ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTAmplified Fluorescence Quenching in a Poly(p-phenylene)-Based Cationic PolyelectrolyteBenjamin S. Harrison, Michael B. Ramey, John R. Reynolds, and Kirk SchanzeView Author Information Department of Chemistry Center for Macromolecular Science Engineering University Florida, Gainesville, Florida 32611-7200 Cite this: J. Am. Chem. Soc. 2000, 122, 35, 8561–8562Publication Date (Web):August 16, 2000Publication History Received7 March 2000Revised21...

A novel preparation method of CdS nanoparticles with controllable size and stability is presented. Poly(styrene-block-2-vinylpyridine) (PS-b-P2VP) cadmium ions form aggregates single micelles called compound micelles, upon addition the acetate salt into a solution block copolymer in tetrahydrofuran. The growth confined to core after introduction hydrogen sulfide gas solution. UV−visible spectroscopy, fluorescence transmission electron microscopy were employed characterize prepared...

Abstract A variety of cell types respond to electrical stimuli; accordingly, many conducting polymers (CPs) have been used as tissue engineering (TE) scaffolds, and one such CP is polypyrrole (PPy). PPy a well‐studied biomaterial with potential TE applications because its conductivity other beneficial properties. Combining characteristics an elastomeric material, polyurethane (PU), may yield hybrid scaffold activity significant mechanical resilience. Pyrrole was in situ polymerized within PU...

It has been established that nerves and skeletal muscles respond communicate via electrical signals. In regenerative medicine, there is current emphasis on using conductive nanomaterials to enhance conduction through tissue-engineered scaffolds increase cell differentiation tissue regeneration. We investigated the role of chemically synthesized polyaniline (PANI) poly(3,4-ethylenedioxythiophene) (PEDOT) polymer nanofibres for gels. To mimic a naturally derived extracellular matrix growth,...

Oxygen generating biomaterials represent a new trend in regenerative medicine that aims to generate and supply oxygen at the site of requirement, support tissue healing regeneration. To enhance dermal wounds, we have developed highly portable, situ wound dressings uses sodium percarbonate (SPO) calcium peroxide (CPO) as chemical sources. The dressing continuously generated for more than 3 days, after which it was replaced. In vivo testing on porcine full-thickness model, SPO/CPO showed...

Provision of supplemental oxygen to maintain soft tissue viability acutely following trauma in which vascularization has been compromised would be beneficial for limb and salvage. For this application, an generating biomaterial that may injected directly into the could provide unprecedented treatment acute setting. The purpose current investigation was determine if sodium percarbonate (SPO), biomaterial, is capable maintaining resting skeletal muscle homeostasis under otherwise hypoxic...

Using a simple non‐conjugated polymer host , blends with tetraphenylporphyrin complexes of ytterbium [Yb(TPP)L] have been used to construct near‐infrared‐emitting diodes in which the Yb(TPP)L serves as both emitter and charge‐transport medium. The Figure shows structure Ln(TPP)L(OEt), simplified mechanism light‐emitting diode operation.

Near-infrared-emitting polymer light-emitting diodes (PLEDs) have been fabricated using blends of conjugated polymers and lanthanide tetraphenylporphyrin complexes. Host include MEH–PPV a bis-alkoxy-substituted poly(p-phenylene) (PPP–OR11), the complexes Yb(TPP)acac Er(TPP)acac (where TPP=5,10,15,20-tetraphenylporphyrin acac=acetylacetonate). Electroluminescence (EL) is observed at 977 nm from devices or PPP–OR11 blended with Yb(TPP)acac, EL 1560 device blend Er(TPP)acac. Visible host...

Abstract Near‐infrared‐emitting electroluminescent (EL) devices using blue‐light‐emitting polymers blended with the Yb complexes Yb(DBM) 3 phen (DBM = dibenzoylmethane), Yb(DNM) (DNM dinaphthoylmethane), and Yb(TPP)L(OEt) (L(OEt) [(C 5 H )Co{P(O)Et 2 } ] – ) have been studied. EL composed of PPP‐OR11 showed enhanced near‐IR output at 977 nm when compared to those fabricated phen/PPP‐OR11 blends. The maximum external efficiencies are, respectively, 7 × 10 –5 (at 6 V 0.81 mA mm –2 4 –4 V, 0.74...

The synthesis, characterization, and single crystal X-ray diffraction structures of a series monoporphyrinate, trivalent lanthanide complexes with the monoanionic ligands hydridotris(1-pyrazolyl)borate (Tp) (cyclopentadienyl)tris(diethylphosphinito)cobaltate (L(OEt)) having general formulas M(TPP)(L) (M = Yb, Tm, Er, Ho, Nd, Pr; TPP 5,10,15,20-tetraphenylporphyrinate; L Tp, L(OEt)) are described. photophysical properties these also presented including their absorption, emission, transient...

Background: This study examined the effects of electrically conductive materials made from electrospun single- or multiwalled carbon nanotubes with polyurethane to promote myoblast differentiation into myotubes in presence and absence electrical stimulation. Methods results: After stimulation, number multinucleated on nanotube scaffolds was significantly larger than that nonconductive (5% 10% w/v polyurethane). In myoblasts also differentiated scaffolds, as evidenced by expression Myf-5...

<b><i>Introduction:</i></b> A variety of factors have been identified in the literature which influence survival following resection colorectal liver metastases (CRLM). Much this is historical, and its relevance to contemporary practice not known. The aim study was identify those during era preoperative chemotherapy patients undergoing CRLM a UK centre. <b><i>Methods:</i></b> All having for an 11-year period up 2011 were from prospectively...

The cultivated strawberry ( Fragaria × ananassa ) is an economically important fruit crop that intensively bred for improved sensory qualities. diversity of flavors and aromas in results mainly from the interactions sugars, acids, volatile organic compounds (VOCs) are derived diverse biochemical pathways influenced by expression many genes. This study integrates multiomic analyses to identify QTL candidate genes multiple aroma a complex breeding population. Novel was discovered methyl...

Abstract Background The exceptional physical-chemical properties of carbon nanotubes have lead to their use in diverse commercial and biomedical applications. However, utilization has raised concerns about human exposure that may predispose individuals adverse health risks. present study investigated the susceptibility cardiac ischemic injury following a single various forms multi-walled (MWCNTs). It was hypothesized oropharyngeal aspiration MWCNTs exacerbates myocardial ischemia reperfusion...

In the treatment of bacterial infections, antibiotics have proven to be very effective, but way in which are dosed can create a lag time between administration drug and its absorption at site insult. The it takes an antibiotic reach therapeutic levels often significantly increased if vascular system is compromized. Bacteria multiply pending delivery drug, therefore, developing treatments that inhibit inflammatory response while waiting for take effect could help prevent medical conditions...

The photoluminescent and electroluminescent properties of near-infrared (near-IR) emitting lanthanide monoporphyrinate complexes, Ln(TPP)L (L = hydridotris(1-pyrazolyl)borate (Tp) or (cyclopentadienyl)tris(diethylphosphinito)cobaltate(I) L(OEt)) blended into conjugated nonconjugated polymer hosts were characterized. A blue-emitting alkoxy-substituted poly(p-phenylene) (PPP-OR11) was used as the host included polystyrene, poly(methyl methacrylate), poly(n-butyl poly(bisphenol A-carbonate)....

Abstract: To extend the external control capability of drug release, iron oxide nanoparticles (NPs) encapsulated into polymeric microspheres were used as magnetic media to stimulate release using an alternating field. Chemically synthesized NPs, maghemite or hematite, and antibiotic ciprofloxacin together within polycaprolactone microspheres. The entrapping NPs could be triggered for immediate by stimulation at a maximum value 40%. Moreover, cytocompatible with fibroblasts in vitro cell...