PROTEINS
https://www.friedli.com/herbs/phytochem/proteins.html#determination
https://users.rcn.com/jkimball.ma.ultranet/BiologyPages/P/Proteins.html
https://web.mit.edu/esgbio/www/lm/proteins/aa/aminoacids.html
NUCLEOSIDS AND NUCLEOTIDES
https://merlin.mbcr.bcm.tmc.edu:8001/bcd/ForAll/Basics/nucleotides.html
NUCLEIC ACIDS