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  • Instream gravel extraction  (1)
  • swim-up  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Channel adjustments to reservoir construction and gravel extraction along Stony Creek, California (1993)
    Springer
    Environmental geology 21 (1993), S. 256-269 
    Details
    ISSN: 1432-0495
    Schlagwort(e): Instream gravel extraction ; Channel incision ; Downstream effects of reservoirs
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie
    Notizen: Abstract Stony Creek (drainage area 1920 km2), a tributary to the Sacramento River 200 km north of San Francisco, has experienced channel adjustments to both dam construction and instream gravel extraction. Black Butte Dam, constructed in 1963, reduced flood peaks and trapped the annual 100,000 m3 of bedload sediment formerly delivered from the upper watershed. The reach below the dam changed from an active braided channel to an incised, single-thread channel shortly after dam construction. About 25 km downstream of the dam, large instream gravel mines annually extract 230,000–580,000 m{su3} and have induced channel incision of over 5 m, necessitating bridge repairs costing US$1.4 million.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00775916
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Effect of Percoll wash on sperm motion parameters and subsequent fertility in intrauterine insemination cycles (1995)
    Springer
    Journal of assisted reproduction and genetics 12 (1995), S. 48-54 
    Details
    ISSN: 1573-7330
    Schlagwort(e): Percoll ; computerized automated semen analysis ; intrauterine insemination ; swim-up
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Purpose This study examined sperm motion parameters as measured by computerized automated semen analysis before and after a Percoll wash and determined if differences in any parameter were correlated with fertility subsequent to intrauterine insemination (IUI). Results Total motile sperm decreased following the washing procedure from 79.0 ± 9.0 to 37.2 ± 7.6 million sperm. Motility increased from a mean of 43.4% to 61.7% (P〈0.001). Other motility parameters also changed significantly (P〈0.001) as follows: curvilinear velocity (VCL), 43.4 to 61.7 μm/s; straight-line velocity (VSL), 21.3 to 26.7 μm/s; linearity 53.1 to 45.2%; lateral head displacement (ALH), 2.97 to 3.94 μm. Similar changes occurred following a swim-up preparation, although changes in mean motility, VCL, and ALH were significantly greater when compared to Percoll. The postwash changes were not accounted for merely by time lapse in preparation since reanalyzed untreated controls did not show the same changes in motion parameters. Prewash linearity in those specimens which resulted in pregnancies was greater than in those which did not (P=0.28). No other significant differences in pre-or post-Percoll washed sperm motion parameters were found between pregnant vs nonfertile cycles. Conclusion Following Percoll wash all CASA-generated motility parameters were significantly altered, but there was little association between these parameters and pregnancy achieved in IUI cycles.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02214129
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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