Showing papers on "Chlorococcum published in 1967"

Passive Dispersal of Viable Algae and Protozoa By Certain Craneflies and Midges

Abstract: Four species of aquatic Diptera, Tipula triplex Walker (Tipulidae), Bittacomorpha clavipes (F.) (Ptychopteridae), Chaoborus punctipennis (Say) (Culicidae), and Tendipes sp. (Tendipedidae), were collected aseptically and used to inoculate sterile soil—water extract. Twenty—one genera of algae, five Protozoa, a moss protonema and Alternaria were identified in the 51 cultured washings. Comparisons by "Student's t" showed that B. clavipes carried significantly more algae and Protozoa than the other three insect species, and T. triplex carried more than the midges. Found in over 18% of the cultures were the blue—green algae Anabaena, Anacystis, Chroococcus and Phormidium, and the green algae Chlamydomonas, Chlorella, Chlorococcum and Protococcus. The protozoans were found at lower frequencies. It is suggested that these viable algae and Protozoa are carried by these four insect species across land barriers. See full-text article at JSTOR

PHOTOSYNTHESIS IN ALGAE: III DISTRIBUTION OF SOLUBLE CARBOHYDRATES AND DIMETHYL-β-PROPIOTHETIN IN MARINE UNICELLULAR CHLOROPHYCEAE AND PRASINOPHYCEAE

Abstract: The 80% alcohol-soluble carbohydrates accumulated by 23 species of green marine phytoplankton were examined after of photosynthesis in NaH14CO3. The presence of dimethyl-β-propiothetin (DMPT) and H2S was also noted.The major radioactive products in the Chlorophyceae were sucrose (five isolates), glycerol (three isolates), and mannitol (two isolates). Mannitol and sucrose were never found in the same extract, although glycerol and sucrose were found together in two organisms. DMPT occurred in Chlorococcum sp., and H2S appeared only in one Chlamydomonas sp.All 13 organisms assigned to the Prasinophyceae produced 14C-mannitol, and all except Pyramimonas sp. contained DMPT. H2S was observed in one strain of Tetraselmis sp. Sucrose and glycerol were not found in this class.

Development of Red Pigmentation in Chlorococcum

Abstract: The concentration of the red pigmentation in Chlorococcum wimmeri is primarily a function of light intensity, although it is enhanced by near red illumination and also influenced by carbon dioxide concentration. It is independent of cell age and of nitrate content, oxygen, and pH of the growth medium. The red pigmentation is composed of astacin, esterified astaxanthin, an unknown ester, and an allied carotenoid. Chlorococcum wimmeri possesses, on a chlorophyll basis, higher rates of photo­ synthesis and the quinone Hill reaction than Chlorella pyrenoidosa under the same conditions.