Showing papers on "Chlorococcum published in 2006"

Biology of a terrestrial green alga, Chlorococcum sp. (Chlorococcales, Chlorophyta), collected from the Miruksazi stupa in Korea

Abstract: A terrestrial chlorophyte, Chlorococcum sp., was isolated from the stone walls of Miruksazi stupa, which is a national treasure of Korea. The alga was one of the dominant organisms contributing to biodeterioration of the monument and it grew extensively on the walls of the inner room of the stupa, which had been sealed for more than 5 yr before we started this experiment. Chlorococcum survived in darkness during that time as dormant, warty, thick-walled spores. The resting spores revived in freshwater medium and released numerous unicellular progeny, which were isolated into a unialgal culture. The isolate was subjected to 18S rDNA phylogenetic analysis as well as ultrastructure and life cycle studies. In addition, the effect of salinity stress was investigated using sterile enriched seawater as a medium. Chlorococcum sp. grew in seawater culture medium for more than 5 mo and reproduced by aplanospores.

Removal Efficiency of Nitrogen and Phosphorus in Wastewater by Two Species of Algae

Abstract: By analyzing the concentration changes of nitrogen and phosphorus in experimental water,both a laboratory study and an outdoor experiment have been conducted for testing the removal efficiency of nutrients by algae.The test alga for the laboratory study is Chlorococcum sp.and for the field experiment is Cladophora oligoclona Kutz.respectively.The results show that Chlorococcum sp.grow quite well and have high removal rates of nitrogen and phosphorus in the sewage with very high concentrations of nitrogen and phosphorus.The removal rates of total soluble nitrogen,nitrate,ammonia and total soluble phosphorus from synthetic sewage were 46.2%,37.8%,98.4% and 79.3% in six days.The removal rate of total soluble phosphorus from crude lake water by the alga was 79.2% in five days.Cladophora oligoclona can grow normally and absorb relatively on nitrogen and phosphorus from the natural water in outdoor conditions.It plays an important role on reducing the specific conductance and improving the water quality.According to the results obtained in this study and referring to other relational research reports,both Chlorococcum sp.and Cladophora oligoclona have ability for removing nutrients from wastewater.Chlorococcum sp.is suitable for rehabbing and improving in static water and Cladophora oligoclona is suitable for treating and protecting in flowing water.