Isozymes of two fire ant species and their hybrid

Electrophoretic banding patterns of eight enzyme systems in Solenopsis xyloni, S. germinata and their hybrid were studied. Repression of paternal alleles was found in aldehyde oxidase, isocitrate dehydrogenase, leucine amino peptidase and malic enzyme.     

Solar-tracking leaf movements in velvetleaf (Abutilon theophrasti)

Leaves of velvetleaf (Abutilon theophrasti) exhibited solar-tracking movements in several experiments using different cultural conditions near Ames, IA, U.S.A. Freely moving leaves maintained a smaller angle between the normal to the leaf and the sun's rays than did leaves fixed in one position in both greenhouse and field experiments. Freely moving leaves had higher total daily carbon gain, transpiration, and water use efficiency than leaves fixed in a horizontal position. Leaves on different sides of the plant exhibited different abilities to track the sun, with leaves on the north side of the plant least able to track the sun.     

Biochemical systematics of bees in the Ceratina calcarata-dupla complex

Using hexokinase and malate dehydrogenase as genetic markers, it was found that Ceratina calcarata and C. dupla interbred only occasionally in nature where they were sympatric. Therefore, they should be considered as two bona fide species, even though females are morphologically identical.