The microsporidian Kabatana arthuri (Lom, Dyková et Shaharom, 1990) induced severe regressive changes in trunk muscles of Pangasius sutchi (Fowler) from Thailand. Necrotic changes developed in muscle fibres around the developmental stages and on the periphery of giant aggregates of spores. The main feature of the host defence reaction was the phagocytic activity of macrophages. Inflammatory reaction was only exceptionally observed. Spore-laden macrophages were found in various tissues and organs; their infiltration in epidermis including its outermost layers may effectively enhance the spread of infection while the hosts still live.
Physaloptera brevivaginata has been found parasitising the stomach of two species of bats of the family Vesperti-lionidae, Myotis myotis and Myotis blythii, in Spain. A comparative study of the prevalences and mean intensities of parasitism by this physalopterid revealed no statistically significant differences between the two hosts. Likewise, no relationship was found between parasite intensity and host body weight. The histopathological study of the stomach lesion revealed destruction of the mucosa, with degeneration of the gastric glands, loss of the muscularis mucosae and focal necrosis at the points where the cephalic extremities of both sexes of this nematode attach to the mucosa. The present paper is the first study of gastric pathology caused by an adult physalopterid in bats.
The Institute of History at the University in Zielona Gora systematically focuses on research on settlement changes and population development in the Western border region of contemporary Poland, which in the past was settled first by Slavic and later by German populations. This article provides information on the most important studies that represent sources of information on the history of settlement, ethnic structure, and demographic development in this region, dating back to the end of the 18th century, but emphasising more recent work, which mainly targets the Polish parts of Lusatia and Lubusz. and Z polštiny přeložil Eduard Maur.
The development of research in physiology, ecology, biochemistiy and biophysics of photosynthesis of algae and higher plants at the territory of Czechoslovakia is reviewed starting with ideas of the 17* century. Individual photosynthetic studies in the second half of the 19* and the first half of the 20* centiuy were followed by a most rapid development of photosynthetic research teams in Czechoslovakia mainly in die sixties. Among the most important research topics the relationships between gas exchange, carbon balance and plant productivity, effects of minerd nutrients, stress factors (including pathogens) and leaf development on pigment content, photosynthetic structures and activities, ecological studies in water reservoirs and forests peaking in modelling of canopy productivity, energy transfer in primary processes, composition and energetics of chlorophyll-protein complexes, structure and fimction of carboxylases, photosynthetic activities of regenerants and transgenic plants, and especially mechanisms of photoinhibition may be listed. An important contribution to progress in photosynthesis research were methodological studies, including also mass cultivation of algae, and intemational publication and bibliographic activities.