Arabic Script
ARABIC SCRIPT
Used to represent the Arabic language, as well as certain non-Arabic and non-Semitic languages.
The Arabic script is an alphabet in which each written symbol represents a single sound. It is Semitic and, thus, a near relative of the Hebrew alphabet but also historically related to the Roman alphabet. The Arabic alphabet is second only to the Roman in use today. It is used by over 185 million first-language speakers of Arabic. As the medium in which the Qurʾan was revealed and much Islamic learning was recorded, Arabic is a second or liturgical language for Muslims worldwide. In addition, the Arabic alphabet has been adapted for use in other non-Arabic and non-Semitic languages, among them Persian, Urdu, and Ottoman Turkish.
The Arabic script is written from right to left. It is cursive, so that each letter in a word is joined to the following letter (exceptions to this rule are the letters alif, da-l, dha-l, ra-, za-y, and wa-w ). The alphabet is consonantal, consisting of twenty-eight consonants and semivowels. Other signs or diacritical marks indicate short vowels and other sound changes, but these do not typically appear in written texts. In theory, at least, the lack of written vowels causes a certain ambiguity when it comes to deciphering the written word. To take one example, the word ktb can be read in several ways: kataba, "he
wrote"; kutiba, "it was written"; kattaba, "he dictated"; kuttiba, "he was made to take dictation"; ktab, "[the act of] writing"; kutub, "books." In practice, however, context plays a considerable role in clarifying meaning. In a sentence such as "he wrote five ktb on this topic, ktb could only mean "books." Where lack of ambiguity is necessary or desirable, as in the written text of the Qurʾan, in classical Islamic or literary texts, and in writings for children, the diacritical marks are written as a matter of course.
The Arabic alphabet is not simply a vehicle for written communication but is the medium for one of the most highly developed art forms of the Arab and Islamic world, the art of calligraphy. For the Arabic language, calligraphy recognizes two principal types of Arabic script, kufi and naskhi, where the former is generally more square in shape and the latter more rounded. This binary division, however, hardly reflects the tremendous diversity of scripts, from the tiny Turkish ghubari, or "dust," script, to the large jali scripts that decorate the walls of certain mosques, from the severely "squared" kufi, with right angles rather than curves, to the elaborate "tied" scripts, in which the capitals are linked to form knotted arabesques.
In the Arab world and elsewhere, Arabic script is a powerful symbol of ethnic and religious affiliation. Its significance does not make it inviolable, however. The Arabic alphabet was replaced by the Roman alphabet in Turkey in 1928 and by the Cyrillic alphabet in a number of republics in the former Soviet Central Asia, to name two examples. Proposals to Romanize the Arabic alphabet in the Arab world have been advanced since the late nineteenth century. To date, however, only in Malta, which was conquered by the Sicilians in the eleventh century, is any variety of Arabic regularly written in other than the Arabic script.
Elizabeth M. Bergman
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Reports from University of Sydney add new data to research in biology.
Newspaper article from: Science Letter; 5/19/2009; 700+ words
; ...has formed into two lateral coeloms and an anterior coelom. The primary podia form from...and hydropore. The anterior coelom forms the coelom of the brachia," wrote V...described and extended to coeloms of other deuterostome phyla...
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Reports outline developmental science study findings from Indiana University.(Report)
Newspaper article from: Health & Medicine Week; 2/16/2009; 700+ words
; ...the timing of the formation of the left coelom and initiation of adult development...responsible for the development of the left coelom and adult structures are associated with...erythrogramma. We present evidence that left coelom formation in H. erythrogramma, which...
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Waveform dynamics of spermatozeugmata during the transfer from paternal to maternal individuals of Membranipora membranacea.
Magazine article from: The Biological Bulletin; 2/1/2004; ; 700+ words
; ...membranacea migrate into the perivisceral coelom from the peritoneum of the body wall...membranacea are motile in the paternal coelom, like sperm of other gymnolaemate bryozoans...become positioned in the perivisceral coelom between the body wall and the distomedial...
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Coelomic cavities may function as a vascular system in amphioxus larvae.
Magazine article from: The Biological Bulletin; 12/1/1998; ; 700+ words
; ...FOR FIGURE 1A OMITTED] that the ventral coelom, a longitudinally extensive cavity...FOR FIGURE 1A OMITTED]. The ventral coelom is lined by a sheet of very narrow epithelial...blood vessel, but rather the ventral coelom. The occurrence of peristaltic contractions...
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Gamete spawning and fertilization in the gymnolaemate bryozoan Membranipora membranacea.
Magazine article from: The Biological Bulletin; 10/1/1994; ; 700+ words
; ...for oocytes from the maternal visceral coelom to the external seawater. For E. posidoniae...crustulenta is external to the maternal coelom, occurring while oocytes are in either...Membranipora membranacea is within the maternal coelom, whereas the site of egg activation is...
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Off to the (earthworm) races: A quick & flexible lab experiment for introductory zoology courses
Magazine article from: The American Biology Teacher; 10/1/2001; ; 700+ words
; ...a fluid-filled body cavity (the coelom), segments (metamers), a nervous...setae). With segments partitioning the coelom and segmental ganglia lending local...have no "anchors," and possess a coelom but only longitudinal muscles. Bivalves...
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Evidence for sequential hermaphroditism in Sabellastarte spectabilis (polychaeta: sabellidae) in Hawai'i (1).
Magazine article from: Pacific Science; 10/1/2006; ; 700+ words
; ...on histologically prepared slides. Most individuals sampled had only one type of gamete in the coelom, but both eggs and sperm were seen in the coelom of 15% of individuals, demonstrating the occurrence of hermaphroditism in Hawaiian populations...
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Autofluorescence in eleocytes of some earthworm species
Magazine article from: Folia Histochemica et Cytobiologica; 1/1/2006; ; 700+ words
; ...encapsulation of invading bacteria and particulate waste products. The coelom communicates with the outer environment directly by dorsal pores...Perhaps amoebocytes derive from the mesenchymal lining of the coelom [9] while ele-ocytes originate by the detachment of chloragogen...
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SECOND-TRIMESTER DIAGNOSIS OF LIMB-BODY WALL COMPLEX WITH LITERATURE REVIEW OF PATHOGENESIS
Magazine article from: Genetic Counseling; 1/1/2007; ; 700+ words
; ...oligohydramnios, renal defects, persistence of the extraembryonic coelom and oligohydramnios. Among them, 4 had left lower limb anomaly...defects, amniotic bands and lack of persistence of extraembryonic coelom. All pregnancies were terminated. Table I summarizes the perinatal...
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Madreporite function and fluid volume relationships in sea urchins.
Magazine article from: The Biological Bulletin; 12/1/1996; ; 700+ words
; ...diverted from the water vascular system to the perivisceral coelom, thus maintaining the fluid volume of the flexible body...displacement of their associated ampullae into the perivisceral coelom would not impart too much pressure on the peristome
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coelom
Book article from: The Columbia Encyclopedia, Sixth Edition
coelom , fluid-filled body cavity, found in...and an inner layer, the endoderm . The coelom then forms as a result of the splitting...and the spaces within these folds form the coelom. The structure of the embryonic coelom...
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Body Cavities
Book article from: Animal Sciences
...secondary body cavity, or coelom, and consequently these...characteristics of true coeloms. Finally, several animal...cavity known as a true coelom . These phyla are known...pseudocoelom and the coelom are fluid-filled body...characterized by pseudo-coeloms. These include the roundworms...
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Annelida
Book article from: The Columbia Encyclopedia, Sixth Edition
...the body wall by the body cavity, called the coelom . The segmented compartments of the coelom are usually separated from each other by thin...blood vessels. Except in the leeches, the coelom is fluid filled and functions as a skeleton...
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Animal
Encyclopedia entry from: UXL Encyclopedia of Science
...of a body cavity called the coelom (pronounced SEE-luhm). The coelom is a cavity in the body between...heart. Animal groups that have coeloms include Mollusca (snails...containing similar structures. Coelom: The cavity between the body...
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Peanut Worms
Encyclopedia entry from: The Gale Encyclopedia of Science
...internal organs inside a body cavity (coelom), that is lined by a fine epithelium...pressure of the fluid in the body cavity (coelom) occurring when feeding. The exact mode...detached and float in the body fluid in the coelom and help pick up waste products that are...
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