Control of Free Methionine Production in Wild Type and Ethionine-resistant Mutants of Chlorella sorokiniana
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چکیده
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Control of Free Methionine Production in Wild Type and Ethionine-resistant Mutants of Chlorella sorokiniana.
Mutants of Chlorella sorokiniana selected for resistance to the methionine analogue ethionine took up ethionine at the same rate as did the wild type strain. Cells of two ethionine-resistant mutants produced severalfold higher levels of free methionine and cysteine than did wild type cells.Exogenous methionine had no apparent effect on free methionine production in a mutant that produces excess...
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Ethionine reduced both the growth rate and the final growth level of Serratia marcescens Sr41. Growth inhibition was completely reversed by methionine. Strain D-315, defective in homoserine dehydrogenase I, was more sensitive to ethionine-mediated growth inhibition than was the wild-type strain. Ethionine-resistant mutants were isolated from cultures of strain D-316, which was derived from stra...
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After x-ray irradiation, 13 mutants of Chlorella sorokiniana incapable of using NO(3) (-) as N source were isolated using a pinpoint method. Using immunoprecipitation and Western blot assays, no nitrate reductase was found in five strains while in eight mutants the enzyme was detected. The latter strains contained different patterns of nitrate reductase partial reactions. All isolates were of t...
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Production, quality control and biological evaluation of 153Sm-EDTMP in wild-type rodents
Introduction: Nowadays various bone pain palliative therapeutic agents have been developed for bone metastases. Among those, 153Sm-ethylenediamine tetramethylene phosphonic acid (153Sm-EDTMP) is the major therapeutic agent which is widely used in the world. In this study, production, quality control and biodistribution studies of this therapeut...
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ژورنال
عنوان ژورنال: Plant Physiology
سال: 1974
ISSN: 0032-0889,1532-2548
DOI: 10.1104/pp.53.3.469