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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    European radiology 10 (2000), S. 802-805 
    ISSN: 1432-1084
    Keywords: Key words: Gastrointestinal bleeding ; Embolization ; Interventional therapy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. Retrospective evaluation of interventional embolization therapy in the treatment of gastrointestinal hemorrhage over a long-term observation period from 1989 to 1997. Included in the study were 35 patients (age range 18–89 years) with gastrointestinal bleeding (GI) referred for radiological intervention either primarily or following unsuccessful endoscopy or surgery. Sources of GI bleeding included gastric and duodenal ulcers (n = 7), diverticula (n = 3), erosion of the intestinal wall secondary to malignancy (n = 6), vascular malformations (n = 4), and hemorrhoids (n = 2), as well as from postoperative (n = 6), posttraumatic (n = 2), postinflammatory (n = 4) or unknown (n = 1) causes. Ethibloc (12 cases) or metal coils (14 cases) were predominantly used as embolisates. In addition, combinations of tissue adhesive and gelfoam particles and of coils and Ethibloc were used (six cases). Finally, polyvinyl alcohol particles, a coated stent, and an arterial wire dissection were utilized in one case each. Bleeding was stopped completely in 29 of 35 cases (83 %). In one case (3 %) the source of bleeding was recognized but the corresponding vessel could not be catheterized. In five other cases (14 %) there was partial success with reduced, though still persistent, bleeding. The rate of complications was 14 %, including four instances of intestinal ischemia with fatal outcome in the first years, and, later, one partial infarction of the spleen without serious consequences. Gastrointestinal hemorrhage can be controlled in a high percentage of patients, including the seriously ill and those who had previously undergone surgery, with the use of minimally invasive interventional techniques. The availability of minicoils instead of fluid embolization agents has reduced the risk of serious complications.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Adolescence 3 (1980), S. 165-173 
    ISSN: 0140-1971
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Medicine , Psychology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Adolescence 5 (1982), S. 51-62 
    ISSN: 0140-1971
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Medicine , Psychology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Behavior Therapy and Experimental Psychiatry 6 (1975), S. 171-173 
    ISSN: 0005-7916
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Psychology
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 2324-2326 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Asymmetrically confined multiple quantum well laser structures have recently been very successful in reaching high modulation bandwidths up to 26 GHz, reported in the InGaAs/InGaAlAs material system. We have measured the effective carrier transport time in structures of this kind by performing parasitic-free optical modulation experiments. The result is one specific transport time for each confinement layer width. We show that down to layer widths of about 100 nm this effective time for both types of carriers is given by a pure diffusion process for InGaAs/InGaAlAs. Finally, a diffusion constant for the barrier/confinement carriers results in InGaAlAs material which is in very good agreement with reported mobilities. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 6
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    Unknown
    London : Periodicals Archive Online (PAO)
    Journal of adolescence. 3:2 (1980:June) 165 
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  • 7
    facet.materialart.
    Unknown
    London : Periodicals Archive Online (PAO)
    Journal of adolescence. 5:1 (1982:Mar.) 51 
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Journal of sol gel science and technology 13 (1998), S. 673-678 
    ISSN: 1573-4846
    Keywords: electrochromism ; sol-gel ; tungsten oxide ; peroxotungstic acid ; nanocrystalline
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Stable tungsten oxide coating sols suitable for electrochromic applications were prepared by a modified peroxotungstic acid route. Layers up to 250 nm thickness could be deposited on ITO-coated and/or FTO-coated glass substrates in a single dip-coating process. Optoelectrochemical measurements were employed to determine the variation of the electrochromic properties (change in optical density (ΔOD) and switching times) of WO3-layers, investigated as a function of coating parameters, such as chamber humidity and the temperature of heat treatment. High resolution transmission electron microscopy (HR-TEM) has shown that the optimized layers possess a partially crystalline morphology with nanocrystalline regions 2–3 nm in size.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Der Chirurg 68 (1997), S. 201-209 
    ISSN: 1433-0385
    Keywords: Key words: Diagnostic laparoscopy ; Laparoscopic ultrasonography ; Tumor staging ; Gastrointestinal malignancies. ; Schlüsselwörter: Diagnostische Laparoskopie ; laparoskopische Sonographie ; Tumorstaging ; gastrointestinale Malignome.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung. Die sog. erweiterte diagnostische Laparoskopie (EDL) ist ein minimal-invasiver chirurgischer Eingriff, der die Exploration des gesamten Bauchraumes ermöglicht, und somit das prätherapeutische Staging bei malignen Erkrankungen erheblich verbessern kann. Die EDL umfaßt die visuelle Inspektion mit gezielter Präparation aller relevanten Areale, die laparoskopische Ultraschalldiagnostik und die Gewinnung von Cytologie-Biopsiematerial. Beim Magencarcinom konnte, in einer eigenen Studie, durch die EDL in 40,5 % der Fälle therapierelevante Zusatzinformationen gewonnen werden. Eine ähnliche Bedeutung könnte die EDL auch für die Diagnostik des Adenocarcinoms der Speiseröhre gewinnen, möglicherweise auch bei Malignomen von Leber und Pankreas. Das Komplikationsrisiko der EDL ist gering; die Gefahr einer Tumorzellverschleppung durch den diagnostischen Eingriff ist jedoch nicht ganz auszuschließen, so daß die Indikation nur unter der Voraussetzung einer therapeutischen Konsequenz gestellt werden sollte.
    Notes: Summary. The so-called extended diagnostic laparoscopy (EDL) facilitates the comprehensive exploration of the abdominal cavity, thus improving the precision of the pretherapeutic tumor staging in gastrointestinal malignancies. EDL comprises visual inspection with a specific preparation of all relevant sites, laparoscopic sonography and retrieval of samples for biopsy and cytology. Additional relevant therapeutic information was obtained through EDL in 40.5 % of gastric cancer patients. EDL could be of similar importance for diagnosing esophageal, hepatobiliary and pancreatic malignancies.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1432-1440
    Keywords: Arterial Hypertension, structural changes ; Arteriolar hypertrophy and hyperplasia ; Na+/Li+-exchange ; Na+/H+-antiport ; Phosphatidylinositol metabolism ; Growth factors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The most common haemodynamic abnormality in human essential hypertension is an increase in systemic vascular resistance. Morphologic substrate for increased flow resistance is a narrowing of the lumen of arteriolar resistance vessels. During the course of essential hypertension, this is associated with an increase in wall (mainly media) thickness due to hypertrophy and hyperplasia of vascular smooth muscle cells. In contrast to concepts interpreting media thickening strictly as structural adaptation to increased perfusion pressure, various lines of evidence also point to pressure independent factors. In this context, extracellular factors such as “growth factors” as well as alterations in the activity of intracellular messenger systems must be considered. Recent studies suggest that substances generally known to act as vasoconstrictors such as angiotensin II, noradrenaline and arginine-vasopressin may also stimulate vascular smooth muscle cell growth and proliferation. Intracellular messenger systems with possible significance in the response to trophins and/or mitogens of vascular smooth muscle cells are phospholipase C, protein kinase C and the Na+/H+-antiport. These systems have been demonstrated to be altered in hypertension supporting the concept that one endogenous factor in human essential hypertension with pathophysiological significance, at least in a subgroup of patients, may be an enhanced reactivity of vascular smooth muscle cells to trophic and mitogenic stimuli. In this context, intracellular messenger systems such as phospholipase C, protein kinase C and/or the Na+/H+-antiport may play an important pathophysiological role.
    Type of Medium: Electronic Resource
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