photoreception: Optics of superposition eyes: …the tropical mysid shrimp genus Dioptromysis, which has a normal-looking eye that contains a single enormous facet embedded in the back, with an equally large lens cylinder behind the facet. This single optical element supplies a fine-grain retina, which seems to act as the “fovea” of the eye as a…

Judy Chicago: She also collaborated with Christian Dior to design the set for the fashion house’s spring 2020 haute couture show in Paris and on a series of bags released later that same year. In 2021 the de Young Museum, San Francisco, put on an exhibition of Chicago’s work, billed as…

Senegal: Soils: These soils, called Dior soils, constitute the wealth of Senegal; the dunes they form are highly favourable to peanut cultivation, whereas the soils between the dunes are suitable for other food crops, such as sorghum. In the southwest the plateau soils are sandy clays, frequently laterized (leached into…

Christian Dior was a French fashion designer whose New Look style—characterized by ultrafeminine and highly sculptured clothing—dominated fashion in the decade following World War II. His eponymous fashion house is one of the most iconic in the world. Dior was one of five children born to

diorama, three-dimensional exhibit, often miniature in scale, frequently housed in a cubicle and viewed through an aperture. It usually consists of a flat or curved back cloth on which a scenic painting or photograph is mounted. Flat or solid objects are placed in front of the back cloth, and

Hiroshi Sugimoto: …his first body of work, Dioramas. Photographing exhibits inside natural history museums, Sugimoto’s images brought to life extinct creatures and prehistoric situations. The photographs took on a sense of authenticity that the museum dioramas themselves did not possess. In his next series, Theaters, begun in 1978, he photographed movie theatres…

Hamani Diori was a nationalist politician and the first president (1960–74) of independent Niger. A teacher after 1936, Diori entered politics full-time following World War II and in 1946 became one of the founders of the Progressive Party of Niger, an affiliate of the African Democratic Rally, a

diorite, medium- to coarse-grained intrusive igneous rock that commonly is composed of about two-thirds plagioclase feldspar and one-third dark-coloured minerals, such as hornblende or biotite. The presence of sodium-rich feldspar, oligoclase or andesine, in contrast to calcium-rich plagioclase,

steroid: Sapogenins and saponins: Among these is dioscin (25)—from certain yams, genus Dioscorea; the steroid portion of this saponin is diosgenin.

yam, any of several plant species of the genus Dioscorea (family Dioscoreaceae) grown for their edible tubers. Yams are native to warmer regions of both hemispheres, and several species are cultivated as staple food crops in the tropics. In certain tropical cultures, notably in West Africa and New

yam: Major species: trifida) and winged, or water, yam (D. alata) are the edible species most widely diffused in tropical and subtropical countries. The tubers of D. alata sometimes weigh 45 kg (100 pounds). Guinea yam (D. rotundata) and yellow Guinea yam (D. cayenensis) are the main yam species grown…

yam: Major species: Chinese yam (D. polystachya), also known as cinnamon vine, is widely cultivated in East Asia.

Dioscoreaceae: batatas); air potato (D. bulbifera); and yampee, or cush-cush (D. trifida).

yam: Major species: rotundata) and yellow Guinea yam (D. cayenensis) are the main yam species grown in West Africa. Lesser yam (D. esculenta), grown on the subcontinent of India, in southern Vietnam, and on South Pacific islands, is one of the tastiest yams. Chinese yam (D. polystachya), also known as…

elephant’s-foot, (Dioscorea elephantipes), odd-looking twining plant of the yam family, characterized by a large, woody, and partially exposed tuber. It is native to semiarid areas in South Africa and has served as a food for local peoples during famine. The plant is grown in desert gardens and

yam: Major species: Lesser yam (D. esculenta), grown on the subcontinent of India, in southern Vietnam, and on South Pacific islands, is one of the tastiest yams. Chinese yam (D. polystachya), also known as cinnamon vine, is widely cultivated in East Asia.

yam: Major species: Chinese yam (D. polystachya), also known as cinnamon vine, is widely cultivated in East Asia.

yam: Major species: Guinea yam (D. rotundata) and yellow Guinea yam (D. cayenensis) are the main yam species grown in West Africa. Lesser yam (D. esculenta), grown on the subcontinent of India, in southern Vietnam, and on South Pacific islands, is one of the tastiest yams. Chinese yam…

Dioscoreaceae: bulbifera); and yampee, or cush-cush (D. trifida).

Dioscoreaceae, the yam family of the flowering plant order Dioscoreales, consisting of 4 genera and 870 species of herbaceous or woody vines and shrubs, distributed throughout tropical and warm temperate regions. Members of the family have thick, sometimes woody roots or tuber-like underground

Dioscoreales, the yam order of flowering plants, belonging to the monocotyledons (characterized by a single seed leaf) and containing three families, about 22 genera, and more than 1,000 species. Under the Angiosperm Phylogeny Group (APG) botanical classification system, the order contained five

Pedanius Dioscorides was a Greek physician and pharmacologist whose work De materia medica was the foremost classical source of modern botanical terminology and the leading pharmacological text for 16 centuries. Dioscorides’ travels as a surgeon with the armies of the Roman emperor Nero provided

herbal: … of the Greek physician Pedacius Dioscorides. A Byzantine version of his famous herbal is the Constantinopolitan, or Viennese, Codex (c. ad 512). Some of its illustrations are probably derived from Crateuas, together with plant names, such as Anemone and Anagallis, which are still in use. Many manuscript herbals, drawing largely…

Dioscorus was a pope, or antipope, for 23 days in 530. A deacon in the Alexandrian Church, he clashed with the Miaphysites (Christians teaching that Christ has one nature, rather than two—i.e., human and divine) and went to Rome. Under Pope Symmachus he was papal legate at Ravenna to the

Dioscorus was a Christian patriarch of Alexandria and eastern prelate who was deposed and excommunicated by the Council of Chalcedon in 451. Dioscorus was archdeacon at Alexandria when he succeeded St. Cyril as patriarch in 444. He upheld his predecessor’s miaphysitism, or the Christological

calligraphy: Byzantine period: …in an acrostic poem by Dioscorus of Aphrodito; it bears a clear relationship to the Menander Dyskolos hand, which was probably written in the later 3rd century ce. Similar pairs could be found to illustrate the continuity in transformation of the biblical uncial and Coptic styles. The latest Greek papyrus…

Dioscuri, (Dioscuri from Greek Dioskouroi, “Sons of Zeus”), in Greek and Roman mythology, twin deities who succoured shipwrecked sailors and received sacrifices for favourable winds. They were the children of Leda and either Zeus, the king of the gods, or Tyndareus, Leda’s mortal husband and the

Spanish literature: Theatre: …decades of the 20th century, Ana Diosdado, gained national recognition with Olvida los tambores (1970; “Forget the Drums”). Other woman dramatists are Paloma Pedrero, Pilar Enciso, Lidia Falcón, Maribel Lázaro, Carmen Resino, and María Manuela Reina.

sapogenin: …of converting the steroid sapogenin diosgenin into progesterone have been developed. An abundant source of diosgenin is a Mexican yam called cabeza de negro, and progesterone made from it is used in producing steroid hormones.

Miskolc: …small iron field and with Diósgyőr, farther up the Szinva River valley, which in the 14th and 15th centuries was a regular retreat for royalty; its splendid castle is now largely in ruins. The long-established wealth and importance of Miskolc are apparent in some fine old buildings, including St. Stephen’s,…

Lod, city, central Israel, on the Plain of Sharon southeast of Tel Aviv–Yafo. Of ancient origin, it is mentioned several times in the Bible: in a New Testament account (Acts 9:32), the apostle Peter healed the paralytic at Lod. The city was a well-known center of Jewish scholars and merchants from

Diospyros, genus of some 500 species of trees and shrubs of the family Ebenaceae, most of which are native to the tropics. Some members of the genus are valuable for their timber, particularly several species of ebony. Others are cultivated for their handsome foliage or edible fruit. Members of the

Diospyros: Major species: nigra), and the mabolo (D. blancoi), the last being cultivated for its tasty fruit, which is dark red to purple.

ebony: Native to Angola, D. dendo is a valuable timber tree with very black and hard heartwood known as black ebony, as billetwood, or as Gabon, Lagos, Calabar, or Niger ebony.

ebony: …Ceylon ebony is produced by Diospyros ebenum, which grows in abundance throughout the flat country west of Trincomalee in Sri Lanka. The tree is distinguished by the width of its trunk and its jet-black charred-looking bark, beneath which the wood is pure white until the heart is reached. The heartwood…

persimmon: The Japanese persimmon (Diospyros kaki), an important and extensively grown fruit in China and Japan, where it is known as kaki, was introduced into France and other Mediterranean countries in the 19th century and grown to a limited extent there. Introduced into the United States a…

ebony: …ebony is yielded by the Coromandel ebony (D. melanoxylon), a large tree attaining a height of 18–24 metres (59–79 feet) and a circumference of 2.4–3 metres (about 8–10 feet) and having irregular branches and oblong leaves.

ebony: Bombay ebony (D. montana) yields a yellowish gray, soft, but durable wood. It is native to India.

sapote: Black sapote (Diospyros nigra), also known as chocolate pudding fruit, is a member of the family Ebenaceae and is found throughout the Caribbean and Central America. White sapote, or casimiroa (Casimiroa edulis), ranges from Mexico to Costa Rica and is in the Rutaceae family.

ebony: The calamander tree (D. quaesita) produces an ebony wood known in Sri Lanka as calamander. Its closeness of grain, great hardness, and fine hazel-brown colour, mottled and striped with black, render it valuable for veneering and furniture making.

Diospyros: Major species: …species are the common, or American, persimmon (Diospyros virginiana), native to North America, and the Japanese, or kaki, persimmon (D. kaki), native to China but widely cultivated in other temperate regions. The globular orange fruit of the common persimmon is about 4 cm (1.5 inches) in diameter. The tree grows…

Vilmos Diószegi was a Hungarian folklorist, linguist, ethnographer, Orientalist, and editor of the first Manchu-Tungus dictionary. His research focused on the religious beliefs of the Siberian peoples and of the ancient Hungarians (Magyars) before they migrated to the middle basin of the Danube

Vilmos Diószegi was a Hungarian folklorist, linguist, ethnographer, Orientalist, and editor of the first Manchu-Tungus dictionary. His research focused on the religious beliefs of the Siberian peoples and of the ancient Hungarians (Magyars) before they migrated to the middle basin of the Danube

mollusk: Annotated classification: …at visceral loop; orders include Archaeogastropoda (long cerebropleural connectives) and Apogastropoda (bifurcate tentacle nerves, 2 pedal commissures); at least 20,000 species. Subclass Opisthobranchia (Euthyneura) (bubble shells, sea hares, nudibranchs, and snails) Marine, limnic, or terrestrial snails and slugs without operculum; visceral loop with

Abdou Diouf is a politician who was president of Senegal from 1981 to 2000. Diouf, the son of a postman, was a member of the Serer people and a devout Muslim. He attended the well-known Lycée Faidherbe in Saint-Louis, then capital of Senegal, and the University of Dakar. In 1958 he went to Paris

El Hadji Diouf is a Senegalese football (soccer) player who was named African Football Confederation (Confédération Africaine de Football; CAF) Player of the Year for 2001 and 2002. He was a fiery, controversial figure off the field and established himself as either an out-and-out striker or a

El Hadji Diouf is a Senegalese football (soccer) player who was named African Football Confederation (Confédération Africaine de Football; CAF) Player of the Year for 2001 and 2002. He was a fiery, controversial figure off the field and established himself as either an out-and-out striker or a

Cavalla River, river in western Africa, rising north of the Nimba Range in Guinea and flowing south to form more than half of the Liberia–Côte d’Ivoire border. It enters the Gulf of Guinea 13 miles (21 km) east of Harper, Liberia, after a course of 320 miles (515 km). With its major tributaries

Dyula, people of western Africa who speak a Mande language of the Niger-Congo language family. Most are Muslims, and they have long been noted as commercial traders. The Dyula were active gold traders as long ago as the time of the ancient African kingdom of Ghana. They flourished under the empire

Diourbel, town, western Senegal, about 90 miles (145 km) east of Dakar. As a market for a peanut- (groundnut-) growing area, Diourbel produces peanut oil as well as beverages and perfume. The town is the site of a beautiful mosque and is a popular stop for Mourides (Murīdiyyah) Muslims making a

dioxin, any of a group of aromatic hydrocarbon compounds known to be environmental pollutants that are generated as undesirable by-products in the manufacture of herbicides, disinfectants, and other agents. In popular terminology, dioxin has become a synonym for one specific dioxin,

mining: Underground mining: The orientation, specifically the dip, of the ore body is particularly important in method selection. If the dip is greater than about 50°, then systems using gravity to move the ore can be considered. If the dip is less than about 25°, then systems using rubber-tired equipment for ore…

geomagnetic field: Representation of the field: The dip angle, I (for inclination), is the angle that the total field vector makes with respect to the horizontal plane and is positive for vectors below the plane. It is the complement of the usual polar angle of spherical coordinates. (Geographic and magnetic north coincide…

geomagnetic field: Representation of the field: The dip angle, I (for inclination), is the angle that the total field vector makes with respect to the horizontal plane and is positive for vectors below the plane. It is the complement of the usual polar angle of spherical coordinates. (Geographic and magnetic north coincide…

dip circle, instrument for measuring the inclination, or dip, of the Earth’s magnetic field. It consists essentially of a magnetic needle pivoted at the centre of a graduated circle. The assembly is mounted such that the needle swings vertically rather than horizontally, as does a compass needle.

dip circle, instrument for measuring the inclination, or dip, of the Earth’s magnetic field. It consists essentially of a magnetic needle pivoted at the centre of a graduated circle. The assembly is mounted such that the needle swings vertically rather than horizontally, as does a compass needle.

dip circle, instrument for measuring the inclination, or dip, of the Earth’s magnetic field. It consists essentially of a magnetic needle pivoted at the centre of a graduated circle. The assembly is mounted such that the needle swings vertically rather than horizontally, as does a compass needle.

dip pole, any point on the Earth’s surface where the dip (magnetic inclination; i.e., the angle between the Earth’s surface and the total magnetic field vector) of the Earth’s magnetic field is 90 degrees—that is, perpendicular to the surface. There are two main dip poles, one on the Antarctic

Sikhism: The 18th and 19th centuries: …the Harmandir Sahib in 1757, Dip Singh, a member of the Shahid misl, pledged to free the shrine or die in the attempt. His small army was met by a much larger one several kilometers from Amritsar, and in the ensuing battle Dip Singh’s head was cut off. According to…

valley: Drainage patterns: …of the cuesta are called dip streams because they parallel the structural dip of the strata. Streams draining the cuesta scarp into longitudinal valleys flowing opposite to the structural dip are called antidip streams.

geomagnetic field: Representation of the field: The dip angle, I (for inclination), is the angle that the total field vector makes with respect to the horizontal plane and is positive for vectors below the plane. It is the complement of the usual polar angle of spherical coordinates. (Geographic and magnetic north coincide…

fault: Normal dip-slip faults are produced by vertical compression as Earth’s crust lengthens. The hanging wall slides down relative to the footwall. Normal faults are common; they bound many of the mountain ranges of the world and many of the rift valleys found along spreading margins…

Atīśa was an Indian Buddhist reformer whose teachings formed the basis of the Tibetan Bka’-gdams-pa (“Those Bound by Command”) sect of Buddhism, founded by his disciple ’Brom-ston. Traveling to Tibet in 1038 or 1042 from Nālandā, a centre of Buddhist studies in India, Atīśa established monasteries

Diwali, one of the major religious festivals in Hinduism, Jainism, and Sikhism, lasting for five days from the 13th day of the dark half of the lunar month Ashvina to the second day of the light half of the lunar month Karttika. (The corresponding dates in the Gregorian calendar usually fall in

Dīpavaṃsa, (Pāli: “History of the Island”), oldest extant historical record of Sri Lanka, compiled in the 4th century. It is considered to be one of the main sources drawn upon by the author of the later and more comprehensive historical chronicle the Mahāvaṃsa. In its emphasis on ecclesiastical

Gyanendra: …subsequent suicide of Crown Prince Dipendra, who had committed the murder.

diphenhydramine, synthetic drug used in the treatment of various conditions including hay fever, acute skin reactions (such as hives), contact dermatitis (such as from poison ivy), and motion sickness. Diphenhydramine counteracts the histamine reaction. Introduced into medicine in 1945 and marketed

antidiarrheal drug: The opiate derivative diphenoxylate typically is given with atropine in a combination marketed as Lomotil. Although opioids carry a risk of dependency and addiction, codeine and the synthetic analogs diphenoxylate and loperamide produce little dependence, and they have been used successfully for diarrhea.

biphenyl, an aromatic hydrocarbon, used alone or with diphenyl ether as a heat-transfer fluid; chemical formula, C6H5C6H5. It may be isolated from coal tar; in the United States, it is manufactured on a large scale by the thermal dehydrogenation of benzene. Biphenyl is slightly less reactive

chemical indicator: 08 volts; and diphenylcarbazone, an indicator for mercuric ion, changes from yellow to violet when the mercuric ion concentration is increased from 0.000001 to 0.00001 mole per litre. Each of these indicators thus has a relatively narrow transition range, and each is capable of giving a sensitive, sharp…

radical: Stable radicals.: An example is diphenylnitrogen oxide, (C6H5)2NO, which is obtained by the oxidation of diphenylhydroxylamine, (C6H5)2NOH.

Diphilus was a major poet of Greek New Comedy and a significant influence on the Roman playwrights Plautus and Terence. Diphilus lived most of his life in Athens, and his death was commemorated there with a funerary epitaph. He is believed to have written more than 100 comedies, of which 137

diphosgene, in chemical warfare, poison gas widely used by Germany during World War I. Its chemical name is trichloromethyl chloroformate, and it is a colourless, moderately persistent, poisonous, organic compound, the odour of which is likened to that of newly mown hay. It is easily condensable to

Arthur Kornberg: …flavine adenine dinucleotide (FAD) and diphosphopyridine nucleotide (DPN), coenzymes that are important hydrogen-carrying intermediaries in biological oxidations and reductions.

nitrile: …formed by heating amides with phosphorous pentoxide. They can be reduced to primary amines through the action of lithium aluminum hydride or hydrolyzed to carboxylic acids in the presence of either an acid or a base.

furniture: Greece: The diphros was a stool standing on four crossed, turned legs, sometimes connected by stretcher bars and sometimes terminating in hoofs or claw feet. The convenience of folding stools was realized at an early date, and the diphros was popular.

diphtheria, acute infectious disease caused by the bacillus Corynebacterium diphtheriae and characterized by a primary lesion, usually in the upper respiratory tract, and more generalized symptoms resulting from the spread of the bacterial toxin throughout the body. Diphtheria was a serious

infectious disease: Antitoxins: Diphtheria antitoxin of animal origin remains the principal treatment, along with antibiotics.

diphtheria: The diphtheria toxoid is usually first given in several successive doses during the first few months of life, with booster doses within one or two years and again at five or six years of age.

laryngitis: Diphtheritic laryngitis is caused by the spread of diphtheria from the region of the upper throat down to the larynx. It may cause a membrane of white blood cells, fibrin (blood clotting protein), and diseased skin cells to attach to and infiltrate the surface mucous…

yellow-eyed penguin: Conservation status: …changes in seawater temperature and diphtheritic stomatitis (a disease caused by bacteria that produces mouth lesions in chicks that hinder swallowing and respiration). In addition, the species is limited to small habitat patches, many of which have declined in quality as a result of residential development and other human activities.…

diphthong, in phonetics, a gliding vowel in the articulation of which there is a continuous transition from one position to another. Diphthongs are to be contrasted in this respect with so-called pure vowels—i.e., unchanging, or steady state, vowels. Though they are single speech sounds, diphthongs

phylogeny: Animal evolution: The alternative diphyletic theory has been proposed by many zoologists. It contends that the higher metazoans had two lines of descent; one led to annelids, arthropods, and mollusks, and the other led to echinoderms and chordates. Both groups emanated from an ancient flatworm.

vampire bat: …or Desmodus, youngi) and the hairy-legged vampire bat (Diphylla ecaudata) are the only sanguivorous (blood-eating) bats. The common vampire bat thrives in agricultural areas and feeds on livestock such as cattle, pigs, and chickens. The other two vampires are primarily restricted to intact forests, where they feed on birds, reptiles,…

flatworm: Annotated classification: Order Diphyllidea Two bothridia, each sometimes bisected by a median longitudinal ridge; large rostellum (cone-shaped or cylindrical projection) armed with dorsal and ventral groups of large hooks; cephalic peduncle (fleshy stalk on head) with longitudinal rows of T-shaped hooks; genital pore median, parasitic in elasmobranchs; 1…

digestive system disease: Tapeworms: Diphyllobothrium latum, a fish tapeworm, may cause a severe anemia similar to pernicious anemia, because it consumes most of the vitamin B12 in the diet of the host.

bird-of-paradise: The magnificent bird-of-paradise (Diphyllodes magnificus) and Wilson’s bird-of-paradise (D. respublica) are caped and have two wirelike tail feathers curving outward; in Wilson’s the crown is bare and has a “cross of Christ” pattern. The king bird-of-paradise (Cicinnurus regius), only 13 to 17 cm long, has similar…

bird-of-paradise: magnificent bird-of-paradise (Diphyllodes magnificus) and Wilson’s bird-of-paradise (D. respublica) are caped and have two wirelike tail feathers curving outward; in Wilson’s the crown is bare and has a “cross of Christ” pattern. The king bird-of-paradise (Cicinnurus regius), only 13 to 17 cm long, has similar but flag-tipped tailwires and fanlike…

sound: Binaural perception: …between the two ears, called diplacusis, is generally not a problem. A type of beating known as binaural beats can sometimes be observed when the two tones are presented binaurally.

fern: Annotated classification: Family Diplaziopsidaceae Plants medium to large in soil or on rocks; rhizomes short- to long-creeping or erect, scaly; leaves pinnately divided, glabrous, hairy, glandular, or occasionally scaly; sori round or elongate along the veins; sporangia with the annulus vertical; spores monolete (more or less bean-shaped); 2…

cerebral palsy: …or on both sides (diplegia). In spastic diplegia, spastic contractions and paralysis are usually more prominent in the lower extremities than in the arms and hands (Little diplegia), or only the legs may be affected (paraplegia). The cerebral damage causing spastic cerebral palsy primarily affects the neurons and connections…

echinoderm: Development: …basic larval type called a dipleurula larva, characterized by bilateral symmetry; hence the name, which means “little two sides.” A single band of hairlike projections, or cilia, is found on each side of the body and in front of the mouth and anus. The characteristic larvae found among the living…

circulatory system: General features of circulation: …anemones, jellyfish, and corals—has a diploblastic level of organization (i.e., its members have two layers of cells). The outer layer, called the ectoderm, and the inner layer, called the endoderm, are separated by an amorphous, acellular layer called the mesoglea; for these animals, bathing both cellular surfaces with environmental fluid…

black spot: …disease caused by the fungus Diplocarpon rosae. On rose plants, the spots are roundish and up to 1 cm (0.5 inch) in diameter with fringed margins. Leaves on susceptible varieties turn yellow and drop early. Affected plants may defoliate twice in a season, are greatly weakened, produce fewer and inferior…

scorpion: Annotated classification: Family Diplocentridae 85 species found in warm regions of the Middle East, Mexico southward to northern South America, and the Antilles islands. Tubercular spine under stinger. Family Euscorpiidae 56 species absent from Australia and most of Africa. Family Liochelidae

scorpion: Annotated classification: Family Diplocentridae 85 species found in warm regions of the Middle East, Mexico southward to northern South America, and the Antilles islands. Tubercular spine under stinger. Family Euscorpiidae 56 species absent from Australia and most of Africa. Family Liochelidae

bioluminescence: The range and variety of bioluminescent organisms: …Diplocladon hasseltii, called starworm, or diamond worm, gives off a continuous greenish blue luminescence from three spots on each segment of the body, forming three longitudinal rows of light, the appearance of which inspired the common name night train. Phrixothrix, the railroad worm, possesses two longitudinal rows, with a red…

coccus: Pairs of cocci are called diplococci; rows or chains of such cells are called streptococci; grapelike clusters of cells, staphylococci; packets of eight or more cells, sarcinae; and groups of four cells in a square arrangement, tetrads. These characteristic groupings occur as a result of variations in the reproduction process…

coccus: Pairs of cocci are called diplococci; rows or chains of such cells are called streptococci; grapelike clusters of cells, staphylococci; packets of eight or more cells, sarcinae; and groups of four cells in a square arrangement, tetrads. These characteristic groupings occur as a result of variations in the reproduction process…

pneumococcus, (Streptococcus pneumoniae), spheroidal bacterium in the family Streptococcaceae that is responsible for various illnesses in humans, including pneumonia, sinusitis, otitis media, and meningitis. It is microbiologically characterized as a gram-positive coccus, 0.5 to 1.25 μm