真珠
2.Well, natural pearls are of higher value, but the cultured pearls have equal lustre and are just as beautiful.
3.B:Well,natural pearls are of hifher value,but the cultured pearls have equal luster and are just as beautiful.
7.As a result, nacre thickness is sometimes just a cosmetic layer that can wear thin over time
8.Not only then are the smaller, less robust creatures but the pollution in the water changes the color of the nacre and changes the color of the pearl.
9.we got the target 16S rDNA sequences of the PCR-amplification by primers of bacteria, archaea and fungi. This showed that the method of DNA extraction in this paper could well break the cells of rumen microorganisms including bacteria, fungi and protozoa into pieces and could meet needs for other subsequent studies.
10.Methods: The fragments of LCR and the human thalassemic β~(41/42) mutation Gene isolated from the beta thalassemia patients homozygous for the β~(41/42) mutation were amplified by PCR, and cloned into the stable mammalian expression vector pcDNA3.1(-) together, The recombinant plasmid was certified by enzyme-digestion and sequencing.
