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An isotactic macromolecule consists of 100% m diads, though IUPAC also allows the term for macromolecules with at least 95% m diads if that looser usage is explained. [3] Polypropylene formed by Ziegler–Natta catalysis is an example isotactic polymer. [8] Isotactic polymers are usually semicrystalline and often form a helix configuration.
In linguistics, grammatical relations (also called grammatical functions, grammatical roles, or syntactic functions) are functional relationships between constituents in a clause. The standard examples of grammatical functions from traditional grammar are subject , direct object , and indirect object .
Syntactic Structures was the fourth book in the Janua Linguarum series. It was the series's bestselling book. It was reprinted 13 times until 1978. [48] In 1962, a Russian translation by Konstantin Ivanovich Babisky, titled Синтакси́ческие структу́ры (Sintaksychyeskiye Struktury), was published in Moscow. [49]
In linguistics, the head or nucleus of a phrase is the word that determines the syntactic category of that phrase. For example, the head of the noun phrase boiling hot water is the noun (head noun) water. Analogously, the head of a compound is the stem that determines the semantic category of that compound.
A syntactic category is a syntactic unit that theories of syntax assume. [1] Word classes, largely corresponding to traditional parts of speech (e.g. noun, verb, preposition, etc.), are syntactic categories. In phrase structure grammars, the phrasal categories (e.g. noun phrase, verb phrase, prepositional phrase, etc.) are also syntactic ...
Under the minimalist program, syntactic structures are formed by iterative applications of the syntactic operation Merge, which serves to connect two elements into one. [7] To yield a linguistic expression , lexemes are selected out of the lexicon and make a (non-ordered) set of syntactic objects called a lexical array , and a structure is ...
A set of "subcategorization rules" then analyzes these symbols into "complex symbols", each complex symbol being a set of specified "syntactic features", grammatical properties with binary values. Syntactic feature is one of the most important technical innovations of the Aspects model. Most contemporary grammatical theories have preserved it.
In transformational grammar, systems of phrase structure rules are supplemented by transformation rules, which act on an existing syntactic structure to produce a new one (performing such operations as negation, passivization, etc.). These transformations are not strictly required for generation, as the sentences they produce could be generated ...