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Topics related to "protist"

desmid
desmid a protist of the class Charophyceae (see Chlorophyta ). ... Read more
Protista
Protista or Protoctista , in the five-kingdom system of classification, a kingdom comprising a variety of unicellular and some simple multinuclear and multicellular eukaryotic organisms. Protists, which are eukaryotes , have cells that have a membrane-bound nucleus, DNA that is associated with ... Read more
mildew
mildew name for certain fungi and protists, for the diseases they cause in various crops, and for the discoloration (and sometimes the weakening and disintegration) they cause in such materials as leather, fabrics, and paper. The powdery mildews usually grow on the surface of plant tissues, forming... Read more
blight
blight general term for any sudden and severe plant disease or for the agent that causes it. The term is now applied chiefly to diseases caused by bacteria (e.g., bean blights and fire blight of fruit trees), viruses (e.g., soybean bud blight), fungi (e.g., chestnut blight), and protists (e.g., pot... Read more
Monera
Monera taxonomic kingdom that comprises the prokaryotes ( bacteria and cyanobacteria ). Prokaryotes are single-celled organisms that lack a membrane-bound nucleus and usually lack membrane-bound organelles (mitochondria, chloroplasts; see cell , in biology). They have a small ring of DNA as thei... Read more
silica
silica or silicon dioxide, chemical compound, SiO 2 . It is insoluble in water, slightly soluble in alkalies, and soluble in dilute hydrofluoric acid. Pure silica is colorless to white. It occurs in several forms and is widely and abundantly distributed throughout the earth, both in the pure st... Read more
protozoan
protozoan , informal term for the unicellular heterotrophs of the kingdom Protista . Protozoans comprise a large, diverse assortment of microscopic or near-microscopic organisms that live as single cells or in simple colonies and that show no differentiation into tissues. Formerly classified in the... Read more
parasite
parasite plant or animal that at some stage of its existence obtains its nourishment from another living organism called the host. Parasites may or may not harm the host, but they never benefit it. They include members of many plant and animal groups, and nearly all living things are at some time h... Read more
ameba
ameba or amoeba , common name for certain one-celled organisms belonging to the phylum Sarcodina of the kingdom Protista . Amebas were previously classified as members of the animal kingdom. Most amebas are very small (from 5 to 20 microns in diameter) and contain a single nucleus. A. proteu... Read more
Fungi
Fungi , kingdom of heterotrophic single-celled, multinucleated, or multicellular organisms, including yeasts, molds, and mushrooms. The organisms live as parasites , symbionts, or saprobes (see saprophyte ). Previously classified in the plant kingdom, fungi are nonmotile, like plants, but lack the... Read more

Encyclopedia entries related to "protist"

Protista
Encyclopedia entry from: The Gale Encyclopedia of Science ...long. The word protist comes from the...indicates that protists were the first...makes an organism a protist. Protists are difficult to...parasitic, where the protist uses its host as...organism. Many protists are economically...
foraminifera and other unicellular microfossils
Book article from: The Oxford Companion to the Earth ...micron to several centimetres. Most protists occur as single cells but some occur...important group of planktonic marine protists which are capable of photosynthesis...Bacillariophyceae) are a group of photosynthesizing protists characterized by a siliceous cell wall...
major fossil groups: their origins
Book article from: The Oxford Companion to the Earth ...Animalia that ranges from some organisms almost as simple as protists to highly complex animals such as insects. The number of invertebrate...the larvae of modern cnidarians and developed from flagellate protists. From this form the cnidarians and poriferans developed...
protozoan
Book article from: The Columbia Encyclopedia, Sixth Edition ...classified in the animal kingdom, they are now generally divided into five protist phyla: Mastigophora (the flagellates), Sarcodina (the amebas...Illustrated Guide to the Protozoa (1985); M. Sleigh, Protozoa and Other Protists (1989).
Protozoa
Book article from: The Oxford Companion to the Earth ...phycologists tend to use mutually exclusive classifications. Protists arose from the prokaryotes (unicellular forms that lack a...between about 3000 and 2000 million years (Ma) ago). Most protist and protozoan groups are parasitic and non-mineralized...
Microorganisms
Encyclopedia entry from: The Gale Encyclopedia of Science ...They also have a number of other discrete cellular organelles. Protists are a major kingdom of eukaryotes that includes microscopic protozoans, some fungi, and some algae. Protists have flagellated spores, and mitochondria and plastids are often...
Cell
Encyclopedia entry from: UXL Encyclopedia of Science ...Cells, however, can also exist as single-celled organisms. The organisms called protists, for instance, are single-celled organisms. Examples of protists include the microscopic organism called Paramecium and the single-celled alga called...
Phytoplankton
Encyclopedia entry from: The Gale Encyclopedia of Science ...bacteria, but this group also includes certain kinds of protists (especially protozoans) that contain symbiotic algae or bacteria (algae or bacteria that co-exist with the protists, to the benefit of both). Phytoplankton are the key food...
mildew
Book article from: The Columbia Encyclopedia, Sixth Edition mildew name for certain fungi and protists, for the diseases they cause in various crops, and for the...considered fungi, the downy mildews are now more often considered protists. They attack grapes, cucumbers, potatoes, and other vegetables...
ostracods
Book article from: The Oxford Companion to the Earth ...freshwater environments. A few species have even adapted to life in humid terrestrial habitats. Their diet includes bacteria, protists of all kinds, living algae and higher plants, and the organic debris that results from the decomposition of plants and animals...

Dictionary entries related to "protist"

protist
Book article from: A Dictionary of Plant Sciences protist A single-celled...plant. Animal-like protists include naked and...ciliates; plant-like protists include dinoflagellates...classification, protists were grouped as a...multicellular organisms with protist affinities but previously...
Protista
Book article from: A Dictionary of Ecology ...zooflagellates, ciliates, dinoflagellates , diatoms , and algae are protists. In an earlier five-kingdom classification, Protista was ranked as a kingdom; later some multicellular organisms with protist affinities but previously classed as fungi or plants were transferred...
Animalia
Book article from: A Dictionary of Zoology ...first appeared in the Precambrian , the sponges (Porifera) from one kind of protist forebear, and all other animals from another (or possibly more than one other) protist. The oldest fossils are burrows of a coelomate in rocks rather less than...
net slime moulds
Book article from: A Dictionary of Plant Sciences net slime moulds The name sometimes applied to organisms that form a net plasmodium . Such organisms are variously regarded as fungi (class Labyrinthulomycetes), as protozoa, or as ‘protists’ unrelated to other organisms.
eukaryote
Book article from: A Dictionary of Plant Sciences eukaryote An organism whose cells have a distinct nucleus (i.e. all protists, fungi, plants, and animals). The first eukaryotes were almost certainly green algae ( Chlorophyceae ) and what appear to...
Gause, GeorgyiFrantsevich
Book article from: A Dictionary of Ecology ...and ecologist, best known for his competitive exclusion principle , which he derived from his studies of competition among protists and described in a monograph, The Struggle for Existence (1934). Gause studied biology at Moscow University. In 1942 he...
Keilin, David
Dictionary entry from: Complete Dictionary of Scientific Biography ...parasitic and free-living Diptera. In his entomological papers (he published about seventy up to 1931), he described eleven protists that were placed in new species or new genera. His interest in the adaptation of the dipterous larvae to the parasitic mode...
Radiolaria
Book article from: A Dictionary of Earth Sciences Radiolaria A large group of marine sarcodinids ( protists ), characterized by having a shell with a perforated, membraneous capsule containing the endoplasm, and a siliceous or strontium...
cryptophytes
Book article from: A Dictionary of Plant Sciences cryptophytes ( cryptomonads ) A small group of unicellular protists, sometimes regarded as algae (class Cryptophyceae) and sometimes as protozoa (class Phytomastigophora ). The cells are typically...
Protoctista
Book article from: A Dictionary of Earth Sciences Protoctista See PROTIST .

Related newspaper, magazine, and trade journal articles from HighBeam Research

DISCOVERY OF GIANT ROAMING DEEP SEA PROTIST PROVIDES NEW PERSPECTIVE ON ANIMAL EVOLUTION
News Wire article from: US Fed News Service, Including US State News; 11/20/2008; 700+ words ; ...the grape-sized protists and their complex...The giant deep sea protist, Gromia sphaerica...Now, we show that protists can leave traces...discovery of the giant protist. (Link goes to...confirmed that the giant protist found by Matz and...observe the giant protists in action, and...
New protist research from National Oceanic and Atmospheric Administration outlined.
Newspaper article from: Computer Weekly News; 8/11/2008; 692 words ; ...identified, scientists writing in the journal Protist report. Here, eight PKS transcripts...KS domains placed them well within the protist type I PKS clade. Thus although most...and colleagues published their study in Protist (The toxic dinoflagellate Karenia brevis...
Deep-sea protists may explain trace fossil evidence attributed to ancient animals.
Newspaper article from: NewsRx Health & Science; 12/14/2008; 700+ words ; ...the seafloor to this day. Protists are a diverse group of predominantly...traces produced by living giant protists, known as Gromia sphaerica...They stumbled upon the giant protists while working on a project...genes expressed in this giant protist and a few related protozoans...
TAS: New book catalogues Antarctic marine protists
Newspaper article from: AAP General News (Australia); 3/30/2005; 217 words ; ...book catalogues Antarctic marine protists Australia has reaffirmed its standing...identifies more than 560 Antarctic marine protists and is believed to be the world's most comprehensive protist guide. Protists are the microbial plants and animals...
Findings from University of Algarve broaden understanding of protist.
Newspaper article from: Nanotechnology Weekly; 8/11/2008; 700+ words ; ...Leite and colleagues published the results of their research in Protist (An oxygen molecular sensor, the HIF prolyl 4-hydroxylase, in the marine protist Perkinsus olseni. Protist, 2008;159(3):355-368). For additional information...
Protists in soil ecology and forest nutrient cycling.
Magazine article from: Canadian Journal of Forest Research; 7/1/2006; ; 700+ words ; ...functional groups of protists besides the bacterivores...contribution of other protist functional groups to...classification accepts "protists" as a common term for...10.sup.7] active protist individuals per gram...abundances of active protists may decrease to zero...
Protists
Magazine article from: Natural History; 6/1/1998; ; 370 words ; ...No question that sponges are true animals, not because sponges prowl around seizing prey but because the few cell types they have are animal-ike and also very similar to the most animal-like of the single-celled microbial protists.
Giant roaming deep-sea protist.(In The News: Short news items of interest to the scientific community)
Magazine article from: Science and Children; 1/1/2009; 700+ words ; ...exclusively the reign of protists," says Matz. "Our...confirmed that the giant protist found by Matz and his...not observe the giant protists in action, and Matz...Matz says the giant protists' bubblelike body design...11/20/giant_protist)
Phylogenetic position of amitochondriate protists in the evolution of eukaryotes.(Evolution: A Molecular Point of View)
Magazine article from: The Biological Bulletin; 6/1/1999; ; 700+ words ; ...phylogenetic relationship among protists, including amitochondrial...that three amitochondriate protists, Glugea plecoglossi (microsporidian...that another amitochondrial protist, Entamoeba histolytica, is...mitochondrion-containing protists, but is not likely to have...
Study of protists in the Alabama, Apalachicola, Choctawhatchee, Tennesee, and Tombigbee rivers.(Biological Sciences Poster Abstracts)(Report)
Magazine article from: Journal of the Alabama Academy of Science; 4/1/2009; 635 words ; STUDY OF PROTISTS IN THE ALABAMA, APALACHICOLA, CHOCTAWHATCHEE...Livingston, AL 35470. Microscopic protists occur in all types of habitats in our ecosystem. There are an immense number of protists which inhabit the freshwater rivers of...