Ulvan, a sulphated polysaccharide has been extracted from the green seaweed, Ulva lactuca. Results showed that ulvan pocesses 59.5% sugars, 16.9% sulphate, 19.5% uronic acid of viscosity of solution is 21(mPa). Functional groups of ulvan have been identified with IR spectrum. The efficacy of ulvan was tested against experimentally induced fibrosarcoma in wistar rats and found to be promising.

Many studies have documented habitat cascades where two co-occurring habitat-forming species control biodiversity. However, more than two habitat-formers could theoretically co-occur. We here documented a sixth-level habitat cascade from the Avon-Heathcote Estuary, New Zealand, by correlating counts of attached inhabitants to the size and accumulated biomass of their biogenic hosts. These data ...

Within the sheltered creeks of Cádiz bay, Ulva thalli form extended mat-like canopies. The effect of solar ultraviolet radiation on photosynthetic activity, the composition of photosynthetic and xanthophyll cycle pigments, and the amount of RubisCO, chaperonin 60 (CPN 60), and the induction of DNA damage in Ulva aff. rotundata Bliding from southern Spain was assessed in the field. Samples colle...

Receiving coastal waters and estuaries are among the most nutrient-enriched environments on earth, and one of the symptoms of the resulting eutrophication is the proliferation of opportunistic, fast-growing marine seaweeds. Here, we used a widespread macroalga often involved in blooms, Ulva spp., to investigate how supply of nitrogen (N) and phosphorus (P), the two main potential growth-limitin...

Despite the complexity of natural systems, heterogeneity caused by the fragmentation of habitats has seldom been considered when investigating ecosystem processes. Empirical approaches that have included the influence of heterogeneity tend to be biased towards terrestrial habitats; yet marine systems offer opportunities by virtue of their relative ease of manipulation, rapid response times and ...

W tekście, na podstawie opracowań m.in. Giovanniego Sartoriego, Larry’ego Diamonda, Philippe’a Schmittera i Juana J. Linza, zawierających przedstawienie kluczowych potencjalnych wewnętrznychsprzeczności paradoksów systemów demokratycznych, zostanie podjęta próba odpowiedzi pytanie, jakie zasadnicze antynomie problemy można wskazać w aktualnym funkcjonowaniu polskiego systemu politycznego. uwaga...