/a><span class="lineno">  163</span>&#160;                                              <span class="stringliteral">&#39;DOD&#39;</span>,  <span class="comment"># deuterated water</span></div><div class="line"><a name="l00164"></a><span class="lineno">  164</span>&#160;                                              <span class="stringliteral">&#39;AST&#39;</span>,  <span class="comment"># arsenite</span></div><div class="line"><a name="l00165"></a><span class="lineno">  165</span>&#160;                      