Evaluation of strategies for preservation of microalgae Chlorella

[EN] The biomass obtained from microalgae, such as Chlorella, is used to make dietary products, supplements and pharmaceuticals. However, microalgae are produced very far from consumption places. One of the most usual distribution forms is as a dry product, a process that entails high production costs and leads to the loss of certain nutritional properties. Therefore, the aim of this study was to evaluate alternative preservation strategies for microalgae Chlorella other than dehydration and freezing. To that end, sterilization, acidification, and packaging material were analyzed during 2 months of storage under different temperature and light exposure conditions. The results showed that color was modified considerably by sterilization, regardless of light exposure and type of package, whereas citric acid preserved color, especially at low storage temperatures. Furthermore, the study shows that acidification with 3.5% of citric acid and vacuum packaging are the recommended treatment for microalgae, without the need for cold storage. Practical applicationsStabilization of microalgae Chlorella from production to consumption places could increase the possibilities of commercialization of this product, recently labeled superfood by the UN Food and Agriculture Organization. In order to preserve all their nutritional properties for at least 2 months, acidification with 3.5% of citric acid and vacuum packaging are the recommended treatments, without the need for cold storage.The review of this paper was funded by the Universitat Politècnica de València, SpainCastelló Gómez, ML.; Pariente, G.; Andrés Grau, AM.; Ortolá Ortolá, MD. (2017). Evaluation of strategies for preservation of microalgae Chlorella. Journal of Food Processing and Preservation. 42(2):1-8. doi:10.1111/jfpp.13518S1842

Wild Boar Tissue Levels of Cadmium, Lead and Mercury in Seven Regions of Continental Croatia

Concentrations of cadmium, mercury and lead were analysed by atomic absorption spectrometry in the kidney and muscle of free-living wild boar (n = 169) from hunting grounds in seven counties of continental Croatia. Mean levels of metals (mg/kg) in muscle and kidney of boars ranged as follows: Cd: 0.005–0.016 and 0.866–4.58, Pb: 0.033–0.15 and 0.036–0.441, Hg: 0.004–0.012 and 0.04–0.152. In all seven regions, concentrations exceeded the permitted values (muscle and kidney mg/kg: cadmium 0.05/1; lead 0.1/0.5; mercury 0.03/0.1) in 13.6% and 71.6% of samples (muscle and kidney, respectively) for cadmium; 13.6% and 8.9% for lead; 19.5% and 2.4% for mercury. There were significant differences among the regions. Vukovar-Srijem and Virovitica-Podravina Counties were highly contaminated with cadmium, Sisak-Moslavina and Virovitica-Podravina Counties with lead and Brod-Posavina County had highest mercury concentrations. These results suggest a detailed investigation of physiological and environmental factors contributing to accumulation of metals in boars

Identifying non-destructive growth and maturity indexes of Prickly pear (Opuntia albicarpa S. Var. Burrona) and evaluation of freeze-drying conditions

Around the world, prickly pear fruits are valued as a source of dietary functional compounds and ingredients for innovative foods. Growth and physicochemical changes of Opuntia albicarpa S. fruits were recorded from 0 to 132 days-after-flowering (DAF) to identify non-destructive maturity-indices. Optimum-ripened fruits were freeze-dried to study physicochemical and functional characteristics of dried and rehydrated pulp. Principal component analysis confirmed growth turned into fruit ripening in DAF 99, and it lasted until DAF 132. Changes in color parameters of the peel correlated with fruit texture and pulp sugar content and taste index (P < 0.01). During freeze-drying, plate temperature had more significant effects than the thickness (P < 0.05). At 30°C, color ΔE between dried and fresh slices augmented, but, texture Δ´s (medium force) between rehydrated and fresh pulp was lower. Color tests could be used to harvest commercially-ripened fruits. Freeze-drying at 30°C improves the rehydrated slices texture regarding thickness maintaining rehydration coefficients.Las tunas son apreciadas en todo el mundo como fuente de compuestos funcionales dietarios e ingredientes para alimentos innovadores. Para identificar índices de maduración no destructivos, se registraron cambios en el crecimiento y en los parámetros fisicoquímicos de frutos de Opuntia albicarpa S. entre los días después de la floración (DAF) 0 al 132. Frutos con maduración óptima fueron liofilizados para evaluar características fisicoquímicas y funcionales de pulpa seca y rehidratada. El análisis de componentes principales confirmo que el crecimiento dio lugar a la maduración en el DAF 99 y ésta prosiguió hasta el DAF 132. Los cambios en parámetros de color en cáscara correlacionaron con la textura del fruto, y en pulpa, con el contenido de azúcares y el índice de sabor (P< 0.01). Durante la liofilización, la temperatura de placa tiene más efectos significativos que el espesor (P≤ 0.05). A 30°C, el ΔE de color entre la pulpa seca y fresca aumentó, pero, el Δ de textura (fuerza media) fue menor entre la rehidratada y la fresca. Se pueden emplear evaluaciones de color para cosechar frutos en su madurez comercial, y liofilizar estos frutos a 30°C mejora la textura sin importar el espesor, manteniendo los coeficientes de rehidratación.This work was supported by the SIMORELOS program of CONACyT

Increasing Seed Viability of Maize Haploid Inducing Lines by Genetic and Non-Genetic Approaches

Some haploid inducing lines used in the production of maize doubled haploids (DHs), express germination problems and reduced vigor. In this study, haploid inducing lines RWS, RWK-76 and their reciprocal hybrids RWS/RWK-76 and RWK-76/RWS were examined for viability by Tetrazolium (TZ) and germination ability by standard germination tests. Evaluation based on TZ tests showed that 59% of the seed of RWK-76/RWS were not viable, compared with only 12% dead seed in RWS/RWK-76. Similarly, the percentage and speed of germination in RWK- 76/RWS (25%, 1.53) was lower than for RWS/RWK-76 (74%, 4.30). In an effort to develop a quick method for assessing seed viability in these lines, the TZ test was repeated in a different way. Seed from each genotype was placed in beakers containing distilled water.Seed would either float or sink. Subsequent TZ testing confirmed that seed that floated was dead, and seed that sank was alive, although some of them had defective embryos. The dead seed in both genotypes failed to develop an embryo, leaving an empty cavity that would fill with air and cause seed to float on water. This feature can be exploited for a simple and practical method to separate living from dead seed. In addition, we surveyed theig1 (indeterminate gametophyte) gene as a candidate for germination problems in inducer lines.Sequencing data from theig1 region showed that RWS and RWK-76 differed in one nucleotide and amino acidin the firstexon of ig1.Segregation of ig1 alleles from RWS and RWK-76 wassignificantly (P=0.01) distortedin the respectiveF2 population relative to the expected Mendelian segregation ratio (1:2:1). Thus, either ig1 or a linked gene in the ig1 region affect seed viability

Living on social assistance with chronic illness: Buffering and undermining features to well-being

<p>Abstract</p> <p>Background</p> <p>In Sweden, the social security and sickness insurance systems are comprehensive and aim to provide people whose illness prevents them from earning their own living, with either sickness benefits or disability pension. Some, however, are not entitled to these benefits or receive social insurance benefits at a level too low for subsistence, and are referred to social assistance. The purpose of this study was to explore in depth how social assistance recipients with chronic illness perceive and respond to the experience of living on social assistance.</p> <p>Methods</p> <p>Seventeen in-depth interviews were carried out with chronically ill people who had received social assistance for several years. Grounded theory informed the design of the study.</p> <p>Results</p> <p>The study showed that different strategies (living one day at a time, taking steps forwards and backwards and making attempts to find ways out of the situation) were employed by social assistance recipients to maintain or improve their well-being. Contextual features like the prevailing welfare system, public services and the local neighbourhood could buffer or undermine these strategies and their overall well-being. These features together influenced how interviewees perceived their situation, the possible ways out of the situation and the consequences for their well-being.</p> <p>Conclusion</p> <p>From this study it is evident that the way in which individuals on social assistance interact with services and how they are treated by professionals plays an important role in their well-being, in combination with what kind of help and support is available for recipients through the welfare system. In this respect, persons living on social assistance with chronic illness are particularly vulnerable. This study suggests that more effort should be made to find long term solutions concerning income support, rehabilitation and other services provided to this group.</p

Kinned to be Norwegian : transnational adoptees' positioning in relation to whiteness and the negotiation of nationhood

Author's accepted version (postprint).This is an Accepted Manuscript of an article published by John Wiley & Sons Ltd in Nations and Nationalism on 13 April 2019.Available online: https://onlinelibrary.wiley.com/doi/full/10.1111/nana.12525acceptedVersio

The macronutrient composition of wild and cultivated plant foods of West African chimpanzees (Pan troglodytes verus ) inhabiting an anthropogenic landscape

Agricultural expansion encroaches on tropical forests and primates in such landscapes frequently incorporate crops into their diet. Understanding the nutritional drivers behind crop‐foraging can help inform conservation efforts to improve human‐primate coexistence. This study builds on existing knowledge of primate diets in anthropogenic landscapes by estimating the macronutrient content of 24 wild and 11 cultivated foods (90.5% of food intake) consumed by chimpanzees (Pan troglodytes verus) at Bossou, Guinea, West Africa. We also compared the macronutrient composition of Bossou crops to published macronutrient measures of crops from Bulindi, Uganda, East Africa. The composition of wild fruits, leaves, and pith were consistent with previous reports for primate diets. Cultivated fruits were higher in carbohydrates and lower in insoluble fiber than wild fruits, while wild fruits were higher in protein. Macronutrient content of cultivated pith fell within the ranges of consumed wild pith. Oil palm food parts were relatively rich in carbohydrates, protein, lipids, and/or fermentable fiber, adding support for the nutritional importance of the oil palm for West African chimpanzees. We found no differences in the composition of cultivated fruits between Bossou and Bulindi, suggesting that macronutrient content alone does not explain differences in crop selection. Our results build on the current understanding of chimpanzee feeding ecology within forest‐agricultural mosaics and provide additional support for the assumption that crops offer primates energetic benefits over wild foods