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  • ground water  (2)
  • Acanthisittidae  (1)
  • Blood transfusion  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Recurrence of colorectal cancer and perioperative blood transfusion (1990)
    Springer
    Diseases of the colon & rectum 33 (1990), S. 127-130 
    Details
    ISSN: 1530-0358
    Keywords: Colorectal cancer ; Blood transfusion ; Recurrence ; Mitogenic factors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02055541
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Ancient DNA sequences reveal unsuspected phylogenetic relationships within New Zealand wrens (Acanthisittidae) (1994)
    Springer
    Cellular and molecular life sciences 50 (1994), S. 558-563 
    Details
    ISSN: 1420-9071
    Keywords: Acanthisittidae ; ancient DNA ; ancient populations ; avian 12S DNA ; contamination ; New Zealand wrens
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Ancient DNA sequences from preserved specimens are increasingly being used for the investigation of Pacific Island ecosystems prior to the large scale modification and extinction of endemic biota associated with human colonization. However, many difficulties are associated with the use of ancient DNA sequences in studies of genetically close taxa. In this paper, these difficulties are discussed as they relate to a study involving extinct and extant members of an ancient New Zealand avian family, the New Zealand wrens (Acanthisittidae). Sequences of the mitochondrial small ribosomal subunit RNA gene (12S) were obtained from museum specimens of several wren taxa in order to investigate their phylogenetic relationships and the taxonomic status of a rock wren (Xenicus gilviventris) subspecies. Limitations due to sample size and 12S sequence variability as well as the difficulties in authenticating ancient DNA sequences prevent firm conclusions but the data suggest unsuspected phylogenetic relationships exist and raise the possibility that conservation management of rock wren populations is required.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01921725
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    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
    Keywords: denitrification ; riparian zone ; stream ; plant uptake ; mass balance ; ground water
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02208124
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    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
    Keywords: denitrification ; riparian zone ; stream ; plant uptake ; mass balance ; ground water
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027089
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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