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  • 1
    Electronic Resource
    Electronic Resource
    The pathology of Flexibacter maritimus in aquaculture species in Tasmania, Australia (1997)
    Oxford, UK : Blackwell Science Ltd
    Journal of fish diseases 20 (1997), S. 0 
    Details
    ISSN: 1365-2761
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Macroscopic and microscopic features of natural and experimental Flexibacter maritimus infection, and epidemiological aspects of the disease, have been reported in a number of species of fish in Tasmanian aquaculture including Atlantic salmon, Salmo salar L., rainbow trout, Oncorhynchus mykiss (Walbaum), greenback flounder, Rhombosolea tapirina Günther, and striped trumpeter, Latris lineata (Bloch & Schneider). There is a great deal of consistency in the pathology in salmonids and non-salmonid species, with erosive lesions of external surfaces being the most prominent clinical sign. Experimentally induced disease of salmonids and flounder is similar to natural infection. Mature lesions show dermal and gill erosion, with dermal bacterial invasion into the dense connective tissue and occasionally underlying musculature, but a remarkable lack of inflammatory response. The earliest lesions show consistent fragmentation and degeneration of the epithelium, with infiltration of amorphous protein-like materials and occasionally intra-epithelial cellular inflammatory cells, plus congestion and haemorrhage of the superficial dermis, but without visible bacteria in standard sections. Variable scale loss, oedema and a low level of inflammation in scale pockets, plus variable small adherent bacterial mats, are evident before full epithelial erosion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2761.1997.00288.x
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  • 2
    Electronic Resource
    Electronic Resource
    Biofilm Development on 304 and 316 Stainless Steels in a Potable Water System (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Water and environment journal 11 (1997), S. 0 
    Details
    ISSN: 1747-6593
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Instances of rapid failure of copper-pipe plumbing in potable-water systems installed in large municipal buildings have led to a review of the use of alternative materials including stainless steel. This paper reports the findings of an in-situ study which investigated biofilm development on types 304 and 316 stainless-steel piping in a filtered and unfiltered, hot and cold-water supply system installed in a large public building in the west of Scotland. This building had experienced severe corrosion problems with copper pipework.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1747-6593.1997.tb00131.x
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  • 3
    Electronic Resource
    Electronic Resource
    Clubbing and necrosis gill (CNG) syndrome in sea-caged Atlantic salmon, Salmo salar L., in Tasmania: an initial report (1997)
    Oxford BSL : Blackwell Science Ltd
    Journal of fish diseases 20 (1997), S. 0 
    Details
    ISSN: 1365-2761
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: In autumn 1993, an outbreak of gill disease occurred in Atlantic salmon, Salmo salar L., smolts farmed in the Huon estuary in southern Tasmania, Australia. Histologically, the presumptive primary lesion appeared as focal, sometimes full thickness, gill necrosis, which showed no host reaction in the initial stages. Healing of these damaged areas gave rise to conspicuous expanded tips or clubbing of gill filaments. The term clubbing and necrosis gill (CNG) syndrome is suggested to include both these histological features. Fusion of lamellae proximally along the filament, often with vascular dilation, was also a feature of the condition. Similar lesions have been described previously in the literature, but the initial necrosis followed by the very prominent clubbing of filaments was sufficiently different from previous descriptions to warrant designation of this condition as a distinct entity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2761.1997.d01-109.x
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  • 4
    Electronic Resource
    Electronic Resource
    INTESTINAL RESPONSE TO FEEDING HEAT DAMAGED CASEIN IN RATS (1980)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 45 (1980), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A previous study demonstrated that feeding rats a heat damaged casein diet caused a decrease in body weight and in the pancreatic content of chymotrypsin and amylase. However, the present study shows that leucine aminopeptidase (LAP) activity in the small intestinal mucosa is not affected by this dietary stress, indicating that the mucosa still has amino acids available for enzyme synthesis. The LAP activity of the mucosa did increase in response to feeding a meal probably due to an increase in the rate of synthesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1980.tb03897.x
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  • 5
    Electronic Resource
    Electronic Resource
    The effect of molybdenum on biofilm development (1999)
    Springer
    Journal of industrial microbiology and biotechnology 23 (1999), S. 112-117 
    Details
    ISSN: 1476-5535
    Keywords: Keywords: biofilms; stainless steel; potable water; bacteria; molybdenum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Little is known about the formation and effects of biofilms on stainless steel pipes in freshwater environments, particularly as they are considered as a direct replacement for copper pipes for ‘problem’ water. There is some cause for concern especially as stainless steel cannot claim the inherent biocidal potential of copper. As molybdenum is known to be leached out of stainless steel grade 316, in very small amounts, a study was set up to see if molybdenum could retard the development of biofilms. When a comparison of biofilm viable and total cell counts was made between pure molybdenum metal and stainless steel grade 304, it was found that cell counts were significantly higher (P 〈 0.05) on grade 304 stainless steel after 5 weeks exposure to flowing water (0.64 m s−1). Molybdenum (above a concentration of 1 g L−1) affected the growth rate of Acinetobacter sp, a pioneering bacterium of biofilms in potable water.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/sj.jim.2900712
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  • 6
    Electronic Resource
    Electronic Resource
    The effect of turbulent flow and surface roughness on biofilm formation in drinking water (1999)
    Springer
    Journal of industrial microbiology and biotechnology 22 (1999), S. 152-159 
    Details
    ISSN: 1476-5535
    Keywords: Keywords: biofilms; potable water; flow rate; stainless steel
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: There is considerable interest in both Europe and the USA in the effects of microbiological fouling on stainless steels in potable water. However, little is known about the formation and effects of biofilms, on stainless steel in potable water environments, particularly in turbulent flow regimes. Results are presented on the development of biofilms on stainless steel grades 304 and 316 after exposure to potable water at velocities of 0.32, 0.96 and 1.75 m s−1. Cell counts on slides of stainless steel grades 304 and 316 with both 2B (smooth) and 2D (rough) finishes showed viable and total cell counts were higher at the higher flow rates of 0.96 and 1.75 m s−1, compared to a flow rate of 0.32 m s−1. Extracellular polysaccharide levels were not significantly different (P〈 0.05) between each flow rate on all stainless steel surfaces studied. higher levels were found at the higher water velocities. the biofilm attached to stainless steel was comprised of a mixed bacterial flora including Acinetobacter sp, Pseudomonas spp, Methylobacterium sp, and Corynebacterium/Arthrobacter spp. Epifluorescence microscopy provided evidence of rod-shaped bacteria and the formation of stands, possibly of extracellular material attached to stainless steel at high flow rates but not at low flow rates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/sj.jim.2900622
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  • 7
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    Discovery of kpc-scale line emission in barred galaxies, not linked to AGN or star formation. (2015)
    Oxford University Press
    Details
    Publication Date: 2015-05-20
    Description: We present an analysis of the optical line emission from nearby barred galaxies, and in particular look at the radial range occupied by the bar. In many cases, this region is marked by what we term a ‘star formation desert’, with a marked deficit of H ii regions in optical narrow-band H α imaging. Here we present long-slit spectroscopy revealing that such regions do have line emission, but that it is low-level, spatially smooth and almost ubiquitous. The relative strengths of the H α and the spectrally adjacent [N ii ] lines in the regions are completely discrepant from those associated with star formation regions, and more closely match expectations for ‘LINER’ regions. We quantify the total line emission from these extended, kpc-scale regions, and determine the spurious contribution it would make to the determined star formation rate of these galaxies if interpreted as normal H α emission. We concur with previous studies that link this ‘LINER’ emission to old stellar populations, e.g. post-asymptotic giant branch stars, and propose strongly barred early-type spirals as a prime location for further tests of such emission.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 8
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    Stellar population constraints on the ages of galactic bars (2016)
    Oxford University Press
    Details
    Publication Date: 2016-01-29
    Description: We present a study of the stellar populations within the central regions of four nearby barred galaxies, and use a novel technique to constrain the duration of bar activity. We focus on the star formation ‘desert’, a region within each of these galaxies where star formation appears to have been suppressed by the bar. New Hβ spectroscopic data are presented, and used to produce spectroscopic line indices which are compared with theoretical predictions from population synthesis models for simple stellar populations and temporally truncated star formation histories. This analysis shows that the dearth of star formation activity in these regions appears to have been continuing for at least 1 Gyr, with time-scales of several Gyr indicated for two of the galaxies. This favours models in which strong bars can be long-lived features of galaxies, but our results also indicate a significant diversity in stellar population ages, and hence in the implied histories of bar activity in these four galaxies.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 9
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    Wavelet-based multiresolution analysis of Wivenhoe Dam water temperatures (2011)
    Wiley
    Details
    Publication Date: 2011-05-28
    Description: Water temperature measurements from Wivenhoe Dam offer a unique opportunity for studying fluctuations of temperatures in a subtropical dam as a function of time and depth. Cursory examination of the data indicate a complicated structure across both time and depth. We propose simplifying the task of describing these data by breaking the time series at each depth into physically meaningful components that individually capture daily, subannual, and annual (DSA) variations. Precise definitions for each component are formulated in terms of a wavelet-based multiresolution analysis. The DSA components are approximately pairwise uncorrelated within a given depth and between different depths. They also satisfy an additive property in that their sum is exactly equal to the original time series. Each component is based upon a set of coefficients that decomposes the sample variance of each time series exactly across time and that can be used to study both time-varying variances of water temperature at each depth and time-varying correlations between temperatures at different depths. Each DSA component is amenable for studying a certain aspect of the relationship between the series at different depths. The daily component in general is weakly correlated between depths, including those that are adjacent to one another. The subannual component quantifies seasonal effects and in particular isolates phenomena associated with the thermocline, thus simplifying its study across time. The annual component can be used for a trend analysis. The descriptive analysis provided by the DSA decomposition is a useful precursor to a more formal statistical analysis.
    Print ISSN: 0043-1397
    Electronic ISSN: 1944-7973
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 10
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    Photometric and spectroscopic observations, and abundance tomography modelling of the Type Ia supernova SN 2014J located in M82 (2014)
    Oxford University Press
    Details
    Publication Date: 2014-11-09
    Description: Spectroscopic and photometric observations of the nearby Type Ia Supernova (SN Ia) SN 2014J are presented. Spectroscopic observations were taken –8 to +10 d relative to B -band maximum, using FRODOSpec, a multipurpose integral-field unit spectrograph. The observations range from 3900 to 9000 Å. SN 2014J is located in M82 which makes it the closest SN Ia studied in at least the last 28 yr. It is a spectroscopically normal SN Ia with high-velocity features. We model the spectra of SN 2014J with a Monte Carlo radiative transfer code, using the abundance tomography technique. SN 2014J is highly reddened, with a host galaxy extinction of E ( B  –  V ) = 1.2 ( R V  = 1.38). It has a m 15 ( B ) of 1.08 ± 0.03 when corrected for extinction. As SN 2014J is a normal SN Ia, the density structure of the classical W7 model was selected. The model and photometric luminosities are both consistent with B -band maximum occurring on JD 245 6690.4 ± 0.12. The abundance of the SN 2014J behaves like other normal SN Ia, with significant amounts of silicon (12 per cent by mass) and sulphur (9 per cent by mass) at high velocities (12 300 km s –1 ) and the low-velocity ejecta ( v  〈 6500 km s –1 ) consists almost entirely of 56 Ni.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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