... 
<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>
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<p>All content in PubMed ultimately comes from publishers
of biomedical journals, and journals that are to be included
in MEDLINE are subject to a selection process. The <ext-link
xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="uri"
xlink:href="http://www.nlm.nih.gov/pubs/factsheets/jsel.html">Fact
Sheet</ext-link> on <italic>Journal Selection for Index
Medicus<sup>&reg;</sup>/MEDLINE<sup>&reg;</sup></italic>
describes the journal selection policy, criteria, and procedures 
for data submission.</p>
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<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>
...