41. Plants exclusively of the Capsicum genus produce capsaicinoids, which are alkaloids . 42. The distribution of alkaloids within tissues may also reflect defence against parasites. 43. The alkaloids are a class of chemical compounds containing a nitrogen ring. 44. Much of his subsequent work further developed understanding of the natural alkaloids . 45. Coniine eventually became the first of the alkaloids to be artificially synthesized. 46. Several pharmacologically active alkaloids have been detected in the plants. 47. Regrowth after grazing or mowing also shows a considerable increase in alkaloids . 48. The concentrations of alkaloids in all parts of the plant differ markedly. 49. The alkaloid content of dried foliage is about 44 mg / kg. 50. The alkaloids nigellicine, nigeglanine, and nigellidine are indazoles.
