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Patagioenas
''Patagioenas'' is a genus of New World pigeons whose distinctness from the genus ''Columba'' was long disputed but ultimately confirmed. It is basal to the ''Columba''-''Streptopelia'' radiation with their ancestors diverging from that lineage likely over 8 million years ago. While the biogeographic pattern of this group suggests that the ancestors of typical pigeons and turtle-doves settled the Old World from the Americas, ''Patagioenas'' may also be the offspring of Old World pigeons that radiated into different genera later, given that the cuckoo-doves (''Macropygia'') of Southeast Asia also seem to be closely related.Johnson ''et al.'' (2001), Cheke (2005) Taxonomy The genus ''Patagioenas'' was introduced by German naturalist Ludwig Reichenbach in 1853, with the white-crowned pigeon (''Patagioenas leucocephala'') as the type species. The genus name combines the Ancient Greek ''patageō'' meaning "to clatter" and ''oinas'' meaning "pigeon". There are 17 species of ''Pata ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Band-tailed Pigeon
The band-tailed pigeon (''Patagioenas fasciata'') is a pigeon native to the Americas, and the largest pigeon native to North America. They are a native species throughout the Southwestern United States and Mexico, extending south to Peru. Taxonomy Its closest living relatives are the Chilean pigeon and the ring-tailed pigeon, which form a clade of ''Patagioenas'' with a terminal tail band and iridescent plumage on their necks. There are at least 8 sub-species, and some authorities split this species into the northern band-tailed pigeon (''Patagioenas fasciata'') and the southern band-tailed pigeon (''Patagioenas albilinea''). Use as genetic proxy The band-tailed pigeon is the closest living relative of the extinct passenger pigeon and has been investigated for use in efforts to bring back that species. Distribution and habitat It ranges from British Columbia, Washington, Oregon, California, and southern Arizona south in higher elevations through Mexico and Central Amer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
White-crowned Pigeon
The white-crowned pigeon (''Patagioenas leucocephala'') is a fruit and seed-eating species of bird in the dove and pigeon family Columbidae. It is found primarily in the Caribbean. John James Audubon painted these pigeons, including the watercolour painting in his work, ''Birds of America (book), Birds of America'', published in the early 19th century. Taxonomy In the first half of the 18th century the white-crowned pigeon was described and illustrated by several naturalists including John Ray in 1713, Hans Sloane in 1725 and Mark Catesby in 1731. When in 1758 the Swedish naturalist Carl Linnaeus updated his ''Systema Naturae'' for the 10th edition of Systema Naturae, tenth edition, he placed the white-crowned pigeon with all the other pigeons in the genus ''Columba (genus), Columba''. Linnaeus included a brief description, coined the binomial name ''Columba leucocephala'' and cited the earlier authors. The specific epithet combines the Ancient Greek ''leukos'' meaning "white" a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Columba (genus)
The bird genus ''Columba'' comprises a genus of medium to large pigeons. The terms "dove" and "pigeon" are used indiscriminately for smaller and larger Columbidae, respectively. ''Columba'' species are mostly termed "pigeons", and in many cases "wood pigeons", but some (including the type species of the genus), are termed "doves". The rock dove (''C. livia'') has given rise to the majority of domesticated pigeon breeds, such as the racing pigeon and the fantail pigeon, some of which have become feral. Meanwhile, "wood pigeon" by itself usually means the common wood pigeon (''C. palumbus''). This genus as understood today is native to the Old World, but some (notably the domestic and feral rock dove) have been introduced outside their natural range, for example in the Americas. Etymology The term ''columba'' comes from the Latin ''columba'', "a dove", the feminine form of ''columbus'', "a male dove", itself the latinisation of the Greek κόλυμβος (''kolumbos''), "dive ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dove
Columbidae is a bird family consisting of doves and pigeons. It is the only family in the order Columbiformes. These are stout-bodied birds with small heads, relatively short necks and slender bills that in some species feature fleshy ceres. They feed largely on plant matter, feeding on seeds ( granivory), fruit (frugivory), and foliage (folivory). In colloquial English, the smaller species tend to be called "doves", and the larger ones "pigeons", although the distinction is not consistent, and there is no scientific separation between them. Historically, the common names for these birds involve a great deal of variation. The bird most commonly referred to as "pigeon" is the domestic pigeon, descendant of the wild rock dove, which is a common inhabitant of cities as the feral pigeon. Columbidae contains 51 genera divided into 353 species. The family occurs worldwide, often in close proximity to humans, but the greatest diversity is in the Indomalayan and Australasian ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Streptopelia
''Streptopelia'' (collared doves and turtle doves) is a genus of 15 species of birds in the pigeon and dove family Columbidae native to the Old World in Africa, Europe, and Asia. These are mainly slim, small to medium-sized species. The upperparts tend to be buffy brown and the underparts are often a shade of pinkish-brown, and they have a characteristic black-and-white patch on the neck. They have cooing or purring songs, monotonous in some, restful and soothing in others. The genus divides into two groups, the collared dove group (11 species) with uniform upperparts and a black half-collar edged with white, and the turtle dove group (4 species) with patterned upperparts and a barred side panel on the neck. They range in size from the 20–23 cm red collared dove to the 33–35 cm oriental turtle dove. Most of the species are resident or disperse over short distances, but two (the European turtle dove, European and Oriental turtle doves) are long-distance bird migration, migrants ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Subgenera
In biology, a subgenus ( subgenera) is a taxonomic rank directly below genus. In the International Code of Zoological Nomenclature, a subgeneric name can be used independently or included in a species name, in parentheses, placed between the generic name and the specific epithet: e.g. the tiger cowry of the Indo-Pacific, ''Cypraea'' (''Cypraea'') ''tigris'' Linnaeus, which belongs to the subgenus ''Cypraea'' of the genus ''Cypraea''. However, it is not mandatory, or even customary, when giving the name of a species, to include the subgeneric name. In the International Code of Nomenclature for algae, fungi, and plants (ICNafp), the subgenus is one of the possible subdivisions of a genus. There is no limit to the number of divisions that are permitted within a genus by adding the prefix "sub-" or in other ways as long as no confusion can result. Article 4 The secondary ranks of section and series are subordinate to subgenus. An example is ''Banksia'' subg. ''Isostylis'', a sub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Morphology (biology)
Morphology (from Ancient Greek μορφή (morphḗ) "form", and λόγος (lógos) "word, study, research") is the study of the form and structure of organisms and their specific structural features. This includes aspects of the outward appearance (shape, structure, color, pattern, size), as well as the form and structure of internal parts like bones and organs, i.e., anatomy. This is in contrast to physiology, which deals primarily with function. Morphology is a branch of life science dealing with the study of the overall structure of an organism or taxon and its component parts. History The etymology of the word "morphology" is from the Ancient Greek (), meaning "form", and (), meaning "word, study, research". While the concept of form in biology, opposed to function, dates back to Aristotle (see Aristotle's biology), the field of morphology was developed by Johann Wolfgang von Goethe (1790) and independently by the German anatomist and physiologist Karl Fried ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Intron
An intron is any nucleotide sequence within a gene that is not expressed or operative in the final RNA product. The word ''intron'' is derived from the term ''intragenic region'', i.e., a region inside a gene."The notion of the cistron .e., gene... must be replaced by that of a transcription unit containing regions which will be lost from the mature messenger – which I suggest we call introns (for intragenic regions) – alternating with regions which will be expressed – exons." (Gilbert 1978) The term ''intron'' refers to both the DNA sequence within a gene and the corresponding RNA sequence in RNA transcripts. The non-intron sequences that become joined by this RNA processing to form the mature RNA are called exons. Introns are found in the genes of most eukaryotes and many eukaryotic viruses, and they can be located in both protein-coding genes and genes that function as RNA ( noncoding genes). There are four main types of introns: tRNA introns, group I introns, group I ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fibrinogen
Fibrinogen (coagulation factor I) is a glycoprotein protein complex, complex, produced in the liver, that circulates in the blood of all vertebrates. During tissue and vascular injury, it is converted Enzyme, enzymatically by thrombin to fibrin and then to a fibrin-based Thrombus, blood clot. Fibrin clots function primarily to occlude blood vessels to stop bleeding. Fibrin also binds and reduces the activity of thrombin. This activity, sometimes referred to as antithrombin I, limits clotting. Fibrin also mediates blood platelet and endothelial cell spreading, tissue fibroblast proliferation, Capillary action, capillary tube formation, and angiogenesis and thereby promotes revascularization and wound healing. Reduced and/or dysfunctional fibrinogens occur in various congenital and acquired human List of fibrinogen disorders, fibrinogen-related disorders. These disorders represent a group of rare conditions in which individuals may present with severe episodes of pathological bleed ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ancient Greek
Ancient Greek (, ; ) includes the forms of the Greek language used in ancient Greece and the classical antiquity, ancient world from around 1500 BC to 300 BC. It is often roughly divided into the following periods: Mycenaean Greek (), Greek Dark Ages, Dark Ages (), the Archaic Greece, Archaic or Homeric Greek, Homeric period (), and the Classical Greece, Classical period (). Ancient Greek was the language of Homer and of fifth-century Athens, fifth-century Athenian historians, playwrights, and Ancient Greek philosophy, philosophers. It has contributed many words to English vocabulary and has been a standard subject of study in educational institutions of the Western world since the Renaissance. This article primarily contains information about the Homeric Greek, Epic and Classical periods of the language, which are the best-attested periods and considered most typical of Ancient Greek. From the Hellenistic period (), Ancient Greek was followed by Koine Greek, which is regar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nuclear DNA
Nuclear DNA (nDNA), or nuclear deoxyribonucleic acid, is the DNA contained within each cell nucleus of a eukaryotic organism. It encodes for the majority of the genome in eukaryotes, with mitochondrial DNA and plastid DNA coding for the rest. It adheres to Mendelian inheritance, with information coming from two parents, one male and one female—rather than matrilineally (through the mother) as in mitochondrial DNA. Structure Nuclear DNA is a nucleic acid, a polymeric biomolecule or biopolymer, found in the nucleus of eukaryotic cells. Its structure is a double helix, with two strands wound around each other, a structure first described by Francis Crick and James D. Watson (1953) using data collected by Rosalind Franklin. Each strand is a long polymer chain of repeating nucleotides. Each nucleotide is composed of a five-carbon sugar, a phosphate group, and an organic base. Nucleotides are distinguished by their bases: purines, large bases that include adenine and gu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
