id	keyword
american_scientific_journal-6513	± <
american_scientific_journal-6513	matter
american_scientific_journal-6513	pistia
american_scientific_journal-6513	minor
american_scientific_journal-6513	values
american_scientific_journal-6513	river
american_scientific_journal-6513	matete
american_scientific_journal-6513	stratiotes
american_scientific_journal-6513	species
american_scientific_journal-6513	pistia stratiotes
american_scientific_journal-6513	concentrations