| 1 | Recent advances in the synthesis of discrete oligomers and polymers: chemistry, strategy and technology显示文摘Nature creates a variety of biomacromolecules, such as DNA and proteins, with precisely defined chain lengths/molecular weights (MWs), monomer sequences, and topologies. In contrast, traditional synthetic polymers have an inhomogeneous composition, variation in chain length. | Yaodi Chen Zhihao Huang Zhengbiao Zhang | 2022 | Science China Chemistry2022，65，6： | 1 |
| 2 | Pesticide Residue Content in Vegetable Bases of Lhasa City显示文摘[Objectives]To understand the quality safety of vegetables produced in vegetable planting bases around Lhasa City.[Methods]Four vegetable planting bases in the east,west,south,and north of Lhasa City were randomly selected for testing using rapid measuring instrument for agricultural residues and solid-phase microextraction-gas chromatography-mass spectrometer,with 120 vegetable samples selected.The testing samples included seven categories:green leafy vegetables,eggplants,melons,onions and garlic,root vegetables,beans,and fungi,totaling 29 types of vegetables.The samples were tested for 8 common prohibited and restricted pesticides in organic phosphorus and carbamate esters,including methamidophos,parathion,methyl parathion,monocrotophos,isocarbophos,methamidophos,aldicarb,and carbofuran.[Results]The pesticide inhibition rate of 6 kinds of vegetables detected by the rapid measuring instrument for agricultural residues was relatively high,with green leafy vegetables being the majority,reaching over 25%.By further establishing a solid-phase microextraction-gas chromatography-tandem mass spectrometry method,the accuracy of the data was verified experimentally.The experimental results indicated that the inhibition rate of vegetable samples in this experiment did not exceed 15%,and it was determined as a pollution-free vegetable.[Conclusions]According to the restriction standard of national pesticide use,the inhibition rate of vegetable samples was less than or equal to 40%,indicating that the quality of vegetables was qualified. | Yaodi LIU Ruiyang CHEN | 2023 | Asian Agricultural Research2023，15，11： | 0 |
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