Ethers are common in organic chemistry and pervasive in biochemistry, as they are common linkages in carbohydrates and lignin.

Ethers and tertiary amines are typically employed.

Ethers can be alkylated at oxygen only with difficulty, but thioethers are readily alkylated to give stable sulfonium salts, such as trimethylsulfonium iodide:

Polybrominated biphenyls and diphenyl Ethers / Oxides are used primarily as flame retardants.

Likewise, tan (), tan (), tan (), tan () all satisfy the irreducible polynomial, and so are conjugate algebraic integers.

The ' far-away light ' () is a reference to St Elmo's Fire, an electrical discharge supposed by ancient Greek mariners to be an epiphany of the Dioscuri, but the meaning of the line was obscured by gaps in the papyrus until reconstructed by a modern scholar — such reconstructions are typical of the extant poetry ( see Scholars, fragments and sources below ).

* Partial devoicing of sonorants – In English sonorants () are partially devoiced when they follow a voiceless sound within the same syllable.

Complex systems of predicting fate and destiny based on one's birthday, birth season, and birth hours, such as ziping and Zi Wei Dou Shu () are still used regularly in modern day Chinese astrology.

Many letters look similar but are distinguished from one another by dots () above or below their central part, called.

* The () or () order shown in the table below, used where lists of names and words are sorted, as in phonebooks, classroom lists, and dictionaries, groups letters by similarity of shape.

Aleut people () are the indigenous people of the Aleutian Islands of Alaska, United States and Kamchatka Krai, Russia.

As defined by Arrhenius, acid – base reactions are characterized by Arrhenius acids, which dissociate in aqueous solution to form hydrogen ions (), and Arrhenius bases, which form hydroxide () ions.

Free-swimming () organisms are relatively rare, with the majority of organisms being bottom dwelling ( benthic ) — either moving about ( vagrant ) or permanently attached to the sea floor ( sessile ).

The two Books of Samuel () are part of a series of historical books ( Joshua, Judges, Samuel and Kings ) that make up a theological history of the Israelites and affirm and explain God's law for Israel under the guidance of the prophets.

Some biblical scholars believe Jonah's prayer () to be a later addition to the story ( see source criticism for more information on how such conclusions are drawn ).

Bean () is a common name for large plant seeds of several genera of the family Fabaceae ( alternately Leguminosae ) some of which are used for human food or animal feed.

Beta-lactamases are enzymes () produced by some bacteria and are responsible for their resistance to beta-lactam antibiotics like penicillins, cephamycins, and carbapenems ( ertapenem ) ( Carbapenems are relatively resistant to beta-lactamase ).

The other organisations that maintain the SI system, also known by their French initialisms are the General Conference on Weights and Measures () ( CGPM ) and the International Committee for Weights and Measures () ( CIPM ).

The Banda Islands () are a volcanic group of ten small volcanic islands in the Banda Sea, about south of Seram Island and about east of Java, and are part of the Indonesian province of Maluku.

The chalcogens () are the chemical elements in group 16 ( old-style: VIB or VIA ) of the periodic table.

* User-defined () and compound types are possible.

Carboxylic acids () are organic acids characterized by the presence of at least one carboxyl group.

Chloroplasts () are organelles found in plant cells and other eukaryotic organisms that conduct photosynthesis.

At present () the museum is closed for refurbishment but there is a temporary museum, on the site, where all their ' star finds ' are displayed.

Cinquain () is a class of poetic forms that employ a 5-line pattern.

Joual () is the common name for the linguistic features of basilectal Quebec French that are associated with the French-speaking working class in Montreal which has become a symbol of national identity for a large number of artists from that area.

The river has been canalized with 34 large locks () to allow CEMT class V () vessels to navigate the total length of the river.

The class will implement a implementation () abstract class.

Italian Neorealism () is a national film movement characterized by stories set amongst the poor and the working class, filmed on location, frequently using nonprofessional actors.

Alum () is both a specific chemical compound and a class of chemical compounds.

In biological classification, class () is

In the Carpathian regions inhabited by Romanians, the boyar () class emerged from the chiefs ( named cneaz (" leader ") or jude (" judge ") in the areas north of the Danube and celnic south of the river ) of rural communities in the early Middle Ages, initially elected, who later made their judicial and administrative attributions hereditary and gradually expanded them upon other communities.

The lifeboat station is located on Riverside Road () from where are operated the Trent class lifeboat Samarbeta and the B class ( inshore ) lifeboat Seahorse IV.

In heraldry, gules () is the tincture with the colour red, and belongs to the class of dark tinctures called " colours ".

Distinctions are frequently made between " good " () and " bad " (), a dichotomy based on a class distinction between aristocrats and " others ", typical of the period but usually implicit in the works of earlier poets such as Homer —" In Theognis it amounts to an obsession ".

To implement the pattern, declare an abstract base class that specifies a pure virtual clone () method.

Any class that needs a " polymorphic constructor " capability derives itself from the abstract base class, and implements the clone () operation.

The client, instead of writing code that invokes the " new " operator on a hard-coded class name, calls the clone () method on the prototype, calls a factory method with a parameter designating the particular concrete derived class desired, or invokes the clone () method through some mechanism provided by another design pattern.

# The grammarians Dionysius Thrax and Dionysius of Halicarnassus class ζ with the " double " () letters ψ, ξ and analyse it as σ + δ. Contra: The Roman grammarian Verrius Flaccus believed in the opposite sequence, δ + σ ( in Velius Longus, De orthogr.

Tomme () is a type of cheese, and is a generic name given to a class of cheese produced mainly in the French Alps and in Switzerland.

The RBMK ( Reaktor Bolshoy Moshchnosti Kanalniy, " High Power Channel-type Reactor ") () is a class of graphite-moderated nuclear power reactor designed and built by the Soviet Union.