Authors:T. Veresegyházy, Hedvig Fébel, and Ágnes Rimanóczy
The absorption of three amino acids (leucine, alanine and lysine) from the washed, closed rumen was studied in a short-term (75 min) experiment in situ. The concentration of leucine and alanine did not change in the rumen during the experiment, while that of lysine continuously decreased, and 40% of the total lysine placed in the rumen was absorbed during the experimental period. The rate of absorption decreased in proportion to the fall of amino acid concentration.
Authors:F. Anzala, M.-C. Mor?re-Le Paven, C. Birolleau-Touchard, C. Giauffret, and A. M. Limami
Radicle elongation that allows rhizosphere colonization was used as a marker of seedling establishment. The goal of the present work was to determine the genetic basis of the effect of the aspartate family pathway, in particular lysine, on the radicle elongation of maize seedlings. For this purpose a population derived from an advanced backcross between a flint European line F2 and a highland tropical line F334 as the donor parent, was used for mapping QTLs related to the effect of lysine on radicle elongation. The parental lines showed contrasting germination efficiency and root elongation under both control conditions (imbibition on water at 20°C) and on medium supplied with lysine. Two QTLs for radicle elongation under control conditions were located on chromosome 2 (136 cM) near the marker bnlg1721 and on chromosome 5 (146 cM) near the marker umc1792. These QTLs explained 9.4% and 10.5%, respectively, of the phenotypic variability for radicle elongation. When germination was carried out on medium containing 5 mM lysine, three QTLs for radicle elongation were located on chromosome 7 (90 cM) near the marker umc1112, on chromosome 10 (42 cM) near the marker bnlg1037 and on chromosome 10 (68 cM) near the marker umc1053; these QTLs explained 12.0%, 12.3% and 12.4%, respectively, of the phenotypic variability for radicle elongation. Irrespective of the germination and post-germination medium, favourable alleles for all detected QTLs were associated with parental line F334.
Authors:Longshan Zhao, Qing Li, Yan Cui, Jie Wang, Shanshan Xu, Xiaohui Chen, and Kaishun Bi
Cefuroxime lysine, a new cefuroxime salt considered as the second-generation cephalosporins, has been invented by the Shenzhen Qingdazhong Biotech Co. Ltd. having the patent number of 201010191440.1 in China. Being
Authors:Zs. Sári, T. Kovács, T. Csonka, M. Török, É. Sebő, J. Toth, D. Tóth, E. Mikó, B. Kiss, D. Szeőcs, K. Uray, Zs. Karányi, I. Kovács, G. Méhes, P. Árkosy, and P. Bai
acids [ 10 ], lithocholic acid [ 7, 16 ] and cadaverine [ 6 ]. Cadaverine can be synthesized from lysine through decarboxylation by bacterial enzymes (LdcC and CadA) [ 17, 18 ], although the human body can also produce cadaverine. Shigella flexneri
Thin-layer chromatography of eight essential amino acids has been performed on silica layers with seventeen mobile phases of different composition. The mixed aqueous surfactant solution Triton X-100, 1.0 × 10
-sodium dodecyl sulfate, 8.1 × 10
-acetone 1:1:5 (
) was identified as the best mobile phase for specific separation of lysine. This separation can be successfully accomplished in the presence of impurities such as heavy metal cations, inorganic anions, and aliphatic and aromatic amines. The limit of detection of lysine was 0.5 μg per zone. The method has been used for successful identification of lysine in Astymin (Forte) and Alamine (Forte) capsules.
Authors:T. S. Martins, J. R. Matos, G. Vicentini, and P. C. Isolani
Rare earth picrate (RE) complexes with L-lysine (Lys) were synthesized and characterized. Elemental analysis (CHN), EDTA titrations and thermogravimetry data suggest
a general formula RE(pic)32Lys2H2O, where RE=La-Lu (without Pm) and Y, pic=picrate). IR spectra suggest that Lys is coordinated to the central ion through the nitrogen of the α-amino group. Parameters
obtained from the absorption spectrum of the Nd compound indicated that the metal-ligand bonds are essentially electrostatic.
Emission spectrum and biexponential behavior of the luminescence decay of the Eu compound suggest the existence of polymeric
species. Thermogravimetric/derivative thermogravimetric (TG/DTG) and differential scanning calorimetry (DSC) curves of all
complexes are very similar, with five events. The final products are the corresponding rare earth oxides and their X-ray diffraction
patterns are identical to the calcinated oxides.</o:p>