Electrochemical Methods for Fundamental Data Measurements in Molten Salts
Not provided.
Materials Science↗
Engineering topics
Wang, Pu
Publications and source records attributed to Wang, Pu.
Global trends in Akkermansia muciniphila research: A bibliometric visualization
Background Akkermansia muciniphila is a member of the gut microbiome, using mucin as sources of carbon, nitrogen, and energy. Since the first discovery of this unique bacterium in 2004, A. muciniphila has been extensively studied. It is considered a promising “next-generation beneficial microbe.” The purpose of this paper is to sort out the research status and summarize the hotspots through bibliometric analysis of the publications of A. muciniphila. Methods The publications about A. muciniphila from January 2004 to February 2022 were obtained from the Web of Science Core Collection. Visualization analyses were performed using three bibliometric tools and GraphPad Prism. Results A total of 1,478 published documents were analyzed. Annual publication number grew from 1 in 2004 to 336 in 2021, with China being the leading producer (33.36%). De Vos, Willem M was the most productive author with the highest H-index (documents = 56, H-index = 37), followed by Cani, Patrice D (documents = 35, H-index = 25). And Scientific Reports published the most papers. PNAS was the keystone taxa in this field, with high betweenness centrality (0.11) and high frequency. The keywords with high frequency in recent years include: oxidative stress, diet, metformin, fecal microbiota transplantation, short-chain fatty acids, polyphenols, microbiota metabolites and so on. The keyword “oxidative stress” was observed to be increasing in frequency recently. Conclusion Over time, the scope of the research on the clinical uses of A. muciniphila has gradually increased, and was gradually deepened and developed toward a more precise level. A. muciniphila is likely to remain a research hotspot in the foreseeable future and may contribute to human health.
Li, Zitong↗
Metabolome and RNA-seq Analysis of Responses to Nitrogen Deprivation and Resupply in Tea Plant (Camellia sinensis) Roots
Nitrogen (N) is an important contributor in regulating plant growth and development as well as secondary metabolites synthesis, so as to promote the formation of tea quality and flavor. Theanine, polyphenols, and caffeine are important secondary metabolites in tea plant. In this study, the responses of Camellia sinensis roots to N deprivation and resupply were investigated by metabolome and RNA-seq analysis. N deficiency induced content increase for most amino acids (AAs) and reduction for the remaining AAs, polyphenols, and caffeine. After N recovery, the decreased AAs and polyphenols showed a varying degree of recovery in content, but caffeine did not. Meanwhile, theanine increased in content, but its related synthetic genes were down-regulated, probably due to coordination of the whole N starvation regulatory network. Flavonoids-related pathways were relatively active following N stress according to KEGG enrichment analysis. Gene co-expression analysis revealed TCS2 , AMT1;1 , TAT2 , TS , and GOGAT as key genes, and TFs like MYB, bHLH, and NAC were also actively involved in N stress responses in C. sinensis roots. These findings facilitate the understanding of the molecular mechanism of N regulation in tea roots and provide genetic reference for improving N use efficiency in tea plant.
Xu, Wenluan↗
Filming movies of attosecond charge migration in single molecules with high harmonic spectroscopy
Electron migration in molecules is the progenitor of chemical reactions and biological functions after light-matter interaction. Following this ultrafast dynamics, however, has been an enduring endeavor. Here we demonstrate that, by using machine learning algorithm to analyze high-order harmonics generated by two-color laser pulses, we are able to retrieve the complex amplitudes and phases of harmonics of single fixed-in-space molecules. These complex dipoles enable us to construct movies of laser-driven electron migration after tunnel ionization of N 2 and CO 2 molecules at time steps of 50 attoseconds. Moreover, the angular dependence of the migration dynamics is fully resolved. By examining the movies, we observe that electron holes do not just migrate along the laser polarization direction, but may swirl around the atom centers. Our result establishes a general scheme for studying ultrafast electron dynamics in molecules, paving a way for further advance in tracing and controlling photochemical reactions by femtosecond lasers.
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSIC↗
Modeling and Analysis of Eavesdropping Attack in 802.11ad mmWave Wireless Networks
Next generation wireless communication networks utilizing 60 GHz millimeter wave (mmWave) frequency bands are expected to achieve multi-gigabit throughput with the use of highly directional phased-array antennas. These directional signal beams provide enhanced security to the legitimate networks due to the increased difficulties of eavesdropping. However, there still exists significant possibility of eavesdropping since 1) the reflections of the signal beam from ambient reflectors enables opportunistic stationary eavesdropping attacks, and; 2) carefully designed beam exploration strategy enables active nomadic eavesdropping attack. This paper discusses eavesdropper attack strategies for 802.11ad mmWave systems and provides the first analytical model to characterize the success possibility of eavesdropping in both opportunistic stationary attacks and active nomadic attacks. We derive the success probability of eavesdropping considering the ambient reflectors in the environment and errors introduced in the beam exploration strategies of the proposed eavesdropping attacker models. We study the success probability for both opportunistic stationary attack scenario and active nomadic attack scenario through numerical simulations. In addition to numerical simulations, we also evaluate the proposed attacker models using an 802.11ad test bed consisting of commercially available off-the-shelf devices.
99 GENERAL AND MISCELLANEOUS↗