Culturally sensitive active ageing seen through the lens of the welfare theory of health: assistant nurses' views.

Assistant nurses caring for older adults with immigrant backgrounds are on the front lines of a practical, theoretical, and policy battlefield. They need to implement culturally sensitive care provision while not overstating the importance of culture, thereby, contributing to a negative picture of older immigrants as especially problematic. One proposed way to strike such a balance is the welfare theory of health (WTH). In this article, we let assistant nurses apply the WTH to a series of questions in four different vignettes representing the life stories of older persons who characterize typical dilemmas described by the theory. The results show that, through the lens of the WTH, assistant nurses looked for individual care preferences rather than stereotypical ideas about cultural characteristics. Further, the assistant nurses expressed a desire to get to know the persons more deeply to better interpret and understand their individual preferences. Thus, the theoretical framework is useful not only for exposing vulnerabilities to which some older adults with immigrant backgrounds may be exposed, but also for finding ways to mitigate the vulnerability by illuminating vital life goals and using them as a framework to organize care. This approach allows for mitigating the gap between the vital life goals and available resources to achieve a holistic state of health.

Continuous fermentation of wheat-supplemented lignocellulose hydrolysate with different types of cell retention.

Medium supplementation and process alternatives for fuel ethanol production from dilute acid lignocellulose hydrolysate were investigated. Dilute acid lignocellulose hydrolysate supplemented with enzymatically hydrolysed wheat flour could sustain continuous anaerobic cultivation of Saccharomyces cerevisiae ATCC 96581 if further supplemented with ammonium sulphate and biotin. This medium composition allowed for a hexose utilisation of 73% and an ethanol production of 36 mmol l(-1) h(-1) in chemostat cultivation at dilution rate 0.10 h(-1). Three different methods for cell retention were compared for improved fermentation of supplemented lignocellulose hydrolysate: cell recirculation by filtration, cell recirculation by sedimentation and cell immobilisation in calcium alginate. All three cell retention methods improved the hexose conversion and increased the volumetric ethanol production rate. Recirculation of 75% of the bioreactor outlet flow by filtration improved the hexose utilisation from 76% to 94%. Sedimentation turned out to be an efficient method for cell separation; the cell concentration in the reactor was 32 times higher than in the outflow after 60 h of substrate feeding. However, chemostat and continuous cell recirculation cultures became severely inhibited when the dilution rate was increased to 0.20 h(-1). In contrast, an immobilised system kept producing ethanol at a stable level also at dilution rate 0.30 h(-1).

Continuous fermentation of undetoxified dilute acid lignocellulose hydrolysate by Saccharomyces cerevisiae ATCC 96581 using cell recirculation.

Saccharomyces cerevisiae ATCC 96581 was cultivated in a chemostat reactor with undetoxified dilute acid softwood hydrolysate as the only carbon and energy source. The effects of nutrient addition, dilution rate, cell recirculation, and microaerobicity were investigated. Fermentation of unsupplemented dilute acid lignocellulose hydrolysate at D = 0.10 h(-1) in an anaerobic continuous reactor led to washout. Addition of ammonium sulfate or yeast extract was insufficient for obtaining steady state. In contrast, dilute acid lignocellulose hydrolysate supplemented with complete mineral medium, except for the carbon and energy source, was fermentable under anaerobic steady-state conditions at dilution rates up to 0.14 h(-1). Under these conditions, washout occurred at D = 0.15 h(-1). This was preceded by a drop in fermentative capacity and a very high specific ethanol production rate. Growth at all different dilution rates tested resulted in residual sugar in the chemostat. Cell recirculation (90%), achieved by cross-flow filtration, increased the sugar conversion rate from 92% to 99% at D = 0.10 h(-1). Nutrient addition clearly improved the long-term ethanol productivity in the recirculation cultures. Application of microaerobic conditions on the nutrient-supplemented recirculation cultures resulted in a higher production of biomass, a higher cellular protein content, and improved fermentative capacity, which further improves the robustness of fermentation of undetoxified lignocellulose hydrolysate.