The aim of this research was to observe the effect of body size in micro algae as significant factor responsible to bioaccumulation of Pb. The research was conducted in Balai Budidaya Laut Hanura, South Lampung using micro algae Chlorella and Dunaliella, observing various Pb concentrations in culture medium and dry weight of micro algae to describe their tolerance and sensitivity levels. Pb con...

An aposymbiotic strain of Hydra viridis became infected with free-living Chlorella sp. A stable symbiosis formed that differed in its characteristics from other known Chlorella/Hydra symbioses. The algae reproduced and formed clusters in host endodermal cells, inside large vacuoles filled with an electron-dense substance. A few algae were found to be digested by the hydra, but the apparently un...

The Problem ..............................................................................................................................................................1 Pathophysiology ........................................................................................................................................................3 Mercury Toxicity Symptoms ................................

The technique of spray-freeze etching was applied to unicellular organisms. The superior freezing rates obtainable with this method gave excellent cryofixation on Chlorella, Euglena, and spermatozoa without the use of antifreeze agents, and cell damage due to ice crystal formation was never observed. In many instances the resultant morphology differed significantly from that obtained from glyce...

Glutam ine synthetase was partly purified from Chlorella pyrenoidosa. This enzyme activity was stimulated by dithioerythritol and 2'-3'-dimercaptopropanol (BAL). Full activation was obtained by thioredoxins isolated from the cyanobacterium Synechococcus 6301, from spinach and by heated Chlorella extract. The apparent Km for the purified thioredoxin B from Synechococcus 6301 was determined to be...

A 41,000 M(r) polypeptide of Chlorella exhibits a circadian rhythm in its synthesis and possesses characteristic features of a putative essential clock protein as was proposed by the coupled translation-membrane model. Purification of this polypeptide and a microsequencing analysis yielded a N-terminal sequence of 35 amino acids that showed no homology to known sequences that were thought to be...

The effects of sodium bicarbonate concentration, population density, and temperature on the maintenance of an outdoor monoculture of the cyanobacterium Spirulina platensis were studied. A clear response by Spirulina to the concentration of bicarbonate was evident, with 0.2M bicarbonate representing the lowest concentration in which a monoculture could be maintained. When the temperatures fell d...

A study was conducted to investigate the impact of NaCl on the physiological and biochemical traits of Chlorella vulgaris Beijerinck. In order to determine the impact of NaCl, Chlorella was exposed to different concentrations of NaCl ranging from 0.1-0.4M besides control over a period of 30 days. It was found that total chlorophyll contents stimulated at lower concentrations of NaCl (0.1 and 0....

Cadmium (Cd) is a metal that can negatively interfere with the metabolic systems of living beings. The objective of this work was to evaluate the capacity for cadmium removal in aqueous solutions by immobilized Chlorella sp. in calcium alginate beads. Beads without Chlorella sp. were used as a control. All the treatments were established in triplicate for 80 min, at four concentrations of cadmi...

Biotechnology of microalgae represents a very attractive alternative as a source of energy and substances of high value when compared with plant cultivation. Cell walls of green microalgae have an extraordinary chemical and mechanical resistance and may impede some steps in the biotechnological/industrial exploitation of algae. The aim of the present contribution was to check the presence of po...