Evolution of multilocus genetic structure in an experimental barley population.

Data from 311 selfed families isolated from four generations (F8, F13, F23, F45) of an experimental barley population were analyzed to determine patterns of change in character expression for seven quantitative traits, and in single-locus allelic frequencies, and multilocus genetic structure, for 16 Mendelian loci that code for discretely recognizable variants. The analyses showed that large changes in single-locus allelic frequencies and major reorganizations in multilocus genetic structure occurred in each of the generation-to-generation transitions examined. Although associations among a few traits persisted over generations, dynamic dissociations and reassociations occurred among several traits in each generation-transition period.

Lithium modifies convulsions and brain phosphoinositide turnover induced by organophosphates.

Inositol-1-phosphate (Ins1P), an index of phosphoinositide (PI) turnover, was measured in frontal and piriform cortices, caudate, thalamus, hippocampus and cerebellum in saline or LiCl (5 m Eq./kg) pretreated rats 60 min. after graded doses of DFP, paraoxon, or soman.

Hierarchical patterns of correlated mating in Acacia melanoxylon.

Pollen of acacias is transported by insects as polyads, composite pollen grains. The polyad has enough pollen grains to fertilize all ovules within a flower and hence all seed within a pod may be full sibs. Isozyme markers were used to test this hypothesis in two populations of Acacia melanoxylon R.

Changes in the sense of balance correlate with concentrations of m-xylene in venous blood.

Nine healthy male volunteers were exposed to m-xylene for four hours a day, three hours in the morning and one hour in the afternoon, with a 40 minute break in between, at six day intervals during six succeeding weeks to explore the effects of m-xylene on the sense of balance. The atmospheric m-xylene concentrations were either fixed at 8.2 mumol/l (200 ppm) or they fluctuated (5.