Chased by a Unicorn

The parable of the Futile Life, which is an excerpt of the medieval, multilingual novel Barlaam and Josaphat, conceals a unique interpretative approach, in terms of symbolism, of an ancient and intercultural mythological symbol, that of the unicorn. From a first examination of the cultural environment – textual and iconographical – of the unicorn’s appearance, it would seem that the symbolic substance of this animal motif was imbued with the notions of the high virtues of the Christian ideological system (e.g. virginity, purity, salvation). However, the parabolic narrative of the Futile Life reveals another aspect. This is the aspect of the inward cruel power that drives a man to the wrong choice, preventing him from finding the proper spiritual way out to save himself after his physical death in the vanity world in which he lives transiently. Probably, the beauty of a unicorn now symbolizes something not so pure. Indeed, the story of the Futile Life is transformed into one of the most common iconographic themes in monumental Christian painting, and, at the same time, it raises reasonable concerns while seeking adequate explanations. So, through a list of relevant examples of monumental and miniature art, we will look for the beginnings of the two aspects of this ancient symbol, with an emphasis on the parable under examination, offering a new perspective on the semiotic analysis of Antiquity during the Middle Ages.A parábola da Vida Fútil, que constitui uma parte do romance medieval multilíngue Barlaão e Josafat, esconde uma abordagem interpretativa única, em termos de simbolismo, de um símbolo mitológico antigo e intercultural, o do unicórnio. Um primeiro exame do ambiente cultural – textual e iconográfico – da aparência do unicórnio dá a entender que a substância simbólica deste motivo animal terá sido imbuída de noções decorrentes das altas virtudes do sistema ideológico cristão (por exemplo, virgindade, pureza e salvação). No entanto, a narrativa parabólica da Vida Fútil revela outro aspecto. Trata-se do poder interior cruel que leva o homem à escolha errada, impedindo-o de encontrar o caminho espiritual adequado para salvar-se após a sua morte física no mundo de vaidade em que vive temporariamente. Provavelmente, a beleza do unicórnio simboliza agora algo que já não é tão puro. Na verdade, a história da Vida Fútil tornou-se num dos temas iconográficos mais comuns da pintura cristã monumental, incluindo a presença do unicórnio, o que levanta, ao mesmo tempo, preocupações razoáveis e a necessidade de explicações adequadas. Assim, através de uma lista de exemplos relevantes de arte monumental e em miniatura, procuraremos identificar o início dos dois aspectos deste antigo símbolo, com ênfase para a parábola estudada, oferecendo uma nova perspetiva sobre a análise semiótica da Antiguidade durante a Idade Média

Confinement, solitons and the equivalence between the sine-Gordon and massive Thirring models

We consider a two-dimensional integrable and conformally invariant field theory possessing two Dirac spinors and three scalar fields. The interaction couples bilinear terms in the spinors to exponentials of the scalars. Its integrability properties are based on the sl(2) affine Kac-Moody algebra, and it is a simple example of the so-called conformal affine Toda theories coupled to matter fields. We show, using bosonization techniques, that the classical equivalence between a U(1) Noether current and the topological current holds true at the quantum level, and then leads to a bag model like mechanism for the confinement of the spinor fields inside the solitons. By bosonizing the spinors we show that the theory decouples into a sine-Gordon model and free scalars. We construct the two-soliton solutions and show that their interactions lead to the same time delays as those for the sine-Gordon solitons. The model provides a good laboratory to test duality ideas in the context of the equivalence between the sine-Gordon and Thirring theories.Comment: LaTeX, 26 page

A Sensitive Faraday Rotation Setup Using Triple Modulation

The utilization of polarized targets in scattering experiments has become a common practice in many major accelerator laboratories. Noble gases are especially suitable for such applications, since they can be easily hyper-polarized using spin exchange or metastable pumping techniques. Polarized helium-3 is a very popular target because it often serves as an effective polarized neutron due to its simple nuclear structure. A favorite cell material to generate and store polarized helium-3 is GE-180, a relatively dense aluminosilicate glass. In this paper, we present a Faraday rotation method, using a new triple modulation technique, where the measurement of the Verdet constants of SF57 flint glass, pyrex glass, and air were tested. The sensitivity obtained shows that this technique may be implemented in future cell wall characterization and thickness measurements. We also discuss the first ever extraction of the Verdet constant of GE-180 glass for four wavelength values of 632 nm, 773 nm, 1500 nm, and 1547 nm, whereupon the expected 1/{\lambda}^{2} dependence was observed.Comment: 4 pages, 2 figures Updated version for RSI submissio

Intra-specific responses of Cymodocea nodosa to macro-nutrient, irradiance and copper exposure

Excess macro-nutrients, metal contamination and light limitation are three of the most commonly encountered anthropogenic stressors affecting seagrass meadows. In this study, the effects of different combinations of nutrients (N-NO3, P-PO4), copper and irradiance were investigated in shoots of Cymodocea nodosa collected from three meadows in the N. Aegean Sea, one (Nea Karvali) impacted by anthropogenically-derived environmental stressors and two in more pristine condition (Thasos, Brasidas). In a series of laboratory experiments, shoots were exposed to varying nutrient and heavy metal concentrations, as well as varying irradiance levels, for 8days and the effective quantum yield (δF/Fm') and leaf elongation were quantified. Results showed that C. nodosa increased δF/Fm' under high nutrient concentrations (30μΜ N-NO3--2μΜ P-PO43-) but significant differences were only apparent in shoots collected from the oligotrophic-less stressed meadows. Irradiance affected δF/Fm' significantly in all shoots irrespective of source and PO4-P concentration, while higher values were measured under low light conditions and it was identified as the main pathway of eutrophication stress in N. Aegean Cymodocea meadows. Shoots, independently of acclimation were tolerant to copper enrichment, with only the highest copper concentrations (4.7 and 7.9μM) having significant negative effects on δF/Fm'. Shoots from the more pristine meadows were less affected by Cu than those from the highly stressed meadow

Ecological Evaluation Index continuous formula (EEI-c) application: a step forward for functional groups, the formula and reference condition values

The Ecological Evaluation Index continuous formula (EEI-c) was designed to estimate the habitat- based ecological status of rocky coastal and sedimentary transitional waters using shallow benthic macrophyte communities as bioindicators. This study aimed to remedy the weaknesses of the currently used EEI methodology in: (1) ecological status groups (ESG), (2) the formula, and (3) reference condition values. A cluster analysis of twelve species traits was used to delineate ESGs. Two main clusters (ESG I, late-successional; ESG II, opportunistic) were identified that were hierarchically divided into three and two sub-clusters, respectively: ESG I comprised thick perennial (IA), thick plastic (IB) and shade-adapted plastic (IC) coastal water species, and angiosperm plastic (IA), thick plastic (IB) and shade-adapted plastic (IC) transitional water species. ESG II comprised fleshy opportunistic (IIB) and filamentous sheet-like opportunistic (IIA) species both in coastal and transitional waters. To avoid discrete jumps at the boundaries between predefined ecological categories, a hyperbolic model that approximates the index values and expresses the ecosystem status in continuous numbers was developed. Seventy-four quantitative and destructive samples of the upper infralittoralCystoseira crinita and coastal lagoonRuppia cirrhosa communities from tentative pristine to less impacted sites in Greece verified 10 as an ‘ideal’ EEI-c reference condition value

Ecological evaluation of transitional and coastal waters: A marine benthic macrophytes-based model

A model to estimate the ecological status and identify restoration targets of transitional and coastal waters was developed. Marine benthic macrophytic species (seaweeds, seagrasses) were used to indicate shifts in the aquatic ecosystem from the pristine state with late-successional species (Ecological State Group I) to the degraded state with opportunistic (ESG II) species. The first group comprises species with a thick or calcareous thallus, low growth rates and long life cycles (perennials), whereas the second group includes sheet-like and filamentous species with high growth rates and short life cycles (annuals). Seagrasses were included in the first group, whereas Cyanophyceae and species with a coarsely branched thallus were included in the second group.The evaluation of ecological status into five categories from high to bad includes a cross comparison in a matrix of the ESGs and a numerical scoring system (Ecological Evaluation Index). The model could allow comparisons, ranking and setting of priorities at regional and national levels fulfilling the requirements of the EU Water Frame Directive. A successful application of the model was realized in selected lagoons of the Macedonian and Thrace region (North Greece) and in the Saronic Gulf coastal ecosystems (Central Greece)

What’s new in marine botany of the Eastern Mediterranean?

Acknowledgements We would like to acknowledge many years of funding support from the TOTAL Foundation (Paris) within the framework of the project “Brown algal biodiversity and ecology in the Eastern Mediterranean Sea” which has enabled and inspired much of the work covered in this editorial and this special issue. Special thanks go to Laure Fournier (TOTAL Foundation) for her support through inspiring discussions, mentoring and networking.Peer reviewedPublisher PD