▁and ▁to ▁his ▁own ▁scientific ▁research . ▁In ▁ 1 9 4 1 , ▁Blo ch , ▁then ▁one ▁of ▁ten ▁Board ▁Govern ors ▁of ▁Sie ff ▁Institute , ▁was ▁nominated ▁as ▁its ▁first ▁and ▁sole ▁Man aging ▁Governor . ▁ ▁Later ▁on , ▁having ▁been ▁one ▁of ▁the ▁found ing ▁f athers ▁of ▁the ▁We iz mann ▁Institute ▁of ▁Science , ▁Blo ch ▁continued ▁in ▁the ▁position ▁of ▁Administr ative ▁Director ▁as ▁well ▁as ▁a ▁member ▁of ▁the ▁Board ▁of ▁Govern ors ▁and ▁of ▁all ▁the ▁coun c ils ▁and ▁comm itte es ▁of ▁the ▁Institute . ▁ ▁In ▁World ▁War ▁II , ▁when ▁supply ▁of ▁medic ines ▁from ▁Germany ▁stopped , ▁Blo ch ▁established ▁at ▁the ▁Institute ▁a ▁ph arma ce ut ical ▁factory , ▁" Pal est ine ▁Ph arma ce ut ical ▁Product s ▁L TD " ▁( P . PH . P .) ▁which ▁function ed ▁in ▁the ▁years ▁ 1 9 4 1 - 1 9 4 9 . ▁ ▁In ▁ 1 9 5 5 , ▁during ▁the ▁time ▁of ▁the ▁Soviet ▁Union ' s ▁Iron ▁Cur tain , ▁Blo ch ▁was ▁invited ▁by ▁Soviet ▁authorities ▁to ▁represent ▁Israel ▁at ▁the ▁session ▁of ▁the ▁Academy ▁of ▁Science ▁of ▁the ▁USS R ▁on ▁Peace ful ▁Util ization ▁of ▁At omic ▁Energy ▁that ▁took ▁place ▁in ▁Moscow ▁from ▁July ▁ 1 ▁to ▁ 5 , ▁just ▁before ▁the ▁" First ▁Gene va ▁Conference " ▁on ▁the ▁Peace ful ▁Us es ▁of ▁At omic ▁Energy . ▁ ▁As ▁the