keyword
MENU ▼
Read by QxMD icon Read
search

SURFACTANT

keyword
https://www.readbyqxmd.com/read/27933737/testing-the-influence-of-surfactant-based-wound-dressings-on-proteinase-activity
#1
Sunyoung Jeong, Gregory S Schultz, Daniel J Gibson
Proteinases are enzymes that can digest other proteins. In chronic wounds, a sub-class of these enzymes with the ability to degrade the extracellular matrix (matrix metalloproteinases, MMPs) have been found to both inhibit healing and to be able to aid in enzymatically debriding a wound. Enzymatic debridement using the enzymes present in a wound is generally called autolytic debridement. Clinicians seeking to employ autolytic debridement typically use occlusive materials such as medical honey, alginate dressings and other occlusive dressings...
December 8, 2016: International Wound Journal
https://www.readbyqxmd.com/read/27933233/isolation-and-characterisation-of-crude-oil-sludge-degrading-bacteria
#2
Linda U Obi, Harrison I Atagana, Rasheed A Adeleke
BACKGROUND: The use of microorganisms in remediating environmental contaminants such as crude oil sludge has become a promising technique owing to its economy and the fact it is environmentally friendly. Polycyclic aromatic hydrocarbons (PAHs), as the major components of oil sludge, are hydrophobic and recalcitrant. An important way of enhancing the rate of PAH desorption is to compost crude oil sludge by incorporating commercial surfactants, thereby making them available for microbial degradation...
2016: SpringerPlus
https://www.readbyqxmd.com/read/27931388/effects-of-pollution-on-freshwater-organisms
#3
B S Choudri, Mahad Baawain
This review includes works published in the general scientific literature during 2015 on the effects of anthropogenic pollutants on freshwater organisms. It begins with two broad sections: research reviews and broad field studies and surveys. This is followed by reviews of research categorized in sections to reflect the pollutant class. These sections include wastewater, stormwater and non-point source pollution, nutrients, sediment cap materials and suspended clays, botanical extracts, surfactants, metals, persistent organic pollutants, pharmaceuticals, endocrine disruptors, pesticides, petroleum hydrocarbons and polycyclic aromatic hydrocarbons (PAHs), ionic liquids, and nanomaterials...
October 2016: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/27930851/surfactant-free-fabrication-of-fullerene-c60-nanotubules-under-shear
#4
Kasturi Vimalanathan, Rekha Goswami Shrestha, Zhi Zhang, Jin Zou, Tomonobu Nakayama, Colin L Raston
A method for controlling the self-assembly of fullerene C60 molecules into nanotubules in the fcc phase, devoid of entrapped solvent, has been established in a thin film microfluidic device. The micron length C60 nanotubules, with individual hollow diameters of 100 to 400 nm, are formed under continuous flow processing during high shear micromixing of water and a toluene solution of the fullerene, in the absence of surfactant, and without the need for further down-stream processing. TEM revealed pores on the surface of the nanotubes, and the isolated material has a much higher response to small molecule sensing than that for analogous material formed using multistep batch processing...
December 8, 2016: Angewandte Chemie
https://www.readbyqxmd.com/read/27929164/the-role-of-the-binding-salt-sodium-salicylate-in-semidilute-ionic-cetylpyridinium-chloride-micellar-solutions-a-rheological-and-scattering-study
#5
D Gaudino, R Pasquino, J Stellbrink, N Szekely, M Krutyeva, A Radulescu, W Pyckhout-Hintzen, N Grizzuti
The micellar system based on cetylpyridinium chloride (CPyCl) and sodium salicylate (NaSal) in brine solution is investigated on both macro- and micro-length scales through rheology and scattering measurements. The linear viscoelasticity of the system and its structural parameters are explored by systematically changing the amount of NaSal over an extremely wide range of concentrations, thus producing salt-to-surfactant molar ratios from zero to about 8.5. As a result, the well-known non-monotonic behaviour of the zero-shear rate viscosity as a function of salinity can be connected to micellar morphological changes, whose driving force is represented by the simultaneous binding and screening actions of NaSal...
December 8, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27928613/evaluation-of-the-antibacterial-activity-of-a-cationic-polymer-in-aqueous-solution-with-a-convenient-electrochemical-method
#6
Yihong Wang, Qing Guo, Huafu Wang, Kun Qian, Liang Tian, Chen Yao, Wei Song, Weixia Shu, Ping Chen, Jinxu Qi
Quaternized chitosan is a cationic biopolymer with good antibacterial activity, biocompatibility, and biodegradability, and it has been widely applied in many fields. We have developed a convenient method to evaluate the antibacterial activity of hydroxypropyltrimethylammonium chloride chitosan (HACC) with a nonionic surfactant poloxamer in aqueous solution by monitoring the change of the oxidation peak current in cyclic voltammetry. Increasing values of the oxidation peak current were positively correlated with the antibacterial activity of HACC-poloxamer solutions...
December 7, 2016: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/27927981/xylem-surfactants-introduce-a-new-element-to-the-cohesion-tension-theory
#7
H Jochen Schenk, Susana Espino, David M Romo, Neda Nima, Aissa Y T Do, Joseph M Michaud, Brigitte Papahadjopoulos-Sternberg, Jinlong Yang, Yi Y Zuo, Kathy Steppe, Steven Jansen
Vascular plants transport water under negative pressure without constantly creating gas bubbles that would disable their hydraulic systems. Attempts to replicate this feat in artificial systems almost invariably result in bubble formation, except under highly controlled conditions with pure water and only hydrophilic surfaces present. In theory, conditions in the xylem should favor bubble nucleation even more: There are millions of conduits with at least some hydrophobic surfaces; xylem sap is saturated or sometimes supersaturated with atmospheric gas, and may contain surface active molecules that can lower surface tension...
December 7, 2016: Plant Physiology
https://www.readbyqxmd.com/read/27924944/platform-construction-and-extraction-mechanism-study-of-magnetic-mixed-hemimicelles-solid-phase-extraction
#8
Deli Xiao, Chan Zhang, Jia He, Rong Zeng, Rong Chen, Hua He
Simple, accurate and high-throughput pretreatment method would facilitate large-scale studies of trace analysis in complex samples. Magnetic mixed hemimicelles solid-phase extraction has the power to become a key pretreatment method in biological, environmental and clinical research. However, lacking of experimental predictability and unsharpness of extraction mechanism limit the development of this promising method. Herein, this work tries to establish theoretical-based experimental designs for extraction of trace analytes from complex samples using magnetic mixed hemimicelles solid-phase extraction...
December 7, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27924521/effects-of-different-surfactant-administrations-on-cerebral-autoregulation-in-preterm-infants-with-respiratory-distress-syndrome
#9
Xu-Fang Li, Ting-Ting Cheng, Rui-Lian Guan, Hong Liang, Wei-Neng Lu, Jing-Hua Zhang, Mei-Yi Liu, Xin Yu, Jun Liang, Li Sun, Lian Zhang
To treat respiratory distress syndrome, surfactant is currently delivered via less invasive surfactant administration (LISA) or INtubation SURfactant Extubation (INSURE). The aim of this study was to compare the effect of the two delivery methods of surfactant on cerebral autoregulation. Near infrared spectroscopy monitoring was carried out to detect cerebral oxygen saturation (ScO2), and the mean arterial blood pressure (MABP) was simultaneously recorded. Of 44 preterm infants included, the surfactant was administrated to 22 via LISA and 22 via INSURE...
December 2016: Journal of Huazhong University of Science and Technology. Medical Sciences
https://www.readbyqxmd.com/read/27924310/tunable-oleo-furan-surfactants-by-acylation-of-renewable-furans
#10
Dae Sung Park, Kristeen E Joseph, Maura Koehle, Christoph Krumm, Limin Ren, Jonathan N Damen, Meera H Shete, Han Seung Lee, Xiaobing Zuo, Byeongdu Lee, Wei Fan, Dionisios G Vlachos, Raul F Lobo, Michael Tsapatsis, Paul J Dauenhauer
An important advance in fluid surface control was the amphiphilic surfactant composed of coupled molecular structures (i.e., hydrophilic and hydrophobic) to reduce surface tension between two distinct fluid phases. However, implementation of simple surfactants has been hindered by the broad range of applications in water containing alkaline earth metals (i.e., hard water), which disrupt surfactant function and require extensive use of undesirable and expensive chelating additives. Here we show that sugar-derived furans can be linked with triglyceride-derived fatty acid chains via Friedel-Crafts acylation within single layer (SPP) zeolite catalysts...
November 23, 2016: ACS Central Science
https://www.readbyqxmd.com/read/27923698/engineered-sodium-hyaluronate-respirable-dry-powders-for-pulmonary-drug-delivery
#11
Francesco Martinelli, Anna Giulia Balducci, Abhinav Kumar, Fabio Sonvico, Ben Forbes, Ruggero Bettini, Francesca Buttini
Sodium hyaluronate (HYA) warrants attention as a material for inhalation due to its (i) therapeutic potential, (ii) utility as a formulation excipient or drug carrier, and (iii) ability to target lung inflammation and cancer. This study aimed to overcome formulation and manufacturing impediments to engineer biocompatible spray-dried HYA powders for inhalation. Novel methodology was developed to produce HYA microparticles by spray drying. Different types of surfactant were included in the formulation to improve powder respirability, which was evaluated in vitro using cascade impactors...
December 3, 2016: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/27922645/graphene-as-a-photothermal-actuator-for-control-of-lipid-mesophase-structure
#12
Matthew D J Quinn, Tao Wang, Joanne D Du, Ben J Boyd, Adrian Hawley, Shannon M Notley
The optical density of pristine graphene is high and broad in the near infrared region of the electromagnetic spectrum positioning this material as a highly efficient photothermal agent for in vivo applications. In this study, surfactant assisted exfoliated graphene was incorporated within bulk lipid samples of varying lipid types: glyceryl monoether, glyceryl monooleate and phytantriol. The pristine graphene sheets did not disrupt the packing of the liquid crystals while being in sufficiently intimate contact to provide localized heating and induce phase transitions...
December 6, 2016: Nanoscale
https://www.readbyqxmd.com/read/27922250/an-unusual-complication-of-endotracheal-intubation-ingestion-of-a-bulb-in-a-premature-neonate
#13
Özmert M A Özdemir, Ali Koçyiğit, Cem Çiçek, Uğur Koltuksuz, Hacer Ergin
Endotracheal intubation is a common daily procedure used for sustaining life in premature and term neonates in the neonatal intensive care unit. This procedure can be associated with some iatrogenic complications. One of these complications is ingesting a laryngoscope light bulb, and it is an extremely rare complication in neonates. The consequences of ingestion or aspiration may be serious and life-threatening. Herein, a male premature neonate, ingested a laryngoscope light bulb during endotracheal intubation because of surfactant replacement therapy, is reported...
2016: Turkish Journal of Pediatrics
https://www.readbyqxmd.com/read/27921310/chiral-selectors-in-ce-recent-development-and-applications-mid-2014-mid-2016
#14
REVIEW
Ioannis J Stavrou, Eliana A Agathokleous, Constantina P Kapnissi-Christodoulou
This report, which is a sequence of a series of reviews, records the most important chiral selectors (CSs) applied in CE. It highlights the CSs that were used during the period 2014 to mid 2016. In this review, method developments, validations, and pharmaceutical along with biomedical applications are presented. The different CSs include cyclodextrins, antibiotics, cyclofructants, linear and branched oligo- and polysaccharides and polymeric surfactants. In addition, the advantages of these CSs, along with their chiral recognition mechanisms, and their performance, are discussed...
December 6, 2016: Electrophoresis
https://www.readbyqxmd.com/read/27921279/biocompatibility-of-fluids-for-multiphase-drops-in-drops-microfluidics
#15
Aishah Prastowo, Alexander Feuerborn, Peter R Cook, Edmond J Walsh
This paper addresses the biocompatibility of fluids and surfactants in the context of microfluidics and more specifically in a drops-in-drops system for mammalian cell based drug screening. In the drops-in-drops approach, three immiscible fluids are used to manipulate the flow of aqueous microliter-sized drops; it enables merging of drops containing cells with drops containing drugs within a Teflon tube. Preliminary tests showed that a commonly-used fluid and surfactant combination resulted in significant variability in gene expression levels in Jurkat cells after exposure to a drug for four hours...
December 2016: Biomedical Microdevices
https://www.readbyqxmd.com/read/27921245/a-novel-method-for-preventing-surface-film-entrapment-of-water-fleas-and-its-application-for-toxicity-testing-with-heavy-metals
#16
Rongxue Cui, Jin Il Kwak, Youn-Joo An
Some water fleas such as Daphnia galeata and Bosmina longirostris are difficult to culture and use in ecotoxicity testing since they can easily become entrapped at the surface film. Cetyl alcohol was the most prevalent chemical used to prevent the entrapment of water fleas in previous studies. However, cetyl alcohol possesses a number of disadvantages including its toxicity and water insolubility. This study presents a novel method for preventing surface film entrapment of the water flea D. galeata and B. longirostris acute testing...
December 5, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/27921099/thermoresponsive-microgels-containing-trehalose-as-soft-matrices-for-3d-cell-culture
#17
Małgorzata Burek, Sylwia Waśkiewicz, Anna Lalik, Sebastian Student, Tadeusz Bieg, Ilona Wandzik
A series of thermoresponsive glycomicrogels with trehalose in the cross-links or with trehalose in the cross-links and as pending moieties was synthesized. These materials were obtained by surfactant-free precipitation copolymerization of N-isopropylacrylamide and various amounts of trehalose monomers. The resultant particles showed a spherical shape and a submicrometer hydrodynamic size with a narrow size distribution. At 25 °C, glycomicrogels in solutions with physiological ionic strength formed stable colloids, which further gelled upon heating to physiological temperature forming a macroscopic hydrogel with an interconnected porous structure...
December 6, 2016: Biomaterials Science
https://www.readbyqxmd.com/read/27919118/preeclampsia-and-the-risk-of-bronchopulmonary-dysplasia-in-preterm-infants-less-than-32-weeks-gestation
#18
Nancy Soliman, Kathleen Chaput, Belal Alshaikh, Kamran Yusuf
Objective Angiogenesis is essential for normal lung development. The objective of our study was to test the hypothesis that preeclampsia, an antiangiogenic state, is a risk factor for bronchopulmonary dysplasia (BPD). Design Prospective cohort study of infants less than 32 weeks' gestation born to mothers with preeclampsia between January 2007 and June 2010 at a single tertiary care center. Their BPD outcome was compared with infants born to the next two normotensive mothers with a ± 1 week gestational age difference...
December 5, 2016: American Journal of Perinatology
https://www.readbyqxmd.com/read/27918987/surfactant-assisted-selective-etching-strategy-for-generation-of-rattle-like-mesoporous-silica-nanoparticles
#19
Xingwen Liu, Zheng Jiao, Tingting Song, Minghong Wu, Haijiao Zhang
Nowadays, rattle-like or so-called yolk-shell nanostructures have set off a new wave of research in view of their prominent features including large surface area, tunable void and flexible functional core, etc. Herein, rattle-like mesoporous silica nanoparticles (RMSNs) with a pure silica core, a hollow cavity and a mesoporous shell have been successfully fabricated via a surfactant-assisted selective etching strategy. The synthetic approach involves the preparation of solid silica spheres with three-layer different structural silica containing the inner core of pure silica, middle layer of hybrid silica and outer shell of surfactant/SiO2 composite, followed by a hydrothermal treatment in hot water...
November 24, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27918966/development-of-novel-cilostazol-loaded-solid-snedds-using-a-spg-membrane-emulsification-technique-physicochemical-characterization-and-in-vivo-evaluation
#20
Omer Mustapha, Kyung Soo Kim, Shumaila Shafique, Dong Shik Kim, Sung Giu Jin, Youn Gee Seo, Yu Seok Youn, Kyung Taek Oh, Beom-Jin Lee, Young Joon Park, Chul Soon Yong, Jong Oh Kim, Han-Gon Choi
The objective of this study was to develop a novel solid self-nanoemulsifying drug delivery system (SNEDDS) using a membrane emulsification technique involving Shirasu porous glass (SPG) which produced very small and uniform emulsion droplets, resulting in enhanced solubility, dissolution and oral bioavailability of poorly water-soluble cilostazol. The effects of carriers on the drug solubility were assessed, and pseudo-ternary phase diagrams were plotted. Among the liquid SNEDDS formulations tested, the liquid SNEDDS composed of peceol (oil), Tween 20 (surfactant) and Labrasol (cosurfactant) at a weight ratio of 15/55/30, produced the smallest emulsion droplet size...
November 29, 2016: Colloids and Surfaces. B, Biointerfaces
keyword
keyword
21397
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"