期刊文献+
共找到4篇文章
< 1 >
每页显示 20 50 100
Interfacial engineering of graphitic carbon nitride(g-C_3N_4)-based metal sulfide heterojunction photocatalysts for energy conversion: A review 被引量:35
1
作者 yijie ren Deqian Zeng Wee-Jun Ong 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2019年第3期289-319,共31页
As one of the most appealing and attractive technologies, photocatalysis is widely used as a promising method to circumvent the environmental and energy problems. Due to its chemical stability and unique physicochemic... As one of the most appealing and attractive technologies, photocatalysis is widely used as a promising method to circumvent the environmental and energy problems. Due to its chemical stability and unique physicochemical, graphitic carbon nitride (g-C3N4) has become research hotspots in the community. However, g-C3N4 photocatalyst still suffers from many problems, resulting in unsatisfactory photocatalytic activity such as low specific surface area, high charge recombination and insufficient visible light utilization. Since 2009, g-C3N4-based heterostructures have attracted the attention of scientists worldwide for their greatly enhanced photocatalytic performance. Overall, this review summarizes the recent advances of g-C3N4-based nanocomposites modified with transition metal sulfide (TMS), including (1) preparation of pristine g-C3N4,(2) modification strategies of g-C3N4,(3) design principles of TMS-modified g-C3N4 heterostructured photocatalysts, and (4) applications in energy conversion. What is more, the characteristics and transfer mechanisms of each classification of the metal sulfide heterojunction system will be critically reviewed, spanning from the following categories:(1) Type I heterojunction,(2) Type II heterojunction,(3) p-n heterojunction,(4) Schottky junction and (5) Z-scheme heterojunction. Apart from that, the application of g-C3N4-based heterostructured photocatalysts in H2 evolution, CO2 reduction, N2 fixation and pollutant degradation will also be systematically presented. Last but not least, this review will conclude with invigorating perspectives, limitations and prospects for further advancing g-C3N4-based heterostructured photocatalysts toward practical benefits for a sustainable future. 展开更多
关键词 Graphitic carbon nitride Metal sulfide PHOTOCATALYSIS Energy transformation Water splitting Reduction of carbon dioxide Pollutant degradation Nitrogen fixation
下载PDF
TLR7/8 signalling affects X-sperm motility via the GSK3α/β-hexokinase pathway for the efficient production of sexed dairy goat embryos 被引量:5
2
作者 Fa ren Huaming Xi +8 位作者 yijie ren Yu Li Fei Wen Ming Xian Mengjie Zhao Dawei Zhu Liqiang Wang Anmin Lei Jianhong Hu 《Journal of Animal Science and Biotechnology》 SCIE CAS CSCD 2022年第2期401-417,共17页
Background:Goat milk is very similar to human milk in terms of its abundant nutrients and ease of digestion.To derive greater economic benefit,farmers require more female offspring(does);however,the buck-to-doe offspr... Background:Goat milk is very similar to human milk in terms of its abundant nutrients and ease of digestion.To derive greater economic benefit,farmers require more female offspring(does);however,the buck-to-doe offspring sex ratio is approximately 50%.At present,artificial insemination after the separation of X/Y sperm using flow cytometry is the primary means of controlling the sex of livestock offspring.However,flow cytometry has not been successfully utilised for the separation of X/Y sperm aimed at sexing control in dairy goats.Results:In this study,a novel,simple goat sperm sexing technology that activates the toll-like receptor 7/8(TLR7/8),thereby inhibiting X-sperm motility,was investigated.Our results showed that the TLR7/8 coding goat Xchromosome was expressed in approximately 50%of round spermatids in the testis and sperm,as measured from cross-sections of the epididymis and ejaculate,respectively.Importantly,TLR7/8 was located at the tail of the Xsperm.Upon TLR7/8 activation,phosphorylated forms of glycogen synthase kinaseα/β(GSK3α/β)and nuclear factor kappa-B(NF-κB)were detected in the X-sperm,causing reduced mitochondrial activity,ATP levels,and sperm motility.High-motility Y-sperm segregated to the upper layer and the low-motility X-sperm,to the lower layer.Following in vitro fertilisation using the TLR7/8-activated sperm from the lower layer,80.52±6.75%of the embryos were XX females.The TLR7/8-activated sperm were subsequently used for in vivo embryo production via the superovulatory response;nine embryos were collected from the uterus of two does that conceived.Eight of these were XX embryos,and one was an XY embryo.Conclusions:Our study reveals a novel TLR7/8 signalling mechanism that affects X-sperm motility via the GSK3α/β-hexokinase pathway;this technique could be used to facilitate the efficient production of sexed dairy goat embryos. 展开更多
关键词 Dairy goat Glycogen synthase kinaseα/β(GSK3α/β) Sexing control SPERM Toll-like receptor 7/8(TLR7/8)
下载PDF
Robust Fingerprint Localization Based on Massive MIMO Systems
3
作者 Xiaojun Wang yijie ren +1 位作者 Weiguang Sun Xiaoshu Chen 《China Communications》 SCIE CSCD 2022年第11期148-159,共12页
Location-based services have become an important part of the daily life.Fingerprint localization has been put forward to overcome the shortcomings of the traditional positioning algorithms in indoor scenario and rich ... Location-based services have become an important part of the daily life.Fingerprint localization has been put forward to overcome the shortcomings of the traditional positioning algorithms in indoor scenario and rich scattering environment.In this paper,a single-site multiple-input multiple-output(MIMO)orthogonal frequency division multiplexing(OFDM)system is modeled,from which an angle delay channel power matrix(ADCPM)is extracted.Considering the changing environment,auto encoders are used to generate new fingerprints based on ADCPM fingerprints to improve the robustness of the fingerprints.When the scattering environment has changed beyond a certain extent,the robustness will not be able to make up for the positioning error.Under this circumstance,an updating of the fingerprint database is imperative.A new fingerprint database updating algorithm which combines a new clustering method and an updating rule based on probability is proposed.Simulation results show the desirable performance of the proposed methods. 展开更多
关键词 massive multiple-input multiple-output fingerprint extraction ROBUSTNESS database updating
下载PDF
Control of CD4^(+) T cells to restrain inflammatory diseases via eukaryotic elongation factor 2 kinase 被引量:1
4
作者 Hao-Yun Peng Liqing Wang +7 位作者 Jugal Kishore Das Anil Kumar Darby JBallard yijie ren Xiaofang Xiong Paul de Figueiredo Jin-Ming Yang Jianxun Song 《Signal Transduction and Targeted Therapy》 SCIE CSCD 2023年第11期5503-5517,共15页
CD4^(+)T cells,particularly IL-17-secreting helper CD4^(+)T cells,play a central role in the inflammatory processes underlying autoimmune disorders.Eukaryotic Elongation Factor 2 Kinase(eEF2K)is pivotal in CD8^(+)T ce... CD4^(+)T cells,particularly IL-17-secreting helper CD4^(+)T cells,play a central role in the inflammatory processes underlying autoimmune disorders.Eukaryotic Elongation Factor 2 Kinase(eEF2K)is pivotal in CD8^(+)T cells and has important implications in vascular dysfunction and inflammation-related diseases such as hypertension.However,its specific immunological role in CD4^(+)T cell activities and related inflammatory diseases remains elusive.Our investigation has uncovered that the deficiency of eEF2K disrupts the survival and proliferation of CD4^(+)T cells,impairs their ability to secrete cytokines.Notably,this dysregulation leads to heightened production of pro-inflammatory cytokine IL-17,fosters a pro-inflammatory microenvironment in the absence of eEF2K in CD4^(+)T cells.Furthermore,the absence of eEF2K in CD4^(+)T cells is linked to increased metabolic activity and mitochondrial bioenergetics.We have shown that eEF2K regulates mitochondrial function and CD4^(+)T cell activity through the upregulation of the transcription factor,signal transducer and activator of transcription 3(STAT3).Crucially,the deficiency of eEF2K exacerbates the severity of inflammation-related diseases,including rheumatoid arthritis,multiple sclerosis,and ulcerative colitis.Strikingly,the use of C188-9,a small molecule targeting STAT3,mitigates colitis in a murine immunodeficiency model receiving eEF2K knockout(KO)CD4^(+)T cells.These findings emphasize the pivotal role of eEF2K in controlling the function and metabolism of CD4^(+)T cells and its indispensable involvement in inflammation-related diseases.Manipulating eEF2K represents a promising avenue for novel therapeutic approaches in the treatment of inflammation-related disorders. 展开更多
关键词 INFLAMMATORY DISEASES INFLAMMATION
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部