オルト

関: ortho

WordNet

the 15th letter of the Roman alphabet (同)o
the blood group whose red cells carry neither the A nor B antigens; "people with type O blood are universal donors" (同)type_O, group O
a mouth or mouthlike opening

PrepTutorEJDIC

《呼び掛けの名前の前につけて》『おお』,あ / (驚き・恐れ・喜び・苦痛などを表して)『おお』,ああ,まあ / 《肯定・否定を強めて》
oxygenの化学記号
ohmオーム / Old

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/10/21 06:35:10」(JST)

wiki en

[Wiki en表示]

A macron (/ˈmækrɒn, ˈmeɪ-/) is a diacritical mark, a straight bar ( ¯ ) placed above a letter, usually a vowel. Its name derives from the Greek makrón (μακρόν) meaning "long" and was originally used to mark long or heavy syllables in Greco-Roman metrics. It now more often marks a long vowel. In the International Phonetic Alphabet, the macron is used to indicate a mid-tone; the sign for a long vowel is instead a modified triangular colon ⟨ː⟩.

The opposite is the breve ⟨˘⟩, which marks a short or light syllable or a short vowel.

Uses

Syllable weight

In Greco-Roman metrics and in the description of the metrics of other literatures, the macron was introduced and is still widely used to mark a long (heavy) syllable. Even relatively recent classical Greek and Latin dictionaries^[1] are still concerned with indicating only the length (weight) of syllables; that is why most still do not indicate the length of vowels in syllables that are otherwise metrically determined. Many textbooks about Ancient Rome and Greece use the macron even if it was not actually used at that time.

Vowel length

The following languages or transliteration systems use the macron to mark long vowels:

Slavicists use the macron to indicate a non-tonic long vowel, or a non-tonic syllabic liquid, such as on l, lj, m, n, nj, and r. Languages with this feature include standard and dialect varieties of Serbo-Croatian, Macedonian,^{[citation needed]} Slovene, Bulgarian.^[2]
Transcriptions of Arabic typically use macrons to indicate long vowels — ا (alif when pronounced /aː/), و (waw, when pronounced /uː/ or /oː/), and ي (ya', when pronounced /iː/ or /eː/). Thus the Arabic word ثلاثة (three) is transliterated ṯalāṯah.
Some modern dictionaries and coursebooks of classical Greek and Latin, where the macron is sometimes used in conjunction with the breve. However, many such dictionaries still have ambiguities in their treatment and distinction of long vowels or heavy syllables. In romanization of Greek, the letters η (eta) and ω (omega) are transliterated, respectively, as ē and ō. This corresponds to vowel length, by contrast with the short vowels ε (epsilon) and ο (omicron), which are transliterated as plain e and o. In Latin long vowels may be marked, which at times was done also by the Romans (see apex).
The Hepburn romanization system of Japanese, for example, kōtsū (交通, こうつう) "traffic" as opposed to kotsu (骨, こつ) "bone" or "knack".
Baltic languages and Baltic-Finnic languages:
- Latvian. Ā, ē, ī, ū are separate letters that sort in alphabetical order immediately after a, e, i, u respectively. Ō was also used in Latvian, but it was discarded as of 1957.
- Lithuanian. Ū is a separate letter but is given the same position in collation as the unaccented u. It marks a long vowel; other long vowels are indicated with an ogonek (which used to indicate nasalization, but it no longer does): ą, ę, į, ų and o being always long in Lithuanian except for some recent loanwords. For the long counterpart of i, y is used.
- Livonian. Ā, ǟ, ē, ī, ō, ȱ, ȭ and ū are separate letters that sort in alphabetical order immediately after a, ä, e, i, o, ȯ, õ and u respectively.
- Samogitian. Ā, ē, ī, ū and ō are separate letters that sort in alphabetical order immediately after a, e, i, u and o respectively.
Transcriptions of Nahuatl, the Aztecs' language, spoken in Mexico. When the Spanish conquistadors arrived, they wrote the language in their own alphabet without distinguishing long vowels. Over a century later, in 1645, Horacio Carochi defined macrons to mark long vowels ā, ē, ī and ō, and short vowels with grave (`) accents. This is rare nowadays since many people write Nahuatl without any orthographic sign and with the letters k, s and w, not present in the original alphabet.
Modern transcriptions of Old English.
Latin transliteration of Pali and Sanskrit.
Polynesian languages:
- Cook Islands Māori. In Cook Islands Māori, the macron or mākarōna is not commonly used in writing, but is used in references and teaching materials for those learning the language.^[3]^[4]
- Hawaiian. The macron is called kahakō, and it indicates vowel length, which changes meaning and the placement of stress.
- Māori. Early writing in Māori did not distinguish vowel length. Some, notably Professor Bruce Biggs,^[5] have advocated that double vowels be written to mark long vowel sounds (for example, Maaori), but he was more concerned with their being marked at all than with the method that was chosen. The Māori Language Commission (Te Taura Whiri i te Reo Māori) advocates that macrons be used to designate long vowels. The use of the macron is widespread in modern Māori, although sometimes the trema mark is used instead (for example, "Mäori" instead of "Māori") if the macron is not available for technical reasons.^[6] The Māori words for macron are pōtae ("hat") or tohutō.
- Niuean. In Niuean, "popular spelling" does not worry too much about vowel quality’ (length), so the macron is primarily used in scholarly study of the language.^[7]
- Tahitian. The use of the macron is comparatively recent in Tahitian. The Fare Vānaʻa or Académie Tahitienne (Tahitian Academy) recommends using the macron, called the tārava, to represent long vowels in written text, especially for scientific or teaching texts.^[8]^[9] The macron seems to have received more widespread acceptance than the Academy's version of the glottal stop (called the ʻeta), as evidenced by the use of the macron (but not the ʻeta) in references not published by the Academy.^[10]^[11]^[12] There are, however, multiple ways of representing or ignoring vowel length in written text. The Tahitian Academy enumerates 14 orthographies in Tahitian, though not all are in common use.^[13] Furthermore not all of those systems represent long vowels in distinctly different fashions.
- Tongan and Samoan. Called the toloi/fakamamafa or fa'amamafa, respectively. Its usage is similar to that in Māori, including its substitution by a trema. Its usage is not universal in Samoan, but recent academic publications and advanced study textbooks promote its use.^[14]

Tone

The following languages or alphabets use the macron to mark tones:

In the International Phonetic Alphabet, a macron over a vowel indicates a mid-level tone.
In Pinyin, the official Romanization of Mandarin Chinese, macrons over a, e, i, o, u, ü (ā, ē, ī, ō, ū, ǖ) indicate the high level tone of Mandarin Chinese. The alternative to the macron is the number 1 after the syllable (for example, tā = ta1).
Similarly, the Cantonese Yale Romanization uses the macron to represent the high level tone, as in yāt gāan chāan tēng (一間餐廳, a restaurant).

Omission

Sometimes the macron marks an omitted n or m, like the tilde:

In Old English texts a macron above a letter indicates the omission of an m or n that would normally follow that letter.
In older handwriting such as the German Kurrentschrift, the macron over an a-e-i-o-u or ä-ö-ü stood for an n, or over an m or an n meant that the letter was doubled. This continued into print in English in the sixteenth century, and to some extent in German. Over a u at the end of a word, the macron indicated um as a form of scribal abbreviation.

Letter extension

The macron is used in the orthography of a number of vernacular languages of the Solomon Islands and Vanuatu, particularly those first transcribed by Anglican missionaries. The macron has no unique value, and is simply used to distinguish between two different phonemes.

Thus, in several languages of the Banks Islands, including Mwotlap,^[15] the simple m stands for /m/, but an m with a macron (m̄) is a rounded labial-velar nasal /ŋ͡mʷ/; while the simple n stands for the common alveolar nasal /n/, an n with macron (n̄) represents the velar nasal /ŋ/; the vowel ē stands for a (short) higher /ɪ/ by contrast with plain e /ɛ/; likewise ō /ʊ/ contrasts with plain o /ɔ/.

In Hiw orthography, the consonant r̄ stands for the prestopped velar lateral approximant /ᶢʟ/.^[16] In Araki, the same symbol r̄ encodes the alveolar trill /r/ – by contrast with r, which encodes the alveolar flap /ɾ/.^[17]

In Kokota, ḡ is used for the velar stop /ɡ/, but g without macron is the voiced velar fricative /ɣ/.^[18]

In Marshallese, a macron is used on four letters—ā n̄ ō ū—whose pronunciations differ from the unmarked a n o u. Marshallese uses a vertical vowel system with three to four vowel phonemes, but traditionally their allophones have been written out, so vowel letters with macron are used for some of these allophones. Though the standard diacritic involved is a macron, there are no other diacritics used above letters, so in practice other diacritics can and have been used in less polished writing or print, yielding nonstandard letters like ã ñ õ û, depending on displayability of letters in computer fonts.

The letter ā is pronounced [æ~ɛ], the palatalized allophone of the phoneme /a/.
The letter n̄ represents the velar nasal phoneme /ŋ/ and the labialized velar nasal phoneme /ŋʷ/, depending on context. The standard letter does not exist as a precombined glyph in Unicode, so the nonstandard variant ñ is often used in its place.
The letter ō is pronounced [ʌ] or [ɤ], which are the unrounded velarized allophones of the phonemes /ɜ/ and /ɘ/ respectively.
The letter ū is pronounced [ɯ], the unrounded velarized allophone of the phoneme /ɨ/.

Other uses

In older German and in the German Kurrent handwriting, a macron is used on some consonants, especially n and m, as a short form for a double consonant (for example, n̄ instead of nn).
In modernized Hepburn romanization of Japanese, an n with macron represents a syllabic n.
In Russian cursive, as well as in some others based on the Cyrillic script (for example, Macedonian), a lowercase Т looks like a lowercase m, and a macron is often used to distinguish it from Ш, which looks like a lowercase w (see Т). Some writers also underline the letter ш to reduce ambiguity further.

Also, in some instances, a diacritic will be written like a macron, although it represents another diacritic whose standard form is different:

In some Finnish, Estonian and Swedish comic books that are hand-lettered, or in handwriting, a macron-style umlaut is used for ä or ö (also õ and ü in Estonian), sometimes known colloquially as a "lazy man's umlaut". This can also be seen in some modern handwritten German.
In informal Hungarian handwriting, a macron is often a substitute for either a double acute or an umlaut. For this very reason,^{[clarification needed]} using it is often regarded as bad practice.
In informal handwriting, the Spanish ñ is sometimes written with a macron-shaped tilde: (n̄).

Medicine

In medical prescriptions and other handwritten notes, macrons mean:

ā, before, abbreviating Latin ante
c̄, with, abbreviating Latin cum
p̄, after, abbreviating Latin post
q̄, every, abbreviating Latin quisque (and its inflected forms)
s̄, without, abbreviating Latin sine
x̄, except

Mathematics and science

The overline is a typographical symbol similar to the macron, used in a number of ways in mathematics and science.

Music

In music, the tenuto marking resembles the macron.

The macron is also used in German lute tablature to distinguish repeating alphabetic characters.

Technical notes

description	character	Unicode	HTML
macron above	◌̄ combining	U+0304	̄
	◌¯ spacing	U+00AF	¯ ¯
	◌ˉ spacing	U+02C9	ˉ
macron below	◌̱ combining	U+0331	̱
macron below	◌ˍ spacing	U+02CD	ˍ
additional diacritic	Latin
—	Ā ā	U+0100 U+0101	Ā ā
	Ē ē	U+0112 U+0113	Ē ē
	Ī ī	U+012A U+012B	Ī ī
	Ō ō	U+014C U+014D	Ō ō
	Ū ū	U+016A U+016B	Ū ū
	Ȳ ȳ	U+0232 U+0233	Ȳ ȳ
	Ǣ ǣ	U+01E2 U+01E3	Ǣ ǣ
	Ḡ ḡ	U+1E20 U+1E21	Ḡ ḡ
diaeresis	Ǟ ǟ	U+01DE U+01DF	Ǟ ǟ
	Ȫ ȫ	U+022A U+022B	Ȫ ȫ
	Ǖ ǖ	U+01D5 U+01D6	Ǖ ǖ
	Ṻ ṻ	U+1E7A U+1E7B	Ṻ ṻ
dot above	Ǡ ǡ	U+01E0 U+01E1	Ǡ ǡ
dot above	Ȱ ȱ	U+0230 U+0231	Ȱ ȱ
dot below	Ḹ ḹ	U+1E38 U+1E39	Ḹ ḹ
dot below	Ṝ ṝ	U+1E5C U+1E5D	Ṝ ṝ
ogonek	Ǭ ǭ	U+01EC U+01ED	Ǭ ǭ
tilde	Ȭ ȭ	U+022C U+022D	Ȭ ȭ
acute	Ḗ ḗ	U+1E16 U+1E17	Ḗ ḗ
acute	Ṓ ṓ	U+1E52 U+1E53	Ṓ ṓ
grave	Ḕ ḕ	U+1E14 U+1E15	Ḕ ḕ
grave	Ṑ ṑ	U+1E50 U+1E51	Ṑ ṑ
Currency
bar	₫	U+20AB	₫
Cyrillic
—	Ӣ ӣ	U+04E2 U+04E3	Ӣ ӣ
—	Ӯ ӯ	U+04EE U+04EF	Ӯ ӯ
Greek
—
	Ᾱ ᾱ	U+1FB9 U+1FB1	Ᾱ ᾱ
	Ῑ ῑ	U+1FD9 U+1FD1	Ῑ ῑ
Ῡ ῡ	U+1FE9 U+1FE1	Ῡ ῡ

In LaTeX a macron is created with the command "\=", for example: M\=aori for Māori. In OpenOffice, if the extension Compose Special Characters is installed, a macron may be added by following the letter with a hyphen and pressing the user’s predefined shortcut key for composing special characters. A macron may also be added by following the letter with the character’s four-digit hex-code, and pressing the user’s predefined shortcut key for adding unicode characters.

References

^ P.G.W. Glare (ed.), Oxford Latin Dictionary (Oxford at the Clarendon Press 1990), p. xxiii: Vowel quantities. Normally, only long vowels in a metrically indeterminate position are marked.
^ Годечкият Говор от Михаил Виденов,Издателство на българската академия на науките,София, 1978, p. 19: ...характерни за всички селища от годечкия говор....Подобни случай са характерни и за книжовния език-Ст.Стойков, Увод във фонетиката на българския език , стр. 151.. (Bulgarian)
^ Buse, Jasper with Taringa, Raututi (Bruce Biggs and Rangi Moeka‘a, eds.). (1996). Cook Islands Maori Dictionary with English-Cook Islands Maori Finder List. Avarua, Rarotonga: The Ministry of Education, Government of the Cook Islands; The School of Oriental and African Studies, The University of London; The Institute of Pacific Studies, The University of the South Pacific; The Centre for Pacific Studies, The University of Auckland; Pacific Linguistics, The Research School of Pacific and Asian Studies, The Australian National University.
^ Carpentier, Tai Tepuaoterā Turepu and Beaumont, Clive. (1995). Kai kōrero: A Cook Islands Maori Language Coursebook. Auckland, New Zealand: Pasifika Press.
^ Yearbook of the Academy Council - 2000, Royal Society of New Zealand
^ Macron Issues - Te Taura Whiri i te Reo Māori - Māori Language Commission
^ Sperlich, Wolfgang B. (ed.) (1997). Tohi vagahau Niue – Niue language dictionary: Niuen-English with English-Niuean finderlist. Honolulu: University of Hawaii at Manoa Department of Linguistics.
^ Académie Tahitienne. (1986). Grammaire de la langue tahitienne. Papeete, Tahiti: Fare Vāna’a.
^ Académie Tahitienne. (1999). Dictionnaire tahitien-français: Faʻatoro parau tahiti-farāni. Papeete, Tahiti: Fare Vānaʻa.
^ LeMaître, Yves. (1995). Lexique du tahitien contemporain: tahitien-français français-tahitien. Paris: Éditions de l’IRD (ex-Orstom).
^ Montillier, Pierre. (1999). Te reo tahiti ’āpi: Dictionnaire du tahitien nouveau et biblique. Papeete, Tahiti: STP Multipress.
^ Jaussen, Mgr Tepano. (2001). Dictionnaire de la langue Tahitienne (10ème édition, revue et augmentée). Papeete, Tahiti: Société des Études Océaniennes.
^ Académie Tahitienne (6 January 2003). Graphie et graphies de la langue tahitienne.
^ Simanu, Aumua Mata'itusi. 'O si Manu a Ali'i: A Text for the Advanced Study of Samoan Language and Culture
^ François, Alexandre (2005), "A typological overview of Mwotlap, an Oceanic language of Vanuatu", Linguistic Typology 9 (1): 115–146 [118], doi:10.1515/lity.2005.9.1.115
^ François, Alexandre (2010), "Phonotactics and the prestopped velar lateral of Hiw: resolving the ambiguity of a complex segment", Phonology 27 (3): 393–434, doi:10.1017/s0952675710000205 , p.421.
^ François, Alexandre (2008). "The alphabet of Araki".
^ Palmer, Bill. A grammar of the Kokota language, Santa Isabel, Solomon Islands. PhD dissertation.

External links

Diacritics Project — All you need to design a font with correct accents
Te māmā hoki o te patopato Information on typing macrons.
He Kupu o te Rā Information about typing macrons (Microsoft Windows only), macron support in email packages, and TXTing macrons.

UpToDate Contents

全文を閲覧するには購読必要です。 To read the full text you will need to subscribe.

1. メソアメリカ腎症 mesoamerican nephropathy
2. 成人における確定診断を得られていない低血圧やショックの評価および初期アプローチ evaluation of and initial approach to the adult patient with undifferentiated hypotension and shock
3. Management of perioperative heart failure in patients undergoing noncardiac surgery
4. 中央アフリカへの旅行によって感染する可能性のある疾患 diseases potentially acquired by travel to central africa
5. 頭部白癬 tinea capitis

English Journal

Synthesis of PtM (M=Co, Ni)/Reduced Graphene Oxide Nanocomposites as Electrocatalysts for the Oxygen Reduction Reaction.

Li J1, Fu X2, Mao Z3, Yang Y4, Qiu T5, Wu Q6.
Nanoscale research letters.Nanoscale Res Lett.2016 Dec;11(1):3. doi: 10.1186/s11671-015-1208-5. Epub 2016 Jan 5.
A series of PtM (M=Co, Ni)/reduced graphene oxide (rG-O) nanocomposites were successfully synthesized through a facile hydrothermal method. The as-synthesized nanocomposites were characterized using transmission electron microscopy and high-resolution transmission electron microscopy, X-ray diffract
PMID 26732276

Three-dimensional imaging of cholesterol and sphingolipids within a Madin-Darby canine kidney cell.

Yeager AN1, Weber PK2, Kraft ML1.
Biointerphases.Biointerphases.2016 Jun 8;11(2):02A309. doi: 10.1116/1.4939681.
Metabolic stable isotope incorporation and secondary ion mass spectrometry (SIMS) depth profiling performed on a Cameca NanoSIMS 50 were used to image the (18)O-cholesterol and (15)N-sphingolipid distributions within a portion of a Madin-Darby canine kidney (MDCK) cell. Three-dimensional representat
PMID 26746168

In-situ assembly of biocompatible core-shell hierarchical nanostructures sensitized immunosensor for microcystin-LR detection.

Gan C1, Ling L2, He Z1, Lei H2, Liu Y3.
Biosensors & bioelectronics.Biosens Bioelectron.2016 Apr 15;78:381-9. doi: 10.1016/j.bios.2015.11.072. Epub 2015 Dec 2.
Microcystin-LR (MC-LR) is a kind of hepatotoxin which can cause functional and structural disturbances of the liver, accumulate in aquatic organisms and transfer to higher trophic levels, a biocompatible electrochemical immunosensor was constructed to detect MC-LR sensitively and selectively. The th
PMID 26655177

Related Pictures

★リンクテーブル★

リンク元	「オルト」
拡張検索	「two-hybrid」「2-deoxy-D-arabino-hexose」
関連記事	「os」「O」

「オルト」

Ā	ā
Ā́	ā́
Ā̀	ā̀
Ā̂	ā̂
Ā͂	ā͂
Ǟ	ǟ
Ǡ	ǡ
Ǣ	ǣ
Ḇ	ḇ
C̄	c̄
Ḏ	ḏ
Ē	ē
Ḗ	ḗ
Ḕ	ḕ
Ē̂	ē̂
Ē͂	ē͂
Ḡ	ḡ
H̱	ẖ
Ī	ī
Ī́	ī́
Ī̀	ī̀
Ī̂	ī̂
Ī͂	ī͂
Ḵ	ḵ
Ḻ	ḻ
Ḹ	ḹ
M̄	m̄
Ṉ	ṉ
N̄	n̄
Ō	ō
Ṓ	ṓ
Ṑ	ṑ
Ō̂	ō̂
Ō͂	ō͂
Ȫ	ȫ
Ǭ	ǭ
Ȭ	ȭ
Ȱ	ȱ
R̄	r̄
Ṟ	ṟ
Ṝ	ṝ
T̄	t̄
Ṯ	ṯ
Ū	ū
Ū́	ū́
Ū̀	ū̀
Ū̂	ū̂
Ū͂	ū͂
Ǖ	ǖ
Ṻ	ṻ
V̄	v̄
W̄	w̄
X̄	x̄
Ȳ	ȳ
Ȳ́	ȳ́
Ȳ̀	ȳ̀
Ȳ̂	ȳ̂
Ȳ͂	ȳ͂
Ẕ	ẕ

◌̄
Macron
Diacritics
	accent
	acute( ´ )
	double acute( ˝ )
	grave( ` )
	double grave( ̏ )
	breve( ˘ )
	inverted breve( ̑ )
	caron, háček( ˇ )
	cedilla( ¸ )
	circumflex( ˆ )
	diaeresis, umlaut( ¨ )
	dot( · )
	hook, hook above( ̡ ̢ ̉ )
	horn( ̛ )
	iota subscript( ͅ )
	macron( ¯ )
	ogonek, nosinė( ˛ )
	perispomene( ͂ )
	ring( ˚, ˳ )
	rough breathing( ῾ )
	smooth breathing( ᾿ )
Marks sometimes used as diacritics
	apostrophe( ’ )
	bar( ◌̸ )
	colon( : )
	comma( , )
	hyphen( ˗ )
	tilde( ~ )
Diacritical marks in other scripts
	Arabic diacritics
	Early Cyrillic diacritics
	kamora( ҄ )
	pokrytie( ҇ )
	titlo( ҃ )
	Gurmukhī diacritics
	Hebrew diacritics
	Indic diacritics
	anusvara( ं ং ം )
	chandrabindu( ँ ఁ )
	nukta( ़ )
	virama( ् ് ్ ් ್ )
	chandrakkala( ് )
	IPA diacritics
	Japanese diacritics
	dakuten( ﾞ )
	handakuten( ﾟ )
	Khmer diacritics
	Syriac diacritics
	Thai diacritics
Related
	Dotted circle◌
	Punctuation marks
	Logic symbols
	This template: view; talk; edit;