Iodine
Iodine is a chemical element with symbol I and atomic number 53. The name is from Greek ἰοειδής ioeidēs, meaning violet or purple, due to the color of iodine vapor.
Iodine and its compounds are primarily used in nutrition, and industrially in the production of acetic acid and certain polymers. Iodine's relatively high atomic number, low toxicity, and ease of attachment to organic compounds have made it a part of many X-ray contrast materials in modern medicine. Iodine has only one stable isotope. Iodine radioisotopes, such as 131I, are also used in medical applications.
Iodine is found on Earth mainly as the highly water-soluble iodide ion I−, which concentrates it in oceans and brine pools. Like the other halogens, free iodine occurs mainly as a diatomic molecule I2, and then only momentarily after being oxidized from iodide by an oxidant like free oxygen. In the universe and on Earth, iodine's high atomic number makes it a relatively rare element. Its presence in ocean water has given it a role in biology. It is the heaviest essential element used widely by life in biological functions (only tungsten, employed in enzymes by a few species of bacteria, is heavier). Iodine's rarity in many soils, due to initial low abundance as a crust-element, and also leaching of soluble iodide by rainwater, has led to many deficiency problems in land animals and inland human populations. Iodine deficiency affects about two billion people and is the leading preventable cause of intellectual disabilities.
Iodine (film)
Iodine is a 2009 Canadian Sci-Fi drama film written and directed by Michael Stasko.
Plot
John Clem (Michael Stasko) heads north to investigate the disappearance of his estranged father. Upon arriving at the family cottage, John runs into Avery (Ray Wise), his father’s colleague. John receives no help on his dad’s disappearance, but instead, a new set of eyes in which to view the living world around him. Avery assures John that they had been working on a special project which involved using iodine as a water purification tool, to preserve their natural surroundings. Environmental concerns and future implications of modernized society become a share interest and source of impassioned philosophical discussion for the two and they bond. However, John being a man of immense insecurity and uncertainty is forced to endure isolating surroundings while on the search for his father. The pressure from the rest of the family causes John an emotional breakdown as he is unsure of whether he can trust Avery.
Iodine (disambiguation)
Iodine is a chemical element.
Iodine or iodine may also refer to:
See also
Schema
The word schema comes from the Greek word σχήμα (skhēma), which means shape, or more generally, plan. The plural is σχήματα (skhēmata). In English, both schemas and schemata are used as plural forms.
Schema may refer to:
Computer science
Mathematics
Science
Degrees of Eastern Orthodox monasticism
The degrees of Eastern Orthodox monasticism are the stages an Eastern Orthodox monk or nun passes through in their religious vocation.
In the Eastern Orthodox Church, the process of becoming a monk or nun (female ascetics in the East are called monks, nun is a Western tradition) is intentionally slow, as the monastic vows taken are considered to entail a lifelong commitment to God, and are not to be entered into lightly. After completing the novitiate, there are three degrees of or steps in conferring the monastic habit.
Orthodox monasticism
Unlike in Western Christianity, where individual religious orders and societies arose, each with its own profession rites, in the Eastern Orthodox Church, there is only one type of monasticism. The profession of monastics is known as Tonsure (referring to the ritual cutting of the monastic's hair which takes place during the service) and was, at one time, considered to be a Sacred Mystery (Sacrament). The Rite of Tonsure is printed in the Euchologion (Church Slavonic: Trebnik), the same book as the other Sacred Mysteries and services performed according to need, e.g., funerals, blessings, exorcisms, etc.
Database schema
A database schema (/ˈski.mə/ SKEE-mə) of a database system is its structure described in a formal language supported by the database management system (DBMS). The term "schema" refers to the organization of data as a blueprint of how the database is constructed (divided into database tables in the case of relational databases). The formal definition of a database schema is a set of formulas (sentences) called integrity constraints imposed on a database. These integrity constraints ensure compatibility between parts of the schema. All constraints are expressible in the same language. A database can be considered a structure in realization of the database language. The states of a created conceptual schema are transformed into an explicit mapping, the database schema. This describes how real-world entities are modeled in the database.
"A database schema specifies, based on the database administrator's knowledge of possible applications, the facts that can enter the database, or those of interest to the possible end-users." The notion of a database schema plays the same role as the notion of theory in predicate calculus. A model of this "theory" closely corresponds to a database, which can be seen at any instant of time as a mathematical object. Thus a schema can contain formulas representing integrity constraints specifically for an application and the constraints specifically for a type of database, all expressed in the same database language. In a relational database, the schema defines the tables, fields, relationships, views, indexes, packages, procedures, functions, queues, triggers, types, sequences, materialized views, synonyms, database links, directories, XML schemas, and other elements.
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