Picture of smart phone in human hand

World leading smartphone and mobile technology research at Strathclyde...

The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by University of Strathclyde researchers, including by Strathclyde researchers from the Department of Computer & Information Sciences involved in researching exciting new applications for mobile and smartphone technology. But the transformative application of mobile technologies is also the focus of research within disciplines as diverse as Electronic & Electrical Engineering, Marketing, Human Resource Management and Biomedical Enginering, among others.

Explore Strathclyde's Open Access research on smartphone technology now...

Physiological aspects of free and immobilised aspergillus niger cultures producing citric acid under various glucose concentrations

Papagianni, M. and Mattey, M. (2004) Physiological aspects of free and immobilised aspergillus niger cultures producing citric acid under various glucose concentrations. Process Biochemistry, 39 (12). pp. 1963-1970. ISSN 1359-5113

Full text not available in this repository. (Request a copy from the Strathclyde author)

Abstract

Similarities and differences between cultures of free and immobilized Aspergillus niger were identified under various glucose concentrations. Growth and citric acid production rates were compared, and the macro-morphology and fine structure of the mycelia examined to determine which parameters were significant in the production of citric acid. With free cultures the diameter of pellets was inversely related to glucose concentration, while biomass levels were lower for immobilized cultures than the equivalent free cultures. Rates of citric acid production were higher with immobilized mycelium, especially at higher glucose levels. The morphology that characterized high citric acid productivity was that of swollen hyphal tips which were seen at concentrations over 100 kg/m3 glucose in both free and immobilized mycelium. Although there is a characteristic morphology associated with high productivity it does not account for the difference observed between free and immobilized mycelia. The increased glucose uptake and productivity was not due to an increased surface area either, since the immobilized system was slightly lower in total surface area than the equivalent free cultures. The major difference was in the mean diffusion path in the two systems.