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Membrane properties of exopolymeric substances
Abstracts
129
Scanning Electron Microscopy Study of SRB Adherence on Cathodically Protected Stainless Steel
Membrane Properties of Exopolymeric Substances
S.G.G. De Saravia, M.F.L. De Mele and H.A. Videla
Institute Superior Tecnico, Lisbon, Portugal
Bioelectrochemistry Argentina
Abstract not received.
Section, INIFTA,
University of La Plata,
C.A.C. Sequeira
The interactions between cathodic protection (CP) and anaerobic biotilms of mixed sulphate reducing bacteria (SRB) on AISI 304L stainless steel (SS) were studied using scanning electron microscopy (SEM) and occasionally through energy dispersion X-ray analyses (EDXA). SS samples were protected by applying -0.7 and -0.9 V potential levels during different exposure periods ranging between 3 h and 14 days. According to our results, the number of attached SRB did not decrease when CP was applied on SS coupons. These results differ from those obtained with aerobic bacterial biofilms. Under CP, biotilm structural characteristics were different from those formed on SS without protection as shown by SEM. Inorganic deposits were also modified by the biological activity. Pitting attack was observed for both protected and unprotected samples when SRB were present.
Goals and Content of CYTED-D Scientific Cooperation Program. CYTED XV: Biocorr Information Net for Biocorrosion and Biofouling in Industrial Systems
Microbial Flora of Deteriorated Varnished Wood
CYTED-D is an international programme aimed at the development of applied science in Iberoamerica, SubXV is entitled Corrosion/Environmental programme Impact on Metals, and within this subprogramme the BIOCORR network deals with biologically associated corrosion and biofouling in industrial systems. Members of the network have been separated into three action zones: MERCOSUL (Argentina, Brazil, Uruguay), Caribbean (Columbia, Cuba, Mexico, Venezuela) and Iberian Peninsula (Spain, Portugal). The MERCOSUL group is currently preparing various sections of a practical manual on microbial corrosion & biofouling and is collecting information for a databank (BIODAT), which will include information on the area: research centres, firms, products & services, publications, symposia, scientific meetings and relevant societies.
A.G. De Souza and C.C. Gaylarde Departamento
Solos, UFRGS, Porto Alegre, RS, Brazil
Deteriorated varnished wood panels, which had been subjected to open-air exposure in Gravatai, RS, Brazil, for more than two years, were sampled by scraping into sterile distilled water and by the adhesive tape technique. Direct microscopy on the adhesive tape samples showed the presence of algae and fungi. Scrapings plated on to appropriate solid growth media revealed the presence of tilamentous fungi (Fusarium and Aspergillus, amongst others), pink, black and white yeasts and bacteria of the genera Bacillus and Corynebacterium. One type of Gram negative rod was isolated. The major colonizers were yeasts and Gram positive bacilli. Further tests and attempted isolations of algae are under way.
H.A. Videla INIFTA,
Universidad de La Plata, Argentina
No abstract available.
Present Development of Biocorr in the Latin American Countries of Mercosul M.F.L. De Mele, C.C. Gaylarde and M.D. Ferrari INIFTA, Universidad de La Plata, Argentina, Facultad Agronomia, UFRGS, Porto Alegre, RS, Brazil and ANCAP, Pando, Canelones, Uruguay
129
Scanning Electron Microscopy Study of SRB Adherence on Cathodically Protected Stainless Steel
Membrane Properties of Exopolymeric Substances
S.G.G. De Saravia, M.F.L. De Mele and H.A. Videla
Institute Superior Tecnico, Lisbon, Portugal
Bioelectrochemistry Argentina
Abstract not received.
Section, INIFTA,
University of La Plata,
C.A.C. Sequeira
The interactions between cathodic protection (CP) and anaerobic biotilms of mixed sulphate reducing bacteria (SRB) on AISI 304L stainless steel (SS) were studied using scanning electron microscopy (SEM) and occasionally through energy dispersion X-ray analyses (EDXA). SS samples were protected by applying -0.7 and -0.9 V potential levels during different exposure periods ranging between 3 h and 14 days. According to our results, the number of attached SRB did not decrease when CP was applied on SS coupons. These results differ from those obtained with aerobic bacterial biofilms. Under CP, biotilm structural characteristics were different from those formed on SS without protection as shown by SEM. Inorganic deposits were also modified by the biological activity. Pitting attack was observed for both protected and unprotected samples when SRB were present.
Goals and Content of CYTED-D Scientific Cooperation Program. CYTED XV: Biocorr Information Net for Biocorrosion and Biofouling in Industrial Systems
Microbial Flora of Deteriorated Varnished Wood
CYTED-D is an international programme aimed at the development of applied science in Iberoamerica, SubXV is entitled Corrosion/Environmental programme Impact on Metals, and within this subprogramme the BIOCORR network deals with biologically associated corrosion and biofouling in industrial systems. Members of the network have been separated into three action zones: MERCOSUL (Argentina, Brazil, Uruguay), Caribbean (Columbia, Cuba, Mexico, Venezuela) and Iberian Peninsula (Spain, Portugal). The MERCOSUL group is currently preparing various sections of a practical manual on microbial corrosion & biofouling and is collecting information for a databank (BIODAT), which will include information on the area: research centres, firms, products & services, publications, symposia, scientific meetings and relevant societies.
A.G. De Souza and C.C. Gaylarde Departamento
Solos, UFRGS, Porto Alegre, RS, Brazil
Deteriorated varnished wood panels, which had been subjected to open-air exposure in Gravatai, RS, Brazil, for more than two years, were sampled by scraping into sterile distilled water and by the adhesive tape technique. Direct microscopy on the adhesive tape samples showed the presence of algae and fungi. Scrapings plated on to appropriate solid growth media revealed the presence of tilamentous fungi (Fusarium and Aspergillus, amongst others), pink, black and white yeasts and bacteria of the genera Bacillus and Corynebacterium. One type of Gram negative rod was isolated. The major colonizers were yeasts and Gram positive bacilli. Further tests and attempted isolations of algae are under way.
H.A. Videla INIFTA,
Universidad de La Plata, Argentina
No abstract available.
Present Development of Biocorr in the Latin American Countries of Mercosul M.F.L. De Mele, C.C. Gaylarde and M.D. Ferrari INIFTA, Universidad de La Plata, Argentina, Facultad Agronomia, UFRGS, Porto Alegre, RS, Brazil and ANCAP, Pando, Canelones, Uruguay