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  • 1995-1999  (4)
  • 1905-1909
  • Chemistry  (2)
  • Chronisch lymphatische Leukämie  (1)
  • Cucumis melo  (1)
  • 1
    ISSN: 1433-0407
    Keywords: Schlüsselwörter Polymerase-Kettenreaktion ; Chronisch lymphatische Leukämie ; Monoklonalität ; Leptomeningeale Infiltration ; Key words Polymerase chain reaction ; Chronic lymphatic leukemia ; Monoclonality ; Leptomeningeal infiltration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary The diagnosis of leptomeningeal dissemination of chronic lymphatic leukemia (CLL) by conventional cytology is unreliable because cytomorphologic criteria of malignancy are often lacking. Immunophenotyping of leukocyte differentiation antigens may also be of limited diagnostic value due to the small number of cells in cerebrospinal fluid (CSF) samples. Molecular methods may support the specific diagnosis of leptomeningeal infiltration of CLL. We present an 54 old patient who was diagnosed with CLL five years ago. Despite clinical signs of leptomeningeal involvement neither magnetic resonance imaging (MRI) nor conventional CSF analysis were suggestive of lymphomatous meningitis. Using PCR we selectively amplified the highly variable and clone-specific CDR3 region of the locus encoding the immunoglobulin heavy chain (IgH) in DNA obtained from both CSF and peripheral blood cells. Analysis of PCR products by high resolution gel electrophoresis revealed a single DNA fragment respectively indicating the presence of a monoclonal cell population in both compartments. DNA sequence analysis of the amplified CDR3 segments confirmed the clonal identity of cells and the leptomeningeal dissemination of CLL.
    Notes: Zusammenfassung Die Diagnose einer leptomeningealen Infiltration ist bei der chronisch lymphatischen Leukämie (CLL) mit konventionellen zytomorphologischen Methoden nicht hinreichend möglich. Das Zellbild ist meist monomorph, und eindeutige Malignitätskriterien fehlen. Eine Immunphänotypisierung mit Bestimmung von Leukozytendifferenzierungsantigenen erlaubt eine weitere Eingrenzung, ist jedoch häufig wegen geringen Zellmaterials nur eingeschränkt möglich. Molekulargenetische Methoden können zur weiteren Diagnosesicherung eingesetzt werden. Bei einem 54jährigen Patienten mit einer seit 5 Jahren bestehenden Diagnose einer CLL konnte trotz klinischen Verdachts weder kernspintomographisch noch in der konventionellen Liquordiagnostik ein Anhalt für eine leptomeningeale Infiltration der CLL gefunden werden. Mit der Polymerase-Kettenreaktion (PCR) wurde die hochvariable, B-Zell-Klon-spezifische CDR3-Region des für die Immunglobulinkette-Schwerkette (IgH) kodierenden Locus selektiv amplifiziert. Als Ausgangsmaterial wurde zelluläre DNA aus Liquor und Blut des Patienten verwendet. Die Analyse der PCR-Produkte mit hochauflösender Gelelektrophorese ergab sowohl für B-Zellen aus dem Liquor als auch für B-Zellen aus dem Blut ein einzelnes DNA-Fragment. Hierdurch wurde der Nachweis erbracht, daß die Zellpopulationen in beiden Kompartimenten monoklonal sind. Die DNA-Sequenz-Analyse der amplifizierten CDR3-Segmente bestätigte die klonale Identität der Zellen und damit eindeutig die leptomeningeale Infiltration der CLL.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Plant cell, tissue and organ culture 43 (1995), S. 259-265 
    ISSN: 1573-5044
    Keywords: Asymmetric hybridization ; Cucumis melo ; C. sativus ; electrofusion ; Ploidy level ; RAPD ; somatic incompatibility
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The aim of this investigation was to develop a protocol to be used in asymmetric protoplast fusions with breeding material of melon and cucumber. Efficient methods for plant regeneration from unfused protoplasts of commercial melon lines were established and are reported. Ploidy levels of explant material and plants, regenerated from protoplasts were analyzed. Electrofusion was carried out between melon protoplasts and irradiated and non-irradiated donor protoplasts of cucumber. Although initial plating efficiencies of heterokaryons were high, development stopped after a few divisions. In control experiments, shoots were regenerated at high frequencies. In only two fusion experiments, development continued to the callus stage, but further development was not observed. When analyzed with PCR using arbitrary primers, the majority of these calli DNA were identical to the melon DNA. However, a few of the examined calli, although being mainly homologous to melon, were observed to have new bands corresponding to bands specific for cucumber. Due to sexual incompatibility, successful hybridization between cucumber and melon was never obtained by sexual crosses. We suggest that the failure to regenerate plants in our fused material could be explained partially by an analogous somatic incompatibility reaction.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 68 (1996), S. 1170-1171 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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