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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 20 (1972), S. 62-64 
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: In maize (Zea mays L. cv. DEKALB XL 640) leaf discs or root segments fusicoccin (FC) is by about 5-10 times more active than its derivative dideacetylfusicoccin (DAF) in stimulating proton extrusion and the hyperpolarization of the transmembrane electrical potential (PD). Also the uptake by leaf discs in liquid medium and the affinity for a receptor present in cell free membrane preparations are by 3–5 times greater for FC than for DAF, while a much greater difference (by about two orders) in activity between the two substances is observed for their effects on leaf transpiration.FC reaches in the leaf tissue a concentration much higher than that of DAF. This is interpreted as due to the higher activity of FC in inducing stomata opening, thus accelerating the transpiratory water flow. The long distance translocation of both FC and DAF mainly depends on mass flow. Thus the initial stimulus on transpiration would induces an increase in concentration of the active substance in the reactive tissue, in a kind of autocatalytic cycle, resulting in the amplification of the difference in activity at cell level between the two toxins.The data on the promotion of H+ extrusion and the hyperpolarization of PD confirm the correlation and thus the possible cause-effect relationship between FC (or its less active derivative DAF) binding to a receptor at the membrane, and the functions studied. The relationships between the “pathological” (transpiration and wilting) and the “physiological” (electrogenic proton secretion) effects of FC and DAF are also in agreement with the view that all of the known effects of FC and of its active derivatives can be explained as consequences of the activation of electrogenic proton extrusion.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract During January/February 1990 the floristic composition and biomass of diatoms and dinoflagellates in Terra Nova Bay (Ross Sea) were investigated. The study area included eight stations, seven of which were inshore and one offshore. Of the 94 taxa identified, 58 were diatoms and 34 were dinoflagellates. Cell densities were higher in surface layers and particularly at two stations, one located at the centre of the bay, and the other to the south of the Terra Nova station. While density data showed that the diatoms predominated over the dinoflagellates and over Phaeocystis sp., the biomass values were largely made up of the dinoflagellates contribution.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 40 (1998), S. 187-194 
    ISSN: 0021-9304
    Keywords: skin substitute ; hyaluronic acid derivatives ; integrins ; extracellular matrix ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: Coverage of large, full-thickness burns presents a challenge for the surgeon due to the lack of availability of the patient's own skin. Currently, tissue engineering offers the possibility of performing a suitable therapeutic wound coverage after early burn excision by using cultured keratinocyte sheets supported by a dermal layer. The aim of this study was to develop and characterize a skin substitute composed of both epidermal and dermal elements. For this purpose we grew keratinocytes and fibroblasts separately for 15 days within two different types of biomaterials. Cells then were co-cultured for an additional period of 15 days, after which samples were taken and processed with either classic or immunohistochemical stainings. Results showed that (1) human fibroblasts and keratinocytes can be cultured on hyaluronic acid-derived biomaterials and that (2) the pattern of expression of particular dermal-epidermal molecules is similar to that found in normal skin. The data from this study suggest that our skin equivalent might be useful in the treatment of both burns and chronic wounds. © 1998 John Wiley & Sons, Inc. J Biomed Mater Res, 40, 187-194, 1998.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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