Screening of marine fungus from Nanji Island and activity of their metabolites against pathogenic Vibrio from Pseudosciaena crocea

Seventy-eight marine fungal strains were isolated from sediment samples collected off the coast of Nanji Island,Wenzhou,Zhejiang Province,China.Antibacterial screening using the agar disc method showed that 19 of the isolated strains could inhibit at least one pathogenic Vibrio from Pseudosciaena crocea.Subsequent screening confirmed that nine strains produced antibacterial metabolites that had activity against one or several types of pathogenic Vibrio.Strain NJ0104 had the widest antimicrobial spectrum and strong activity,particularly against Vibrio parahaemolyticus-MM0810072.A preliminary study of NJ0104 antibacterial metabolites demonstrated that they had thermal stability up to 80°C,ultraviolet stability up to 40 min and pH stability between 4.0-7.0.In addition,the antibacterial metabolites were readily soluble in butanol.To identify the specific strain,the ITS-5.8S rDNA regions of NJ0104 were PCR amplified and sequenced.Based on the combination of phenotypic and genotypic data,the strain was identified as Arthrinium sp.     

希尔伯特-黄变换在地震资料处理中的应用

希尔伯特-黄变换是最新发展起来的处理非线性非平稳信号的时频分析方法.本文介绍了该方法的基本原理和几个关键技术,以及其优势所在,并将它应用于含随机噪音的地震信号和实际地震资料的分解.分解后的信号能够重构原始信号,重构后在信噪比和分辨率方面有了一定的提高,对地震资料的去噪有重要意义.     

南麂岛海洋沉积物抑菌真菌的筛选及其代谢产物特性的初步研究

以7种水产病原菌为指示菌,采用菌饼法对分离自南麂岛海域的15个沉积物样品中的78株海洋真菌进行抑菌活性初筛,获得了对至少一种病原指示菌有抑菌活性的菌株19株.采用打孔扩散法对这19株真菌的发酵液进行抑菌活性复筛,共有9个菌株的次级代谢产物对一种或者几种病原指示菌有抑制作用,其中菌株NJ0104的次级代谢产物对除灿烂弧菌...     

基于地震资料有效信息约束的深度网络无监督噪声压制方法

地震资料处理是地震勘探中的关键环节,由于地下构造和地表条件的复杂性,地震资料的处理需要经过一系列复杂流程,从而形成多种不同类型的地震数据.不同种类的地震数据具有不同的数据特征,充分利用和发掘其中的数据特征,不仅可以充分发挥处理方法的技术潜力,消除各类非地质因素对地震资料处理质量的影响,同时可以增强地震资料处理的可靠性,...