The combined impact of temperature and light spectra on the fatty acid (FA) composition in microalgae has been sparsely investigated. The aim of this study was to investigate the interactions of light and temperature on the FA composition in Acutodesmus obliquus. For this purpose, A. obliquus was cultivated with different temperatures (20, 30, and 35 C), as well as broad light spectra (blue, green, and red light). Growth and FA composition were monitored daily. Microalgal FA were extracted, and a qualitative characterization was done by gas chromatography coupled with electron impact ionization mass spectrometry (GC-EI/MS). Compared to red light, green and blue light caused a higher percentage of the polyunsaturated fatty acids (PUFA) 16:4, 18:3, and 18:4, at all temperatures. The highest total percentage of these PUFA were observed at the lowest cultivation temperature and blue and green light. These data imply that a combination of lower temperatures and blue-green light (450-550 nm) positively influences the activity of specific FA-desaturases in A. obliquus. Additionally, a lower 16:1 trans/cis ratio was observed upon green and blue light treatment and lower cultivation temperatures. Remarkably, green light treatment resulted in a comparably high growth under all tested conditions. Therefore, a higher content of green light, compared to blue light might additionally lead to a higher biomass concentration. Microalgae cultivation with low temperatures and green light might therefore result in a suitable FA composition for the food industry and a comparably high biomass production.
Holiday travel offers the opportunity for self-definition and enhancement of social prestige. Due to the growing importance of self-expressive values within the ongoing course of individualisation, tourists increasingly make use of their travel experience to self-present in a positive way. Yet, tourism studies have not investigated what tourists actually want to communicate about themselves when representing their travel experience through the display of souvenirs. Using semi-structured qualitative interviews, this study examines touristic self-expression and exposes the self-concepts attached to and communicated through the display of souvenirs as material symbols of travel experience. Results show that tourists often have a clear intention to express positive self-messages when showing their souvenirs to others. Souvenirs are used to represent personal character traits, social affiliation to in-groups and neo-tribes, and to demonstrate individual travel history. This article adds to the discussion of individual ascription of meaning to the tourist experience and souvenirs, and gives an insight to the function of souvenirs for self-expression and social exchange.
Purpose Leisure travel has long been seen as a means of conspicuous consumption in pursuance of personal prestige; yet, there is no empirical evidence that travel affects personal prestige of tourists. The aims of this study are to develop a scale measuring personal prestige and to experimentally test prestige evaluations based on amount of leisure information, tourism participation and different types of leisure. Design/methodology/approach In an experimental online survey, 477 respondents were presented with a manipulated social media profile and asked to evaluate personal prestige of the person on the profile. Findings Results present evidence that representation of travel experience has a positive effect on personal prestige evaluations of tourists. The authors found significant differences in personal prestige depending on experimental variations. Originality/value This study advances methodological approaches towards the study of tourists’ prestige by providing a reliable, multidimensional measurement scale for personal prestige. The findings yielded by subsequent application of the scale in an experimental setting provide empirical evidence that sharing travel experiences has measurable and experimentally testable personal prestige benefits for tourists.
Purpose The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) pandemic has drastically affected the public discourse on tourism in news reporting and on social media, potentially changing social perceptions of travel and its utility for conspicuous consumption. Prestige enhancement is a common tourist motivation, yet, as tourists have been portrayed as irresponsible and even dangerous during the pandemic, the benefits of travel for personal prestige may have been affected. The purpose of this study is to monitor changes in tourists’ personal prestige during the early pandemic in 2020. Design/methodology/approach The authors developed an innovative study design implicitly measuring the personal prestige of tourists shown on experimentally manipulated social media posts. Three measurement waves were issued to compare the personal prestige of tourists just before, during and after the first lockdown situation in Germany. Findings Differences regarding evaluations of tourists’ prestige were found for prestige dimensions of hedonism, achievements, wealth and power, suggesting that prestige ascription to tourists has been affected by the changing discourse on leisure travel. Originality/value This study contributes to the discussion of the socio-psychological effects of the SARS-CoV-2 pandemic on customer benefits of leisure travel. It exposes possible impacts of the pandemic on tourisms’ value for conspicuous consumption and prestige enhancement.
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