Nitrogen Fixation: Nitrogenase and Chemical Modelling
- Synopsis
- Concentrates on a suggested model for the operations of the two proteins of the nitrogenese enzyme which bacteria use to fix nitrogen. First shows how root modules of legumes possess nitrogen fixing bacteria, then how a bacterium is cultured and how proteins are extracted from it. There is a model for the nitrogenase operation, and a schematic illustration of the Chatt cycle for the nitrogen fixing process. This relates each step in the cycle to the progressive bonding of protons to a dinitrogen molecule, bound presumably at molybdenum, in the active site of the molybdo-protein. Dr Chris Pickett of the University of Sussex demonstrates his electrolytic cell which physically illustrates parts of the Chatt cycle, at room temperature and pressure. He adds a tungsten complex containing dinitrogen to the cathode compartment of the cell, into which dinitrogen is bubbling. By adding a source of protons (tosylic acid) he forms a hydrazine.
- Series
- S343 Videocassette 2
- Language
- English
- Country
- Great Britain
- Medium
- Video; Videocassette. Standard formats. col. 24 min.
- Year of production
- 1990
- Availability
- Sale
- Subjects
- Agriculture; Chemistry
- Keywords
- inorganic chemistry; legumes; nitrogen fixation; root nodules
Credits
- Producer
- Michael Peet
- Cast
Crawford Logan
Production Company
Distributor
- Name
Open University Worldwide
- Web
- http://www.ouw.co.uk External site opens in new window
- Phone
- +44 (0) 1908 274066
- Address
- Walton Hall
Milton Keynes
MK7 6AA - Notes
- NB. As of May 2016 Open University Worldwide are no longer distributing DVDs. They have posted this message on their website: ‘Unfortunately Open University Worldwide Limited has decided that product sales are no longer viable given the reduced funding to Higher Education institutions and diminishing demand for the products we have traditionally stocked. At present the Open University Students Association (OUSA) will continue to sell the "Good Study Guide", and we are in discussion with other possible distributors to continue to make The Open University’s products available for purchase. As soon as we have any information on other channels of distribution we will update this notice’. Some products are still available via second hand dealers on Amazon.co.uk
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