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Scanning electron microscopy of hydroxylated polyvinyl acetal and conventional gauze strip nasal packing materials.

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The application of nasal packing is one of the most commonly performed procedures in rhinology. Various materials have been used as nasal packing, including conventional gauze strips and hydroxylated polyvinyl acetal. Complications related to nasal packing may cause problems that lead to increased

Impact of composite scaffold degradation rate on neural stem cell persistence in the glioblastoma surgical resection cavity.

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Tumoricidal neural stem cells (NSCs) are an emerging therapy to combat glioblastoma (GBM). This therapy employs genetically engineered NSCs that secrete tumoricidal agents to seek out and kill tumor foci remaining after GBM surgical resection. Biomaterial scaffolds have previously been utilized to

Influence of surface properties of Merocel® (polyvinyl acetal) and silicone nasal splints on biofilm formation.

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The objective of the study was to investigate biofilm formation on Merocel(®) and silicone nasal splint after nasal septal surgery. 50 patients who were scheduled to undergo nasal septal surgery were included in this study. The patients were randomized into receiving an insert of Merocel(®) or

Macrotricycles featuring a pi-basic tetrahedral cavity: preference for NH4+ detected by electrospray ionization mass spectrometry.

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Cation-pi interactions play an important role in biology. The title compounds are C3-symmetric macrotricycles built from resorcinol, a pi electron-rich arene. They were prepared in up to 18% yield by intramolecular cyclization of 1,3,5-trisubstituted benzene tripods bearing pendant resorcinol

[The effect of new generation materials used in reconstructive dentistry on the oral cavity environment].

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OBJECTIVE Loss of teeth impairs the functioning of the stomatognathic system, complicates chewing, interferes with speech, and alters the patient's appearance. Reconstruction of the defects with implants or fixed dentures often proves impossible and removable dentures remain the sole option in such

Synthesis and Study of Gas Transport Properties of Polymers Based on Macroinitiators and 2,4-Toluene Diisocyanate.

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Nowadays, block copolymers hold great promise for the design of novel membranes to be applied for the membrane gas separation. In this regard, microporous block copolymers based on a macroinitiator with an anionic nature, such as potassium-substituted block copolymers of propylene oxide and ethylene

Immunochemical studies on human monoclonal macroglobulins with specificities for 3,4-pyruvylated D-galactose and 4,6-pyruvylated D-glucose.

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Four of six human monoclonal IgM proteins were found to react best with Klebsiella polysaccharides containing 3,4py beta DGal (pyruvic acetalated D-galactopyranose), one with Klebsiella polysaccharides with 4,6pyDGlc; the sixth is uncharacterized. The combining sites of two of these (IgMWEA and

[Preparation and clinical application of polyvinyl alcohol/drug-loaded chitosan microsphere composite wound dressing].

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In order to prepare and apply the polyvinyl alcohol/drug-loaded chitosan microspheres composite wound dressing, we first prepared chitosan microspheres by emulsion cross-linking method, and then added chitosan microspheres into the reactants during the acetalization of polyvinyl alcohol and

Effects of glucocorticoid on the expression and regulation of aquaporin 5 in the paranasal sinus of rats with chronic rhinosinusitis.

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Aquaporins (AQPs) are water-specific membrane channel proteins that regulate water homeostasis for cells and organisms. AQP5 serves an important role in the maintenance of mucosal water homeostasis, and potentially contributes to mucosal edema and inflammation formation in chronic rhinosinusitis

Effect of aerosolized fibrin sealant on hemostasis and wound healing after endoscopic sinus surgery: a prospective randomized study.

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BACKGROUND The purpose of this study was to investigate the effect of aerosolized fibrin sealant (FS) compared with that of polyvinyl acetal sponge packing on hemostasis and wound healing after functional endoscopic sinus surgery (FESS). METHODS We conducted a prospective randomized controlled trial

Expandacell, a new sponge for endoscopic sinus surgery.

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Hydroxylated polyvinyl acetal (PVAc) sponges are routinely used for control of bleeding following endoscopic sinus surgery. The physical characteristics of the Meroce sponges and the new Expandacell sponges were evaluated, including pore diameter, sponge size and rate of expansion. The Expandacell

An electrochemical cell coupled with disposable screen-printed electrodes for use in flow injection analysis.

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An electrochemical cell coupled with disposable screen-printed electrodes (SPEs) that is specifically designed for use in flow injection analysis (FIA) is described in this study. The cell is made of foldable polyoxymethylene (acetal) thick platelets with the bottom portion consisting of a cavity

Effect of pendant group on pDNA delivery by cationic-β-cyclodextrin:alkyl-PVA-PEG pendant polymer complexes.

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We have previously shown that cationic-β-cyclodextrin:R-poly(vinyl alcohol)-poly(ethylene glycol) (CD+:R-PVA-PEG) pendant polymer host:guest complexes are safe and efficient vehicles for nucleic acid delivery, where R = benzylidene-linked adamantyl or cholesteryl esters. Herein, we report the

Proton-mediated chemistry and catalysis in a self-assembled supramolecular host.

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Synthetic supramolecular host assemblies can impart unique reactivity to encapsulated guest molecules. Synthetic host molecules have been developed to carry out complex reactions within their cavities, despite the fact that they lack the type of specifically tailored functional groups normally

Fabrication of Ruthenium Nanoparticles in Porous Organic Polymers: Towards Advanced Heterogeneous Catalytic Nanoreactors.

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A novel strategy has been adopted for the construction of a copolymer of benzene-benzylamine-1 (BBA-1), which is a porous organic polymer (POP) with a high BET surface area, through Friedel-Crafts alkylation of benzylamine and benzene by using formaldehyde dimethyl acetal as a cross-linker and

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