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  • 1
    Electronic Resource
    Electronic Resource
    Synaptic Neurochemistry of Human Striatum During Development: Changes in Sudden Infant Death Syndrome (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 60 (1993), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: There is evidence of abnormalities in the brain-stem monoamine-containing neurons in infants with sudden infant death syndrome (SIDS). By taking advantage of the rich innervation of the human basal ganglia by monoam-inergic afferents from cell bodies in the brainstem, we studied the synaptic chemistry of catecholamine and associated neurons of the putamen obtained postmortem from 14 SIDS infants, eight age-matched control infants, and older control subjects of various ages. We found significantly lower concentrations of dopamine and higher homovanillic acid/DA ratios in samples from SIDS infants compared with age-matched control infants. Noradrenaline and 5-hydroxytryptamine were lower in SIDS compared with control subjects, but the difference did not reach statistical significance. There was no clear evidence that dihydroxyphe-nylacetic acid and 5-hydroxyindoleacetic acid were altered. Immunoblot analysis of striatal tissue showed that samples from infants with SIDS, which exhibited lower DA, also had lower tyrosine hydroxylase protein. Other transmitter-specific neuronal markers were also assessed, including enzymes associated with cholinergic and GABA-containing neurons. We found significantly decreased choline acetyltransferase activities. However, GABA, glutamate, or somatostatin concentrations or monoamine oxidase activities were unchanged in SIDS. We also noted age-dependent changes in brain weights and some synaptic markers by comparing the age-matched infants with older control subjects. Analysis of variance revealed that homovanillic acid, dihydroxyphenylacetic acid, and monoamine oxidase B activities were increased with age. DA and choline acetyltransferase were also found to be positively correlated in putamen. Our findings suggest developmental changes in some transmitter-specific neurons in SIDS that may result from apneic episodes or chronic hypoxia induced before death.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-4159.1993.tb03494.x
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  • 2
    Electronic Resource
    Electronic Resource
    Separation of thermal wave induced displacements and thermoreflectance variations using a rotated beamsplitter cube interferometer (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 3853-3859 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A rotated beamsplitter cube interferometer has been developed which can measure both the change in reflectivity and the displacement of nontransparent thin films caused by thermal waves. Thermal waves are used to characterize material properties, especially those of thin films, by monitoring the heat propagation in a specimen. Thermal waves cause both a change in the reflectivity of the specimen and a displacement of the specimen surface. By varying the phase difference between the reference and signal arms of an interferometer, a method for detecting and separating the contributions of each of these effects has been developed. This enables the determination of the thermal expansion coefficient of the thin film independent of substrate properties. Data demonstrating the application of this technique on Cu and TiN thin films are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1289677
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  • 3
    Electronic Resource
    Electronic Resource
    Backscattering of projectile-bound electrons from solid surfaces
    Amsterdam : Elsevier
    Nuclear Inst. and Methods in Physics Research, B 86 (1994), S. 143-146 
    Details
    ISSN: 0168-583X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0168-583X(94)96162-X
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  • 4
    Electronic Resource
    Electronic Resource
    Deviation of the binary encounter electron energy from simple conservation laws in ion-atom and in ion-solid collisions
    Amsterdam : Elsevier
    Nuclear Inst. and Methods in Physics Research, B 93 (1994), S. 142-148 
    Details
    ISSN: 0168-583X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0168-583X(94)95679-0
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  • 5
    Electronic Resource
    Electronic Resource
    Charge state analysis of heavy ions after penetration of uncleaned and sputter cleaned conducting surfaces
    Amsterdam : Elsevier
    Nuclear Inst. and Methods in Physics Research, B 86 (1994), S. 194-196 
    Details
    ISSN: 0168-583X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0168-583X(94)96175-1
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  • 6
    Electronic Resource
    Electronic Resource
    Das primäre Non-Hodgkin-Lymphom des Pankreas (1998)
    Springer
    Der Chirurg 69 (1998), S. 301-305 
    Details
    ISSN: 1433-0385
    Keywords: Key words: Non-Hodgkin lymphoma ; Pancreas ; Pancreatic tumors ; Differential diagnosis ; Case report. ; Schlüsselwörter: Non-Hodgkin-Lymphom ; Pankreas ; Pankreastumoren ; Differentialdiagnose ; Kasuistik.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung. Bei einem 71 jährigen Patienten mit einem seit 8 Wochen bestehenden schmerzlosen Verschlußikterus war sonographisch und computertomographisch eine 7 × 6 cm große Raumforderung im Bereich des Pankreaskopfes nachweisbar, die in Zusammenhang mit einem CA 19–9 von 329 U/l hochgradig verdächtig auf ein Pankreascarcinom war. Nach endoskopischer Einlage einer Pigtail-Drainage in den mit 2,7 cm deutlich dilatierten Ductus hepatocholedochus (DHC) machte eine anhaltende kreislaufwirksame Blutung aus dem DHC eine notfallmäßige partielle Duodenopankreatektomie nach Whipple erforderlich. Die histopathologische Untersuchung ergab ein sklerosierendes folliculäres centroblastisch-centrocytisches Lymphom i. S. eines niedrig malignen Non-Hodgkin-Lymphoms (NHL) des B-Zell-Systems. Eine sichere Abgrenzung des primären NHL des Pankreas zum Pankreascarcinom ist weder klinisch noch durch laborchemische oder bildgebende Verfahren sicher möglich. Die Impression des Ductus pancreaticus ohne Infiltration bei relativ großen Tumorprozessen sollte an eine extranodale Manifestation eines NHL denken lassen und eine histologische Abklärung herbeiführen.
    Notes: Summary. A 71-year-old patient had been suffering from pain-free obstructive jaundice for 8 weeks. Ultrasonography and computed tomography revealed an inhomogeneous mass (diameter 7 × 6 cm) in the head of the pancreas. In combination with a CA 19–9 of 329 U/l, the findings were highly suggestive of a pancreatic carcinoma. Endoscopic implantation of a pigtail drain into the dilated choledochal duct was performed. A partial duodenopancreatectomy (Whipple's procedure) became necessary because of continuous bleeding with hemodynamic disorders after endoscopic papillotomy. In the histopathological examination a low-grade malignant non-Hodgkin lymphoma of the pancreas (follicular centroblastic-centrocytic) was diagnosed. The differential diagnosis of primary pancreatic lymphoma from pancreatic carcinoma is usually impossible. Neither clinical nor laboratory nor imaging methods indicate to the correct diagnosis. In cases of relatively large pancreatic tumor masses and impression of the pancreatic duct without infiltration, a primary pancreatic lymphoma should be considered and a histological diagnosis by biopsy should be performed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001040050417
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  • 7
    Electronic Resource
    Electronic Resource
    Analytical approximate 3D solution for the longitudinally vibrating cylinder (1996)
    Springer
    Archive of applied mechanics 66 (1996), S. 447-459 
    Details
    ISSN: 1432-0681
    Keywords: Key words: analytical approximate ; solution ; thick cylinder ; axial loading ; time-harmonic behavior
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary The paper presents a three-dimensional approximate solution of a longitudinally vibrating cylinder. It is based on the frequency equation for free waves travelling along an infinitely long cylinder which follows from the radial boundary condition on the lateral surface of the cylinder. An equivalent longitudinal traction is calculated by integration of the normal stresses over the end cross section. The full solution of the longitudinally vibrating rod adapted to given axial boundary conditions is derived. The solution is compared to numerical results, and good agreement is obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00790178
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  • 8
    Electronic Resource
    Electronic Resource
    Regularized computation of interior displacements and stresses by BEM (1994)
    Springer
    Archive of applied mechanics 65 (1994), S. 2-12 
    Details
    ISSN: 1432-0681
    Keywords: Boundary element method ; regularization ; stress analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary The computation of interior displacements and stresses with the boundary element method (BEM) often requires the evaluation of nearly singular integrals. These integrals arise from the singular behaviour of the kernel functions in the Somigliana identity and the Somigliana stress identity. Treating them numerically in a standard way leads to inaccuracy near the boundary. This effect is always present in the calculation of field variables near the boundary and is called ‘boundary layer effect’. In this paper regularization procedures are proposed which consist of an indirect evaluation of singular integrals and a special coordinate transformation. The proposed procedures eliminate the boundary layer effect for both, the calculation of displacements and stresses. In a numerical example of elastostatics the developed strategies are shown to work. Due to the generality of the proposed procedures they can be extended to any standard boundary element formulation for problems with bounded domains.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00788889
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  • 9
    Electronic Resource
    Electronic Resource
    Pancreas anulare als seltene Differentialdiagnose der Duodenalstenose im Erwachsenenalter (1997)
    Springer
    Langenbeck's archives of surgery 382 (1997), S. 307-310 
    Details
    ISSN: 1435-2451
    Keywords: Key words Annular pancreas ; Pancreas ; Congenital anomaly ; Duodenal obstruction ; Case report ; Schlüsselwörter Pancreas anulare ; Pankreas ; Kongenitale Anomalie ; Duodenalstenose ; Kasuistik
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Das Pancreas anulare ist eine seltene kongenitale Anomalie des Pankreas, welche in der Hälfte der Fälle erst im Erwachsenenalter symptomtisch wird. Wir berichten über einen 52jährigen Patienten mit einer subtotalen Duodenal- und Pylorusstenose, bei dem eine partielle Duodenopankreatektomie nach Whipple durchgeführt wurde. Die Histologie ergab ein Pancreas anulare, wobei die entzündlichen Komplikationen dieser Fehlbildung mit tryptischer Sialadenitis des Caput pancreatis zu einer zusätzlichen Stenose geführt haben. Bei der Duodenalstenose des Erwachsenen sollte das Pancreas anulare in die Differentialdiagnose einbezogen werden. Obwohl die endoskopisch retrograde Cholangiopankreatikographie (ERCP) das diagnostische Mittel der Wahl darstellt und in Kombination mit der Computertomographie (CT) die Diagnose präoperativ in vielen Fällen möglich ist, kann ein Pancreas anulare derzeit teilweise erst intraoperativ diagnostiziert werden, insbesondere wenn entzündliche Pseudotumoren vorliegen oder eine subtotale Stenosierung die ERCP unmöglich macht.
    Notes: Abstract Annular pancreas is a rare congenital malformation of the pancreas. In about 50% of the cases the malformation is asymptomatic until the third to fifth decade. We report on a 52-year-old male patient who presented with subtotal duodenal and gastric outlet stenosis. Duodenohemipancreatectomy (Whipple's procedure) was performed. The histological examination showed an annular pancreas with complicating inflammatory reactions (tryptic sialadenitis) of the pancreatic head causing additional obstruction. Annular pancreas should be taken into account as a possible cause of adult duodenal obstruction. Endoscopic retrograde cholangiopancreatography (ERCP) is the diagnostic modality of choice, and in combination with computed tomography the diagnosis can be obtained preoperatively in many patients. However, there are still patients in whom the diagnosis can finally be obtained only intraoperatively especially in cases where inflammatory pseudotumors or subtotal duodenal stenosis make ERCP impossible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00008061
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  • 10
    Electronic Resource
    Electronic Resource
    Pancreas anulare als seltene Differentialdiagnose der Duodenalstenose im Erwachsenenalter (1997)
    Springer
    Langenbeck's archives of surgery 382 (1997), S. 307-310 
    Details
    ISSN: 1435-2451
    Keywords: Annular pancreas ; Pancreas ; Congenital anomaly ; Duodenal obstruction ; Case report ; Pancreas anulare ; Pankreas ; Kongenitale Anomalie ; Duodenalstenose ; Kasuistik
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Das Pancreas anulare ist eine seltene kongenitale Anomalie des Pankreas, welche in der Hälfte der Fälle erst im Erwachsenenalter symptomtisch wird. Wir berichten über einen 52jährigen Patienten mit einer subtotalen Duodenal- und Pylorusstenose, bei dem eine partielle Duodenopankreatektomie nach Whipple durchgeführt wurde. Die Histologie ergab ein Pancreas anulare, wobei die entzündlichen Komplikationen dieser Fehlbildung mit tryptischer Sialadenitis des Caput pancreatis zu einer zusätzlichen Stenose geführt haben. Bei der Duodenalstenose des Erwachsenen sollte das Pancreas anulare in die Differentialdiagnose einbezogen werden. Obwohl die endoskopisch retrograde Cholangiopankreatikographie (ERCP) das diagnostische Mittel der Wahl darstellt und in Kombination mit der Computertomographie (CT) die Diagnose präoperativ in vielen Fällen möglich ist, kann ein Pancreas anulare derzeit teilweise erst intraoperativ diagnostiziert werden, insbesondere wenn entzündliche Pseudotumoren vorliegen oder eine subtotale Stenosierung die ERCP unmöglich macht.
    Notes: Abstract Annular pancreas is a rare congenital malformation of the pancreas. In about 50% of the cases the malformation is asymptomatic until the third to fifth decade. We report on a 52-year-old male patient who presented with subtotal duodenal and gastric outlet stenosis. Duodenohemipancreatectomy (Whipple's procedure) was performed. The histological examination showed an annular pancreas with complicating inflammatory reactions (tryptic sialadenitis) of the pancreatic head causing additional obstruction. Annular pancreas should be taken into account as a possible cause of adult duodenal obstruction. Endoscopic retrograde cholangiopancreatography (ERCP) is the diagnostic modality of choice, and in combination with computed tomography the diagnosis can be obtained preoperatively in many patients. However, there are still patients in whom the diagnosis can finally be obtained only intraoperatively especially in cases where inflammatory pseudotumors or subtotal duodenal stenosis make ERCP impossible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02386615
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