This book explores the view that tourism can be a pathway to hope and happiness. It examines the role of tourism in preserving natural and architectural wonders, bringing out the best in tourists and ...locals and adding economic value if managed sustainably. It is a useful resource for students and researchers in tourism, psychology and philosophy.
Critical debates in tourism Singh, Tej Vir
Multilingual Matters eBooks,
2012., 2012, 2012-08-14, Letnik:
57
eBook, Book
Odprti dostop
The book examines perplexing tourism debates such as the relevance of mass tourism, climate change, authenticity, tourism and poverty and slow tourism. It covers applied aspects of sociology, ...anthropology, humanities and biosciences. It is unique in its presentation and style and will be an essential resource for academics and practitioners.
In this book experts from different disciplines and diverse geographic regions discuss fundamental, often controversial topics in the field of tourism studies. The debates include subjects such as ...the concept of the `tourist', the long-term sustainability of tourism development, the growth of volunteer tourism and the vulnerability of tourism.
(−)‐Epicatechin‐3‐gallate (1) is one of the principal catechins of green tea and exhibits cancer‐preventive activities in various animal models. However, this compound is unstable in neutral or ...alkaline medium and, therefore, has a poor bioavailability. To improve its stability, O‐acyl derivatives of 1 were prepared by isolating the partially purified tea catechin fraction from green tea extract and treating it with a variety of acylating agents. The resulting derivatives, compounds 2–6, were screened for their antitumor potential against 7,12‐dimethylbenzaanthracene (DMBA)/12‐O‐tetradecanoylphorbol‐13‐acetate (TPA)‐induced squamous cell carcinogenesis of skin in mice. The results showed that the antitumor activity decreased with the increase in size of the chain length of the acyl groups, i.e., from compound 2, derivative with an Ac group, to compound 6, possessing a valeryl group. Moreover, the C4 derivative with a branched acyl chain, 5, had a lower activity than the linear C4 derivative 4. This reduction in the inhibitory activity may be due to the steric hindrance by the two Me groups. Moreover, significant increases in the protein levels analyzed by ELISA of c‐Jun, p65, and p53 were observed in the skin of DMBA/TPA treated mice, whereas mice treated with 2 and DMBA/TPA had a similar expression of these transcription factors than the control mice. The prodrug potential of the O‐acyl derivatives 2–6 showed that they were adequately stable to be absorbed intact from the intestine, more stable at gastric pH, and suitable for oral administration.
Tourism as a dynamic phenomenon has a wonderful capacity to change, adapt and evolve. At the beginning of the 21st Century we are witnessing a growing demand from tourists for amazing and bizarre ...experiences, and more extreme and unusual environments. Written by leading researchers from around the world, New Horizons in Tourism, examines this new wave of tourism. It presents a host of examples of out-of-the-ordinary tourism including cutting-edge tourism activities such as vacationing in space and discovering the forbidden lands of Antarctica and Arctic regions. It also explores the trends of pro-poor and volunteer tourism, ecotourism, the rise in the number of footloose senior citizens, and the growing attraction of areas of conflict and atrocity.
A rapid fluorofunctionalization of phenyl substituted alkenes using selectfluor™ (F-TEDA-BF4) in water and methanol occurs to give α-fluorohydrins and α-fluoromethoxy compounds respectively under ...microwave radiations. The electrophilic addition of ‘FOH’ and ‘FOMe’ on the double bond takes place regioselectively with excellent yield. Display omitted
► A rapid fluorofunctionalization of alkenes occurs using selectfluor™ and microwaves. ► Phenyl group plays a crucial role during the fluorofunctionalization of alkenes. ► Addition of ‘FOH’ and ‘FOMe’ takes place regioselectively on alkenes.
A rapid fluorofunctionalization of alkenes and diene using selectfluor™ has been uncovered. The olefins such as 1-phenyl ethene; 1,1-diphenylethene; (E)-1,2-diphenylethene; (E)-1,2-dinaphthylethene; 1,1,2-triphenylethene; 1,1,2,2-tetraphenylethene and 1,1,4-triphenyl-1,3-butadiene react with selectfluor™ (F-TEDA-BF4) in water and methanol to give α-fluorohydrins and α-fluoromethoxy compounds respectively under microwave radiations. The electrophilic addition of ‘FOH’ and ‘FOMe’ on the double bond occurs regioselectively with excellent yield.
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