Lentinus lepideus

The relationship of the dicarboxylic amino acids, aspartic and glutamic acids to this process has also been studied (106). This investigation has been facilitated by a quantitative method for the codetermination (23) of the dehydrogenation indicator, resazurin, and its reduction product, resorufin. The wood destroying molds used were Trameles cinnabarina and Lentinus lepideus. 

Lentinus lepideus, and the chemical effects of decay of the wood by the mold were progressively followed by periodic analyses of the resulting wood residues. The results of this decay are presented in Table 2. 

Table 2. The Effect of Decay by Lentinus lepideus on the Chemical Composition of White Scots Pine (98).

Native Lignin Poria vaillantii Polyporus sulfureus Lentinus lepideus... 

Methyl p-Methoxycinnamate Formation by Lentinus lepideus and its Significance in Lignification. Arch. Biochem. 14, 465 (1947). 

Lentinus lepideus (5). Interestingly, PAL is absent from both bacterial and animal kingdoms. 

Figure 3. Relationship between secondary metabolite production, consumption of nitrogen and carbon sources, and growth of the brown-rot fungus Lentinus lepideus (HC-LN medium).

Douglas-fir, birch, southern pine, and sweetgum blocks were treated with 1% aqueous ammonia or sodium hydroxide for various times, temperatures, and pressures (9). These samples were submitted to soil-block tests with two brown-rot fungi Poria monticola (Madison 698) and Lentinus lepideus (Madison 534) and two white-rot fungi Polyporus versicolor (Coriolus versicolor) (Madison 697) and P. anceps (F 784-5) as well as outside exposure tests (10). In the soil-block tests, the treated wood was resistant to the two brown rotters, but was not resistant to the two white rotters. In the outdoor stake tests, the average lifetime was 3.5 years while untreated controls had an average lifetime of 3.6 years. The outdoor tests show that there is no increase in rot resistance by this treatment. 

The alteration in the porous structure of the wood cell wall as a result of the inqrregnation and toe ageing procedures, as well as after toe action of fungi (Coniophora puteana and Lentinus lepideus) was investigated by the water vapours sorption method. 

Distinctions in the destructive action of Coniophora puteana and Lentinus lepideus have been established from the viewpoint of structure, the activity of Lentinus lepideus relative to impregnated wood is more than twice that in the case of Coniophora puteana. After the leaching procedure (EN 84), the destructive action of Coniophora puteana increases dramatically, while the structural characteristics of leached samples upon contacting with Lentinus lepideus are not practically changed. 

There are many mushrooms that cau grow ou wood. Typically, they are uot used for quautitative testiug, except of Lentinus lepideus (Fig. 13.6), which is recommended by ASTM D 1413 (see above) for the determination of the effect of fungi on the properties of wood, as it is particularly tolerant to creosote. It apparently does not provide a particular iuterest iu testing WPC materials. 

Figure 13.6 Lentinus lepideus (image provided by the Illinois Mycological Association, with permission).

Eburicoic acM. Formula, see eburicol C3,H,o03> Mr 470.74, needles, mp. 293 °C, [a][, -b34° (pyridine). Widely distributed Cji-triterpene carboxylic acid with eburicane skeleton from wood-rotting fungi such as Fames officinalis, Lentinus lepideus, Gloeophyllum sp., Polyporus sp. and other Aphyllophorales. E. is formed biosynthetically from eburicol that occurs in many fungi. 

Coniophora cerebella Tyromyces palustris Setpula lacrymans Lentinus lepideus Chaetomium globosum... 

Four lignans (conidendrin, isoolivil, pinoresinol, and matairesinol) were tested against several decay fungi (42, 43) and were generally nontoxic. Lentinus lepideus was inhibited by 1.0% of pinoresinol or matairesinol but was unaffected by the other compounds. Lignans often are produced by Picea or Pinus in response to... 

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