Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Eucalyptus regnans

Despite indications (from analytical data) that a monomethyl ether of a uronic acid occurs in the hydrolyzates of several polysaccharides, definite evidence for the presence of 4-O-methyl-D-glucuronic acid did not appear until 1948, when White found it in mesquite-gum hydroly-zate.14 Confirmation of its presence therein has since13 appeared, and it has also been found in the hydrolyzates from gum myrrh,6 aspen wood,14 and Eucalyptus regnans wood.16... [Pg.134]

McNaughton JG, Yean WO, Goring DAI (1967) Macromolecular properties of kraft lignins from spruce made soluble by a continuous flow process Tappi 50 548-553 Michell AJ, Watson AJ, Higgins HG (1965) An infrared spectroscopic study of deligmfication of Eucalyptus regnans Tappi 48 520-532... [Pg.60]

Bland DE, Sternhell S (1965) Estimation of aromatic protons in methanol lignins of Pinus radtata and Eucalyptus regnans from proton magnetic resonance spectra Aust J Chem 18 401-410... [Pg.248]

Eucalyptus regnans is the classic example of a eollapse-prone timber. Once eonsidered suitable only as fuelwood, today it is in demand for flooring, furniture and in other prestige items. Collapse-prone timbers inelude eertain other eucalypts, oak (Quercus sp.), black walnut Juglans nigra), western red eedar Thuja plicata) and redwood Sequoia sempervirens). [Pg.289]

Hardwoods Alder Beech Birch Poplar, black Ramin Elm Eucalyptus regnans Obeche Seraya, white Kerning Sapele Seraya, red Sepetir Kempas Meranti Oak Afrormosia Iroko Teak... [Pg.304]

A Michell, PJ Nelson, and CWJ Chin. Diffuse Reflectance Spectroscopic Studies of the Bleaching and Yellowing of Eucalyptus regnans Cold Soda Pulp. Appita 42 443-448, 1989. [Pg.99]

Hemmingson, J. A. (1985) Structural aspects of lignins from Eucalyptus regnans wood steam exploded by the lotech and Siropulper processes. J. Wood Chem. Technol. 5(4), 513-534. [Pg.244]

Bird and Ritter isolated, from wood of white oak, a chlorine holocellu-lose which contained all of the 0-acetyl groups present in the wood. Mitchell and Ritter later extracted a chlorine holocellulose from sugar maple with water and obtained a xylan in a yield of 3.4% of the wood. This polysaccharide contained 9.2% of 0-acetyl groups. A xylan which had been obtained in the same way, from aspen, by Wise and Jones, was, on treatment with periodate, oxidized almost to completion. When the wood itself was similarly treated, most of its xylan escaped oxidation. Although it appears evident that all of the xylan in the wood could not possibly have been accessible to the aqueous reagent, it was concluded that the lack of oxidation was most probably due to the fact that the native xylan was partly 0-acetylated. After treatment of wood from Eucalyptus regnans with methanol at 150°, Stewart and coworkers obtained, on extraction with water, a xylan (in a jdeld of 3.7%) which contained 5-6% of acetate... [Pg.274]

Polglase, P.J., Attiwill, P.M. and Adams, M.A. (1992) Nitrogen and phosphorus cycling in relation to stand age of Eucalyptus regnans F. Muell. III. Labile inorganic and organic P, phosphatase activity and P availability. Plant and Soil 142,... [Pg.182]

In studies of the decomposition of sawdusts in soils at 78°F., McKenzie (1958) observed that the maximum amounts of nitrogen taken up by mountain ash (Eucalyptus regnans F. Muell), red ironbark (Eucalyptus sideroxylon A. Cunn) and radiata pine (Pinus radiata D. Don) were 1.6, 1.4 and 1.0% respectively. He states that it is possible that these amounts are inversely related to degree of lignification of the wood, and this would account for softwoods causing less uptake than eucalypts, and a dense eucalypt less uptake than a less dense one. Maximum uptake was reached in 5-11 weeks and the immobilized nitrogen was released very slowly over a period of many weeks. [Pg.431]

Infrared spectra in the O—H and C=0 stretching regions of lignin model compounds and of lignins isolated in various ways from Eucalyptus regnans F. Muell. [Pg.518]

Although the tallest recorded individual trees are no longer standing, scientists determined from taper formulas calibrated on shorter, living specimens that the tallest flowering plant. Eucalyptus regnans, a hardwood tree in southeast Australia, can reach 120 meters. [Pg.811]

Stewart C M, Melvin J F, Ditchburne N, Tham S H, Zerdoner E 1973 The effect of season of growth on the chemical composition of cambial saps of Eucalyptus regnans trees. Oecologia 12 349-372... [Pg.178]

The color changes that occur in a species are not always uniform. Normally the groundwood billets from logs of Eucalyptus regnans and E. delegatensis are cream in color. However, logs from variants of these species when cut open become pink or red within a few minutes and after a few days become dull brown and darker in color than the normal billets. The changes could be due to the presence of proanthocyanidins. [Pg.886]


See other pages where Eucalyptus regnans is mentioned: [Pg.158]    [Pg.172]    [Pg.146]    [Pg.248]    [Pg.88]    [Pg.139]    [Pg.278]    [Pg.268]    [Pg.237]    [Pg.274]    [Pg.157]    [Pg.159]    [Pg.160]    [Pg.161]    [Pg.875]    [Pg.897]    [Pg.922]    [Pg.367]    [Pg.146]    [Pg.441]   
See also in sourсe #XX -- [ Pg.157 , Pg.159 , Pg.160 , Pg.875 , Pg.886 , Pg.897 , Pg.922 ]

See also in sourсe #XX -- [ Pg.367 ]




SEARCH



Eucalyptus regnans F. Muell

© 2024 chempedia.info