|
1. |
BIOLOGICAL DECOMPOSITION OF CHEMICAL LIGNIN: I. SULPHITE WASTE LIQUOR |
|
Canadian Journal of Research,
Volume 20c,
Issue 1,
1942,
Page 1-12
G. A. Adams,
G. A. Ledingham,
Preview
|
PDF (744KB)
|
|
摘要:
The wood staining fungusEndoconidiophora adiposawas found to be capable of decomposing approximately 10% of the lignin fraction of sulphite waste liquor media as measured by the β-naphthylamine precipitation method. It was also capable of utilizing 10 to 15% more of the reducing sugars than yeast. In the preparation of a suitable culture medium a number of different neutralizing agents were tested but, provided the proper pH adjustment was attained, there was little difference in their effect. Phosphate and nitrogen compounds were the only supplementary nutrients required and, for the fungus tested, organic and ammonia nitrogen was more satisfactory than inorganic nitrates.
ISSN:1923-4287
DOI:10.1139/cjr42c-001
出版商:NRC Research Press
年代:1942
数据来源: NRC
|
2. |
BIOLOGICAL DECOMPOSITION OF CHEMICAL LIGNIN: II. STUDIES ON THE DECOMPOSITION OF CALCIUM LIGNOSULPHONATE BY WOOD DESTROYING AND SOIL FUNGI |
|
Canadian Journal of Research,
Volume 20c,
Issue 1,
1942,
Page 13-27
G. A. Ledingham,
G. A. Adams,
Preview
|
PDF (875KB)
|
|
摘要:
The growth and lignin decomposing properties of 106 cultures of wood destroying and soil fungi have been studied on a synthetic calcium lignosulphonate medium. Certain species ofFusariumandAlternaria, decomposing a maximum of 12 and 18% lignin, respectively, were the most effective in utilizing the lignosulphonate. Although a few species of wood destroyers were equally effective, in general this group of fungi showed great variation and was more difficult to cultivate on the medium employed. A slight positive correlation was found between the Bavendamm tannic acid reaction for identifying lignin decomposing fungi and the lignosulphonate breakdown after 60 days' growth.
ISSN:1923-4287
DOI:10.1139/cjr42c-002
出版商:NRC Research Press
年代:1942
数据来源: NRC
|
3. |
STUDIES ON THE RELATION OF GROWTH RATE TO WOOD QUALITY INPOPULUSHYBRIDS |
|
Canadian Journal of Research,
Volume 20c,
Issue 1,
1942,
Page 28-40
L. P. V. Johnson,
Preview
|
PDF (750KB)
|
|
摘要:
Experiments were conducted on the relation of growth rate to wood quality in a series of 43 hybrid and parental trees, which involvedPopulus alba,P.grandidentata, andP.tremuloides.Fibres in fast growth annual rings were longer on the average than those in slow growth rings from the same tree. In single annual rings, fibres of early wood were shorter and thicker than those of late wood.Average fibre diameter of individual trees was significantly correlated in a positive manner with growth rate, but the correlation between fibre length and growth rate was well below the level of significance.Short, thick habit of growth was significantly correlated with high density of wood, but correlations between growth rate (in terms of annual increment in volume) and wood density were insignificant.Experimental pulp and paper tests did not reveal any very striking differences in quality between fast growing hybrid and slow growing parental trees, although there remains some doubt as to the suitability of abnormally fast growth hybrid wood for some of the higher grades of soda pulp paper.The general, and tentative, conclusion is that the investigation revealed nothing to indicate that rapid growth is seriously detrimental to wood quality.
ISSN:1923-4287
DOI:10.1139/cjr42c-003
出版商:NRC Research Press
年代:1942
数据来源: NRC
|
4. |
THE DEVELOPMENT AND STRUCTURE OF THE CONIDIA OFERYSIPHE POLYGONIDC. AND THEIR GERMINATION AT LOW HUMIDITY |
|
Canadian Journal of Research,
Volume 20c,
Issue 1,
1942,
Page 41-61
Harold J. Brodie,
C. C. Neufeld,
Preview
|
PDF (1349KB)
|
|
摘要:
The germination of the conidia ofErysiphe PolygoniDC. takes place through a range of relative humidity from approximately zero to 100% and, therefore, independently of the moisture content of the surrounding atmosphere. In germinating thus, they differ from the spores of some other erysiphaceous fungi and of non-erysiphaceous fungi in general.InE.Polygoni, the conidium is cut off from the conidiophore by a ring of wall material which is added to inwardly until a perforate disk is formed. Later, the pore is closed and the mature conidium remains attached to its conidiophore only by a minute papilla. The conidia have never been observed to germinatein situ, and they are passively discharged.The conidium wall is relatively impervious to water, stain passing into the spore only at the papillate end. Assuming the wall to be relatively impervious to gases also, an explanation is offered for the mechanism of germination of the conidia when they are dislodged from their conidiophores and allowed to fall on dry slides. The papilla provides a permeable spot in the spore wall. It is not exposed until after the spore has been detached. Upon exposure to air, the papilla allows carbon dioxide to pass out from the protoplast and oxygen to pass in, causing respiration and other germination processes to begin.Evidence in support of this suggestion is presented. When freshly detached conidia were held in an atmosphere containing 10% carbon dioxide, germination was checked. These conidia germinated perfectly when removed from the carbon dioxide. Germination was similarly checked by holding the spores in an atmosphere of nitrogen.No shrinkage of the conidia during germination was observed, but shrivelling and collapse take place when death is imminent.
ISSN:1923-4287
DOI:10.1139/cjr42c-004
出版商:NRC Research Press
年代:1942
数据来源: NRC
|
|