Summary
Germinated rice seedlings completely submerged under water do not show normal root growth and vertical shoot growth unless the water is aerated. From this observation, and earlier ones, it is concluded that rice seedlings in stagnant water in darkness will not develop normally unless a supply of oxygen can be received via the shoot.
Rengel, Z. and Kordan, H. A. 1987. Effects of growth regulators on light‐dependent anthocyanin production in Zea mays seedlings.The effects of ethylene, indolyl‐ and naphthylacetic acids, zeatin, benzyladenine, gib‐berellic acid and triiodobenzoic acid on anthocyanin production in seedlings of Zea mays L. cv. Golden Bantam were investigated. Endogenously produced and exogen‐ously supplied ethylene, as well as the other growth regulators tested markedly suppressed anthocyanin formation. Except for triiodobenzoic acid, the other growth regulators stimulated ethylene production, the amounts produced in the light being larger than those in the dark. Absorption of ethylene by permanganate as well as inhibition of ethylene production or action by Co2+ or Ag+ increased anthocyanin formation in maize seedlings above the level found in the control plants. The inhibiting effect of auxins and cytokinins on anthocyanin production was reversed by Co2+ or Ag+. In contrast, decreased anthocyanin formation caused by gibberellic acid or triiodobenzoic acid seemed unrelated to ethylene and could not be alleviated by Co2+ or Ag+.
all uterine fluid 24 hours before infusion with phenol red did, however, effect bromination.Further studies are in progress to determine the site and mechanism of the bromination. Perhaps there exists, in certain marine animals, an enzyme system which catalyzes the bromination described above. The biological halogenation of phenols may be analogous to the biogenesis of thyroxin where tyrosine residues undergo iodination (8).Abstract. A simple calculation shows that the K ions about to leave the nerve during excitation form a monolayer at the surface of the resting nerve and are not hydrated. The same applies to the Na ions which replace the K ions. This may be taken as an indication of the existence of a reversible ad-and desorption phenomenon.An important ionic relationship associated with the excitation process becomes apparent in the following way. Let it be assumed that there is a specific volume VK of the nerve substance in which the original concentration Ki of potassium ions changes to that of the bathing fluid Ko as a result of the net K ion loss incurred during a single discharge. This takes the form all uterine fluid 24 hours before infusion with phenol red did, however, effect bromination.Further studies are in progress to determine the site and mechanism of the bromination. Perhaps there exists, in certain marine animals, an enzyme system which catalyzes the bromination described above. The biological halogenation of phenols may be analogous to the biogenesis of thyroxin where tyrosine residues undergo iodination (8).
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.