ABSORPTION AND TRANSPORT BY THE TENTACLES OF DROSERA CAPENSIS: V. INFLUENCE ON THE TRANSPORT OF SUBSTANCES INHIBITING ENZYMATIC PROCESSES

摘要: The tentacles of the leaves Drosera have function secreting to leaf substances which are liberated by disintegration insects. An extensive survey has been given method research. difficulties met summed up in VIII pp. 98 and 99 methodical part it stated what extent possible find a working giving reliable results. principal results two previous publications, had published Dutch war time, summarized supplemented with new data. capensis genuine transport organs, themselves retain substance hardly analysable quantities, but pass on leaf. Important is dependence oxygen medium. Some not transported an anaerobic medium others only inhibited. first set absorbed from low concentration accumulated changed or unchanged form. We called this active transport. In latter case we spoken activated since diffusion process acts important part; pure diffusion, however, was found for any substance, as withdrawal always effects somewhat. This points influence processes plasm, connected metabolism. Amino acids, asparagine, glutamine, phosphates ammonium actively. For urea, thiourea, carbonate, caffeine, activation occurs different degree. amino asparagine glutamine one side that phosphate other common these actively, nature differs groups substances. specificity appears summation experiments. each uptake depends medium; already fairly concentrations maximal rate reached. Combination acids acid gives long limiting until saturation level indicates they all same system. phosphate, absorption till attained. These systems must work independently. led us 1944 draw hypothesis during combined plasm. Chemical reactions between plasmatic particles take place rendering possible. experiments indicate binding phosphates. theory through combining protoplasm based data (Arisz 1944) discussed pp 100 101. such antipyrine, ammoniumcarbonate inhibit especially higher acids. aggregation well. With aid inhibiting enzymatic processes, relation metabolism investigated. Such investigations have, instance, made Thimann collaborators growth, protoplasmic streaming water instance Lundegardh, Machlis Robertson salts. our wellknown inhibitors glycolysis respiration, KCN, Na-azide, jodoacetate Na-arsenate asparagine. Dinitrophenol likewise inhibits substances, energyrich process. significance processes. As competes arsenate, be understood arsenate no More specific behaviour phloridzin penicillin. last inhibitions prove previously formulated combination plasm correct. glands can cut off pair scissors. Marginal treated way behave essentially glands. They well without glands; dependent oxygen. are, therefore, essential tentacles, presence 1/100 M, very slight. concentration, 1/20 may greater, height intact gland, reminds gland (Coelingh). Inhibitors respiration partly tentacles. Na-azide Na-arsenite proves tentacle pedicel Various gave inhibition weaker than phenomenon yet explained. It wounding point fact certain localized gland. Eosin dye used render sieve tubes impossible. complete concentration. Fluorescein indicator parenchyma cells tubes. causes distinct