Despite growing interest in ecological consequences of parasitism in food webs, relatively little is known about effects of parasites on long-term population dynamics of non-host species or about whether such effects are density or trait mediated. We studied a tri-trophic food chain comprised of (i) a bacterial basal resource (Serratia fonticola), (ii) an intermediate consumer (Paramecium cauda...

We studied species coexistence in a protist community consisting of a bacterial resource, five protist consumers, and an intraguild predator, Blepharisma americanum. Spatial heterogeneity was manipulated by constructing spatial arrays of interlinked bottles. In the heterogeneous treatment species were permitted to disperse naturally between bottles whereas in the homogenous treatment half the w...

N TYPICAL biotypes of the Johns Hopkins stock R of P. aurelia, I SONNEBORN (1936) has shown that, when surplus animals from isolation lines are collected in a small mass culture and placed a t 31OC, conjugation invariably occurs if the animals have recently been through a nuclear reorganization (that is, endomixis or conjugation), but never a t other times. In the present paper we contrast the ...

Polyubiquitin genes from seven ciliate species were amplified, cloned and sequenced. It is estimated that Strombidium sulcatum, Euplotes vannus, E. rariseta and Anteholosticha manca have a polyubiquitin gene of 3 repeats, and A. parawarreni, Paramecium caudatum and Pseudokeronopsis flava 4 repeats. The newly obtained ubiquitins mostly differ from that of humans by 1-5 residues in amino acid seq...

Aim. To select the concentration of fennel essential oil as an antimicrobial component and amaranth antioxidant in composition a wound healing ointment for therapy second third phases process. Materials methods. The study objects were model samples with lipophilic extract marigold, oil. antibacterial antifungal activity was determined experiments vitro by agar diffusion method. properties perfo...