| | - zygodactyly
- (from the article "cuckoo") ...have long (sometimes extremely long), graduated tails, usually with the individual feathers tipped with white. The legs vary from medium to rather long (in the terrestrial forms) and the feet are zygodactyl; i.e., the outer toe is reversed, pointing backward. ...
- Zygogynum
- (from the article "Canellales") ...new genus, Tasmannia (with about 40 species), which extends from the Philippines to Australia (including Tasmania) and reaches its greatest diversity in New Guinea. The circumscription of Zygogynum is still controversial; it may be recognized in a reduced way to ...
- zygomatic arch
- bridge of bone extending from the temporal bone at the side of the head around to the maxilla (upper jawbone) in front and including the zygomatic (cheek) bone as a major portion. The masseter muscle, important in chewing, arises from ... [2 Related Articles]
- zygomatic bone
- diamond-shaped bone below and lateral to the orbit, or eye socket, at the widest part of the cheek. It adjoins the frontal bone at the outer edge of the orbit and the sphenoid and maxilla within the orbit. It forms ... [2 Related Articles]
- zygomatic major
- (from the article "humour") ...produced by the coordinated contraction of 15 facial muscles in a stereotyped pattern and accompanied by altered breathing. Electrical stimulation of the main lifting muscle of the upper lip, the zygomatic major, with currents of varying intensity produces facial expressions ...
- zygomaticofacial nerve
- (from the article "nervous system, human") ...of the maxillary sinus, (3) the nasal and palatine nerves, which serve portions of the nasal cavity and the mucosa of the hard and soft palate, and (4) the infraorbital, zygomaticotemporal, and zygomaticofacial nerves, serving the upper lip, the lateral ...
- zygomaticotemporal nerve
- (from the article "nervous system, human") ...and gingiva and the lining of the maxillary sinus, (3) the nasal and palatine nerves, which serve portions of the nasal cavity and the mucosa of the hard and soft palate, and (4) the infraorbital, zygomaticotemporal, and zygomaticofacial nerves, serving ...
- zygomorphic flower
- (from the article "flower") ...(see photograph), as in roses and petunias, in which case it is termed regular or actinomorphic. A bilaterally symmetrical flower, as in orchids (see photograph) and snapdragons, is irregular or zygomorphic.floral symmetry
- Zygopetalum
- genus of about 15 species of tropical American orchids, family Orchidaceae, that are cultivated as ornamentals. All species grow on other plants and have egg-shaped pseudobulbs (swollen stems) that bear two or more long, thin leaves. The flowering spike is ...
- Zygopetalum intermedium
- (from the article "Zygopetalum") Zygopetalum flowers have green petals and sepals, spotted with purple or brown, and a white lip streaked with purple. Two similar species, Z. mackayi and Z. intermedium, are commonly cultivated for their long-lasting, fragrant flowers.
- Zygopetalum mackayi
- (from the article "Zygopetalum") Zygopetalum flowers have green petals and sepals, spotted with purple or brown, and a white lip streaked with purple. Two similar species, Z. mackayi and Z. intermedium, are commonly cultivated for their long-lasting, fragrant flowers.
- Zygophyllaceae
- (from the article "Zygophyllales") Zygophyllaceae, or the bean caper family, is a loose-knit assemblage of 22 genera and 285 species that mainly grow in the desert or saline environments of temperate and tropical regions. Most members are shrubs to small trees, often resinous, with ...
- Zygophyllales
- the creosote bush order of dicotyledonous flowering plants, consisting of 2 families (Zygophyllaceae and Krameriaceae), 27 genera, and about 300 species. Members are herbs or shrubs, rarely hemiparasites, and largely restricted to tropical or temperate arid or saline regions. The ...
- zygosphene
- (from the article "snake") ...(prezygapophyses and postzygapophyses) from the centra, with articulating surfaces that lie above and below; and finally the zygosphenes and zygantra, found almost exclusively in snakes, the zygosphene being a projecting shelf on the upper part of the vertebra and the ...
- zygospore
- (from the article "algae") In freshwater organisms especially, the fertilized egg, or zygote, often passes into a dormant state called a zygospore. Zygospores generally have a large store of food reserves and a thick, resistant cell wall. Following an appropriate environmental stimulus, such as ...
- zygote
- (from the article "development") ...of the diploid parents; gametes from the two parents immediately reunite to form a diploid embryo, without an intervening haploid generation. The male sperm fertilizes a female ovum to form the zygote, which immediately begins to divide into many smaller ...
- Zyklon-B
- (from the article "Holocaust") ...camps, the Nazis used mobile gas vans. Elsewhere, they built permanent gas chambers linked to the crematoria where bodies were burned. Carbon monoxide was the gas of choice at most camps. Zyklon-B, an especially lethal killing agent, was employed primarily ...
- zymogen
- any of a group of proteins that display no catalytic activity but are transformed within an organism into enzymes, especially those that catalyze reactions involving the breakdown of proteins. Trypsinogen and chymotrypsinogen, zymogens secreted by the pancreas, are activated in ... [1 Related Articles]
- zymogenic cell
- (from the article "gastric gland") The intermediate gastric glands produce most of the digestive substances secreted by the stomach. These glands are narrow tubules composed of three major cell types: zymogenic, parietal, and mucous neck cells. At the base of the gland are the zymogenic ...
- Zyryan
- city, eastern Kazakhstan, on the Beryozovka River in the southern Altai Mountains. Zyryan is an important centre of the lead- and zinc-mining industry, which first came into being when rich deposits of polymetallic ores were discovered there in 1794 by ...
- Zyuganov, Gennady Andreyevich
- Of the independent nations that emerged after the dissolution of the Soviet Union, Russia had appeared to be among the most eager to embrace the free market. For many, however, the promises of a capitalist society never materialized. Economic power ... [1 Related Articles]
- Zywiec
- town, Slaskie wojewodztwo (province), south-central Poland, in the Carpathian Mountains on the Sola River near the border with Slovakia. It lies at the foot of Grojec Mountain, which has made it an important tourist centre. The town ...
- Zywny, Wojciech Adalbert
- (from the article "Chopin, Frederic") ...mother or eldest sister playing the piano. By six he was already trying to reproduce what he heard or to make up new tunes. The following year he started piano lessons with the 61-year-old Wojciech Zywny, an all-around musician with ...
- ZZ Top
- (from the article "MTV") ...wave icons Duran Duran, who used increasingly sophisticated techniques to make the visual elements of the video as important as the music. MTV also gave renewed life to veteran performers such as ZZ Top, Tina Turner, and Peter Gabriel, each ...
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