Credit: GERD GUENTHER/SCIENCE PHOTO LIBRARY

Caption: Paramecium caudatum cells out of a culture showing the behavior of the individuals when stained yeast is applied to the culture medium under the coverglass. Paramecium is a filter feeder and mainly feeds on bacteria. Paramecium is not able to make a food selection, so all kind of particles were ingested and packed into food vacuoles, in this case stained yeast cells. The yeast was stained with Congo red, a pH indicator to show the pH inside the food vacuoles during the digestion period. Several research articles describe the different stages of food vacuoles during the digestion process. Within 5 min of formation, the pH within the vacuole dropped from approximately 7 to 3, indicated by a change of color of Congo-red from red to blue. This clip was taken about 10 min after the application of the yeast suspension, showing all stages of food vacuoles. Microscopic contrast technique: Differential interference contrast.. Captured field width: 0.3mm.

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Keywords: animal, aquatic, behavior, biological, biology, cilia, ciliate, ciliophora, cilium, congo-red, dic, differential interference contrast, digestion, fauna, feeding, food vacuole, freshwater, invertebrate, light, light microscope, lm, locomotion, micro-organism, micro-organisms, microbiological, microbiology, microorganism, microscope, microscopy, motile, nature, paramecium, paramecium caudatum, ph, ph indicator, pond life, protozoa, protozoan, single-celled, stained yeast, swim, swimming, unicellular, wildlife, yeast, zoological, zoology

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Paramecium fed on stained yeast

K006/8702 Rights Managed

Downloadable master

Duration: 00:00:29.17

Frame size: 1920x1080

Frame rate: 24

Audio: No

Format: QuickTime, Photo JPEG 100%, progressive scan, square pixels

File size: 1.1G

Original

Capture format: Blackmagic Micro Studio Camera 4K

Frame size: 3840x2160

Codec: GoPro Cineform

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