It is known that ammonia (NH3) can inactivate single-stranded RNA viruses, but the mechanism is not fully unravelled. I suggest ammonia can twist the RNPs shown down to the right in this picture.

Picture from: http://www.virology.ws/2009/05/19/assembly-of-influenza-virus/
Ottar Stensvold Said,
mai 25, 2012 @ 11:43
Ammonia Disinfection of Hatchery Waste for Elimination of Single-Stranded RNA Viruses:
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3131629/?tool=pubmed
Ottar stensvold Said,
mai 29, 2012 @ 13:05
Mechanism of poliovirus inactivation by ammonia:
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC354068/?page=1
Ottar Stensvold Said,
april 6, 2013 @ 13:06
Maybe the ribonucleoproteins catalyse aminolysis of the RNA? – Naked, free single-stranded RNA in solution seems unaffected by NH3 while RNA inside viruses get cleaved into shorter strands by NH3. Phosphoester bond cleavages? And/or formation of amino phosphate?