By Sherman Hollar

Describes the actual features of bactera, algae and protozoa, and a number of the clinical and commercial makes use of of bacteria.

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Additional resources for A closer look at bacteria, algae, and protozoa

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Coli Escherichia coli bacteria normally inhabit the stomach and intestines. When E. coli is consumed in contaminated water, milk, or food or is transmitted through the bite of a fly or other insect, it can cause gastrointestinal illness. Mutations can lead to strains that cause 30 the ImPortAnce, dAngers, And uses of BActerIA diarrhea by giving off toxins, invading the intestinal lining, or sticking to the intestinal wall. Therapy for gastrointestinal illness consists largely of fluid replacement, though specific drugs are effective in some cases.

In the natural world, algae are the chief food source for many fish and other aquatic organisms, and they contribute substantially to the store of oxygen on Earth. Characteristics of Algae The word algae comes from the Latin word for seaweeds. Algae is the plural form of the word alga, which denotes a single algal organism. Algae species range in size and composition from the tiny single-celled Micromonas to the giant multicellular sea kelps that aggregate into the underwater kelp forests found along continental coastlines.

The phaeophytes are an important source of algin, a substance used in food processing and other industries. Certain species of brown algae are also used as fertilizer, and several, such as species of Laminaria, are eaten as a vegetable in Asia. 56 feAtures And tyPes of AlgAe The Sargasso Sea A free-floating meadow of seaweed almost as large as a continent lies between the United States and Africa in the North Atlantic Ocean. This is the famous Sargasso Sea. Christopher Columbus discovered it as he sailed toward the New World in 1492.

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A closer look at bacteria, algae, and protozoa by Sherman Hollar
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