Ten N 1 pyridylmethyl N arylacyl urea derivatives were synthesized by the nucleophilic addition reaction of N alkyl (2 chloro 5 pyridylmethyl)amine with 2,6 difluorophenylacyl isocyanate, and characterized by IR, 1H N...Ten N 1 pyridylmethyl N arylacyl urea derivatives were synthesized by the nucleophilic addition reaction of N alkyl (2 chloro 5 pyridylmethyl)amine with 2,6 difluorophenylacyl isocyanate, and characterized by IR, 1H NMR and elemental analysis. Preliminary biological tests showed that these compounds have good insecticidal activity against Nephotettix cincticeps and Mosquito larvae , especially, compounds 3f and 3j which could give 100% mortality for Nephotettix cincticeps in dosage with mass fraction of 5×10 -5 % .展开更多
A new purine nucleoside coupled with an amino acid derivative, N^2-（l-methoxycarbonylethyl）guanosine 1, along with β- carboline and russulaceramide was isolated from the fruiting bodies of Amanita exitialis, a newl...A new purine nucleoside coupled with an amino acid derivative, N^2-（l-methoxycarbonylethyl）guanosine 1, along with β- carboline and russulaceramide was isolated from the fruiting bodies of Amanita exitialis, a newly described poisonous mushroom. Its structure was elucidated by spectroscopic methods. This is the first report of naturally occurring nucleosides in which an a-amino acid derivative is bonded through its a-amino nitrogen to a nucleobase aglycone by a C-N bond. The new compound was found to be toxic in brine shrimp lethality test （BST）. C 2009 Published by Elsevier B.V. on behalf of Chinese Chemical Society.展开更多
Mutagenesis and retrotransposons have a close relationship, but little attention has been paid yet to the activity of retrotransposons produced by physical mutagens. The variation of retrotransposon WIS 2-1A activity ...Mutagenesis and retrotransposons have a close relationship, but little attention has been paid yet to the activity of retrotransposons produced by physical mutagens. The variation of retrotransposon WIS 2-1A activity in wheat （Triticum aestivum L.） embryos at three different growth times （30 h, 45 h and 60 h） was investigated after they had been treated with N^＋ implantation in a vacuum of 5× 10^-2 Pa and irradiation by ^60Coγ-ray respectively. For each of the three growth times the expression of WIS 2-1A showed almost entirely a same trend of downregulation, upregulation, then downregulation, and upregulation again with the increase in dose of N^＋ implantation, but the expression appeared irregular with the increase in irradiation of ^60Coγ-ray. In conclusion, the acutely activating effect of WIS 2-1A stimulated by vacuum and high dose N^＋ implantation within a shorter incubation time may provide a convenient tool to advance the research on mutagenic breeding and function genes.展开更多
文摘Ten N 1 pyridylmethyl N arylacyl urea derivatives were synthesized by the nucleophilic addition reaction of N alkyl (2 chloro 5 pyridylmethyl)amine with 2,6 difluorophenylacyl isocyanate, and characterized by IR, 1H NMR and elemental analysis. Preliminary biological tests showed that these compounds have good insecticidal activity against Nephotettix cincticeps and Mosquito larvae , especially, compounds 3f and 3j which could give 100% mortality for Nephotettix cincticeps in dosage with mass fraction of 5×10 -5 % .
基金supported by the Knowledge Innovation Program of the Chinese Academy of Sciences(No.KSCX2-YW-N-036).
文摘A new purine nucleoside coupled with an amino acid derivative, N^2-（l-methoxycarbonylethyl）guanosine 1, along with β- carboline and russulaceramide was isolated from the fruiting bodies of Amanita exitialis, a newly described poisonous mushroom. Its structure was elucidated by spectroscopic methods. This is the first report of naturally occurring nucleosides in which an a-amino acid derivative is bonded through its a-amino nitrogen to a nucleobase aglycone by a C-N bond. The new compound was found to be toxic in brine shrimp lethality test （BST）. C 2009 Published by Elsevier B.V. on behalf of Chinese Chemical Society.
基金supported by National Natural Science Foundation of China(Nos.10505018,30800204)the Chinese Ministry of Agriculture(No.200803034)
文摘Mutagenesis and retrotransposons have a close relationship, but little attention has been paid yet to the activity of retrotransposons produced by physical mutagens. The variation of retrotransposon WIS 2-1A activity in wheat （Triticum aestivum L.） embryos at three different growth times （30 h, 45 h and 60 h） was investigated after they had been treated with N^＋ implantation in a vacuum of 5× 10^-2 Pa and irradiation by ^60Coγ-ray respectively. For each of the three growth times the expression of WIS 2-1A showed almost entirely a same trend of downregulation, upregulation, then downregulation, and upregulation again with the increase in dose of N^＋ implantation, but the expression appeared irregular with the increase in irradiation of ^60Coγ-ray. In conclusion, the acutely activating effect of WIS 2-1A stimulated by vacuum and high dose N^＋ implantation within a shorter incubation time may provide a convenient tool to advance the research on mutagenic breeding and function genes.
