Folia Parasitologica, vol. 44 (1997), issue 2

Amoebae isolated from organs of farmed tilapias, Oreochromis niloticus

Dykova I, Machackova B, Peckova H

Folia Parasitologica 44[2] 81-90 (1997)

Three amoeba species were isolated from 3 out of 193 farmed tilapias, Oreuchromis niloticus (L.), screened for the presence of free-living amoebae in parenchymatous organs. Hurtmannella vermiformis Page, 1967 and Rosculus ithacus Hawes, 1963 were isolated from the kidney tissue. The third strain isolated from the liver shared morphological features of Mayorella and Platyamoeha spp. and therefore its taxonomic position has not been determined as yet. Pathogenicity of cloned strain of H. vermiformis was proved in two fish hosts.

Development of sporozoites of the piscine coccidium Eimeria (sensu lato) vanasi in gut intraepithelial lymphocyte-like cells

Vilenkin M, Paperna I

Folia Parasitologica 44[2] 91-98 (1997)

Fifty-day-old fry of tilapia hybrids (Oreochromis aureus x niloticus) were placed in aquaria containing sediment with oocysts of Eimeria (sensu lato) vanasi Landsberg et Paperna. In the first 29 h after exposure sporulated oocysts in the stomach and free sporozoites in the gut could be found in examined fish. By 7 to 56 h after exposure, sporozoites, with their characteristic crystalloid body, were detected in intraepithelial lymphocyte-like and other leucocyte-like cells, but never in the epithelial cells. Infected cells were confined to the epithelial layer and did not enter the lamina propria. Within this time, some of the sporozoites divided by...

Vipera berus and V-ammodytes (Serpentes: Viperidae) represent new hosts for Caryospora simplex (Apicomplexa: Eimeriidae) in Europe

Modry D, Koudela B, Volf J, Necas P, Hudcovic T

Folia Parasitologica 44[2] 99-102 (1997)

During a survey of the coccidian parasites of reptiles, caryosporan oocysts were found in the faeces of wild and captive European viperid snakes Vipera berus (L.) and V.ammodytes (L.). Thirty two of 37 examined V. berus (86%) and 9 of 17 examined V. ammodytes (53%) specimens were found to be passing caryosporan oocysts. Morphological characters of all caryosporan isolates were identical and fitted well with the description of Caryospora simplex Leger, 1904. Experimental inoculation of severe combined immunodeficient (SCID) mice with seven isolates of C. simplex from V. berus or V. ammodytes confirmed the heteroxenous life cycle pattern, for the first...

Isolation and characterization of cytosolic malate dehydrogenase from Trichomonas vaginalis

Drmota T, Tachezy J, Kulda J

Folia Parasitologica 44[2] 103-108 (1997)

Malate dehydrogenase (EC (MDH) was purified to apparent homogeneity from the cytosolic fraction of the protozoan Trichomonas vaginalis Donne. The four step purification included ion-exchange chromatography (DEAE-Sephacel and Q-Sepharose, elution with NaCl) and affinity chromatography (Reactive Red Agarose, elution with NADH and NaCl). The enzyme was purified about 132-fold (30.6% yield) to a specific activity of 352 units mg(-1). The K-m values determined at pH 7.8 (pH optimum from 7.5 to 8.3) for oxaloacetate and NADH were 16.2 mu M and 10.6 mu M, respectively. The MDH activity was inhibited by the substrate, decreasing to 50% at about...

Larval stages of trematodes from freshwater molluscs of the Yucatan Peninsula, Mexico

Ditrich O, Scholz T, AguirreMacedo L, VargasVazquez J

Folia Parasitologica 44[2] 109-127 (1997)

Examination of 4055 molluscs of 10 species from cenotes (= sinkholes) and other freshwater bodies in the Yucatan Peninsula, Mexico revealed the presence of larval stages of 13 trematodes. The following species were found: Echinochosmus leopoldinae Scholz, Ditrich et Vargas-Vazquez, 1996, E. macrocaudatus Ditrich, Scholz et Vargas-Vazquez, 1996 (Echinostomatidae), Saccocoelioides sp. (? sogandaresi Lumsden, 1963) (Haploporidae), Crassicutis cichlasomae Manter, 1936, pleurolophocercous ophthalmocercaria sp. (Homalometridae), Ascocotyle (Ascocotyle) sp., Ascocotyle (Phagicola) nana Ransom, 1920 (Heterophyidae), Oligogonatylus manteri Watson, 1976 (Cryptogonimidae),...

Electrophoretic variations of peptidase E (PEPE) in characterizing clones and isolates of Plasmodium falciparum from different geographical areas

Ang HH, Chan KL, Mak JW

Folia Parasitologica 44[2] 128-130 (1997)

Six clones were obtained from each Plasmodium falciparum (Welch, 1897) isolate from different geographical areas, Gombak A (Malaysian), Gombak C (Malaysian), ST 9 (Malaysian), ST 12 (Malaysian), ST 85 (Malaysian), ST 148 (Malaysian), Gambian (African) and TGR (Thailand) isolates using the limiting dilution method (Rosario 1981). Forty-eight clones were obtained and were characterized by an electrophoresis isoenzyme analysis of PEPE (Peptidase E) (EC. 3.4.11 or 13). Results showed that they were pure clones as they were monovariant with regards to this enzyme unlike their parent isolates which were divariant.

Khawia baltica (Cestoidea: Caryophyllidea) from Barbus barbus bocagei from some rivers in Northern Portugal

Chubb JC, Eiras JC, Saraiva A

Folia Parasitologica 44[2] 131-138 (1997)

Eight species of fishes from rivers of Northern Portugal were examined for cestodes but only one, Barbus barbus bocagei (Steindachner), was infected: river Este (4 of 12 infected, 1,1,4 adult and 37 juvenile cestodes found respectively), Lima (1 of 8 infected, 1 juvenile cestode), Paiva (1 of 5 infected, 57 juvenile cestodes) and Sousa (1 of 13 infected, 1 adult cestode). The cestodes were Caryophyllidea. The fan-shaped scolex had very shallow incisions, with the scolex separated from the hindbody by a neck. The first vitelline follicles started a considerable distance anterior to the testes, with some vitelline follicles along the lateral margins...

Ultrastructure of three types of scolex gland cells in adult Bothriocephalus claviceps (Cestoda: Pseudophyllidea)

Zdarska Z, Nebesarova J

Folia Parasitologica 44[2] 139-146 (1997)

The ultrastructure of three types of unicellular scolex gland cells in adult cestode Bothriocephalus claviceps (Goeze, 1782) is described. The first type - apocrine gland cells transport their secretion (small rounded electron dense granules) via thin ducts into the tegument where it accumulates as projections on the body surface. The second type - eccrine gland cells press out their secretion (large oval electron dense granules) through ducts which open to the exterior surface of the tegument. The third type - microapocrine gland cells transport their secretion (large rounded electron dense granules) through thin cytoplasmic processes into the distal...

Estimation of genetic affinities between sympatric populations of Rhipicephalus pusillus ticks (Acari: Ixodidae) by analysis of cuticular hydrocarbons

EstradaPena A, Osacar JJ, Calvete C, EstradaPena R

Folia Parasitologica 44[2] 147-154 (1997)

Genetic distances and phylogenetic clustering are calculated for sympatric populations of Rhripicephalus pusillus (Gil Collado) 1939 ticks, using cuticular hydrocarbon analysis and several statistical tools (stepwise discriminant analysis, Nei's genetic distance using different sets of compounds, and Cavalli-Sforza's Brownian motion model). Discriminant analysis on genic frequencies permits the detection of the most ancient geographic relationships between the populations, while the genetic distance method determines current evolutive affinities. However, methods based on quantitative estimation provide a poor resolution. Genetic distances are very...