Used to mark text that should remain in roman script no matter what style the surrounding text takes on.
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... <sec> <title>Seasonal Variations of <roman>CO</roman>, <roman>N<sub>2</sub>O</roman>, and <roman>CO<sub>2</sub></roman></title> <p>Recent evidence supports the premise that concentrations of major greenhouse gases vary ...</p> ... </sec> ...
... <p>... members of each group were asked to respond to several statements involving their emotional well-being and denoting anxiety and/or depression. Responses were limited to a 5-point scale (1 = <italic>completely disagree <roman>to 5 =</roman> completely agree</italic>) and were used subsequently to analyze the efficacy of the trial medication in comparison with sertaline and placebos.</p> ...