Added bioimpedance assay

[jmillanacosta]

    <!-- http://purl.enanomapper.org/onto/ENM_9000269 -->

    <owl:Class rdf:about="http://purl.enanomapper.org/onto/ENM_9000269">
        <rdfs:subClassOf rdf:resource="http://www.bioassayontology.org/bao#BAO_0000015"/>
        <obo:IAO_0000115>Bioassay which measures the opposition to the flow of electrical current (impedance) through tissues, cell monolayers and single cells when an external alternating current (AC) field is applied. 
        This assay is label-free and constitutes a reliable alternative with the potential to become a method of choice for the initial screening of toxic effects in nanomaterials. Impedance-based monitoring takes advantage of the passive properties of an object, which occur when the object is composed of dissipative elements, such as ohmic resistors or conservative elements, such as capacitances and inductances . It measures the opposition to the flow of electrical current (impedance) through tissues, cell monolayers and single cells when an external alternating current (AC) field is applied.</obo:IAO_0000115>
        <rdfs:label xml:lang="en">Bioimpedance assay</rdfs:label>
        <rdfs:label xml:lang="en">Impedance-based cell assay</rdfs:label>
    </owl:Class>