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| 1 | 溶藻菌N25的筛选及溶藻效果观察显示文摘目的筛选高效溶藻菌,初步观察其对铜绿微囊藻的溶藻效果。方法从处理生活污水的活性污泥中分离菌株,将其接种至微囊藻培养液中,通过观察培养液颜色和藻细胞数量的变化,初步筛选出溶藻菌。重复上述过程3次,并用溶藻率来初步评价其溶藻效果,获得较为高效的溶藻菌。用PCR的方法,对高效菌株的16S rDNA进行测序并与GeneBank对比,鉴定其种属。运用透射电子显微镜观察藻类在溶藻菌作用下48 h内发生的形态学变化,证实溶藻效果。结果从活性污泥中分离得到一株高效溶藻菌,命名为N25-2(以下简称为N25)。经过16S rDNA鉴定,该菌与芽孢杆菌(Bacillus SP.)或纺缍形赖氨酸芽孢杆菌(Lysinibacillus fusiformis)的匹配度均为99%。当培养液中藻的数量达到1×106个/mL,细菌的数量达到1×106 cfu/mL时,在48 h内,该菌的溶藻率达到72%以上。透射电子显微镜观察发现,经过N25处理后,微囊藻出现空泡增加,多面体深染,藻胆体增加,质壁分离和内部结构破坏等形态学改变。结论 N25具有较好的溶藻效果,能诱导微囊藻出现多种形态学改变,其溶藻机制可能是细菌分泌物导致藻类细胞死亡所致,但需进一步研究证实。 | 邱雪婷 钱雨婷 周韧 周义军 王艳 谭佑铭 | 2011 | 上海交通大学学报(医学版)2011，31，10： | 8 |
| 2 | 基于抗生素敏感性构建索罗金小球藻异养无菌体系的研究显示文摘为构建索罗金小球藻(Chlorella sorokiniana FZU60)的异养无菌体系,对其共生菌进行分离和鉴定,并考察了8种常见抗生素(头孢噻肟、卡那霉素、新霉素、氨苄青霉素、链霉素、四环素、氯霉素和红霉素)对共生菌和藻株FZU60生长的影响。结果表明:异养体系中主要的共生菌为芽孢杆菌(Bacillus)(78.76%)和甲基杆菌(Methylobacterium)(3.14%),且10 mg/L头孢噻肟、10 mg/L四环素、100 mg/L卡那霉素和100 mg/L红霉素对这两株共生菌均具有较好抑制效果,但对藻株FZU60的生长无明显影响。在此基础上,进一步考察了不同抗生素组合对藻株FZU60异养共生菌的抑制效果,发现采用10 mg/L头孢噻肟、10 mg/L四环素和100 mg/L卡那霉素的抗生素组合可成功构建异养无菌体系,且经3次传代培养后藻株FZU60仍可维持稳定的生长及无菌状态。本实验结果可为索罗金小球藻高密度异养中无菌藻种的制备提供一定的理论参考和实验依据。 | 蔡伟鑫 刘心宇 马瑞娟 陈剑锋 谢友坪 | 2023 | 食品工业科技2023，44，12： | 0 |
| 3 | Screening and isolation of the algicidal compounds from marine green alga Ulva intestinalis显示文摘Twenty species of seaweed were collected from the coast of Zhejiang, China, extracted with ethanol, and screened for algicidal activity against red tide microalgae H eterosigma akashiwo and Prorocentrum micans. Inhibitory eff ects of fresh and dried tissues of green alga U lva intestinalis were assessed and the main algicidal compounds were isolated, purifi ed, and identifi ed. Five seaweed species, U. intestinalis, U. fasciata, Grateloupia romosissima, Chondria crassicaulis, and Gracilariopsis lemaneiformis, were investigated for their algicidal activities. Fresh tissues of 8.0 and 16.0 mg/m L of U. intestinalis dissolved in media signifi cantly inhibited growth of H. akashiwo and P. micans, respectively. Dried tissue and ethyl acetate(Et OAc) extracts of U. intestinalis at greater than 1.2 and 0.04 mg/m L, respectively, were fatal to H. akashiwo, while its water and Et OAc extracts in excess of 0.96 and 0.32 mg/m L, respectively, were lethal to P. micans. Three algicidal compounds in the Et OAc extracts were identifi ed as 15-ethoxy-(6z,9z,12z)-hexadecatrienoic acid(I),(6E,9E,12E)-(2-acetoxy- β- D-glucose)-octadecatrienoic acid ester(II) and hexadecanoic acid(III). Of these, compound II displayed the most potent algicidal activity with IC_(50) values of 4.9 and 14.1 μg/m L for H. akashiwo and P. micans, respectively. Compound I showed moderate algicidal activity with IC_(50) values of 13.4 and 24.7 μg/m L for H. akashiwo and P. micans, respectively. These fi ndings suggested that certain macroalgae or products therefrom could be used as ef fective biological control agents against red tide algae. | 孙雪 金浩良 张琳 胡伟 李亚鹤 徐年军 | 2016 | Chinese Journal of Oceanology and Limnology2016，34，4： | 0 |
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