By Orvil Roger Anderson
The protozoa are an eclectic assemblage of organisms encompassing quite a lot of single-celled and multiple-celled colonial organisms missing tissue organiza tion, yet displaying remarkably sophisticated organic habit. In a few sleek classifications, they're labeled as a subkingdom one of the Protista (eukary otic single-celled organisms). even supposing they don't seem to be thought of a proper cate gory by way of a few taxonomists and a few biologists examine the identify irrelevant (inferring that they're the 1st unicellular animals, even supposing a few photosynthe size), it truly is nonetheless handy to contemplate this crew of organisms as an off-the-cuff assortment below the heading of protozoa. Their cosmopolitan distribution, sig nificant ecological position in mineral recycling and enhancement of carbon circulation via decrease trophic degrees of nutrition webs, and memorable mobile variations to augment survival in assorted environments cause them to major organisms for organic research. occasionally, biologists are brought to this staff in first point classes or in invertebrate zoology, yet by no means improve a whole appreciation for the varied and biologically subtle features of those organisms. This e-book is meant as a survey of huge suggestions in protozoan biology with an emphasis on comparative info. the point of interest is at the zoological facets of the gang. subject matters extra heavily with regards to plantlike features, as provided in books on phycol ogy, aren't thought of intimately the following. a legitimate history in sleek biology and an creation to mobile biology should be useful in knowing Chapters 15 and sixteen, which come with quite a lot of details on biochemistry.
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Extra info for Comparative Protozoology: Ecology, Physiology, Life History
Within the cell, the nitrogen can be assimilated only in a reduced form. Nitrate is reduced by a succession of steps probably corresponding to the following sequence: -3 +1 NH4 . A more detailed treatment of the biochemistry of this process is presented by Morris (1974). There appear to be only two enzymes involved in the entire sequence: nitrate reductase, which cata1yzes the reduction of nitrate to nitrite, and nitrite reductase, which catalyzes the reduction of nitrite to ammonium. The ammonium can be utilized in production of amino acids, nucleic acids, and other nitrogen-containing organic molecules.
2. This includes one flagellate, Chilomonas paramecium, that incidentally is also not inhibited by light (Cook 1968). Cryophilic or cryotolerant species dwell at low temperatures in snow and ice packs, for example, where temperatures typically approach or fall below the freezing point of water. Snow flagellates (including chlamydomonads, euglenoids, chrysophytes, dinoflagellates, and cryptomonads) usually develop blooms when the temperature increases above freezing and melt water forms. Some of these species are limited to growth in a narrow temperature range 1 to 10°C and form resting or environmentally resistant stages (eg, palmella or cysts) when the temperature is below or above their optimal range (Hoham 1980).
They depend on ingested organisms not only for growth promoting substances (auxotrophy), but also as a source of requisite major organic compounds such as amino acids that they may be unable to synthesize from simpler compounds. These organic substances are often required in the proper proportions characteristic of their particular prey. This may explain their obligate nutritional dependence on one prey species. Some of these live in relatively clean environments and prey on other protozoa or algae.
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