Haploidy or diploidy: which is better?

Although the evolutionary advantages of sexual reproduction have been extensively discussed, much less attention has been paid to haploid and diploid phases of the sexual life cycle. The relative lengths of these phases differ greatly in various taxa, including as extremes those with one or the other phase reduced to a single cell. Here we consider the efficiency of elimination of deleterious mutations as an evolutionary force and compare the mutation loads under haploid and diploid selection, Ln and L2n. With truncation-like selection, partial dominance, and heterozygous effect of a mutation less than about 1/4 its hemizygous effect, L2n less than Ln; otherwise L2n greater than Ln. The difference becomes important when the genomic deleterious mutation rate exceeds about 1 per genome. This suggests that the mutation rate, degree of dominance and mode of selection can be important in life-cycle evolution.     

用于生物模型的表面肌电信号处理

为了使从人体上采集到的表面肌电信号（sEMG）达到满足生物模型输入的要求,采用Matlab的Simulink和FDA工具对表面肌电信号的处理方法进行仿真研究。     

搜寻外星人的最诡异方法

搜寻外星文明一直是人类作为一个重要物种必须做的意义深远的事情之一。但是直到目前为止,我们还尚未发现地球以外存在的任何生命形式。搜寻地外文明计划可能只是硬性推销。即便如此,搜寻外星生命的工作仍在进行当中,科学家正在构想越来越极端的方法,通过调整我们的高科技天文学设备来检测恒星中存在的外星生命。