Aquatic invasive species are among the greatest threats to freshwater biodiversity. The aim of this study was understand effects two watermilfoil ( Myriophyllum heterophyllum Michx. and spicatum L.) on native macrophyte communities assess community response a range invasion intensities as well examine influence canopy types. We hypothesized that some would be more sensitive invasion, facilitate...

Submitted for the MAR08 Meeting of The American Physical Society Imaging massless Dirac fermion flow in graphene nanoribbons LIVIU P. ZÂRBO, Texas A&M University, BRANISLAV K. NIKOLIĆ, University of Delaware — Since its recent experimental discovery, graphene has been the focus of intense theoretical and experimental research. Its unconventional electronic structure characterized by the linear ...

Collagen is a natural and abundant polymer that serves multiple functions in both invertebrates and vertebrates. As collagen is the natural scaffolding for cells, collagen-based hydrogels are regarded as ideal materials for tissue engineering applications since they can mimic the natural cellular microenvironment. Chondrosia reniformis is a marine demosponge particularly rich in collagen, chara...

The marine sponge Chondrosia reniformis Nardo consists largely of a collagenous tissue, the mesohyl, which confers a cartilaginous consistency on the whole animal. This investigation was prompted by the incidental observation that, despite a paucity of potentially contractile elements in the mesohyl, intact C. reniformis stiffen noticeably when touched. By measuring the deflection under gravity...

Utricularia julianae, a new species from the savannas near the Oyapock River, French Guiana, is here described and illustrated. The new species is most similar to U. tenuissima, from which it can be easily distinguished by the leaves and stolons apparently lacking (vs. leaves few and on the stolons, the stolons few or lacking, in U. tenuissima), traps ellipsoid, 0.3 mm long, with 4–5 capillifor...