(from the article "steroid") The molting hormones (zooecdysones) of insects and crustaceans are generally derivatives of cholestane. All possess a ketone group at position 6, a double bond between positions 7 and 8, and 2beta-, 3beta-, and 14alpha-hydroxyl groups. The side chain is hydroxylated ...
any flagellate protozoan that is traditionally of the protozoan class Zoomastigophorea (sometimes called Zooflagellata), although recent classifications of this group have questioned the taxonomic usefulness of the term because some zooflagellates have been found to have photosynthetic capabilities and some ... [4 Related Articles]
the branch of the science of biogeography (q.v.) that is concerned with the geographic distribution of animal species. In addition to mapping the present distribution of species, zoogeographers formulate theories to explain the distribution, based on information about geography, physiography, ... [2 Related Articles]
(from the article "bacteria") ...colonizes the lungs of persons with cystic fibrosis, it produces a thick capsular polymer of alginic acid that contributes to the difficulty of eradicating the bacterium. Bacteria of the genus Zoogloea secrete fibres of cellulose that enmesh the bacteria into ...
(from the article "cnidarian") Although genetically identical, colony members of many hydrozoans and some anthozoans are polymorphic, differing in morphology (form and structure) and/or physiology. Each zooid within the colony has a specific function and varies somewhat in form. For example, gastrozooids bear tentacles ...
(from the article "zoo") ...still flourishes, was opened to the public in 1765. In 1775 a zoo was founded in a Royal Park in Madrid, and 18 years later the zoological collection of the Jardin des Plantes, Paris, was begun. The Zoological Society of ...
(from the article "Philadelphia Zoological Gardens") ...zoo in the United States, opened in Philadelphia, Pennsylvania, in 1874 with an animal inventory of several hundred native and exotic specimens. It was begun and continues to be operated by the Zoological Society of Philadelphia, founded in 1859. In ...
branch of biology that studies the members of the animal kingdom and animal life in general. It includes both the inquiry into individual animals and their constituent parts, even to the molecular level, and the inquiry into animal populations, entire ... [20 Related Articles]
(from the article "motion-picture technology") Long experience with both motion-picture and still cameras has shown the need for a variety of focal lengths (ranging from ultrawide angle to telephoto) to photograph scenes under the best conditions. To make changing focal lengths more convenient, the lenses ...
any infectious disease transmitted between humans and other vertebrate animals. The term was originally defined to describe a group of diseases that humans may acquire from domestic animals. This definition has been modified to include all human diseases that are ... [5 Related Articles]
(from the article "fungus") ...body) or ectoparasitic (lives on the body) on nematodes, protozoa, and fungi; thallus branched or unbranched; asexual and sexual reproduction; contains one order.Parasitic on amoebas, rotifers, nematodes, and other protozoa; asexual reproduction by conidia borne singly or in chains, ...
(from the article "fungus") ...become septate; example genera include Entomophthora, Ballocephala, Conidiobolus, Entomophaga, and Neozygites.Endoparasitic (lives in the body) or ectoparasitic (lives on the body) on nematodes, protozoa, and...
sexual relations between a human being and an animal. Although the practice is illegal in most countries, occasional zoophilic encounters are fairly common, especially in rural areas, where 17 percent of U.S. males in the Kinsey report of 1948 acknowledged ... [1 Related Articles]
small floating or weakly swimming organisms that drift with water currents and, with phytoplankton, make up the planktonic food supply upon which almost all oceanic organisms are ultimately dependent. Many animals, from single-celled Radiolaria to the eggs or larvae of ... [6 Related Articles]
(from the article "Muybridge, Eadweard") ...could never assume such unlikely positions. To counter such criticism, Muybridge gave lectures on animal locomotion throughout the United States and Europe. These lectures were illustrated with a zoopraxiscope, a lantern he developed that projected images in rapid succession onto ...
(from the article "algae") ...(walled, nonflagellate, spherical cells) that are carried by water currents and upon germination produce a new organism. Some green algae produce nonmotile spores called aplanospores. In contrast, zoospores lack true cell walls and bear one or more flagella. These flagella ...
(from the article "Los Angeles") ...and Japanese Americans were rounded up in the Los Angeles area and interned at camps inland. Racial tensions between sailors and local Mexican American youths exploded in the so-called "Zoot Suit Riots" (June 3-10, 1943). The servicemen targeted Latino youths ...
(from the article "Representative animals poisonous when eaten") Poisonous animals are widely distributed throughout the animal kingdom; the only major group that seems to be exempt is the birds. biotoxin categoriespoisonPoisons of biological origin...into three major categories: (1) ...
flagellate protozoan (or alga) with yellow or brown pigments contained in chromatophores that lives in other protozoa (foraminiferans and radiolarians) and in some invertebrates. In illuminated conditions, zooxanthellae use the carbon dioxide and waste materials of the host, supplying oxygen ... [4 Related Articles]
in the Book of Job (2:11, 11:1, 20:1, 42:9), one of the three comforters of Job, a biblical archetype of the good man whose misfortunes are undeserved. Like the other two comforters, Bildad and Eliphaz, Zophar emphasizes an old Hebrew ... [1 Related Articles]
(from the article "Mixe-Zoquean") group of Middle American Indian peoples inhabiting territories in southern Mexico. The Mixe-Zoquean peoples today comprise the Mixe, living in northeastern Oaxaca; the Zoque, primarily inhabiting northwestern Chiapas; and the Popoluca (not to be confused with the Popoloca), who live ...
(from the article "Mixe-Zoque languages") family of North American Indian languages spoken in southern Mexico. There are seven languages in the family, divided into two branches, or divisions-Zoquean and Mixean. Zoque is spoken in the Mexican states of Chiapas, Tabasco, and Oaxaca. Sierra Popoluca and ...
U.S. traditionalist sculptor of simple, figurative subjects who was a leading figure in the early 20th-century revival of direct carving, whereby the sculptor seeks his image directly from the material to be carved, relying on neither the inspiration of models ... [1 Related Articles]
any of a small group of about 30 species of insects found on every continent except Europe. These minute insects are less than 3 mm (18 inch) long and have chewing mouthparts and nine-segmented antennae. Most species are wingless and ... [1 Related Articles]
(Ictonyx [sometimes Zorilla] striatus), African carnivore of the weasel family (Mustelidae), frequenting diverse habitats. It has a slender body, 29-39 centimetres (12-16 inches) long, and a bushy white tail, 21-31 cm long. Its fur is long and black, white striped ... [1 Related Articles]
German-born dancer and actress (b. Jan. 2, 1917, Berlin, Ger.-d. April 9, 2003, Santa Fe, N.M.), was a ballerina with the Ballet Russe de Monte Carlo for three years before attracting greater notice in 1936 as the star of the ...
statement in the language of set theory, equivalent to the axiom of choice, that is often used to prove the existence of a mathematical object when it cannot be explicitly produced. [1 Related Articles]
(from the article "Performing Arts") ...by Laurence Holder. Bassist Christian McBride was named co-director, along with arranger Loren Schoenberg, of the Jazz Museum in Harlem, a project that had yet to find a permanent home. Saxophonist John Zorn, whose Tzadik label issued CDs by exploratory ...
(from the article "Zorn's lemma") In 1935 the German-born American mathematician Max Zorn proposed adding the maximum principle to the standard axioms of set theory (see the table). (Informally, a closed collection of sets contains a maximal member-a set that cannot be contained in any ...
(from the article "Seven Years' War") ...most of Britain's military and naval efforts to achieving success against the French in India and, especially, North America. In the meantime, Frederick beat back the Russians in a bloody battle at Zorndorf on August 25, but his attempt to ...
(from the article "calendar") ...the accession day. The Seleucids and, afterward, the Parthian rulers of Iran maintained the Babylonian calendar. The fiscal administration in northern Iran, from the 1st century BC, at least, used Zoroastrian month and day names in documents in Pahlavi (the ...
the ancient pre-Islamic religion of Iran that survives there in isolated areas and, more prosperously, in India, where the descendants of Zoroastrian Iranian (Persian) immigrants are known as Parsis, or Parsees. In India the religion is called Parsiism. [69 Related Articles]
(from the article "Netherlands, The") ...shift in attitudes. Although the baptism of the future queen was a private, rather than a state, affair, it marked the first public appearance in The Netherlands of Princess Maxima's father, Jorge Zorreguieta, whose political past in Argentina had been ...
Uruguayan poet famous for a long historical verse epic, Tabare (1886; final edition after several revisions, 1926), a poem in six cantos, based upon a legend of the love between a Spanish girl and an Indian boy. [1 Related Articles]
poet and dramatist, the major figure of the nationalist wing of the Spanish Romantic movement. His work was enormously popular and is now regarded as quintessentially Spanish in style and tone. [1 Related Articles]
(from the article "Romance languages") ...both the east and west since the 1800s. Friulian retains its vitality in the well-populated, industrialized region, however, and supports a vigorous local literature; its most notable poet was Pieri Zorut (1792-1867). The first written specimen of Friulian (apart from ...
town, northwestern Liberia, West Africa. It is situated along the road from Monrovia to Sierra Leone. A local trade centre for agricultural products (rice, cassava, pineapples, and palm oil and kernels) grown by the Kpelle and Loma peoples of the ...
(from the article "alchemy") Western alchemy may go back to the beginnings of the Hellenistic period (c. 300 BC-c. AD 300), although the earliest alchemist whom authorities have regarded as authentic is Zosimos of Panopolis (Egypt), who lived near the end of the period. ...
pope from March 417 to December 418. He was consecrated as Pope St. Innocent I's successor on March 18, 417. His brief but turbulent pontificate was embroiled in conflicts involving Gaul, Africa, and Pelagianism, a heretical doctrine that minimized the ... [1 Related Articles]
(from the article "Health and Disease") ...characterized by a blistering rash. Shingles is caused by reactivation of the herpes zoster virus, which causes chickenpox; anyone who has had chickenpox is at risk for shingles. The vaccine, Zostavax, which was meant for people aged 60 and older, ...
(from the article "chickenpox") Injections of zoster immune globulin (ZIG), a preparation made from the plasma of adults who have recently had herpes zoster, are sometimes given to prevent the development of chickenpox in exposed children. ZIG contains antibodies to varicella-zoster virus and provides ...
(from the article "boundary ecosystem") Sea-grass beds are found just below low-tide mark in all latitudes. In north temperate waters Zostera is the most common genus, while in tropical climates Thalassia, known as turtle grass, is an important element. As with marsh grasses, it seems ...
(from the article "eelgrass") The Zosteraceae, commonly called the eelgrass family, is remarkable for Zostera marina (grass weed or grass wrack), an important tidewater plant whose dried leaves have been used for packing glass articles and for stuffing cushions.dugong grass
(from the article "white-eye") any of the 80 to 85 species of birds of the Old World family Zosteropidae (order Passeriformes). They are so much alike that about 60 of them are often lumped in a single genus, Zosterops. White-eyes occur chiefly from Africa ...
(from the article "Basra") ...al-Ash'ath's revolt in 701 and al-Muhallab's revolt in 719-720. Conditions did not improve under the 'Abbasids, who took over the caliphate in 750. The uprisings continued: the Zott, an Indian people, rose up in 820-835; the Zanj, African blacks brought ...
Chinese cosmologist of the ancient state of Qi (in present-day Shandong) and leading exponent of the Yinyang school. The only account of his life is a brief one in the Shiji ("Record of the Historian"). To him is attributed the ... [1 Related Articles]
English jurist, one of the founders of international law, who became regius professor of civil law at Oxford and later practiced successfully in London. [1 Related Articles]
