raphe nucleus (DRN) fire spontaneous action potentials (APs) at slow, regular patterns in vitro but a detailed account of their intrinsic membrane properties responsible for spontaneous firing is currently lacking. To resolve this, we performed a voltage-clamp electrophysiological study in brain slices to describe their major ionic currents and then constructed a computer model and used simulations to understand the mechanisms behind autorhythmicity in silico...
April 3, 2017: Journal of Computational Neuroscience
https://www.readbyqxmd.com/read/28353420/antibody-adsorption-on-the-surface-of-water-studied-by-neutron-reflection
#5
Charles Smith, Zongyi Li, Robert Holman, Fang Pan, Richard A Campbell, Mario Campana, Peixun Li, John R P Webster, Steven Bishop, Rojaramani Narwal, Shahid Uddin, Christopher F van der Walle, Jian R Lu
Surface and interfacial adsorption of antibody molecules could cause structural unfolding and desorbed molecules could trigger solution aggregation, resulting in the compromise of physical stability. Although antibody adsorption is important and its relevance to many mechanistic processes has been proposed, few techniques can offer direct structural information about antibody adsorption under different conditions. The main aim of this study was to demonstrate the power of neutron reflection to unravel the amount and structural conformation of the adsorbed antibody layers at the air/water interface with and without surfactant, using a monoclonal antibody 'COE-3' as the model...
April 2017: MAbs
https://www.readbyqxmd.com/read/28352865/effects-of-synthetic-iron-and-aluminium-oxide-surface-charge-and-hydrophobicity-on-the-formation-of-bacterial-biofilm
#6
Hamid M Pouran, Steve A Banwart, Maria Romero-Gonzalez
In this research, bacterial cell attachments to hematite, goethite and aluminium hydroxide were investigated. The aim was to study the effects of these minerals' hydrophobicity and pH-dependent surface charge on the extent of biofilm formation using six genetically diverse bacterial strains: Rhodococcus spp. (RC92 & RC291), Pseudomonas spp. (Pse1 & Pse2) and Sphingomonas spp. (Sph1 & Sph2), which had been previously isolated from contaminated environments. The surfaces were prepared in a way that was compatible with the naturally occurring coating process in aquifers: deposition of colloidal particles from the aqueous phase...
April 19, 2017: Environmental Science. Processes & Impacts
https://www.readbyqxmd.com/read/28306544/acute-ischemic-stroke-mimicking-subarachnoid-hemorrhage-after-coronary-angioplasty
#7
Ana Piršić, 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/28287571/merging-ion-concentration-polarization-between-juxtaposed-ion-exchange-membranes-to-block-the-propagation-of-the-polarization-zone
#8
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/28267511/enhancing-cellulose-dissolution-in-ionic-liquid-by-solid-acid-addition
#9
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/28239424/non-covalent-interactions-in-controlling-ph-responsive-behaviors-of-self-assembled-nanosystems
#10
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/28205399/synthesis-characterization-and-relaxation-studies-of-gd-do3a-conjugate-of-chlorambucil-as-a-potential-theranostic-agent
#11
Jasleen Kaur, Yoanna Tsvetkova, Karim Arroub, Sabri Sahnoun, Fabian Kiessling, Sanjay Mathur
DO3A-based macrocycles serve as attractive templates from which clinically useful theranostic agents can be obtained after coupling with molecular targeted therapeutic drugs. In this study, we describe the chemical synthesis, relaxation, and cytotoxicity studies of a new DO3A conjugate of chlorambucil (CHL) as a magnetic resonance imaging (MRI) theranostic agent. A convenient route of synthesis is reported, which allowed conjugation of the macrocyclic ligand (DO3A) to the chemotherapeutic drug (CHL) via tyrosine for the preparation of an attractive chelate-drug ensemble (DO3A-TR-CHL)...
February 2017: Chemical Biology & Drug Design
https://www.readbyqxmd.com/read/28192954/small-emitter-tips-for-native-mass-spectrometry-of-proteins-and-protein-complexes-from-nonvolatile-buffers-that-mimic-the-intracellular-environment
#12
Anna C Susa, Zijie Xia, Evan R Williams
Salts are often necessary to maintain the native structures and functions of many proteins and protein complexes, but many buffers adversely affect protein analysis by native mass spectrometry (MS). Here, protein and protein complex ions are formed directly from a 150 mM KCl and 25 mM Tris-HCl buffer at pH 7 that is widely used in protein chemistry to mimic the intracellular environment. The protein charge-state distributions are not resolved from electrospray ionization MS using 1.6 μm diameter emitter tips, resulting in no mass information...
February 22, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28078511/intra-individual-comparison-of-different-gadolinium-based-contrast-agents-in-the-quantitative-evaluation-of-c6-glioma-with-dynamic-contrast-enhanced-magnetic-resonance-imaging
#13
Ying Li, Gang Liu, Xin Lou, Zhiye Chen, Lin Ma
This experiment aimed to compare the ionic (Gadodiamide, Gd-DTPA-BMA) and non-ionic (Gadopentetate dimeglumine, Gd-DTPA) gadolinium-based contrast agents (GBCA) in the quantitative evaluation of C6 glioma with dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI). A C6 glioma model was established in 12 Wistar rats, and magnetic resonance (MR) scans were performed six days after tumor implantation. Imaging was performed using a 3.0-T MR scanner with a 7-inch handmade circular coil. Pre-contrast T1 mapping and dynamic contrast-enhanced T1WI after a bolus injection (0...
January 2017: Science China. Life Sciences
https://www.readbyqxmd.com/read/28060917/a-novel-mouse-segmentation-method-based-on-dynamic-contrast-enhanced-micro-ct-images
#14
Dongmei Yan, Zhihong Zhang, Qingming Luo, Xiaoquan Yang
With the development of hybrid imaging scanners, micro-CT is widely used in locating abnormalities, studying drug metabolism, and providing structural priors to aid image reconstruction in functional imaging. Due to the low contrast of soft tissues, segmentation of soft tissue organs from mouse micro-CT images is a challenging problem. In this paper, we propose a mouse segmentation scheme based on dynamic contrast enhanced micro-CT images. With a homemade fast scanning micro-CT scanner, dynamic contrast enhanced images were acquired before and after injection of non-ionic iodinated contrast agents (iohexol)...
2017: PloS One
https://www.readbyqxmd.com/read/28044314/allelic-variations-and-differential-expressions-detected-at-qtl-loci-for-salt-stress-tolerance-in-wheat
#15
Benedict C Oyiga, Ram C Sharma, Michael Baum, Francis C Ogbonnaya, Jens Léon, Agim Ballvora
The increasing salinization of agricultural lands is a threat to global wheat production. Understanding of the mechanistic basis of salt tolerance (ST) is essential for developing breeding and selection strategies that would allow for increased wheat production under saline conditions to meet the increasing global demand. We used a set of 150 diversity panel genotyped with 90 K SNP Chip and phenotyped for ST across three growth stages and for ionic (leaf K(+) and Na(+) contents) traits to dissect the genetic architecture regulating ST in wheat...
January 3, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/27920774/effects-of-tween-80-on-growth-and-biofilm-formation-in-laboratory-media
#16
Christina K Nielsen, Jørgen Kjems, Tina Mygind, Torben Snabe, Rikke L Meyer
Tween 80 is a widely used non-ionic emulsifier that is added to cosmetics, pharmaceuticals, and foods. Because of its widespread use we need to understand how it affects bacteria on our skin, in our gut, and in food products. The aim of this study is to investigate how Tween 80 affects the growth and antimicrobial susceptibility of Staphylococcus aureus, Listeria monocytogenes, and Pseudomonas fluorescens, which are common causes of spoilage and foodborne illnesses. Addition of 0.1% Tween 80 to laboratory growth media increased the growth rate of planktonic S...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27913957/chemical-characterization-of-rainwater-at-a-high-altitude-site-nainital-in-the-central-himalayas-india
#17
Deewan Singh Bisht, A K Srivastava, H Joshi, K Ram, N Singh, M Naja, M K Srivastava, S Tiwari
The present study investigates the chemical composition of rainwater (RW) from a high-altitude site "Nainital" (1958 m above msl) in the central Himalaya region, to understand the influence of local, regional, and long-range transport of pollutants. A total of 55 (2 in pre-monsoon and 53 in monsoon) RW samples were collected during the study period (June-September 2012) and were analyzed for major anions and cations using an ion chromatograph. The pH of precipitation events ranged from 4.95 to 6.50 (average 5...
February 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/27878040/effect-of-contrast-media-on-urinary-cytopathology-specimens
#18
Sebastian Frees, Samir Bidnur, Michael Metcalfe, Peter Raven, Claudia Chavez-Munoz, Igor Moskalev, Ladan Fazli, Alan So
INTRODUCTION: Urological dogma dictates that washings collected from the urinary tract for cytological assessment must be performed without interference from contrast agents that may alter cellular integrity and diagnostic interpretation. In practice, the initial contrast used to outline the upper tracts is commonly discarded with subsequent saline washings sent for cytology. We hypothesize that contrast washings do not affect the morphology of urothelial carcinoma cells or the integrity of cytology interpretation...
August 2016: Canadian Urological Association Journal, Journal de L'Association des Urologues du Canada
https://www.readbyqxmd.com/read/27877155/weak-and-saturable-protein-surfactant-interactions-in-the-denaturation-of-apo-%C3%AE-lactalbumin-by-acidic-and-lactonic-sophorolipid
#19
Kell K Andersen, Brian S Vad, Sophie Roelants, Inge N A van Bogaert, Daniel E Otzen
Biosurfactants are of growing interest as sustainable alternatives to fossil-fuel-derived chemical surfactants, particularly for the detergent industry. To realize this potential, it is necessary to understand how they affect proteins which they may encounter in their applications. However, knowledge of such interactions is limited. Here, we present a study of the interactions between the model protein apo-α-lactalbumin (apo-aLA) and the biosurfactant sophorolipid (SL) produced by the yeast Starmerella bombicola...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27869282/adsorption-and-desorption-behavior-of-ionic-and-nonionic-surfactants-on-polymer-surfaces
#20
Giulia Magi Meconi, Nicholas Ballard, José M Asua, Ronen Zangi
We report combined experimental and computational studies aiming to elucidate the adsorption properties of ionic and nonionic surfactants on hydrophobic polymer surface such as poly(styrene). To represent these two types of surfactants, we choose sodium dodecyl sulfate and poly(ethylene glycol)-poly(ethylene) block copolymers, both commonly utilized in emulsion polymerization. By applying quartz crystal microbalance with dissipation monitoring we find that the non-ionic surfactants are desorbed from the poly(styrene) surface slower, and at low surfactant concentrations they adsorb with stronger energy, than the ionic surfactant...
December 6, 2016: Soft Matter
keyword
keyword
94718
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"