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  • 1
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 187 (1960), S. 511-511 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Recently we have made a preliminary study of the carbohydrate components of Ecldonia radiata (Ag.) J. Ag., which occurs in the sub-littoral zone of the southern coasts of Australia. Fresh whole seaweed, collected in autumn at Point Lonsdale, Victoria, was milled through breaker plates in a Bauer ...
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  • 2
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 184 (1959), S. 288-289 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The dormant black carpenter ants (Camponotus pennsilvanicus pennsilvanicus var.) and their eggs found in Minnesota have now been shown to contain, in winter time, about 10 per cent of glycerol based on the weight of the dormant ants; the water content of the dormant ants was 55 per cent. ...
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  • 3
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 192 (1961), S. 1208-1208 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Samples were collected at Point Lonsdale, Victoria, each month during December, 1959-January, 1961. Each sample consisted of about twelve plants, which were dissected into laminae, midrib and'stipe. The 'midrib' was taken as that portion of the frond, comprising the elongation of the stipe, from ...
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  • 4
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 197 (1963), S. 203-204 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The work reported here represents an attempt to identify and to estimate quantitatively the major soluble carbohydrate substances of the carnbial zone of Eucalyptus regnans. Shortly after the vernal resurgence of cambial activity, the bark was stripped from freshly felled trunks of several ...
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  • 5
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 186 (1960), S. 374-375 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] PLANTS, in contrast with animals, do not possess JL well-defined organs for the excretion of potentially injurious metabolic products. However, it is obvious that means must exist whereby toxic substances are rendered non-toxic or, if toxic, are 'excreted' to locations within the plant where the ...
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  • 6
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 171 (1953), S. 792-792 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] White8 and Smith9 have shown, by different methods, that the acid hydrolysate from mesquite gum (an exudate from mesquite wood) contains 4-methyl-D-glucuronic acid residues. It has now been demonstrated that the acid hydrolysate from Eucalyptus regnans F. v. M. wood also contains ...
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  • 7
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 242 (1973), S. 479-480 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Samples were obtained by removing strips of bark from the stems of E. regnans trees and immediately scraping the exposed xylem and phloem surfaces. Each tissue sample was placed in a tared glass tube which was stoppered, weighed and partially immersed in a mixture of dry ice and ethanol. The ...
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  • 8
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Bark was stripped, at monthly intervals, from the stems of ten previously-unsampled trees of Eucalyptus regnans F. Muell. The exposed surfaces of inner phloem and outer xylem yielded phloem and cambial saps which were rapidly frozen. After freeze drying to determine the contents of water and dry-matter, the samples were extracted with 80% ethanol. The main components in this extract are low molecular weight carbohydrates and salts of inorganic acids. The carbohydrates comprise stachyose, raffinose, sucrose, galactinol, glucose, fructose, myo-inositol and galactose; sucrose is invariably the major component. The amounts of all components varied widely during the sampling period. Multiple regression analyses showed that season of growth has a significant effect on sucrose, glucose, fructose, total sugars and soluble dry-matter, maxima being recorded near the beginning of autumn and spring, and minima near the beginning of winter and summer; that oligosaccharide and myoinositol contents are significantly related to atmospheric temperature; and that rainfall has a significant effect on the hexose and total sugar contents, saps from the xylem surfaces being more affected than those from the phloem surfaces. The translocated photosynthates in E. regnans appear to be oligosaccharides of the raffinose family and sucrose. Significant negative correlations between oligosaccharides and both sucrose and myoinositol, and significant positive correlations between sucrose and both glucose and fructose, are consistent with enzymic hydrolysis and resynthesis of most di- and oligosaccharides. The biosynthetic demands of developing secondary tissues and/or the fluctuations in composition of sieve-tube assimilates appear to control the composition of the sugars in the saps. Oligosaccharides and sucrose may function as soluble reserve substances as well as translocated photosynthates. It is possible that myoinositolis a key component in the interconversion processes of the sugars; experiments with radioactive sugars tend to lend support to this contention, especially during winter conditions.
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  • 9
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary When cambial tissues are removed from tree stems of Eucalyptus regnans F. Muell. and incubated in vitro with [14C]glucose, [14C]galactose and [14C]fructose in the presence of sufficient PVP (polyvinylpyrrolidone) radioactive sucrose, members of the raffinose family and related sugars are synthesized. These results suggest that PVP inactivates substances which, in in vitro experiments, inhibit the action of enzymes which are essential to the resynthesis of nutrient sugars (sucrose, raffinose and stachyose). In living trees, such enzyme inhibition is less likely to occur.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Wood science and technology 3 (1969), S. 93-99 
    ISSN: 1432-5225
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zusammenfassung Die Infrarot-Spektren (4000...250 cm-1) dünner Holzchnitte (12μm) von einigen gefäßführenden Gymnosperment der Ordnung Gnetales, sowie von einem gefäßlosen Angiospermen der Familie Winteraceae zeigten mit Spektren von typischen Angiospermen — und nicht etwa mit denjenigen von Gymnospermen — eine große Ähnlichkeit. Diese Ergebnisse deuten darauf hin, daß die chemische Zusammensetzung einer bestimmten Holzart nicht durch deren anatomisches Gefüge bedingt ist; sie zeigen fernerhin, daß die Ordnung Gnetales chemisch den Angiospermen nahesteht.
    Notes: Summary Infrared spectra (4000...250 cm-1) of thin sections (12μm) of woods from some pored gymnosperms of the order Gnetales and of a non-pored angiosperm of the family Winteraceae have been obtained and found to resemble closely the spectra of typical angiosperms rather than gymnosperms. These results indicate that the gross chemical composition of a wood is not related to its anatomical structure and show that chemically the Gnetales resemble angiosperms.
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