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  • 1
    Electronic Resource
    Electronic Resource
    Seasonal variation in the lipid content of culturedLaminaria japonica: fatty acids, sterols, β-carotene and tocopherol (1994)
    Springer
    Journal of applied phycology 6 (1994), S. 25-29 
    Details
    ISSN: 1573-5176
    Keywords: brown algae ; Laminaria japonica ; fatty acids ; sterols ; β-carotene ; tocopherol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Seasonal variation in major lipid constituents of nutritional importance in culturedLaminaria japonica Aresch., such as fatty acids, sterols, β-carotene and tocopherol, were investigated from December to October, the growing season. The total and saturated fatty acid contents were minimal in midsummer. Mono-unsaturated fatty acids gradually increased from late summer to autumn. The polyunsaturated fatty acid content (PUFA, (n-6) family) was maximal during warm months, while (n-3) PUFAs were most abundant during the cold months when algal thalli were very young, and decreased gradually toward October when sori had developed. Fucosterol content was maximum from February to June, but decreased steeply by nearly a half toward October, when 24-methylene cholesterol was highest although much less than fucosterol. The β-carotene and tocopherol contents were maximal from July to September and slight during the winter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02185900
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  • 2
    Electronic Resource
    Electronic Resource
    Incorporation of14C-radioactivity into various lipid classes at different growth-stages of culturedLaminaria japonica (1992)
    Springer
    Journal of applied phycology 4 (1992), S. 189-195 
    Details
    ISSN: 1573-5176
    Keywords: lipid metabolism ; complex lipids ; neutral lipids ; Laminaria japonica ; Phaeophyceae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A study is reported on the incorporation of14C-acetate into lipid classes from three different growth stages ofLaminaria japonica, a species long used for food in Japan. This was done because of the possible utilization of its lipids. Radioactivity incorporated into whole lipids in the three growth stages under the same experimental conditions (10 °C, 500 lux) increased with maturity of the thalli. The radioactivity was found mainly in PC, TG and 1,2-DG and subsequently distributed into other lipid classes (PG,PI,PE,MGDG,SQDG and DGDG) to a lesser extent. The incorporation patterns of the former group were similar at all stages, but those of the latter group differed slightly according to growth stage. In juvenile thalli,14C was incorporated to a much higher extent into PG, MGDG, PI and fucosterol than PE, SQDG, DGDG and MG, while the14C-incorporation into MG, SQDG, DGDG and PS in the mature growth stage was higher than into the other lipid classes. The absolute level of incorporation was higher for all these compounds in mature thalli than the thalli of other growth stages.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02161204
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Incorporation of 14C-radioactivity into lipid classes at different maturity of Laminaria japonica Aresch. cultured under natural and partially controlled conditions (1993)
    Springer
    Hydrobiologia 260-261 (1993), S. 621-625 
    Details
    ISSN: 1573-5117
    Keywords: lipid metabolism ; lipid classes ; Laminaria japonica ; brown algae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A study to assess which environmental or developmental factors predominate in the biosynthesis of lipids of Laminaria japonica Aresch. blades was undertaken by means of 14C-labelling technique. In experiment 1, kelp blades at different growth stages were collected in different cultural seasons. In experiment 2, kelp blades of different sizes and maturity cultured simultaneously for two months in the same sea area were collected at the same time. The following results were obtained. In experiment 1, the 14C-incorporation into whole lipids was lowest in juvenile blades collected at the end of autumn and highest in blades of middle size collected in winter. However, the highest counts were incorporated in PC among complex lipid classes from all size classes of blades in both experiments 1 and 2. In experiment 2, 14C-incorporation patterns of individual lipid classes were characteristically different depending on the sizes of blades even under the same cultural condition. Thus, the biosynthesis of lipids in this kelp seems to be affected essentially by developmental factors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00049080
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  • 4
    Electronic Resource
    Electronic Resource
    Antitumor activity of marine algae (1990)
    Springer
    Hydrobiologia 204-205 (1990), S. 577-584 
    Details
    ISSN: 1573-5117
    Keywords: antitumor ; Ehrlich carcinoma ; lipids ; Meth-A fibrosarcoma ; polysaccharides ; seaweed
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Powdered tissue from 46 species of air-dried marine algae (four green, 21 brown and 21 red algae) were screened for antitumor activity. Significant activity against Ehrlich carcinoma was found in the brown algae Scytosiphon lomentaria (69.8% inhibition), Lessonia nigrescens (60.0%), Laminaria japonica (57.6%), Sargassum ringgoldianum (46.5%), the red algae Porphyra yezoensis (53.2%) and Eucheuma gelatinae (52.1%) and the green alga Enteromorpha prolifera (51.7%). Five brown and four red algae showed appreciable antitumor activity against Meth-A fibrosarcoma. To identify specific molecules with antitumor activity, 15 kinds of polysaccharide preparations of seaweed origin and 24 kinds of lipid fractions extracted from various seaweeds were tested. Appreciable inhibition of Ehrlich carcinoma was found for fucoidan preparations from Undaria pinnatifida and Sargassum ringgoldianum, for carrageenans and for porphyran. Several glycolipid and phospholipid fractions from brown and red algae were effective against Meth-A fibrosarcoma.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00040290
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  • 5
    Electronic Resource
    Electronic Resource
    Content of arachidonic and eicosapentaenoic acids in polar lipids from Gracilaria (Gracilariales, Rhodophyta) (1990)
    Springer
    Hydrobiologia 204-205 (1990), S. 513-519 
    Details
    ISSN: 1573-5117
    Keywords: fatty acids ; Gracilaria ; red algae ; seaweed
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Fatty acid composition, especially the distribution of eicosapolyenoic acids in several species of Gracilaria, was analyzed in relation to their taxonomy. The species have been grouped into two types based on distribution of these polyenoic acids: Type 1, which contains palmitic, oleic and arachidonic acids as the major components, and Type II, which contains eicosapentaenoic acid in addition to Type I fatty acids. Octadecapolyenoic acids were detected only in trace amounts in each Type. A similar remarkable difference also was observed in the fatty acid composition of lipid classes. The major component of eicosapolyenoic acids in Type I was arachidonic acid in all lipid classes. In Type II, eicosapentaenoic acid was the major component in monogalactosyl diacylglycerol, digalactosyl diacylglycerol, sulfoquinovosyl diacylglycerol and phosphatidylglycerol. Arachidonic and eicosapentaenoic acids were contained in large amounts in Type II phosphatidylcholine. Grouping of Gracilaria species into Type I and Type II is not entirely consistent with morphological and taxonomic features, but the difference in fatty acid composition is likely due to genetic rather than to environmental factors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00040279
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