In order to study the possible phenotypic and genotypic changes related to glycopeptide pressure on enterococci, a study was undertaken using stepwise in vitro exposure to achieve the following objectives: (i) to evaluate the development of resistance and cross-resistance between vancomycin and teicoplanin; (ii) to determine the stability of the acquired level of resistance; (iii) to determine the phenotypic and genotypic changes related to glycopeptide pressure; and (iv) to assess the spectrum of antibiotic-susceptibility of all strains. Our results showed that no variants resistant to glycopeptides could be selected after in vitro glycopeptide exposure experiments. However some strains showed increased MIC values: 8 mg/l to vancomycin in eight strains selected by vancomycin itself, while teicoplanin produced intermediate values to vancomycin in only three strains. The phenotypes were stable in vitro after numerous passages in antibiotic-free medium and three out of nine strains with a changed MIC level, showed 40, 42 and 43 kDa proteins in cell membrane preparations. The profile of antibiotic resistance was comparable in all isogenic strains tested with the exception of three selected strains that became susceptible to penicillin G. The pressure produced by glycopeptides, particularly vancomycin has contributed to an increased level of MIC that can influence the acquisition and/or full expression of this resistance.
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http://dx.doi.org/10.1016/s0924-8579(99)00082-5 | DOI Listing |
BMC Pediatr
January 2025
Department of Orthodontics, University Hospital Bonn, Medical Faculty, Welschnonnenstr. 17, 53111, Bonn, Germany.
Background: Children with non-syndromic cleft lip with or without palate (CL ± P) may present alterations in dental development. The purpose of this cross-sectional study was to compare the dental age (DA) between children with and without CL ± P, and whether single nucleotide polymorphisms (SNPs) in genes encoding growth factors are associated with DA variations.
Methods: Children aged between 5 and 14 years with and without CL ± P were recruited to participate in this study.
BMC Med Imaging
January 2025
Department of Radiology, Shenzhen Children's Hospital, Shantou University Medical College, 7019 Yitian Road, Futian District, Shenzhen, 518038, China.
Background: Beta thalassemia major (β-TM) is a severe genetic anemia with considerable phenotypic heterogeneity. This study investigated whether genotype correlates with distinct myocardial iron overload patterns, assessed by cardiovascular magnetic resonance (CMR) T2* values.
Methods: CMR data for cardiac iron deposition evaluation, which recruited pediatric participants between January 2021 and December 2024, were analyzed with CVI42.
PLoS One
January 2025
Wolaita Sodo University, Sodo, South Ethiopian Region, Ethiopia.
Smallholder wheat farmers of Ethiopia frequently use landraces as seed sources that are low yielders and susceptible to diseases due to shortage of seeds of adapted improved bread wheat varieties. Developing novel improved varieties with wider adaptability and stability is necessary to maximize the productivity of bread wheat. Hence, a multi-location field trial was conducted across four locations in south Ethiopia during the 2022/23 main cropping season with the objective of estimating the magnitude of genotype by environment interaction (GEI) effect, and determine the stable genotype among the 10 Ethiopian bread wheat advanced selections using a randomized complete block design (RCBD) with three replications.
View Article and Find Full Text PDFJ Hered
January 2025
Centro de Investigación de Estudios Avanzados del Maule, Universidad Católica del Maule, Avenida San Miguel 3605, Talca, Chile.
Mosquitoes from the Culex pipiens complex are found worldwide and have been the focus of numerous studies due to their role as vectors of human pathogens. We investigated the population genetic structure of Cx. pipiens s.
View Article and Find Full Text PDFCochrane Database Syst Rev
January 2025
Cornell Joan Klein Jacobs Center for Precision Nutrition and Health, Cornell University, Ithaca, NY, USA.
Background: Precision nutrition-based methods develop tailored interventions and/or recommendations accounting for determinants of intra- and inter-individual variation in response to the same diet, compared to current 'one-size-fits-all' population-level approaches. Determinants may include genetics, current dietary habits and eating patterns, circadian rhythms, health status, gut microbiome, socioeconomic and psychosocial characteristics, and physical activity. In this systematic review, we examined the evidence base for the effect of interventions based on precision nutrition approaches on overweight and obesity in children and adolescents to help inform future research and global guidelines.
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