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In recent years , numerous instances of how technical artifacts embody political , cultural or econ omic positions have been identified ( see for example the collections edited by Bijker , Hughes and Pinch ,1987 and Bijker and Law , 1992 , as well as Winner , 1993 ) . It is believed that ionophores alter ruminal microflora via changes in the microbial membrane permeability ’ s to specific ions , thus altering various biological concentration gradients and selectively eliminating Gram-positive bacteria ( Russell et al ., 1987 ) . The new report , which covers 1987 , 1988 and 1989 , differs from its predecessors by including mortality data for surgical procedures for the first time . At the same time , the number of fourth births rose from about 1,600 in 1987 to over 2,000 annually over the next five years . Moreover , the Tax Division does want [ Claimant ] to understand that the 1987 statutory exemption found in Section 151.346 ( c ) applies only to certain services that became taxable in 1987 . The State 's Federal AFDC payments will be reduced by not less than one nor more than two percent of such payments from the beginning of the quarter in which the corrective action period expires ( in this case , from April 1 , 1986 ) and up to a year from the end of the corrective action period ( April 30 , 1987 ) .