Chlorococcum

About: Chlorococcum is a research topic. Over the lifetime, 268 publications have been published within this topic receiving 7317 citations.

Effect of Metribuzin and Two Analogs on Five Species of Algae

Abstract: Growth response of five species of soil algae to 4- amino-6-tert-butyl-3-(methyithio)-as-triaz in-5 (4H)one (metri- buzin) and its 6-isopropyl and 6-cyclohexyl analogs were studied in vitro. Species of Chlorella, Chlorococcum, Chlamy- domonas, and Anabaena were exposed to 0.05, 0.1, 0.5, and 1.0 ppm (w/v) of the herbicides in liquid nutrient, while a species of Schizothrix was studied at the same levels in soil culture. With one exception, the growth and numbers of all of the algae were significantly reduced by increasing herbicide concentrations. Anabaena was not affected by 0.05 ppm of the cyclohexyl analog. No growth was permitted by any of the herbicides at 1.0 ppm. Chlorella and Chlamydomonas could not grow in the presence of 0.5 ppm of metribuzin or the cyclohexyl analog. Differences in response to the triazi- nones were noted between species. Chlamydomonas was the most sensitive and Anabaena and Chlorella the most resistant.

Preparation of N-doped activated carbons with high CO2 capture performance from microalgae (Chlorococcum sp.)

Abstract: N-Doped activated carbons with high CO2 adsorption capacity have been prepared from sugar-rich microalgae (Chlorococcum sp.) feedstock via simple hydrothermal carbonization coupled with KOH activation or NH3 modification. The KOH activated carbons exhibit higher CO2 capture performance compared with the ones treated by NH3. The nitrogen-enriched hydro-char derived from microalgae was activated with KOH at 700 °C to improve the textural characteristics (surface area, pores size, and total pore volume), and the resulting carbon showed a highly ordered structure with a surface area of 1745 m2 g−1, and narrow pore size distribution with the maxima peak located in the micropore range (<1.0 nm). The activated carbon exhibited CO2 uptakes of 4.03 and 6.68 mmol g−1 at 25 °C and 0 °C, respectively. Further XPS analysis revealed the effective pyridonic-nitrogen species (up to 58.32%) on the carbon surface favored a higher CO2 capture capacity. The N-doped activated carbons displayed rapid adsorption kinetics with ultrahigh selectivity for CO2 over N2 (up to 11 at 25 °C), and no obvious decrease in the CO2 uptake capacity was observed even after seven cycles, which may be due to the dominant physisorption between CO2 and the surface of carbon.

Preliminary phycochemical analysis and in vitro antibacterial screening of green micro algae, Desmococcus Olivaceous, Chlorococcum humicola and Chlorella vulgaris

Abstract: Antibacterial activity of the Acetone, methanolic, ethanolic and DMSO extract of dried green microalgae Desmococcus olivaceous, chlorococcum humicola and chlorella vulgaris was assayed against five gram-ve (Klebsiella pneumoniae, Pseudomonas, Vibriocholerae, Streptococccus pyrogenes and Escherichia coli) and one gram +ve (Staphylococcus aureus) bacteria under culture conditions, using the agar disc diffusion technique. Incubation of the Mullar-Hinton agar plates for 24hrs. at 30°C, supplemented with the six test bacteria along with 50ml of acetone, methanolic, ethanolic and DMSO (Dimethyl sulphoxide) extract revealed inhibitory effect. The highest inhibition zone (25 mm& 21 mm ) was observed in acetone extract of Chlorococcum sp against gram +ve bacteria (Staphylococcus aureus) & gram -ve bacteria ( Escherichia coli). Preliminary phycochemical analysis was also performed on the dried algal sample by employing chemical methods and thin layer chromatography technique to assay the bioactive compounds which revealed the presence of seven principle bioactive compounds viz., phenolic, tannin, flavanoids, saponins, terpenes, carbohydrates & cardiac glycosides.

Composition and biosynthetic pathways of carotenoids in the astaxanthin-producing green alga Chlorococcum sp.

Abstract: The composition of the secondary carotenoids in the astaxanthin-producing green alga Chlorococcum sp. was analyzed. Eight types of carotenoids were identified by a variety of spectroscopic techniques. Canthaxanthin, 3′-hydroxyechinenone, adonirubin and adonixanthin comprised, respectively, 32%, 23%, 12% and 9% of total carotenoids. The results imply that Chlorococcum sp. synthesized astaxanthin from β-carotene through various pathways which are different from other astaxanthin-producing microorganisms.