Research Themes and Trends of Hen of the Woods or Maitake Medicinal Mushroom Grifola frondosa (Agaricomycetes): A Bibliometric Analysis of the Knowledge Field.

This paper aims to characterize the knowledge field of Grifola frondosa and analyze its research themes and trends. CiteSpace, a powerful bibliometric analysis tool, was adopted to visualize the knowledge field of G. frondosa research for facilitating this current study. A total of 747 articles and reviews retrieved from the Web of Science Core Collection (WoSCC) database between 1998 and 2022 were analyzed by CiteSpace. It was found that China and Japan are the most influential countries in G. frondosa research. Secondly, polysaccharide, bioactivity, structural characterization, and submerged culture are the main themes of G. frondosa research, among which bioactivity and structural characterization are the current research hotspots. Finally, selenium polysaccharide and gut microbiota may be the emerging trends in G. frondosa research in the future. This study could help researchers discern the evolution and future trends of G. frondosa research and provide a reference for related research work.

Microbial degradation of petroleum characteristic pollutants in hypersaline environment, emphasizing n-hexadecane and 2,4 di-tert-butylphenol.

In this paper, nine strains of salt-tolerant petroleum-degrading bacteria were applied to an biological aerated filter. Simulating the degradation of high-salinity petroleum wastewater with n-hexadecane and 2,4-ditert-butylphenol as the primary pollutants and analyzing the structure of the biofilm at various salt concentrations. According to the results, when the salinity was 4%, the COD removal efficiency reached 74.34%. Various halotolerant microorganisms have adapted to various salt concentrations. At a salinity of 3%, n-hexadecane exhibited the best degradation effect, with a rate of 83.21%. Shewanella, Acinetobacter, and Marinobacter were the predominant bacterial groups at the time. At 4% salinity, Acinetobacter and Pseudomonas were the predominant bacteria, and the average 2,4-ditert-butylphenol degradation rate was the highest at 63.02%. This study provided an experimental basis for further studying the biological treatment of high-salinity petroleum wastewater.