Sigma
Sigma (Σ, σ, ς)
Sigma (== Template:IPA ==
The Template:IPA (International Phonetic Alphabet) is a system of phonetic notation based primarily on the Latin alphabet. It was devised by the International Phonetic Association in the late 19th century as a standardized representation of the sounds of spoken language.
Pronunciation
The pronunciation of the term "IPA" is /aɪ piː eɪ/ in English.
Etymology
The term "IPA" is an acronym for the International Phonetic Alphabet. The International Phonetic Association, founded in 1886, created the IPA to provide a single, universal system for the transcription of spoken language.
Related Terms
- Phonetic notation: A system used to visually represent the sounds of speech. The IPA is one type of phonetic notation.
- Phonetics: The study of the physical sounds of human speech. It is concerned with the physical properties of speech sounds (phonemes), and the processes of their physiological production, auditory reception, and neurophysiological perception.
- Phonology: The study of the way sounds function within a particular language or languages. While phonetics concerns the physical production, acoustic transmission and perception of the sounds of speech, phonology describes the way sounds function within a particular language or languages.
- Transcription (linguistics): The systematic representation of spoken language in written form. The source of the words transcribe and transcription, the term means "to write across" in Latin, and it's the process of converting spoken language into written form. In linguistics, this is often done using the IPA.
External links
- Medical encyclopedia article on Sigma
- Wikipedia's article - Sigma
This WikiMD dictionary article is a stub. You can help make it a full article.
Languages: - East Asian
中文,
日本,
한국어,
South Asian
हिन्दी,
Urdu,
বাংলা,
తెలుగు,
தமிழ்,
ಕನ್ನಡ,
Southeast Asian
Indonesian,
Vietnamese,
Thai,
မြန်မာဘာသာ,
European
español,
Deutsch,
français,
русский,
português do Brasil,
Italian,
polski) is the 18th letter of the Greek alphabet. In the system of Greek numerals, it has a value of 200. The word is derived from the Phoenician letter šīn, meaning tooth.
In the context of medicine, Sigma is often used as a symbol to denote a sum or total, particularly in statistics and probability theory. It is also used in pharmacology to represent a prescription.
Medical Usage
In medical terminology, Sigma is used in various ways:
- Sigma receptor: A class of proteins that are targets of many psychoactive drugs. Sigma receptors are found in many tissues, and different types of sigma receptors may have different functions.
- Sigma factor: A protein needed for initiation of transcription in bacteria. Sigma factors are involved in the regulation of gene expression.
- Sigma phase: In metallurgy, a type of microstructure that can form in certain stainless steels. Although not directly related to medicine, the sigma phase can have implications for the performance of medical devices made from these materials.
Related Terms
- Sigma-1 receptor: A subtype of sigma receptor that has been implicated in the regulation of various cellular functions.
- Sigma-2 receptor: Another subtype of sigma receptor, which is thought to play a role in cell proliferation and death.
- Sigma bond: In chemistry, a type of covalent bond. Sigma bonds are important in the structure of many biological molecules.
- Sigma notation: A method of writing sums, often used in statistics and probability theory.
External links
- Medical encyclopedia article on Sigma
- Wikipedia's article - Sigma
This WikiMD dictionary article is a stub. You can help make it a full article.
Languages: - East Asian
中文,
日本,
한국어,
South Asian
हिन्दी,
Urdu,
বাংলা,
తెలుగు,
தமிழ்,
ಕನ್ನಡ,
Southeast Asian
Indonesian,
Vietnamese,
Thai,
မြန်မာဘာသာ,
European
español,
Deutsch,
français,
русский,
português do Brasil,
Italian,
polski