In this study, the fed-batch fermentation technique was applied to improve the yield of L-threonine produced by Escherichia coli TRFC. Various fermentation substrates and conditions were investigated to identify the optimal carbon source, its concentration and C/N ratio in the production of L-threonine. Sucrose was found to be the optimal initial carbon source and its optimal concentration was ...

Penelitian ini bertujuan untuk mengetahui pengaruh suplementasi l-threonine dalam pakan terhadap berat potong dan non-karkas ayam broiler. telah dilaksanakan di Kampung Bima, Kelurahan Kefa Selatan, Kabupaten Timor Tengah Utara Laboratorium Fakultas Pertanian Universitas Kefamenanu selama 7 minggu, sejak Desember 2019 sampai Januari 2020. menggunakan broiler berumur 14 hari sebanyak 80 ekor. Me...

Seven homoserine, 42 methionine, 42 threonine, and 15 isoleucine auxotrophs were obtained from Brevibacterium flavum No. 2247 (ATCC No. 14067) by X-ray irradiation and N-methyl-N'-nitro-N-nitrosoguanidine treatment. Concerning the L-lysine-producing ability, the homoserine auxotrophs were the best and about one-half of the threonine auxotrophs ranked next. The rest of threonine auxotrophs and a...

Culture forms of Trypanosoma brucei S42 were maintained in defined media by serial subculturing (Cross & Manning, 1973; Klein et al., 1975). Under these conditions considerable quantities of L-threonine were metabolized and equimolar concentrations of glycine and acetate were excreted. Glycine was identified by using an amino acid analyser and acetate was characterized as the p-bromophenacyl de...

Pentapeptides having the sequence R-HN-Ala-Val-X-Val-Leu-OMe, where the central residue X is L-serine, L-threonine, (2S,3R)-L-CF3-threonine and (2S,3S)-L-CF3-threonine were prepared. The capacity of (2S,3S)- and (2S,3R)-CF3-threonine analogues to stabilize an extended structure when introduced in the central position of pentapeptides is demonstrated by NMR conformational studies and molecular d...

The bioavailability of threonine in soybean meal and the effects of the excess amino acids in soybean meal on the estimate were measured using rats and chicks in slope-ratio assays. In Exp. 1, a corn-based diet containing .23% threonine was supplemented with 0 to 45% L-threonine in .05% increments. The growth rate of weanling rats fed these diets increased quadratically (P less than .001) with ...

O'Barr, Thomas P. (Agricultural Research Service, Washington, D.C.). Effect of alanine and threonine on the synthesis of serine by Leuconostoc mesenteroides. J. Bacteriol. 86:1321-1325. 1963.-Growth of Leuconostoc mesenteroides in the absence of serine was inhibited by l-alanine and l-threonine. Varying the glycine concentration when l-alanine was present suggested a direct relationship between...

A feeding trial was performed to evaluate the effects of dietary L-threonine supplementation on growth and body composition fingerlings Rhamdia quelen (initial weight: 4.47 ± 0.39 g). Five diets (370 g/kg crude protein 14.23 MJ / kg digestible energy) containing levels (16.0, 22.0, 28.0, 34.0, 40.0 g threonine/kg protein) were fed quadruplicate groups fishes for 10 weeks. The analysed variables...