Genome-scale metabolic modeling of the human milk oligosaccharide utilization by Bifidobacterium longum subsp. infantis.

Bifidobacterium longum subsp. infantis is a representative and dominant species in the infant gut and is considered a beneficial microbe. This organism displays multiple adaptations to thrive in the infant gut, regarded as a model for human milk oligosaccharides (HMOs) utilization. These carbohydrates are abundant in breast milk and include different molecules based on lactose. They contain fucose, sialic acid, and N-acetylglucosamine. Bifidobacterium metabolism is complex, and a systems view of relevant metabolic pathways and exchange metabolites during HMO consumption is missing. To address this limitation, a refined genome-scale network reconstruction of this bacterium is presented using a previous reconstruction of B. infantis ATCC 15967 as a template. The latter was expanded based on an extensive revision of genome annotations, current literature, and transcriptomic data integration. The metabolic reconstruction (iLR578) accounted for 578 genes, 1,047 reactions, and 924 metabolites. Starting from this reconstruction, we built context-specific genome-scale metabolic models using RNA-seq data from cultures growing in lactose and three HMOs. The models revealed notable differences in HMO metabolism depending on the functional characteristics of the substrates. Particularly, fucosyl-lactose showed a divergent metabolism due to a fucose moiety. High yields of lactate and acetate were predicted under growth rate maximization in all conditions, whereas formate, ethanol, and 1,2-propanediol were substantially lower. Similar results were also obtained under near-optimal growth on each substrate when varying the empirically observed acetate-to-lactate production ratio. Model predictions displayed reasonable agreement between central carbon metabolism fluxes and expression data across all conditions. Flux coupling analysis revealed additional connections between succinate exchange and arginine and sulfate metabolism and a strong coupling between central carbon reactions and adenine metabolism. More importantly, specific networks of coupled reactions under each carbon source were derived and analyzed. Overall, the presented network reconstruction constitutes a valuable platform for probing the metabolism of this prominent infant gut bifidobacteria.IMPORTANCEThis work presents a detailed reconstruction of the metabolism of Bifidobacterium longum subsp. infantis, a prominent member of the infant gut microbiome, providing a systems view of its metabolism of human milk oligosaccharides.

Occupational balance of Spanish occupational therapists - a challenge.

BACKGROUND: Occupational balance is a central aspect in occupational therapy. Awareness of occupational balance/imbalance among occupational therapists could influence the orientation of their professional interventions. OBJECTIVE: To describe and compare the occupational balance status of occupational therapists working in Spain. MATERIAL AND METHODS: Cross-sectional descriptive study using an online questionnaire. Participants were occupational therapists working in Spain who answered a questionnaire including 22 questions on the sociodemographic and employment data and the Spanish version of the Occupational Balance Questionnaire (OBQ-E) ranging 0-65 where higher ratings equal better occupational balance. RESULTS: A total of 648 currently working occupational therapists participated. Mostly women, with median age of 32 years, without partner, children, or dependents. The median OBQ-E was 37 (IQR = 27; 45). Statistically significant differences were found between the medians of participants varying in the categories 'hired as an occupational therapist', weekly work hours, and population working with children and adults. CONCLUSIONS AND SIGNIFICANCE: Spanish occupational therapists presented a moderate occupational balance that varied between subgroups. Professional recognition, working hours, and the population they attend are aspects that influence their occupational balance. Knowledge of occupational therapists' occupational balance could contribute to the development of policies aimed at promoting it.

[Interventions based on exercise and physical environment for preventing falls in cognitively impaired older people living in long-term care facilities: A systematic review and meta-analysis]. / Intervenciones basadas en el ejercicio y el entorno para la prevención de caídas en personas con deterioro cognitivo que viven en centros de cuidado: revisión sistemática y metaanálisis.

This systematic review aims to report the effectiveness of interventions based on exercise and/or physical environment for reducing falls in cognitively impaired older adults living in long-term care facilities. In July 2014, a literature search was conducted using main databases and specialised sources. Randomised controlled trials assessing the effectiveness of fall prevention interventions, which used exercise or physical environment among elderly people with cognitive impairment living in long-term care facilities, were selected. Two independent reviewers checked the eligibility of the studies, and evaluated their methodological quality. If it was adequate, data were gathered. Fourteen studies with 3,539 participants using exercise and/or physical environment by a single or combined approach were included. The data gathered from studies that used both interventions showed a significant reduction in fall rate. Further research is needed to demonstrate the effectiveness of those interventions for preventing falls in the elderly with cognitive impairment living in long-term care establishments.