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In 1929, Manning ([5]) proved that if G is a primitive permutation group on Cl which is not 2-transitive, and if the stabilizer Ga of a point a e f i i s 2-transitive on an orbit F(a) with | F(a) | = v > 2, then Ga has an orbit A(a) with |A(a)| = w, where w > v and w\v(v— 1). In [1], I gave a shorter proof of this theorem, using combinatorial techniques(More)
Adhesion of Staphylococcus aureus to human endothelial cells is implicated in the pathogenesis of invasive staphylococcal disease. The adhesion to endothelial cells of isogenic mutants defective in defined surface structures was studied. Three strains of S. aureus defective in fibronectin-binding proteins FnBPA and FnBPB showed reduced adhesion. This was(More)
Demand curves were generated for five domestic hens under progressive-ratio 5 schedules of food delivery and under fixed-ratio schedules of food delivery that began at fixed-ratio 5 and were incremented by 5 each session. All sessions ended after 10 consecutive minutes without a response. Although response rates at a given ratio were higher under the(More)
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