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  • 1970-1974  (1)
  • 1965-1969  (15)
  • 1920-1924  (2)
  • 1
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    Berlin : Periodicals Archive Online (PAO)
    Orientalistische Literaturzeitung. 60:7/8 (1965:Juli/Aug.) 387 
    ISSN: 0030-5383
    Topics: Linguistics and Literary Studies , Ethnic Sciences , History
    Notes: Besprechungen
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  • 2
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    Berlin : Periodicals Archive Online (PAO)
    Orientalistische Literaturzeitung. 61:3/4 (1966:März/Apr.) 166 
    ISSN: 0030-5383
    Topics: Linguistics and Literary Studies , Ethnic Sciences , History
    Notes: Besprechungen
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  • 3
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    Berlin : Periodicals Archive Online (PAO)
    Orientalistische Literaturzeitung. 66:1/2 (1971:Jan./Feb.) 69 
    ISSN: 0030-5383
    Topics: Linguistics and Literary Studies , Ethnic Sciences , History
    Notes: Besprechungen
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 53 (1966), S. 614-614 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-2307
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Proteolytic enzyme activities in acute autodigestive pancreatitis were demonstrated histochemically by a modified “fibrinolysis autograph” technique, a substrate-film method used to localize plasminogen activators and proactivators in cryostat sections. In the “olive-oil pancreatitis” of the dog proteolytic enzymes released from acini and lobuli by necrobiosis diffused into the substrate films during incubation and produced sharply defined, punched out areas of lysis in the overlying films by liquefying the bovine fibrin. The proteolytic digestion of the substrate differed from perivascular (near endothelial cells) plasmin-induced fibrinolysis by its relationship to areas of “quasi-specific, tryptic necrosis” of the parenchyma. The proteolytic substrate-film digestion was absent over integer and completely necrotic, “exhausted” areas of the exocrine pancreas. The longer cryostat sections were incubated the more regions of proteolysis and fibrinolysis fused. After Ca++ was added the plasminogen activated fibrinolysis occurred more slowly because of the fibrin network formed. In contrast, non-specific proteolysis was not delayed over fresh regions of autodigestive parenchymal necrosis. The results indicate how important proteases released from tissues are in the pathogenesis of autodigestive pancreatitis.
    Notes: Zusammenfassung Mit einer Modifikation der Substratfilm-Methode der „fibrinolysis autographs“ zum histochemischen Nachweis gewebseigener Plasminogen-Aktivatoren und -Proaktivatoren läßt sich an Kryostat- Schnitten die bei der akuten autodigestiven Pankreatitis auftretende proteolytische Enzymaktivität histochemisch demonstrieren. Fibrinfilme als Substrate der bei der Pankreatitis freiwerdenden Proteasen zeigen bei der experimentellen „Olivenöl-Pankreatitis“ des Hundes über frisch der Nekrobiose unterworfenen Acini und Lobuli scharf umschriebene, ausgestanzte Lyseareale. Dagegen fehlt über integeren und vollständig nekrotischen, „ausgebrannten“ Parenchymbezirken die proteolytische Substratfilm-Aufhellung. Die initiale proteolytische Substratfilm-Andauung läßt sich von der perivasalen, d.h. an die Nachbarschaft von Endothelzellen gebundenen Fibrinolyse nach Aktivierung von Plasminogen zu Plasmin durch die gewebseigenen Aktivatoren aufgrund ihrer topochemischen Beziehung zu „quasispezifischen tryptischen Parenchymnekrosen“ abgrenzen. Bei längerer Schnitt-Inkubation dagegen konfluieren Proteolyse- und Fibrinolyse-Bezirke. Nach Ca++-Zusatz tritt die Plasminogen-bedingte Fibrinolyse infolge Fibrin-Vernetzung verzögert auf, die unspezifische Proteolyse über frischen autodigestiven Parenchymnekrobiosen wird nicht verzögert. Die Befunde beweisen die Bedeutung der im Gewebe freiwerdenden Proteasen für die Pathogenese der autodigestiven Pankreatitis.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1432-2013
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Bei akuten Änderungen der Nierendurchblutung und des Glomerulumfiltrates durch Ureterabklemmung, Aortendrosselung oder hämorrhagischer Hypotension wurde die Ammoniakproduktion und der Ammoniakdruck in der Hundeniere gemessen: 1. Bei Ureterabklemmung sinkt die Ammoniakproduktion parallel zum Glomerulumfiltrat ab, obwohl die Nierendurchblutung ansteigt und der P NH 3 abfällt. 2. Bei Durchblutungsminderung durch Aortendrosselung oder hämorrhagische Hypotension vermindern sich Glomerulumfiltrat und Ammoniakproduktion gleichsinnig. Der P NH 3 ist annähernd unverändert, da Ammoniakproduktion und Nierendurchblutung sich proportional verringern. Aus den Ergebnissen wird geschlossen, daß bei akuten Änderungen von Durchblutung und Glomerulumfiltrat die Ammoniakproduktion vom Verhalten des Glomerulumfiltrates und damit vom Substratangebot an die Tubuluszellen von der Lumenseite her bestimmt wird.
    Notes: Summary Production and partial pressure of ammonia in the dog kidney were measured before and after ureteric occlusion, hemorrhagic hypotension, and aortic constriction above the origin of the renal artery. During ureteric occlusion, the production of ammonia decreased proportionately to the reduction of GFR despite an increase in RBF and a decrease in renal P NH 3. The decrease of RBF and GFR observed during aortic constriction or hemorrhagic hypotension resulted in a fall of renal ammonia production. Under these conditions, renal P NH 3remained constant. The results indicate that renal ammonia production during acute alterations of RBF and GFR is predominantly dependent on GFR and, therefore, on the substrate supplied to the luminal membranes of the tubular cells.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-2013
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In order to test the applicability of the occlusion time method for measuring the reabsorptive characteristics in the proximal convolution of the rat kidney, a quantitative analysis of this method was performed. The time course of decrease in tubular diameter, following interruption of GFR, was measured from time sequenced photomicrographs taken before and during the period of occlusion. Tubular occlusion, as measured by direct microscopic observation or by extrapolating the initial slope of decrease in luminal diameter to zero diameter, was found to be constant over a range of GFR from 0.3–2.2 ml/min · g kidney weight. A positive correlation was observed between GFR and free flow luminal diameter. The decrease in luminal diameter, which occurs during the period of occlusion, is a linear function of time. The results indicate that the lateral water flux is directly related to the free flow luminal diameter prior to the period of occlusion, i.e., to GFR. In contrast, the lateral water flux remains constant during the decrease in luminal diameter, which occurs during the period of occlusion. Although the results are consistent with the assumption of a glomerular-tubular balance in the proximal convolution, the absolute values for lateral water flux, as measured by the occlusion method, are approximately twice as high as values calculated from free flow micropuncture experiments, split droplet experiments, and cinematographic experiments.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1432-2013
    Keywords: Hereditary Diabetes Insipidus ; Proximal Convolution ; Loops of Henle ; ADH ; Hereditärer Diabetes Insipidus ; Proximales Konvolut ; Henle'sche Schleife ; ADH
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Micropuncture studies were carried out on rats with hereditary hypothalamic diabetes insipidus, in order to measure net sodium and water reabsorption in proximal convolutions and short loops of Henle during water diuresis and ADH-induced antidiuresis. Intravenous infusion of 0.15 mU ADH per minute reduced urine flow from 74.5 μl per kidney per minute to 10.8 μl, and increased urine osmolality from 117 to 605 mOsm/kg. These changes could be reversed by stopping ADH. ADH did not alter the fractional reabsorption of fluid or the reabsorptive capacity for sodium in the proximal tubules. Nor did it change glomerular filtration rates of single superficial nephrons or of the entire kidney. Fractional reabsorption of the glomerular filtrate up to the early distal convolution was significantly higher (82.0%) in water diuresis than in antidiuresis (74.4%). Since this reabsorption remained unchanged in the proximal convolutions, the decreased reabsorption during antidiuresis must have occurred in the short loops. Fractional reabsorption of sodium up to the early distal tubule was essentially identical during water diuresis and antidiuresis, indicating that ADH does not enhance urinary concentration by increasing the reabsorption of sodium from short loops.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 46 (1968), S. 413-417 
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary The “unspecific-proteolytic” and “specific-fibrinolytic” activity in sediment and supernatent of leukocytic homogenates were examined in fibrinfree tube assays and on plasminogen-free heatdenatured and plasminogen-containing fibrin plates. Besides an unspecific proteolytic activity effective in the neutral pH-range a plasminogen activator activity was detected in the plasminogen-containing fibrin plates. This activator activity could not be inhibited by EACA in a concentration of 5 × 10−3 M. Leukocytic homogenates containing sediment as well as supernatant did not produce any plasminogen activator activity on plasminogen-containing fibrin plates. The investigations showed the existence of a bovine plasmin inhibitor in the leukocytic supernatant checking the “specific-fibrinolytic” activity of leukocytic sediment.
    Notes: Zusammenfassung In vergleichenden gerinnungsanalytischen und Reagensglasansätzen wurden die Sediment-Fraktion und die Überstand-Fraktion von Leukocyten-Homogenaten auf ihre „unspezifischproteolytische“ und „spezifisch-fibrinolytische“ Aktivität untersucht. Dabei fand sich in der Sediment-Fraktion neben einer im neutralen pH-Bereich wirksamen unspezifischen proteolytischen Aktivität auf plasminogenhaltigen Fibrinplatten eine Plasminogen-Aktivator-Aktivität. Diese Aktivator-Aktivität ist durch EACA in 5×10−3M Konzentration nicht hemmbar. Gesamt-Homogenate, die sowohl Sediment als auch Überstand enthielten, zeigten keine Plasminogen-Aktivator-Aktivität auf bovinen Fibrinplatten. In den vorliegenden Untersuchungen konnte gezeigt werden, daß die Überstand-Fraktion einen Inhibitor für Plasmin enthält, der die „spezifisch-fibrinolytische“ Aktivität der Sediment-Fraktion zu hemmen vermag.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary In 82 dogs, both male and female, acute experimental pancreatitis was produced according to the procedure published byElliott, Williams andZollinger. Along with microscopic, histochemical and electron microscopic investigations, changes of enzyme and electrolyte concentrations as well as of the activity of proteinases were studied in order to pursue the pathways of pancreatic disorders. Besides, the examinations included studies on the effects of pancreatitis on the blood clotting mechanism and on changes of plasma volumes. It appears that, after an initial secretory obstruction and enlargement of the isthmic epithelium (“Isthmus blockade”), dilatation of acini and reflux of enzymes at the site of their production can be regarded as the most important lesions. Electron microscopic studies showed an irritation of the basal endoplasmatic reticulum at the beginning of the cellular lesion. In the further course, parapedesis through the cellular membranes can be observed, a phenomenon, the sequelae of which may be paralysis of preterminal or terminal vessels. Stimulation of functioning acinar cells obviously is followed by an “energetic” insufficiency, if ductal obstruction is maintained. When isthmus blockade continues, the initially reversible cellular lesion becomes irreparable, prodominantly because of vascular paralysis and consecutive tissue hypoxia. Enzyme displacement and local hypoxia form a circulus vitiosus which results in a tryptic necrosis. Chymotrypsin, trypsinogen, and trypsin could not be proved. Proteinases which were found effective at a neutral pH, however, appear to be responsible for the enzymatic auto-digestion of the pancreas.
    Notes: Zusammenfassung Bei 82 Hunden beiderlei Geschlechts wurde eine akute Pankreatitis in der Technik nachElliott, Williams undZollinger erzeugt. Pathologisch-anatomische, histochemische und elektronenmikroskopische Untersuchungen wurden den Befunden der Fermententgleisung, der Transmineralisation und Proteinasenaktivität gegenübergestellt, um die „Zündschnur“ des pathischen Geschehens zu verfolgen. Hiernach resultiert neben der „Sekretplombe“ eine Verquellung der Isthmusepithelien — eine „Isthmusblockade“. Die Folge ist eine Acinusdilatation und Enzym- wie Sekretrückstauung im Bereich der Produktionsstätte. Submikroskopisch läßt sich zeigen, daß am Beginn der Zellschädigung eine Irritation des basalen endoplasmatischen Reticulum besteht, in deren weiterem Verlaufe es zum Phänomen der Parapedese über die Zellbasis kommt, deren Folge die Paralyse der präterminalen und terminalen Strombahn sein kann. Die unter Sekretionsreiz gegen Sekretstauung arbeitenden Zellen geraten offenbar in eine „energetische“ Insuffizienz. Der zunächst noch reversible Zellschaden wird bei anhaltender Isthmusblockade durch Paralyse der capillären Strombahn und konsekutive Hypoxie dekompensierbar. Hypoxie und Fermententgleisung potenzieren einander und bilden einen Circulus vitiosus, dessen Folge die tryptische Nekrose ist. Chymotrypsin, Trypsinogen bzw. Trypsin waren nicht bestimmbar. Dagegen wurden im neutralen Bereiche wirksame Proteinasen nachgewiesen, die für die fermentative Autodigestion verantwortlich gemacht werden können. Weiterhin wird die Wirkung der Pankreatitis auf Blutgerinnung, Serumelektrolyte, Serumfermente und Plasmavolumen diskutiert.
    Type of Medium: Electronic Resource
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