Background:The impact of the coronavirus disease 2019(COVID-19)pandemic on the etiology of non-COVID-19 viral pneumonia remains to be identified.We investigated the evolution of non-COVID-19 viral pneumonia in hospita...Background:The impact of the coronavirus disease 2019(COVID-19)pandemic on the etiology of non-COVID-19 viral pneumonia remains to be identified.We investigated the evolution of non-COVID-19 viral pneumonia in hospitalized patients before and after the COVID-19 pandemic.Methods:This is a single-center retrospective study.Patients who came to West China Hospital of Sichuan Univer-sity diagnosed with non-COVID-19 viral pneumonia from January 1,2016 to December 31,2021,were included and divided into pre-and post-COVID-19 groups according to the date of the COVID-19 outbreak in China.The results of 13 viral nucleic acid tests were compared between the two groups.Results:A total of 5937 patients(3954 in the pre-COVID-19 group and 1983 in the post-COVID-19 group)were analyzed.Compared with the pre-COVID-19 group,the proportion of patients tested for respiratory non-COVID-19 viral nucleic acid was significantly increased in the post-COVID-19 group(14.78%vs.22.79%,P<0.05).However,the non-COVID-19 virus-positive rates decreased from 37.9% to 14.6% after the COVID-19 outbreak(P<0.001).Notably,non-COVID-19 viral pneumonia caused by the influenza A virus H1N1(InfAH1N1)(2009)dropped to 0%after the pandemic.The top three viruses were InfAH1N1(2009)(13.9%),human rhinovirus(7.4%),and human adenovirus(3.4%)in the pre-COVID-19 group,and human rhinovirus(3.8%),human respiratory syncytial virus(2.0%),human parainfluenza virus(1.1%)and InfAH3N2(1.1%)in the post-COVID-19 group.Conclusions:The proportion of non-COVID-19 viral pneumonia decreased significantly after the COVID-19 out-break,among which InfAH1N1(2009)pneumonia decreased the most dramatically.展开更多
Lanthanides(Ln^(3+))doped luminescent materials play critical roles in lighting and display techniques.While increasing experimental and theoretical research have been carried out on aluminate-based phosphors for whit...Lanthanides(Ln^(3+))doped luminescent materials play critical roles in lighting and display techniques.While increasing experimental and theoretical research have been carried out on aluminate-based phosphors for white light-emitting diodes(WLEDs)over the past decades,most investigation was mainly focused on their luminescent properties;therefore,the local structure of the light emission center remains unclear.Especially,doping-induced local composition and structure modification around the luminescent centers have yet to be unveiled.In this study,we use advanced electron microscopy techniques including electron diffraction(ED),high-resolution transmission electron microscopy(HRTEM),high-angle annular dark-field scanning transmission electron microscopy(HAADF-STEM),in combination with energy dispersive X-ray spectroscopy(EDX)and electron energy loss spectroscopy(EELS),to reveal atomically resolved crystalline and chemical structure of Ce^(3+)doped CaYAlO4.The microscopic results prove substantial microstructural and compositional inhomogeneities in Ce^(3+)doped CaYAlO_(4),especially the appearance of Ce dopant clustering and Ce^(3+)/Ce^(4+)valence variation.Our research provides a new understanding the structure of Ln^(3+)doped luminescent materials and will facilitate the materials design for next-generation WLEDs luminescent materials.展开更多
Industrial microbes have become the core of biological manufacturing,which utilized as the cell factory for production of plenty of chemicals,fuels and medicine.However,the challenge that the extreme stress conditions...Industrial microbes have become the core of biological manufacturing,which utilized as the cell factory for production of plenty of chemicals,fuels and medicine.However,the challenge that the extreme stress conditions exist in production is unavoidable for cell factory.Consequently,to enhance robustness of the chassis cell lays the foundation for development of bio-manufacturing.Currently,the researches on cell tolerance covered various aspects,involving reshaping regulatory network,cell membrane modification and other stress response.In fact,the strategies employed to improve cell robustness could be summarized into two directions,irrational engineering and rational engineering.In this review,the metabolic engineering technologies on enhancement of microbe tolerance to industrial conditions are summarized.Meanwhile,the novel thoughts emerged with the development of biological instruments and synthetic biology are discussed.展开更多
We investigate an optimal portfolio and consumption choice problem with a defaultable security. Under the goal of maximizing the expected discounted utility of the average past consumption, a dynamic programming princ...We investigate an optimal portfolio and consumption choice problem with a defaultable security. Under the goal of maximizing the expected discounted utility of the average past consumption, a dynamic programming principle is applied to derive a pair of second-order parabolic Hamilton-Jacobi- Bellman （HJB） equations with gradient constraints. We explore these HJB equations by a viscosity solution approach and characterize the post-default and pre-default value functions as a unique pair of constrained viscosity solutions to the HJB equations.展开更多
Predatory fungi possess intricate signal transduction systems that regulate their development and support successful infection of the host.Herein,we characterized three components of the cell wall integrity-controllin...Predatory fungi possess intricate signal transduction systems that regulate their development and support successful infection of the host.Herein,we characterized three components of the cell wall integrity-controlling pathway,namely protein kinase C(Ao PKC),SLT2-MAPK(Ao SLT2),and SWI6(Ao SWI6),in a representative nematode-trapping fungus Arthrobotrys oligospora,using gene disruption and multi-omics approaches.The phenotypic traits(such as mycelia development,conidiation,stress response,and trap morphogenesis) and metabolic profiles of ΔAopkc and ΔAoswi6 mutants were similar but differed from those of the ΔAoslt2 mutants.Transcriptomic analysis indicated that the genes differentially expressed in the absence of Aoswi6 were involved in DNA replication,repair,and recombination during trap formation.Moreover,the yeast two-hybrid assay showed that Ao PKC interacted with Ao SWI6,suggesting that in A.oligospora,PKC can directly regulate SWI6,bypassing the SLT2signaling cascade.Conclusively,our findings deepen our understanding of the regulatory mechanism of asexual development and lifestyle switching in nematode-trapping fungi.展开更多
基金supported by the National Key Research and Development Program(grant number:2022YFC2009804)Sichuan Science and Technology Program(grant number:2021YFS0003).
文摘Background:The impact of the coronavirus disease 2019(COVID-19)pandemic on the etiology of non-COVID-19 viral pneumonia remains to be identified.We investigated the evolution of non-COVID-19 viral pneumonia in hospitalized patients before and after the COVID-19 pandemic.Methods:This is a single-center retrospective study.Patients who came to West China Hospital of Sichuan Univer-sity diagnosed with non-COVID-19 viral pneumonia from January 1,2016 to December 31,2021,were included and divided into pre-and post-COVID-19 groups according to the date of the COVID-19 outbreak in China.The results of 13 viral nucleic acid tests were compared between the two groups.Results:A total of 5937 patients(3954 in the pre-COVID-19 group and 1983 in the post-COVID-19 group)were analyzed.Compared with the pre-COVID-19 group,the proportion of patients tested for respiratory non-COVID-19 viral nucleic acid was significantly increased in the post-COVID-19 group(14.78%vs.22.79%,P<0.05).However,the non-COVID-19 virus-positive rates decreased from 37.9% to 14.6% after the COVID-19 outbreak(P<0.001).Notably,non-COVID-19 viral pneumonia caused by the influenza A virus H1N1(InfAH1N1)(2009)dropped to 0%after the pandemic.The top three viruses were InfAH1N1(2009)(13.9%),human rhinovirus(7.4%),and human adenovirus(3.4%)in the pre-COVID-19 group,and human rhinovirus(3.8%),human respiratory syncytial virus(2.0%),human parainfluenza virus(1.1%)and InfAH3N2(1.1%)in the post-COVID-19 group.Conclusions:The proportion of non-COVID-19 viral pneumonia decreased significantly after the COVID-19 out-break,among which InfAH1N1(2009)pneumonia decreased the most dramatically.
基金funded by the National Natural Science Foundation of China(Nos.52002357,22105175,and 51932009)P.L.acknowledges the financial support from the Carlsberg Foundation(No.CF20-0612).
文摘Lanthanides(Ln^(3+))doped luminescent materials play critical roles in lighting and display techniques.While increasing experimental and theoretical research have been carried out on aluminate-based phosphors for white light-emitting diodes(WLEDs)over the past decades,most investigation was mainly focused on their luminescent properties;therefore,the local structure of the light emission center remains unclear.Especially,doping-induced local composition and structure modification around the luminescent centers have yet to be unveiled.In this study,we use advanced electron microscopy techniques including electron diffraction(ED),high-resolution transmission electron microscopy(HRTEM),high-angle annular dark-field scanning transmission electron microscopy(HAADF-STEM),in combination with energy dispersive X-ray spectroscopy(EDX)and electron energy loss spectroscopy(EELS),to reveal atomically resolved crystalline and chemical structure of Ce^(3+)doped CaYAlO4.The microscopic results prove substantial microstructural and compositional inhomogeneities in Ce^(3+)doped CaYAlO_(4),especially the appearance of Ce dopant clustering and Ce^(3+)/Ce^(4+)valence variation.Our research provides a new understanding the structure of Ln^(3+)doped luminescent materials and will facilitate the materials design for next-generation WLEDs luminescent materials.
基金supported by the National Key R&D Program of China(2021YFC2100800)Research and Development Program of PetroChina(21-LH-38-05).
文摘Industrial microbes have become the core of biological manufacturing,which utilized as the cell factory for production of plenty of chemicals,fuels and medicine.However,the challenge that the extreme stress conditions exist in production is unavoidable for cell factory.Consequently,to enhance robustness of the chassis cell lays the foundation for development of bio-manufacturing.Currently,the researches on cell tolerance covered various aspects,involving reshaping regulatory network,cell membrane modification and other stress response.In fact,the strategies employed to improve cell robustness could be summarized into two directions,irrational engineering and rational engineering.In this review,the metabolic engineering technologies on enhancement of microbe tolerance to industrial conditions are summarized.Meanwhile,the novel thoughts emerged with the development of biological instruments and synthetic biology are discussed.
文摘We investigate an optimal portfolio and consumption choice problem with a defaultable security. Under the goal of maximizing the expected discounted utility of the average past consumption, a dynamic programming principle is applied to derive a pair of second-order parabolic Hamilton-Jacobi- Bellman （HJB） equations with gradient constraints. We explore these HJB equations by a viscosity solution approach and characterize the post-default and pre-default value functions as a unique pair of constrained viscosity solutions to the HJB equations.
基金supported by the National Natural Science Foundation of China(31960556,U1402265,32160665)the Applied Basic Research Foundation of Yunnan Province(202001BB050004)Postdoctoral Science Foundation of Yunnan Province。
文摘Predatory fungi possess intricate signal transduction systems that regulate their development and support successful infection of the host.Herein,we characterized three components of the cell wall integrity-controlling pathway,namely protein kinase C(Ao PKC),SLT2-MAPK(Ao SLT2),and SWI6(Ao SWI6),in a representative nematode-trapping fungus Arthrobotrys oligospora,using gene disruption and multi-omics approaches.The phenotypic traits(such as mycelia development,conidiation,stress response,and trap morphogenesis) and metabolic profiles of ΔAopkc and ΔAoswi6 mutants were similar but differed from those of the ΔAoslt2 mutants.Transcriptomic analysis indicated that the genes differentially expressed in the absence of Aoswi6 were involved in DNA replication,repair,and recombination during trap formation.Moreover,the yeast two-hybrid assay showed that Ao PKC interacted with Ao SWI6,suggesting that in A.oligospora,PKC can directly regulate SWI6,bypassing the SLT2signaling cascade.Conclusively,our findings deepen our understanding of the regulatory mechanism of asexual development and lifestyle switching in nematode-trapping fungi.
