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  • Endosperm  (2)
  • Key words: Empyema — Videoscopy — Debridement — Fibropurulent empyema — Lung — VATS  (1)
  • 1
    Electronic Resource
    Electronic Resource
    The significance of genic balance to endosperm development in interspecific crosses (1980)
    Springer
    Theoretical and applied genetics 57 (1980), S. 5-9 
    Details
    ISSN: 1432-2242
    Keywords: Endosperm ; Evolution ; Interspecific crosses ; Solanums ; 2n gametes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The endosperm has played a significant role in the evolution of angiosperms because of its physiological and genetic relationships to the embryo. One manifestation of this evolutionary role is its abnormal development in interploidy crosses. It is now established that the endosperm develops abnormally in interploidy-intraspecific crosses when the maternal: paternal genome ratio deviates from 2∶1 in the endosperm itself. We propose an Endosperm Balance Number (EBN) hypothesis to explain endosperm development in both interploidy-intraspecific and interspecific crosses. Each species is assigned an EBN on the basis of its crossing behavior to a standard species. It is the EBN which determines the effective ploidy in the endosperm of each species, and it is the EBNs which must be in a 2∶1, maternal:paternal ratio. The EBN of a species may be determined by a few genes rather than the whole genome. This hypothesis brings most intraspecific-interploidy and interspecific crossing data under a single concept with respect to endosperm function. The implications of this hypothesis to isolating mechanisms, 2n gametes, the evolution of disomic polyploids, and reciprocal differences in seed development are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00276002
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Video-assisted thoracoscopic surgery in the management of loculated empyema (2000)
    Springer
    Surgical endoscopy and other interventional techniques 14 (2000), S. 175-178 
    Details
    ISSN: 1432-2218
    Keywords: Key words: Empyema — Videoscopy — Debridement — Fibropurulent empyema — Lung — VATS
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Background: Fibropurulent empyema (stage II of Light) does not respond to antibiotic therapy and simple drainage. If the condition is inadequately treated, restrictive pulmonary deficit develops, necessitating thoracotomy and decortication. We report our experience with the videoscopic management of stage II and limited stage III disease. Methods: Ten consecutive patients underwent videoscopic debridement of fibropurulent empyema; three of them required removal of limited visceral and parietal rind. Results: The mean operating time was 42 ± 8.1 min. Postoperative pyrexia and leucocytosis settled within 4.2 ± 2.1 days and 13.1 ± 3.2 days, respectively. Intercostal chest tubes were removed by 4.5 ± 1.0 days. The mean fall in hematocrit following surgery was 4.9%. Parenteral analgesics were required for 1.0 ± 0.5 days and oral analgesics for 3 ± 1.6 days. The mean postoperative stay was 11 ± 8.1 days. No patient required any further intervention. Conclusions: Videoscopic debridement of empyema produces excellent results, with minimal patient morbidity and a short hospital stay. We recommend it as the preferred method for first-line management of fibropurulent (stage II) empyema.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004649900094
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    The nature of the genetic control of Endosperm Balance Number based on aneuploid analysis of Datura (1999)
    Springer
    Sexual plant reproduction 12 (1999), S. 71-75 
    Details
    ISSN: 1432-2145
    Keywords: Key words Crossing barriers ; Endosperm ; Speciation ; Karyotyping
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  The genetic control of Endosperm Balance Number (EBN), a mechanism of effective ploidy that controls seed development, was studied using aneuploidy. The Endosperm Balance Number hypothesis proposes that each species has an effective ploidy (EBN) in the endosperm and that it is the effective ploidies, rather than the numerical (actual) ploidies, that must be in a 2:1 maternal to paternal ratio for normal endosperm development. Experiments were conducted in Datura stramonium L. (2n=4x=48) to determine if more than one chromosome but less than the whole genome could change the EBN of the female. Triploids were crossed with tetraploids to produce aneuploids. Most plump seeds gave rise to 2n=4x=48 chromosome plants. Six plants had between 38 and 47 chromosomes. Karyotyping of these plants supported the conclusion that only two chromosomes (1.2 and 19.20), when extra, were necessary to change the EBN of the central cell.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004970050174
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    Paper (German National Licenses)
    Fulltext
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