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  • 1
    Electronic Resource
    Electronic Resource
    Guest editorial (1992)
    Springer
    Transportation 19 (1992), S. 77-78 
    Details
    ISSN: 1572-9435
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02132831
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  • 2
    Electronic Resource
    Electronic Resource
    The evaluation of active bus-priority signal routes (1981)
    Springer
    Transportation 10 (1981), S. 89-90 
    Details
    ISSN: 1572-9435
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00165620
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  • 3
    Electronic Resource
    Electronic Resource
    The evaluation of active bus-priority signal routes (1980)
    Springer
    Transportation 9 (1980), S. 173-189 
    Details
    ISSN: 1572-9435
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract In an attempt to provide priority facilities for high occupancy vehicles, many cities have investigated or installed active bus priority signals at selected intersections. This paper describes one such installation at the intersection of Bell Street and Oriel Road in Heidelberg, Victoria, Australia. In particular, it describes the impact of the signals on bus performance levels and on non-priority traffic performance levels. An evaluation is performed taking account of the costs of the installation, the changes in the amount of fuel consumed and the changes in the perceived, budgeted delay of people passing through the intersection. Perceived, budgeted delay is defined so as to take account of the variability of delay and the perception of small delay changes. The evaluation at this site showed that, for various reasons, it was difficult to justify the priority signals at this isolated intersection. The evaluation is then extended to the concept of a route of bus priority signal intersections. A simple model is built to simulate the performance of such a priority route and the evaluation repeated. As a result of using perceived delay as a measure of performance, it is then shown that although the priority intersections along the route may not be individually justifiable, the priority route as a whole may show considerable net benefits. These benefits will occur given that there are greater than a critical number of priority intersections on the route. This critical number will depend on the assumptions made in the priority route model. It is concluded that re-evaluation of bus priority signal intersections along the lines suggested in the paper may yield a number of viable bus priority intersections and bus priority routes which were previously considered to be non-viable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00167129
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  • 4
    Electronic Resource
    Electronic Resource
    The effect of pyridoxine and pyridoxal on the circulatory response of rats to microwave irradiation (1965)
    Springer
    Cellular and molecular life sciences 21 (1965), S. 28-29 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Résumé L'administration intraveineuse de pyridoxine et pyridoxal (10 mg/kg) à des rats anesthésiés inhibe l'augmentation du rendement du cocur. En même temps, une hyperthermie est provoquée par l'irradiation du corps entier avec des ondes de longueur minime (2,450 Mc. c.w. 0.08/w/cm2). Cet effet peut être attribué à l'interaction de ces composés d'amines vasoactifs libérés pendant l'irradiation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02136365
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  • 5
    Electronic Resource
    Electronic Resource
    Hsp70 and aging (1994)
    Springer
    Cellular and molecular life sciences 50 (1994), S. 1092-1098 
    Details
    ISSN: 1420-9071
    Keywords: Aging ; liver ; transcription ; heat shock transcription factor ; rat ; senescence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract An alteration in the ability of cells to express heat shock proteins could be physiologically important in aging because all living organisms show a reduced ability to respond to stress with increasing age. Using hepatocytes freshly isolated from young adult and old rats, we have shown that the induction of hsp70 expression by heat shock is reduced approximately 50% with age. The decrease in hsp70 expression occurs at the level of transcription and appears to arise from a defect in the heat shock transcription factor. Other investigators have also shown that the induction of hsp70 expression by heat shock as well as other stresses declines significantly with age in a variety of tissues from rats as well as mononuclear cells from human subjects. In addition, a decrease in the inducibility of hsp70 is observed with cell senescence in cultured cells. Therefore, it appears that a reduced ability to express hsp70 in response to stress may be a common phenomenon underlying the aging process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01923466
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  • 6
    Electronic Resource
    Electronic Resource
    Comparison of transfer ribonucleic acid aminoacylation by various regions of chicken brain (1977)
    Springer
    Cellular and molecular life sciences 33 (1977), S. 601-602 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Aminoacylation of tRNA with valine was greater in the cerebrum of chicken than the cerebellum or optic lobes. This greater aminoacylation was due to both the activity of the cerebral valyl-tRNA synthetases and the accepting activity of the cerebral tRNAval.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01946522
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  • 7
    Electronic Resource
    Electronic Resource
    A photoisomerisation product of dieldrin (1966)
    Springer
    Bulletin of environmental contamination and toxicology 1 (1966), S. 127-132 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01844243
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  • 8
    Electronic Resource
    Electronic Resource
    Components of organic phosphorus in soil extracts that are hydrolysed by phytase and acid phosphatase (2000)
    Springer
    Biology and fertility of soils 32 (2000), S. 279-286 
    Details
    ISSN: 1432-0789
    Keywords: Key words Citric acid ; Organic phosphorus ; Phosphatase ; Phytase ; Soil phytate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract  Extracts were prepared from soil using water, 50 mM citric acid (pH ∼2.3) or 0.5 M NaHCO3 (pH 8.5), and were incubated with excess phytase from Aspergillus niger to determine the amounts of labile P. Two A. niger phytase preparations were used: (1) a purified form which exhibited a narrow substrate specificity and high specific activity against phytate; and (2) a commercial preparation (Sigma) with activity against a broad range of P compounds. A comparatively large proportion (up to 79%, or 5.7 μg g–1 soil) of the organic P (Po) extracted with citric acid was hydrolysed by the commercial phytase, while between 28% and 40% (up to 3.1 μg g–1 soil) was hydrolysed using purified phytase. By comparison, only small quantities of the Po in water and NaHCO3 soil extracts were enzyme labile. While extractable Po was increased both with increasing concentrations of citric acid (up to 50 mM) and increasing pH (pH 2.3–6.0), enzyme-labile P increased only with citric acid concentration. The labile component of Po in citric acid extracts from soils with contrasting fertiliser histories indicated that enzyme-labile Po is a relatively large soil P pool and is potentially an important source of P for plants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003740000249
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  • 9
    Electronic Resource
    Electronic Resource
    Food, feeding rates and assimilation in the land snail Cepaea nemoralis L. (1975)
    Springer
    Oecologia 19 (1975), S. 59-70 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The natural diet of a population of Cepaea nemoralis living in a sand dune system in southwest England was investigated by field observations and examination of crop and faeces contents. The food consisted of dead material from the commoner plants on the site. Very little green matter was eaten and there was little evidence for seasonal variation in the diet. Consumption and egestion rates were measured gravimetrically on natural foods (dead leaves of Taraxacum officinale and Ononis repens) and artificial foods. Consumption rates were temperature dependent over the measured range of 5–20°C and also varied with the food substrate, an artificial food (rat food pellets) being consumed at the highest rate. High variability in the results can probably be linked to the live weight and activity cycles of the snails. Assimilation was estimated as the difference between consumption and egestion, since a trial of the ash-ratio method proved unsuitable with this animal. Assimilation efficiency did not vary with temperature over the range studied, but was dependent on food substrate, the two artificial foods (rat food pellets and lettuce leaves) being assimilated more efficiently (71–73%) than natural foods (30–44%). Faeces produced from the digestive gland could be distinguished and were measured separately. The amount produced was very small compared to the gut faeces, but increased significantly when a relatively indigestible food was used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00377590
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  • 10
    Electronic Resource
    Electronic Resource
    Energy flux in a natural population of the land snail, Cepaea nemoralis L. (1975)
    Springer
    Oecologia 19 (1975), S. 141-164 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Energy flux in a population of Cepaea nemoralis L. living on a sand dune system was estimated in 1970 and 1971. Numbers and dynamics of the adults were studied by a capture-mark-recapture method, juveniles by quadrat sampling. Adult numbers were around a mean of 2.14 m-2 (mean annual biomass 14.7 kJ m-2 1970; 13.4 kJ m-2 1971). Eggs were laid in June, July and August and peak numbers of small juveniles (〈6 mm) were present in October (20.7 m-2 1970; 7.8 m-2 1971). Mortality rates of the small animals was high and in the following season (1971) density of the next size class (6–11 mm) was much lower (4.9 m-2). Mean annual biomass of the whole population was 17.0 kJ m-2 in 1970 and 16.4 kJ m-2 in 1971. Growth rates were slow and variable. Adult production was calculated as the yield to carnivores and scavengers plus the continuous mucus production which was almost half the total. Juvenile production was calculated from quadrat sampling data. Total population production was 34.3 kJ m-2 in 1970 and 25.9 kJ m-2 in 1971. Adult respiration was measured in an open flow respirometer with gas analysis by gas chromatograph. Measurements were made in 1971 on field acclimated animals. Juvenile respiration measurements were made in Warburg respirometers. Population respiratory losses were 62.8 kJ m-2 and 41.8 kJ m-2 in the 2 years. In the calculation of population respiration, allowance was made for low metabolic rates during periods of aestivation and hibernation. Population activity was reduced by 90% after 5 days without rain. Population consumption, was estimated at 316.6 kJ m-2 and 239.0 kJ m-2 and assimilation efficiencies were from 30–40% on natural foods. Annual energy budgets were constructed and energy flux (P+R) was 97.0 kJ m-2 in 1970 and 77.6 kJ m-2 in 1971. The plot of log respiration against log production fell lower than that for most long-lived poikilotherms due to the inflation of the production estimate by mucus production.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00369098
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