Growth rates (µ) of abundant microzooplankton species were examined in field experiments conducted at ambient sea temperatures (-1.8-9.0°C) in the Barents Sea and adjacent waters (70-78.5°N). The maximum species-specific µ of ciliates and athecate dinoflagellates (0.33-1.67 d(-1) and 0.52-1.14 d(-1), respectively) occurred at temperatures below 5°C and exceeded the µmax predicted by previously ...

Symbiotic photosynthesis of the colonial ciliate Ophrydium versatile from transparent temperate lakes was studied with 0, microelectrodes and measurements of 0, and C exchange in laboratory and field incubations. Oxygen gradients were steep just above the colony surface and shallow toward the center of the colony, reflecting that 0, metabolism is high in the peripheral layer containing the cili...

PROBLEMS OF MORPHOGENESIS IN CILIATES. THE KINETOSOMES IN DEVELOPMENT, REPRODUCTION AND EVOLUTION. By Andre Lwoff. New York, John Wiley & Sons, 1950. 103 pp. $2.50. This book consists of two parts: first, detailed observations on the behavior of the blepharoplasts in ciliates; and, second, an attempt to relate these observations to current speculations on the regulatory mechanisms guiding cell ...

We developed a fast and simple protocol for accurate quantification of small freshwater ciliates by flow cytometry (FCM). The ciliates were stained with several nucleic acid stains such as TO-PRO-1, YO-YO-1 and PicoGreen, and analysed by a commercially available flow cytometer. The method was tested with cultures of the prostomatid species Urotricha farcta and Balanion planctonicum, including t...

PROBLEMS OF MORPHOGENESIS IN CILIATES. THE KINETOSOMES IN DEVELOPMENT, REPRODUCTION AND EVOLUTION. By Andre Lwoff. New York, John Wiley & Sons, 1950. 103 pp. $2.50. This book consists of two parts: first, detailed observations on the behavior of the blepharoplasts in ciliates; and, second, an attempt to relate these observations to current speculations on the regulatory mechanisms guiding cell ...

Tetrahymena thermophila is the best studied of the ciliates, a diversified and successful lineage of eukaryotic protists. Mirroring the way in which many metazoans partition their germ line and soma into distinct cell types, ciliates separate germ line and soma into two distinct nuclei in a single cell. The diploid, transcriptionally silent micronucleus undergoes meiosis and fertilization durin...

Hypotrichous ciliates collected in the plankton and soil samples from a temporary pond in Buenos Aires province, Argentina, were characterized after live observations and protargol impregnation. Apoamphisiella hymenophora (Stokes) Berger is redescribed and the neotype material deposited. Apoamphisiella hymenophora differs from its congeners in having 2 macronuclear nodules, 1 contractile vacuol...