[Effects of Algicidal Substance on Phaeocystis globosa and Its Fatty Acids by the Simulation Experiment].

In order to evaluate the effects of algicidal substance on Phaeocystis globosa (P. globosa) and its algal toxin-fatty acids, the changes of chlorophyll-a, pH, dissolved oxygen, permanganate index and N, P concentration were evaluated by the simulation experiment. Fatty acids composition in P.

[Characteristics study of extracellular active substance of Bacillus sp. B1 on Phaeocystis globosa].

The algicidal bacterium named B1 which was identified as Bacillus sp. was isolated from red tide water in Xiangzhou shipside of Zhuhai. The algicidal mode of algae-lysis bacterium B1 and the microstructure of algal cells in the algae-lysing process were studied.

[Isolation and characterization of two marine algicidal bacteria against the Phaeocystis globosa].

The algae-lysis bacteria Y01 and Y04 were isolated from seawater, during a red tide survey of the Zhuhai Estuary in southern China. The algae-lysis bacteria Y01 and Y04 were Gram-positive bacteria which can remove P. globosa in 6 days.

NMR spectral assignments of two sterols from a soft coral Sinularia brassica.

Two new steroids, named 4α,22-dimethyl-Cholest-22-en-3β-ol (1) and 4α-methyl-Cholest-7,22-dien-3β-ol (2), along with two known steroids, were isolated from the soft coral Sinularia brassica. The structures of the new compounds were determined on the basis of extensive spectroscopic data (MS, (1)H and (13)C NMR, (1)H-(1)H COSY, (13)C-(1)H COSY, HMBC and NOESY) analysis.

[Sodium dichlorinated isocyanuric acid and trichloroisocyanuric acid for removing cells of Phaeochystis globosa].

Removal and control of Phaeochystis globosa cells by sodium dichlorinated isocyanuric acid and tri-chloroisocyanuric acid were studied. Removal efficiency of the two algaecides was contrasted and removal mechanism was also discussed. The results suggest both of the algaecides have excellent ability to remove and control Phaeochystis globosa cells.