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  • 2000-2004
  • 1995-1999  (6)
  • 1905-1909
  • Benzodiazepine  (2)
  • Hip arthroplasty  (2)
  • elastic instability  (2)
Source
Material
Years
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Shear rheology of polymer solutions near the critical condition for elastic instability (1997)
    Springer
    Rheologica acta 36 (1997), S. 97-109 
    Details
    ISSN: 1435-1528
    Keywords: Key words Polymer migration ; anomalous rheology ; Boger fluid ; normal stress ; elastic instability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract The use of constant viscosity, highly elastic polymer solutions, so called Boger fluids, has been remarkably successful in elucidating the behavior of polymeric materials under flowing conditions. However, the behavior of these fluids is still complicated by many different physical processes occurring within a narrow window of observation time and applied shear rate. In this study, we investigate the long-time shear behavior of an ideal Boger fluid: a well characterized, athermal, dilute, binary solution of high molecular weight polystyrene in oligomeric polystyrene. Rheological measurements show that under an applied steady shear flow, this family of polymer solutions undergoes a transient decay of normal stresses on a timescale much longer than the polymer molecule‘s relaxation time. Rheological and flow visualization results demonstrate that the observed phenomenon is not caused by polymer degradation, phase separation, viscous heating, or secondary flows from elastic instabilities. Although the timescale is much shorter than that associated with polymer migration in the same solutions (MacDonald and Muller, 1996), the appearance of this phenomenon only at the rates where migration has been observed suggests that it may be a prerequisite for observing migration. In addition, we note that through sufficient pre-shearing of the sample, the normal stress decrease suppresses the elastic instability. These results show that there is considerable uncertainty in choosing the appropriate measure of the fluid relaxation time for consistently modeling the critical condition for the elastic instability, the decay of normal stresses, and the migration of polymer species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00366816
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Anatomic basis of the transgluteal approach to the hip-joint by anterior hemimyotomy of the gluteus medius (1997)
    Springer
    Surgical and radiologic anatomy 19 (1997), S. 61-67 
    Details
    ISSN: 1279-8517
    Keywords: Anatomy ; Hip arthroplasty ; Transgluteal approach
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The authors present a study of the intrinsic anatomy of the gluteus medius m. and of its innervation through the caudal branch of the superior gluteal n. The existence of an intramuscular tendon in the thickness of the gluteus medius was constantly prooved in 40 muscles. The relations of the intrinsic fibrous structure of the muscle and its innervation were studied. The authors deduce from that the topography of a gluteus medius incision, with respect to a safety area towards its innervation, which leads to an exposure of the acetabulum that is satisfying and gives opportunities of a sound repair after the surgery of the hip joint through the transgluteal approach. They propose the “anterior hemimyotomy of the gluteus medius m” designation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00276-997-0061-3
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Anatomic basis of the transgluteal approach to the hip-joint by anterior hemimyotomy of the gluteus medius (1997)
    Springer
    Surgical and radiologic anatomy 19 (1997), S. 61-67 
    Details
    ISSN: 1279-8517
    Keywords: Anatomy ; Hip arthroplasty ; Transgluteal approach
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Les auteurs présentent une étude de l'anatomie intrinsèque du m. moyen fessier (MF) et de son innervation par le rameau caudal du n. glutéal supérieur (NGS). 40 muscles ont été étudiés. L'existence d'une lame tendineuse dans l'épaisseur du MF a été constamment mise en évidence. Les rapports entre les éléments de l'architecture fibreuse intrinsèque du muscle et son innervation ont été étudiés. Les auteurs en déduisent la topographie d'une incision du MF respectant une zone de sécurité vis à vis de son innervation, procurant une exposition acétabulaire satisfaisante et des possibilités de réparation solide après chirurgie de l'articulation coxo-fémorale par voie d'abord transglutéale, et proposent la dénomination “hémimyotomie antérieure du MF”.
    Notes: Abstract The authors present a study of the intrinsic anatomy of the gluteus medius m. and of its innervation through the caudal branch of the superior gluteal n. The existence of an intramuscular tendon in the thickness of the gluteus medius was constantly prooved in 40 muscles. The relations of the intrinsic fibrous structure of the muscle and its innervation were studied. The authors deduce from that the topography of a gluteus medius incision, with respect to a safety area towards its innervation, which leads to an exposure of the acetabulum that is satisfying and gives opportunities of a sound repair after the surgery of the hip joint through the transgluteal approach. They propose the “anterior hemimyotomy of the gluteus medius m” designation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01628125
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Toxicological analysis in agitated patients (1999)
    Springer
    Intensive care medicine 25 (1999), S. 852-854 
    Details
    ISSN: 1432-1238
    Keywords: Key words Agitated patients ; Mass spectrometry ; Benzodiazepine ; Alcohol ; Selective serotonin reuptake inhibitor ; Emergency department
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Objective: To assess the toxicological etiologies in agitated patients and to evaluate their initial clinical diagnosis in the light of toxicological results analysis. Design: Prospective clinical study. Setting: Emergency Department (ED) in a 2,650-bed University Hospital. Patients: Fifty-eight consecutively enrolled patients admitted to the ED in agitated states over a 6-month period. Measurements and results: All patients underwent laboratory tests including blood glucose, ethanol and serum drug screening. Toxicology tests were conducted by fluorescence polarization immunoassay and confirmed by high performance liquid chromatography/diode array detector and gas chromatography-mass spectrometry. The physician's initial diagnosis was evaluated in the light of toxicological analysis results. Serum toxicological analysis revealed that 50/58 patients were under the influence of alcohol and/or a drug. Benzodiazepines (22/58), selective serotonin reuptake inhibitors (5/58) and opiates (4/58) were the most frequently observed. The initial clinical diagnosis was alcohol intoxication in 39 patients, although 1 patient was not under the influence of alcohol and 16 also had benzodiazepine in their sera. Moreover, the diagnosis of serotonin syndrome was overlooked in two patients. Conclusion: Most agitated patients were under the influence of alcohol and/or a drug. Benzodiazepine alone or in association with alcohol was surprisingly frequent. A serotonin syndrome may explain the agitation state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001340050964
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    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Lorazepam impairs perceptual integration of visual forms: a central effect (1996)
    Springer
    Psychopharmacology 126 (1996), S. 260-270 
    Details
    ISSN: 1432-2072
    Keywords: Benzodiazepine ; Lorazepam ; Human ; Visual perception ; Oculomotor balance ; Integration processes ; Symmetry perception
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Previous studies have shown a lorazepam effect on visual perception. We tested whether this impairment resulted from a peripheral effect induced by benzodiazepines. A first experiment showed that a single dose of lorazepam induces an oculomotor imbalance without impairing visual acuity or accommodation. In a second experiment, we tested whether the impairment induced by lorazepam on visual perception still occurred in monocular vision. Subjects matched incomplete forms controlled on the spacing and alignment of their local contour elements. A reference object was first displayed and followed by two laterally displayed objects, a target and a distractor. The distractor was the mirror-reversed version of the target. Performance was impaired in the lorazepam group when the reference was an incomplete form with a spacing of 10.8' or 22.2' of arc. These results were not correlated with sedation. They confirm that lorazepam has a central deleterious effect on visual perception. A posthoc analysis also suggested that lorazepam-treated subjects used asymmetry in the stimuli as a compensatory strategy. This result is discussed in relation to previous hypotheses about the physiological mechanisms that determine the effects of lorazepam on visual perception.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02246456
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Shear rheology of polymer solutions near the critical condition for elastic instability (1997)
    Springer
    Rheologica acta 36 (1997), S. 97-109 
    Details
    ISSN: 1435-1528
    Keywords: Polymer migration ; anomalous theology ; Boger fluid ; normal stress ; elastic instability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract The use of constant viscosity, highly elastic polymer solutions, so called Boger fluids, has been remarkably successful in elucidating the behavior of polymeric materials under flowing conditions. However, the behavior of these fluids is still complicated by many different physical processes occurring within a narrow window of observation time and applied shear rate. In this study, we investigate the long-time shear behavior of an ideal Boger fluid: a well characterized, athermal, dilute, binary solution of high molecular weight polystyrene in oligomeric polystyrene. Rheological measurements show that under an applied steady shear flow, this family of polymer solutions undergoes a transient decay of normal stresses on a timescale much longer than the polymer molecule's relaxation time. Rheological and flow visualization results demonstrate that the observed phenomenon is not caused by polymer degradation, phase separation, viscous heating, or secondary flows from elastic instabilities. Although the timescale is much shorter than that associated with polymer migration in the same solutions (MacDonald and Muller, 1996), the appearance of this phenomenon only at the rates where migration has been observed suggests that it may be a prerequisite for observing migration. In addition, we note that through sufficient preshearing of the sample, the normal stress decrease suppresses the elastic instability. These results show that there is considerable uncertainty in choosing the appropriate measure of the fluid relaxation time for consistently modeling the critical condition for the elastic instability, the decay of normal stresses, and the migration of polymer species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00366816
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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