| 1 | Artificial and Semi-artificial Photosynthesis(AP and SAP)Systems Based on Metal-Organic Frameworks显示文摘Recently,artificial and semi-artificial photosynthesis have attracted extensive attentions in addressing the crisis of energy from fossil fuels and reducing excessive CO_(2) emission.Metal-organic frameworks(MOFs)have been considered as ideal platforms for constructing artificial photosynthesis systems due to their unique properties like large specific surface area,high porosity and diverse framework topology,and tunable functionalities.This review discussed the characteristics,superiorities and challenges of MOF-based photocatalysts,and detailed summarization of several common design strategies for MOF-based artificial systems,including i)enhancement of light absorption,ii)acceleration of the charge separation and transfer,and iii)introduction of additional active units.Particularly,we give examples showing the applications of MOF-based photocatalysts,where the mechanisms of superior photocatalytic activity and selectivity are also analyzed,thereby providing theoretical guidance for rational design of MOF-based photocatalysts.Finally,the challenges and future research directions of MOF-based photocatalysts are prospected. | Guanglai Mo Qiao Wang Wanyue Lu Chen Wang Peng Li | 2023 | Chinese Journal of Chemistry2023，41，3： | 0 |
| 2 | Alternative splicing of POUM2 regulates embryonic cuticular formation and tanning in Bombyx mori显示文摘Insect cuticle is an apical extracellular matrix produced by the epidermis,tracheal,hind-and foregut epithelia during embryogenesis and renewed during molting and metamorphosis.However,the underlying regulatory mechanism for embryonic cuticle formation remains largely unclear.Here,we investigate the function of the transcription factor POUM2 in the embryonic cuticular formation in Bombyx mori,a model lepidopteran insect.Clustered regularly interspaced palindromic repeats(CRISPR)/CRISPR-associated protein-9-mediated knockout of POUM2 resulted in the defect of cuticular deposition,pigmentation,and sclerotization in the embryos.Differentially expressed transcripts analysis of 7-d-old embryos identified 174 up-or downregulated cuticular protein transcripts,8 upregulated chitin degradation transcripts,2 downregulated chitin synthesis transcripts and 48 up-or downregulated transcription factor transcripts in the POUM2−/−embryos.The expression levels of the key factors of the tyrosine metabolic pathway,such as tyrosine hydroxylase(Th),Dopa decarboxylase(DDC),and arylalkylamine N-acetyltransferase(aaNAT),were significantly decreased in the POUM2−/−embryos.POUM2 isoform POUM2-L specifically bound the POU cis-regulatory element(CRE)in the Th promoter and increased the transcription of Th,whereas POUM2-S could not bind the POU CRE,although it also increased the transcription of Th.Heterogeneous nuclear ribonucleoprotein Squid-1 directly bound the POUM2 pre-mRNA(messenger RNA)and inhibited the alternative splicing of POUM2-L to POUM2-S mRNA.These results suggest that POUM2 participates in the cuticular formation by regulating the chitin and cuticular protein synthesis and metabolism,and the cuticular pigmentation and sclerotization by regulating tyrosine metabolism during embryogenesis.This study provides new insights into novel function of POUM2 in embryogenesis. | Chunmei Tong Kang Zhang Zixia Rong Wanyu Mo Yuling Peng Sichun Zheng Qi-Li Feng Huimin Deng | 2023 | Insect Science2023，30，5： | 0 |
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