Analysis of cyclic nucleotides and cytokinins in minute plant samples using phase-system switching capillary electrospray-liquid chromatography-tandem mass spectrometry

adenina adenine analyse de tissus analytical methods apical meristems chemical composition chloroplaste chloroplasts citoquininas cloroplasto composition chimique cytokinine cytokinins espectrometria hplc ionisation ionization mass spectrometry meristemas apicales nicotiana tabacum nucleotide nucleotides plant analysis plant growth substances spectrometrie spectrometry sustancias de crecimiento vegetal tabac tabaco technique analytique tissue analysis tobacco zeatin zeatina