An ancient pheromonal signal is found in aquatic courting salamandrids and terrestrial courting plethodontids, two highly divergent salamander families. In the aquatic courting salamandrids Cynops pyrrhogaster and C. ensicauda, the decapeptide sodefrin is cleaved from a larger 189 amino acid Sodefrin Precursor Factor (SPF) protein and released from a gland...
Grass seed producers in Oregon's Willamette Valley have
employed the cultural practice of post-harvest open field burning
since the mid-1940's for purposes of field sanitation and crop residue
disposal This practice creates environmental quality problems of
air pollution during the late summer Recent public concern over
the valley's environmental quality...
The North Atlantic zone of Costa Rica is an alluvial plain, whose fairly good soils and warm, extremely wet climate generate serious weed problems in cultivated crops and pastureland. Basic foods - corn, beans, rice and yuca - are important small farm crops. New land is still being opened for...
Agricultural production in the Sahelian region of Africa is
among the lowest in the world. Cyclical infestations of locusts and
grasshoppers have contributed to this low productivity. The infestations
appear to be triggered by heavy rainfall at the beginning of a crop season
after extended drought. Because locusts and grasshoppers...
A method for isolating the salt gland (SG) from the larval brine
shrimp has been developed. This extra-renal organ is removed from 5-10%
of Stage Inauplii by vortexing after incubating the animals at 37°C for
8 hours in a saline solution buffered with 100 mM sodium phosphate at pH
7.6....