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  • Gameto cides  (1)
  • Key words: Hemangioma – Vertebra – Compression – Spine – Tumor – Imaging – CT – MR imaging – Radiography  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    European radiology 10 (2000), S. 997-1002 
    ISSN: 1432-1084
    Keywords: Key words: Hemangioma – Vertebra – Compression – Spine – Tumor – Imaging – CT – MR imaging – Radiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. Compressive vertebral haemangiomas (VHs) are rare. Correct preoperative diagnosis is useful both for operative planning (since compressive VHs are extremely vascular lesions) and to allow preoperative embolisation. Numerous radiological signs for VHs have been described, but compressive VHs frequently have atypical features. In particular, magnetic resonance features are not well established. We present imaging features in three cases of compressive VH and review the imaging findings in an additional 106 previously published cases. Findings were typical in 52 of 80 plain film (65 %), 33 of 41 computed tomography (80 %) and 13 of 25 magnetic resonance examinations (52 %). The prevalence of previously described imaging features is reported. Awareness of the range of magnetic resonance features is important since this is frequently the initial investigation in patients presenting with symptoms of neural compression. Since computed tomography is typical in 80 % of cases, this is a useful confirmatory test if magnetic resonance features are suspicious but not diagnostic of compressive VH.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Sexual plant reproduction 4 (1991), S. 235-243 
    ISSN: 1432-2145
    Keywords: Male sterility ; Pollen ; Anther ; Gameto cides ; Chemical hybridizing agents
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Several unrelated compounds are known to selectively inhibit the development of the male gametophyte. When applied at suitable dosages to plants at the appropriate stages of anther development, these substances block the formation of fertile pollen. The affected stage of pollen development is characteristic of the specific chemical structure of the compound, ranging from effects on microspore meiosis to the formation of pollen defective in the ability to germinate or fertilize. The range of effects mediated by these substances, and by known male-sterile mutants, indicates that microspore development has several critical phases that are particularly sensitive to fatal inhibition. We propose that chemical inhibitors of pollen development deserve attention as tools for elucidating the regulation of pollen development.
    Type of Medium: Electronic Resource
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