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

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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Extra info for A closer look at bacteria, algae, and protozoa

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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. Its presence suggested that land was near and encouraged him to continue. The tangled seaweed of the Sargasso Sea is brown marine algae belonging to the genus Sargassum, popularly called gulfweed. Most of the weeds are S.

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. The illness is usually self-limiting, with no evidence of long-lasting effects. However, one dangerous strain causes bloody diarrhea, kidney failure, and death in extreme cases. Proper cooking of meat and washing of produce can prevent infection from contaminated food sources.

Some dinoflagellates use photosynthesis to create their own food—and are therefore autotrophic—and others are heterotrophs. Some species may exist as phytoplankton (free-floating autotrophs), while others may live inside other organisms, such as sponges or jellyfish, in a symbiotic relationship. Like the diatoms, photosynthetic dinoflagellates are extremely important sources of nutrients for larger organisms in aquatic environments. Under certain conditions, such as warm water temperatures and increased nutrients, dinoflagellate populations can explode, or bloom.

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