canada changed from miles to kilometers in 1971.
canada changed from miles to kilometers in 1971.
when did canada change from miles to kilometers?
1971
change became more rapid towards the close of the 1960s, as mainline churches including the anglicans began to see the first wave of evaporation from the pews. on 23 august 1967, the anglican church of canada agreed to permit the remarriage of divorced persons in their churches. ecumenical relationships were intensified, with a view to full communion. while negotiations with the largest canadian protestant denomination, the united church of canada, faltered in the early 1970s, the anglican church achieved full communion with the evangelical lutheran church in canada as the century drew to a close.
anglican church of canada
other research by tumpey and colleagues who reconstructed the h1n1 virus of 1918 came to the conclusion that it was most notably the polymerase genes and the ha and na genes that caused the extreme virulence of this virus. the sequences of the polymerase proteins (pa, pb1, and pb2) of the 1918 virus and subsequent human viruses differ by only 10 amino acids from the avian influenza viruses. viruses with seven of the ten amino acids in the human influenza locations have already been identified in currently circulating h5n1. this has led some researchers to suggest that other mutations may surface and make the h5n1 virus capable of human-to-human transmission. another important factor is the change of the ha protein to a binding preference for alpha 2,6 sialic acid (the major form in the human respiratory tract). in avian virus the ha protein preferentially binds to alpha 2,3 sialic acid, which is the major form in the avian enteric tract. it has been shown that only a single amino acid change can result in the change of this binding preference. altogether, only a handful of mutations may need to take place in order for h5n1 avian flu to become a pandemic virus like the one of 1918. however it is important to note that likelihood of mutation does not indicate the likelihood for the evolution of such a strain; since some of the necessary mutations may be constrained by stabilizing selection.
spanish flu research