155 research outputs found
Economic growth and environment: tourism as a trigger for green growth
No full textThe paper analyses the implications of tourism activities for economic growth and environmental assets, focusing especially on small island countries. The author develops a stylized dynamic economic model in which tourism is the trigger of the incentive mechanism leading to abatement activities and economic growth. The basic idea is that tourists choose the location to visit according to a number of factors (including environmental quality) which are affected by residents' choices. If residents engage in environmental protection activities, it then may be possible for environmentally based tourism economies to reach a smooth development process. The author shows that the (sustainable) balanced growth path is the only viable equilibrium, and along such a path consumption grows while environmental quality rises. Tourists' preferences crucially affect the long-run outcome, since economic and environmental growth rates increase with the green preference and decrease with the grey preference and crowding aversion parameters. Thus, if tourism specialization is to be the pathway to development, green tourism will need to be promoted
Uncertainty, crowding aversion and tourism aversion in tourism destinations
No full texthe author analyses the implications of crowding aversion and tourism aversion for the economic performance of tourism destinations in the case of uncertain tourist inflows. He analytically characterizes all possible scenarios, showing how different the preferences of tourists (towards crowding) and residents (towards tourism) interact and affect the economic outcome. The paper shows that, when tourists are crowding-averse (crowding lovers), uncertainty leads to deterioration (improvement) of economic performance, while it does not affect performance at all when tourists are crowding-indifferent. However, assessing how this will be reflected in welfare changes is more complex, since it depends also on the degree of tourism aversion among local residents
On the carrying capacity and the optimal number of visitors in tourism destinations
No full textTourism specialization on the one hand may be a successful tool to achieve fast economic growth, and, on the other hand, may be detrimental for natural resources. Finding the right balance between economic benefits and environmental costs is essential to reach sustainable development, ensuring that tourist numbers do not exceed the carrying capacity of the tourism destination. In this context, the author analyses the determination of the optimal number of visitors in a tourism-based economy and shows that if the tourist number is optimally determined long-run sustainable growth will be possible. He also shows that the optimal number of tourists is strictly smaller than the carrying capacity of the tourism destination, and that such a condition is vital to achieve long-run growth
Tecniche lineari e azimutali nelle indagini Ground Penetrating Radar per l’individuazione di sottoservizi in aree urbane
No full textCaracterização de genes codificadores de entomotoxinas de Photorhabdus luminescens subsp. akhurstii.
No full textUm isolado nativo da bactéria Photorhabdus luminescens (linhagem IB01) simbionte de nematóides do gênero Heterorhabditis foi identificada como Photorhabdus luminescens subsp. akhurstii. Através da comparação de genes tccC e tcdA da linhagem IB01 com os de outras já estudadas verificou-se a presença de genes semelhantes aos genes tcdA1, tcdA2, tcdA3, tcdA4, tccC1, tccC2 e tccC3 do isolado W14 de P. luminescens e tccC6 do isolado TT01. Os genes tcdA1 e tcdA4 de IB01 foram clonados em Escherichia coli e totalmente seqüenciados. Foi construído um vetor para otimização da expressão do gene tcdA1 em bactérias. Foi produzida uma biblioteca genômica e os cosmídeos contendo genes tcdA foram identificados. A toxicidade oral e injetável da linhagem IB01 e de clones de E. coli contendo genes da mesma foi testada contra larvas dos insetos Galleria mellonella L. e Diatraea saccharalis (Fabr.).Tese (Doutorado em Biotecnologia) - Universidade de São Paulo, São Paulo. Orientador: Itamar Soares de Melo, Embrapa Meio Ambiente
Marsiglio of Padova: Father and Creator of the Modern Legal System
No full textThis 14th century philosopher extended the theories of Aristotle and Thomas Aquinas in proposing the divorce of secular law from religious rule. In his view, only human jurisdiction and human law are valid in dealing with the natural world. The author presents Marsiglio as the first truly modem formulator of positive law, and his work as the foundation of the modern secular state
Marsiglio of Padova: Father and Creator of the Modern Legal System
No full textThis 14th century philosopher extended the theories of Aristotle and Thomas Aquinas in proposing the divorce of secular law from religious rule. In his view, only human jurisdiction and human law are valid in dealing with the natural world. The author presents Marsiglio as the first truly modem formulator of positive law, and his work as the foundation of the modern secular state
Devozioni e sentimento religioso di un aristocratico in carcere. Giovanni Marsiglio Pio nel Castelvecchio di Ferrara
No full textGiovanni Marsiglio Pio, esponente della più potente famiglia di Carpi, fu recluso in carcere per circa otto anni perché accusato, insieme ad altri suoi parenti, di aver congiurato contro Borso d'Este. In questo periodo ebbe modo non solo di registrare in una sorta di diario, fra l'altro, i doni ricevuti e le persone incontrate, ma anche di scrivere versi poi raccolti in un Canzoniere. Si intende qui valorizzare questi documenti e arricchire così il dossier delle testimonianze di religiosità carceraria tardomedievale, con un caso abbastanza particolare: quello di un prigioniero di alto lignaggio custodito in una prigione speciale, che comportava una dura restrizione di libertà, ma con modalità alquanto diverse rispetto a quelle delle carceri comunali delle città bassomedievali italiane
Elevated serum progesterone on the day of HCG administration in IVF is associated with a higher pregnancy rate in polycystic ovary syndrome
No full textOur study compared 84 patients with polycystic ovary syndrome (PCOS) with 84 control patients who had normal ovaries and who were matched for the main determinants of success in in-vitro fertilization (IVF) and embryo transfer. Serum concentrations of oestradiol and progesterone on the day of human chorionic gonadotrophin (HCG) injection were significantly higher in PCOS than in normal patients (oestradiol 2016 +/- 1.8 pg/ml versus 1456 +/- 40.9 pg/ml, P or = 1.2 ng/ml showed a higher pregnancy and miscarriage rate than PCOS patients with progesterone < 1.2 ng/ml (26.6 versus 17.9%, P < 0.01; and 41.7% versus 14.3%, P < 0.01 respectively). These findings suggest that premature progesterone production does not have an adverse effect on pregnancy rate in PCOS, but on the contrary, may be a predictor for success in IVF/embryo transfer
ESSAYS ON ECONOMIC GROWTH: TECHNICAL PROGRESS, POPULATION DYNAMICS AND THE ENVIRONMENT
No full textThis thesis analyzes economic growth and how this is related to diff erent issues, namely technical progress, population change and environment. It studies each of these issues in a separate paper. The choice of these issues has been driven by their growing importance in the analysis of the development process of modern economies. Technological progress, jointly with the accumulation of human capital, is one of the most relevant causes of the consistent growth showed in the last century by industrialized countries; therefore, it is important to understand what are its features in order to promote further technical improvements. Demographic growth has dramatically changed during and after the transition from stagnation (before the industrial revolution) to growth (after that): fertility and mortality rates have dropped and many economies now show a rate of population growth just over the replacement one; studying the implications of population change for economic growth can be really important in order to understand whether population policies can be necessary or not for the economy. The environment is an important source of welfare services to people and just in the last decades such a fact has been widely recognized: this is due to the fact that as the economy reaches a certain level of development, its agents feel the importance of some aspects which in a previous phase they did not care about; human activity is the main source of environment degradation and an increasing need for the policy makers to understand how regulating it has arisen. As it may be clear, these topics are crucially interrelated: population growth a ffects technical progress (through the number of researchers employed in R&D activity) and the environment (through the necessity of satisfying the needs of a larger population, in terms of consumption demand and waste production), while technical progress a ffects the environment (switching from polluting to clean technologies such an e ffect can crucially change)
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