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- 저자 : Li Runsheng (검색결과 3 건)
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Yongfei Zhu,Junming Su,Runsheng Lin,Peilin Li 한국고분자학회 2020 Macromolecular Research Vol.28 No.5
To introduce the para-position of phenol or aniline moiety into the crosslinked network of polybenzoxazine and improve its thermal stability, benzoxazine based on eugenol and 4,4’-diaminodiphenylmethane (e-ddm) was copolymerized with bisphenol A-aniline-based benzoxazine (b-a) or phenol-aniline-based benzoxazine (p-a). The differential scanning calorimetry and Fourier transform infrared spectroscopy (FTIR) results show that the carbenium ion intermediate from e-ddm could react with the para-position of phenol or aniline in b-a and p-a during the ringopening polymerization process, resulting in that the aniline and phenol moieties were introduced into cross-linked structures of polybenzoxazines. The thermogravimetric analysis (TGA) and TGA interfaced with FTIR results indicate that the thermal stability of polybenzoxazines increased with the incorporation of e-ddm, due to that the volatilization of phenol, aniline and their derivatives was restrained during the thermal degradation processes. Thereby, introducing e-ddm into benzoxazine is a better method of increasing the thermal stability of polybenzoxazine.
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Sui, Shiyan,Jia, Yimin,He, Bin,Li, Runsheng,Li, Xian,Cai, Demin,Song, Haogang,Zhang, Rongkui,Zhao, Ruqian Asian Australasian Association of Animal Productio 2014 Animal Bioscience Vol.27 No.12
Maternal malnutrition during pregnancy may give rise to female offspring with disrupted ovary functions in adult age. Neonatal ovary development predisposes adult ovary function, yet the effect of maternal nutrition on the neonatal ovary has not been described. Therefore, here we show the impact of maternal protein restriction on the expression of folliculogenic and steroidogenic genes, their regulatory microRNAs and promoter DNA methylation in the ovary of neonatal piglets. Sows were fed either standard-protein (SP, 15% crude protein) or low-protein (LP, 7.5% crude protein) diets throughout gestation. Female piglets born to LP sows showed significantly decreased ovary weight relative to body weight (p<0.05) at birth, which was accompanied with an increased serum estradiol level (p<0.05). The LP piglets demonstrated higher ratio of bcl-2 associated X protein/B cell lymphoma/leukemia-2 mRNA (p<0.01), which was associated with up-regulated mRNA expression of bone morphogenic protein 4 (BMP4) (p<0.05) and proliferating cell nuclear antigen (PCNA) (p<0.05). The steroidogenic gene, cytochrome P450 aromatase (CYP19A1) was significantly down-regulated (p<0.05) in LP piglets. The alterations in ovarian gene expression were associated with a significant down-regulation of follicle-stimulating hormone receptor mRNA expression (p<0.05) in LP piglets. Moreover, three microRNAs, including miR-423-5p targeting both CYP19A1 and PCNA, miR-378 targeting CYP19A1 and miR-210 targeting BMP4, were significantly down-regulated (p<0.05) in the ovary of LP piglets. These results suggest that microRNAs are involved in mediating the effect of maternal protein restriction on ovarian function through regulating the expression of folliculogenic and steroidogenic genes in newborn piglets.
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Zhang Yiwen,Yu Jinhan,Tan Lu,Wang Xingxing,Li Runsheng,Kim Dal Young 한국미생물학회 2021 The journal of microbiology Vol.59 No.11
Getah virus (GETV), which was first isolated in Malaysia in 1955, and Sagiyama virus (SAGV), isolated in Japan in 1956, are members of the genus Alphavirus in the family Togaviridae. It is a consensus view that SAGV is a variant of GETV. In the present study, we determined the complete sequences of the prototype GETV MM2021 and SAGV M6-Mag132 genomic RNA extracted from plaque-purified viruses. The MM2021 genome was 11,692 nucleotides (nt) in length in the absence of 3 poly(A) tail, and the length of M6-Mag132 genome was 11,698 nt. Through sequence alignment of MM2021 and M6-Mag132, we located all the amino acid differences between these two strains, which were scattered in all the encoded proteins. Subsequently, we validated the close evolutionary relationship between GETV and SAGV by constructing phylogenetic trees based on either complete genomes or structural genomes. We eventually analyzed the growth kinetics of GETV and SAGV as well as other representative alphaviruses in various mammalian and insect cell lines. It was shown that human-oriented cell lines such as HEK-293T and Hela cells were relatively resistant to GETV and SAGV infection due to absence of proviral factors or species-specific barrier. On the other hand, both GETV and SAGV replicated efficiently in non-human cell lines. Our results provide essential genetic information for future epidemiological surveillance on Alphaviruses and lay the foundation for developing effective interventions against GETV and SAGV.
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