排序方式： 共有6条查询结果，搜索用时 10 毫秒
1
1.
从红树林植物桐花树Aegiceras corniculatum的叶、叶脉、树皮、茎等4个部位, 湿季共分离到297株内生真菌, 干季共分离到232株内生真菌.叶片内生真菌优势类群为青霉属和盘长孢霉, 叶脉为青霉属和枝孢霉属, 树皮内生真菌中不产孢类所占比例最高, 而茎部的优势类群为枝孢霉属和短梗孢霉, 说明内生真菌的分布具有一定的器官和组织特异性.比较各部位内生真菌湿季类群和干季类群发现其优势类群也有一定的变化: 叶片内生真菌湿季优势类群是青霉属和盘长孢属, 而干季优势类群为不产孢类群B和C;叶脉、树皮、茎的内生真菌的优势菌群在湿季和干季也有差异.这说明不同季节的环境因素(降水量、气温、湿度、光照强度等)的变化对内生真菌的类群及其分布具有较强的影响. 相似文献
2.
枯草芽孢杆菌Bs-1拮抗溶藻弧菌的特性 总被引：1，自引：0，他引：1
研究了枯草芽孢杆菌Bacillus subtilis(Bs-1)抗菌物质产生的特点及培养液的无菌滤液的抗菌谱和理化性质,结果表明Bs-1生长快速,在5h内产生抗菌物质;该物质能抑制多种分离自养殖大海马Odobenus rosmarus肠道和海水的弧菌如溶藻弧菌Vibrio alginolyticus的生长;在一定范围内该物质对热、酸碱、变性剂和蛋白酶均有较好的稳定性。进一步尝试用Bs-1的含菌培养液来控制养殖海水中弧菌的数量,结果表明每升海水中加入4ml培养液(浓度为4×106CFU.ml?1)已能达到较好的抑菌效果;改变海水的pH和盐度,Bs-1培养液仍有较理想的抑菌作用。因此,Bs-1有望开发成良好的益生菌剂。 相似文献
3.
The Taixinan Basin is one of the most potential gas hydrate bearing areas in the South China Sea and abundant gas hydrates have been discovered during expedition in 2013. In this study, geochemical and microbial methods are combinedly used to characterize the sediments from a shallow piston Core DH_CL_11(gas hydrate free) and a gas hydrate-bearing drilling Core GMGS2-16 in this basin. Geochemical analyses indicate that anaerobic oxidation of methane(AOM) which is speculated to be linked to the ongoing gas hydrate dissociation is taking place in Core DH_CL_11 at deep. For Core GMGS2-16, AOM related to past episodes of methane seepage are suggested to dominate during its diagenetic process; while the relatively enriched δ18O bulk-sediment values indicate that methane involved in AOM might be released from the "episodic dissociation" of gas hydrate.Microbial analyses indicate that the predominant phyla in the bacterial communities are Firmicutes and Proteobacteria(Gammaproteobacteria and Epsilonproteobacteria), while the dominant taxa in the archaeal communities are Marine_Benthic_Group_B(MBGB), Halobacteria, Thermoplasmata, Methanobacteria,Methanomicrobia, Group C3 and MCG. Under parallel experimental operations, comparable dominant members(Firmicutes and MBGB) are found in the piston Core DH_CL_11 and the near surface layer of the long drilling Core GMGS2-16. Moreover, these members have been found predominant in other known gas hydrate bearing cores, and the dominant of MBGB has even been found significantly related to gas hydrate occurrence. Therefore,a high possibility for the existing of gas hydrate underlying Core DH_CL_11 is inferred, which is consistent with the geochemical analyses. In all, combined geochemical and microbiological analyses are more informative in characterizing sediments from gas hydrate-associated areas in the South China Sea. 相似文献
4.
深海环境通常具有高盐,高压,高/低温,无光照等特点,使得海洋微生物存在一套独特的生理代谢机制和分子细胞结构,然而迄今绝大部分深海微生物不能在实验室条件下被分离培养,深海微生物资源开发遇到很大挑战。本研究通过不依赖培养的方法研究海洋微生物的基因资源,构建了南海深海沉积物fosmid宏基因组文库,共获得约39 600个克隆,插入片段范围在24~45 kb之间,平均插入片段大小为33 kb,克隆片段的总库容达到1 320 Mb。通过功能筛选获得3个具有淀粉酶活性的克隆子,选取其中最适温度较低的amy7作为进一步研究对象。构建amy7插入片段的重组质粒文库,获得一个同样有淀粉酶活性的克隆子amy7-6。经测序,克隆子amy7-6含有3 291 bp插入片段,序列比对分析后发现其中一个大小为1 920 bp的ORF,其编码的蛋白质序列(AmyS)与各种来源的糖苷酶有着较高的相似性。 相似文献
5.
6.
1