Publications by authors named "Ruyan Chen"

Incompatible plasmids play a crucial role in the horizontal transfer of antibiotic resistance in bacteria, particularly in Gram-negative bacteria, and have thus attracted considerable attention in the field of microbiological research. In the 1970s, these plasmids, housing an array of resistance genes and genetic elements, were predominantly discovered. They exhibit a broad presence in diverse host bacteria, showcasing diversity in geographic distribution and the spectrum of antibiotic resistance genes.

View Article and Find Full Text PDF
Article Synopsis
  • The study highlights the rise of carbapenem-resistant Enterobacter chuandaensis, a rare member of the Enterobacter cloacae complex, complicating infection treatment.
  • Researchers identified a specific strain, FAHZZU5885, from a patient in ICU, which carried multiple resistance genes and exhibited resistance to most antibiotics except a few.
  • Genetic analysis revealed that the strain harbored two different plasmids containing carbapenemase genes, raising concerns about its potential to spread and contribute to further resistance issues.
View Article and Find Full Text PDF

Plasmids, as important genetic elements apart from chromosomes, often carry multiple resistance genes and various mobile genetic elements, enabling them to acquire more exogenous genes and confer additional resistance phenotypes to bacteria. Various carbapenem resistance genes are often located on IncN plasmids, and several reports have linked fusion plasmids to IncN plasmids. Therefore, this study aims to explore the emergence, molecular structure characteristics, and resistance features mediated by IncN fusion plasmids carrying multiple carbapenem resistance genes.

View Article and Find Full Text PDF

Introduction: Immunotherapy has revolutionized the management of lung cancer and improved lung cancer survival in trials, but its real-world impact at the population level remains unclear.

Methods: Using data obtained from eight Surveillance, Epidemiology, and End Results (SEER) registries from 2004 through 2019, we addressed the long-term trends in the incidence, incidence-based mortality (IBM), and survival of lung cancer patients in the United States.

Results: The incidence and IBM of both non-small cell lung cancer (NSCLC) and small cell lung cancer (SCLC) all significantly decreased steadily from 2004 to 2019.

View Article and Find Full Text PDF
Article Synopsis
  • - Omadacycline and eravacycline are new tetracycline antibiotics being used against Gram-negative bacteria, but resistance has been reported due to tetracycline-inactivating enzymes.
  • - A resistance strain with the mobile tigecycline resistance gene (X4) was isolated from a patient in Zhejiang, China, showing high resistance levels to eravacycline and omadacycline.
  • - The study emphasizes the role of the (X4) gene on a plasmid in contributing to antibiotic resistance and highlights the need for ongoing monitoring to control its spread in China.
View Article and Find Full Text PDF

This study aimed to investigate the epidemiological characteristics and trends over time of carbapenemase-producing (e.g., KPC, NDM, VIM, IMP, and OXA-48) Gram-negative bacteria (CPGNB).

View Article and Find Full Text PDF
Article Synopsis
  • Dendrobium spp. is a herb that has both medicinal and nutritional benefits, and a new method using UPLC-MS/MS was developed to measure six active compounds in it.
  • The extraction process involved using methanol at 60°C, achieving accurate results with a linear relationship for the compounds tested and good recovery rates.
  • The study highlights differences in compound composition between different Dendrobium species, providing important data for regulating the quality and safety of these herbs.
View Article and Find Full Text PDF

Rac1 is a key regulator of the cytoskeleton and neuronal plasticity, and is known to play a critical role in psychological and cognitive brain disorders. To elucidate the engram specific Rac1 signaling in fear memory, a doxycycline (Dox)-dependent robust activity marking (RAM) system was used to label dorsal dentate gyrus (DG) engram cells in mice during contextual fear conditioning. Rac1 mRNA and protein levels in DG engram cells were peaked at 24 h (day 1) after fear conditioning and were more abundant in the fear engram cells than in the non-engram cells.

View Article and Find Full Text PDF

Background: Multi-drug-resistant organisms (MDROs) in gram-negative bacteria have caused a global epidemic, especially the bacterial resistance to carbapenem agents. Plasmid is the common vehicle for carrying antimicrobial resistance genes (ARGs), and the transmission of plasmids is also one of the important reasons for the emergence of MDROs. Different incompatibility group plasmid replicons are highly correlated with the acquisition, dissemination, and evolution of resistance genes.

View Article and Find Full Text PDF

Background: Cutaneous malignant melanoma (CMM) causes most skin cancer deaths in the United States (US). The mortality has been decreasing in the US population. We hypothesize that this population-level reduction is mainly attributable to the treatment advances, rather than the successful primary and secondary prevention.

View Article and Find Full Text PDF

Purpose: To explore the genetic characteristics of the IMP-4, NDM-1, OXA-1, and KPC-2 co-producing multidrug-resistant (MDR) clinical isolate, wang9.

Methods: MALDI-TOF MS was used for species identification. PCR and Sanger sequencing analysis were used to identify resistance genes.

View Article and Find Full Text PDF

Background: Despite the global prevalence of Klebsiella pneumoniae Carbapenemase (KPC)-type class A β-lactamases, occurrences of KPC-3-producing isolates in China remain infrequent. This study aims to explore the emergence, antibiotic resistance profiles, and plasmid characteristics of bla-carrying Pseudomonas aeruginosa.

Methods: Species identification was performed by MALDI-TOF-MS, and antimicrobial resistance genes (ARGs) were identified by polymerase chain reaction (PCR).

View Article and Find Full Text PDF

Purpose: The frequent and inappropriate use of antibiotics has caused a dramatic rise in the number, species, and degree of multi-drug resistant bacteria, making them more prevalent and difficult to treat. In this context, the aim of the present study was to characterize the OXA-484-producing strains isolated from a perianal swab of a patient by using whole-genome analysis.

Patients And Methods: In this study, carbapenemase-producing was identified by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS), average nucleotide identity (ANI) and PCR.

View Article and Find Full Text PDF

Photocatalytic technology is considered an ideal approach for clean energy conversion and environmental pollution applications. In this work, a bifunctional BiOBr/ZIF-8/ZnO photocatalyst was proposed for removing phenols in wastewater and generating hydrogen peroxide. Insights from scanning electron microscopy measurements revealed the well-dispersion of ZIF-8/ZnO was on the BiOBr layer, which could effectively prevent agglomeration of ZIF-8 and facilitate the separation of carriers.

View Article and Find Full Text PDF

Purpose: To explore the genetic characteristics of the IMP-4 and SFO-1 co-producing multidrug-resistant (MDR) clinical isolates, YQ13422hy and YQ13530hy.

Methods: MALDI-TOF MS was used for species identification. Antibiotic resistance genes (ARGs) were tested by PCR and Sanger sequencing analysis.

View Article and Find Full Text PDF

The worldwide spread of carbapenem-resistant Enterobacteriaceae (CRE) has led to a major challenge to human health. In this case, colistin is often used to treat the infection caused by CRE. However, the coexistence of genes conferring resistance to carbapenem and colistin is of great concern.

View Article and Find Full Text PDF

IncX3 plasmids are narrow host range plasmids mostly found in with great conjugation ability, high stability, no fitness cost, and the ability to improve biofilm formation in their bacterial hosts. IncX3 plasmids have spread swiftly, primarily in several nations and among different species over the last 10 years. , , and are the carbapenemase genes carried by IncX3 plasmids.

View Article and Find Full Text PDF

Ethnopharmacological Relevance: The rhizome of Pinellia ternata (Thunb.) Breit, called Pinelliae Rhizoma (PR) and Banxia in Chinese, is a well-known traditional Chinese medicine (TCM) with the functions of "removing dampness-phlegm" and "downbear counterflow and check vomiting". PR has potential toxic effects that can be detoxified by Fuzhi processing (repeated processing using one or multiple adjuvants) with specific adjuvants.

View Article and Find Full Text PDF

Introduction: Paediatric tonsillar hyperplasia (TH) is associated with a spectrum of presentations ranging from recurrent tonsillitis (RT) to sleep-disordered breathing (SDB). The underlying pathogenesis of tonsillar hyperplasia remains poorly understood. Previous studies have implicated bacterial microcolonies as targets of host inflammatory cells and as a potential driver of the chronic inflammation seen in TH.

View Article and Find Full Text PDF

Introduction: Neuropathic pain is one of the common complications of spinal cord injuries (SCI), which will slow down the recovery process and result in lower quality of life. Previous studies have shown that repeated transcranial magnetic stimulation (rTMS) of the motor cortex (M1) can reduce the average pain and the most severe pain of neuropathic pain after SCI. The dorsolateral prefrontal cortex (DLPFC) area is a common target of rTMS.

View Article and Find Full Text PDF

Background And Aims: The incidence of HCC has recently been consistently reported to decline in the United States. However, decreased overall mortality of HCC has just been suggested and needs further examination.

Approach And Results: Using data from the Surveillance, Epidemiology, and End Results databases, we assessed HCC incidence, incidence-based mortality (IBM), and 1-year survival rates from 1992 through 2017 in the United States.

View Article and Find Full Text PDF

Currently, there is a need to explore the effects of different types of protein-anthocyanin complexations, as well as the possible changes in the nutrition and allergenicity of the formed complexes. Here, we systematically investigated the covalent and non-covalent interactions between cyanidin-3--glucoside (C3G) and two major milk proteins, α-casein (α-CN) and β-lactoglobulin (β-LG). Fluorescence quenching data showed that, under non-covalent conditions, C3G quenched the fluorescence of the two proteins a static process, with the interaction forces being revealed; for covalent products, decreased fluorescence intensities were observed with red shifts in the .

View Article and Find Full Text PDF

Background: Virtual reality (VR) training are regarded as promising new tools for rehabilitation, but the effect on patients' daily participation is controversial. This study aimed to evaluate the effect of virtual reality (VR) training on different types of patients' daily participation through a meta-analysis.

Methods: The PubMed, Cochrane central register of controlled trials, Embase, and web science databases were searched for studies published through September 2020.

View Article and Find Full Text PDF

Background: Clinical research on the rotator cuff tendon is increasing, and new approaches are being applied to rotator cuff disease. Considering the integration of research resources and research trends, it is necessary to conduct an analysis of recent research on the topic.

Purpose: To identity the research trends, influential journals, key researchers, and core countries of rotator cuff tendon research between 2000 and 2019.

View Article and Find Full Text PDF