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Tyromyces palustris 의 수산생성효소인 Oxaloacetase 와 목질 분해와의 관계 규명
오정수,이동흡,손동원 한국목재공학회 1996 목재공학 Vol.24 No.1
Brown rot fungus. Tyromyces palustras, has been reported to cause the loss of strength accelerated by oxalate. a non-enzymatic low molecular weight acid, with minute weight loss of decaying wood in early stage. The production of oxalate in relation to wood decaying and the presence of oxaloacetase, an oxalate producing enzyme, were identified during the process. Tyromyces palustris produced the largest, amount of oxalate among brown rot fungi. In order to find out the cleavage of pulp fiber, we submerged pulp fiber in oxalate solution and the results showed that the number of short pulp fiber was highly increased. compared with control solution. The pH of decaying wood was decreased to 1.77. which was close to that of saturated oxalate solution. pH 1.2. Thus. the oxalate was thought to be accumulated in the decaying wood. The oxaloacetase which accelerates production of oxalate was derived from fungus. and the production of oxalate by the enzyme was determined by using on UV/Vis spectrophotometer. Therefore, the oxalate was found to be produced by oxaloacetase during decay. The oxalate may cause the acid-hydrolysis of cellulose and hemicellulose. The oxalate was thought to reduce the degree of polymerization and increase the enzyme activity. which resulted in rapid loss of strength in early stage-an identical feature of brown rot fungus.
吳正洙,權玉載 건국대학교 1979 論文集 Vol.9 No.1
This study was carried out to know the suitable date of cone collection of Japanese ceder and Japanese cypress (Cryptomeria japonica and Chamaecyparis obtuse) in Jin-hae area. From the result of this test, several conclusion can be drawn. ① In Japanese ceder, the average germination ratio by date of cone collection was in order of 9/20=9/30, 10/10, 10/20. In Japanese cypress, It was in order of 9/20, 9/30, 10/10, 10/20. ② In Japanese ceder, as the storage period went on longer, germination ratio decreased. ③ The best results in this test are shown as follows: A.In Japanese ceder, after collecting in 20 th Sep., stored for three months in cold storage, and then one month in cold stratification. B.In Japanese cypress, after collecting in 20th Sep. and 30 th Sep., stored for three months in cold storage, and then one month in cold stratification.
백색부후균 생물 전처리에 의한 Kraft Pulp 화 특성
오정수,강규영,조병묵 한국목재공학회 2001 목재공학 Vol.29 No.4
Bio-kraft pulping of Populus alba×glandulosa pretreated with white-rot fungus, Phanerochaete chrysosporium KCCM 34740, was investigated The biopulping efficiency was evalued based on fungal pretreatment time and properties of bio-kraft pulp (pulp yield, freeness, WRV, kappa number and brightness) in comparison to the controls. Pretreatment of poplar wood chips with Phanerochiaete chrysosporium KCCM 34740 for 10days resulted in a some increase in screened yield (by 2%). According to increase of fungal incubation time, decrease in freeness (CSF) and increase in WRV were observed. And bio-kraft pulping also led to improvement of physical properties of handsheet. As a result of bio-beating effect, we expect the saving of chemicals in kraft cooking process and energy consumption in beating process.