Link
https://bio.libretexts.org/Bookshelves/Microbiology/Book%3A_Microbiology_(Bruslind)/11%3A_Microbial_Nutrition
https://www.ritubiology.com/2016/06/21/microbial-nutrition-iii-how-do-bacteria-take-up-nutrients/
https://uomustansiriyah.edu.iq/media/lectures/6/6_2017_08_09!09_50_48_AM.pdf
