Cyanobacterial crude extract

Cyanobacterial blooms often consist of mixtures of microcystin-producing and microcystin-free species, and both can cause unpredictable effects on aquatic organisms. In this work, the subchronic effects of the cyanobacterial crude extracts (CCEs) from microcystin-producing and microcystin-free cyanobacteria with different microcystin concentrations (1, 10, and 50 µgL−1)on Daphnia magna were investigated. The life-history trait responses of D. magna to CCEs were determined based on survival, reproduction, and somatic growth.

10p dolomite36 30-12-2021 9 0   Download

Develop the process of producing crude extracts, fractions and pure chemical compounds isolated from E. fortunei; tudy of inhibitory effect of the crude ethanol extracts from E. fortunei on the growth of M.aeruginosa and evaluating their ecological safety to non-target aquatic organisms.

28p larachdumlanat129 20-01-2021 15 3   Download

This study is aimed to examine whether the presence of non-toxic filamentous cyanobacteria can cause toxic effects on Daphnia magna. Six strains of Oscillatoria perornata were isolated from the Tri An Reservoir and cultured in our laboratory for investigation. The results revealed that all strains were negative with the mcyA moleculer marker.

10p angicungduoc7 09-09-2020 23 1   Download

Harmful cyanobacterial blooms have become a global threat to human health and aquatic biota around the world. While the ecotoxicity of cyanobacterial toxins such as microcystins (MCs) has been studied extensively, the toxicity of non-toxin producing cyanobacteria has not been evaluated to the same extent. In this study, five strains of Microcystis wesenbergii were isolated from the Tri An reservoir and cultured under laboratory conditions. Microscopic observation was used for morphological identification. The MCs concentration was measured by highperformance liquid chromatography (HPLC).

6p chauchaungayxua2 07-01-2020 36 1   Download

Microcystis is a bloom-forming, common cyanobacterium in Dau Tieng reservoir used for public water supply. To assess the presence of potentially microcystin-producing Microcystis, molecular techniques were conducted and acute toxicity bioassays were performed with the microcrustacean Daphnia magna exposed to cyanobacterial crude extracts. Potentially toxigenic of isolated strains was characterized by amplifying mcyD genes and identification of Microcystis was confirmed by 16S rRNA amplification.

8p viathena2711 08-10-2019 12 0   Download

The differential accumulation of endogenous flavonoids was recorded in soybean (G. max (L.) Merr. cv. “Nam Dan”) under infestation of cowpea aphid (Aphis craccivora Koch) and/or treatment of the crude extract of cyanobacterium strain Nostoc calcicola HN9-1a. During A. craccivora infestation, flavonoids in the aphid-infested leaves were strongly induced to high contents, which were 1.84–2.21 - fold higher than that observed in control.

7p cumeo3000 01-08-2018 25 0   Download