alfalfa ( medicago sativa l. cv . canadian no . 1 ) , tobacco ( nicotiana tabacum l. var . humilis ) and wheat ( triticum monococcum l. ) cells were grown in a defined , liquid medium containing either ammonium sulfate , l-glutamine or potassium nitrate as the sole nitrogen source , and the effects of the tricarboxylic-acid ( tca ) intermediates , citrate and alpha-ketoglutarate ( 5 , 10 , 15 mm ) , on the growth ( dry-weight increase ) of these cells was observed .
C0040887
tricarboxylic-acid
C0008857
citrate