Action spectra for delayed light production by several algae were determined from 250 to 750 mmicro incident light. In the visible portion of the spectrum the action spectra resemble those reported by previous workers for photosynthesis and light emission. Blue-green algae had a maximum at 620 mmicro, red algae at 550 mmicro, whereas green and brown algae have action spectra corresponding to ch...

The utilization of acetate by blue-green algae was examined and the activities of enzymes involved in its metabolism measured. Although acetate did not stimulate the endogenous respiration of these organisms, the oxidation of acetate was followed by the rate of release of [14C] carbon dioxide from [I-~~CC] and [2-l4CC] sodium acetate. Similarly, sodium acetate did not alter the rate of growth o...

Thermotropic properties of blue-green algae grown at high, room, and low temperatures in H(2)O and D(2)O media were studied by highly sensitive differential scanning microcalorimetry. The thermograms of these organisms contain an endothermal peak in the temperature range of 50 to 70 C with an endothermal heat ranging from 0.14 to 1.91 joules per gram organism. The temperature at which the endot...

HE blue-green algae are complex procaryotic organisms, genetic studies of Twhich might yield insight into the relationship between procaryotes and eucaryotes. Due to difficulties commonly encountered in growing blue-green algae on agar plates (ALLEN 1952; KUMAR 1962) and the apparent lack of an operational sexual system, genetic data on these organisms could not be established. However, this re...

Species of Lissothrips and Williamsiella live in association with mosses and lichens. Their gut contents are commonly blue-green, suggesting that they possibly feed on blue-green algae. Three species of Lissothrips are known from New Zealand, of which two are here recorded from Australia together with six new species. Williamsiella is recorded from Australia for the first time, with one new spe...

Cell-free filtrates of axenic or bacterized cultures of the dominant blue-green algae from a freshwater lake inhibited the growth of diatoms isolated from the same lake. Lake waters, collected during blue-green algal blooms, also inhibited diatom growth. In situ observations over a 5-year period indicate that diatom bloom populations vary inversely with the levels of the preceding blue-green al...

Sutmmary. Chlamydomonas and Chlorella were grown for 10 davs in white light. 955 Uw/cm2 blue light (400-500 m,u) or 685 Juw/cm2 red light (above 600 mb). Rates of growth in blue or red light were initially slow, but increased over a period of days until normal growth rates were reestablished. During this adaptation period in blue light, total chlorophyll per volume of algae increased 20 % while...