منابع مشابه
Threonine Synthase of Lemna paucicostata Hegelm. 6746.
Threonine synthase (TS) was purified approximately 40-fold from Lemna paucicostata, and some of its properties determined by use of a sensitive and specific assay. During the course of its purification, TS was separated from cystathionine gamma-synthase, establishing the separate identity of these enzymes. Compared to cystathionine gamma-synthase, TS is relatively insensitive to irreversible in...
متن کاملAspartokinase of Lemna paucicostata Hegelm. 6746.
A sensitive and specific method was developed for assay of aspartokinase (EC 2.7.2.4) in crude extracts of Lemna paucicostata. Lysine inhibited approximately 93%, and threonine approximately 6%; together, these amino acids inhibited 99%. Inhibition by lysine was synergistically increased by S-adenosylmethionine, which by itself had no effect on activity. Essentially complete inhibition of threo...
متن کاملUptake of Choline and Ethanolamine by Lemna paucicostata Hegelm. 6746.
Lemna paucicostata Hegelm. 6746 possesses specific systems for uptake of choline and ethanolamine. Each is distinct from the six other systems for uptake of organic compounds so far identified in this plant. Both systems show biphasic kinetics, so that uptake by them can be described as the composite result of two Michaelis-Menten processes. Inhibitor studies are reported which indicate the ver...
متن کاملLemna paucicostata Hegelm. 6746: LIFE CYCLE AND CHARACTERIZATION OF THE COLONY TYPES IN A POPULATION.
The sequence of frond emergence and the intervals required for daughter colony separation have been determined for Lemna paucicostata Hegelm. 6746 growing under standardized conditions. After separation of a new mother colony, the first daughter colony is produced from the left meristematic pocket and separates after approximately 60 hours, the second daughter, produced from the right pocket, s...
متن کاملResponses of Sulfur-Containing Compounds in Lemna paucicostata Hegelm. 6746 to Changes in Availability of Sulfur Sources.
The steady state concentrations of S-containing compounds formed in Lemna paucicostata Hegelm. 6746 in response to variations in source and concentrations of sulfur were measured. Neither growth rates nor protein accumulation were markedly affected by the various growth conditions. Ignoring complications due to possible compartmentation, the results are consistent with internal pools of both SO...
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ژورنال
عنوان ژورنال: Plant Physiology
سال: 1980
ISSN: 0032-0889,1532-2548
DOI: 10.1104/pp.65.5.913