John Munonye: In The Only Son (1966), Munonye’s first novel, a widowed mother navigates traditional expectations for Igbo women as she raises her son, who then attends a Western-oriented school and converts to Christianity. Obi (1969), a sequel to The Only Son, broadens the theme to an extended…

Julian Barnes: Novels and short stories: In The Only Story (2018), Barnes explores memory and first love as a man looks back on his relationship with an older woman. In 2022 he published Elizabeth Finch, which centers on a man whose intellectual crush on one of his teachers has a lasting impact…

Jeff Bridges: He then appeared in Only the Brave (2017), a drama that chronicles the real-life efforts of a group of elite firefighters (the Granite Mountain Hotshots) to contain the Arizona wildfires during the summer of 2013. Bridges also had roles in the spy movie Kingsman: The Golden Circle and the…

Roy Orbison: “Only the Lonely” (1960), “Crying” (1961), “It’s Over” (1964), and “Oh, Pretty Woman” (1964) were all hits, and Orbison was one of the few American rockers to maintain a place high on the pop charts during the British Invasion. After a series of personal tragedies…

Frank Sinatra: The Capitol years: …for Swingin’ Lovers! (1956), and Only the Lonely (1958)—are masterpieces.

Kieran Culkin: Family and early career: …of the Bride (1991) and Only the Lonely (1991), often alongside one or two of his siblings. The Culkin children achieved varying levels of success over the courses of their acting careers: Macaulay became one of the most famous child stars of all time after his iconic role in Home…

Len Deighton: In Only When I Larf (1968), Deighton moved from the subject of spies to confidence tricksters. In the suspense novel Bomber (1970), he treated a misdirected bombing mission of World War II.

Dato’ Onn bin Jaafar was a Malayan political figure who played a leading role in the Merdeka (independence) movement and the establishment of the Federation of Malaya, forerunner of the present country of Malaysia. Born in the sultanate of Johore (later the state of Johor), north of Singapore, Onn

Kaibara Ekken: To Kaibara is usually attributed Onna daigaku (“The Great Learning for Women”), long considered the most important ethical text for women in Japan, which advocates women’s obedience to their parents, parents-in-law, husband, and, if widowed, to their eldest son. Kaibara, however, treated his wife, Tōken, to whom he was happily…

Okuni: The popularity of onna (“women’s”) Kabuki remained high until women’s participation was officially banned in 1629 by the shogun (military ruler) Tokugawa Iemitsu, who thought that the sensuality of the dances had a deleterious effect on public morality. Not only were the dances considered suggestive, but the dancers…

hiragana, one of two sets of syllabic Japanese script. It is the set used to write Japanese grammatical particles as well as native Japanese words whose kanji (ideogram) is either obscure or nonextant. The other set, katakana, is largely reserved for scientific terms, official documents, and words

hiragana, one of two sets of syllabic Japanese script. It is the set used to write Japanese grammatical particles as well as native Japanese words whose kanji (ideogram) is either obscure or nonextant. The other set, katakana, is largely reserved for scientific terms, official documents, and words

Japanese performing arts: Tokugawa period: …Namboku wrote for the finest onnagata (female impersonator) of his time, Iwai Hanshirō V, and Mokuami wrote for Ichikawa Danjūrō IX and a remarkable actor of gangster roles, Ichikawa Kodanji IV. Each was a master of Kabuki art, and between them they added new dimensions to Kabuki’s stylized form. Namboku…

Enchi Fumiko: Masks) depicts, by invoking the various female masks used in the Noh dramas, different unhappy women. Enchi’s early background in Japanese classical literature is revealed in her allusions not only to the Noh plays but to the 11th-century classic Genji monogatari (The Tale of Genji).

Enchi Fumiko: The Waiting Years), an account of a woman of the Meiji period (1868–1912) who defers to all her husband’s wishes, even choosing mistresses for him. The novel, based in part on the life of Enchi’s grandmother, is beautifully written. It not only won Enchi a…

Heike Kamerlingh Onnes was a Dutch winner of the Nobel Prize for Physics in 1913 for his work on low-temperature physics and his production of liquid helium. He discovered superconductivity, the almost total lack of electrical resistance in certain materials when cooled to a temperature near

Yoko Ono is a Japanese artist and musician who was an influential practitioner of conceptual and performance art in the 1960s and who became internationally famous as the wife and artistic partner of musician John Lennon. Ono was born into a wealthy family in Japan and grew up mostly in Tokyo,

ikebana: …Japan, Ikenobō, was founded by Ono no Imoko in the early 7th century. Based on a harmony of simple linear construction and an appreciation of the subtle beauty of flowers and natural material, ikebana has separated into several major schools according to historical periods and differing theories of artistic composition.…

Ono Tōfū was a Japanese calligrapher known as one of the Sanseki (“Three Brush Traces”), in effect the first calligraphers of the age. The others were Fujiwara Yukinari and Fujiwara Sukemasa, and the three perfected the style of writing called jōdai-yō (“ancient style”). Ono was the son of a high

Yoko Ono is a Japanese artist and musician who was an influential practitioner of conceptual and performance art in the 1960s and who became internationally famous as the wife and artistic partner of musician John Lennon. Ono was born into a wealthy family in Japan and grew up mostly in Tokyo,

plant reproductive system: Ferns: In Onoclea sensiblis, the gametophytes are unisexual in early development, thus favouring cross-fertilization, but later the gametophytes become bisexual so that, if cross-fertilization fails, the species can still be maintained.

fern: Annotated classification: Family Onocleaceae Plants in soil; rhizomes short- to long-creeping or erect (occasionally trunklike in Onocleopsis), scaly, sometimes with runners; leaves strongly dimorphic, the vegetative leaves one time pinnately compound, the leaflets sometimes deeply lobed, the fertile leaves one to three times pinnately compound, with contracted laminar…

Japanese performing arts: Meiji period: Thus, the actor Onoe Kikugorō V began acting in a series of contemporary plays, dressed in daily kimono or Western clothes and with his hair cut Western fashion (the origin of zangirimono, or the so-called “cropped-hair plays”), in the late 19th century. Western influence also was seen in…

Onoe Shōroku II, was a Japanese kabuki actor, one of the foremost interpreters of the classical kabuki plays, who specialized in female roles (all kabuki players are male). Yutaka Fujima made his debut at the age of five as Ushiwakamaru at the Teikoku Theatre in the kabuki drama Shusse Kagekiyo,

ancient Greek civilization: Macedonian supremacy in Greece: …leaders were Philomelus, followed by Onomarchus, Phayllus, and finally Phalaecus. The actual declaration of the Sacred War was delayed until 355, partly because it was only in that year that the relative impotence of one of Phocis’s hitherto most-impressive-looking allies, the Athenians, was revealed by the miserable end to the…

theatre: Visual and spatial aspects: …writer Vitruvius, and in the Onomasticon, of the 2nd century ce, by the Greek scholar Julius Pollux. As these treatises appeared several hundred years after classical theatre, however, the accuracy of their descriptions is questionable.

name: The science of onomastics: The science that studies names in all their aspects is called onomastics (or onomatology—an obsolete word). The subject of this science is broad because almost everything can have a name and because the study of names theoretically encompasses all languages, all…

Hesychius Of Miletus: His Onomatologos ē pinax tōn en paideia onomastōn (“Nomenclature, or Index of Famous Persons in Learning”) is significant for its biographical notices of notable Greek writers. In it the authors were classified as poets, philosophers, historians, orators-grammarians, medical men, and miscellaneous writers. In each category the…

onomatopoeia, the naming of a thing or action by a vocal imitation of the sound associated with it (such as buzz or hiss). Onomatopoeia may also refer to the use of words whose sound suggests the sense. This occurs frequently in poetry, where a line of verse can express a characteristic of the

Onomichi, city, southeastern Hiroshima ken (prefecture), western Honshu, Japan. It lies on the Inland Sea, just southwest of Fukuyama. The city’s port opened in 1168 and served for about 500 years as a rice shipment centre and port of call for trade with China. The port’s commercial significance

Onondaga, tribe of Iroquoian-speaking North American Indians who lived in what is now the U.S. state of New York. The Onondaga traditionally inhabited villages of wood and bark longhouses occupied by related families. They moved these houses periodically to plant new fields, to seek fresh supplies

Onondaga, county, central New York state, U.S., bounded by the Oswego and Oneida rivers to the north, Oneida Lake to the northeast, De Ruyter Reservoir to the southeast, Skaneateles Lake to the southwest, and Cross Lake to the west. It comprises a marshy lowland in the north and a hilly plateau

Poland: The Second Republic: …its fascist splinter party, the National Radical Camp; and the socialists all opposed the regime and achieved success in municipal elections. Socioeconomic tension was translated into peasant strikes in the countryside and riots in towns.

Lars Onsager was a Norwegian-born American chemist whose development of a general theory of irreversible chemical processes gained him the 1968 Nobel Prize for Chemistry. His early work in statistical mechanics attracted the attention of the Dutch chemist Peter Debye, under whose direction Onsager

Fairchild Semiconductor: …by ON Semiconductor (after 2022, onsemi).

Jacksonville, city, seat (1755) of Onslow county, southeastern North Carolina, U.S. It lies along the New River at the head of its estuary, about 50 miles (80 km) northeast of Wilmington. Originally settled as Wantland’s Ferry (c. 1757), its name was changed to Onslow Courthouse and then

Muriel Wheldale Onslow was a British biochemist whose study of the inheritance of flower colour in the common snapdragon (Antirrhinum majus) contributed to the foundation of modern genetics. She also made important discoveries concerning the biochemistry of pigment molecules in plants, particularly

Mount Ontake, mountain, rising to an elevation of 10,049 feet (3,063 m) on the boundary of Gifu and Nagano prefectures, central Honshu, Japan. A compound volcano with a heavy snow mantle in winter, it is second only to Mount Fuji in elevation and popular esteem. Mount Ontake is an object of worship

Mount Ontake, mountain, rising to an elevation of 10,049 feet (3,063 m) on the boundary of Gifu and Nagano prefectures, central Honshu, Japan. A compound volcano with a heavy snow mantle in winter, it is second only to Mount Fuji in elevation and popular esteem. Mount Ontake is an object of worship

Ontario, city, San Bernardino county, southern California, U.S. It is situated in the Riverside–San Bernardino portion of the consolidated Los Angeles metropolitan area on the site of the Spanish colonial Rancho Cucamonga. Named for the province of Ontario in Canada, it was settled in 1882 by

Ontario, second largest province of Canada in area, after Quebec. It occupies the strip of the Canadian mainland lying between Hudson and James bays to the north and the St. Lawrence River–Great Lakes chain to the south. It is bordered to the east by the province of Quebec, to the south by the

Ontario, county, western New York state, U.S., located southeast of Rochester and bounded by Seneca Lake to the east, Canandaigua Lake to the southeast, and Hemlock Lake and Honeoye Creek to the west. The northern part of the county comprises a lowland region, while the southern section contains

Ontario, city, Malheur county, eastern Oregon, U.S. It lies at the juncture of the Snake and Malheur rivers, 60 miles (97 km) west of Boise, Idaho, on the historic Oregon Trail. A gateway to the Oregon cattle country, it grew after the building of the Union Pacific Railroad in 1884 and was named

Titan: The surface of Titan: A smaller lake, Ontario Lacus, with a shrinking shoreline, has been observed in the south polar region. Reflections of the Sun have been observed on the lakes that confirm that they are filled with liquids rather than ice or sand.

ice hockey: Early organization: …hockey in 1908 when the Ontario Professional Hockey League was formed. By that time Canada had become the center of world hockey.

museum: Other national and regional museums: …Ontario Museum in Toronto, the Ontario Provincial Museum, was founded in 1855. In Australia the National Museum of Victoria was established at Melbourne in 1854; it was followed by the National Gallery of Victoria in 1861 and the Science Museum of Victoria in 1870. In Cairo the Egyptian Museum was…

Ontario Science Centre, science and technology museum in Toronto, Ontario, Canada. Founded in 1964 and officially opened in 1969 in Toronto’s Flemingdon Park neighborhood, it offered major collections in aeronautics, agriculture, anatomy, botany, mineralogy, textiles, and other areas. It also made

The coat of arms of Ontario was authorized on May 26, 1868, by Queen Victoria, at the same time that the first Canadian coat of arms was authorized. The arms of Ontario consisted of a shield divided into two sections. The bottom half showed a green background with three golden maple leaves on a

Lake Ontario, smallest and most easterly of the Great Lakes of North America. It is bounded on the north by Ontario (Can.) and on the south by New York (U.S.). The lake is roughly elliptical; its major axis, 193 miles (311 km) long, lies nearly east to west, and its greatest width is 53 miles (85

Harry Mulisch: …ontdekking van de hemel (1992; The Discovery of Heaven; filmed 2001) increased Mulisch’s international presence with its discussion of the theological questions raised by science. De procedure (1998; The Procedure) echoes the Jewish golem myth with the story of a scientist who creates life from crystals found in clay. Siegfried…

surjection, in mathematics, a mapping (or function) between two sets such that the range (output) of the mapping consists of every element of the second set. A mapping that is both an injection (a one-to-one correspondence for all elements from the first set to elements in the second set) and a

operant conditioning, in psychology and the study of human and animal behaviour, a mechanism of learning through which humans and animals come to perform or to avoid performing certain behaviours in response to the presence or absence of certain environmental stimuli. The behaviours are

ontogeny, all the developmental events that occur during the existence of a living organism. Ontogeny begins with the changes in the egg at the time of fertilization and includes developmental events to the time of birth or hatching and afterward—growth, remolding of body shape, and development of

Stephen Jay Gould: In his books Ontogeny and Phylogeny (1977), The Mismeasure of Man (1981), Time’s Arrow, Time’s Cycle (1987), and Wonderful Life (1989), he traced the course and significance of various controversies in the history of evolutionary biology, intelligence testing, geology, and paleontology. From 1974 Gould regularly contributed essays to…

Johann Clauberg: In his Ontologia sive Metaphysica de Ente (1660; “Ontology or Metaphysics of Being”), Clauberg sought to reconcile Cartesian doctrines with the metaphysical positions of his pre-Cartesian Ontosophia (1647; “The Wisdom of Being”).

ontological argument, Argument that proceeds from the idea of God to the reality of God. It was first clearly formulated by St. Anselm in his Proslogion (1077–78); a later famous version is given by René Descartes. Anselm began with the concept of God as that than which nothing greater can be

universal: Plenitudes from abstract reference: …some version of the “criterion of ontological commitment,” introduced by the American philosopher Willard Van Orman Quine. The criterion says that there is only one way to be sure about the ontological commitments of a philosopher’s theory—i.e., what would have to exist for the theory to be true. One…

individualism: …closely related view, sometimes called ontological individualism, is the thesis that social or historical groups, processes, and events are nothing more than complexes of individuals and individual actions. Methodological individualism precludes explanations that appeal to social factors that cannot in turn be individualistically explained. Examples are Durkheim’s classic account of…

philosophy of biology: Molecular biology: Ontological reductionism is the metaphysical doctrine that entities of a certain kind are in reality collections or combinations of entities of a simpler or more basic kind. The pre-Socratic doctrine that the physical world is ultimately composed of different combinations of a few basic elements—e.g.,…

Vincenzo Gioberti: …his system is usually termed “ontologism.” He coined the term “palingenesis” to indicate the return of human concepts to the essential centre of being from which they become divorced. This reunion of the ideal and the real provided Gioberti a means of describing the actualization in human life of the…

Stanisław Leśniewski: Major work in logic: …from the Greek, of protothetic, ontology, and mereology (q.v.). The logical basis of the whole theory, and hence its name (prōtos, “first”), is provided by protothetic, which is the most comprehensive theory yet developed of the relations between propositions. The other two systems are based on a distinction the lack…

ontology, the philosophical study of being in general, or of what applies neutrally to everything that is real. It was called “first philosophy” by Aristotle in Book IV of his Metaphysics. The Latin term ontologia (“science of being”) was felicitously invented by the German philosopher Jacob

Ontong Java Atoll, atoll in the country of Solomon Islands, southwestern Pacific Ocean, 160 miles (257 km) north of Santa Isabel Island. A large coral formation measuring some 20 miles (32 km) by 50 miles (80 km), the atoll was visited by the Dutch navigator Abel Janszoon Tasman in 1643 and was

Heliopolis, one of the most ancient Egyptian cities and the seat of worship of the sun god, Re. It was the capital of the 15th nome of Lower Egypt, but Heliopolis was important as a religious rather than a political centre. During the New Kingdom (c. 1539–1075 bce) its great temple of Re was second

Huelva, city and port, capital of Huelva provincia (province), in the comunidad autónoma (autonomous community) of Andalusia, southwestern Spain. The city lies on the western shore of a peninsula formed by the estuaries of the Odiel and Tinto rivers, which empty into the Gulf of Cádiz of the

Puffy AmiYumi: The group’s two lead singers—Ami Onuki (b. September 18, 1973, Tokyo, Japan) and Yumi Yoshimura (b. January 30, 1975, Osaka, Japan)—captured their audiences through their well-blended voices, their intelligent lyrics and novel musical arrangements, and their vibrant, youthful stage presence.

annelid: Annotated classification: Lumbineris, Onuphis. Order Orbiniida Sedentary; head pointed or rounded without appendages; proboscis eversible and unarmed; body divided into distinct thorax and abdomen; gills arise dorsally from thoracic region; size, minute to 40 cm; examples of genera: Scoloplos, Paraonis.

Onverwacht series, division of Archean rocks (the Archean Eon lasted from 3.96 to 2.5 billion years ago) in the Swaziland region of southern Africa. The Onverwacht series is well known from exposures in the Komati valley in the eastern Transvaal region, South Africa, where Onverwacht rocks consist

Tom Holland: Spider-Man stardom and other roles: …Spies in Disguise (2019) and Onward (2020).

wallaby: …species of nail-tailed wallabies (Onychogalea) are named for a horny growth on the tail tip. They are handsomely striped at the shoulder. Because they rotate their forelimbs while hopping, they are often called organ-grinders. Two species are endangered.

grasshopper mouse, (genus Onychomys), any of three species of terrestrial, nocturnal, insectivorous and carnivorous mice that are physiologically adapted to semiarid and arid habitats in the open country of western North America. The northern grasshopper mouse (Onychomys leucogaster) lives in

grasshopper mouse: Mearns’ grasshopper mouse (O. arenicola) ranges from the southwestern United States to central Mexico. The last two species prefer warm, very arid, scrubby desert habitats. All are stout bodied, weighing up to 49 grams (1.7 ounces) and having a body length up to 13 cm…

grasshopper mouse: The northern grasshopper mouse (Onychomys leucogaster) lives in grassland and shrub steppes from central Canada southward through the Great Plains and Great Basin to northern Mexico. The southern grasshopper mouse (O. torridus) is found from southern California, Nevada, and Utah southward to northeastern Mexico. Mearns’ grasshopper…

grasshopper mouse: The southern grasshopper mouse (O. torridus) is found from southern California, Nevada, and Utah southward to northeastern Mexico. Mearns’ grasshopper mouse (O. arenicola) ranges from the southwestern United States to central Mexico. The last two species prefer warm, very arid, scrubby desert habitats. All are stout…

velvet worm, (phylum Onychophora), any of about 70 wormlike species of ancient, terrestrial invertebrates with short, thick legs and a dry, velveteen body. Onychophorans range in size from 14 to 150 mm (about 0.6 to 6 inches) and are found in rainforests. Unable to control water loss, they cannot

velvet worm, (phylum Onychophora), any of about 70 wormlike species of ancient, terrestrial invertebrates with short, thick legs and a dry, velveteen body. Onychophorans range in size from 14 to 150 mm (about 0.6 to 6 inches) and are found in rainforests. Unable to control water loss, they cannot

velvet worm, (phylum Onychophora), any of about 70 wormlike species of ancient, terrestrial invertebrates with short, thick legs and a dry, velveteen body. Onychophorans range in size from 14 to 150 mm (about 0.6 to 6 inches) and are found in rainforests. Unable to control water loss, they cannot

branchiopod: Annotated classification: Infraorder Onychopoda Short-bodied forms with carapace reduced to a dorsal brood pouch; 4 pairs of trunk limbs, which only grasp prey; single large median eye with many visual elements; antennae large, branched, with 12–15 swimming setae; freshwater and marine, with radiation into endemic species in the…

cephalopod: Locomotion: Some squids (Onychoteuthis, Thysanoteuthis) are able to “fly” for several hundred feet, driven into the air by powerful thrusts from their jets and gliding on their expanded fins and arm keels. This normally occurs when the squids are pursued by predatory fishes and dolphins. When the squid…

fungus: Annotated classification: Order Onygenales Forms lichens; asci are formed in a mazaedium (a fruiting body consisting of a powdery mass of free spores interspersed with sterile threads, enclosed in a peridium or wall structure) and are evanescent; included in subclass Eurotiomycetidae; examples of genera include Onygena, Gymnoascus, Trichophyton,…

onyx, striped, semiprecious variety of the silica mineral agate with white and black alternating bands. Onyx is used in carved cameos and intaglios because its layers can be cut to show a colour contrast between the design and the background. Other varieties include carnelian onyx, with white and

marble: The so-called onyx marbles consist of concentric zones of calcite or aragonite deposited from cold-water solutions in caves and crevices and around the exits of springs. They are, in the strict sense, neither marble nor onyx, for true onyx is a banded chalcedony composed largely of silicon…

Antarctica: Relief: The evanescent Onyx River, for example, flows from Lower Wright Glacier terminus to empty into the nondrained basin of Lake Vanda near McMurdo Sound. Glacially sculptured landforms now predominate, as they must have some 300 million years ago, in an earlier period of continental glaciation of all…

Rebecca Yarros: Writing career: The third title, Onyx Storm, broke sales records, selling more than 2.7 million copies in its first week and ranking as the fastest selling adult fiction title in 20 years. In early 2025 Yarros’s publisher said that the Empyrean series had sold more than 12 million copies in…

Kortrijk: The Church of Notre Dame (Onze Lieve Vrouwkerk; 1191–1211), with the attached chapel of the counts of Flanders (1374), contains Anthony Van Dyck’s “Elevation of the Cross” (1631) and a 14th-century statue of St. Catherine. Other historic landmarks in Kortrijk include the Broelbrug (bridge; c. 1400),…

Paulo Coelho: The Alchemist and other works: …humankind; and Onze minutos (2003; Eleven Minutes), which explores the boundaries between love and sex through the story of a prostitute. A bruxa de Portobello (2006; The Witch of Portobello) tells the story of a female religious leader in the form of interviews with those who knew her. O vencedor…

protist: Reproduction and life cycles: …highly resistant stage—for example, the oocyst of the coccidian parasites, which may survive for a long time in the fecal material of the host or in the soil. This cyst is the infective stage for the next host in the parasite’s life cycle.

animal development: Preparatory events: …or egg), derived from an oocyte (immature egg), and the male sex cell (spermatozoon or sperm), derived from a spermatocyte. Eggs are produced in ovaries; sperm, in testes. Both the egg and the sperm contribute to the development of the new individual; each providing one set of genes, thereby restoring…

Oodnadatta, town, northern South Australia. It lies on the Neales River, southwest of the Simpson Desert. Founded in 1890, Oodnadatta served as the northern terminus of the Central Australian Railway (until the railway was extended to Alice Springs some 280 miles [450 km] north-northwest in 1929),

gamete: …advanced form of heterogamy called oogamy. In oogamy one of the gametes is small and motile (the sperm), and the other is large and nonmotile (the egg).

oogenesis, in the human female reproductive system, growth process in which the primary egg cell (or ovum) becomes a mature ovum. In any one human generation, the egg’s development starts before the female that carries it is even born; 8 to 20 weeks after the fetus has started to grow, cells that

archegonium, the female reproductive organ in ferns and mosses. An archegonium also occurs in some gymnosperms, e.g., cycads and conifers. A flask-shaped structure, it consists of a neck, with one or more layers of cells, and a swollen base—the venter—which contains the egg. Neck-canal cells,

sedimentary rock: …or siliceous shell fragments and oöids, which are concentrically layered spherical grains of calcium carbonate. Orthochemical sedimentary rocks, on the other hand, consist of dissolved constituents that are directly precipitated as solid sedimentary rock and thus do not undergo transportation. Orthochemical sedimentary rocks include some limestones, bedded evaporite deposits of…

Ōoka Makoto was a prolific Japanese poet and literary critic who was largely responsible for bringing contemporary Japanese poetry to the attention of the Western world. The son of a tanka poet, Ōoka graduated from the University of Tokyo in 1953 with a degree in literature and subsequently worked

Ōoka Shōhei was a Japanese novelist famous for his depiction of the fate of Japanese soldiers during World War II, in which he served. He was also known for his insightful commentary on human behavior, as well as his carefully crafted prose and graceful literary style. Novelist Ōe Kenzaburō, who

Ōoka Tadasuke was a highly respected Japanese judge of the Tokugawa period (1603–1867). Appointed to office by Tokugawa Yoshimune (shogun 1716–45), Ōoka soon gained a reputation as one of the most able and incorruptible officials of the realm. As a reward, Yoshimune also appointed him the head of a

malaria: The course of the disease: …gametocytes produces embryonic forms called ookinetes; these embed themselves in the mosquito’s gut, where they mature after 9 to 14 days into oocysts, which in turn break open and release thousands of sporozoites that migrate to the insect’s salivary glands, ready to infect the next person in the cycle.

oölite, ovoid or spherical crystalline deposit with a concentric or radial structure; most are composed of calcium carbonate, but some are composed of silica, siderite, calcium phosphate, iron silicate, or iron oxide. Oölite diameters range from 0.25 to 2 mm (0.01 to 0.08 inch), with most being in

mineral deposit: Iron deposits: …of an iron mineral), these oolitic iron deposits have been largely supplanted in importance by BIFs, but they once formed the backbone of the iron and steel industries in western Europe and North America. European oolitic iron deposits, commonly called Minette-type deposits, contain ooliths of siderite, a siliceous iron mineral…

oolong, tea of Chinese origin, made from partially oxidized tea leaves. It therefore falls between a black tea (which is fully oxidized) and a green tea (which is barely oxidized). Known in China as oōlióng(dé), meaning “black dragon (tea),” oolong holds an intermediate position on the spectrum of