bluuebunny/crossref_metadata_2025_split huggingface dataset:
Frontoethmoid Osteoma with Bilateral Nasal Polyposis: A Rare Coexistence
Authors: LNU Rijuneeta , Singh Jagveer 
Published: October 2010

Abstract
Osteoma and nasal polyposis are common benign conditions seen by ENT practitioner, however it is very rare that both of them present together. Osteoma is the most common neoplasm of the nose and paranasal sinuses. It is commonly asymptomatic, being an incidental finding 1% of plain sinus radiographs and 3% CT scans of sinus. In an extensive review of english literature, we could not find any case reported having large osteoma with bilateral nasal polyposis. We found only two reported cases of osseous metaplasia in cases of nasal polyps but not ivory osteoma hence bilateral nasal polyposis can radiologically have association with osteoma and should be investigated and treated accordingly.
There has been a single case reported in the Spanish literature though. In current case report, we present a case of patient with bilateral nasal polyposis accompanied with unilateral frontoethmoid osteoma.
Thermoresponsive shape memory characteristics of polyurethane electrospun web
Authors: Chung Seung Eun , Park Chung Hee , Yu Woong‐Ryeol , Kang Tae Jin 
Published: October 2010

AbstractElectrospun web (ESW) was manufactured and its performance was evaluated to investigate its applicability as an intelligent clothing material using shape memory polymers. Mixtures of various compositions were applied to make the shape memory polyurethane (SMPU) films and the polyurethane with the best shape memory performance was then selected to make the ESWs. The structural and thermal properties, as well as the shape memory behavior were evaluated. The air permeability, the water vapor transmission, and the water resistance were measured. The ESW having a high orientation due to an elongation in the process of the electrospinning showed a higher melting point than the film and its shape recovery was improved. The ESW showed a good moisture and air permeability due to the fact that its structural characteristics incorporate countless nano‐sized pores. Because of this, the ESW maintained in its expanded state below the transition temperature showed improved moisture and air permeabilities. Therefore, it can be concluded that the SMPU web proved to have potential for intelligent clothing material. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
Preparation of raspberry‐like poly(methyl methacrylate) particles by seeded dispersion polymerization
Authors: Shi Shan , Zhou Limin , Wang Tao , Bian Lina , Tang Yantao , Kuroda Shin‐ichi 
Published: October 2010

AbstractThe facile preparation of nonspherical raspberry‐like poly(methyl methacrylate) (PMMA) particles by seeded dispersion polymerization of methyl methacrylate (MMA) on micron‐sized PMMA seed particles was described. Various polymerization parameters influencing the particle morphology, as well as the polymerization kinetic and morphological stability, were investigated in detail. It was found that the following polymerization conditions were necessary to prepare this kind of nonspherical particles: a relatively low temperature, an appropriate ratio of seed/MMA, an initiator with a relatively low decomposition rate, and a relatively low initiator concentration. These particles showed very good morphological stability at room temperature, but they changed to the spherical ones when heat treated at 60°C in methanol solution of MMA. The experimental results suggest that the prepared PMMA particles were kinetically favored and the localized polymerization of the MMA monomer on PMMA seed particle surface was responsible for the formation of the raspberry‐like particles. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
Degradation of poly(D,L‐lactic acid)‐b‐poly(ethylene glycol) copolymer and poly(L‐lactic acid) by electron beam irradiation
Authors: Miao Peikai , Wu Dimeng , Zeng Ke , Zhao Chun'e , Xu Guoliang , Huang Zhifu , Yang Gang 
Published: October 2010

AbstractThis article investigated the effects of electron beam (EB) irradiation on poly(D,L‐lactic acid)‐b‐poly(ethylene glycol) copolymer (PLEG) and poly(L‐lactic acid) (PLLA). The dominant effect of EB irradiation on both PLEG and PLLA was chain scission. With increasing dose, recombination reactions or partial crosslinking of PLEG can occur in addition to chain scission, but there was no obvious crosslinking for PLLA at doses below 200 kGy. The chain scission degree of irradiated PLEG and PLLA was calculated to be 0.213 and 0.403, respectively. The linear relationships were also established between the decrease in molecular weight with increasing dose. Elongation at break of the irradiated PLEG and PLLA decreased significantly, whereas the tensile strength and glass transition temperature of PLLA decreased much more significantly compared with PLEG. The presence of poly(ethylene glycol) (PEG) chain segment in PLEG was the key factor in its greater stability to EB irradiation compared with PLLA. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
Effect of stereoregularity and molecular weight on the mechanical properties of poly(vinyl alcohol) hydrogel
Authors: Fukae Ryohei , Yoshimura Miki , Yamamoto Tohei , Nishinari Katsuyoshi 
Published: October 2010

AbstractThe effect of the stereoregularity and molecular weight of poly(vinyl alcohol) (PVA) on the mechanical properties of hydrogel was investigated. Compressive strength, creep behavior, and dynamic viscoelasticity were measured on hydrogels of syndiotacticity‐rich PVA derived from poly(vinyl pivalate) (Dp = 1690 diad‐syndiotacticity = 61%, Dp = 8020 diad‐syndiotacticity = 62%) and atactic PVA (Dp = 1750 diad‐syndiotacticity = 54%, Dp = 7780 diad‐syndiotacticity = 54%). Increasing the molecular weight of molecular chains constituting the gel improved the compressive strength of atactic PVA hydrogel. The stereoregularity of PVA had a greater effect than molecular weight on the strength of the hydrogel. Gel prepared from 8.8 g/dL syndiotacticity‐rich PVA had a high compressive modulus of 10 kPa, and the compressive modulus of the gel prepared from 3.3 g/dL was comparable with that of atactic PVA hydrogel prepared with more than 6 g/dL. The dynamic storage modulus of the gel derived from syndiotacticity‐rich PVA was remarkably higher than that of the atactic PVA gel and remained constant up to 60°C. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
Post and prepolymerization strategies to develop novel photochromic poly(esterimide)s
Authors: Schab‐Balcerzak Ewa , Siwy Mariola , Jarzabek Bozena , Kozanecka‐Szmigiel Anna , Switkowski Krzysztof , Pura Bronisław 
Published: October 2010

AbstractThis paper reports novel photoresponsive, processable poly(esterimide)s functionalized with the azobenzene and tricyanovinylene groups. Post and prepolymerization strategies were utilized for preparation of the new photochromic polymers with imide rings. The postpolymerization method of azopolymer synthesis included a functionalization of precursor poly(esterimide) containing dialkylaminophenyl groups with diazonium salt of aniline. The precursor poly(esterimide) was obtained from synthesized 2,2′[N‐phenylethyloaniline‐di(4‐estro‐1,2‐dicarboxylic)]anhydride and 4,4′‐methylene bis(2,6‐dimethylaniline). The prepolymerization strategy based on polycondesation of 2,4‐diaminoazobenzene with two dianhydrides, that is, with or without the azobenzene group. The new dianhydride with azobenzene unit was obtained. The reaction of post‐tricyanovinylation was carried out for substitution of prepared polymers with tricyanovinylene groups. The synthesized polymers were characterized and evaluated by FTIR, 1H NMR, X‐ray, UV‐Vis spectroscopies, and DSC. The polymers exhibited glass transition temperatures in the range of 119–208°C and good solubilities in common organic solvents, providing optical‐quality films. Thermal stability of the polymers films was investigated by UV‐Vis spectroscopy. Preliminary investigations of the optical anisotropy in chosen poly(esterimide)s were carried out by photoinduced birefringence measurements. Relatively high photoinduced birefringence (Δn = 0.01) was measured for polyimide with covalently bonded azobenzene substituted with strong acceptor group. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
Effect of applied voltage on diameter and morphology of ultrafine fibers in bubble electrospinning
Authors: Liu Yong , Dong Liang , Fan Jie , Wang Rui , Yu Jian‐Yong 
Published: October 2010

AbstractA novel electrospinning process, bubble electrospinning, was used to produce porous nonwoven fibrous mats, of which the fiber diameter can range from nano‐ to microscales. The deformation of a charged bubble, from which multiple jets were ejected, was observed using a high‐speed motion camera. The effects of different applied voltages on diameter, morphology, and structure of bubble‐electrospun ultrafine fibers were theoretically analyzed and then experimentally validated by scanning electron microscopy and atomic force microscopy. The results showed that the average diameter of fibers increased with the increase of the applied voltage in bubble electrospinning, which is quite different from that in traditional electrospinning process under the similar conditions. The number of beaded fibers decreased with increasing applied voltage. Additionally, the crystallinities of polyvinylpyrrolidone ultrafine fibers obtained in this process were higher than that of polyvinylpyrrolidone powders. The production rate of bubble electrospinning was higher than that of the traditional electrospinning. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
Preparation and properties of nonionic polyol dispersion from terpinene‐maleic ester‐type epoxy resin
Authors: Wu Guo‐Min , Kong Zhen‐Wu , Chen Jian , Jiang Jian‐Chun 
Published: October 2010

AbstractA nonionic epoxy‐based polyol (NTP) which can be used in place of the commonly used polyol dispersions to prepare two‐component waterborne polyurethanes was synthesized with terpinene‐maleic ester‐type epoxy resin (TME), polyethylene glycol (PEG), and trimethylopropane (TMP) in the presence of sulfuric acid as catalyst. The synthesis process was tracked with gel permeation chromatography (GPC) and differential scanning calorimetry (DSC) by investigating the changes of molecular weight and glass transition temperature (Tg) of the product. FTIR was used to characterize the chemical structure of NTP. Major technical parameters of NTP were as follows: hydroxyl value 100 mg/g, hydroxyl group content 3.04%, Tg 4.03°C, and viscosity 150 mPa s (40% solid content). Effect of molecular weights and dosages of PEG on stability of NTP dispersion was examined by particle size analyses. It was found that stable dispersion was obtained when using PEG6000 as hydrophilic chain and its dosage ≥8% by the weight of TME. The average particle size of the prepared dispersion was about 200 nm from particles size and TEM analyses. The NTP dispersion showed characteristic of shear thinning, which indicated it was a pseudoplastic fluid. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
Effect of organo‐modified layered silicates on flammability performance of high‐density polyethylene/rice husk flour nanocomposite
Authors: Kord Behzad 
Published: October 2010

AbstractThis research was carried out to investigate on the effect of organomodified montmorillonite (OMMT) on the flame retarding characteristics and clay dispersion of composites based on high‐density polyethylene and rice husk flour. To meet this objective, the blend nanocomposites were prepared through the melt mixing of high‐density polyethylene and rice husk flour at 50% weight ratios, with various amounts of OMMT (0, 2, 4, and 6 per hundred compounds) in Hakee internal mixer; then, the samples were made by injection molding. Results indicated that the burning rate, total smoke production, and heat release rate of samples decreased with increasing the OMMT content. Also, the char residue and time to ignition increased with increasing the nanoclay loading. X‐ray diffraction patterns revealed that the nanocomposites formed were intercalated. Also, morphological findings showed that samples containing 2 per hundred compounds of OMMT had higher order of intercalation and better dispersion. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
Photoinduced Electron Transfer in a Distyryl BODIPY–Fullerene Dyad
Authors: Liu Jian‐Yong , El‐Khouly Mohamed E. , Fukuzumi Shunichi , Ng Dennis K. ;P. 
Published: October 2010

AbstractA novel distyryl BODIPY–fullerene dyad is prepared. Upon excitation at the distyryl BODIPY moiety, the dyad undergoes photoinduced electron transfer to give a charge‐separated state with lifetimes of 476 ps and 730 ps in polar (benzonitrile) and nonpolar (toluene) solvents, respectively. Transient absorption measurements show the formation of the triplet excited state of distyryl BODIPY in the dyad, which is populated from charge‐recombination processes in both solvents.
Impact of symptom–reflux association analysis on long-term outcome after Nissen fundoplication
Authors: Broeders J A , Draaisma W A , Bredenoord A J , Smout A J , Broeders I A , Gooszen H G 
Published: October 2010

Abstract

Background
A positive symptom association probability (SAP) is regarded as an important selection criterion for antireflux surgery by many physicians. However, no data corroborate the relationship between symptom–reflux association and outcome, nor is it clear what impact a negative SAP has on the outcome of antireflux surgery in patients with abnormal oesophageal acid exposure. This study compared long-term outcomes of Nissen fundoplication in patients with a negative versus positive SAP.

Methods
Five-year outcome of Nissen fundoplication in patients with proton-pump inhibitor (PPI)-refractory reflux and pathological acid exposure was compared between those with (SAP+, 109) and without (SAP−, 29 patients) a positive symptom association. Symptoms, quality of life (QoL), PPI use, endoscopic findings, manometry and acid exposure were evaluated.

Results
At 5 years' follow-up, relief of reflux symptoms (95 versus 87 per cent), reduction in PPI use (80 to 25 per cent versus 85 to 14 per cent; P &lt; 0·050) and improvement in QoL were similar in the SAP− and SAP+ groups. Reduction in acid exposure time (13·4 to 1·6 per cent versus 11·1 to 0·2 per cent of total time; P &lt; 0·010), improvement in oesophagitis (44 to 6 per cent versus 61 to 13 per cent; P &lt; 0·050) and increase in lower oesophageal sphincter pressure were also comparable.

Conclusion
The subjective and objective outcomes of fundoplication in patients with pathological acid exposure are comparable among those with a positive and negative SAP. Patients with pathological acid exposure and a negative SAP can also benefit from antireflux surgery.
Synthesis of Ag2O Nanocrystals with Systematic Shape Evolution from Cubic to Hexapod Structures and Their Surface Properties
Authors: Lyu Lian‐Ming , Wang Wei‐Ching , Huang Michael H. 
Published: October 2010

AbstractWe report the development of a facile method for the synthesis of Ag2O crystals with systematic shape evolution from cubic to edge‐ and corner‐truncated cubic, rhombicuboctahedral, edge‐ and corner‐truncated octahedral, octahedral, and hexapod structures by mixing AgNO3, NH4NO3, and NaOH at molar ratios of 1:2:11.8. A sufficient volume of NaOH solution was first added to a mixture of AgNO3 and NH4NO3 solution to promote the formation of Ag(NH3)2+ complex ions and the growth of Ag2O nanocrystals with good morphological control. The crystals are mostly submicrometer‐sized. X‐ray diffraction, scanning electron microscopy, and transmission electron microscopy characterization has been performed to determine the crystalline surface facets. A band gap value of approximately 1.45 eV has been found for the octahedral Ag2O crystals. By changing the molar ratios of AgNO3/NH4NO3/NaOH to 1:2:41.8, corner‐depressed rhombicuboctahedra and elongated hexapods were obtained as a result of enhanced crystal growth along the [100] directions. Smaller nanocubes with average sizes of approximately 200 and 300 nm and octapods can also be prepared by adjusting the reagent molar ratios and their added volumes. Both the octahedra and hexapods with largely silver atom‐terminated {111} surface facets responded repulsively and moved to the surface of the solution when dispersing in a solution of positively charged methylene blue, but can be suspended in a negatively charged methyl orange solution. The cubes and octapods, bounded by the {100} faces, were insensitive to the molecular charges in solution. The dramatic facet‐dependent surface properties of Ag2O crystals have been demonstrated.
Neutral and Cationic Alkylmanganese(II) Complexes Containing 2,6‐Bisiminopyridine Ligands
Authors: Pérez Carmen M. , Rodríguez‐Delgado Antonio , Palma Pilar , Álvarez Eleuterio , Gutiérrez‐Puebla Enrique , Cámpora Juan 
Published: October 2010

AbstractManganese alkyl complexes stabilised by 2,6‐bis(N,N′‐2,6‐diisopropyl‐phenyl)acetaldiminopyridine (iPrBIP) have been selectively prepared by reacting suitable alkylmanganese(II) precursors, such as homoleptic dialkyls [(MnR2)n] or the corresponding THF adducts [{MnR2(thf)}2] with the mentioned ligand. For R=CH2CMe2Ph or CH2Ph, formally MnI derivatives are produced, in which one of the two R groups migrates to the 4‐position of the central pyridine ring in the iPrBIP ligand. In contrast, a true dialkyl complex [MnR2(iPrBIP)] can be isolated for R=CH2SiMe3. In solution, this compound slowly evolves to the corresponding MnI monoalkyl derivative. A detailed study of this reaction provides insights on its mechanism, showing that it proceeds through successive alkyl migrations, followed by spontaneous dehydrogenation. Protonation of [Mn(CH2SiMe3)2(iPrBIP)] with the pyridinium salt [H(Py)2][BAr′4] (Ar′=3,5‐C6H3(CF3)2) leads to the cationic species [Mn(CH2SiMe3)(Py)(iPrBIP)]+. Alternatively, the same complex can be produced by reaction of the pyridine complex [{Mn(CH2SiMe3)2(Py)}2] with the protonated ligand salt [HiPrBIP]+[BAr′4]−. This last reaction allows the synthesis of analogous cationic alkylmanganese(II) derivatives, when precursors of type [MnR2(iPrBIP)] are not available. Treatment of these neutral and cationic iPrBIP alkylmanganese derivatives with a range of typical co‐catalysts (modified methylaluminoxane (MMAO), B(C6F5)3, trimethyl or triisobutylaluminum) does not lead to active ethylene polymerisation catalysts.
Two‐Year Clinical Outcomes After Large Coronary Stent (4.0 mm) Placement: Comparison of Bare‐Metal Stent Versus Drug‐Eluting Stent
Authors: Kim Hyun‐Tae , Nam Chang‐Wook , Hur Seung‐Ho , Kim Kwon‐Bae , Lee Sang‐Hee , Hong Geu‐Ru , Park Jong‐Seon , Kim Young‐Jo , Kim Ung , Yang Tae‐Hyun , Kim Doo‐Il , Kim Dong‐Soo 
Published: October 2010

AbstractBackground:The absolute benefit of drug‐eluting stents (DES) in low‐risk patients and lesions is not well established.Hypothesis:The long term clinical outcomes after percutaneous coronary intervention in a single coronary artery disease may not be affected by the type of stent.Methods:This study assessed and compared 2‐year clinical outcomes of 304 consecutive patients (147 BMS patients and 157 DES patients) treated with a single coronary stent (4.0 mm) for single de novo large coronary artery disease in 3 referral cardiac centers. The primary outcome was a composite of major adverse cardiac events at 2 years after the index procedure.Results:The reference vessel diameter was similar in both groups (3.92 ± 0.29 mm in BMS vs 3.95 ± 0.24 mm in DES, P = 0.50). Late loss was larger in the BMS group (1.04 ± 0.83 mm vs 0.73 ± 0.91 mm in DES, P = 0.03). The incidence of major adverse cardiac events at the 2‐year clinical follow‐up was very low, 24 of 304 patients (7.9%), regardless of stent type deployed (7.5% in BMS vs 8.3% in DES, P = 0.83). The rate of target vessel revascularization was also similar in both groups (4.8% in BMS vs 5.7% in DES, P = 0.80).Conclusions:Two‐year clinical outcomes after PCI with a single large coronary stent (4.0 mm) were excellent. The clinical outcomes were not affected by the type of stent used. Copyright © 2010 Wiley Periodicals, Inc.The authors have no funding, financial relationships, or conflicts of interest to disclose.
Autonomic Dysfunction Presenting as Orthostatic Intolerance in Patients Suffering From Mitochondrial Cytopathy
Authors: Kanjwal Khalil , Karabin Beverly , Kanjwal Yousuf , Saeed Bilal , Grubb Blair P. 
Published: October 2010

AbstractBackgroundDisturbances in autonomic nervous system function have been reported to occur in patients suffering from mitochondrial cytopathies. However, there is paucity of literature on the occurrence of orthostatic intolerance (OI) in these patients. We report on a series of patients diagnosed with mitochondrial cytopathy who developed features of autonomic dysfunction in the form of OI.MethodsThis was a single‐center report on a series of 6 patients who were followed in our clinic for orthostatic intolerance. All of these patients had a diagnosis of mitochondrial cytopathy on the basis of muscle biopsy and were being followed at a center specializing in the treatment of mitochondrial disorders. This study was approved by our local institutional review board. Each of the patients had suffered from symptoms of fatigue, palpitations, near syncope, and syncope. The diagnosis of OI was confirmed by head‐up tilt test. Collected data included demographic information, presenting symptoms, laboratory data, tilt‐table response, and treatment outcomes.ResultsSix patients (3 females) were identified for inclusion in this report. The mean age of the group was 48 ± 8 years (range, 40–60 years). All of these patients underwent head‐up tilt table testing and all had a positive response that reproduced their clinical symptoms. Among those having an abnormal tilt‐table pattern, 1 had a neurocardiogenic response, 1 had a dysautonomic response, and 4 had a postural orthostatic tachycardia response. All but 1 patient reported marked symptom relief with pharmacotherapy. The patient who failed pharmacotherapy received a dual‐chamber closed‐loop pacemaker and subsequently reported marked improvement in her symptoms with elimination of her syncope.ConclusionsOrthostatic intolerance might be a significant feature of autonomic nervous system dysfunction in patients suffering from mitochondrial cytopathy. Copyright © 2010 Wiley Periodicals, Inc.The authors have no funding, financial relationships, or conflicts of interest to disclose.
Intrabundle microtubule dynamics in the Arabidopsis cortical array
Authors: Shaw Sidney L. , Lucas Jessica 
Published: October 2010

AbstractWe tested the general hypothesis that bundling stabilizes the dynamic properties of the constituent microtubules (MTs) in vivo. We quantified the assembly dynamics of bundled and unbundled MTs in the interphase cortical array of Arabidopsis hypocotyl cells using high dynamic range spinning disk confocal microscopy. We find no evidence that bundled MTs are stabilized against depolymerization through changes to their dynamic properties. Our observations of MT plus and minus ends indicate that both bundled and unbundled polymers undergo persistent treadmilling in this system. We conclude that the temporal persistence of MT subassemblies in the Arabidopsis cortical array is largely dependent upon recruitment or nucleation of new treadmilling MTs and not on polymer stabilization. Monte Carlo simulations suggest that small differences discovered in the dynamic properties between bundled and unbundled polymers would produce relatively small macroscopic effects on the larger MT array. © 2010 Wiley‐Liss, Inc.