Earlier this month, Toledo, Ohio, watched its municipal water supply descend into an undrinkable stew of algal toxins.
The algal host cells lie in the medulla, just below the upper cortex.
The algal hosts are usually Dactylococcus or Polycoccus, and both hosts are sometimes found in the same thallus.
The chains of cells are usually badly broken up, and the nature of the algal host is, therefore, difficult to distinguish.
The work was begun with an inquiry into the extent of the trouble from algal pollution.
It was, therefore, most desirable to devise a method of ridding the bed of algal growth without injuring the cress.
This only killed the algal growth with which the particles of copper came in contact and left the main body of alg unaffected.
The protoplasmic contents of this siliceous box-like unicell are very similar to the contents of many other algal cells.
(plural), 1794, from alga (singular), 1550s, from Latin alga "seaweed," of uncertain origin, perhaps from a PIE root meaning "to putrefy, rot."
algae al·gae (āl'jē)
Any of various chiefly aquatic, eukaryotic, photosynthetic organisms, ranging in size from single-celled forms to the giant kelp.
Primitive organisms that contain chlorophyll but do not have structures, such as xylem and phloem, to transport fluids. Algae sometimes contain only a single cell, and nowadays they are not considered members of the plant kingdom.
Note: The most familiar algae are the greenish scum that collects in still water.
Note: Algae supply a considerable part of the world's oxygen.