Pathological and histopatnotogical studies of the swimbladder of eels Anguilla anguitla infected by Angutlticpta crassus (Nemafoda: Dracuncuioidea)

The swimbladder lesions produced by Anguillicola crassus (Nematoda) infection, causing mass mortality among eels in Lake Balaton (Hungary) were studied by histological methods. In the initial phase of infection, no severe changes developed in the swimbladder wall despite the presence and intensive blood-sucking activity of worms that filled the lumen of the swimbladder. After disruption of the worms and primarily because of repeated reinfection by larvae, however, the wall of the swimblaader markedly thickened and showed degenerative, inflammatory and proliferative changes. Acute processes were characterized by epithelial hyperplasia and hyperaemia of the swimbladder wall. In cases of chronic swimbladder inflammation, oedema and hyperplasia of tissues of the tunica propria, submucosa and serosa could be observed, as well as granulomatoid infiltration by mononuclear cells and fibrinoid degeneration around the larvae

The smut fungi on Cynodon, including Sporisorium normanensis sp. nov. from Australia

Sporisorium normanensis sp. nov. (Ustilaginaceae, Ustilaginomycetes) is described and illustrated from Cynodon dactylon collected in northern Queensland, Australia. Brief descriptions and a key are provided for the six Ustilaginomycetes described from Cynodon, including Sporisorium cynodontis comb. nov

A new smut fungus, Sporisorium centrale sp. nov., on Themeda from Australia

Sporisorium centrale sp. nov. (Ustilaginaceae, Ustilaginomycetes) is described and illustrated from Themeda triandra collected in the Northern Territory, Australia. It is compared with Sporisorium punctatum

Two new species of Ustilaginomycetes on Chrysopogon fallax from Australia

Sporisorium fallax sp. nov. (Ustilaginaceae, Ustilaginomycetes) is described and illustrated from inflorescences of Chrysopogon fallax collected in the Northern Territory, Australia. Ribosomal DNA Internal Transcribed Spacer sequences confirmed S. fallax to be distinct from two morphologically similar species, S. tumefaciens and S. tumiforme, on C. fallax. Macalpinomyces tubiformis sp. nov. (Ustilaginaceae, Ustilaginomycetes) is described and illustrated from ovaries of Chrysopogon fallax collected in Queensland, Australia

Quantum rings with time dependent spin-orbit coupling: Rabi oscillations, spintronic Schrodinger-cat states, and conductance properties

The strength of the (Rashba-type) spin-orbit coupling in mesoscopic semiconductor rings can be tuned with external gate voltages. Here we consider the case of a periodically changing spin-orbit interaction strength as induced by sinusoidal voltages. In a closed one dimensional quantum ring with weak spin-orbit coupling, Rabi oscillations are shown to appear. We find that the time evolution of initially localized wave packets exhibits a series of collapse and revival phenomena. Partial revivals -- that are typical in nonlinear systems -- are shown to correspond to superpositions of states localized at different spatial positions along the ring. These "spintronic Schrodinger-cat sates" appear periodically, and similarly to their counterparts in other physical systems, they are found to be sensitive to environment induced disturbances. The time dependent spin transport problem, when leads are attached to the ring, is also solved. We show that the "sideband currents" induced by the oscillating spin-orbit interaction strength can become the dominant output channel, even in the presence of moderate thermal fluctuations and random scattering events.Comment: 11 pages, 9 figures, submitted to PR