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Topic: Genus

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The genus of a surface is a topological invariant that is (roughly) the number of holes in the surface, usually denoted as g.
For example, the genus of a coffee cup or a torus is 1, whilst the genus of a sphere is 0.
Subaltern genus Logic, a genus which may be a species of a higher genus, as the genus denoted by quadruped, which is also a species of mammal.
www.everything2.com /index.pl?node=genus   (384 words)

  PlanetMath: genus of topological surface
The genus is a topological invariant of surfaces.
It is one of the oldest known topological invariants and, in fact, much of topology has been created in order to generalize this notion to more general situations than the topology of surfaces.
This is version 26 of genus of topological surface, born on 2002-08-15, modified 2006-09-11.
planetmath.org /encyclopedia/Genus2.html   (241 words)

  Genus (mathematics) - Wikipedia, the free encyclopedia
The (non-orientable) genus of a connected, non-orientable closed surface is a positive integer representing the number of cross-caps attached to a sphere.
The genus of a knot K is defined as the minimal genus of all Seifert surfaces for K.
The genus of a group G is the minimum genus of any of (connected, undirected) Cayley graphs for G.
en.wikipedia.org /wiki/Genus_(mathematics)   (408 words)

 Genus - Wikipedia, the free encyclopedia
In biology, a genus (plural genera) is a taxonomic grouping.
A genus has one or more species: if it has more than one species these are likely to be morphologically more similar than species belonging to different genera.
A genus in one kingdom is allowed to bear a name that is in use as a genus name or other taxon name in another kingdom.
en.wikipedia.org /wiki/Genus   (316 words)

 genus - Search Results - MSN Encarta
Genus, in biology, category of classification of living things; specifically, a group of species (Species and Speciation) closely related in...
Cereus, genus of plants of the cactus family, including a large but undetermined number of species.
The genus is found in the southern United...
encarta.msn.com /genus.html   (143 words)

 PlanetMath: genus
(alternatively, genus is additive with respect to connected sum, and the genus of a torus is 1).
Recall that a smooth complex curve is also a Riemann surface, and hence topologically a surface.
This is version 6 of genus, born on 2001-12-21, modified 2002-12-04.
planetmath.org /encyclopedia/Genus.html   (273 words)

 Genus Opuntia (incl. Cylindropuntia, Grusonia, and Corynopuntia)
The genus Opuntia is quite large, yet it is still replete with hidden diversity.
The genus ranges from southern Canada to southern South America, in habitats ranging from arid desert to tropical semiarid woodlands and high mountains.
Recent genetic studies reveal that the different subgenera of this genus may be distinct enough to warrant their elevation to full genera.
www.desertmuseum.org /books/opuntia.html   (3778 words)

 Genus Summary
A genus (plural, genera) is a category in biological classification, referring to groups of species that are closely related phylogenetically (that is, through their evolutionary history) and share many elements of their morphology, biochemistry, and behavior.
A genus has one or more species: if it has more than one species these are likely to be morphologically more similar than species belonging to different genera.
A genus in one kingdom is allowed to bear a name that is in use as a genus name or other taxon name in another kingdom.
www.bookrags.com /Genus   (523 words)

 Medieval Sourcebook: Aquinas: Ente et Essentia
For the genus signifies the whole as a certain denomination determining that which is material in the thing without a determination of its proper form, whence the genus is taken from the matter, although it is not the matter.
For, the genus is not the matter, though it is taken from the matter as signifying the whole; nor is the difference the form, though it is taken from the form as signifying the whole.
We should note, though, that the genus and difference in immaterial substances are not taken in the same way as in sensible substances, for in sensible substances the genus is taken from that which is material in the thing, while the difference is taken from that which is formal in the thing.
www.fordham.edu /halsall/basis/aquinas-esse.html   (7641 words)

 Genus   (Site not responding. Last check: 2007-11-07)
Genus : Part of the system of biological classification: a group of closely-related species.
The word is singular (a genus), and its plural is genera (two genera).
The genus name (generic name) usually is placed in italics or is underlined, and it has a capital initial letter.
molecrickets.ifas.ufl.edu /mcri005a.htm   (63 words)

 Online Dictionary for French English, Spanish English, Italian English, and more.
Genus of herbs found chiefly in north temperate regions having pinnate leaves and yellow flowers followed by bristly fruit.
Genus of showy South American herbs with leafy stems; sometimes placed in family Alstroemeriaceae or in family Amaryllidaceae.
A genus of fossil birds; SYN: genus Archeopteryx.
www.ultralingua.net /?service=ee&text=genus   (565 words)

 Genus Cephalorhynchus
The fl dolphin is the least known of the genus Cephalorhynchus, with almost nothing known about the biology or natural history, no records of specimens held in captivity, and almost no formal studies of the species.
It appears to be mostly typical of the genus, consuming similar prey, making similar vocalizations, and having the same inherent wariness, which helps to result in its obscurity.
Unlike many other members of the genus, which have distinctly rounded dorsal fins, the dorsal fin of this species is triangular.
library.thinkquest.org /17963/genus-Cephalorhynchus.html   (1539 words)

 Genus Plc
Nothing in on Genusplc.com or other Genus web sites is intended, nor may it be construed to constitute claims or warranties relating to possible results or outcomes from the information discussed in the forward-looking statement.
Genus does not (a) make any warranty, express or implied, with respect to the use of the links provided; or (b) guarantee the accuracy, completeness, usefulness or adequacy of any resources, information, apparatus, product, or process available at or from any of the linked services.
Genus is not responsible for any errors or omissions in the resources or information available at or from such links.
www.sygeninternational.com /terms.html   (866 words)

 [No title]
The taxonomic structure of members of the genus Azoarcus sensu lato was reassessed in a polyphasic approach.
The genus Veillonella consists of small, non-fermentative, strictly anaerobic, Gram-negative cocci that form part of the oral, genitourinary, respiratory and intestinal flora of man and animals.
The genus Deleya was created to encompass a number of marine organisms that had previously been classified in diverse genera.
www.lycos.com /info/genus.html   (709 words)

 Genus   (Site not responding. Last check: 2007-11-07)
GENUS: Part of the system of biological classification: a group of closely-related species.
The sweetpotato and silverleaf whiteflies both belong to the genus Bemisia, while the greenhouse whitefly is in the genus Trialeurodes.
The genus name usually is placed in italics or is underlined, and it has a capital initial letter.
whiteflies.ifas.ufl.edu /wfly0055.htm   (64 words)

genus name (always capitalized) and a species modifier (known as the "epithet").
Should this specimen turn out to be assignable to another genus, the genus name linked to it becomes a junior synonym, and the remaining taxa in the now-invalid genus need to be reassessed.
Rules-of-thumb for delimiting a genus are outlined e.g.
www.buzznet.com /tags/genus   (314 words)

 Virus Nomenclature   (Site not responding. Last check: 2007-11-07)
In formal taxonomic usage, the first letters of virus family, subfamily, and genus names are capitalized and the terms are printed in italics (underlined when typewritten).
In informal vernacular usage, virus family, subfamily, genus and species names are written in lower case Roman script; they are not capitalized, nor are they printed in italics or underlined.
The formal family, subfamily, and genus terms and standard ICTV vernacular species terms, rather than any synonyms or transliterations, should be used as the basis for choosing vernacular terms.
www.ncbi.nlm.nih.gov /ICTVdb/ICTVWeb/intro_to_universal/virus_nomenclature.html   (429 words)

 Genus, species and world order
Genus consists of very similar groups, but members of different groups usually cannot breed with one another.
Both the coyote and the timber wolf are in the genus Canis.
The coyote is Canis latrans, and the gray wolf is Canis lupus.
www.buginabox.com /genspecandwo.html   (1086 words)

 Genus   (Site not responding. Last check: 2007-11-07)
The genus is sort of like the surname, whereas the species is the first name.
As a formality the genus name, like the species name, has to be written in italics.
Note that the genus name is only one half of the scientific name.
www.kheper.net /evolution/systematics/Genus.htm   (330 words)

 [No title]
It is the first member of this genus that is reported to form pseudosporangia, which resemble those of members of the genus Kibdelosporangium.
Furthermore, this genus along with the genus Lingula, both of which have provided a name for the family, share an occurrence unique among the inarticulated brachiopods: that is many more or less complete fossils specimens have been assigned to one or the other genus based solely on the shape of the shell.
The Chinese BAV isolate (BAV-Ch), which causes encephalitis in humans, was shown to have a structural organization and particle morphology reminiscent of that of rotaviruses, with fibre proteins projecting from the surface of the particle.
www.lycos.com /info/genus--species.html?page=4   (666 words)

 LiveScience.com - New Genus of Cricket Found in Arizona Cave
In a rare type of discovery, researchers have identified a whole new genus of cricket in caves in Grand Canyon-Parashant National Monument in northwestern Arizona.
The new genus has yet to be named.
A genus is a major subdivision within a family of living things that typically includes more than one species.
www.livescience.com /animalworld/060505_cricket_genus.html   (449 words)

 USATODAY.com - Newly discovered monkey rates own genus   (Site not responding. Last check: 2007-11-07)
It is the first new genus for an African primate in 83 years.
Genus and species are scientific descriptive terms used to classify plants and animals.
The most general classification is kingdom, followed by phylum, class, order, family, genus, species and subspecies.
www.usatoday.com /tech/science/discoveries/2006-05-11-monkey-genus_x.htm?csp=34&ord=8   (361 words)

 The Role of Taxonomy   (Site not responding. Last check: 2007-11-07)
A genus may contain more than one species, and species are placed together in a genus based on perceived genetic affinity (as determined mostly by morphological differences and similarities, although biochemical techniques are providing new, additional information).
Monographs contain thorough treatments of all the species in a larger group, such as a genus or family, and monographs represent the latest summary of information for that group.
The genus name was changed from Salmo to Oncorhynchus partly based on fossil evidence because the Pacific trouts were thought to be more closely related to the Pacific salmon than to the Atlantic salmon [the name carrier or type of Salmo].
www.fishbase.org /manual/FishbaseThe_Role_of_Taxonomy.htm   (838 words)

UK bulls to boost Genus ABS Sexed Line Up...find out more here...
Genus, in conjunction with Blade Farming, have launched the UK's first fully integrated beef supply scheme...
Genus offer two unique services; Long Life Breeder and Reproductive Management Systems.
www.genusbreeding.co.uk   (115 words)

 Genus Dasypus
Members of this genus are characterized by the long, pointed nose and relatively short legs.
The ears may be 40 to 50% of the length of the head, and the tail is around 70% of the length of the body.
Members of the genus Dasypus are generally considered to be ecologically important due to their destruction of unwanted insects.
www.msu.edu /~nixonjos/armadillo/dasypus.html   (2985 words)

 The genus Ensete
The genus Ensete was first described by Paul (Paulo or Paulus) Fedorowitsch Horaninow (or Horaninov) (1796 - 1865) in his Prodromus Monographiae Scitaminarum of 1862 in which he created a single species, Ensete edule.
However, the genus did not receive general recognition until 1947 when it was revived by E. Cheesman in the first of a series of papers in the Kew Bulletin on the classification of the bananas.
The composition of the genus Ensete is not settled definitively.
www.users.globalnet.co.uk /~drc/genusensete.htm   (1374 words)

 Genus MD on Oak Hill Hospital
Genus MD is the natural order of information, it is a personalized information system for HCA affiliated physicians who need more convenient access to information.
Unlike other systems that are only accessible at the hospital or office, and only interface with one hospital system, Genus MD is available over the Internet and combines both clinical and non-clinical information into a single point of access in order to improve care management capabilities for HCA affiliated physicians.
Genus MD is one such system - designed especially for physicians.
www.oakhillhospital.com /GenusHome.asp   (253 words)

 The Genus Iris   (Site not responding. Last check: 2007-11-07)
Rodionenko's 1961 reclassification in The Genus Iris (in Russian, Moscow, 1961) was more ambitious in that he split the genus into five genera: Iris (includes rhyzomatous irises), Xiphium (bulbous irises like Dutch and English irises), Iridodictyum (bulbous irises like reticulata), Gynandriris (just what Linnaeus called Iris sisyrinchium), and Juno (bulbous Juno irises).
In this classification, a genus may be divided into subgenera, a subgenus into sections, a section into subsections, and a subsection into series.
The rhyzomatous irises (genus Iris) could be divided into three major parts: beardless irises (subgenera Limniris and Xyridion), crested irises (subgenus Crossiris), and bearded irises (subgenus Iris).
aleph0.clarku.edu /~djoyce/iris/genus.html   (836 words)

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