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The article focuses on studies on the use of nitrogen (N) isotopes methodology to examine diets of carnivorous plants. It discusses the role of stable isotopes, 15N and 14N in the growth of these plants, particularly in species which prey on insects for their food including Drosera, Nepenthes mirabilis and Cephalotus follicularis. It also explores the significance of the research for ecological and pollution studies.

The article provides a comparison of carnivorous plants in terms of enzymatic properties of the acid proteinase activities in the digestive fluids. The study includes plant samples of Nepenthes, Cephalotus, Dionaea, Drosera. Procedures in determining substrate specificity, proteinase and aminopeptidase activities are provided. Among the results indicated are two kinds of enzymes in Nepenthes and Cephalotus, pepstatin-insensitive acid proteinase in Dionaea and acid proteinases in Drosera.