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Stokesia (ciliate)
''Stokesia'' is a genus of single-celled ciliates in the family Stokesiidae ''Stokesiidae'' is a family of ciliates in the order Peniculida. References Stokesiidae on www.taxonomy.nl Ciliate families {{Ciliate-stub .... The only species in this genus is ''Stokesia vernalis''. References Stokesiidae on www.taxonomy.nl Stokesiidae Ciliate genera {{ciliate-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eukaryote
Eukaryotes () are organisms whose cells have a nucleus. All animals, plants, fungi, and many unicellular organisms, are Eukaryotes. They belong to the group of organisms Eukaryota or Eukarya, which is one of the three domains of life. Bacteria and Archaea (both prokaryotes) make up the other two domains. The eukaryotes are usually now regarded as having emerged in the Archaea or as a sister of the Asgard archaea. This implies that there are only two domains of life, Bacteria and Archaea, with eukaryotes incorporated among archaea. Eukaryotes represent a small minority of the number of organisms, but, due to their generally much larger size, their collective global biomass is estimated to be about equal to that of prokaryotes. Eukaryotes emerged approximately 2.3–1.8 billion years ago, during the Proterozoic eon, likely as flagellated phagotrophs. Their name comes from the Greek εὖ (''eu'', "well" or "good") and κάρυον (''karyon'', "nut" or "kernel"). E ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
SAR Supergroup
The SAR supergroup, also just SAR or Harosa, is a clade that includes stramenopiles (heterokonts), alveolates, and Rhizaria. The name is an acronym derived from the first letters of each of these clades; it has been alternatively spelled "RAS". The term "Harosa" (at the subkingdom level) has also been used. The SAR supergroup is a node-based taxon. Note that as a formal taxon, "Sar" has only its first letter capitalized, while the earlier abbreviation, SAR, retains all uppercase letters. Both names refer to the same group of organisms, unless further taxonomic revisions deem otherwise. Members of the SAR supergroup were once included under the separate supergroups Chromalveolata ( Chromista and Alveolata) and Rhizaria, until phylogenetic studies confirmed that stramenopiles and alveolates diverged with Rhizaria. This apparently excluded haptophytes and cryptomonads, leading Okamoto ''et al.'' (2009) to propose the clade Hacrobia to accommodate them. Phylogeny Based on a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ciliate
The ciliates are a group of alveolates characterized by the presence of hair-like organelles called cilia, which are identical in structure to eukaryotic flagella, but are in general shorter and present in much larger numbers, with a different undulating pattern than flagella. Cilia occur in all members of the group (although the peculiar Suctoria only have them for part of their life cycle) and are variously used in swimming, crawling, attachment, feeding, and sensation. Ciliates are an important group of protists, common almost anywhere there is water—in lakes, ponds, oceans, rivers, and soils. About 4,500 unique free-living species have been described, and the potential number of extant species is estimated at 27,000–40,000. Included in this number are many ectosymbiotic and endosymbiotic species, as well as some obligate and opportunistic parasites. Ciliate species range in size from as little as 10 µm in some colpodeans to as much as 4 mm in length in s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oligohymenophorea
The Oligohymenophorea are a large class of ciliates. There is typically a ventral groove containing the mouth and distinct oral cilia, separate from those of the body. These include a paroral membrane to the right of the mouth and membranelles, usually three in number, to its left. The cytopharynx is inconspicuous and never forms the complex cyrtos found in similar classes. Body cilia generally arise from monokinetids, with dikinetids occurring in limited distribution over part of the body. In most groups the body cilia are uniform and often dense, while the oral cilia are inconspicuous and sometimes reduced, but among the peritrichs almost the opposite is the case. Members are widely distributed, and include many free-living (typically fresh-water, but many marine) and symbiotic forms. Most are microphagous, grazing on smaller organisms swept into the mouth by the cilia, but various other feeding habits occur. In one group, the astomes, the mouth and associated struct ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Roque
Roque is an American variant of croquet played on a hard, smooth surface. Popular in the first quarter of the 20th century and billed "the Game of the Century" by its enthusiasts, it was an Olympic sport in the 1904 Summer Games, replacing croquet from the previous games. Roque court and equipment Roque is played on a hard sand or clay 30 by 60 foot The foot ( : feet) is an anatomical structure found in many vertebrates. It is the terminal portion of a limb which bears weight and allows locomotion. In many animals with feet, the foot is a separate organ at the terminal part of the leg made ... (approximately 9 by 19 m) court bordered by a boundary wall, a curb bevelled at the ends to form an octagon. Players use this wall to balls similarly to how billiard balls are played off the cushions of a billiard table. The wickets, called arches, are permanently anchored in the court. The arches are narrow as in professional six-wicket croquet. The court has ten arche ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1961 In Science
The year 1961 in science and technology involved some significant events, listed below. Astronomy and space exploration * January 31 – Ham, a 37-pound male chimpanzee, is rocketed into space in a test of the Project Mercury capsule designed to carry U.S. astronauts into space. As a result, the chimpanzee became the first Hominidae in space. * April 12 – Yuri Gagarin is the first human in space, making a single Low Earth orbit in Vostok 1 before parachuting to the ground. * April 15 – R. N. Schwartz and Charles Hard Townes publish "Interstellar and Interplanetary Communication by Optical Masers" in ''Nature'', providing a basis for Optical SETI. * May 5 - Alan Shepard, a NASA astronaut, is the first American in space as part of the suborbital Freedom 7 mission which featured the first manual control of a spacecraft and the first landing with the crew on board, the latter making it the first crewed "completed spaceflight" based on past definitions of the Fédération Aéron ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
