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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Atlantic economic journal 11 (1983), S. 63-69 
    ISSN: 1573-9678
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Notes: Conclusion This application of the B/T model indicates that, in the short run, rent control may be a rational choice for consumers and that, as a related point, the likelihood of finding rent control in a jurisdiction increases with the size of the rental sector of the housing market. However, in the long run, the community that chooses rent control will have a smaller supply of housing than it would have had [Marks, forthcoming], and it will have effected a sub-optimal allocation of resources; moreover, aside from the initial capital loss to investors, the welfare loss from the inefficiency will be borne by consumers, particularly permanent residents of the jurisdiction. It is likely that support for control will weaken over time as the long-run effects begin to materialize. This weakening would probably occur more rapidly as the proportion of non-transient renters in a jurisdiction increases. However, a complete consideration of this issue remains as a topic for further research.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The concept of the cold crucible is critically re-examined. In order to overcome some of the more serious limitations of the Hukin design, consideration is given to a return to the synthetic crucible; that is one put together from (identical) individual parts. The important features of such a crucible are compared and contrasted with those of one carved from the solid.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    ISSN: 1432-1041
    Keywords: amoxycillin ; pharmacokinetics ; bedrest ; sleep ; ambulation ; renal clearance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The pharmacokinetics of amoxycillin in normal male volunteers was studied during the states of bedrest, sleep and ambulation. The absorption and disposition of amoxycillin in ambulatory subjects was found to be comparable to that reported previously by other workers. Serum amoxycillin concentrations were found to be significantly greater during ambulation than during bedrest and sleep. The difference in serum levels resulted from an increased apparent total serum clearance and amoxycillin renal clearance during bedrest and sleep compared to ambulation. No significant differences in the clearance was found between the states of bedrest and sleep. The change in renal clearance of amoxycillin during ambulation was attributed to a diminished renal blood flow. Although the terminal half-life of amoxycillin did not differ significantly, the apparent volume of distribution appears to be much greater during bedrest and sleep than during ambulation. This difference could be explained pharmacokinetically using a two compartment model. No significant difference was found between the rates of absorption of amoxycillin as reflected by the lag time and time to peak serum amoxycillin. The actual values for these parameters would suggest, however, that the absorption of amoxycillin is faster during ambulation than in bedrest and that the absorption rate during sleep is slowest. The clinical implications of the effect of posture and sleep on the pharmacokinetics of amoxycillin are discussed.
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  • 4
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Using atomic absorption spectroscopy, exceptionally high concentrations of iron (778 to 82,363 μg g+1 dry weight) and zinc (219 to 4,183 μg g+1 dry weight) were detected in the livers of Dugong dugon (Müller) from north Queensland compared with reported values for other marine mammals from other areas of the world. Levels of copper (9.1 to 608 μg g+1 dry weight), cadmium (〈0.1 to 59 μg g+1 dry weight), cobalt (0.5 to 72 μg g+1 dry weight) and silver (0.2 to 39 μg g+1 dry weight) in the liver, and cadmium (0.2 to 209 μg g+1 dry weight) in the kidney were also relatively high in several samples, whilst concentrations of nickel, lead and chromium were consistently below the limits of detection in all tissues. Manganese concentrations, in all tissues examined, were generally comparable with those reported from other marine mammals. Tissue concentrations of a number of metals varied with the age of the dugong. Levels of iron, zinc, cadmium and cobalt in the liver zinc and cadmium in the kidney, and iron in the muscle were significantly positively correlated with age. Copper and manganese in both liver and kidney were negatively correlated with age. Large deposits of the iron-rich pigment, haemosiderin, the quantity of which also tended to increase with age, was a conspicuous feature of the livers of all the post-natal dugongs examined histologically. It seems unlikely that the unusual metal status of the dugong reflects anthropogenic activities, since many individuals were collected in remote areas far from major sites of urbanization and industrialization. Seagrasses, the major food of dugongs, were collected from various north Queensland dugong habitat-areas and analysed. Very high concentrations of iron but low levels of copper were detected. The significance of such dietary imbalances and their possible influence on the metal status of the dugong were therefore considered.
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  • 5
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Saccostrea echinata (Quoy and Gaimard) were exposed to 10 μg 1-1 of either mercury, cadmium or lead at 30 °C, 36‰S; 30 °C, 20‰S; 20°C, 36‰S and 20°C, 20‰S for 30 d and were then transferred to clean seawater for a further 30 d to depurate. Specimens were removed at regular intervals during the exposure and depuration periods, dissected into gills, mantle, visceral mass and adductor, and analysed for the appropriate metal by atomic absorption spectroscopy. Mercury was concentrated more than the other metals in all tissues under all conditions. Cadmium uptake was greater than lead in all tissue in the high-temperature experiments, whereas both metals were concentrated to similar extents at low temperature. The gill tissue generally accumulated the greatest amount of all 3 metals, whilst the adductor concentrated the least amount. At both salinities, mercury and cadmium accumulation by all tissues was significantly greater at the higher temperature whereas lead uptake was only marginally increased. The accumulation rates of mercury at high temperature were significantly greater in all tissues at low compared with high salinity, whereas at low temperature, differences were not significant. Accumulation rates of cadmium and lead in the majority of tissues examined were significantly greater in lowsalinity water at both temperatures. In general, lead was lost the most rapidly from oyster tissues, followed by mercury and then cadmium. The residence times for mercury and cadmium differed significantly between tissues, with the gills showing the highest turnover rate. In contrast, residence times for lead were similar between tissues. Losses of all 3 metals from oyster tissues were not obviously influenced by temperature and only mercury losses differed significantly between salinities.
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