bluuebunny/crossref_metadata_2025_split huggingface dataset:
Mucocele of the Appendix: Case Report and Review of Literature
Authors: Demetrashvili Zaza , Chkhaidze Mamuka , Khutsishvili Kakhi , Topchishvili Gega , Javakhishvili Tamar , Pipia Irakli , Qerqadze Vakhtang 
Published: October 2012

Abstract
Appendiceal mucocele is a rare disease. Sometimes it is discovered accidentally and sometimes it resembles acute appendicitis. Correct diagnosis before surgery is very important for the selection of adequate surgical treatment to avoid intraoperative and postoperative complications. Ultrasonography, and particularly computed tomography, should be used extensively for this purpose. If mucocele is treated incorrectly pseudomyxoma peritonei, which is characterized by malignant process, may develop. We present a case of a 54-year-old man who was admitted to the emergency department with the signs of acute appendicitis. Open surgery was performed. At the time of surgery, a cystic mass of the appendix with dimensions 7 × 4 ×3 cm, with inflamed walls, but without perforation was discovered in the right iliac fossa. No discharge was found in the peritoneal cavity. Diagnosis of mucocele was suspected. Only appendectomy was performed because no pathologic process was found in the base of the appendix and lymph nodes were not increased in size. Hystopathologic diagnosis was mucinous cystadenoma. After 2 years, the patient is feeling well.
Torsion of the Gallbladder Diagnosed by Magnetic Resonance Cholangiopancreatography
Authors: Fukuchi Minoru , Nakazato Kenji , Shoji Hisanori , Naitoh Hiroshi , Kuwano Hiroyuki 
Published: October 2012

Abstract
Torsion of the gallbladder is a rare entity that is difficult to diagnose preoperatively, the principal differential diagnosis being cholecystitis. The condition occurs most often in the elderly. Although its etiology is unknown, the presence of a redundant mesentery is a prerequisite for torsion. Computed tomography, ultrasound, and magnetic resonance cholangiopancreatography can provide important diagnostic clues. Torsion of the gallbladder occurs when it twists axially, with subsequent occlusion of bile or blood flow. Therefore, prompt surgical treatment is necessary in order to prevent necrosis and perforation. In the present study, we report a case of torsion of the gallbladder diagnosed by magnetic resonance cholangiopancreatography. This condition was successfully treated by laparoscopic cholecystectomy.
Clinical Outcomes After Restorative Proctocolectomy With Ileal Pouch Anal Anastomosis Using Ultrasonically Activated Scalpel for Ulcerative Colitis
Authors: Ikeuchi Hiroki , Uchino Motoi , Matsuoka Hiroki , Bando Toshihiro , Takesue Yoshio , Tomita Naohiro 
Published: October 2012

Abstract
We compared 3 different initial operative procedures performed in patients with ulcerative colitis who underwent an ileal pouch anal anastomosis (IPAA) procedure with a Harmonic Scalpel (HS). We selected 775 patients who underwent a restorative proctocolectomy with a mucosectomy using an HS and hand-sewn IPAA. Ninety-six patients underwent a total colectomy (3-stage procedure) as the initial operation, whereas 258 underwent IPAA without ileostomy (1-stage procedure) and 421 underwent IPAA with ileostomy (2-stage procedure). There were no significant differences regarding early pouch functional rate among the 3 groups. After 5 years with a functioning ileal pouch, the survival rates for the total colectomy, IPAA with ileostomy, and IPAA without ileostomy groups were 100%, 99.3%, and 99.0%, respectively. There was low operative mortality, and acceptable rates of early and late complications in patients with ulcerative colitis who underwent a restorative proctocolectomy and IPAA using an HS.
Home Treatment of Uncomplicated Acute Diverticulitis
Authors: Rueda Juan C. , Jimenez Andrea , Caro Aleidis , Feliu Francisco , Escuder Jorge , Gris Fernando , Spuch Juan , Vicente Vicente 
Published: October 2012

Abstract
Diverticular disease of the colon is a common disease, mainly in the population over 50 years of age. In acute forms of presentation, we considered home treatment in those patients that were classified as having uncomplicated forms by means of clinical presentation and a computed tomography of the abdomen. According to these criteria, we treated 38 patients at home and admitted 18 patients to the hospital during the same period of time. No severe complications developed in the home-treatment patients. Home treatment is an effective alternative treatment for patients with uncomplicated acute diverticulitis. In uncomplicated acute diverticulitis, home treatment benefits the patient, over hospitalization, by allowing better management of resources and by keeping the patient in a familiar environment where there is no risk of a nosocomial infection.
Phylogeography of mitochondrial haplogroup D1: An early spread of subhaplogroup D1j from Central Argentina
Authors: García Angelina , Pauro Maia , Nores Rodrigo , Bravi Claudio M. , Demarchi Darío A. 
Published: October 2012

AbstractWe analyzed the patterns of variation of haplogroup D1 in central Argentina, including new data and published information from other populations of South America. Almost 28% (107/388) of the individuals sampled in the region belong to haplogroup D1, whereas more than 52% of them correspond to the recently described subhaplogroup D1j (Bodner et al.: Genome Res 22 (2012) 811–820), defined by the presence of additional transitions at np T152C–C16242T–T16311C to the nodal D1 motif. This lineage was found at high frequencies across a wide territory with marked geographical–ecological differences. Additionally, 12 individuals present the mutation C16187T that defines the recently named subhaplogroup D1g (Bodner et al.: Genome Res 22 (2012) 811–820), previously described in populations of Patagonia and Tierra del Fuego. Based on our results and additional data already published, we postulate that the most likely origin of subhaplogroup D1j is the region of Sierras Pampeanas, which occupies the center and part of the northwestern portion of Argentina. The extensive yet restricted geographical distribution, the relatively large internal diversity, and the absence or low incidence of D1j in other regions of South America suggest the existence of an ancient metapopulation covering the Sierras Pampeanas, being this lineage its genetic signature. Further support for a scenario of local origin for D1j in the Sierras Pampeanas stems from the fact that early derivatives from a putative ancestral lineage carrying the transitions T16311C–T152C have only been found in this region, supporting the hypothesis that it might represent an ancestral motif previous to the appearance of D1j‐specific change C16242T. © 2012 Wiley Periodicals, Inc.
Applications of momentary Fourier transform in frequency shift keying signal demodulation
Authors: Chen Zhonghui , Xu Yiwen , Wang Weixing , Feng Xinxin 
Published: October 2012

SUMMARYPower line communication is attracting increasing attention for its characteristics of easy availability and low cost. Frequency shift keying with the virtue of antijamming capability is suitable for the low signal‐to‐noise ratio power line environment. The principle of the frequency shift keying communication system based on momentary Fourier transform (MFT) algorithm is provided first in this paper. Theoretically, the twiddle factor in the MFT algorithm is a decimal with infinite length. However, when it is applied on digital signal processor (DSP), the registers with finite length in DSP lead to the inaccuracy of the twiddle factor. Thus, the MFT algorithm with recursive form will cause accumulative error as a result. We analyze the impact of the inaccurate twiddle factor on the MFT algorithm from a novel point of view, by which the MFT algorithm is considered as a linear time invariant system. We prove that the accumulative error would not disperse when the modulus of the twiddle factor is smaller than 1. Simulation results show that the truncation approach is more effective than both carrying and rounding methods in a practical system. In addition, the number of significant digits of truncated twiddle factor must be chosen larger than 4 to overcome the problem of accumulative error.Copyright © 2012 John Wiley & Sons, Ltd.
The 4.1B cytoskeletal protein regulates the domain organization and sheath thickness of myelinated axons
Authors: Einheber Steven , Meng Xiaosong , Rubin Marina , Lam Isabel , Mohandas Narla , An Xiuli , Shrager Peter , Kissil Joseph , Maurel Patrice , Salzer James L. 
Published: October 2012

AbstractMyelinated axons are organized into specialized domains critical to their function in saltatory conduction, i.e., nodes, paranodes, juxtaparanodes, and internodes. Here, we describe the distribution and role of the 4.1B protein in this organization. 4.1B is expressed by neurons, and at lower levels by Schwann cells, which also robustly express 4.1G. Immunofluorescence and immuno‐EM demonstrates 4.1B is expressed subjacent to the axon membrane in all domains except the nodes. Mice deficient in 4.1B have preserved paranodes, based on marker staining and EM in contrast to the juxtaparanodes, which are substantially affected in both the PNS and CNS. The juxtaparanodal defect is evident in developing and adult nerves and is neuron‐autonomous based on myelinating cocultures in which wt Schwann cells were grown with 4.1B‐deficient neurons. Despite the juxtaparanodal defect, nerve conduction velocity is unaffected. Preservation of paranodal markers in 4.1B deficient mice is associated with, but not dependent on an increase of 4.1R at the axonal paranodes. Loss of 4.1B in the axon is also associated with reduced levels of the internodal proteins, Necl‐1 and Necl‐2, and of alpha‐2 spectrin. Mutant nerves are modestly hypermyelinated and have increased numbers of Schmidt‐Lanterman incisures, increased expression of 4.1G, and express a residual, truncated isoform of 4.1B. These results demonstrate that 4.1B is a key cytoskeletal scaffold for axonal adhesion molecules expressed in the juxtaparanodal and internodal domains that unexpectedly regulates myelin sheath thickness. © 2012 Wiley Periodicals, Inc.
Tailoring of processing parameters for sintering microsphere‐based scaffolds with dense‐phase carbon dioxide
Authors: Jeon Ju Hyeong , Bhamidipati Manjari , Sridharan BanuPriya , Scurto Aaron M. , Berkland Cory J. , Detamore Michael S. 
Published: October 2012

AbstractMicrosphere‐based polymeric tissue‐engineered scaffolds offer the advantage of shape‐specific constructs with excellent spatiotemporal control and interconnected porous structures. The use of these highly versatile scaffolds requires a method to sinter the discrete microspheres together into a cohesive network, typically with the use of heat or organic solvents. We previously introduced subcritical CO2 as a sintering method for microsphere‐based scaffolds; here we further explored the effect of processing parameters. Gaseous or subcritical CO2 was used for making the scaffolds, and various pressures, ratios of lactic acid to glycolic acid in poly(lactic acid‐co‐glycolic acid), and amounts of NaCl particles were explored. By changing these parameters, scaffolds with different mechanical properties and morphologies were prepared. The preferred range of applied subcritical CO2 was 15–25 bar. Scaffolds prepared at 25 bar with lower lactic acid ratios and without NaCl particles had a higher stiffness, while the constructs made at 15 bar, lower glycolic acid content, and with salt granules had lower elastic moduli. Human umbilical cord mesenchymal stromal cells (hUCMSCs) seeded on the scaffolds demonstrated that cells penetrate the scaffolds and remain viable. Overall, the study demonstrated the dependence of the optimal CO2 sintering parameters on the polymer and conditions, and identified desirable CO2 processing parameters to employ in the sintering of microsphere‐based scaffolds as a more benign alternative to heat‐sintering or solvent‐based sintering methods. © 2012 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2013.
Consistent Gaussian basis sets of triple‐zeta valence with polarization quality for solid‐state calculations
Authors: Peintinger Michael F. , Oliveira Daniel Vilela , Bredow Thomas 
Published: October 2012

AbstractConsistent basis sets of triple‐zeta valence with polarization quality for main group elements and transition metals from row one to three have been derived for periodic quantum‐chemical solid‐state calculations with the crystalline‐orbital program CRYSTAL. They are based on the def2‐TZVP basis sets developed for molecules by the Ahlrichs group. Orbital exponents and contraction coefficients have been modified and reoptimized, to provide robust and stable self‐consistant field (SCF) convergence for a wide range of different compounds. We compare results on crystal structures, cohesive energies, and solid‐state reaction enthalpies with the modified basis sets, denoted as pob‐TZVP, with selected standard basis sets available from the CRYSTAL basis set database. The average deviation of calculated lattice parameters obtained with a selected density functional, the hybrid method PW1PW, from experimental reference is smaller with pob‐TZVP than with standard basis sets, in particular for metallic systems. The effects of basis set expansion by diffuse and polarization functions were investigated for selected systems. © 2012 Wiley Periodicals, Inc.
Profiling of mercapturic acids of acrolein and acrylamide in human urine after consumption of potato crisps*
Authors: Watzek Nico , Scherbl Denise , Feld Julia , Berger Franz , Doroshyenko Oxana , Fuhr Uwe , Tomalik‐Scharte Dorota , Baum Matthias , Eisenbrand Gerhard , Richling Elke 
Published: October 2012

ScopeAcrolein (AC) and acrylamide (AA) are food contaminants generated by heat treatment. We studied human exposure after consumption of potato crisps by monitoring excretion of mercapturic acids (MAs) in urine.Methods and resultsMA excretion was monitored in human urine collected up to 72 h after ingestion of a test meal of experimental (study 1: 1 mg AA/150 g) or commercially available (study 2: 44 μg AA plus 4.6 μg AC/175 g) potato crisps. MA contents were analysed after purification via SPE using HPLC‐ESI‐MS/MS. On the basis of the area under the curve values of MAs excreted in urine, the total excretion of AC‐related MAs exceeded that of AA‐related MAs up to 12 times in study 1 and up to four times in study 2. Remarkably, AC content of potato crisps of study 2 was found to be only about 1/10 the AA content, as determined by isotope dilution headspace GC/MS.ConclusionOur results indicate substantially higher exposure to AC from potato crisps than to AA. Total AC in such foods may encompass bioavailable AC forms not detected by headspace GC/MS. Both findings may also apply to other heat processed foods.
Conductivity and methanol permeability of sulfonated polystyrene membrane with dispersed montmorillonite nanoclay
Authors: Chen Yu‐Nung , Chung Pei‐Yuan , Yen Shi‐Chern 
Published: October 2012

AbstractSulfonated polystyrene membranes with dispersed montmorillonite (MMT) nanoclay were prepared and their conductivities, methanol permeabilities and other characteristics were presented in this study. Sulfonated polystyrene membranes were recast by employing various solvents such as dimethyl sulfoxide (DMSO), chlorobenzene/n‐butanol, chlorobenzene/DMSO and toluene/n‐butanol. These solvents enhanced the ratio of proton conductivity to methanol permeability (C/P ratio) of sulfonated polystyrene membranes, especially DMSO. To reduce the methanol permeability, surfactant‐modified MMT nanoclay, which has a large surface area, was blended with sulfonated polystyrene. The methanol permeability of the sulfonated polystyrene with dispersed nanoclay is 1/10 the value of Nafion® and the activation energy of methanol permeability is about 28 kJ/mol. As DMSO was used as a solvent, the conductivity over permeability ratio of the membrane with 14.38% sulfonation was double the value of Nafion®. POLYM. COMPOS., 2012. © 2012 Society of Plastics Engineers
Synthesis of silver nanoparticles in electrospun polyacrylonitrile nanofibers using tea polyphenols as the reductant
Authors: Zou MeiLing , Du MingLiang , Zhu Han , Xu CongSheng , Li Ni , Fu YaQin 
Published: October 2012

AbstractUniformly dispersed Ag nanoparticles (AgNPs) with diameter about 5 nm embedded in electrospun polyacrylonitrile (PAN) nanofibers were synthesized by using tea polyphenols (TP) as the reductant. The reducing ability of TP toward Ag ions was characterized by Fourier transform infrared spectroscopy and ultraviolet–visible spectra, and the results revealed that TP exhibit satisfied reducing ability in the synthesis process. Transmission electron microscopy observation showed that the synthesized spherical AgNPs with diameter about 5 nm were immobilized on the surface and in the interior of PAN nanofibers by electrospinning technology. The interactions of Ag with PAN and TP were investigated by X‐ray photoelectron spectroscopy (XPS), and the results suggested that PAN polymer and TP both served as stabilizer during the synthesis of AgNPs because of the chelating interactions of Ag with cyano groups and phenolic hydroxyls. The synthesized AgNPs in PAN nanofibers exhibit good antibacterial property and may be used for antibacterial and catalytic applications. POLYM. ENG. SCI., 2013. © 2012 Society of Plastics Engineers
Properties of coconut shell powder‐filled polylactic acid ecocomposites: Effect of maleic acid
Authors: Chun Koay Seong , Husseinsyah Salmah , Osman Hakimah 
Published: October 2012

AbstractEcocomposites were produced by incorporating coconut shell powder (CSP) into polylactic acid (PLA) resin. The effect of filler content and chemical modification on the mechanical properties, thermal properties, and morphology of PLA/CSP ecocomposites were investigated. The addition of filler has decreased the tensile strength and elongation at break of PLA/CSP ecocomposites. However, tensile strength and modulus of elasticity of PLA/CSP ecocomposites were enhanced by maleic acid treatment. Meanwhile, glass transition temperature (Tg) and crystallinity (Xc) of PLA/CSP ecocomposites increased at 30 php of filler content and increased the presence of maleic acid (MA). However, the melting temperature (Tm) and crystallization temperature (Tc) were not significantly changed with the filler content and MA modification The thermal stability of PLA/CSP ecocomposites increased with the CSP content. The MA modification improved the thermal stability of PLA/CSP ecocomposites through better filler–matrix interaction. The improvement was confirmed by scanning electron microscope study. POLYM. ENG. SCI., 2013. © 2012 Society of Plastics Engineers
Preparation and characterization of polypyrrole/selenium composites
Authors: Ozkazanc Ersel , Zor Sibel , Ozkazanc Hatice , Gumus Serap 
Published: October 2012

AbstractThis article reports synthesis of polypyrrole (PPy) and its composites having various amounts of selenium (Se) in the presence of nitric acid in aqueous medium via chemical oxidative polymerization. Samples were spectroscopically characterized using Fourier transform infrared spectroscopy, ultraviolet‐visible spectroscopy, and atomic absorption spectroscopy. Although morphology of the samples was examined by using scanning electron microscopy (SEM), their thermal properties were studied via differential scanning calorimetry (DSC). The alternating current (ac) conductivity and dielectric properties were investigated as a function of temperature. Variation of adsorption free energy obtained from Langmuir adsorption isotherm showed that metal cations were physically adsorbed onto the polymer surface. SEM images showed that filling process significantly changes the morphology of PPy. DSC results indicated that cold crystallization temperature (Tcc) of unfilled PPy decreases with increasing filling level. Dielectric measurements showed that relaxation times for PPy and its composites have decreased linearly with increasing temperature. The conductivity of the PPy, when filled with 1 g of Se, increased ∼ four times at room temperature for 1 kHz. POLYM. ENG. SCI., 2013. © 2012 Society of Plastics Engineers
Multistep hydrothermal route for nanocoral architecture of anatase TiO2: synthesis and characterization of dye‐sensitized solar cell performance
Authors: Mali Sawanta S. , Shinde Pravin S. , Betty Chirayath A. , Bhosale Popatrao N. , Lee Won J. , Patil Pramod S. 
Published: October 2012

ABSTRACTMultistep hydrothermal (MSH) process is employed for growth of TiO2 nanocorals onto the conducting fluorine‐doped tin oxide‐coated glass substrates. The surface morphological features and physical properties of TiO2 films were investigated by field emission scanning electron microscopy, high resolution transmission electron microscopy, X‐ray diffraction, Fourier transform infrared spectroscopy, Fourier transform Raman spectroscopy, room temperature photoluminescence spectroscopy and X‐ray photoelectron spectroscopy. The surface morphology revealed the formation of TiO2 corals having nanosized (30–40 nm) polyps. The photoelectrochemical properties of the TiO2 nanocoral electrodes were investigated in 0.1 M NaOH electrolyte under ultraviolet illumination. The results presented in this study highlight two major findings: (i) tuning the photoelectrochemical response and photoconversion efficiency via controlled thickness of TiO2 nanocorals by MSH route and (ii) the substantial increase in short‐circuit photocurrent (Jsc) because of the improved charge transport through TiO2 nanocorals prepared via MSH process. Copyright © 2012 John Wiley & Sons, Ltd.
Utilization of geometric light trapping in thin film silicon solar cells: simulations and experiments
Authors: de Jong M. M. , Sonneveld P. J. , Baggerman J. , van Rijn C. J. M. , Rath J. K. , Schropp R. E. I. 
Published: October 2012

ABSTRACTIn this study, we present a new light absorption enhancement method for p‐i‐n thin film silicon solar cells using pyramidal surface structures, larger than the wavelength of visible light. Calculations show a maximum possible current enhancement of 45% compared with cells on a flat substrate. We deposited amorphous silicon (a‐Si) thin film solar cells directly onto periodically pyramidal‐structured polycarbonate (PC) substrates, which show a significant increase (30%) in short‐circuit current over reference cells deposited on flat glass substrates. The current of the cells on our pyramidal structures on PC is only slightly lower than that of cells on Asahi U‐type TCO glass (Asahi Glass Co., Tokyo, Japan), but suffer from a somewhat lower open circuit voltage and fill factor. Because the used substrates have a locally flat surface area due to the fabrication process, we believe that the current enhancement in the cells on structured PC can be increased using larger or more closely spaced pyramids, which can have a smaller flat surface area. Copyright © 2012 John Wiley & Sons, Ltd.