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across species lines. Formaldehyde is an essential metabolic intermediate in all cells. It is produced during the normal metabolism of serine, glycine, methionine, and choline and also by the demethylation of N-, S-, and O-methyl compounds. After oxidation of formaldehyde to formate, the carbon atom is further oxidized to carbon dioxide (CO2) or incorporated into purines, thymidine, and amino acids via tetrahydrofolatedependent one-carbon biosynthetic pathways. Exogenous formaldehyde appears to be readily absorbed from the respiratory and gastrointestinal tracts, but poorly absorbed following dermal application. Formaldehyde is metabolized to formate by the enzyme formaldehyde dehydrogenase; this appears to take place at the initial site of contact. Being normal components of intermediary metabolism, neither formaldehyde nor formate are stored to any significant extent in any tissue of the body
other important functions. Thus, some of the citric acid cycle are intermediates for other important reactions like the biosynthesis of glucose, fatty acids and amino acids. Due to the many functions of the citric acid cycle is also considered to be the "central hub of metabolism". This is because, as most of the absorbed nutrients, the fuel molecules are oxidized ultimately within the Krebs Cycke and its intermediates are used for various biosynthetic pathways. Figuratively, one can look at the citric acid cycle as a " roundabout" introduce, in which the nutrients (carbohydrates, fatty acids and amino acids) "drive in" and "drive out " again at the different locations for the synthesis of other substances. Tsitraaditsükli seos anaboolsete ja kataboolsete protsessidega. Anaboolsete protsessidega: ??? Kataboolsete protsessidega: Tsitraaditsüklisse võivad kataboolitavad ühendid
L. sakei seems very well suited phylogenetic groups: the L. casei subgroup, to derive energy from other compounds containing the facultative heterofermentative that are more abundant in meat. Its adaptation lactobacilli; the Leuconostoc group, which to meat, an environment rich in amino encompass the obligate heterofermentative; acids because of the activity of endogenous and the L. acidophilus group, composed of proteases, has caused it to lose biosynthetic obligate homofermentative lactobacilli. pathways for amino acid synthesis. L. sakei Only a limited number of Lactobacillus is therefore auxotrophic for all amino species is commonly isolated from meat fer- acids except aspartic and glutamic acid mentations and used as starter cultures. (Champomier-Verges et al. 2002). Amino Among them, L. sakei, L. curvatus and L. acid metabolism can provide an alternative
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