any of a group of colorless to green or yellow-green silicate minerals with the general chemical formula A2B3(SiO4)(Si2O7)O(OH), in which A is usually calcium (Ca), though manganese (Mn) or cerium ... [2 Related Articles]
(from the article "epidote") ...calcium (Ca), though manganese (Mn) or cerium (Ce) is sometimes substituted; and B is generally aluminum (Al), with the main substitution being ferric iron (Fe+3). Structurally the epidote group consists ...
one of the major divisions of the mineral-facies classification of metamorphic rocks, the rocks of which form under moderate temperature and pressure conditions (250°-400° C [500°-750° F] and up to ...
(from the article "therapeutics") ...These nerve blocks can provide relief in painful conditions like rib fractures, but they are most frequently used to anesthetize an extremity during hand or foot surgery. Spinal anesthesia and ...
(from the article "meninges") Within the vertebral canal the dura mater splits into two sheets separated by the epidural space, which is filled with veins. The outer of these two sheets constitutes the periosteum ...
(from the article "bivalve") Retention of the larval anchoring byssus into adult life has freed many bivalves from soft substrates, allowing them to colonize hard surfaces. This has also been achieved by cementation, as, ...
(from the article "ancient Greek civilization") Another way of institutionalizing relationships between the nationals of different states was epigamia, an arrangement by which the offspring of marriage were treated as citizens of the wife's polis if ...
(from the article "biology") ...schools of thought had been based on this question: the preformation school maintained that the egg contains a miniature individual that develops into the adult stage in the proper environment; ...
(from the article "loess") These pedogenetic processes may take place in three different ways. Epigenesis is an accumulation of a mineral mass without loess properties, perhaps with a high silt and lime content, which ...
the study of the chemical modification of specific genes or gene-associated proteins of an organism. Epigenetic modifications can define how the information in genes is expressed and used by cells. ... [1 Related Articles]
(from the article "angiosperm") In epigeous germination, the radicle emerges from the seed and the hypocotyl elongates, raising the cotyledons, epicotyl, and remains of the seed coat above ground. The cotyledons may then expand ...
(from the article "childhood disease and disorder") Croup is an inflammatory disease of the larynx (voice box) or epiglottis (the plate of cartilage that shuts off the entrance into the larynx during the process of swallowing), most ...
(from the article "croup") Bacterial croup, also called epiglottitis, is a more serious condition that is often caused by Haemophilus influenzae type B. It is characterized by marked swelling of the epiglottis, a flap ...
(from the article "religious dress") ...pallium than either the stole or the epitrachelion. In place of the phelonion, since the 16th century, the bishop uses a dalmatic known as the sakkos. The epigonation, or rhombus-shaped ...
(from the article "Seven Against Thebes") ...was swallowed up by the earth; Polyneices and Eteocles killed each other, fulfilling Oedipus's curse; and the others were killed by the guards at Thebes. When the sons of the ...
originally an inscription suitable for carving on a monument, but since the time of the Greek Anthology (q.v.) applied to any brief and pithy verse, particularly if astringent and purporting ... [7 Related Articles]
the study of written matter recorded on hard or durable material. The term is derived from the Classical Greek epigraphein ("to write upon, incise") and [8 Related Articles]
(from the article "angiosperm") ...is attached to the receptacle below the gynoecium and surrounds the ovary; the ovary is superior, and the free parts of the petals, sepals, and stamens are attached to the ...
(from the article "spider") The female genital structure, or epigynum, is a hardened plate on the underside of the abdomen in front of the gonopore. After the sperm are transferred into the epigynum, they ...
(from the article "horse") ...North America. During the remainder of the Eocene, the prime evolutionary changes were in dentition. Orohippus, a genus from the Middle Eocene, and Epihippus, ...
chronic neurological disorder characterized by sudden and recurrent seizures which are caused by excessive signaling of nerve cells in the brain. Seizures may include convulsions, momentary lapses of consciousness, strange ... [9 Related Articles]
(from the article "hydrosphere") Biological processes strongly affect the composition of lake waters and are responsible to a significant degree for the compositional differences between the upper water layer (the epilimnion) and the lower ...
genus of about 200 plants, in the evening primrose family (Onagraceae), native to most temperate regions. It includes fireweed (q.v.; species E. angustifolium), which rapidly covers newly burned areas. The ... [2 Related Articles]
(from the article "Epilobium") ...and purplish red or rose-red flower spikes. E. nummularifolium, from New Zealand, has whitish flowers and brownish red leaves; it is grown in rock gardens for its attractive matlike growth. ...
(from the article "Epilobium") ...western United States; it has rose-purple flowers. Two alpine species are E. alsinifolium and E. fleischeri, with almost needlelike leaves and purplish red or rose-red flower spikes. E. nummularifolium, from ...
(from the article "prologue and epilogue") prefatory and supplementary pieces to a literary work, especially a verse drama. The ancient Greek prologos was of wider significance than the modern prologue, effectually taking the place of an ...
(from the article "religious dress") ...the phelonion, with variant forms in the Greek and Russian churches. The sticharion, which is held by the zone, or girdle, corresponds to the alb. The cuffs, or epimanikia, which ...
(from the article "mollusk") ...or baler (Syrinx), up to 60 centimetres; among placophores the gumshoe, or gumboot chiton (Cryptochiton), achieves a length up to 30 to 43 centimetres; and, among solenogasters, Epimenia reaches a ...
Cretan seer, reputed author of religious and poetical writings, including a Theogony, Cretica, and other mystical works. Religious theories of an Orphic character were ...
(from the article "Pandora") ...out of earth, upon whom the gods bestowed their choicest gifts. In Hesiod's Works and Days, Pandora had a jar containing all manner of misery and evil. ...
(from the article "Moons of Saturn") Janus and Epimetheus are co-orbital moons-they share the same average orbit. Every few years they make a close approach, interacting gravitationally in such a way that one transmits angular momentum ...
(from the article "homomorphism") ...have their own names. A one-to-one homomorphism from G to H is called a monomorphism, and a homomorphism that is "onto," or covers every element of H, is called an ...
(from the article "meat processing") Skeletal muscles are divided from one another by a covering of connective tissue called the epimysium. As shown in Figure 1, individual muscles are divided into separate sections (called muscle ...
town, capital of the Vosges departement, Lorraine region, northeastern France, on the Moselle River, south-southeast of Nancy. The town, located on two arms of the Moselle, is divided into four ...
a distinguished figure in advanced literary circles in 18th-century France. Though she wrote a good deal herself, she is more famous for her friendships with three of the outstanding French ... [1 Related Articles]
town, northern suburb of Paris, Seine-Saint-Denis departement, Paris region, north-central France, on the Seine River. Epinay originated from a Gallic-Roman settlement called Spinogelum (Place of Thorns and ...
(from the article "grouper") any of numerous species of fishes of the family Serranidae (order Perciformes), many belonging to the genera Epinephelus and Mycteroperca. Groupers, widely distributed in warm seas, are characteristically large-mouthed, rather ...
two separate but related hormones secreted by the medulla of the adrenal glands. They are also produced at the ends of sympathetic nerve fibres, where they serve as chemical mediators ... [24 Related Articles]
lyric ode honouring a victor in one of the great Hellenic games. The epinicion was performed usually by a chorus, or on occasion by a solo singer, as part of ... [3 Related Articles]
(from the article "helleborine") any member of either of two similar genera of orchids (family Orchidaceae): Cephalanthera, with about 14 north-temperate species, and Epipactis, with about 21 species native to north-temperate areas, tropical Africa, ...
(from the article "India") ...the period in South Asia. At the other end of the subcontinent, in caves of the Hindu Kush in northern Afghanistan, evidence of occupation dating to between 15,000 and 10,000 ...
(from the article "Primary Diagnostic Horizons") ...concepts are necessary than the simple layer designations given above. One important concept is the epipedon, which is the uppermost horizon used to classify a soil within a designated area. ...
(from the article "marine ecosystem") ...the neritic province-resulting from dissolved materials in riverine runoff-distinguish this province from the oceanic. The upper portion of both the neritic and oceanic waters-the epipelagic zone-is where photosynthesis occurs; it ...
bishop noted in the history of the early Christian church for his struggle against beliefs he considered heretical. His chief target was the teachings of Origen, a major theologian in ... [3 Related Articles]
(from the article "Russian literature") ...correspondences. It appears in the most notable hagiography of the period, Zhitiye svyatogo Sergiya Radonezhskogo ("Life of Saint Sergius of Radonezh") by Epifany Premudry (Epiphanius the Wise; d. between 1418 ...
(from Greek epiphaneia, "manifestation"), festival celebrated on January 6; it is one of the three principal and oldest festival days of the Christian Church (including Easter and Christmas). It commemorates ... [5 Related Articles]
(from the article "Czechoslovak region, history of") ...for independence endorsed by the Allied governments. A demand for a sovereign state "within the historic frontiers of the Bohemian lands and of Slovakia" was made in Prague at the ...
(from the article "insect") ...In the primitive bloodsucking flies (e.g., the horsefly Tabanus) the mandibles and maxillae form serrated blades that cut through the skin and blood vessels of the host animal. The epipharynx ...
(from the article "Materialism") Another common relaxation of the paradigm is that which allows as compatible with Materialism such a theory as epiphenomenalism, according to which sensations and thoughts do exist in addition to ...
(from the article "cartilage") ...the skull are not preformed in cartilage. In the embryo, cartilage gradually calcifies, and chondrocytes are replaced by bone cells, or osteocytes. After birth a thin plate of cartilage, called ...
(from the article "bone disease") Epiphysiodesis (the fixing of the epiphysis to the bone shaft) is aimed at temporary or permanent cessation of growth in a metaphyseal cartilage. The operation is performed at the knee ...
expanded end of the long bones in animals, which ossifies separately from the bone shaft but becomes fixed to the shaft when full growth is attained. The epiphysis is made ... [2 Related Articles]
any plant that grows upon or is in some manner attached to another plant or object merely for physical support. Epiphytes are primarily tropical in distribution and are often known ... [7 Related Articles]
(from the article "plant disease") When the number of individuals a disease affects increases dramatically, it is said to have become epidemic (meaning "on or among people"). A more precise term when speaking of plants, ...
(from the article "crustacean") ...facing the trunk, is often rich with blood vessels and may in many groups be the only respiratory organ. Gills, when present, are formed by modifications of parts of appendages, ...
ancient fortified plateau west of Syracuse, Sicily, which was enclosed with walls some 12 miles (19 km) long by the tyrant Dionysius I (c. 430-367 BC). The southern wall, of ... [1 Related Articles]
(from the article "lepidopteran") ...cyanide in blood; larvae are leaf skeletonizers; related families: Aididae and Chalcosiidae (Old World tropics); Pyromorphidae and Dalceridae (New World).40 chiefly Asian species; larvae live as external ...
in ancient Greek Old Comedy, an address usually about public affairs. It was spoken by the leader of one-half of the chorus after that half of the chorus had sung ...
coastal region of northwestern Greece and southern Albania. It extends from Valona Bay (Gji i Vlores) in Albania (northwest) to the Gulf of Arta (southeast); its hinterland extends eastward to ... [3 Related Articles]
(from the article "Greece, history of") At the beginning of the 4th century the regions comprising very approximately the modern state of Greece were divided among eight provinces: Rhodope, Macedonia, Epirus Nova, Epirus Vetus, Thessaly, Achaea, ...
(from the article "Greece, history of") At the beginning of the 4th century the regions comprising very approximately the modern state of Greece were divided among eight provinces: Rhodope, Macedonia, Epirus Nova, Epirus Vetus, Thessaly, Achaea, ...
(1204-1337), Byzantine principality in the Balkans that was a centre of resistance for Byzantine Greeks during the western European occupation of Constantinople (1204-61). [1 Related Articles]
(from the article "scleritis") Episcleritis, in contrast to scleritis, is typically a benign, self-limited inflammation of the tissues immediately covering the sclera. It produces redness of the eye with or without mild tenderness. Only ...
in some Christian churches, the office of a bishop and the concomitant system of church government based on the three orders, or offices, of the ministry: bishops, priests, and deacons. ... [15 Related Articles]
autonomous church in the United States. Part of the Anglican Communion, it was formally organized in Philadelphia in 1789 as the successor to the Church of England in the American ... [15 Related Articles]
(from the article "mitre shell") ...Mollusca), in which the thick shell typically is bullet shaped, vaguely resembling a bishop's headdress, or mitre. Mitres are most common in the Indo-Pacific region. The 10-centimetre (4-inch) episcopal mitre ...
(from the article "Episcopal Church in Scotland") ...of Protestantism in Scotland went through confusing periods, with control alternating between the Presbyterian Party (those who believed in the presbyterian form of church government) and the Episcopal Party (those ...
in Christianity, a bishop without authority or without recognition in any major Christian church. Such bishops may have been properly consecrated but were not assigned to a diocese or were ...
(from the article "parturition") ...Deep lacerations require surgical reconstruction of the torn tissues. Extensive tears of the perineum (the tissues between the genital organs and the anus) can often be avoided by performing an ...
(from the article "ball") ...in a group, but there were also genuine team games and competitions among the ancient Greeks. Ball games were especially popular at Sparta. One early Greek game known as
in bacteria, one of a group of extrachromosomal genetic elements called plasmids, consisting of deoxyribonucleic acid (DNA) and capable of conferring a selective advantage upon the bacteria in which they ... [1 Related Articles]
(from the article "urogenital malformation") 5. Epispadias, an uncommon malformation of the male genital system in which the urethra opens on the upper surface of the penis. In hypospadias, often familial, the urethra opens on ...
(from the article "heredity") Examples of epistasis abound in nonhuman organisms. In mice, as in humans, the gene for albinism has two variants: the allele for nonalbino and the allele for albino. The latter ...
(from the article "Hellenistic Age") ...notably Antipater and Cassander. All were liable to impose conscription and taxation, though occasionally immunity was granted. The kings exercized control through a resident representative (epistates) in the cities, though ...
in genetics, a gene that determines whether or not a trait will be expressed. The system of genes that determines skin colour in man, for example, is independent of the ... [1 Related Articles]
(from the article "animal breeding") Additive and dominance variations are caused by genes at one locus. Epistatic variation is caused by the joint effects of genes at two or more loci. There has been little ...
(from the article "applied logic") Epistemic logic deals with the logical issues arising within the gamut of such epistemological concepts as knowledge, belief, assertion, doubt, question-and-answer, or the like. Instead of dealing with the essentially ...
(from the article "Christianity") ...to doubt it. Accordingly, one who has the experience of living in the presence of God can properly proceed in both thought and life on the basis that God is ...
(from the article "mathematics, philosophy of") The epistemological argument is very simple. It is based on the idea that, according to Platonism, mathematical knowledge is knowledge of abstract objects, but there does not seem to be ...
(from the article "Rorty, Richard") ...epistemology he opposed foundationalism, the view that all knowledge can be grounded, or justified, in a set of basic statements that do not themselves require justification. According to his "epistemological ...
(from the article "Rationalism") The first Western philosopher to stress rationalist insight was Pythagoras, a shadowy figure of the 6th century BC. Noticing that, for a right triangle, a square built on its hypotenuse ...
the study of the nature, origin, and limits of human knowledge. The term is derived from the Greek episteme ("knowledge") and logos ("reason"), and ... [41 Related Articles]
hydrated sodium and calcium aluminosilicate mineral in the zeolite family. It forms piezoelectric crystals of monoclinic symmetry and platy habit; the latter property has caused epistilbite to be assigned to ... [1 Related Articles]
a novel told through the medium of letters written by one or more of the characters. Originating with Samuel Richardson's Pamela; or, Virtue Rewarded (1740), the story of a servant ... [4 Related Articles]
(from the article "Egypt, ancient") ...into the prefect's office. But the prefect was assisted by a hierarchy of subordinate equestrian officials with expertise in particular areas. There were three or four epistrategoi ...
(from the article "biblical literature") Among the apocryphal letters are: a 2nd-century Epistula Apostolorum ("Epistle of the Apostles"; actually apocalyptic and antiheretical), the Letter of Barnabas, a lost Letter of Paul to the Alexandrians (said ...
an inscription in verse or prose upon a tomb; and, by extension, anything written as if to be inscribed on a tomb. Probably the earliest surviving are those of the ... [1 Related Articles]
(from the article "panegyric") Akin to panegyric was the epitaphion, or funeral oration, such as Pericles' funeral speech as recorded by Thucydides, a panegyric both on war heroes and on Athens itself.
(from the article "materials science") For the efficient emission or detection of photons, it is often necessary to constrain these processes to very thin semiconductor layers. These thin layers, grown atop bulk semiconductor wafers, are ...
the process of growing a crystal of a particular orientation on top of another crystal, where the orientation is determined by the underlying crystal. The creation of various layers in ... [3 Related Articles]
song or poem to the bride and bridegroom at their wedding. In ancient Greece, the singing of such songs was a traditional way of invoking good fortune on the marriage ...
(from the article "nervous system, human") The epithalamus is represented mainly by the pineal gland, which lies in the midline posterior and dorsal to the third ventricle. This gland synthesizes melatonin and enzymes sensitive to daylight. ...
(from the article "stem cell") The epidermis of the skin contains layers of cells called keratinocytes. Only the basal layer, next to the dermis, contains cells that divide. A number of these cells are stem ...
(from the article "artiodactyl") ...mammal within its mother breathes, feeds, and excretes through an organ called the placenta, which is connected with the tissues of the mother's uterus (womb) wall. Hippopotamuses and pigs have ...
an abnormal growth, or tumour, of the epithelium, the layer of tissue (such as the skin or mucous membrane) that covers the surfaces of organs and other structures of the ...
in anatomy, layer of cells closely bound to one another to form continuous sheets covering surfaces that may come into contact with foreign substances. Epithelium occurs in both plants and ... [14 Related Articles]
(from the article "mineral deposit") Hydrothermal deposits formed at shallow depths below a boiling hot spring system (see figure) are commonly referred to as epithermal, a term retained from an old system of classifying hydrothermal ...
