الفهرس 
acknowledgmentOnly 14 pages are availabe for public view
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Abstract
The distribution and variation, in abundance of the microscopic algae are as yet
difficultto account for except in vague and general terms. These microscopic algae are
the primary producers of the organic matter on which all other forms of aquatic life
depend.They in turn limit the efficiency with which both fresh water and the sea can be
exploitedas sources of food, for human being and animals, as chemical derivatives or
harmful as toxins. Undoubtedly, more extensive and detailed observations of microscopic
algaepopulations and environmental factors in natural waters will contribute greatly to
understandingof what is taking place, by studies in the laboratory with cultures of
microscopicalgae under precisely controlled conditions also have an indispensable part
to play.Full understanding of the growth of these microscopic algae will be achieved
onlyby the synthesis of the results of physiological and biochemical investigations and
theresultsof the field studies.
It is the purpose of this work to study the principle features of the growth of the
microscopichalotolerant green alga Dunaliella salina in cultures as well as to elucidate
otherproblemsin biochemistry and cell physiology.
There are several ill-defined species of Dunaliella. All these species are
unicellulargreen algae (Chlorophyceae) belonging to order Volvocales. The cells are
ovoidin shape (8-25 urn length and 5-15 width) and equipped by two equal anterior
fagella (Butcher, 1959). Such alga contains a large cup-shaped chloroplast with a single
pyrenoidsurrounded by polysaccharide granules embedded in the basal portion.