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https://www.readbyqxmd.com/read/28780853/inhibition-of-biodegradation-of-hydraulic-fracturing-compounds-by-glutaraldehyde-groundwater-column-and-microcosm-experiments
#1
Jessica D Rogers, Imma Ferrer, Shantal S Tummings, Angela Bielefeldt, Joseph N Ryan
The rapid expansion of unconventional oil and gas development has raised concerns about the potential contamination of aquifers; however, the groundwater fate and transport of hydraulic fracturing fluid compounds and mixtures remains a significant data gap. Degradation kinetics of five hydraulic fracturing compounds (2-propanol, ethylene glycol, propargyl alcohol, 2-butoxyethanol, and 2-ethylhexanol) in the absence and presence of the biocide glutaraldehyde were investigated under a range of redox conditions using sediment-groundwater microcosms and flow-through columns...
August 7, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28765670/microleakage-in-class-v-composite-restorations-after-desensitizing-surface-treatment-with-er-yag-and-co2-lasers
#2
Hamid Reza Mozaffari, Alireza Ehteshami, Farshad Zallaghi, Nasim Chiniforush, Zohreh Moradi
Aims: Glutaraldehyde, CO2 and Er:YAG lasers can be used for treatment of dentin hypersensitivity. However, their application may have adverse effects on the clinical service of restorations. This study aimed to assess the microleakage in composite restorations following surface treatment with Glutaraldehyde desensitizer, CO2 and Er:YAG laser irradiation for treatment of dentin hypersensitivity. Materials and methods: This experimental study was conducted on 60 extracted sound human teeth. Class V cavities were prepared measuring 3×3 mm using a diamond bur...
December 30, 2016: Laser Therapy
https://www.readbyqxmd.com/read/28764006/potential-antioxidant-peptides-produced-from-whey-hydrolysis-with-an-immobilized-aspartic-protease-from-salpichroa-origanifolia-fruits
#3
Gabriela Fernanda Rocha, Francisco Kise, Adriana Mabel Rosso, Mónica Graciela Parisi
An aspartic protease from Salpichroa origanifolia fruits was successfully immobilized onto an activated support of glutaraldehyde agarose. The immobilized enzyme presented higher thermal stability than the free enzyme from 40°C to 50°C and high reusability, retaining 54% of the initial activity after ten cycles of the process. Whey protein concentrates (WPC) were hydrolyzed with both free and immobilized enzyme, reaching a similar degree of hydrolysis of approximately 6-8% after 20h. In addition, the immobilized derivate hydrolyzed α-lactalbumin protein with a higher affinity than β-lactoglobulin...
December 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28762007/optimization-of-enzyme-co-immobilization-with-sodium-alginate-and-glutaraldehyde-activated-chitosan-beads
#4
Sinem Diken Gür, Neslihan İdil, Nilüfer Aksöz
In this study, two different materials-alginate and glutaraldehyde-activated chitosan beads-were used for the co-immobilization of α-amylase, protease, and pectinase. Firstly, optimization of multienzyme immobilization with Na alginate beads was carried out. Optimum Na alginate and CaCl2 concentration were found to be 2.5% and 0.1 M, respectively, and optimal enzyme loading ratio was determined as 2:1:0.02 for pectinase, protease, and α-amylase, respectively. Next, the immobilization of multiple enzymes on glutaraldehyde-activated chitosan beads was optimized (3% chitosan concentration, 0...
July 31, 2017: Applied Biochemistry and Biotechnology
https://www.readbyqxmd.com/read/28758327/characterization-of-pva-glutaraldehyde-hydrogels-obtained-using-central-composite-rotatable-design-ccrd
#5
Andreia de Araújo Morandim-Giannetti, Samantha Regina Rubio, Regina Freitas Nogueira, Fernando Dos Santos Ortega, Octaviano Magalhães Junior, Paulo Schor, Patrícia Alessandra Bersanetti
Hydrogels are made from natural or synthetic polymers and, currently, they have many biomedical applications. In this work, the conditions for obtaining a hydrogel with similar physicochemical characteristics to the vitreous humor were defined using polyvinyl alcohol (PVA) and glutaraldehyde (GLUT) as cross-linker. The concentration of PVA and GLUT were modified, and their effect was analyzed in terms of the refractive index, density, and dynamic viscosity. The hydrogel which was obtained using 3.98% (w/V) of PVA, 3...
July 31, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28757423/solid-solid-crosslinking-of-carboxymethyl-cellulose-nanolayer-on-titanium-oxide-nanoparticles-as-a-novel-biocomposite-for-efficient-removal-of-toxic-heavy-metals-from-water
#6
Mohamed E Mahmoud, Azza E H Abdou, Mostafa E Sobhy, Nesma A Fekry
Nano titanium oxide (Nano-TiO2) was used in this work as a solid support to solid-solid immobilize carboxymethyl cellulose via glutaraldehyde as an efficient cross linking reagent to produce a novel nanosized biocomposite (Nano-TiO2-glu-CMC). The synthesized materials were characterized by FT-IR to confirm crosslinking reaction between the two species as well as by HR-TEM, SEM, TGA and surface area analysis. The particle size was found to correspond to 22.2-44.4nm for Nano-TiO2-glu-CMC. The designed nanosized biocomposite was used and compared with Nano-TiO2 for separation and extraction of heavy metal ions such as Cd(II), Pb(II) and Hg(II) from aqueous solution by using batch experiment and microcolumn technique...
July 27, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28732732/porous-chitosan-beads-of-superior-mechanical-properties-for-the-covalent-immobilization-of-enzymes
#7
Marwa I Wahba
Porous chitosan beads of superior mechanical properties were produced via a two stepped treatment process. First, the chitosan ionotropic gelation solution was supplemented with Na2CO3, which acted as a porogen. Afterwards, the beads were chemically cross-linked with glutaraldehyde. This treatment also caused the produced porous chitosan beads to acquire higher observed activities of immobilized β-d-galactosidase (β-gal). The observed activities of the β-gal immobilized onto the 0.2M and the 0.35M Na2CO3 treated beads were 1...
July 18, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28728113/catalase-based-hydrogen-peroxide-biosensor-for-mercury-determination-by-inhibition-measurements
#8
Basant Elsebai, Mariana Emilia Ghica, Mohammed Nooredeen Abbas, Christopher M A Brett
A new amperometric hydrogen peroxide enzyme inhibition biosensor for the indirect determination of toxic mercury ions, Hg(2+), based on catalase immobilized on a glassy carbon electrode surface by cross-linking with glutaraldehyde and bovine serum albumin, is reported. The parameters influencing biosensor performance were optimized, including enzyme loading, the amount of hydrogen peroxide, the applied potential and electrolyte pH. It was shown that the inhibition of catalase by Hg(2+) species is irreversible, with a linear inhibition response between 5×10(-11) and 5×10(-10)M...
July 11, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28690263/direct-electron-transfer-type-bioelectrocatalysis-of-peroxidase-at-mesoporous-carbon-electrodes-and-its-application-for-glucose-determination-based-on-bienzyme-system
#9
Hong-Qi Xia, Yuki Kitazumi, Osamu Shirai, Kenji Kano
Non-catalytic direct electron transfer (DET) signal of Compound I of horseradish peroxidase (POD) was first detected at 0.7 V on POD/carbon nanotube mixture-modified electrodes. Excellent performance of DET-type bioelectrocatalysis was achieved with POD immobilized with glutaraldehyde on Ketjen Black (KB)-modified electrodes for H2O2 reduction with an onset potential of 0.65 V (vs. Ag | AgCl | sat. KCl) without any electrode surface modification. The POD-immobilized KB electrode was found to be suitable for detecting H2O2 with a low detection limit (0...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28686585/constructing-cellular-niche-properties-by-localized-presentation-of-wnt-proteins-on-synthetic-surfaces
#10
Molly Lowndes, Sergi Junyent, Shukry J Habib
Wnt signaling is crucial during embryonic development and for the maintenance of adult tissues. Depending on the tissue type, the Wnt pathway can promote stem cell self-renewal and/or direct lineage commitment. Wnt proteins are subject to lipid modification, often restricting them to act in a localized manner on responsive cells. Most methods for inducing Wnt signaling in stem cell cultures do not control the spatial presentation of the protein. To recreate the local presentation of Wnt proteins often seen in vivo, we previously developed a method to immobilize the protein onto synthetic surfaces...
July 2017: Nature Protocols
https://www.readbyqxmd.com/read/28685126/characterization-of-ferrite-nanoparticles-for-preparation-of-biocomposites
#11
Urszula Klekotka, Magdalena Rogowska, Dariusz Satuła, Beata Kalska-Szostko
Ferrite nanoparticles with nominal composition Me0.5Fe2.5O4 (Me = Co, Fe, Ni or Mn) have been successfully prepared by the wet chemical method. The obtained particles have a mean diameter of 11-16 ± 2 nm and were modified to improve their magnetic properties and chemical activity. The surface of the pristine nanoparticles was functionalized afterwards with -COOH and -NH2 groups to obtain a bioactive layer. To achieve our goal, two different modification approaches were realized. In the first one, glutaraldehyde was attached to the nanoparticles as a linker...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28680549/the-effect-of-prolonged-storage-and-disinfection-on-the-dimensional-stability-of-5-vinyl-polyether-silicone-impression-materials
#12
Usama Nassar, Carlos Flores-Mir, Giseon Heo, Ysidora Torrealba
PURPOSE: Vinyl polyether silicone (VPES) has a different composition from other elastomeric impression materials as it combines vinyl polysiloxane (VPS) and polyether (PE). Therefore, it is important to study its properties and behavior under different test conditions. This study investigated the dimensional stability of 5 VPES consistencies when stored for up to 2 weeks, with and without using a standard disinfection procedure. MATERIALS AND METHODS: 40 discs of each VPES consistency (total 200) were made using a stainless steel die and ring as described by ANSI /ADA specification No...
June 2017: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/28678803/ph-responsive-n-succinyl-chitosan-poly-acrylamide-co-acrylic-acid-hydrogels-and-in-vitro-release-of-5-fluorouracil
#13
Shahid Bashir, Yin Yin Teo, Sumaira Naeem, S Ramesh, K Ramesh
There has been significant progress in the last few decades in addressing the biomedical applications of polymer hydrogels. Particularly, stimuli responsive hydrogels have been inspected as elegant drug delivery systems capable to deliver at the appropriate site of action within the specific time. The present work describes the synthesis of pH responsive semi-interpenetrating network (semi-IPN) hydrogels of N-succinyl-chitosan (NSC) via Schiff base mechanism using glutaraldehyde as a crosslinking agent and Poly (acrylamide-co-acrylic acid)(Poly (AAm-co-AA)) was embedded within the N-succinyl chitosan network...
2017: PloS One
https://www.readbyqxmd.com/read/28662476/effect-of-crosslinking-on-the-physical-and-chemical-properties-of-%C3%AE-lactoglobulin-blg-microgels
#14
Ryan W Murphy, Brian E Farkas, Owen G Jones
HYPOTHESIS: Microgels assembled from the protein β-lactoglobulin are colloidal structures with potential applications in food materials. Modifying the internal crosslinking within these microgels using enzymatic or chemical treatments should affect dissolution, swelling, and viscous attributes under strongly solvating conditions. EXPERIMENTS: Microgels were treated with citric acid, glutaraldehyde and transglutaminase to induce cross-linking or with tris(2-carboxyethyl)phosphine to reduce disulfide linkages...
June 23, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28655955/comparison-of-efficacy-and-cost-effectiveness-of-0-55-ortho-phthalaldehyde-and-2-glutaraldehyde-for-disinfection-of-laryngoscopes-a-prospective-pilot-study
#15
Priyanka Pradeep Karnik, Nandini Malay Dave, Gita Nataraj, Rajarshi Gupta, Madhu Garasia
BACKGROUND AND AIMS: The laryngoscope is a potential source of cross-infection as it involves contact with the mucous membrane, saliva and occasionally blood. This study compared efficacy and cost-effectiveness of two Centre for Disease Control approved agents for disinfection of laryngoscope blades. METHODS: One hundred and sixty patients requiring laryngoscopy and intubation for general anaesthesia were randomly allocated into two groups. After tracheal intubation, used laryngoscope blades were cleaned with tap water...
June 2017: Indian Journal of Anaesthesia
https://www.readbyqxmd.com/read/28649791/bioactivity-and-biomineralization-ability-of-calcium-silicate-based-pulp-capping-materials-after-subcutaneous-implantation
#16
G Hinata, K Yoshiba, L Han, N Edanami, N Yoshiba, T Okiji
AIM: To evaluate the abilities of three calcium silicate-based pulp-capping materials (ProRoot MTA, TheraCal LC, and a prototype tricalcium silicate cement) to produce apatite-like precipitates after being subcutaneously implanted into rats. METHODOLOGY: Polytetrafluoroethylene tubes containing each material were subcutaneously implanted into the backs of Wistar rats. At 7, 14, and 28 days post-implantation, the implants were removed together with the surrounding connective tissue, and fixed in 2...
June 26, 2017: International Endodontic Journal
https://www.readbyqxmd.com/read/28648614/the-effects-of-retinoic-acid-on-mmp-2-production-proliferation-and-ultrastructural-morphology-in-rat-uterus
#17
Tuğba Kotil, Şengül Şentürk, Türkan Sarioğlu, Leyla Tapul
AIMS: Retinoic acid (RA) has a vital importance in order to ensure continuity and morphology in many tissues. Matrix metalloproteinases (MMPs) have significant roles in proliferation, the formation of cancers, and metastasis. In this study the effects of RA on MMP-2 production in cells of rat uterus were investigated. METHODS: Twenty-four adult Spraque Dawley rats were divided into two groups, the experimental group was treated with 40mg/kg/day 13-cis RA for 5days by gavage...
June 22, 2017: Experimental and Toxicologic Pathology: Official Journal of the Gesellschaft Für Toxikologische Pathologie
https://www.readbyqxmd.com/read/28647880/selective-removal-and-preconcentration-of-triclosan-using-a-water-compatible-imprinted-nano-magnetic-chitosan-particles
#18
Yuan Chen, Xin Lei, Rongni Dou, Yuancai Chen, Yongyou Hu, Zhiqi Zhang
A water-compatible magnetic triclosan (TCS) imprinted material (TCS-CTS-Fe(0)-MIPs) was synthesized for selective enrichment and detection of TCS in real complex water samples. The material was synthesized by using chitosan (CTS) as functional monomer, which has rich surface O- and N-containing functional groups. The TCS imprinted CTS was coated on Fe(0) surface and then cross-linked with glutaraldehyde. Scanning electron microscopy suggested that the imprinted material was covered with a layer of imprinted film, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy confirmed that the imprinted material had more functional groups (amino and hydroxyl groups) than that of non-imprinted material...
June 25, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28647524/preparation-and-evaluation-of-bsa-based-hydrosol-nanoparticles-cross-linked-with-genipin-for-oral-administration-of-poorly-water-soluble-curcumin
#19
Narges Shahgholian, Ghadir Rajabzadeh, Bizhan Malaekeh-Nikouei
One of the most interesting functions of albumin is the ability to interact with bioactive compounds. This study describes preparation of protein-based nanoparticles (NPs) for the preparation of solid dispersion of curcumin (CN). Fabrication of hydrosol system of dispersed CN in bovine serum albumin (BSA) was approached, followed by cross-linking with glutaraldehyde (Gta). Response surface methodology (RSM) was used to investigate the influence of input factors (pH, CN content and organic phase ratio (r)), on the particle size and CN entrapment efficiency (EE)...
June 21, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28641394/reoperative-analysis-after-mitral-valve-repair-with-glutaraldehyde-treated-autologous-pericardium
#20
Naoto Fukunaga, Ryuzo Sakata, Tadaaki Koyama
OBJECTIVES: We reviewed reoperations following mitral valve repair (MVR) that used glutaraldehyde-treated autologous pericardium for mitral regurgitation (MR) to analyse the durability and risk factors for reoperation. METHODS: We retrospectively analysed 144 patients (mean age 57.9 years) who underwent MVR using glutaraldehyde-treated pericardium from March 1992 to December 2011. A total of 19 reoperations were necessary during the follow-up period (mean 6.9 years)...
June 21, 2017: Interactive Cardiovascular and Thoracic Surgery
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