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- From: wastec@unpsun1.cc.unp.ac.za (Centre For Waste Technology)
- Newsgroups: bionet.software
- Subject: RE: INFORMATION ON MSc PROJECT
- Message-ID: <1993Jan7.130950.27713@gserv1.dl.ac.uk>
- Date: 7 Jan 93 13:09:49 GMT
- Sender: list-admin@daresbury.ac.uk
- Distribution: bionet
- Lines: 91
- Original-To: bio-soft@uk.ac.daresbury
- Original-Cc: wastec@ZA.AC.UND.CC.Bertha
- X-Mailer: ELM [version 2.3 PL11]
-
-
-
- Hello Great Wide World,
-
- REQUEST FOR INFORMATION ON IMAGE ANALYSIS AND BIOFILM FORMATION.
-
- Below is a summary of what I am doing for my
- "MASTERS OF THE UNIVERSE and other small and insignificant
- things......" theis.
-
- If anyone has any information they think could help me I would really
- appreciate it. Thank you in advance.
-
- To date, possibly due to methodological difficulties, no
- definitive studies of the role of surfaces in soil have been
- reported despite the fact that knowledge of this is central to
- the understanding of the importance of microorganisms to, for
- example, revegetation of landfill sites or in bioremediation.
-
- The central aim of this project is to establish
- methodologies appropriate for definitive fundamental studies in
- microecophsiology. Development of sampling techniques,
- microscopy and image analysis hardware and software, to determine
- the behaviour of both planktonic and surface-attached (biofilm
- forming) microorganisms in microecophysiological terms is central
- to the study. The first step is to establish methods for
- studying the "real time" processes (of both individual microbial
- and associations) of attachment, establishment, division and
- growth on surfaces in situ, under constant, standardised
- conditions. The second step will be to modify these methods for
- the study of microbial associations in situ.
-
- These methods will then be used to investigate the effects
- of landfill leachate on soil during vertical migration and the
- bioremediation of contaminated soil, which are two on-going
- research programmes in the International Centre for Waste
- Technology (Africa), University of Natal, Pietermaritzburg.
- Preliminary work has shown that two distinct microbial
- populations, growth rate independent (surface-attached) and
- growth rate dependent (planktonic) are significantly involved in
- the processes. Unfortunately, at present, there is no direct
- method available to determine the rate of growth and significance
- of the former population type and, thus, research progress has
- been restricted.
-
- In order to reduce the considerable number of variables that
- influence growth on surfaces, single associations will be used,
- growing in defined, controlled conditions of continuous culture
- microscopy units (CCMU) which are housed in a controlled
- environment incubator which has sections for anaerobic and
- aerobic environments. The strictly controlled environmental
- variables are temperature (30oC), substrate concentration, flow
- rate, pH, light intensity and oxygen partial pressure. The plan
- is to set-up the CCMU, prior to inoculation and, subsequently,
- monitoring of the growth of the associations.
-
- The analytical system consists of a microscope attached to a
- video camera which allows images of selected microorganisms to be
- stored for later analysis on a Vidas (Kontron) digital image
- analysis system. Images of morphologically distinguished
- microorganisms can be measured at preselected times and the
- values obtained used to accurately determine the growth rates of
- the species.
-
- Any suggestions on the topics I have mentioned would be greatly
- appreciated, no matter insignificant they might seem.
-
- Thanx in advance.
-
- Yours sincerely
- Barry Dudley
-
- #############################################################
-
- BARRY DUDLEY
- THE MASTERS OF THE UNIVERSE AND OTHER SMALL AND INSIGNIFICANT
- THINGS.......................................................
- International Centre for Waste Technology
- Department of Microbiology and Plant Pathology
- University of Natal
- PO Box 375
- Pietermaritzburg
- 3200
- South Africa
- Email wastec@unpsun1.cc.unp.ac.za
-
- ############################################################
-
-
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