•Intensity of social media usage is formed by updating news and searching for information.•The intensity affects the motives for receiving UGC in social media.•The motives for receiving UGC ...influences on trust in UGC and in UGC providers.•Potential tourists will generate trust in UGC, and then the expectations.•Trust in UGC providers does not have any influence on expectations.
Social media are transforming the tourism industry from its traditional pattern into an intense informational pattern. Our study aims to investigate the causes underlying the use of user-generated contents (UGC) to receive tourist information and its effect on tourists’ expectations. Our empirical work was analysed by means of a multiple indicators multiple causes model (MIMIC) and a structural equation model (SEM). The main finding showed that when users receive UGC related to tourist destinations, they will create expectations about the destination by placing their trust in the contents received. It is recommended that tourism organizations should maintain the quality level in order to allow more UGC, and then further trust in the contents of social media and expectations will occur.
The study focuses on sources of user-generated content (UGC) in social media: strong-tie sources, weak-tie sources, and tourism-tie sources and their effects on tourist satisfaction with the ...destination. It is separated into the pre- and post- travel processes. First, it addresses the influences of sources of UGC on tourist expectations about core resources and supporting factors, and then analyzes tourist satisfaction by concentrating on tourist expectations and perceptions of core resources and supporting factors. Findings suggest that UGC sources have an indirect effect on tourist satisfaction since most UGC sources have an influence on tourist expectations, which will later be compared with the real tourist perception. Main conclusions and some recommendations and limitations are provided.
Although economic inequality has increased over the last few decades, support for redistributive policies is not widely accepted by the public. In this paper, we examine whether attitudes towards ...redistribution are a product of both perceptions of, and beliefs about, inequality. Specifically, we argue that the association between perceived inequality and support for redistribution varies by beliefs that justify inequality. We investigated this hypothesis in a cross‐cultural/country sample (N = 56,021 from 41 countries) using two different operationalizations of support for redistribution and two distinct beliefs that justify inequality. As hypothesized, the perceived size of the income gap correlated positively with believing that it is the government's responsibility to reduce inequality among those who rejected beliefs that justify inequality, whereas there was no association for those who endorsed these beliefs. Similarly, perceived economic inequality correlated positively with support for progressive taxation, but this association was weaker among those who endorsed meritocratic and equal opportunity beliefs. Together, these results demonstrate that ideologies influence the relationship between perceived inequality and attitudes towards redistribution, and that support for redistribution varies by how the policy is framed.
We hereby present experimental and theoretical insights on the use of biomineralized magnetite nanoparticles, called magnetosomes, as heat nanoinductors in the magnetic hyperthermia technique. The ...heating efficiency or specific absorption rate of magnetosomes extracted from Magnetospirillum gryphiswaldense bacteria and immersed in water and agarose gel, was directly determined from the hysteresis loops obtained at different frequencies and magnetic field amplitudes. We demonstrate that heat production of magnetosomes can be predicted in the framework of the Stoner–Wohlfarth theory of uniaxial magnetic anisotropy subjected to significant dipolar interactions, which can be described in terms of an interaction anisotropy superimposed to that of each particle. Based on these findings, we propose optimal magnetic field amplitude and frequency values in order to maximize the heat production while keeping the undesired eddy current effects below safe and tolerable limits. The efficiency of magnetosomes as heat generators and their impact on cell viability has been checked in macrophage cells. Our results clearly indicate that the hyperthermia treatment causes both cell death and inhibition of cell proliferation. Specifically, only 36% of the treated macrophages remained alive 2 h after alternating magnetic field exposure, and 24 h later the percentage fell to 22%.
We studied CD34+ stromal cells/telocytes (CD34+SCs/TCs) in pathologic skin, after briefly examining them in normal conditions. We confirm previous studies by other authors in the normal dermis ...regarding CD34+SC/TC characteristics and distribution around vessels, nerves and cutaneous annexes, highlighting their practical absence in the papillary dermis and presence in the bulge region of perifollicular groups of very small CD34+ stromal cells. In non-tumoral skin pathology, we studied examples of the principal histologic patterns in which CD34+SCs/TCs have (1) a fundamental pathophysiological role, including (a) fibrosing/sclerosing diseases, such as systemic sclerosis, with loss of CD34+SCs/TCs and presence of stromal cells co-expressing CD34 and αSMA, and (b) metabolic degenerative processes, including basophilic degeneration of collagen, with stromal cells/telocytes in close association with degenerative fibrils, and cutaneous myxoid cysts with spindle-shaped, stellate and bulky vacuolated CD34+ stromal cells, and (2) a secondary reactive role, encompassing dermatitis—e.g., interface (erythema multiforme), acantholytic (pemphigus, Hailey–Hailey disease), lichenoid (lichen planus), subepidermal vesicular (bullous pemphigoid), psoriasiform (psoriasis), granulomatous (granuloma annulare)—vasculitis (leukocytoclastic and lymphocytic vasculitis), folliculitis, perifolliculitis and inflammation of the sweat and sebaceous glands (perifolliculitis and rosacea) and infectious dermatitis (verruca vulgaris). In skin tumor and tumor-like conditions, we studied examples of those in which CD34+ stromal cells are (1) the neoplastic component (dermatofibrosarcoma protuberans, sclerotic fibroma and solitary fibrous tumor), (2) a neoplastic component with varying presentation (fibroepithelial polyp and superficial myxofibrosarcoma) and (3) a reactive component in other tumor/tumor-like cell lines, such as those deriving from vessel periendothelial cells (myopericytoma), epithelial cells (trichoepithelioma, nevus sebaceous of Jadassohn and seborrheic keratosis), Merkel cells (Merkel cell carcinoma), melanocytes (dermal melanocytic nevi) and Schwann cells (neurofibroma and granular cell tumor).
Since late 2014, the Mexican Caribbean coast has periodically received massive, atypical influxes of pelagic Sargassum spp. (sargasso). Negative impacts associated with these influxes include ...mortality of nearshore benthic flora and fauna, beach erosion, pollution, decreasing tourism and high management costs. To understand the dynamics of the sargasso influx, we used Landsat 8 imagery (from 2016 to mid-2020) to record the coverage of sargasso in the sea off the Mexican Caribbean coastline, with a maximum reported in September 2018. Satellite image analysis also showed local differences in the quantity of beached sargasso along the coastline. Over the years, good practice for collection on the beach and for off-shore collection of sargasso have been established through trial and error, and the Mexican Government and hotel industry have spent millions of dollars on removal and off-shore detention of sargasso. Notwithstanding, sargasso also has various properties that could be harnessed in local industries. The stimulation of local industrial growth would offer alternatives to the dependence on tourism, as a circular economy, based on sargasso, is developed.
We report a case of mycosis fungoides (MF) in an 18-year-old man whose neoplastic T cells expressed CD4, CD8, and CD56, with no evidence of TCR-delta or Epstein–Barr virus (EBER) expression. ...Clinically, neither hypopigmentation nor hyperpigmentation nor poikilodermatous skin lesions were present, and the lesions subsided with oral corticoids and retinoids and environmental solar ultraviolet exposure. Our case represents the oldest patient reported so far with nonpoikilodermatous, CD8/CD56 MF and adds to the phenotypic diversity of MF in the pediatric population. This distinct phenotype does not seem to be linked to a more aggressive course than the classic CD-4 positive one.
The massive influx of pelagic
spp. (sargasso) into the Mexican Caribbean Sea has caused major deterioration of the coastal environment and has affected the tourism industry as well as livelihoods ...since 2015. Species of
have high capacity to absorb metals; thus, leachates of sargasso may contribute to contamination by potentially toxic metals when they drain into the sea and into the groundwater when dumped in inadequate land deposits. Valorization of sargasso would contribute to sustainable management; therefore, knowledge on potentially toxic metal content is necessary to define possible uses of the algae. We present concentrations of 28 elements measured using a non-destructive X-ray fluorescence analyzer (XRF) in 63 samples of sargasso collected between August 2018 and June 2019 from eight localities along ∼370 km long coastline of the Mexican Caribbean Sea. The sargasso tissues contained detectable concentrations of Al, As, Ca, Cl, Cu, Fe, K, Mg, Mn, Mo, P, Pb, Rb, S, Si, Sr, Th, U, V, and Zn. The element concentration in sargasso varied on spatial and temporal scales, which likely depended on the previous trajectory of the pelagic masses, and whether these had (or had not) passed through contaminated areas. Total arsenic concentration varied between 24-172 ppm DW, exceeding the maximum limit for seaweed intended as animal fooder (40 ppm DW) in 86% of the samples. For valorization, we recommend analyses of metal contents as a mandatory practice or avoiding uses for nutritional purposes. The high arsenic content is also of concern for environmental contamination of the sea and aquifer.
PDF
