Scanning and transmission electron microscopy (TEM) were used to study the histopathological effects of the monogenean Macrogyrodactylus clarii Gussev, 1961 on the gills of the catfish Clarias gariepinus (Burchell). Suction generated during attachment created 'footprints' on host surfaces in which the host tissues were elevated above the general gill surface. 'Footprints' were bordered by four clefts caused by the muscular flaps on the anterior, lateral and posterior margins of the haptor. The hamuli points penetrate the gill tissue but no evidence was found for the insertion of the marginal hooklets. At the site of attachment, host cells adjacent to the lateral flaps often appeared compressed and widely spaced with large intercellular spaces. Desquamation of these surface epithelia was also apparent and some of the widely spaced epithelial cells had pseudopodium-like processes. Cells within the upper surface epithelial layer of the host were vacuolated and necrotic. Ruptured blood capillaries (blood spaces) in the secondary gill lamellae contained atypical compressed erythrocytes, agranular and granular leucocytes and evidence of haemorrhaging. Cells with fibrotic cytoplasm, putative phagocytes and host mucous cells were evidence of a host response at the site of parasite attachment. The possible role of these cells is discussed in relation to host resistance against infection., Mohammed Mohammed El-Naggar, Joanne Cable, Safaa Zaky Arafa, Samir Ahmed El-Abbassy, Graham C. Kearn., and Obsahuje bibliografii
External morphology of the nematode Pterygodermatites bovieri (Blanchard, 1886), a very rare parasite of bats in the Palaearctic region, was studied by scanning electron microscopy. Special attention was paid to the cephalic end structure and cutieular armament, which are of great systematic importance in this group of nematodes. The mouth opening of P. bovieri is subterminal and oriented dorsally. Numerous sclerotized denticles, arranged in two rows, are situated in the buccal cavity around the mouth opening. They are better developed in its ventral part. In females there are 12-14 ventral denticles. Cephalic papillae are arranged in two rows: internal (six papillae - two dorsal, two lateral and two ventral) and external (four papillae). Amphids are small, situated close to lateral cephalic papillae of the internal row. Males possess 40-41 cutieular combs in each ventro-lat-eral plate row, and, in addition, a short row of four ventral, unpaired precloacal fans. Females in our material possessed 68 cu-ticular elements represented by combs and spines, in each row. Changes of the cutieular elements shape along the nematode body length are described. Results of SEM observations are compared with previous descriptions of P. bovieri based on the light microscopical observations.
A subalgebra H of a finite dimensional Lie algebra L is said to be a SCAP-subalgebra if there is a chief series 0 = L0 \subset L1 \subset...\subset Lt = L of L such that for every i = 1, 2,..., t, we have H + Li = H + Li-1 or H ∩ Li = H ∩ Li-1. This is analogous to the concept of SCAP-subgroup, which has been studied by a number of authors. In this article, we investigate the connection between the structure of a Lie algebra and its SCAP-subalgebras and give some sufficient conditions for a Lie algebra to be solvable or supersolvable., Sara Chehrazi, Ali Reza Salemkar., and Obsahuje seznam literatury
napsal J. Petřík ; z Ústavu praktické geometrie při c.k. České vysoké škole technické v Praze, Separát z: Zemědělského archivu, and Converted from MODS to DC version 1.8 (EE patch 2018/05/24)
Schellackia ptyodactyli sp. n. is described from the fan-footed gecko Ptyodactylus hasselquistii (Donndorf) found the lower Jordan Valley, Cis-Jordan. Endogenous development was studied in geckoes necropsied 7-11 days after being inoculated with blood containing sporozoites from naturally infected geckoes of the same species. Merogony and gamogony/oogony stages, as well as sporozoites, are described by light and electron microscopy. Merogony stages, microgamonts and sporozoites conformed in fine structure to that of other eimerian coccidia. whereas wall forming bodies of the macrogamonts showed some divergence from the general pattern characteristic of eimerians and Schellackia cf. agamae. Merogony stages occurred simultaneously with gamonts and sporozoites. In the blood, sporozoites entered leucocytes, thrombocytes and erythrocytes. Parasitaemia persisted for up to 2 years in some naturally infected geckoes in captivity.
Seznam pražských ulic a náměstí s popisnými a nově i orientačními čísly domů, která doplňují jména majitelů v r. 1883., Publikace zahrnuje rovněž seznam masných krámů, průchozích domů, pamětihodných štítů, veřejných budov a pozoruhodných míst, advokátů, notářů, architektů a stavitelů, lékařů, úřadů, peněžních a pojišťovacích ústavů a soukromých obchodních škol. Vyhledávání usnadňuje rejstřík., sestavil Kamil Řepa, Oborové slovníky, encyklopedie, bibliografie., and Pražské adresáře a ukazatele.