Posttranslational modifications(PTMs),such as ubiquitination and phosphorylation,regulate diverse cellular processes.Whereas individual contributions of PTMs to leaf senescence have been well documented,their crosstal...Posttranslational modifications(PTMs),such as ubiquitination and phosphorylation,regulate diverse cellular processes.Whereas individual contributions of PTMs to leaf senescence have been well documented,their crosstalk remains largely unexplored.In this study,we identified Arabidopsis To′xicos en Levadura 72(ATL72),a RING-type E3 ligase,as a positive regulator of leaf senescence in Arabidopsis.ATL72 targets senescence-suppressed protein phosphatase(SSPP),which negatively regulates leaf senescence by dephosphorylating Arabidopsis thaliana(A.thaliana)senescence-associated receptor-like kinase(AtSARK).Expression patterns of ATL72,SSPP,and AtSARK overlap during senescence initiation in leaf development,suggesting that these proteins coordinate to regulate senescence.Our results show that the effect of ATL72 on leaf senescence is dependent on AtSARK.Furthermore,ATL72 monoubiquitinates SSPP;this interaction does not affect the stability of SSPP but significantly reduces its ability to dephosphorylate AtSARK.The SSPPinduced delay in leaf senescence can be effectively rescued by ATL72.We also identified the monoubiquitination sites on SSPP.Collectively,these findings provide critical insights into how complex networks of PTM crosstalk orchestrate the initiation and progression of leaf senescence.展开更多
A triple-band miniaturized end-fire antenna based on the odd modes of spoof surface plasmonic polariton(SSPP)waveguide resonator is proposed in this paper.To meet the ever increasing demand for more communication chan...A triple-band miniaturized end-fire antenna based on the odd modes of spoof surface plasmonic polariton(SSPP)waveguide resonator is proposed in this paper.To meet the ever increasing demand for more communication channels and less antenna sizes,multi-band antennas are currently under intensive investigation.By a novel feeding method,three odd modes are excited on an SSPP waveguide resonator,which performs as an end-fire antenna operating at three bands,7.15-7.26 GHz,11.6-12.2 GHz and 13.5-13.64 GHz.It exhibits reasonably high and stable maximum gains of 5.26 dBi,7.97 dBi and 10.1 dBi and maximum efficiencies of 64%,92%and 98%at the three bands,respectively.Moreover,in the second band,the main beam angle shows a frequency dependence with a total scanning angle of 19°.The miniaturized triple-band antenna has a great potential in wireless communication systems,satellite communication and radar systems.展开更多
The purpose of this paper is to solve the problem of robust face recognition(FR) with single sample per person(SSPP). In the scenario of FR with SSPP, we present a novel model local robust sparse representation(LRSR) ...The purpose of this paper is to solve the problem of robust face recognition(FR) with single sample per person(SSPP). In the scenario of FR with SSPP, we present a novel model local robust sparse representation(LRSR) to tackle the problem of query images with various intra-class variations,e.g., expressions, illuminations, and occlusion. FR with SSPP is a very difficult challenge due to lacking of information to predict the possible intra-class variation of the query images.The key idea of the proposed method is to combine a local sparse representation model and a patch-based generic variation dictionary learning model to predict the possible facial intraclass variation of the query images. The experimental results on the AR database, Extended Yale B database, CMU-PIE database and LFW database show that the proposed method is robust to intra-class variations in FR with SSPP, and outperforms the state-of-art approaches.展开更多
基金supported by the National Natural Science Foundation of China(grant numbers 32270359 and 32070317).
文摘Posttranslational modifications(PTMs),such as ubiquitination and phosphorylation,regulate diverse cellular processes.Whereas individual contributions of PTMs to leaf senescence have been well documented,their crosstalk remains largely unexplored.In this study,we identified Arabidopsis To′xicos en Levadura 72(ATL72),a RING-type E3 ligase,as a positive regulator of leaf senescence in Arabidopsis.ATL72 targets senescence-suppressed protein phosphatase(SSPP),which negatively regulates leaf senescence by dephosphorylating Arabidopsis thaliana(A.thaliana)senescence-associated receptor-like kinase(AtSARK).Expression patterns of ATL72,SSPP,and AtSARK overlap during senescence initiation in leaf development,suggesting that these proteins coordinate to regulate senescence.Our results show that the effect of ATL72 on leaf senescence is dependent on AtSARK.Furthermore,ATL72 monoubiquitinates SSPP;this interaction does not affect the stability of SSPP but significantly reduces its ability to dephosphorylate AtSARK.The SSPPinduced delay in leaf senescence can be effectively rescued by ATL72.We also identified the monoubiquitination sites on SSPP.Collectively,these findings provide critical insights into how complex networks of PTM crosstalk orchestrate the initiation and progression of leaf senescence.
基金supported in part by the Natural Science Foundation of Tianjin(No.19JCYBJC16100)the Tianjin Innovation and Entrepreneurship Training Program(No.202210060027)。
文摘A triple-band miniaturized end-fire antenna based on the odd modes of spoof surface plasmonic polariton(SSPP)waveguide resonator is proposed in this paper.To meet the ever increasing demand for more communication channels and less antenna sizes,multi-band antennas are currently under intensive investigation.By a novel feeding method,three odd modes are excited on an SSPP waveguide resonator,which performs as an end-fire antenna operating at three bands,7.15-7.26 GHz,11.6-12.2 GHz and 13.5-13.64 GHz.It exhibits reasonably high and stable maximum gains of 5.26 dBi,7.97 dBi and 10.1 dBi and maximum efficiencies of 64%,92%and 98%at the three bands,respectively.Moreover,in the second band,the main beam angle shows a frequency dependence with a total scanning angle of 19°.The miniaturized triple-band antenna has a great potential in wireless communication systems,satellite communication and radar systems.
基金supported in part by the National Natural Science Foundation of China(61673402,61273270,60802069)the Natural Science Foundation of Guangdong Province(2017A030311029,2016B010109002,2015B090912001,2016B010123005,2017B090909005)+1 种基金the Science and Technology Program of Guangzhou of China(201704020180,201604020024)the Fundamental Research Funds for the Central Universities of China
文摘The purpose of this paper is to solve the problem of robust face recognition(FR) with single sample per person(SSPP). In the scenario of FR with SSPP, we present a novel model local robust sparse representation(LRSR) to tackle the problem of query images with various intra-class variations,e.g., expressions, illuminations, and occlusion. FR with SSPP is a very difficult challenge due to lacking of information to predict the possible intra-class variation of the query images.The key idea of the proposed method is to combine a local sparse representation model and a patch-based generic variation dictionary learning model to predict the possible facial intraclass variation of the query images. The experimental results on the AR database, Extended Yale B database, CMU-PIE database and LFW database show that the proposed method is robust to intra-class variations in FR with SSPP, and outperforms the state-of-art approaches.
