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Limited outcome studies exist , especially when administration is more than 1 h postingestion . The size of food plots varies according to landowner preferences and the requirements of the target wildlife species , but usually they are a minimum of 1/2 to 1 acre in size , with a maximum of 3 acres . " Wesley Autrey shouted from under the No. 1 train after it screeched to a halt . Knapp and his colleagues subsequently found that certain drugs such as the corticotropin releasing factor antagonist CRA1000 , the benzodiazepine receptor antagonist flumazenil , and the 5HT2C receptor antagonist SB242084 mitigated withdrawal-associated anxiety in these types of anxiety tests whereas withdrawal anxiety was not affected by the type 1 benzodiazepine receptor agonist zolpidem , the NMDA receptor antagonist ifenprodil , or the receptor 5HT3 antagonist MDL 72222 . The five land-ownership groups considered were : ( a ) landless households , ( b ) marginal farm households ( ownership of less than one acre of land [ 1 acre = 0.4 hectare ] ) , ( c ) middle-income households ( ownership of between one and two acres of land ) , ( d ) upper-middle-income households ( ownership of between two and four acres of land ) , and ( e ) upper income or rich households ( ownership of more than four acres of land ) . Strange considering the small Type 1 following .