摘要:

Corrosion inhibition of steel (ASTM A619) by two marine isolates,Pseudomonassp.S9 andSerratia marces‐censEF190, was investigated by weight loss measurements of metal coupons placed in static batch cultures. Artificial seawater with (VNSS) and without (NSS) nutrients was used. The effects of bulk‐ and surface localised cells were compared. Adhesion of cells to the metal surface was quantified microscopically.

ISSN:0892-7014    

DOI:10.1080/08927019109378157

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

The algal flora and biomass of 3 industrial cooling systems (coke, chemical and tube rolling works) in the Ukraine, USSR have been examined. The parameters of these systems and their influence on algal fouling are discussed. Lists of the algae, biomass values, oxygen balance, the spatial and temporal variation of the algae as well as a comparison with the source rivers are given.

ISSN:0892-7014    

DOI:10.1080/08927019109378158

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

Colonization of glass substrata by populations of three or four bacterial species over periods of 4 weeks or more was investigated using recirculating, model laboratory systems. Numbers of a coryneform,Aeromonas hydrophila, Pseudomonas fluorescens, andXanthomonas maltophiliaon surfaces and in the liquid phase were monitored to determine whether any species inhibited or facilitated the colonization by another organism. Each system contained 800 ml of culture in a peptone/yeast extract/artificial lakewater medium, pulse‐fed every 3 days, and recirculated at 12 ml·min−1. Numbers of each species in the liquid phase and in biofilms that had been removed from the surfaces and dispersed were determined by viable counts on differential media. Biofilm coverage was evaluated by computer‐enhanced microscopy. The coryneform quickly colonized the surfaces, and there was little change in suspended or attached numbers over the experimental period. Colonization byA. hydrophilaincreased in the presence ofP. fluorescens. X. maltophiliawas a highly adhesive strain and promoted microcolony formation on the surface. The influence of nutrient concentration on colonization was determined by testing media at 10−2, 10−1, and 10−1dilutions of the standard concentration. The relative proportions of species both in the liquid and on surfaces altered with different nutrient concentrations, and with increase in nutrient concentration, there was a greater increase in total numbers of bacteria in the liquid (ranging from 7·7 × 106.ml−1to 1·7 × 1010.ml−1) than on the surfaces (ranging from 6·3 × 105.cm−2to 1·2 × 101.cm2). The results indicated that the ability of bacteria to colonize surfaces is to a large extent related to their ability to colonize the liquid phase. However, when a species has strong adhesive characteristics, this can result in relatively greater colonization of surfaces. In addition, synergistic interspecies interactions may allow a poor colonizer to become established.

ISSN:0892-7014    

DOI:10.1080/08927019109378159

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

The controlled release of an isothiazolone fungicide, C9211 (4,5‐dichloro‐2‐(n‐octyl)‐3(2H)‐isothiazolone) from a urethane oil paint is described. Leaching experiments showed that the amount of C9211 in the leachates was proportional to the loading in the paint. Paints containing 8% C9211 in the undercoat but none in the topcoat released C9211 in the same amounts as paints containing 4% C9211 in both undercoat and topcoat and the field performance of both paint combinations were identical. These results indicate that the C9211 is able to migrate through the urethane oil matrix replenishing any lost from the surface and thus giving effective antifungal control as long as biocide remains in the bulk of the paint.

ISSN:0892-7014    

DOI:10.1080/08927019109378160

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

Biofilm formation on 304 stainless steel (S30400) does not necessarily result in an ennoblement of the corrosion potential. Instead, biofilms composed of aerobic and anaerobic bacteria from Gulf of Mexico water formed an anaerobic biofilm/metal interface and caused the corrosion potential to move in the negative direction. Biofilms from the same source containing photosynthetic diatoms in the presence of light produced aerobic biofilm/metal interfaces and a positive shift (ennoblement of the corrosion potential). Corrosion potentials of stainless steels exposed in natural seawater cannot be predicted without an understanding of the composition of the biofilm and its impact on interfacial chemistry. In this paper, measurements of corrosion potential, interfacial pH and dissolved oxygen have been correlated with SEM/EDAX surface analyses to evaluate the electrochemical behaviour of stainless steels exposed to Gulf of Mexico water. The interfacial chemistries that influence the corrosion potential are also discussed.

ISSN:0892-7014    

DOI:10.1080/08927019109378161

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

An analytical investigation of the degradation of the biocide zineb (zinc ethylenebisdithiocarbamate) in Guillard's F2 marine culture medium over 96 h showed the formation of 5,6‐dihydro‐3H‐imidazo (2,1‐c)‐1,2,4‐dithiazole‐3‐thione (DIDT) and ethylene thiourea (ETU). In the presence of copper, over 24 h, HPLC analysis showed a compound with an identical retention time to ethylene diisothiocyanate (EDI).

ISSN:0892-7014    

DOI:10.1080/08927019109378162

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

Shewanella colwelliana, a marine bacterium which grows in association with oysters, has been found to produce an unusual extracellular polymer which mediates irreversible adhesion of the bacterium to surfaces. Production of the polymer was enhanced when the bacterium was grown on marine agar, overlaid with a dialysis membrane, and seeded with a liquid suspension of the cells. Purified exopolymer was shown to contain Ca, S, P and Si (40–45%), lipid (10%), carbohydrate (15–35%) and protein (<5%). Glucose was the predominant component of the carbohydrate moiety. Uronic acids were not detected. The exopolymer forms a loose capsule that surrounds the bacterium, demonstrated by light and electron microscopy.

ISSN:0892-7014    

DOI:10.1080/08927019109378163

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

ISSN:0892-7014    

DOI:10.1080/08927019109378156

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor