trans and cis, are known as configurational prefixes. They are
chemistry terms which by convention are not capitalised and are shown
General nomenclature. The IUPAC recommendations on chemical
nomenclature should be followed (IUPAC Compendium of Chemical
Terminology (1987, ISBN 0 632 01767 8, Blackwell Scientific
Publications, Oxford). All chemical names are run together except
those of acids, acetals, esters, ethers, glycosides, ketones and
salts, which are printed as separate words; hyphens are used to
separate numbers, Greek letters and some configurational prefixes,
e.g. p-nitrophenol. Italics are used for certain prefixes, e.g. cis-,
trans- and N. Small capitals are used for dextro- and laevo- prefixes,
Biophysical Journal style sheet
"trans (cis and trans) (these terms are part of the chemical
configuration and thus are not capitalized at the start of a sentence
or in titles."
Canadian Food Inspection Agency
"Is the word "trans" always shown in italics?
By scientific convention the word "trans" is italicized when it
appears in sentences and general text."
What are trans and cis? You can read more on these pages.
?In chemistry, a bond not subject to free rotation in which the
greater radical on both ends is on the opposite side of the bond is
?In chemistry, a double bond (or ring) in which the greater radical on
both ends is on the same side of the bond (or face of the ring) is
I hope this answers your question. If it does not, or the answer is
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trans italics cis
"configurational prefixes" trans