Screening and Taxonomic Status of a Highly Efficient Antifungal Strain against Cytospora chrysosperma

In order to look for Trichderma strains which have inhibiting effects on Cytospora chrysosperma, total 29 domestic and foreign Trichderma strains were screened by confrontation culture and growth rate method. The physiological ecology characteristics and taxonomic statuses of the screened highly efficient antifungal strains were studied. The results showed that the n-butanol extract from T-33 fer- mentation liquid showed the highest inhibition rate （94.2%） against mycelial growth, and its inhibition rate against spore germination was up to 100%. For the growth of T-33 strain, the optimum carbon source was glucose with optimum content of 3% （g/L）; the optimum nitrogen source was soy four with optimum content of 0.02% （g/L）; the optimum initial pH of culture medium was 6; the optimum culture temper- ature was 25 ℃. The 18S rDNA sequencing results showed that the full length of ITS sequence was 583 bp, and the T-33 strain was verified as Trichoderma viride.

OSB表面饰面材料和单板柔化处理贴面技术

OSB表面凹凸不平,不美观,装饰材料市场难以接受,贴面饰面处理是解决此问题的有效方法。贴面涉及到二个材料密度大小差异、干缩性能和胶合性能,贴面材料本身的柔化处理也非常重要。研发过程中,采用砂光抛光套装处理整平后进行贴面,选择与基材粘和性能好的贴面材料是关键。选择市场上常见的水曲柳木皮、榆木皮、松木皮、科技木皮、山桂花、杨木皮、薄中纤板等7种材料,在处理后的OSB基材表面进行贴面装饰实验;采用三聚氰胺胶粘剂,通过涂胶湿润胶液扩散和热压蒸汽软化塑化贴面材料与基材,增加其胶合性能。结果发现科技木皮板面有空丝,平整度不好,有透胶现象,松木皮板面颜色偏差较大,水曲柳有少量鼓泡颜色变黄,三者甲醛含量均超过E0要求;杨木皮(单板)和薄型中纤板是处理后OSB基材表面贴面的较好材料,贴面后板面整体色泽一致,贴合好,平整度高,甲醛含量达到E0级内,表面胶合强度高。考虑经济成本,选择杨木皮和薄型中纤板作为OSB表面贴面增强材料,粘合性能好,之后再在此表面上加贴三聚氰胺装饰纸,制得高附加值OSB饰面产品,满足环保无醛装饰材料市场需求。