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31.
漆酶催化活性中心结构及其特性研究进展 总被引:22,自引:3,他引:22
漆酶是一种多酚氧化酶,参与木质素的降解或聚合,具有氧化木质素的能力,但不同来源的漆酶其氧化降解木质素的能力相差很大。漆酶的结构决定了漆酶的特性,因而也就决定了漆酶氧化降解木质素的能力。本文综述了近10年来漆酶分子催化活性中心的结构与功能及其特性的研究进展。 相似文献
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Phellinus torulosus was reported for the first time on Cupressus sempervirens in Tuscany, Italy. This fungus causes white rot in roots and stems and may also invade and kill the cortical tissue. The invasion of trees by the fungus and its subsequent spread is probably facilitated by fire scars. 相似文献
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Fibril angle variability in earlywood of Norway spruce using soft rot cavities and polarization confocal microscopy 总被引:4,自引:0,他引:4
Anna Bergander Jonas Br?ndstr?m Geoffrey Daniel Lennart Sahnen 《Journal of Wood Science》2002,48(4):255-263
The main purpose of this study was to investigate the variability of the fibril angle of tracheids in earlywood of Norway spruce (Picea abies L. Karst.). Polarization confocal microscopy was chosen and compared with the method utilizing the orientation of soft rot cavities. There was a significant correlation between the soft rot and polarization confocal microscopy methods, which showed the same trend of high fibril angles in the first part of the earlywood followed by a decrease toward the end of earlywood. This declining trend was less pronounced in annual rings containing compression wood. Moreover, large variations in fibril angle occurred between neighboring tracheids. The investigation also emphasized the differences between X-ray diffraction and microscopic methods, as the large variation seen by the latter methods is not seen by the X-ray diffraction approach because of its large area of measurement. No correlation was found between fiber morphology (i.e., average length, width, density) and the average fibril angle in the investigated annual rings. 相似文献
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采用不同药物及不同时间处理牛肋巴地板木开展牛肋巴地板木防蛀、防腐、防变形的试验研究 ,结果表明 :通过不同药物和不同时间处理下防蛀、防腐、防变形特性存在明显差异 ,0 .3%高锰酸钾药液浸泡 9d能显著提高牛肋巴地板木防蛀、防腐、防变形的性能 ,而且牛肋巴地板木的纹理自然清晰美观。分别使用 0 .3%的敌百虫、石灰水和多菌灵药液 ,虽能提高其防蛀、防腐、防变形特性 ,但致使地板木变黑。 相似文献
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申嗪霉素对油菜菌核病菌生物学活性的初步研究 总被引:3,自引:3,他引:0
申嗪霉素是一种新型微生物源杀菌剂,主要成分为吩嗪-1-羧酸。测定了申嗪霉素对油菜菌核病菌菌丝生长的抑制作用。结果表明,申嗪霉素对油菜菌核病菌51个菌株菌丝生长的平均有效抑制中浓度(EC50值)为3.31±0.77 μ g/mL,并且与常规杀菌剂多菌灵、菌核净无交互抗性关系。离体叶片和田间药效试验表明,申嗪霉素对油菜菌核病的防治效果随其处理剂量增加而提高,用有效成分200 μ g/mL药液处理时,抑制离体叶片发病的效果可达到67.08%,田间防效可达83.29%,优于对照药剂异菌脲。 相似文献
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BACKGROUND: Rhizobacteria have a good potential to suppress soilborne diseases, but their efficacy against sugarcane pests is rarely reported. Bacterial strains isolated from the rhizosphere of sugarcane were evaluated for their potential to suppress red rot disease on two susceptible varieties, Co‐1148 and SPF‐234, under field conditions. The strains were also characterised for the production of secondary metabolites associated with their antagonistic activity. RESULTS: One out of four strains, the Pseudomonas putida strain NH‐50 (EU627168), reduced disease severity by 44–60% in different field trials. This potent antagonistic strain produced pyoluteorin antibiotic, as confirmed by high‐performance liquid chromatography (HPLC). The PltB gene involved in pyoluteorin synthesis was amplified from the P. putida strain NH‐50 and sequenced. The extracellular metabolites and volatile and diffusible antibiotics secreted by the tested strains inhibited mycelial growth of Glomerella tucumensis (Speg.) Arx & E Mull in vitro by 7–55%. CONCLUSION: The pyoluteorin‐producing bacteria P. putida strain NH‐50 significantly reduced disease severity on both sugarcane varieties, irrespective of fungal inoculation, i.e. either inoculated through stem or through soil. This strain also possesses other plant growth characteristics and can be used as a biopesticide for sugarcane crop. Copyright © 2011 Society of Chemical Industry 相似文献