A rare prenylated isoflavone-quinone from the roots of .

In order to make more rational use of , a systematic separation from the roots of was performed in the current study. The investigation of chemical constituents resulted in the isolation of a rare prenylated isoflavone-quinone, fleminquinone A (), together with four known analogues (). Their structures were established by extensive physical and spectroscopic data analysis.

Niche construction on environmental gradients: the formation of fitness valley and stratified genotypic distributions.

The process of niche construction can alter the trajectory of natural selection through organism-environment feedback. As such, the mechanism and impact of niche construction can be better investigated along environmental gradients. Here we investigate how the process of niche construction affects the distribution of genotypes and fitness landscape along an environmental gradient under three selection regimes, namely heterozygote superiority, genetic loci which dictates niche construction ability being either selectively neutral or non-neutral.