ABSTRACT. Dioscorea opposita Thunb., included in the genus Dioscorea of the family Dioscoreaceae, is an important herb with great edible and medicinal value. In this study, the total RNA from leaves of Lichuan Dioscorea opposita Thunb. was isolated by an improved Trizol method. The results showed that the RNA extracted by the improved Trizol method had good integrity, and the RNA could be used for downstream molecular biology operations including reverse transcriptionpolymerase chain reaction.

ABSTRACT. Aloe, an important folk herbal drug, includes abundant polysaccharides and secondary metabolites, which make it difficult to isolate high-quality DNA or RNA. In this paper, one and two improved methods were used to isolate the genomic DNA and RNA from the leaf of aloe, respectively. The obtained samples presented good quality and integrity; thus, they could be further used for many downstream molecular experiments. These reported protocols for DNA and RNA extraction offered a valuable reference for other related studies.

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Abstract-Nucleic acids are major biological molecules essential for life, and everyday, there are large number of nucleic acids sequences that are released and searched. Now, many nucleic acids databases were used to assembly and distribute structural information related nucleic acids on the internet. In order to find or submit quickly needed nucleic acids sequences, this present paper introduced seven popular nucleic acids databases,