bluuebunny/crossref_metadata_2025_split huggingface dataset:
A comparison of survival of moulded monoblock and modular tibial components of 751 AGC total knee replacements in the treatment of rheumatoid arthritis
Authors: Himanen A.-K. , Belt E. A. , Lehto M. U. K. , Hämäläinen M. M. J. 
Published: May 2007

We evaluated the survival of moulded monoblock and modular tibial components of the AGC total knee replacement in patients with rheumatoid arthritis. Between 1985 and 1995, 751 knees with this diagnosis were replaced at our institution. A total of 256 tibial components were of the moulded design and 495 of the modular design. The mean follow-up of the moulded subgroup was 9.6 years (0.5 to 14.7), and that of the modular group 7.0 years (0.1 to 14.7). The groups differed significantly from each other in Larsen grade, cementing of components and patellar resurfacing, but no statistically significant difference between the survival of the components was found (Log rank test, p = 0.91). The cumulative success rate of the moulded group was 96.8% (95% confidence interval 93.6% to 98.4%) at five years and 94.4% (95% confidence interval 90.4% to 96.7%) at ten years, and of the modular group 96.2% (95% confidence interval 94% to 97.6%) and 93.6% (95% confidence interval 89.7% to 96%), respectively. Revision was required in 37 total knee replacements, the main causes were infection, pain, loosening of the tibial component and patellar problems. Survival rates for both components were satisfactory.
Factors affecting the stability of screws in human cortical osteoporotic bone
Authors: Thiele O. C. , Eckhardt C. , Linke B. , Schneider E. , Lill C. A. 
Published: May 2007

We investigated several factors which affect the stability of cortical screws in osteoporotic bone using 18 femora from cadavers of women aged between 45 and 96 years (mean 76). We performed bone densitometry to measure the bone mineral density of the cortical and cancellous bone of the shaft and head of the femur, respectively. The thickness and overall bone mass of the cortical layer of the shaft of the femur were measured using a microCT scanner. The force required to pull-out a 3.5 mm titanium cortical bone screw was determined after standardised insertion into specimens of the cortex of the femoral shaft. A significant correlation was found between the pull-out strength and the overall bone mass of the cortical layer (r2 = 0.867, p < 0.01) and also between its thickness (r2 = 0.826, p < 0.01) and bone mineral density (r2 = 0.861, p < 0.01). There was no statistically significant correlation between the age of the donor and the pull-out force (p = 0.246), the cortical thickness (p = 0.199), the bone mineral density (p = 0.697) or the level of osteoporosis (p = 0.378). We conclude that the overall bone mass, the thickness and the bone mineral density of the cortical layer, are the main factors which affect the stability of a screw in human female osteoporotic cortical bone.
Urokinase Plasminogen Activator Receptor Affects Bone Homeostasis by Regulating Osteoblast and Osteoclast Function
Authors: Furlan Federico , Galbiati Clara , Jorgensen Niklas R , Jensen Jens-Erik B , Mrak Emanuela , Rubinacci Alessandro , Talotta Francesco , Verde Pasquale , Blasi Francesco 
Published: May 2007

Abstract
The uPAR and its ligand uPA are expressed by both osteoblasts and osteoclasts. Their function in bone remodeling is unknown. We report that uPAR-lacking mice display increased BMD, increased osteogenic potential of osteoblasts, decreased osteoclasts formation, and altered cytoskeletal reorganization in mature osteoclasts.
Introduction: Urokinase receptor (uPAR) is actively involved in the regulation of important cell functions, such as proliferation, adhesion, and migration. It was previously shown that the major players in bone remodeling, osteoblasts and osteoclasts, express uPAR and produce urokinase (uPA). The purpose of this study was to investigate the role of uPAR in bone remodeling.
Materials and Methods: In vivo studies were performed in uPAR knockout (KO) and wildtype (WT) mice on a C57Bl6/SV129 (75:25) background. Bone mass was analyzed by pQCT. Excised tibias were subjected to mechanical tests. UPAR KO calvaria osteoblasts were characterized by proliferation assays, RT-PCR for important proteins secreted during differentiation, and immunoblot for activator protein 1 (AP-1) family members. In vitro osteoclast formation was tested with uPAR KO bone marrow monocytes in the presence of macrophage-colony stimulating factor (M-CSF) and RANKL. Phalloidin staining in osteoclasts served to study actin ring and podosome formation.
Results: pQCT revealed increased bone mass in uPAR-null mice. Mechanical tests showed reduced load-sustaining capability in uPAR KO tibias. uPAR KO osteoblasts showed a proliferative advantage with no difference in apoptosis, higher matrix mineralization, and earlier appearance of alkaline phosphatase (ALP). Surface RANKL expression at different stages of differentiation was not altered. AP-1 components, such as JunB and Fra-1, were upregulated in uPAR KO osteoblasts, along with other osteoblasts markers. On the resorptive side, the number of osteoclasts formed in vitro from uPAR KO monocytes was decreased. Podosome imaging in uPAR KO osteoclasts revealed a defect in actin ring formation.
Conclusions: The defective proliferation and differentiation of bone cells, coincident with both aberrant expression of transcription factors and cytoskeletal organization, are typical uPAR-dependent molecular phenotypes, and we have now shown their function in osteoblasts and osteoclasts function in vivo.
Treatment of Gingival Overgrowth in a Child With Bardet‐Biedl Syndrome
Authors: Drugowick Rayen Millanao , Da Rós Gonçalves Lorena , Barrôso Áurea Simone , Feres‐Filho Eduardo Jorge , Maia Lucianne Cople 
Published: May 2007

Background: Bardet‐Biedl syndrome (BBS) is a rare, heterogeneous, autosomal recessive condition, primarily characterized by polydactyly, obesity, mental retardation, hypogonadism, retinopathy, and renal failure. Dental anomalies, regarded as secondary manifestations, include hypodontia, microdontia, short roots, and deep palate. Few reports in the literature have described the oral manifestations of BBS. This article reports a case of BBS in a boy who presented some typical oral manifestations added to a generalized gingival overgrowth, an anomaly that had not been reported previously in patients with this syndrome.Methods: A 12‐year‐old white male presented with a diagnosis of BBS and chief complaint of gingival enlargement in the anterior segment of both arcades. The treatment plan included surgical removal of the overgrown gingiva followed by orthodontic therapy. The excised tissues were submitted to histologic analysis.Results: There was no sign of recurrence 1 year after gingivectomy. Histopathology revealed a dense connective tissue with a mild inflammatory infiltrate, irregularly arranged fiber bundles, and epithelial acanthosis, which is characteristic of gingival overgrowth.Conclusions: The gingival overgrowth was treated successfully by gingivectomy. The periodontal surgery minimized the functional, social, and emotional consequences of the oral manifestation associated with the syndrome.
Interviewing Self‐Reported Highly Anxious Patients During Periodontal Treatment
Authors: Fardal Øystein , Hansen B. Frode 
Published: May 2007

Background: Little information exists on highly anxious patients referred for periodontal therapy.Methods: All patients referred for periodontal therapy between November 1, 2002 and April 1, 2004 were included in this study. Patients who perceived themselves as extremely anxious were interviewed further, and their anxiety levels were observed during the various stages of periodontal therapy.Results: Twenty‐one (19 females and two males, average age, 49.76 years) of 176 patients (12.1%) reported extreme anticipatory anxiety. The main reasons for their anxiety were fear of pain and previous bad experience(s).Conclusions: Average anxiety levels decreased with the progress of the periodontal therapy. However, individual responses varied greatly and were unpredictable.
Hypoplasminogenemia With Ligneous Periodontitis: A Failed Local Therapeutic Approach
Authors: Kurtulus Idil , Gokbuget Aslan , Efeoglu Ahmet , Cintan Serdar , Tefs Katrin , Schuster Volker , Scully Crispian 
Published: May 2007

Background: Hypoplasminogenemia is a rare condition that is associated with ligneous conjunctivitis, a form of chronic conjunctivitis characterized by firm, fibrin‐rich, pseudomembranous lesions on the tarsal conjunctivae and oral lesions. Pseudomembranes may develop on the gingivae, and there may be periodontal involvement.Methods: Several therapeutic approaches have been developed to treat such patients, but they have had limited effect. We used gingivectomies, topical heparin, and corticosteroids to treat periodontal lesions in an 18‐year‐old girl.Results: This approach had no benefit.Conclusion: The question remains about how best to manage patients with hypoplasminogenemia.
Streamline Technology for the Evaluation of Full-Field Compositional Processes: Midale—A Case Study
Authors: McKishnie R. A. , Malik S. , Chugh S. , Lavoie R. G. , Griffith P. J. 
Published: May 2007

SummaryTraditionally, the evaluation of CO2-flooding processes is performed with finite-difference compositional-simulation models. However, compositional simulation is impractical for modeling large-scale CO2 floods because of computational run-time restrictions. In cases in which reservoir heterogeneity and fluid mobility dominate the reservoir recovery mechanism, streamline simulation offers a viable alternative to compositional simulation. The "reduced" physics in streamline simulation allows field-scale CO2-flood modeling to be feasible, as long as the streamline pressure/volume/ temperature (PVT) model can be calibrated so that the streamline model will produce accurate results for CO2-injection processes. Using streamline simulation allows for the evaluation of multiple full-field development scenarios that otherwise would not be possible with compositional simulation.The objective of the study was to provide CO2-flood performance forecasts under various full-field development scenarios for the Midale field. This paper focuses on the methodology and results from the 1,000-well, &gt;400,000-gridblock, 45+-year streamline simulation of the Midale field. In particular, it discusses the construction and history match of the full-field model, the calibration of the streamline model with the compositional model, and the development of the full-field CO2 forecasts.
Parental narratives on genetic testing for children with hearing loss: A qualitative inquiry
Authors: Steinberg Annie G. , Kaimal Girija , Bain Lisa , Krantz Ian , Li Yuelin 
Published: May 2007

AbstractStudies on parental attitudes towards genetic testing for hearing loss have surveyed parents of newborns with hearing loss as well as deaf and hearing adults. Although research indicates that most people have positive attitudes about genetic testing, few studies examine parental narratives about the personal implications of genetic hearing loss in their children. In this qualitative study we conducted semi‐structured interviews with 24 parents whose children had been referred for, but had not yet undergone, genetic testing for hearing loss. The parents were recruited to represent a diverse range of racial, ethnic, and socioeconomic groups. Genetics and genetic testing for hearing loss were poorly understood topics. Beyond supporting or opposing genetic testing for hearing loss, parents' construction of meaning included struggles to locate responsibility (metaphysical attributions, ascription or alleviation of parental responsibility) as well as questions about the usefulness and implications of genetic testing for hearing loss in their child. Based on the themes that emerged from this study, we highlight the need for healthcare professionals to be aware and sensitized to parents' narratives, personal meanings and socio‐cultural context when referring them for genetic testing for hearing loss. Listening attentively to parental narratives can help minimize prevailing misconceptions among parents and enable appropriate medical care and education. © 2007 Wiley‐Liss, Inc.
A case for genetics education: Collaborating with speech‐language pathologists and audiologists
Authors: Harvey Erin K. , Stanton Susan , Garrett Jennifer , Neils‐Strunjas J. , Warren Nancy Steinberg 
Published: May 2007

AbstractBecause speech‐language pathologists (SLPs) and audiologists (AUDs) are among the first referrals for parents of children exhibiting feeding, speech, language, hearing, and balance difficulties, it is important for SLP and AUD professionals to recognize genetic causes of and contributions to complex and Mendelian communication disorders. We review genetics in the curricula of speech‐language pathology and audiology programs and obstacles to its integration throughout curricula. We present suggestions about how SLPs and AUDs can aid in diagnosis and contribute their clinical expertise in characterizing phenotypes, followed with a review of a new genetics‐education website developed by the National Coalition for Health Professional Education in Genetics (NCHPEG), the University of Cincinnati, and the National Society of Genetic Counselors. The need to integrate genetics content into curricula and continuing education across disciplines is clear, as is the need for and benefit of multidisciplinary collaboration in patient care. The NCHPEG site for speech‐language pathology and audiology begins to address those needs and may serve as a practical model for future multidisciplinary collaborations between genetics professionals and other health professions. © 2007 Wiley‐Liss, Inc.
A General Variational Criterion for Chemically Active Continuous Media
Authors: Lebon G. J. , Lambermont J. H. 
Published: May 2007

AbstractA variational criterion describing the nonstationary flow of a mixture of chemically active compressible fluid components is presented. The problem considered constitutes a generalization of previous works [1, 2] of the authors.It is shown that the Euler‐Lagrange equations corresponding to arbitrary variations of the chemical potentials, the velocity components, and the temperature are identical to the laws of conservation of mass of each component, of momentum, and of entropy, respectively.
One‐Particle Distribution Functions and Thermodynamics of Crystals with Many‐Body Forces. III. Perturbation Theory
Authors: Zubov V. I. 
Published: May 2007

AbstractThe theory of crystalline state described in preceding papers is considered as a zeroth‐order approximation. Statistical perturbation theory is used for the purpose of improving this approximation. The second‐order corrections to the Helmholtz free energy and thermodynamic properties of strongly anharmonic crystals are derived. The properties of solid Ar, Kr, and Xe are calculated using various pair‐potential functions in conjunction with the AXILROD‐TELLER‐MUTO three‐body potential. The first quantum corrections are taken into account in the quasi‐classical approximation. The result of computations are compared with the experimental data.
Widths of Decays of Intermediate Bosons of One‐Particle Exchange Models and Cross‐Section of Leptonic Weak Processes at Resonance
Authors: Guliyev N. A. , Jafarov I. G. , Khalil‐Zade F. T. 
Published: May 2007

AbstractThe widths of the intermediate bosons introduced in one‐particle exchange models of weak interactions are found. The cross‐sections of the leptonic processes are calculated and analyzed in the region of resonance.
Über die Existenz von Entropiefunktionen in Nichtgleichgewichtszuständen chemischer Reaktionssysteme II
Authors: West G. 
Published: May 2007

AbstractFür solche chemischen Reaktionssysteme, welche unter Isolation von der Umwelt ins Gleichgewicht streben, kann die Existenz (mehrerer) Nichtgleichgewichtsentropiefunktionen mit Hilfe der Umkehrsätze zu den Ljapunovschen Sätzen bewiesen werden. Ein Vergleich mit der Thermodynamik irreversibler Prozesse zeigt, daß die Symmetrie der Onsagermatrix eine starke Einschränkung der nichtlinearen Reaktionskinetik zur Folge hat. Die Gültigkeit des Prinzips von Braun und Le Chatelier ist eine notwendige Voraussetzung dafür, daß es unter den Nichtgleichgewichtsentropiefunktionen eine gibt, welche die Potentialeigenschaft hat.
Calculation of the Hyperfinestructure and gJ‐Values of the 3d 4s 4p‐Configuration of Scandium
Authors: Siefart E. 
Published: May 2007

AbstractWave functions for the 3d 4s 4p, 3d2 4p and 4s2 4p configurations of ScI are calculated, taking into account departures from SL‐coupling and configuration interaction and on fitting the radial integrals to the experimental fine structure energies. Using these wave functions gJ‐values are derived.The intermediate coupled hfs matrix elements of the 3d 4s 4p configuration are reduced to the unknown electron coupling constants as, ap and ad and calculated on estimating these constants from the spin‐orbit coupling constants and fitting them to some experimental A‐values.By this way the absolute phases of the experimental A((1P)2D)‐ and A((1P)2F)‐values are obtained.Good agreement between calculated and most experimental data has been achieved.
On Caustics and Singularities in General Relativity
Authors: v. Borzeszkowski H.‐H. , Paul H. 
Published: May 2007

AbstractComparing gravitational converging effects with self‐focussing and lense effects in ordinary optics, we consider some physical properties of caustics in General Relativity. The resulting relations between geometrical and physical features of caustics are used to discuss the power asymptotes of homogeneous cosmological models in more detail.
Saturated Multi‐Photon‐Absorption of a Nonmonochromatic Quantized Field
Authors: Mohr Ulrike 
Published: May 2007

AbstractBy extending a previously developed method [9] to the case of saturation, the interaction of a nonmonochromatic light beam with a saturable m‐photon‐absorber (m = 1, 2,…) is theoretically investigated for frequency widths of the incident light being small compared to the bandwidth of the absorber. It turns out that by averaging the exact Heisenberg equation of motion of the operator for the slowly varying field amplitude with respect to the atomic relaxation time and by taking the expectation value over the absorbing atomic system a reduced single‐mode equation can be derived, which refers to a mode volume precisely defined in physical terms. The resulting reduced Heisenberg equation of motion for the radiation field is compared to the single‐mode density matrix equation following from the method of SCULLY and LAMB. For ideal laser light and for chaotic light it is used to study the change of photon statistics in dependence on the degree of saturation and on the ratio of inhomogeneous and homogeneous linewidth.
Resonances and Fluctuations in Nuclear Reaction Cross Sections
Authors: Rotter I. 
Published: May 2007

AbstractOn the basis of the continuum shell model, an expression for the S‐matrix is derived. The external mixing between shape resonances and resonance states of complicated nuclear structure is investigated. It is shown that the doorway properties of the shape resonances may lead to an l‐dependent transparency of the optical potential and, consequently, to an energy dependence of large back angle scattering if the unitarity of the S‐matrix is taken into account.
Negative Zeitentwicklung bei der kernmagnetischen Resonanz in Flüssigkristallen
Authors: Schmiedel H. , Hillner B. , Grande S. 
Published: May 2007

AbstractIn orientierten smektischen Flüssigkristallen ist es möglich, ohne Anwendung zusätzlicher Hochfrequenzimpulse durch eine sprunghafte mechanische Drehung der Probe ein magisches Echo der kernmagnetischen Protonenresonanz zu erzeugen. Dieses neuartige Zeitumkehrexperiment wird am Beispiel des NPOB beschrieben und im Zusammenhang mit dem Spintemperaturkonzept diskutiert.
Ionisierungspotentiale von Halbleiterkristallen und Abschätzung von Energiesprüngen an Heteroübergängen
Authors: Unger K. , Neumann H. 
Published: May 2007

AbstractAusgehend von lokalen empirischen Pseudopotentialen wird die Energie des oberen Valenzbandrandes bezogen auf das mittlere effektive Einelektronenpotential berechnet, um Ionisierungspotentiale für Si, Ge und neun III‐V‐Verbindungen zu bestimmen. Hierfür wird das auf das Vakuumniveau bezogene mittlere Einelektronenpotential unter Einschluß von Austausch und Korrelation in einem Bindungsladungsmodell ermittelt. Die Ergebnisse stimmen gut mit den experimentellen Werten überein, wenn zur Anpassung der berechneten Bandstrukturen nicht nur optische, sondern auch röntgenspektroskopische und Photoemissionsdaten herangezogen werden. Zum Vergleich werden auch Experimente an Heteroübergängen herangezogen, die Aufschlüsse über die auftretenden Energiesprünge liefern.
Landau‐Theorie zum Phasenübergang isotrop flüssig‐nematisch bei Flüssigkristallen
Authors: Kühnel A. , Schiele K. , Trimper S. 
Published: May 2007

AbstractIm Rahmen der Landau‐Theorie wird das statische Verhalten am Phasenübergang isotrop flüssig‐nematisch berechnet. Zusätzlich zum üblichen Ordnungsparameter für die Orientierung der Rümpfe werden noch ein oder mehr Ordnungsparameter für die Orientierung der Ketten eingeführt, die miteinander verkoppelt sind. Die Temperaturabhängigkeit der Ordnungsparameter und die spezifische Wärme in der Nähe des Phasenübergangs werden erhalten und mit verschiedenen experimentellen Ergebnissen verglichen.
Über die Ankopplung des Gravitationsfeldes in der Quantenfeldtheorie
Authors: Kreisel Eckhard 
Published: May 2007

AbstractEs werden Argumente dafür gegeben, daß die Ankopplung der Gravitation in der Quantenfeldtheorie zu verschiedenen Hilberträumen in den Punkten der Mannigfaltigkeit führt. Die Gleichung für die Zustände im Heisenberg‐Bild wird durch eine Vorschrift für den Paralleltransport von Zuständen ersetzt. Es wird ein Zusammenhang zwischen der Messung von vollständigen Observablensystemen an verschiedenen Orten und der Parallelität von Zuständen hergestellt.
Energy Levels of Doubly Excited States in Argon
Authors: El‐Sherbini Th. M. , Allam S. H. 
Published: May 2007

AbstractTerm energies of doubly excited states in argon and argon ions have been determined using single‐configuration Hartree‐Fock calculation.The energies calculated for KL3s3p6nl and KL3s63p4nln1 states of Ar show a fairly good agreement with the experimental results obtained by various techniques. However, for Ar+, Ar2+, Ar2+ and Ar3+ states there are no experimental data available in the literature for comparison.
Synchronisationseffekte in einer linearen Anordnung aus N Josephson‐Verbindungen
Authors: Krech W. 
Published: May 2007

AbstractIm Rahmen des RSJ‐Modells untersuchen wir die Synchronisation der Oszillationen in einer linearen. Anordnung von N identischen Josephsonverbinungen, die durch einen elektromagnetischen Resonator geshuntet sind. Mit Hilfe einer adiabatischen Approximation erster Ordnung in dem Parameter Ic/I werden verkürzte Gleichungen für die langsam variierenden Phasen hergeleitet. Diese Gleichungen gestatten die detaillierte Untersuchung aller stationären Zustände des Systems. Stabil erweisen sich nur der kohärente Zustand im induktiven Regime und der strahlungslose Zustand im kapazitiven Regime. Unter Einbeziehung von Rauscheffekten wird das Ordnungsparameterkonzept des Resonatorstroms für den Fall N ≫ 1 diskutiert.