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Ordinary superscripts:
...
<fig id="f7" orientation="portrait" position="float">
<label>FIG. 7.</label>
<caption>
<p>(2Si=O-H)<sup>+</sup> complex formation mechanism via three-fold
coordination of the O atom with subsequent H 1<italic>s</italic> level
lowering and extra electron donation to a DB in SiO<sub>2</sub> and to
the Si conduction band in the SiO<sub>2</sub>/Si interface, respectively.
Electron excitation over to the SiO<sub>2</sub> conduction band denoted
by a symbol × is not allowed because the energy needed for excitation over
to SiO<sub>2</sub> conduction band is larger than the H 1<italic>s</italic>
level lowering.</p>
</caption>
<graphic orientation="portrait" position="float" xlink:href="f7"/>
</fig>
...
... <p>... The recent discovery that Hfq is required for translation of the ς<sup>s</sup> subunit of RNA polymerase ... Template for synthesis of <sup>32</sup>P-labeled RNA primer (97RNA) was obtained ...</p> ...
As shown formatted above, a subscript and superscript in a “stacked” arrangement:
...
<body>
<p>The <italic>Escherichia coli argU</italic> gene encodes a minor arginine
tRNA, tRNA<sup arrange="stack">Arg</sup><sub arrange="stack">UCU</sub>,
which corresponds to the rare codon AGA and possibly AGG ...</p>
...
</body>
...
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