bluuebunny/crossref_metadata_2025_split huggingface dataset:
Synthesis and characterization of Na-X, Na-A and Na-P zeolites and hydroxysodalite from metakaolinite
Authors: Novembre D. , di Sabatino B. , Gimeno D. , Pace C. 
Published: September 2011

AbstractThe present work deals with the hydrothermal synthesis of Na zeolites (Na-A, Na-X and Na-P) and hydroxysodalite using kaolinite calcined at 650°C as starting material. The focus was on definition of the most favourable conditions for the synthesis of zeolite Na-A and Na-X from metakaolin in order to economize on both energy (i.e. synthesis temperatures) and reaction time and to enlarge the field of pure and isolated synthesized phases. Metakaolin was mixed with calculated amounts of NaOH solution and sodium silicate and five sets of experiments were carried out at ambient pressure and 68±0.1°C varying the SiO2/Al2O3ratio from 2.2 to 7. Optimal conditions for crystallization of Na-A zeolite from kaolinite were reached with a SiO2/Al2O3ratio of 2.2 plus 4 M NaOH without adding sodium silicate; transformation into hydroxysodalite develops after ∼8 h. For SiO2/Al2O3ratios between 4 and 7, crystallization of the separate Na-X zeolite phase could be achieved and transformation into Na-P and hydroxysodalite occurred after 382 h and 190 h, respectively. For SiO2/Al2O3 ratios between 5 and 6, transformation of metakaolin into Na-X plus Na-A, hydroxysodalite and Na-P occurred, and the field within which Na-A and Na-X zeolite exists overlapped that of the other zeolites.The products of synthesis were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), inductively coupled plasma optical emission spectrometry (ICP-OES), infrared spectroscopy (IR) and thermal analyses (TG-DTG-DTA).Obtaining pure Na-A and Na-X zeolite from kaolinite treated at low metakaolinitization temperature (650°C) and low hydrothermal synthesis temperature (68°C) represents a considerable economic advantage in terms of both energy and time.
Clay mineral assemblages as palaeoclimatic indicators in a shallowing carbonate lacustrine system: Oligocene- Miocene, central Ebro Basin (NE Spain)
Authors: Mayayo M. J. , Yuste A. , Luzόn A. , Bauluz B. 
Published: September 2011

AbstractThis paper focuses on the clay mineralogy (using XRD, SEM and TEM methods) of the lacustrine “Calizas de Torrente de Cinca” unit that represents the Oligocene-Miocene transition in the central part of the Ebro Basin (NE Spain). Phyllosilicates are mainly detrital although Mgsmectites could have been generated in the lake.Although a temperate, relatively humid climate dominated the source area during the Oligocene-Miocene transition (Chattian-Aquitanian), as deduced by detrital phyllosilicates assemblage, mineralogical vertical trends along with sedimentological studies indicate some changes.Relatively warmer and more humid conditions during the late Chattian, that favoured increasing chemical weathering, were replaced during the early Aquitanian by drier conditions coinciding with the Mi-1 glaciation effects; this change is coeval with a transition from deeper to shallower lacustrine facies.Phyllosilicate association analysis has also permitted an improvement in the palaeogeographical sketch and infers that the Pyrenees are the main source area for the lacustrine system.
,Landschaft‘ im Mittelalter? oder: Warum die Landschaft angeblich der Moderne gehört
Authors: Pfeiffer Jens 
Published: September 2011

Abstract
The Middle Ages and their landscapes are the implicit, rather than the direct, subject of this essay. Through an ex negativo consideration of medieval presuppositions and perspectives on landscapes, the essay shows why the concept of ‘nature as landscape’ was only truly conceivable in the modern period: a fact which has led to certain blind spots in the scholarly examination of landscapes in both the modern and medieval periods.
Der Sturm des Lebens: Unwetterbeschreibungen bei Ovid (Tristia 1, 2 und 1, 4) und Hildebert von Lavardin (Carmina minora 22)
Authors: Bettenworth Anja 
Published: September 2011

Abstract
The first book of Ovid's ‘Tristia’, apparently written by Ovid on his way into exile, contains several descriptions of a sea-storm. Two elegies dealing exclusively with the topic (Trist. 1.2 and 1.4) are located remarkably close to one another. Both sea-storms have convincingly been interpreted as reflections of the turmoil of the exile's life. But various explanations have been put forward to explain the doublet and its position in book 1. This article argues that elegies 1.2 and 1.4 contain most elements of an epic “sea storm”, except for the loss of one or more of the protagonist’s companions. The loss of the “companions” on the other hand, is a central topic in Trist. 1.3, which describes the exile’s last night in Rome. The frame provided by the two descriptions allows the storm and the farewell to Rome to function as a single unit, thus stressing its character as a reflection of the speaker’s tempestuous life. The article goes on to compare the reception of the poems by Hildebert of Lavardin (carm. min. 22) and explains some of its similarities and differences.
Der Berg als Bildmetapher in der Kunst des Mittelalters
Authors: Saurma-Jeltsch Lieselotte E. 
Published: September 2011

Abstract
The “rediscovery” of landscapes in the 14 th Century marks one of the great innovations in western European painting. For centuries the theme of landscape was of little interest. Of course landscapes existed as scenic or narrative elements, but painters never aspired to a mimetic description of a particular landscape. However motifs of landscape do appear as signs embedded in a long formal and also literary tradition. For example, a single mountain or a single tree can function iconically by representing as an entire forest or landscape tout court. Often a single mountain merely signifies the locus of a narrative action, but the appearance in the picture of mountain landscape opens a wider field of meanings. Mountains are – in Greek mythology as well as in the biblical tradition – places of the appearance of God, they are places of inspiration, of passion and of asceticism. Indeed, in some pictures a close relationship unfolds between actor and mountain. Nature gains vivid emotions and assumes an active role, which often surpasses that of humans. In these cases the mountain may suffer with the hero, may augment the sense of pride associated with victory, or may even vicariously outperform him. These different meanings of the mountain are explored through exemplars drawn mainly from medieval illuminated manuscripts.
Das Erlebnis der Landschaft bei Enea Silvio Piccolomini/Pius II.
Authors: Esch Arnold 
Published: September 2011

Abstract
The landscape descriptions in the ‘Commentarii’ of Pius II represent a characteristic element of this autobiographical text. One might ask whether his depictions of nature stem from own experience and encounters, or whether the landscapes depict a fictitious and literary world and are thus a construct of a humanist whose text abounds with classical citations. The following article addresses this topic from two directions. On the one hand the Pope’s physical presence in the open landscape is verified through reference to other sources; on the other hand his specific way of perceiving and describing nature is investigated. The letters of his entourage and the dispatches of diplomats do show that excursions took place as described by Pius, and that the journeys of this gout-ridden pope even into impassable areas convinced them of his love for nature. Pius’ companions affirm, often with a certain critical distance, his intimate bond with the landscape; they speak of picnics on the banks of a brook rather than in the neighbouring villa, of work-sessions in the forest instead of the palace, and of spectacular views from arduous mounted heights. All of this implied a logistical organization on the part of the courtiers, to which they were not accustomed. Pius’ description of views both near and far, and his desire to be in the midst of nature attest directly to a certain feeling characteristic of the early Italian Renaissance feeling, an epoch whose art too perceives landscape in a new form.
Ridge Preservation With or Without an Osteoinductive Allograft: A Clinical, Radiographic, Micro‐Computed Tomography, and Histologic Study Evaluating Dimensional Changes and New Bone Formation of the Alveolar Ridge
Authors: Brownfield Lauren A. , Weltman Robin L. 
Published: September 2011

Background: The aim of this randomized, controlled clinical trial is to determine whether ridge preservation using an osteoinductive allograft (test) would prevent ridge resorption and promote bone maturation compared to extraction alone (control).Methods: Seventeen patients (20 total sites), in need of a non‐molar extraction and delayed implant placement were randomly selected to receive either ridge preservation or extraction alone. A cone‐beam computed tomography was completed with a radiographic stent in place before extraction and 10 to 12 weeks postoperatively for dimensional and buccal plate analyses. Bone cores were taken for micro‐computed tomography (microCT) and histologic analyses.Results: Resorption of the alveolar ridge occurred at all sites with no statistically significant differences found between test and control sites. A significant correlation was found between the initial buccal plate thickness and the loss of vertical ridge height. microCT and histologic analyses found a mean new bone volume of 44.9% with microCT and 37.4% with histology in test sites and 39% and 35.5%, respectively, in control sites. The residual graft volume was 2.4% with microCT and 4.5% with histology.Conclusions: Test and control sites lost similar amounts of alveolar ridge, with the loss of buccolingual width occurring predominately at the expense of the buccal bone. A thicker buccal plate was associated with less ridge loss in the vertical dimension. The percentage of new bone was not statistically significant between either the test or control sites, using either microCT or histologic analyses.
Reparability of Aged Silorane With Methacrylate-Based Resin Composite: Micro-Shear Bond Strength and Scanning Electron Microscopy Evaluation
Authors: Giachetti L , Russo D Scaminaci , Baldini M , Goracci C , Ferrari M 
Published: September 2011

Clinical Relevance
Aged silorane composite restorations can be repaired with a methacrylate-based resin composite by using a phosphate-methacrylate–based adhesive as the intermediate layer.
Comparison of Fracture Strength of Endocrowns and Glass Fiber Post-Retained Conventional Crowns
Authors: Biacchi GR , Basting RT 
Published: September 2011

Clinical Relevance
Restorations of the endocrown type are options for restoring endodontically treated molar teeth with extensive loss of coronal structure. The endocrown has advantages over the conventional crown because its mechanical performance is better, it costs less, and it takes less clinical time to complete.
Use of multivariate statistical techniques to optimize the separation of isoflavones by liquid chromatography
Authors: Baranowska Irena , Magiera Sylwia , Baranowski Jacek 
Published: September 2011

AbstractThe aim of this paper is to optimize and validate a high performance liquid chromatography (HPLC) method for separation and quantification of five isoflavones. A statistical central composite design was used to separate all peaks. These multivariate procedures were efficient in determining the optimal separation condition using resolution, capacity factor, asymmetry and number of theoretical plates. The effective separation of the examined compounds was applied on a Develosil RP Aqueous AR 5 RP-30 column with a gradient mobile phase system and a DAD detector. The isolation and preconcentration of the isoflavones from urine and plasma samples were conducted by means of the solid-phase extraction (SPE). For optimize SPE conditions various sorbents were tested. Furthermore, high recoveries and good relative standard deviations were obtained when the samples were passed through the Oasis HLB column. The developed method was validated and successfully applied for determination of isoflavones in urine and plasma.
Complexation of [2.2]paracyclophane with β- and γ-cyclodextrins studied by HPLC and NMR
Authors: Dodziuk Helena , Bielejewska Anna , Schilf Wojciech , Ueda Haruhisa 
Published: September 2011

Abstract
The NMR spectra of [2.2]paracyclophane with β- or γ-cyclodextrin in DMF-d7 at room temperature do not show significant complexation, while HPLC of the complexes in mixed H2O:alcohol solvents demonstrate complexation with different stoichiometries. At 243 K in DMF solution the H3 and H5 NMR signals of γ-cyclodextrin (but not β) exhibit complexation-induced chemical shifts denoting complex formation. According to HPLC, at room temperature the [2.2]paracyclophane complex with β-cyclodextrin in 20% H2O:EtOH exhibits 1:2 stoichiometry with K 1 = 1×102 ± 2, K 2 = 9.0×104 ± 2×103 (K = 9×106) while that with γ-cyclodextrin in 50% H2O:MeOH exhibits 1:1 stoichiometry with K 1 = 4×103 ± 150 M−1. Thermodynamic parameters for both complexes have been estimated from the retention time temperature dependence. For the β-cyclodextrin complexation at 25°C ΔG 0CD is −39.7 kJ mol−1 while ΔH 0CD and ΔS 0CD are −88.2 kJ mol−1 and −0.16 kJ mol−1 K−1. For γ-cyclodextrin, the corresponding values are ΔG 0CD = −20.5 kJ mol−1, ΔH 0CD = −33.5 kJ mol−1 and ΔS 0CD = −0.04 kJ mol−1 K−1.
Methodological study of extraction procedures applied to urban particulate matter
Authors: Sysalova Jirina , Szakova Jirina , Goessler Walter , Tremlova Jana 
Published: September 2011

AbstractThe modified BCR three-step sequential extraction procedure has been applied to two different samples of urban particulate matters (PM). The distribution of selected trace elements As, Cd, Cr, Mn, Ni, Pb, Zn was investigated and, in a comparative study, the presence of common organic air filters in extraction procedures was evaluated. Analytes in separate fractions were determined by ICP-OES and GFAAS, respectively, depending on concentration levels. While, due to air filters, a significant increase of some analytes mobility in individual fractions has been observed in case of the jet-milled PM (tunnel Letna), but in case of the PKC sample such effect was not found. The analyte impurities built in some filters has been tested, and the impact on the reliability of analyte results has been discussed. The arsenic species occurrence and their stability in presence of air filters (size 47 mm) were investigated in both urban PM samples as well, using HPLC-ICP-MS technique. Water soluble and by three-step BCR procedure extractable arsenic forms are shown in chromatograms
Physicochemical characteristics of 2-, 3- and 4-methylpyridinium tetrachloroferrates(III)
Authors: Wyrzykowski Dariusz , Wera Michał , Sikorski Artur , Jacewicz Dagmara , Chmurzyński Lech 
Published: September 2011

AbstractThe crystal structure of 2-methylpyridinium tetrachloroferrate(III) was determined. The iron cation is tetracoordinated by chloride anions, and it adopts a slightly distorted tetrahedral coordination with three angles smaller, two almost equal and one larger than the tetrahedral. The compound is isostructural with its 3-, and 4-methylpyridinium analogues. The thermal properties of 2-, 3- and 4-methylpyridinium tetrachloroferrates(III) have been studied using TG and DSC techniques. The compounds exhibit a high stability in the melt.
Distribution of Inflammatory Cells, Adhesion Molecules, Intermediate Filaments, and Chemokine Receptors in Subgroups of Nasal Polyp Patients
Authors: Onerci Metin , Elsurer Cagdas , Guzel Elif E. , Dagdeviren Attila 
Published: September 2011

Background The pathogenesis of nasal polyps (NPs) is incompletely understood. The aim of this study was to investigate the distribution of inflammatory cells, adhesion molecules, intermediate filaments, and chemokine receptors in subgroups of NP patients. Methods In total, 35 patients were enrolled (group 1, 10 patients with Samter syndrome; group 2, 10 patients with diffuse polyposis without signs of Samter syndrome; group 3: 5 patients with solitary nasal polyps; group 4, 10 controls). Immunohistochemical staining was performed for CD105, CD106, CD62E, CD4, CD8, CXCR4, CD147, CD90, CD104, BF45, vimentin, pancytokeratin, and muscle-specific actin (MSA) in all patients’ specimens. Results Expression of CD4, CD8, and CD106 were similar between the groups. Number of patients expressing CD4 in groups 1, 2, and 3 were higher than the controls. Number of patients expressing CD8 antigen were significantly higher in all three groups than in the control group. Expression of CD147 in groups 3 and 4 was significantly higher than in groups 1 and 2. CD98 expression was higher in groups 1, 2, and 3 than in group 4. The number of patients expressing vimentin in groups 1, 2, and 3 was significantly higher than in group 4. Immunostaining for pancytokeratin was positive in all patients. Conclusion In conclusion, inflammatory cell, adhesion molecule, intermediate filament, and chemokine receptor profiles in nasal polyps differ among different patient groups and control subjects. Additional specific immunohistochemical studies are necessary for development of more specific immunotherapies.
Advancements in Computed Tomography Management of Chronic Rhinosinusitis
Authors: Leung Randy , Chaung Katrina , Kelly Jason L. , Chandra Rakesh K. 
Published: September 2011

Background Advances in cone beam computed tomography (CBCT) technology have allowed for reduction in radiation dosages as well as the miniaturization of CT scanner units. This has given rise to new applications for CT scanning, including point-of-care (POC) in-office and intraoperative applications. Methods A review of recent changes to radiological modalities as applied to otolaryngology–head and neck surgery was performed. A discussion of the physics, applications, and role of diagnostic imaging in the evaluation of chronic rhinosinusitis (CRS) is conducted. Results The adaptation of cone beam technology has allowed for the practical implementation of CT scanning at the bedside, be it in the clinic or operating room setting. Conclusion Given their relative low cost, ease of storage, and low-dose radiation exposure, POC-CT scanners have become an indispensable tool in the diagnosis and treatment of CRS. In the setting of increasing antibiotic costs, overtreatment with antibiotics, and fewer required return visits, POC-CT challenges the conventional role of empiric medical therapy before progression to imaging for the diagnosis of CRS.
Spirometric Parameters and Levels of Interferon Gamma and IL-5 in Induced Sputum from Patients with Allergic Rhinitis or Asthma
Authors: Marra Sheila M.G. , Borges Rosiane O. , Alves Ronaldo , Silva Deise A.O. , Taketomi Ernesto A. , Segundo Gesmar R.S. 
Published: September 2011

Background This study was designed to analyze spirometric parameters and cytokine (interferon [IFN] gamma and IL-5) levels in induced sputum from patients with asthma or allergic rhinitis (AR) and nonatopic subjects. Methods Thirty-three subjects aged 18–60 years were enrolled in the present study. Eight patients had asthma without AR symptoms, 16 had AR without asthma symptoms or history, and both groups had positive skin-prick test (SPT) to aeroallergens. The nine remaining subjects were healthy nonatopic subjects with negative SPT to aeroallergens. Spirometry was performed by evaluating the forced vital capacity (FVC), forced expiratory volume in the 1st second (FEV 1 ), and forced expiratory flow between 25 and 75% (FEF 25–75 ) of FVC before and after bronchodilator use. Induced sputum samples were also collected for measuring cytokine (IFN-gamma and IL-5) levels by enzyme-linked immunosorbent assay. Results Significant pre- and postbronchodilator change was observed only for FEV 1 with higher variation values in asthmatic subjects compared with patients with AR (p < 0.05) and nonatopic subjects (p < 0.01). There was no significant difference in pre- and postbronchodilator spirometric parameters among the three groups, although asthmatic patients showed lower prebronchodilator FEF 25–75 values (p = 0.065). IL-5 levels were higher in induced sputum from patients with asthma and AR compared with nonatopic subjects (p = 0.020 and p = 0.032, respectively), but IFN-gamma levels showed no significant difference between the groups. Conclusion Spirometric measurements were not able to show any occurrence of bronchial constriction in patients with AR, but predominant IL-5 levels in induced sputum from these patients reinforce the role of Th2-type immune response in lower respiratory airways that could contribute to the concept of “one airway, one disease.”
The Characterization of IL-17A Expression in Patients with Chronic Rhinosinusitis with Nasal Polyps
Authors: Jiang Xiao-Dan , Li Guang-Yu , Li Lin , Dong Zhen , Zhu Dong-Dong 
Published: September 2011

Background Interleukin (IL)-17A, mainly produced by Th17 cells, was previously described as an inflammatory cytokine that induces a profile of proinflammatory cytokines, chemokines, and metalloproteinases. Recent studies have revealed that IL-17 is correlated with inflammatory lung disorders by triggering an accumulation of neutrophils. More recently, we have shown that the expression of IL-17 may be involved in the development of nasal polyps (NPs). Here, we describe the characterization of IL-17 expression in patients with chronic rhinosinusitis with nasal polyps (CRSwNPs) from northeast China. Methods Histopathological observations and immunohistochemical (IHC) staining for IL-17, IL-17RD, myeloperoxidase, and CD68 were performed on 52 specimens (42 NPs and 10 specimens of middle turbinate as normal control). Double IHC staining was performed to determine which cells expressed IL-17. The serum expression levels of IL-17 were determined by ELISA and the mRNA expression of IL-17 and Th17 cells transcription factor retinoid acid–related orphan receptor C (RORc) was determined by real-time quantitative polymerase chain reaction. Results 42.9% of CRSwNP specimens presented eosinophilic inflammation; 35.7% of CRSwNP specimens presented neutrophilic inflammation. Relatively higher mRNA expression levels of IL-17 and RORc were seen in CRSwNPs compared with the controls. A marked increase of IL-17 and IL-17RD proteins (p < 0.01) were seen in CRSwNP group. The expression levels of IL-17 and RORc did not differ between eosinophilic and noneosinophilic CRSwNPs (p > 0.05). However, high expression levels of IL-17RD were seen in noneosinophilic CRSwNPs compared with eosinophilic CRSwNPs (p < 0.05). The serum expression of IL-17 in CRSwNP patients was similar to healthy controls. The IL-17 expressing cells mainly were the macrophages as shown by double IHC staining. Conclusion Chinese CRSwNP patients showed an enhanced Th17 response regardless of eosinophilic or noneosinophilic inflammation. IL-17 may be involved in the development of NPs through its local immune modulation.