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  • ground water  (2)
  • Blood transfusion  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Recurrence of colorectal cancer and perioperative blood transfusion (1990)
    Springer
    Diseases of the colon & rectum 33 (1990), S. 127-130 
    Details
    ISSN: 1530-0358
    Schlagwort(e): Colorectal cancer ; Blood transfusion ; Recurrence ; Mitogenic factors
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract In a prospective study of 35 patients undergoing surgery for colorectal cancer, the mitogenic activity of plasma was measured using 3T3 Swiss fibroblasts as target cells. Transfused patients exhibited a 100 percent increase in mitogenic activity over preoperative values compared with no significant change in nontransfused patients. Samples were taken from blood during 28 days of storage following donation, and mitogenic activity measured. The mitogenic activity increased with storage time, the principal changes occurring from the end of the second week. The increased mitogenic activity in patients following transfusion and in stored blood may be a factor in the mediation of the deleterious effect of transfusion on recurrence in colorectal cancer and perhaps “fresh” blood, if required, should be used.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02055541
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Nitrate depletion in the riparian zone and stream channel of a small headwater catchment (1990)
    Springer
    Hydrobiologia 202 (1990), S. 13-26 
    Details
    ISSN: 1573-5117
    Schlagwort(e): denitrification ; riparian zone ; stream ; plant uptake ; mass balance ; ground water
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract A mass balance procedure was used to determine rates of nitrate depletion in the riparian zone and stream channel of a small New Zealand headwater stream. In all 12 surveys the majority of nitrate loss (56–100%) occurred in riparian organic soils, despite these soils occupying only 12% of the stream's border. This disproportionate role of the organic soils in depleting nitrate was due to two factors. Firstly, they were located at the base of hollows and consequently a disproportionately high percentage (37–81%) of the groundwater flowed through them in its passage to the stream. Secondly, they were anoxic and high in both denitrifying enzyme concentration and available carbon. Direct estimates of in situ denitrification rate for organic soils near the upslope edge (338 mg N m−2 h−1) were much higher than average values estimated for the organic soils as a whole (0.3–2.1 mg N m−2 h−1) and suggested that areas of these soils were limited in their denitrification activity by the supply of nitrate. The capacity of these soils to regulate nitrate flux was therefore under-utilized. The majority of stream channel nitrate depletion was apparently due to plant uptake, with estimates of the in situ denitrification rate of stream sediments being less than 15% of the stream channel nitrate depletion rate estimated by mass balance. This study has shown that catchment hydrology can interact in a variety of ways with the biological processes responsible for nitrate depletion in riparian and stream ecosystems thereby having a strong influence on nitrate flux. This reinforces the view that those seeking to understand the functioning of these ecosystems need to consider hydrological phenomena.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00027089
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Nitrate depletion in the riparian zone and stream channel of a small headwater catchment (1990)
    Springer
    Hydrobiologia 202 (1990), S. 13-26 
    Details
    ISSN: 1573-5117
    Schlagwort(e): denitrification ; riparian zone ; stream ; plant uptake ; mass balance ; ground water
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract A mass balance procedure was used to determine rates of nitrate depletion in the riparian zone and stream channel of a small New Zealand headwater stream. In all 12 surveys the majority of nitrate loss (56–100%) occurred in riparian organic soils, despite these soils occupying only 12% of the stream's border. This disproportionate role of the organic soils in depleting nitrate was due to two factors. Firstly, they were located at the base of hollows and consequently a disproportionately high percentage (37–81%) of the groundwater flowed through them in its passage to the stream. Secondly, they were anoxic and high in both denitrifying enzyme concentration and available carbon. Direct estimates ofin situ denitrification rate for organic soils near the upslope edge (338 mg N m−2 h−1) were much higher than average values estimated for the organic soils as a whole (0.3–2.1 mg N m−2 h−1) and suggested that areas of these soils were limited in their denitrification activity by the supply of nitrate. The capacity of these soils to regulate nitrate flux was therefore under-utilized. The majority of stream channel nitrate depletion was apparently due to plant uptake, with estimates of thein situ denitrification rate of stream sediments being less than 15% of the stream channel nitrate depletion rate estimated by mass balance. This study has shown that catchment hydrology can interact in a variety of ways with the biological processes responsible for nitrate depletion in riparian and stream ecosystems thereby having a strong influence on nitrate flux. This reinforces the view that those seeking to understand the functioning of these ecosystems need to consider hydrological phenomena.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02208124
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Artikel (Nationallizenzen)
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