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References 1. Cavuoto, P., & Fenech, M. F. (2012). A review of methionine dependency and the role of methionine restriction in cancer growth control and life-span extension. Cancer Treat. Rev ., 38 , 726–736. 2. Lodi, F., Malizia, C., Castellucci, P., Cicoria, G., Fanti, S., & Boschi, S. (2012). Synthesis of oncological [ 11 C] radiopharmaceuticals for clinical PET. Nucl. Med. Biol ., 39 , 447–460. 3. Jacobs, A. H., Thomas, A., Kracht, L. W., Li, H., Dittmar, C., Garlip, G., Galldiks, N., Klein, J. C., Sobesky, J., Hilker, R., Vollmar, S., Herholz, K

References AOAC (1990). Official Methods of Analysis of the Association of Official Analytical Chemists, 15th ed., Arlington. Arctic Fox Standard (1999). Central Animal Breeding Office, Warszawa. Bieguszewski H., Gruda-Śmigiel M., Wislopolski A. (1979). The effect of supplementing protein-deficient diets with methionine and lysine on body weight, nutrient digestibility and selected blood parameters in Arctic foxes (in Polish). Zesz. Nauk. ATR Bydgoszcz, Zoot., 5: 280-284. Dahlman T., Valaja J., Niemela P., Jalava T. (2002). Influence of protein level and

. München Universität, pp.12 (in German). Chen DL, Dehdashti F. (2005). Advances in positron emission tomographic imaging of lung cancer. Proc Amer Thor Soc   2 : 541-544. Cook GJR, Maisey MN and Fogelman I. (1999). Normal variants, artefacts and interpretative pitfalls in PET imaging with 18-fluoro-2-deoxyglucose and carbon-11 methionine (Review article). Eur J Nucl Med   26 : 1363-1378. Edwards CH, Gadsen EL and Edwards GA. (1963). Utilization of methionine by adult rat, II Absorption and tissue uptake of L- and DL-methionine. J. Nutrition   80 (1): 69

. Technol., 31, 2008, 219-230. STEGINK, L.D., BELL, E.F., FILER, L.J., ZIEGLER, E.E., ANDERSEN, D.W., SELIGSONÄŽ, F.H.: Effects of equimolar doses of L-methionine, D-methionine and L-methionine-dl-sulfoxide on plasma and urinary amino acid levels in normal adult humans. J. Nutr., 116, 1986, 1185-1192. SUN, P., ARMSTRONG, D.W.: Effective enantiomeric separations of racemic primary amines by the isopropyl carbamate-cyclofructan6 chiral stationary phase. J. Chromatogr. A, 1217, 2010, 4904-4918. SUN, P., WANG, C., BREITBACH, Z.S., ZHANG, Y., ARMSTRONG, D.W.: Development of

controversial role of B-vitamins in cardiovascular risk: An update. Arch Cardiovasc Dis. 2009; 102(12):847-54. 11. Ball RO, Courtney-Martin G, Pencharz PB. The in vivo sparing of methionine by cysteine in sulfur amino acid requirements in animal models and adult humans. J Nutr. 2006; 136(6 Suppl):1682S-1693S. 12. Škovierová H, Vidomanová E, Mahmood S, Sopková J, Drgová A, Červeňová T, Halašová E, Lehotský J. The Molecular and Cellular Effect of Homocysteine Metabolism Imbalance on Human Health. Int J Mol Sci. 2016; 17(10). 13. Chamberlin ME, Ubagai T, Mudd SH, Wilson WG

ABBREVIATIONS AHDL - direct high-density cholesterol; ALB – albumin; ALP - alkaline phosphatase; ALT - alanine aminotransferase; AMY – amylase; AST - aspartate aminotransferase; bw – body weight BUN - blood urea nitrogen; Ca – calcium; Cl – chloride; CHOL – cholesterol; CREA – creatinine; ECL -electrochemiluminescence immunoassay system; GLUC – glucose; GGT - gamma glutamyl transferase; GSH – glutathione; Hcy – homocysteine; HHC – hyperhomocysteinemia; IBCT - total iron binding capacity; K – potassium; L-cys - L-cysteine LDL - low-density cholesterol; MET - DL-methionine

References Aebi H. (1984). Catalase in vitro. Meth. Enzymol., 105: 121-126. Albrecht A., Herbert U., Miskel D., Heinemann C., Braun C., Dohlen S., Zeitz J.O., Eder K., Saremi B., Kreyenschmidt J. (2017). Effect of methionine supplementation in chicken feed on the quality and shelf life of fresh poultry meat. Poultry Sci., 96: 2853-28611. British United Turkeys Ltd (BUT) (2012). Commercial performance goals. 5th ed. Broughton, Chester, UK: Warren Hall. http://www.aviagen.com/home.aspx?siteId=8 (accessed 22.11.2012). Chen Y.P., Chen X., Zhang H., Zhou Y.M. (2013

Abstract

The corrosion of metal surfaces causes huge financial damages to the industries annually, what has lead to an increase in the search for substances that can slow down or prevent corrosion rate. Green inhibitors which are biodegradable, without any heavy metals and other toxic compounds, are promoted. Amino acids are attractive as corrosion inhibitors because they are nontoxic. We have used methionine as corrosion inhibitor. Materials under investigation are two kind of low allow carbon steel marked as: Steel 39, Steel 44 usually applied to concrete as reinforcing bars, and manufacture in Elbasan. The inhibition effect of methionine on the corrosion behavior of low allow steel is investigated in sulfuric acid in presence of chloride ions, in form of NaCl (H2SO4 1M + Cl- 10-3M). Potentiodynamic polarization method is used for inhibitor efficiency testing. The pitting corrosion current shows that increasing concentration of the inhibitor causes a decrease in pitting current density, and inhibition efficiency increases with increasing concentration of the inhibitors.

References Baker D.H. (2009). Advances in protein-amino acid nutrition of poultry. Am. Aci., 37: 29-41. Bouyeh M. (2012). Effect of excess lysine and methionine on immune system and performance of broilers. Ann. Biol. Res., 3: 3218-3224. Brosnan J.T., Brosnan M.E. (2006). The sulfur-containing amino acids: an overview. J. Nutr., 136: 1636-1640. Bunchasak C. (2009). Role of dietary methionine in poultry production. J. Poultry Sci., 46: 169-179. BUT (2012). Commercial Performance Goals. http://www.aviagen.com/home.aspx?site Id=8 Calder P.C. (2006). Branched

References [1] H. E. Amos, C. O. Little, G. A. Digenis, G. T. Schelling, R. E. Tucker, G. E. Mitchell, Methionine, DL-homocysteine thiolactone, and N-acetyl-DL-methionine for ruminants. Journal of Animal Science , 39. (1974) 612–617. [2] M. J. Arambel, E. E. Bartley, J. L. Camac, S. M. Dennis, T. G. Nagaraja, A. D. Dayton, Rumen degradability and intestinal availability of a protected methionine products and its effects on rumen fermentation, and passage rate of nutrients. Nutrition Reports International , 35. (1987) 661–672. [3] J. R. Ashes, J. L. Mangan, G. S