Two different sections can be distinguished from this core by appearance judge and elements concentration: the upper 17cm section contains penguin bones and feathers, and bio-elements such as P、Mg、Cu、Zn、Cd and Ni have higher concentration in this section, indicating more influence from penguin activities.

According to comparative research on elementary character for sediment of Antarctic West Lake, fresh penguin dropping as well as guano soil of Ardley Peninsula and Pacific Island in South China Sea, it presents that the Y2 Lake sediment had been amended by penguin dropping.

A biotin labeling in situ hybridization technique was first used to physically map a low copy genes nac1 in maize, The cDNA clones of nacl gene which was only 550 bp in size was used as the probe for locating the gene nacl.