Pseudotsuga menziesii

From fir (Abies sp., Pseudotsuga menziesii) forest sprayed aerially with 140 or 280 mg/ha to control Douglas-fir tussock moth effects evaluated in year of spraying and 1 year later... 

Flavonol truxinix esters with possible myorelaxant activity were determined in Pseudotsuga menziesii using various TLC stationary and mobile phases. Because of chemotaxonomical interest the same investigations were carried out on 34 species from the family of Pinaceae. Dried and pulverized needles were exhaustively extracted with chloroform followed with methanol. The chloroform fraction was evaporated to 5 ml and... 

M. Krauze-Baranowska, I. Malinowska and J. Skwierawska, TLC of flavonol truxinic esters from Pseudotsuga menziesii. J. Plan. Chromatogr.—Mod TLC 15 (2002) 437 441. 

Dihydroflavonol 4-reductase (DFR EC 1.1.1.219) is a member of the short-chain dehydrogenase/reductase family and catalyzes the stereospecific conversion of (+)-(2R,3R)-dihydroflavonols to the corresponding (2R,3S,4S) flavan-3,4-cw-diols (leucoanthocyanidins), with NADPH as a required cofactor. The enzyme activity was first identified in cell suspension cultures of Douglas fir (Pseudotsuga menziesii) and was shown to be related to the accumulation of flavan-3-ols and proanthocyanidins [96]. Leucoanthocyanidins and DFR were later shown to be required for anthocyanidin formation by complementation of Matthiola incana mutants blocked between dihydroflavonol and anthocyanidin biosynthesis [97, 98], DFR has been purified to apparent homogeneity and biochemically analyzed from flower buds of Dahlia variabilis [99]. DFR was shown to accept different substrates depending on the plant species from which it was isolated (reviewed in 100). 

Marques, R., and J. Ranger. 1997. Nutrient dynamics in a chronosequence of Douglas fir (Pseudotsuga menziesii (Mirb,) Franco) stands in the Beaujolais Mounts (France). Forest Ecology and Management 91 255—277. 

Newton, M. and D.S. Preest (1988). Growth and water relations of Douglas-fir (Pseudotsuga menziesii) seedlings under different weed regimes. Weed Sci., 36 653-662. 

Douglas fir (Pseudotsuga menziesii) was chipped and screened to a relatively homogeneous chip size of approx 3 x 3 x 0.3 cm. The chips were initially impregnated with 4.5% (w/w) gaseous S02 and then steam exploded in a 1-L steam gun in batches of 50 g of dry chips at 195°C for 4.5 min, as previously described by Boussaid et al. (14). The steam-exploded wood samples of each batch were collected, combined, washed, and finally defibrillated on a refiner to produce a homogeneous feedstock. 

This paper is a report on preliminary studies evaluating the suitability of bark extracts from four West Coast softwood species as bonding agents for particleboard. The barks investigated include white fir (Abies concolor), ponderosa pine (Pinus ponderosa), Douglas fir (Pseudotsuga menziesii) and western hemlock (Tsuga heterophylla) ... 

To determine the distribution of lignin from bromine analysis, it is essential to know the reactivity of bromine toward lignin in different morphological regions. For black spruce (Picea mariana), Douglas-fir (Pseudotsuga menziesii) and loblolly pine (Pinus taeda), the lignin in the secondary wall of tracheids is 1.7... 

Table 4.4.1 gives the distribution of lignin in Douglas-fir (Pseudotsuga menziesii) earlywood tracheids (Saka and Thomas 1982). The overall lignin content (W) of the earlywood portion is 0.285 gig). The Klason and acid-soluble lignin determinations should be made on wood taken near the location from which the sections are collected for EDXA measurements. 

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