Of Western red cedar

Figure 86. The difference between the oxidativcly-hcating process, of 0.3 g of the sawdust of Western red cedar charged in the draft cell, into which air is supplied, and subjected to the adiabatic oxidatively-heating test started from a T, of 162.5 Tl, recorded until the temperature of the sawdust increases from 162.5 up to about 180 C, and, the process, of 0.3 g of the sawdust of the same kind charged in the draft cell, into which air is supplied, and subjected to the adiabatic oxidative y-heating lest started from a r,. of 173.5 recorded until the temperature of the sawdust increases from 173.5 up to about 200 C.

At all events, however, it will be reasonable, in practice, to consider a temperature 20 K lower than the value of Tc calculated herein for a sawdust heap, formed into the infinite slab above referred to and placed in the atmosphere under isothermal conditions, as the upper limit temperature for the safe handling of the sawdust. For instance, 100 °C will be the upper limit temperature for the safe handling of the sawdust of zelkova, 105 °C for that of Western red cedar, 110 °C for that of Douglas fir, and so forth. 

Now, if the sawdust of mixed hardwood is assumed to be in fact the sawdust of Western red cedar, the Tc for a sawdust heap of mixed hardwood, formed into a sphere, 82 cm in diameter, and placed in the atmosphere under isothermal conditions, which is cited in Table 21, is calculated at 134.8 °C, because the values of the variables, a, b, r, and apart from the constant, A T, in Eq. (79), are fixed for the sphere at 12574.6, -25.1238, 41, 0.16 and 3.32, respectively. The value of 7). thus calculated is in fair agreement with the value of 135 °C measured actually by Anthony et al. for the sphere [68]. Similarly, if the sawdust of Kiefemholz (German pine) is assumed to be in fact the sawdust of Douglas fir, the for a sawdust heap of Kiefemholz, formed into a sphere, 100 cm in diameter, and placed in the atmosphere under isothermal conditions, which is also cited in Table 21, is calculated at 131.8 °C, because the values of the variables, a, b, r, and apart from the constant, A T, in Eq. (79), are fixed for the sphere at 12489.87, -24.6042, 50, 0.14 and 3.32, respectively. The value of Tc thus calculated is in fair agreement with the value of 130 °C measured actually by John for the sphere [69, 70]. Once again, if the sawdust of Kiefemholz is assumed to be in fact the sawdust of Douglas fir, the Tc for a sawdust heap of Kiefemholz, formed into an infinite slab, 40 cm in thickness, and placed in the atmosphere under isothermal conditions, which is also cited in Table 21, is calculated at 139.0 °C, because the values of the variables, a, b, r, dfc and dc, apart from the constant, A T, in Eq. (79), are fixed for the infinite slab at 12489.87, -24.6042, 20, 0.14 and 0.878, respectively. The value of 7) thus calculated is in fair agreement with the value of 140 °C measured actually by John for the slab [69]. 

Avramidis etal. (1996) Mixture of western red cedar, western hemlock and amahilis fir, 71-152 mm thick 80 16 0.12... 

Southam, C. M., Erlich, J. (1943). Effects of extracts of western red-cedar heartwood on certain wood-decaying fungi in culture. 

Other phytochemicals which exhibit JH activity include juvadecene (1-(3,4-methylenedioxyphenyI)-fraws-3-decene) isolated from roots of the pepper-tree, Macropiper excelsum Miq. [110], thujic acid (5,5-dimethyl-1,3,6-cycloheptatrien-l-carboxylic acid) extracted from the heartwood of western red cedar, Thujaplicata [111] andtagetone((E)-2,6-dimethyl-5,7-octadien-4-one) from the marigold, Tagetes minuta L. [112], There have been numerous reports of juvenoid activity of plant extracts (Table 5) however, to our knowledge, the compound(s) responsible for this activity have not been isolated and characterized. 

Gardner JAF, Barton GM, Maclean H (1959) The Polyoxyphenols of Western Red Cedar Thuja plicata Donn.) 1. Isolation and Preliminary Characterization of Plicatic Acid. Can J Chem 37 1703... 

Plicatic acid (41), a lignan isolated from the heartwood of Western red cedar Thuja plicata D. Don) (Coniferae) was found to activate the classical pathway of complement. The mechanism by which this activation occurred was not completely defined at the molecular level, but appeared to involve interference with the control of active Cls in serum by Cl-In. By virtue of its ability to interfere with Cl-In in its inactivation of active Cl, plicatic acid might act as a protector of active Cl [26]. 

Anderson A B, Erdtman H 1949 L-Arabinose from heartwood of western red cedar (Thuja plicata). J Am Chem Soc 71 2927 - 2928... 

Fraser H S, Swan E P 1978 The chemistry of western red cedar bark. Can For Serv For Tech Publ 27, 17 pp... 

Swan E P 1966 A study of western red cedar bark lignin. Pulp Pap Mag Can 67 T456-T460... 

Mue S, Ise T, Ono Y, Akasaka K 1975 A study of western red cedar sensitivity workers allergy reactions and symptoms. Ann Allerg 35 148-152... 

Sowder A M 1929 Toxicity of water-soluble extractives and relative durabUity of water-treated wood flour of western red cedar. Ind Eng Chem 21 981-984... 

Barton G M, MacDonald B F 1971 The chemistry and utilization of western red cedar. Can For Serv Publ 1023 Ottawa, 16 pp... 

Research interests include wood chemistry, especially of western red cedar bark, leaves and wood heartwood formation especially of true firs bark adhesives HPLC analyses mill identification of lumber. 

H. S. Fraser and E. P. Swan, The chemistry of western red cedar bark. For. Tech. Publ. 27, Canadian Forest Service Vancouver,... 

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