Search results: 4,217 results (approx.)

1. ATP versus pyrophosphate: glycolysis revisited in parasitic protists.

Pyrophosphate-dependent enzymes (pyrophosphate-dependent phosphofructokinase, pyruvate phosphate dikinase, phosphoenol pyruvate carboxytransphosphorylase, pyrophosphate-dependent acetate kinase, pyrophosphate-acetate kinase), pyrophosphate-dependent glycolysis, and opportunities for chemotherapy...

Author(s) : Mertens, E.

Journal article : Parasitology Today 1993 Vol.9 No.4 pp.122-126 ref.43

2. Supplement. The Society of Protozoologists. 1992 Abstracts.

Abstracts from 8 meetings of The Society of Protozoologists (45th Annual Meeting, Argentinian Section Annual Meeting, German Section 11th Annual Meeting, Israeli Section Annual Meeting, Italian Section 13th Annual Meeting, Groupment des Protistologues de Langue Française 31st Annual Meeting, 3rd...

Conference paper; Journal article : Journal of Eukaryotic Microbiology 1993 Vol.40 No.1 pp.1a-54a

3. Naturally occurring antibodies that react with protozoan parasites.

General features of naturally occurring antibodies that react with protozoan parasites (except malaria) are reviewed with regard to: natural antibodies in humans and other animals; reactivity of natural antibodies with protozoan parasites; roles of natural antibodies in immunity against infection.

Author(s) : Konishi, E.

Journal article : Parasitology Today 1993 Vol.9 No.10 pp.361-364 ref.41

8. Ultrastructural and cytochemical identification of peroxisomes in the ciliate Ichthyophthirius multifiliis.

The peroxisomes of Ichthyophthirius multifiliis collected from goldfish (Carassius auratus) were studied, using ultrastructural and cytochemical techniques. Most peroxisomes possessed a circular or oval section less than 0.6 µm in diameter. However, some dumbbell-shaped and elongated peroxisomes...

Author(s) : Lobo-da-Cunha, A.; Azevedo, C.

Journal article : Journal of Eukaryotic Microbiology 1993 Vol.40 No.2 pp.169-171 ref.15

9. De novo purine biosynthesis in a free living protozoan parasite, Acanthamoeba polypha[ga].

Acanthamoeba polyphaga 435/89, was shown to utilize radiolabelled formate and glycine as precursors for purine biosynthesis and to grow in medium devoid of any source of preformed purine compounds. The organism also incorporated into its nucleic acids radiolabel derived from adenosine and guanosine ...

Author(s) : Ogbunude, P. O. J.; Baer, H. P.

Journal article : Tropical Medicine and Parasitology 1993 Vol.44 No.1 pp.19-22 ref.16

10. Chitin: a cell-surface component of Phytomonas françai.

The occurrence of chitin as a structural component of the surface of Phytomonas françai was demonstrated by paper and gas-liquid chromatographic analysis of the products of enzymatic and chemical hydrolysis of alkali-resistant polysaccharides, lectin binding, glycosidase digestion, and infrared...

Author(s) : Nakamura, C. V.; Esteves, M. J. G.; Andrade, A. F. B.; Alviano, C. S.; Souza, W. de; Angluster, J.

Journal article : Parasitology Research 1993 Vol.79 No.6 pp.523-526 ref.24

11. The developmentally regulated trans-sialidase from Trypanosoma brucei sialylates the procyclic acidic repetitive protein.

A developmentally regulated trans-sialidase activity is present on the surface of procyclic Trypanosoma brucei. Bloodstream stages display no trans-sialidase activity. T. brucei trans-sialidase is capable of transferring sialic acids from a variety of glycoconjugates into new glycosidic linkages...

Author(s) : Engstler, M.; Reuter, G.; Schauer, R.

Journal article : Molecular and Biochemical Parasitology 1993 Vol.61 No.1 pp.1-13 ref.36

12. Transient adenylate cyclase activation accompanies differentiation of Trypanosoma brucei from bloodstream to procyclic forms.

Pleomorphic bloodstream forms of Trypanosoma brucei differentiate synchronously into procyclic forms when cultivated at 27°C in the presence of citrate/cis-aconitate. The activity of adenylate cyclase was monitored during this process. Two phases of transient stimulation were observed. The first...

Author(s) : Rolin, S.; Paindavoine, P.; Hanocq-Quertier, J.; Hanocq, F.; Claes, Y.; Le Ray, D.; Overath, P.; Pays, E.

Journal article : Molecular and Biochemical Parasitology 1993 Vol.61 No.1 pp.115-125 ref.54

13. Ornithine decarboxylase activity in Entamoeba invadens.

Growth of E. invadens was paralleled by a concomitant increase in ornithine decarboxylase activity which peaked after 5 days of cultivation in TYI-S-33 medium. Over this period, enzyme activity increased about 9-fold with respect to that present at the start of incubation. Thereafter and coinciding ...

Author(s) : Calvo-Méndez, C.; Villagómez-Castro, J. C.; López-Romero, E.

Journal article : International Journal for Parasitology 1993 Vol.23 No.7 pp.847-852 ref.27

14. Molecular species analysis of phospholipids from Trypanosoma brucei bloodstream and procyclic forms.

A quantitative description is presented of the molecular species composition of the major phospholipid classes in bloodstream and procyclic forms of T. brucei. Phospholipid classes were resolved by 2-dimensional thin-layer chromatography. Diradylglycerols were released from individual phospholipid...

Author(s) : Patnaik, P. K.; Field, M. C.; Menon, A. K.; Cross, G. A. M.; Yee, M. C.; Bütikofer, P.

Journal article : Molecular and Biochemical Parasitology 1993 Vol.58 No.1 pp.97-105 ref.42

15. Active transport of smallcap˜L-proline in the protozoan parasite Trypanosoma brucei brucei.

The characteristics of smallcap˜L-proline transport in the procyclic form of T. brucei were studied by using smallcap˜L-[14C]proline and a quick separation technique by centrifugation through an oil mixture. smallcap˜L-Proline uptake displayed typical Michaelis-Menten kinetics, with a Km of 19...

Author(s) : L'Hostis, C.; Geindre, M.; Deshusses, J.

Journal article : Biochemical Journal (London) 1993 Vol.291 No.1 pp.297-301 ref.22

16. Processing of food vacuoles in the parasitic ciliate Ichthyophthirius multifiliis after exit from the host.

The digestive cycle of Ichthyophthirius multifiliis can be divided into 3 main stages. During stage A the vacuoles are not yet condensed. This stage can be subdivided into an early phase in which food vacuoles contain almost intact fish cells and a later phase in which dense material accumulates at ...

Author(s) : Lobo-da-Cunha, A.; Azevedo, C.

Journal article : Parasitology Research 1993 Vol.79 No.4 pp.272-278 ref.24

17. Myosin-like protein (Mr 175,000) in Gregarina blaberae.

A myosin-like protein (175 000 MW) was detected Gregarina blaberae, by both immunofluorescence and immunoblotting of one- and 2-dimensional electrophoresis gels using anti-myosin antibodies. This protein was present in the trophozoite ghost but not in the cytoplasmic extract, nor in extract from...

Author(s) : Ghazali, M.; Schrével, J.

Journal article : Journal of Eukaryotic Microbiology 1993 Vol.40 No.3 pp.345-354 ref.61

18. Detection of chitin in spores of Myxobolus muelleri and M. subepithelialis (Myxosporea, Myxozoa).

It was shown that chitin represents a substantial part of the polar capsule walls of both Myxobolus muelleri and M. subepithelialis by binding of fluorescein isothiocyanate-conjugated lectin wheat-germ agglutinin (FITC-WGA) and calcofluor white (CW). Semi-thin sections of spores embedded in LR...

Author(s) : Lukeš, J.; Volf, P.; Lom, J.

Journal article : Parasitology Research 1993 Vol.79 No.5 pp.439-440 ref.10

19. Encystation in Entamoeba invadens.

The process of encystation in Entamoeba invadens is discussed with regard to biochemical events and chitin metabolism (a strategic target?).

Author(s) : López-Romero, E.; Villagómez-Castro, J. C.

Journal article : Parasitology Today 1993 Vol.9 No.6 pp.225-227 ref.31

20. Glucose catabolism in African trypanosomes: evidence that the terminal step is catalyzed by a pyruvate transporter capable of facilitating uptake of toxic analogs.

Pyruvate release from Trypanosoma brucei (ILTat 1.3) supplied with glucose was very rapid, proceeding with an apparent Vmax of 214 nmol × min-1. Counterflow experiments with [14C]pyruvate demonstrated that this metabolic end product can be taken up by actively metabolizing cells consistent with the ...

Author(s) : Barnard, J. P.; Reynafarje, B.; Pedersen, P. L.

Journal article : Journal of Biological Chemistry 1993 Vol.268 No.5 pp.3654-3661 ref.24

21. Naegleria: a research partner for cell and developmental biology.

This essay concludes that organisms in the genus Naegleria offer special opportunities for research in contemporary biology. The dramatic cell differentiation from amoebae to flagellates is unique among eukaryotes in the rapidity, synchrony, reproducibility, homogeneity, and accessibility of major...

Author(s) : Fulton, C.

Journal article : Journal of Eukaryotic Microbiology 1993 Vol.40 No.4 pp.520-532 ref.74

22. Nucleoside transport in Crithidia luciliae.

Nucleoside transport was evaluated in Crithidia luciliae by a rapid sampling technique. C. luciliae was shown to possess 2 independent nucleoside transporters, one which transported adenosine, deoxyadenosine, tubercidin, sangivamycin and the pyrimidine nucleoside thymidine, while the second was...

Author(s) : Hall, S. T.; Odgers, G. A.; Gero, A. M.

Journal article : International Journal for Parasitology 1993 Vol.23 No.8 pp.1039-1044 ref.23

23. Biosynthesis of protein-linked oligosaccharides in trypanosomatid flagellates.

This article discusses the structure and biosynthesis of mammalian Asn-linked oligosaccharides and compares this with what is known in trypanosomatids under the headings: the structures of N-linked oligosaccharides; N-glycosylation of proteins; processing of N-linked oligosaccharides in the...

Author(s) : Parodi, A. J.

Journal article : Parasitology Today 1993 Vol.9 No.10 pp.373-377 ref.52

24. Inhibition of Acanthamoeba species by Pseudomonas aeruginosa: rationale for their selective exclusion in corneal ulcers and contact lens care systems.

Cocultivation of Acanthamoeba castellanii and A. polyphaga with live Pseudomonas aeruginosa and with broth filtrates of P. aeruginosa proved equally lethal to the Acanthamoeba spp. The P. aeruginosa-induced amoebicidal activity is apparently toxin mediated and has 2 operative modes: it can function ...

Author(s) : Qureshi, M. N.; Perez, A. A., II; Madayag, R. M.; Bottone, E. J.

Journal article : Journal of Clinical Microbiology 1993 Vol.31 No.7 pp.1908-1910 ref.16

25. Nitrogen metabolizing enzyme activities in the free-living soil amoebae Acanthamoeba castellanii, Acanthamoeba polyphaga and Hartmannella vermiformis.

A number of key enzymes involved in the nitrogen metabolism of axenically cultivated free-living soil amoebae (Acanthamoeba castellanii CCAP strain 1501/1B, A. polyphaga CCAP strain 1501/3C) and 2 different strains of Hartmannella vermiformis (ATCC strain 50236, and strain OS-101) were determined....

Author(s) : Weekers, P. H. H.; Drift, C. van der

Journal article : Journal of Eukaryotic Microbiology 1993 Vol.40 No.3 pp.251-254 ref.30