In this study, the effects of algicidal substances from an algicidal bacterium Exiguobacterium sp. h10 on the toxic cyanobacterium, Microcystis aeruginosa 7820, were first investigated. The algicidal mode of action was confirmed as an indirect attack through the production of algicidal substances. The characteristics of the algicidal substance were determined, especially the functional groups analysis that confirmed the algicidal substances were glycolipid mixtures. With the stress of algicidal substances, the algal chlorophyll a synthesis, cell structure and morphology were seriously damaged. This study proved that algicidal bacteria are promising sources of potential cyanobacterial bloom-control, and provided good procedures for the identification and analysis of an algicidal bacterium and substances.

Amino group exhibits alkaline properties. Amino functionalized imidazole-modified silicas would benefit the adsorption of phenolic compounds. Coupling agent between the silica and the imidazolium ring has an effect on adsorption performance. In this paper, two adsorbents were synthesized for the surface bonding of N-(3-aminopropyl)-imidazole onto silicas modified by 3-chloropropyltriethoxysilane and 3-mercaptopropyltrimethoxysilane, respectively. Infrared spectra, elemental analysis, thermogravimetric analysis and N 2 adsorptiondesorption isotherms were used to characterize the two adsorbents, and their adsorption capacities of 2,4-dinitrophenol from aqueous solutions were investigated in detail. The experimental results indicated that amino group plays an important role in the enhancement of adsorption capacities of 2,4-dinitrophenol. The adsorbent with 3-mercaptopropyltrimethoxysilane as coupling agent exhibited lower adsorption capacity due to a weak electron-electron repulsion between the non-bonding electrons of sulfur atom and p electrons of benzene ring of 2,4-dinitrophenol. The adsorption kinetics fitted well with pseudo-second-order model. The two adsorbents could be regenerated and reused eight times at least by washing with HCl. The adsorption mechanism was also discussed.

azo compoundsazo compounds (diazo compounds, triazenes etc.) (benzene compounds) Q 0160 -088Using N-Bromosuccinimide and Pyridine as the Oxidation System to Prepare Carbonyl and Aryl Azo Compounds.-A new and simple method for the dehydrogenation of aryl-substituted semicarbazides (I) and carbazides (III) to the corresponding azo-compounds using NBS and pyridine as oxidation system is described. A possible mechanism of the reaction is given. -(WANG, Y.-L.; WANG, X.-Y.; LI, J.-P.; MA, D. L.; WANG, H.; Synth.

1998 azo compounds azo compounds (diazo compounds, triazenes etc.) (benzene compounds) Q 0160 01 -091 A Convenient, Rapid and New Catalyst Oxidation Method with KClO 3 /H 2 SO 4 /FeSO 4 for Preparing Aryl Azo Compounds. -The title methodology proceeds in one phase under mild conditions and uses cheap reagents. -(WANG, C.; WANG, Y.; WANG, X.; LI, J.; MA, D.; WANG, H.; Synth.