Learning on ScreenPlasmolysis and Cytorrhysis
- Synopsis
- Shows the principles of plasmolysis: the movement of water from plant tissue after application of a hypertonic solution, the detachment of the living protoplast from the cell wall, the reversibility of plasmolysis, the variation in effects from different plasmolytica on protoplast form, the formation of Hecht’s strands, and the demonstration of the thin protoplasmic layer which lines the cell wall and cannot be seen. Plasmolysis is used to test cell vitality after irradiation with ultraviolet light. Cytorrhysis of moss cells is shown. It can be caused by dehydration or by the action of hypertonic solutions which contain molecules too large to permeate the cell wall. In both cases, the flexible, thin outer cell walls depress inwards and finally lie flat against each other in the centre of the cell.
- Language
- English
- Country
- Germany
- Medium
- Film; Video; Film. 16mm. sd. col. 12 min. Videocassette. Standard formats. col. 12 min.
- Technical information
- Black-and-white / Sound
- Year of production
- 1972-4
- Availability
- Hire (film - HEFVL)
Sale (video - BUFVC); 1996 sale: £20.00 (+VAT +p&p) - Uses
- 1st-year courses in botany and plant biology.*
- Subjects
- Biology
- Keywords
- physiology - plant; plasmolysis
Credits
- Director
- Hans-Karl Galle; W Url
Distribution Formats
- Type
- Film
- Format
- 16mm
Production Company
Distributor
- Name
Higher Education Film & Video Library
- services@bufvc.ac.uk
- Web
- http://bufvc.ac. External site opens in new window
- Phone
- 020 7393 1503
- Fax
- 020 7393 1555
- Address
- c/o British Universities Film & Video Council
77 Wells Street
London
W1T 3QJ - Notes
- Catalogue available from British Universities Film & Video Council.
- Name
Learning on Screen - the British Universities and Colleges Film and Video Council
- services@bufvc.ac.uk
- Web
- http://bufvc.ac.uk External site opens in new window
- Phone
- 020 3743 2345
- Address
- York House
221 Pentonville Road
London
N1 9UZ - Notes
- The Learning on Screen distribution library is currently only available in part. Please contact us with any individual queries. The two series of InterUniversity History Film Consortium films which make extensive use of archive footage been digitised for free, online viewing by UK HE institutions - see Learning on Screen InterUniversity History Film Consortium Films (qv).
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