Two sources of methionine (Met) activity are frequently used in commercial feed formulation: DL-2-hydroxy-4-(methylthio) butanoic acid (HMTBA), most commonly available as an 88% solution with 12% water; and DL-methionine (DLM, 99% powder). Despite the fact that both compounds have been in commercial use for over 50 yr, controversy and confusion remain with respect to their relative bioefficacy ...

Lichens are symbiotic organisms that composed of fungal partners and photosynthetic algal partners. During the process in lichen thallus, fungus synthesizes certain secondary metabolites which lecanoric acid is very important terms antibiotic properties. Considering vital importance acid, present study aimed to produce from thallus Parmotrema austrosinense using Modified Bold’s basal salt mediu...