Paramecium is a unicellular organism that swims in fresh water by beating thousands of cilia. When it stimulated (mechanically, chemically, optically, thermally…), often backward then turns and forward again. This avoiding reaction triggered calcium-based action potential. For this reason, some authors have called swimming neuron. review summarizes current knowledge about the physiological basi...

Previous experiments on physical non-contact communication within same species gave rise to test for this type of communication also across the species border, which was the aim of the present study. It was found that autotrophic unicellular organisms (Euglena viridis), separated by cuvettes, affected the proliferation rate of heterotrophic unicellular organisms (Paramecium caudatum). Further, ...

K A P P A and several other types of symbiotic particles are found in various stocks of Paramecium aurelia; their characteristics have been reviewed extensively by SONNEBORN (1959) and more recently by PREER (1967). Many of these symbiotic particles enable the paramecium containing them to kill paramecia that lack them and to be themselves resistant to the killing activity of animals containing...

The cryptomonads are a group of unicellular algae that acquired photosynthesis through the engulfment of a red algal cell, a process called secondary endosymbiosis. Here, we present the complete plastid genome sequence of the secondarily nonphotosynthetic species Cryptomonas paramecium CCAP977/2a. The approximately 78 kilobase pair (Kbp) C. paramecium genome contains 82 predicted protein genes,...

The environment is rarely constant and organisms are exposed to spatial and temporal variation that will impact life-histories. It is important to understand how such variation affects the adaptation of organisms to their local environment. We compare the adaptation of populations of the ciliate Paramecium caudatum exposed to constant (23 °C or 35 °C) and temporally variable temperature environ...

1963. Does preformed structure play an essential role in cell heredity? In Allen, J. M., ed., The Nature of Biological Diversity, McCraw-Hill, New York, pp. 165-221. 1970. Methods in Paramecium research. Meth. Cell Physiol., 4: 241-339. 1974. Paramecium aurelia. In King, R. C., ed., Handbook of Genetics, Vol. 2, Plenum Press, New York, pp. 469-594. 1975. The Paramecium aurelia complex of fourte...

A method is described for the simultaneous treatment of 42 (or more) stocks of Paramecium, and their adaptation to growth in axenic culture. Samples of dense cultures of these ciliates growing with Enterobacter aerogenes are rendered bacteria-free by migration through 2 sets of tubes containing Adaptation Medium (Peters' salts solution, stigmaterol, vitamins, and autoclaved E. aerogenes). The 2...

Nano titanium dioxide (nTiO2) is the most abundantly released engineered nanomaterial (ENM) in aquatic environments. Therefore, it is prudent to assess its fate and its effects on lower trophic-level organisms in the aquatic food chain. A predator-and-prey-based laboratory microcosm was established using Paramecium caudatum and Escherichia coli to evaluate the effects of nTiO2. The surface inte...

This is the first report on the presence of P. biaurelia in Tasmania, an island that has probably never been investigated before for the occurrence of the P. aurelia species. P. tetraurelia was recorded in Brazil, another very poorly investigated country in terms of this species complex. New stands of P. biaurelia and P. tetraurelia were also recorded in Japan. We present data concerning the oc...