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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Trends in Biochemical Sciences 6 (1981), S. 16-19 
    ISSN: 0968-0004
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0014-5793
    Keywords: (Rat thoracic aorta. Rat mesenteric artery. Pithed rat) ; Endothelin-1 ; Sarafotoxin ; Vasoconstriction
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1741-0444
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Description / Table of Contents: Sommaire Le diagnostic cytologique clinique est un élément important dans la détection précoce du cancer. Toutefois la pénurie de cytologistes et le temps pris par ces examens empêchent leur généralisation. Pour remédier à cette situation, on a réalisé un prototype d'appareil qui permet la détection automatique de la tumeur. Un spot lumineux est dirigé sur le spécimen; on effectue un balayage sur environ 10000 noyaux de cellules. La densité optique modulée par le noyau est introduite dans le calculateur qui est susceptible de contrôler l'unicité de chacun des noyaux, de les classer parmi cinq catégories, et de totaliser le nombre de noyaux par catégorie. Toutes les opérations y compris les manipulations d'échantillons, sont complètement automatisées. Des tests préliminaires révèlent des résultats satisfaisants sur les préparations faites à partir des tumeurs à cellules ascitiques d'Ehrlich. Du fait que le calculateur dispose de bien d'autres possibilités, le diagnostic peut finalement être établi à partir de critères composites.
    Abstract: Zusammenfassung Die klinische Zytologie ist eine wichtige diagnostische Disziplin zur Krebsfrüherkennung. Eine weitgehende Anwendung wird jedoch durch die geringe Zahl von Zytologen und durch die zeitraubende Untersuchungstechnik verhindert. Um diese Situation zu verbessern, wurde ein Prototypapparat konstruiert, der die Malignität automatisch bestimmen soll. Auf die Probe wird ein Lichtfleck geworfen. 10000 Zellkerne werden überstrichen. Die vom Kern modulierte optische Dichte wird in einen Rechner gefüttert, welcher einen einzelnen Kern als solchen erkennt und in fünf Flächenklassen einteilt; die Zahl der Kerne in jeder Klasse wird summiert. Alle Vorgänge, auch das mechanische Verfahren, verlaufen vollständig automatisch. Vorläufige Untersuchungen ergaben zufriedenstellende Ergebnisse an einer Präparation von Ehrlich-Aszites-Tumorzellen. Da der installierte Rechner verschiedene andere Möglichkeiten zum Erhalten verfügbarer Kriterien besitzt, sollte das Entscheidungsverfahren schließlich mit verschiedenen Kriterien durchgeführt werden.
    Notes: Abstract Clinical cytology is an important diagnostic procedure in the early detection of cancer. However, both the scarcity of cytologists and the time-consuming nature of the examination are hindering its application to mass survey. To alleviate this situation, a prototype apparatus was constructed so that the determination of malignancy could be made automatically. A spot of light is thrown upon a specimen. Scanning is performed over 10,000 cell nuclei. Optical density modulated by the nucleus is fed into a computer, which recognizes an individual nucleus as a single nucleus, classifies it into five area-levels, and totals the number of nuclei in each class. All the steps including the mechanical operation are completely automated. Preliminary tests revealed satisfactory results on the preparation made from Ehrlich's ascitic cell tumour. Because the installed computer has other several potentialities for yielding available criteria, the decision-making procedure should finally be worked out by a composite criteria.
    Type of Medium: Electronic Resource
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  • 4
    Publication Date: 1995-07-01
    Description: Thrombomodulin (TM) is an anticoagulant endothelial cell surface glycoprotein containing six tandem epidermal growth factor (EGF)-like structures. We prepared a recombinant TM peptide (rTME1–6, from R214GHWA to DSGK466 of native TM) composed of these six EGF-like structures and investigated the effect of rTME1–6 peptide on the growth of the Swiss 3T3 fibroblast cell line. It was found that rTME1–6 induced proliferation of Swiss 3T3 cells and accelerated [3H]thymidine uptake into their DNA. [3H]Thymidine uptake increased in a dose- dependent manner, plateauing at 50 ng/mL rTME1–6, which was 1.8 times the control level. rTME1–6 peptide (50 ng/mL) also accelerated the DNA synthesis of human dermal fibroblasts (HDFs), A549 (a human lung cancer cell line), HepG2 (a human hepatocarcinoma cell line), and U937 cells (a human monocytic cell line) to 1.5, 1.6, 1.4, and 1.2 times the control level, respectively. The magnitude of the acceleration of DNA synthesis in Swiss 3T3 induced by rTME1–6 was approximately 20% of that of EGF on a molar basis. The uptake of [3H]thymidine was accelerated synergistically by coculture of the cells with rTME1–6 and insulin, similar to the coculture with EGF and insulin. The effects of rTME1–6 were abolished by addition of polyclonal antihuman TM IgG, whereas the actions of insulin and EGF were not influenced. Glucose uptake in Swiss 3T3 cells also increased 1.6 times over control levels by culture with 50 ng/mL rTME1–6 (1.25 nmol/L), compared with 2.7 times by 10 ng/mL EGF (1.66 nmol/L). Binding of [125I]EGF (0.5 ng/mL, 0.083 nmol/L) by the cells was inhibited by about 60% by addition of an eight-fold molar excess of nonlabeled EGF (0.664 nmol/L), whereas no inhibition of [125I]EGF binding was observed, even in the presence of a 1,000-fold molar excess (83 nmol/L) of rTME1–6. Specific binding of [125I]rTME1–6 on the cells showed a saturation curve, and the apparent concentration of rTME1–6 required for half maximum binding of the peptide on the cells was calculated to be 31.5 ng/mL. Thus, the overall results indicated that the rTME1–6 peptide had mitogenic activity for Swiss 3T3 cells, accelerated DNA synthesis and glucose uptake, and that the mitogenic activity might be mediated by binding of the peptide to a specific site different from the EGF receptor.
    Print ISSN: 0006-4971
    Electronic ISSN: 1528-0020
    Topics: Biology , Medicine
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  • 5
    Publication Date: 2001-12-01
    Print ISSN: 0009-9236
    Electronic ISSN: 1532-6535
    Topics: Chemistry and Pharmacology , Medicine
    Published by Wiley
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