Background: Infectious diseases caused by bacteria are life-threating and are among the major causes of death in the world. Antibiotics have offered humans a new approach to infection control. Antibiotics are reckoned as the “magic bullets” for the fight against bacterial infections, therefore increasing life expectancy and decreasing mortality and morbidity. However, the overuse of antibiotics has resulted in the persistent growth of resistant bacterial pathogens. New antimicrobial approaches against resistant pathogens are being examined. Mushrooms seem to be a promising, and possibly more efficient, alternative method to that of conventional antimicrobials. This work aimed to investigate the phytochemical constituents and antimicrobial potential of ethanolic, aqueous, and dual solvent extracts of mushroom Ganoderma lucidum. Methods: The antimicrobial studies were carried out by broth dilution against Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli. The present research work was also carried out to examine genomic changes associated with ethanolic, aqueous, and dual solvent extracts of G. lucidum in S. aureus and E. coli. Results: Our data quantitatively showed that all the extracts of G. lucidum were found to exhibit various degrees of antimicrobial effects against S. aureus and E. coli where the ethanolic extract exhibited the most potent antimicrobial activity. SEM images showed untreated cells with normal cell characteristics while, after treatment with extracts of G. lucidum, cells appeared damaged with irregular cell surfaces and cell wall defacement. The results of HPLC analysis showed that ethanolic and aqueous extract of G. lucidum consisted of beta[1-3] glucans, ganoderic acid, and triterpenoids. Genomic analysis identified selective sweeps in several genes associated with growth, biosynthesis transport, and stress. Conclusions: This study concludes that the extracts of three solvents of G. lucidum have antimicrobial activity against infectious bacteria causing morphological changes and the acquisition of mutations in genes. Therefore, the extracts of G. lucidum may be candidates for preventing infectious diseases in the future. Ganoderma lucidum mushroom is therefore a reliable source of antimicrobial agent that can be used against infectious diseases.

Background and Objectives: The imminent threat of antibiotic resistance has spurred studies of nonconventional antimicrobial approaches. Gallium utilization is a promising and emerging approach to treating a variety of resistant bacteria using “Trojan horse” strategies to disrupt iron-dependent processes and biofilms. This study utilized experimental evolution to test the evolvability of gallium resistance in Staphylococcus aureus and resistance traits potentially correlated with metals, antibiotics and polyfluorinated compounds, as well as its genomics foundations. Methods: Whole-genome sequencing was utilized to reveal functional networks of mutations associated with gallium resistance. Additionally, scanning electron microscopy (SEM) observation was utilized to visualize distinct morphological changes on the surface of gallium-resistant populations and compare with the control populations. Results: As demonstrated by these studies, S. aureus evolved resistance to gallium after 20 days of selection. Furthermore, these populations displayed resistance traits correlated with heavy metals and polyfluorinated compounds. In contrast, the gallium-resistant populations were very sensitive to antibiotics. Whole-genome analysis revealed significant polymorphisms in the gallium (III)-resistant populations for example, polymorphisms in staphyloferrinA export MFS transporter/D ornithine citrate ligase (sfaA/sfaD), teichoic acid D Ala esterase (fmtA), DUF3169 family protein (KQ76_RS01520) and adenine phosphoribosyltransferase (KQ76_RS08360), while polymorphisms in the ABC transporter permease subunit (pstC) and acyltransferase family protein (KQ76_RS04365) were unique to the control populations. The polymorphisms directly affected the cells’ morphology. SEM images showed significant external ultrastructural changes in the gallium-selected bacterial cells compared to the control cells. Conclusions: Our study confirmed that using gallium as an antimicrobial can have significant health and environmental implications.

This study aims to explore the advantages and drawbacks associated with the integration of videos and virtual simulations in university microbiology lab courses, comparing them to the traditional in-person approach at North Carolina A&T State University. Utilizing Qualtrics^XM survey software (XM/os2), data from 190 survey responses were analyzed to understand students’ preferences and perceptions. Participants were asked about their preferred learning style—traditional in-person, virtual, or a combination of both. Results indicated that 57.2% of students favored a hybrid approach, combining traditional in-person and virtual microbiology lab experiences, while 30.6% preferred in-person learning and 12.4% leaned towards virtual learning. Exploring student perceptions of lab simulations (Labster 7.25.0) and YouTube videos in comprehending microbiology lab etiquette, 65% found these resources beneficial, whereas 13.1% did not. When assessing students’ enjoyment of virtual lab simulations, responses varied, with 68.8% agreeing, 18% neither agreeing nor disagreeing, and 12.8% disagreeing with the statement “I enjoyed the virtual lab simulations”. This extensive exploration into student perspectives contributes insights for educators and institutions, guiding the development of effective pedagogical strategies in microbiology education amidst evolving instructional modalities. The findings underscore the significance of accommodating diverse learning preferences to enhance overall learning experiences. As educational institutions continue to work to recover from setbacks caused by the COVID-19 pandemic, results from this study will empower stakeholders to update their plans for responding to future pandemics.

Gram-negative bacterial infections pose a serious public health challenge due to their high global mortality rates and potential to cause severe complications. Antibiotics – one of the most impactful medical innovations of the 20th century – remain vital in treating life-threatening bacterial infections. However, the increasing prevalence of antibiotic resistance has made it progressively harder to treat Gram-negative bacterial infections effectively. Therefore, nanoparticles have gained attention as a promising alternative treatment owing to their targeted antibacterial properties. Among the various synthesis methods, green synthesis is considered one of the most effective approaches for nanoparticle production. In this study, silver nanoparticles were synthesized using a green approach that utilized silver nitrate salt and an extract derived from carpenter bee wings (CBWs). The synthesized nanoparticles were characterized using spectroscopic techniques and scanning electron microscopy. Their antibacterial activity was tested against two pathogenic Gram-negative bacteria using the broth dilution method. Furthermore, whole genome sequencing was conducted to assess the mutagenic effects of the biosynthesized silver nanoparticles on the two bacterial strains. The results demonstrated that the green-synthesized silver nanoparticles exhibit notable antibacterial activity, likely through electrostatic interactions that promote cell binding and induce significant morphological alterations. Genomic analysis revealed mutations associated with efflux pump regulation, neutralization, transport, energy metabolism, cell division, biosynthetic pathways, adaptation, and invasion in the tested strains. These findings demonstrate the potential of CBWs as a novel biological resource for the green synthesis of silver nanoparticles with antibacterial properties. However, the study also raises concerns regarding the potential for bacteria to develop resistance to nanoparticles over time.

The misuse of antibiotics is causing widespread antibiotic resistance, creating an urgent need for new treatment options such as nanoparticle-based therapies. This study aimed to compare silver nanoparticles (AgNPs) produced via green synthesis methods with those made through traditional chemical processes. Furthermore, the study investigated and contrasted the bacterial responses to these two types of AgNPs over a 21-day period of selection pressure using experimental evolution techniques. Analysis using scanning electron microscopy and transmission electron microscopy revealed a consistent, uniform morphology among the AgNPs produced via chemical methods. In contrast, AgNPs synthesized through green methods displayed an irregular morphology. Despite these morphological differences, all nanoparticles from both synthesis approaches were under 100 nm in diameter. These findings were further supported by the absorption spectrum data, which showed a maximum absorption peak between the 400 and 500 nm wavelength range. E. coli exposed to green synthesized AgNPs for 21 days adapted to their presence, exhibiting both enhanced resistance to the green synthesized AgNPs themselves and the development of cross-resistance to ionic silver, a pattern not observed in chemically synthesized AgNP-selected populations. Populations selected using chemical synthesized AgNPs did not develop increased resistance to either chemically or green synthesized AgNPs; however, they showed a slight increase in resistance to ionic silver. Genomics analysis identified polymorphism in genes in a green synthesized AgNP-resistant line including but not limited to the multidrug efflux transporter system (EmrAB), DUF4756 family protein (D1792_RS05680), putative zinc-binding protein YnfU/cold shock-like protein (ynfU/cspB) and imcF-related family protein (D1792_RS10035). Bacterial resistance to chemical AgNPs involves specific polymorphisms in key bacterial components like the RNA polymerase sigma factor (RpoE) and the EmrAB efflux pump. Collectively, the method used to synthesize the AgNPs influences their antibacterial efficacy and the likelihood of bacteria developing resistance. Understanding this interaction is vital for developing effective and resistance-controlled applications of AgNPs across medicine, environmental science, and industry.

Rising antibiotic resistance necessitates alternatives such as silver nanoparticles (AgNPs), which exhibit bactericidal activity via multi-target mechanisms (e.g., membrane disruption, ROS production). While resistance to chemically synthesized AgNPs exists, the potential for resistance to green-synthesized AgNPs, such as those from reishi mushroom, is unknown. This study compared S. aureus resistance development against both AgNP types using experimental evolution by analyzing genomic and morphological changes. Additionally, this work evaluated potential cross-resistance responses to ionic silver and investigated how adaptation to green-synthesized AgNPs affects sensitivity to chemically synthesized AgNPs (and vice versa). Rapid resistance, along with cross-resistance to silver ions, emerged in bacteria following 14 days of sublethal exposure to silver nanoparticles, regardless of whether they were chemically or biologically synthesized. While green-synthesized AgNPs demonstrated a substantial resistance to chemical variants (p < 0.05), the reverse effect was not as strong, and resistant populations showed distinct morphological adaptations. Genomic analysis highlighted convergent hard selective sweeps, identifying common mutations across both chemical and green AgNP-treated populations, with limited unique mutations found for either. These findings enhance our understanding of bacterial resistance mechanisms to nanomaterials, contributing to the development of safer, eco-friendly, and high-efficacy treatments against multidrug-resistant infection.