All the benefits of multi-vendor, converged networks without the operational headaches The IP/Optical convergence trend is in full swing, yet there continue to be challenges on the network operations side. Lack of coordination across IP and optical operations is not only inefficient but also could...
Change in the genetic makeup of a population over time is evolution. 种群在长期基因组成的变化称为进化,这句话点名了进化的基本单位是种群(population)。基因组成这个概念很笼统,在这里我们先理解为等位基因频率,也就是说在种群进化(microevolution)的驱动力是等位基因频率(或基因频率)的变化。什么是等位基因频率...
Although natural climate change may lead to changes in lake water levels, the impact of human activities is also notable, said Li. The results of the study have been published in the journal GSA Bulletin.■
根据上文“In biology, evolution is a process by which species change over time. Evolution is a theory-an explanation about how the world works, backed by evidence. The theory of evolution states that groups of organisms change over time.(在生物学中,进化是物种随时间变化的过程。 进化论是一种...
However, the deep pore-water samples for N2 sediments were located in the lower right corner, which represented the HCO3·SO4-Na type. As the depth increased, the pore-water in the middle layer transited to the lower right in turn. It is worth noting that the change process of cations ...
Changes in technology in the past decade have had such an impact on the way that molecular evolution research is done that it is difficult now to imagine working in a world without genomics or the Internet. In 1992, GenBank was less than a hundredth of its current size and was updated ev...
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These four mutations change the polarity or charge of the amino acid, which might severely affect the protein function of the neo-Y copies. We also detected a neo-Y-linked deletion in 3'-UTR of the gene SNX22 in both males investigated. This deletion abolishes a microRNA target site (...
However, the evolutionary dynamics of ontogenic color change are poorly understood. Using comparative phylogenetics, we studied the evolution of color defenses in the complex life cycles of swallowtail butterflies (family Papilionidae). We also tested the relative importance of life history traits, ...
In On the Origin of Species--that revolutionary treatise first published in 1859--Charles Darwin explained that life is the product of continuous change, that species come and go and are not fixed forever. Evolution is what happens over the long term when random 故事中间是尝试的一个史诗传说。