Showing papers on "Chlorococcum published in 1971"

GROWTH INTERACTIONS BETWEEN CHLAMYDOMONAS GLOBOSA SNOW AND CHLOROCOCCUM ELLIPSOIDEUM DEASON AND BOLD UNDER DIFFERENT EXPERIMENTAL CONDITIONS, WITH SPECIAL ATTENTION TO THE ROLE OF pH

Abstract: ARSTRACT The influence of Chlamzjdomonas glohosa and Chlorococcum ellipsoideum on each other’s growth was studied with two diffcrcnt cxperimcntal techniques. The first is a newly developed filter culture method in which two separate cultures of different species are connected via a filtering system through which medium is exchanged while the cells themselves are kept separate. Under these circumstances Chlorococcum in’hibits the growth of Chlumydomonus but not vice versa. In the second technique, traditional luixcd cultures, Chlorococcum inhibits Chlumydomonus only in unbuffered mcdiurn. In mediunl buffcrcd at 17EI 8.1 there is a slight stimulation of one or both species. The role of 1711 in the relation between the species seems therefore to bc very important.

Depression of Carbohydrate in Marine Algae by Urea Herbicides

Abstract: Representative species of six genera of marine unicellular algae (Chlorococcum sp., Dicrateria inornata Parke, Dunaliella tertiolecta Butcher, Nannochloris sp., Isochrysis galbana Parke, and Monochrysis lutheri Droop) were treated in unialgal culture with 3-(3,4-dichlorophenyl)-1,1-dimethylurea (diuron), 1-butyl-3-(3,4-dichlorophenyl)-1-methylurea (neburon), 3-(p-chlorophenyl)-1,1-dimethylurea (monuron), and 1,1-dimethyl-3-phenylurea (fenuron). Tests were conducted at salinities of 5, 10, 20, and 30 parts per thousand (ppt). The herbicides depressed concentration of carbohydrate in all species. Dunaliella tertiolecta was most resistant; its carbohydrate content decreased 9.2% at 5 ppt salinity and 17.9% at 30 ppt. Chlorococcum was most susceptible; its carbohydrate content decreased 49.1% at 5 ppt and 65.6% at 30 ppt salinity.