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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 459 (1985), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0584
    Keywords: Blood stem cells ; Cryopreservation ; DMSO ; Leukapheresis ; Marrow repopulating ability ; Blutstammzellen ; Einfrierung ; DMSO ; Leukapheresen ; Repopulationsfähigkeit des Knochenmarks
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Es war das Ziel der Untersuchungen, eine Einfriermethode für hämopoetische Blutstammzellen zu etablieren. Blutleukozyten wurden mittels eines IBM-Blood-Cell-Separator gewonnen und in Gegenwart von 10% DMSO in Plastik-Beuteln eingefroren, wobei der Kühlprozeß vorprogrammiert war. Der Auftauvorgang dauerte nur wenige Minuten; anschließend wurde das DMSO schrittweise verdünnt, bevor die aufgetaute Zellsuspension für in-vitro wie in-vivo-Versuche verwendet wurde. Die durchschnittliche Ausbeute an mononukleären Zellen von 82 Leukapheresen betrug 86%. Zur Beurteilung der Ausbeute von eingefrorenen hämopoetischen Blutstammzellen wurde die “soft agar culture” Methode in einer Modifizierung für den Hund verwendet. Die CFUc-Ausbeute pro l × 106 mononukleäre Zellen und pro Leukapherese war nach verschieden langer Einfrierdauer (1 bis 6 Monate und 7 bis 27 Monate) nicht signifikant unterschiedlich. Die hämopoetische Repopulationsfähigkeit eingefrorener Blutstammzellen wurde mittels Transfusion in ganzkörperbestrahlte Beagles untersucht. Dabei zeigte sich, daß das hämopoetische Repopulationsmuster am 10. Tag nach Transfusion vergleichbarer Zahlen an frischen oder eingefrorenen Leukozyten nicht signifikant unterschiedlich war, wie anhand von Knochenmarkausstrichen und histologischen Knochenmarkschnitten sowie anhand der Granulozytenkonzentration im peripheren Blut nachgewiesen werden konnte.
    Notes: Summary It was the purpose of this study to establish and evaluate a freezing and-thawing method for preservation of hemopoietic stem cells from the peripheral blood. Blood leukocytes collected by means of an IBM Blood-Cell-Separator were frozen in plastic bags using 10% DMSO and controlled cooling rates. Thawing was performed rapidly, and DMSO was diluted and removed prior to the in-vitro and in-vivo assays. The mean recovery of mononuclear cells collected from 82 leukaphereses was 86%. To assess the recovery of cryopreserved hemopoietic stem cells, the soft agar culture method adapted for the dog was used. There was no significant difference in the CFUc recovery per 1 × 106 mononuclear cells or in per leukapheresis after different Cryopreservation times (1–6 and 7–27 months). To evaluate the hemopoietic repopulation capability of cryopreserved blood stem cells, leukapheresis-derived leukocytes were transfused into 1200 R whole body x-irradiated dogs. The hemopoietic repopulation pattern at day 10 after transfusion of comparable numbers of fresh or frozen leukocytes was not significantly different, as measured in bone marrow smears and sections and by granulocyte concentration in the peripheral blood.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Annals of hematology 46 (1983), S. 39-45 
    ISSN: 1432-0584
    Keywords: Hemopoiesis ; Extramedullar ; Spleen ; Dextran sulfate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The spleen of normal dogs (beagles) shows only slight hemopoietic activity, characterized by the presence of megakaryocytes in mitosis and small groups of erythroblasts scattered throughout the red pulp of the organ. Repeated intravenous injection of dextran sulfate, at a dose of 15 mg per kg body weight, produced markedly enhanced erythropoietic and megakaryocytopoietic activity in the splenic red pulp, without concomitant increase in splenic granulopoiesis. The probable existence of a micro-environment adequate for erythro- and megakaryocytopoietic differentiation of stem cells is discussed.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of cancer research and clinical oncology 113 (1987), S. 235-240 
    ISSN: 1432-1335
    Keywords: Brain toxicity ; Brain irradiation ; Drugradiation interaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Brain damage following cranial radiation therapy can be crippling or even life-threatening and has been studied in both patients and animals. An additional toxic effect of chemotherapy has been found in children, who died following brain irradiation and systemic chemotherapy for the treatment of acute lymphoblastic leukemia. To study the interaction of radiation and drugs on brain tissue, we treated rabbits with brain irradiation and/or i.v. methotrexate. For a period of up to 3 months following radiation therapy, brain morphology was compared in seven treatment groups. Weekly doses of methotrexate administered i.v. produced no brain damage. Histological examination showed myelin swelling and beading 14 weeks after fractionated brain irradiation with 24 Gy. Combination of brain irradiation and methotrexate produced additional hypertrophy of microglia and pyknosis of adventitial cells. In none of these groups, even after doses of 48 Gy brain irradiation, was calcification or brain necrosis observed during the first 14 weeks following irradiation.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 95 (1969), S. 377-395 
    ISSN: 1432-0878
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung 1. Die frühen Entwicklungsstadien des Knochenmarkstromas während des Beginns der Blutzellbildung wurden an Wistar-Ratten mit Hilfe einer Kombination von histologischen und zytologischen Methoden untersucht. Besondere Aufmerksamkeit galt der nervalen Versorgung des fetalen und neonatalen Knochenmarks und ihrer Beziehung zur Blutzellbildung. 2. Am 20. Tag der Fetalperiode sind Blutgefäße des Knochenmarks in Form von Sinusoiden entwickelt. Am 21. Tag der Fetalperiode können die ersten Nervenfasern festgestellt werden. Retikulinfasern sind kurz vor Geburt im Knochenmark erkennbar. Sie formen ein Netzwerk zwischen den Zellen des Parenchyms und bilden damit ein Stützgerüst. Demgegenüber können definitive erythropoetische und myelopoetische Vorstufen der Knochenmarkzellen erst 24 Std nach Geburt mit Sicherheit nachgewiesen werden. 3. Die frühe Entwicklung eines innervierten Knochenmarkstromas, das der Blutzellbildung in diesem Organ vorausgeht, stellt die Bedeutung des Stromas für die Blutzellbildung heraus. Durch das innervierte Stroma wird offenbar ein spezifisches Milieu geschaffen, das für die Proliferation, Differenzierung und Ausschwemmung von Blutzellen nötig ist.
    Notes: Summary 1. The early stages of development of the stroma of the bone marrow during the onset of the blood cell formation were studied in rats by combined histological and cytological methods. Special attention was dedicated to the study of the innervation of the fetal marrow in relation to the beginning of hemopoiesis. 2. During the 21st day of fetal life, the first nerve fibres can be demonstrated while the blood cell precursors as members of the erythropoietic or myelopoietic families can be recognized only one day after birth. 3. The early development of an innervated stroma that preceeds the differentiation of blood forming cells in the bone marrow, emphasizes the importance of the role of the stroma in this organ, and provides the marrow with a specific microenvironment that is adequate for the proliferation, differentiation and release of the blood elements.
    Type of Medium: Electronic Resource
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