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  • 1
    Electronic Resource
    Electronic Resource
    Effect of bur type and conditioning on the surface and interface of dentine (2005)
    Oxford, UK : Blackwell Science Ltd
    Journal of oral rehabilitation 32 (2005), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: summary  The purpose of this in vitro study was to evaluate the surface and resin–dentine interface characteristics of permanent tooth dentine cut with diamond or carbide burs and treated with phosphoric acid (PA) or an acidic conditioner. Labial surfaces of permanent incisors were prepared into dentine with high-speed carbide or diamond burs and divided into two halves. Phosphoric acid 36% was applied on one half and non-rinse conditioner (NRC) was applied on the other half. Ten randomly selected scanning electron microscopy (SEM) fields from each specimen (n = 15) were evaluated. Occlusal surfaces of third molars were divided in two halves for evaluation of the resin–dentine interface. The halves were randomly assigned to one of each conditioner and restored with Prime & Bond NT/Spectrum. Ten specimens were analysed by SEM to evaluate hybrid layer formation and interfacial seal. We observed that surfaces prepared with carbide bur presented less residual smear plugs (P 〈 0·05) than surfaces prepared with diamond burs. Surfaces conditioned with NRC, which is a smear layer modifier, presented more residual smear plugs than surfaces conditioned with PA (P 〈 0·05). Treatment with PA resulted in more sealed interfaces than specimens treated with NRC. Within the limitations of this study the results showed that carbide burs leave a surface that is more conducive to bonding than diamond burs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2842.2005.01507.x
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  • 2
    Electronic Resource
    Electronic Resource
    Determination of urinary ammonium: a practical class experiment designed to introduce medical students to mechanisms of extracellular and intracellular pH homeostasis
    Amsterdam : Elsevier
    Biochemical Education 22 (1994), S. 215-216 
    Details
    ISSN: 0307-4412
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0307-4412(94)90016-7
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  • 3
    Electronic Resource
    Electronic Resource
    Copper(II) complex of 2-(benzylamino)-2-deoxy-D-glycero-D-talo heptonic acid: Synthesis and characterization.
    Amsterdam : Elsevier
    Journal of Inorganic Biochemistry 51 (1993), S. 155 
    Details
    ISSN: 0162-0134
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0162-0134(93)85191-A
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  • 4
    Electronic Resource
    Electronic Resource
    Foreign body ingestion: Management of 167 cases (1991)
    Springer
    World journal of surgery 15 (1991), S. 783-788 
    Details
    ISSN: 1432-2323
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Les résultats de notre expérience du traitement de 167 cas de corps étranger ingérés entre 1980 et 1986 ont été revus. Deux patients ont refusé le traitement proposé (1.1%). Une attitude conservatrice a pu Être adoptée chez 14 patients (8.4%). Une endoscopie à visée thérapeutique a été pratiquée chez 117 patients: elle a été efficace dans 85.5% des cas, avec un taux de complications de 1.7%, sans mortalité. La chirurgie a été nécessaire chez 51 patients (30.0%), dont 14 échecs de l'endoscopie. Il y a eu un taux de 17.6% de complications et un complications de 1.7%, sans mortalité. La chirurgie a été nécessaire chez 51 patients (30.0%), dont 14 échecs de reposer sur l'utilisation judicieuse de l'endoscopie et/ou de la chirurgie.
    Abstract: Resumen En una revisión del manejo de 167 casos de ingestion de cuerpos extraños en el período 1980–86 se observaron los siguientes resultados. Dos pacientes rehusaron tratamiento (1.1%); tratamiento conservador fue intentado en 14 (8.4%); se realizó endoscopia en 117, con una tasa global de éxito de 85.5%, una tasa de complicaciones de 1.7% y ninguna muerte. El tratamiento quirÚrgico fue necesario en 51 pacientes (30.0%); 14 habían tenido endoscopia no exitosa, con una tasa de complicaciones de 17.6% y 1 muerte (1.9%) debida a fistula aortoesofágica. Se plantean conclusiones relativas al manejo de cuerpos extranos combinando la técnica de endoscopia de fibra óptica con cirugía.
    Notes: Abstract We reviewed the management of 167 patients with foreign body ingestion from 1980 to 1986. Two patients (1.1%) refused treatment. Nonoperative management was attempted in 14 (8.4%) patients. Endoscopy was performed on 117 patients with an overall success rate of 85.5% and a complication rate of 1.7%. Surgical treatment was required in 51 (30.0%) patients, 14 of whom had previous unsuccessful endoscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01665320
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  • 5
    Electronic Resource
    Electronic Resource
    Two questions on the geometry of gauge fields (1994)
    Springer
    Foundations of physics 24 (1994), S. 783-800 
    Details
    ISSN: 1572-9516
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We first show that a theorem by Cartan that generalizes the Frobenius integrability theorem allows us (given certain conditions) to obtain noncurvature solutions for the differential Bianchi conditions and for higher-degree similar relations. We then prove that there is no algorithmic procedure to determine, for a reasonable restricted algebra of functions on spacetime, whether a given connection form satisfies the preceding conditions. A parallel result gives a version of Gödel's first incompleteness theorem within an (axiomatized) theory of gauge fields.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02054673
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  • 6
    Electronic Resource
    Electronic Resource
    Pseudosinkhole occurrences in Brasilia, Brazil (1994)
    Springer
    Environmental geology 23 (1994), S. 36-40 
    Details
    ISSN: 1432-0495
    Keywords: Sinkholes ; Laterite ; Brazil
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Brasilia, the capital city of Brazil, is located in the central region of the country. Climate in the area is semitropical with an annual rainfall of 1500 mm. The geological environment in the area consists of low-grade metamorphic rocks. Slates of varying colors, metasiltstone, and quartzite beds are present. Over the Precambrian rocks is a lateritic layer varying in thickness from centimeters up to 30 m. Latosol dominates the existing plateaus, while laterite crusts and immature soils are dominant in the transition zones between plateaus and river valleys. Erosional problems related to the lateritic terrains were known prior to the settlement of the city in 1961. During 1986, erosion became a serious threat when several pseudosinkholes occurred in the urban area. Occurrence of pseudosinkholes resulted in condemnation of an area of 300,000 m2 and the demolition of several buildings. Preliminary studies indicated at the time that underground erosion and pseudosinkholes were generated by shortening of the percolation path of groundwater due to the progress, toward the residential area, of large gullies. This produced an increase in the hydraulic gradient, resulting in the removal of latosol particles. Occurrence of pseudosinkholes in other areas of the city has led the Institute of Geosciences to investigate the problem in more detail. Studies have been conducted looking for correlation between pseudosinkhole occurrence and geologic, geomorphic, geotechnical, and urban development features. Recent results show a much more complex process then previously thought. Field data suggests that termite activity and recharge of the water table by inadequate disposal of residential sewer systems are directly related to the problem.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00773137
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  • 7
    Electronic Resource
    Electronic Resource
    Trapezoid osteotomy for slipped capital femoral epiphysis (2000)
    Springer
    International orthopaedics 24 (2000), S. 83-87 
    Details
    ISSN: 1432-5195
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé  23 patients avec épiphysiolyse fémorale supérieure de l’adolescent ont été traités utilisant une ostéotomie modifiée avec résection trapézo sous-capitale. Tous les déplacement ont été de plus de 60 degrees. La moyenne de la période d’étude a été de 70 mois (54–93 mois). On a retrouvé un resultat excellent ou bon en 18 hanches, passable en 1, et médiocre en 4 hanches. La nécrose céphalique s’est developpée en 3 hancles et la chondrolyse en 2.
    Notes: Abstract  Twenty-three patients with chronic or acute to chronic slip of the capital femoral epiphysis were treated using a modified trapezoid osteotomy of the femoral neck. All slips were greater than 60°. After a follow-up period of 70 (54–93) months, the results were excellent or good in 18 hips, fair in 1, and poor in 4 hips. Avascular necrosis developed in 3 hips, and chondrolysis in 2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002640000107
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  • 8
    Electronic Resource
    Electronic Resource
    External fixation of intertrochanteric fractures of the femur (1995)
    Springer
    International orthopaedics 19 (1995), S. 217-219 
    Details
    ISSN: 1432-5195
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Dans la période de Juillet 1992 à Avril 1994, 40 patients présentant des fractures transtrochantériennes ont eu un traitement chirurgical par fixateur externe. Ces cas ont été sélectionnés à cause du grand risque chirurgical qu'ils présentaient. L'évaluation radiographique a été faite en période post-opératoire immédiate, puis à 30 et à 90 jours. Les résultats ont été analysés en fonction de l'évolution clinique et de la consolidation osseuse. Ce travail montre que le fixateur externe utilisé dans les fractures inter-trochantériennes est une bonne méthode pour les patients présentant un risque chirurgical élevé.
    Notes: Summary Forty patients with intertrochanteric fractures of the femur were treated by external fixation between July 1992 and April 1994. They were selected because of their high surgical risk, and evaluated by radiographs immediately after operation, and at 30 and 90 days. The results indicate that external fixation is a useful method of treatment for this type of patient.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00185225
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  • 9
    Electronic Resource
    Electronic Resource
    Fractures of the humerus in arm wrestling (1995)
    Springer
    International orthopaedics 19 (1995), S. 390-391 
    Details
    ISSN: 1432-5195
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Les auteurs rapportent deux cas de fracture spiroïde de l'humérus pendant un »bras de fer« sans complication neurologique. La fréquence de la fracture, la cause et le mécanisme sont discutés.
    Notes: Summary Two cases of spiral fracture of the humerus, which occurred during arm wrestling, are reported. The possible mechanism is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00178356
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  • 10
    Electronic Resource
    Electronic Resource
    A random-walk approach to interference (1994)
    Springer
    International journal of theoretical physics 33 (1994), S. 179-189 
    Details
    ISSN: 1572-9575
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this paper we sketch a probabilistic particle approach requiring no separate concept of wave to obtain interference. We describe in some detail how things work from a physical standpoint and show with a number of figures how the standard wave concepts are developed from purely particle random walks. For the wave concepts we have in each case a matching probability concept. The preliminary theory developed here is qualitative and stresses the physical character of the assumptions. In particular, we show that the periodic behavior of light is derived from the source and not from individual photons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00671623
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