[Barriers and facilitators to physical activity in oncology in Seine-Saint-Denis: A qualitative study using the socio-ecological approach]. / Barrières et facilitateurs à l'activité physique en oncologie en Seine-Saint-Denis : étude qualitative selon l'approche socio-écologique.

INTRODUCTION: Despite the undeniable benefits of physical activity during and beyond cancer treatments, patients do not always undertake and/or maintain it. The aim of the study is to identify, describe and understand the barriers and facilitators of physical activity practice among adults arriving at the end of treatment for solid cancer, in precarious situations, living in Seine-Saint-Denis. METHODS: The study was conducted using a descriptive qualitative phenomenological method involving semi-directed interviews with 23 participants during and beyond cancer. RESULTS: Multiple-level factors (micro, meso, macro) are involved in active behavior of patients. Three main facilitators were identified: perceived benefit, social support, and urban planning. Three barriers are identified: (1) physical and psychological disorders whether or not related to cancer and its treatment, (2) precariousness, organizational constraints, unfavorable social environment, (3) lack of coordination, lack of accurate and appropriate information, lack of realistic referral to physical activity offers. DISCUSSION: A diversity of representations, combinations of factors, and experiences are described. Getting people with cancer to engage in and maintain long-term physical activity is a complex task, requiring multidisciplinary action on all socio-ecological factors.

Degradation of tyrosol by a novel electro-Fenton process using pyrite as heterogeneous source of iron catalyst.

Tyrosol (TY) is one of the most abundant phenolic components of olive oil mill wastewaters. Here, the degradation of synthetic aqueous solutions of 0.30 mM TY was studied by a novel heterogeneous electro-Fenton (EF) process, so-called EF-pyrite, in which pyrite powder was the source of Fe(2+) catalyst instead of a soluble iron salt used in classical EF. Experiments were performed with a cell equipped with a boron-doped diamond anode and a carbon-felt cathode, where TY and its products were destroyed by hydroxyl radicals formed at the anode surface from water oxidation and in the bulk from Fenton's reaction between Fe(2+) and H2O2 generated at the cathode. Addition of 1.0 g L(-1) pyrite provided an easily adjustable pH to 3.0 and an appropriate 0.20 mM Fe(2+) to optimize the EF-pyrite treatment. The effect of current on mineralization rate, mineralization current efficiency and specific energy consumption was examined under comparable EF and EF-pyrite conditions. The performance of EF-pyrite was 8.6% superior at 50 mA due to self-regulation of soluble Fe(2+) by pyrite. The TY decay in this process followed a pseudo-first-order kinetics. The absolute rate constant for TY hydroxylation was 3.57 × 10(9) M(-1) s(-1), as determined by the competition kinetics method. Aromatic products like 3,4-dihydroxyphenylethanol, 4-hydroxyphenylacetic acid, 4-hydroxybenzoic acid, 3,4-dihydroxybenzoic acid and catechol, as well as o-benzoquinone, were identified by GC-MS and reversed-phase HPLC. Short-chain aliphatic carboxylic acids like maleic, glycolic, acetic, oxalic and formic were quantified by ion-exclusion HPLC. Oxalic acid was the major and most persistent product found. Based on detected intermediates, a plausible mineralization pathway for TY by EF-pyrite was proposed.