Arabinoxylan in Water through SANS: Single-Chain Conformation, Chain Overlap, and Clustering.

Using small-angle neutron scattering (SANS), we examine the structure and conformational behavior of wheat arabinoxylan (AX) prepared at various concentrations in a sodium phosphate aqueous buffer. As for another major hemicellulose, xyloglucan, we observe a small number of large clusters surrounded by AX chains that behave exactly as a polymer in good solvent with a Flory exponent ν = 0.588. The fit of the data at high q-values to a standard worm-like chain model gives the persistence length lp = 45 Å and cross section of the chains 2Rc = 11-12 Å. In addition, using a dedicated modeling approach, we extract from the SANS data at the intermediate q-range the correlation length ξ of the solutions in the semidilute regime. The decay of ξ with concentration follows a scaling law that further confirms the self-avoiding statistical behavior of the AX chains. This first comprehensive study about the properties of water-soluble AX at different length scales may help in the development of products and processes involving AX as a substitute for fossil carbon molecules.

Micropollutants removal in tertiary moving bed biofilm reactors (MBBRs): Contribution of the biofilm and suspended biomass.

The performance of tertiary moving bed biofilm reactors (MBBRs) was evaluated in terms of micropollutants (MPs) removal from secondary-treated municipal wastewater. After stepwise establishment of a mature biofilm, monitored by scanning electron and confocal microscopies, abiotic and biotic removals of MPs were deeply studied. Since no MPs reduction was observed by the both photodegradation and volatilization, abiotic removal of MPs was ascribed to the sorption onto the biomass. Target MPs i.e. Naproxen, Diclofenac, 17ß-Estradiol and 4n-Nonylphenol, arranged in the ascending order of hydrophobicity, abiotically declined up to 2.8%, 4%, 9.5% and 15%, respectively. MPs sorption onto the suspended biomass was found around two times more than the biofilm, in line with MPs' higher sorption kinetic constants (ksor) found for the suspended biomass. When comparing abiotic and biotic aspects, we found that biotic removal outperformed its counterpart for all compounds as Diclofenac, Naproxen, 17ß-Estradiol and 4n-Nonylphenol were biodegraded by 72.8, 80.6, 84.7 and 84.4%, respectively. The effect of the changes in organic loading rates (OLRs) was investigated on the pseudo-first order degradation constants (kbiol), revealing the dominant biodegradation mechanism of co-metabolism for the removal of Diclofenac, Naproxen, and 4n-Nonylphenol, while 17ß-Estradiol obeyed the biodegradation mechanism of competitive inhibition. Biotic removals and kbiol values of all MPs were also seen higher in the biofilm as compared to the suspended biomass. To draw a conclusion, a quite high removal of recalcitrant MPs is achievable in tertiary MBBRs, making them a promising technology that supports both pathways of co-metabolism and competitive inhibition, next to the abiotic attenuation of MPs.

Predicting outcome of inpatient CBT for adolescents with anxious-depressed school absenteeism.

Predictors of outcome of inpatient treatment based on manualized cognitive-behavioural therapy (CBT) were examined for 147 adolescents with anxious-depressed school absenteeism assessed at discharge and at 2 months after the end of treatment. Outcome measures were regular school attendance and a wide variety of mental health problems rated by adolescents and parents. Socio-demographic data, clinical ratings/diagnosis and adolescent-reported and parent-reported mental health problems were examined as predictors. Regression analyses indicated that none of the variables were able to predict regular school attendance in a clinically relevant way. Adolescent-reported and parent-reported mental health problems at intake predicted these symptoms at both discharge and follow-up (R(2) between 0.31 and 0.61).

Short term effects of inpatient cognitive behavioral treatment of adolescents with anxious-depressed school absenteeism: an observational study.

This observational study examined the changes during inpatient cognitive-behavioral treatment (CBT) of adolescents with chronic anxious-depressive school absenteeism with or without comorbid disruptive symptoms. 147 adolescents (aged 12-18 years) with a specific phobia or other anxiety disorder or a depressive episode or a mixed disorder of conduct and emotions and who had completely ceased to attend school or showed irregular school attendance underwent an inpatient cognitive-behavioral treatment. A further 16 patients aborted the treatment during the first day and were not included in the analyses. The treatment was manual guided and also included parents. Assessments were made pre-inpatient treatment, immediately post-inpatient treatment and at 2-month follow-up. School attendance was the primary outcome variable and secondary outcomes were composite scores of a range of adolescent- and parent-rated mental health problems. Overall, results show a considerable decline of school absenteeism and mental health problems during treatment and subsequent follow-up. Continuous school attendance was achieved by 87.1% of the sample at the end of inpatient treatment and by 82.3% at 2-month follow-up. Comorbid symptoms of anxiety, depression, disruptive and insufficient learning behavior were significantly reduced from pre to follow-up, with effect sizes for the composite scores ranging from 0.44 to 1.15 (p < 0.001). This large observational study in adolescents with school absenteeism and a mixture of emotional and disruptive symptoms is the first to show the benefits of inpatient therapy that included cognitive-behavioral therapy and access to a special school with expertise on teaching children and adolescents with psychiatric disorders. The results must be interpreted conservatively because of the lack of a control condition.