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The main antigenic substances are concentrated on the surface of spores , and are mostly located on the anterior and posterior end of the spore bodies . Two plantings of the main display beds are done each year : spring to summer , and summer to spring . The main evidential difficulties are the ephemeral nature of records such as ISP data logs and the capacity for the internet to be used anonymously ( AGEC 2000 ) . The main print media are the Government Gazette and its sister publications . The main new results are as follows : ( 1 ) A new form of strong-motion accelerogram ( spectrally maximized records or SMR ) and its associated generalized spectrum are proposed for earthquake engineering use .