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  • Electronic Resource  (7)
  • 1990-1994  (3)
  • 1985-1989  (4)
  • Chemistry  (5)
  • Cancer
  • Carotid stenosis
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Surgical and radiologic anatomy 10 (1988), S. 121-135 
    ISSN: 1279-8517
    Keywords: Pancreas ; Lymphatic system ; Cancer ; Macroscopic anatomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Une étude détaillée du drainage lymphatique du pancréas a été effectuée afin de poser les bases théoriques d'un curage lymphatique idéal dans la chirurgie d'exérèse du cancer. Une dissection minutieuse des lymphatiques a permis d'obtenir le résultat suivant. Trois voies de drainage principales ont été identifiées: la voie supérieure appartient à la chaîne hépatique commune, les voies moyenne et inférieure rejoignent le groupe ganglionnaire mésentérique supérieur. Tous ces drainages se terminent dans un nœud lymphatique situé à droite de l'origine du tronc cœliaque et de l'artère mésentérique supérieure. Les lymphatiques provenant du col du pancréas convergent également vers le même nœud. Derrière celui-ci existe un autre lymphonœud où se terminent les lymphatiques provenant de la face postérieure de la tête. Ces 2 nœuds adhèrent intimement l'un à l'autre, séparés seulement par le plexus nerveux de la tête du pancréas. Dans ce travail, nous avons utilisé pour ces nœuds les termes de lymphonœud cœliaco-mésentérique droit superficiel et profond. Deux voies de drainage distinctes ont été identifiées au niveau de la moitié gauche du pancréas. L'une longe les vaisseaux spléniques et l'autre accompagne l'artère pancréatique inférieure. Par ces 2 voies différentes les lymphatiques de la moitié gauche du pancréas se terminent dans un nœud situé à gauche de l'origine du tronc cœliaque et de l'artère mésentérique supérieure. Nous l'avons appelé le lymphonœud cœliaco-mésentérique gauche. A partir de ces relais lymphatiques situés de part et d'autre de l'origine des deux artères, des vaisseaux efférents se dirigent vers les nœuds juxta-aortiques: du côté droit, les lymphatiques efférents rejoignent les nœuds inter-aortico-veineux situés au-dessus et en dessous de l'abouchement de la veine rénale gauche dans la veine cave inférieure; du côté gauche ils rejoignent les nœuds latéro-aortiques gauches situés au-dessus et en dessous de la veine rénale gauche; à partir de ces relais les voies efférentes rejoignent l'espace rétro-aortique où elles forment un courant lymphatique ascendant. Notre travail n'a pas permis de découvrir des vaisseaux lymphatiques communiquant avec le système rétro-aortique au-dessus du niveau des artères rénales.
    Notes: Summary A detailed study of the lymphatics around the pancreas was carried out in order to provide a theoretic basis for ideal lymph-node resection in radical cancer operations. The following results were obtained as a result of minute macroscopic dissection of the lymphatics. Three major pathways are identified on the anterior surface of the head of the pancreas. The upper pathway belongs to the common hepatic group. The middle and lower routes are associated with the superior mesenteric nodal group. All these pathways terminate in the node situated to the right of the origins of the celiac trunk and the superior mesenteric artery. The lymphatics arising from the neck of the pancreas also converge at the same node. Behind this node, there is a terminal node for the lymphatics which arise from the posterior surface of the head. Both nodes are firmly adherent, with only the nerve plexus of the head of the pancreas intervening. In this study, we have named these lymph-nodes Lnn celiacomesenterici dextri superficialis et profundi. Two distinct pathways are identified in the left half of the pancreas. One follows the splenic blood vessels and the other accompanies the inferior pancreatic artery. By way of these routes, lymphatics from the left half of the pancreas terminate in the node situated to the left of the origins of the celiac trunk and superior mesenteric artery. We have applied the term Ln celiacomesentericus sinister to this node. From these lymphatic terminalis on both sides of the origins of the two arteries, efferent vessels are sent to the abdominoaortic nodes: on the right side, efferents reach the inter-aorticovenous nodes lying in the upper and lower angles formed by the inferior vena cava and the left renal vein; and on the left side, they arrive at the left latero-aortic nodes lying above and below the left renal vein. The efferents of these nodes then extend to the retro-aortic space, where they compose an ascending lymphatic system. Our study revealed no lymphatic vessels communicating with the retro-aortic system at levels above the renal arteries.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1920
    Keywords: Reversible ischaemic attacks ; Positron tomography ; Cerebral blood flow ; Cerebral blood volume ; Cerebral oxygen metabolism ; Carotid stenosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Regional cerebral blood flow (CBF), blood volume (CBV) and oxygen metabolic rate (CMRO2) were evaluated and compared among normals, patients with recent reversible ischaemic attacks (RIAs) and patients with chronic minor infarction using positron emission tomography. Average CBF together with CMRO2 significantly decreased in the infarction group in the middle cerebral artery territory of the affected hemisphere while the mean values for RIAs were intermediate between the other two groups. CBV also reduced, however it was more preserved compared to flow as seen in decreased CBF/CBV values. Significant interhemispheric difference was found in CBF/CBV ratio, but it did not clearly correlate with OEF changes. Higher OEF was noted only in the restricted brain regions of RIAs where CBF showed large hemispheric asymmetry. However, in other regions, the coupled decline of blood flow and metabolism was found which suggests tissue damage or neuronal cell loss in the brain with previous RIA symptoms.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 26 (1988), S. 2839-2847 
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: In Auger electron spectroscopy, the relative sensitivities of elements, which are widely used in quantitative analysis, are primarily obtained by measurement. Nevertheless, it is very tedious to collect all relative elemental sensitivity factors for different primary electron beam energies. In view of this, we have examined methods of deriving the relative sensitivity factor for an arbitrary electron beam energy from one experimental value determined at a set energy. For this calculation, we have to consider the contributions of the ionization cross-section and the electron backscattering factor. Several formulas for the ionization cross-section and the backscattering correction factor have been reported. We have performed experiments to examine their correction accuracy. It was found that when Gryziński's formula is used as the ionization cross-section and Love-Scott's formula as the backscattering correction factor, the difference between calculated sensitivity values and measured values was found to be 〈15% for excitation energies of 〈20 keV.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Brookfield, Conn. : Wiley-Blackwell
    Polymer Composites 15 (1994), S. 327-333 
    ISSN: 0272-8397
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The results of studies on bending properties of three-layer long fiber polypropylene composites are presented. Thirteen samples with glass fibers of various lengths (i.e., 13, 25, 50 mm and continuous fiber length) in the laminates were prepared by stamping. Bending properties of shorter lengths exhibited a large scatter. On substitution of the middle layer with a continuous glass fiber the scatter was reduced. These results have been explained on the basis of flow models and X-ray shadowgraphs, which showed that both slippage flow and orientation of the glass fiber during stamping are the major phenomena responsible for the scatter.
    Additional Material: 18 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Brookfield, Conn. : Wiley-Blackwell
    Polymer Composites 15 (1994), S. 393-400 
    ISSN: 0272-8397
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The effect of die design on the flow characteristics of compression molded three-layer long glass fiber reinforced polypropylene composite, known as “stampable sheet,” was investigated. The flow behavior of each layer was observed by optical and soft X-ray photographs. The fiber flow length into the rib part was measured by an image processing system. The results showed that during compression resin exudation occurred and that this depended on the die's rib width. Thus, the larger the rib width, the lower the amount of resin exuded. Resin exudation was found to occur earlier in a die with zero fillet radius. The fiber flow length into the rib part was enhanced by using a die with a large fillet radius. The results were confirmed by a short-shot molding process. In this process, the stamping operation was stopped short of making a complete part.A finite element method was used to study the flow process. The results agree with the experimental results confirmed by short-shot molding.
    Additional Material: 18 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 45 (1994), S. 399-412 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A statistical mechanical theory is presented for liquid-crystalline polymer solutions, where the liquid-crystalline polymer is regarded as a wormlike spherocylinder interacting by the hard-core repulsion and a soft (attractive or electrostatic) interaction with other spherocylinders. The theory is based on the following two assumptions: (1) the intramolecular excluded volume effect is not effective and (2) the interaction between pair of spherocylinders can be treated by the “single contact approximation”. These assumptions are relevant to a polymer with a stiff backbone and not very long contour length. The theory is used to predict thermodynamic and spatial properties of isotropic solutions and also isotropic-liquid crystal phase equilibrium behavior. The predicted solution properties and phase behavior are favorably compared with experimental results for some selected stiff-chain liquid-crystalline polymers.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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