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  • 1
    Electronic Resource
    Electronic Resource
    A proposal for a resonant opto-electronic optical logic device (1987)
    Springer
    Optical and quantum electronics 19 (1987), S. 265-268 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02032683
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  • 2
    Electronic Resource
    Electronic Resource
    Extraction of nitrogen from soils (1989)
    Springer
    Biology and fertility of soils 8 (1989), S. 189-190 
    Details
    ISSN: 1432-0789
    Keywords: Nitrogen ; Ammonium ; Nitrate ; Nitrogen extraction ; Soils ; Nitrogen mineralization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A roller bed and rotary end-over-end shaker were compared for the extraction of mineral N from a variety of soil types; both were equally efficient with an optimum extraction time of 30 min. However, the roller bed permitted a greater operational capacity, a faster throughput of samples, and easier identification of sample bottles compared with the end-over-end shaker. More NH4 +-N and NO3 −-N (P〈0.001) was recovered from soil by 2 M KCl than by any other extractant, in a soil: extractant ratio of 1 to 5 (w:v), except water, which was equally efficient at removing NO3 −-N from soils.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00257765
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  • 3
    Electronic Resource
    Electronic Resource
    Effects of water amendment on basal and substrate-induced respiration rates of mineral soils (1989)
    Springer
    Biology and fertility of soils 8 (1989), S. 242-246 
    Details
    ISSN: 1432-0789
    Keywords: Soil respiration ; Soil water ; Substrate-induced respiration ; CO2 evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary We studied the effects of amending soils with different volumes of water or glucose solution on respiration rates measured as CO2 evolution. Basal respiration was not significantly affected by the volume of water amendment, but substrate-induced respiration in static soil solutions was significantly reduced by increasing water contents. Inhibition of substrate-induced respiration was removed by continuously agitating the incubation vessels. Estimates of substrate-induced respiration rates for six soils differed markedly, depending on whether the vessels were stationary or agitated during the incubation. Agitation allowed increased discrimination between substrate-induced respiration rates for the soils, while static incubation only differentiated the soil with the highest substrate-induced respiration rate from the other soils.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00266486
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  • 4
    Electronic Resource
    Electronic Resource
    Nitrogen mineralization and water-table height in oligotrophic deep peat (1988)
    Springer
    Biology and fertility of soils 6 (1988), S. 141-147 
    Details
    ISSN: 1432-0789
    Keywords: Peat ; Water-table height ; N mineralization ; Ammonifiers ; Nitrate reducers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Peat cores, 0–60 cm depth, were taken on 14 occasions from three experimental plots where the water levels in the surrounding ditches had been artificially controlled for 14 years at 0, 20 and 50 cm below the surface. Numbers of aerobic and anaerobic ammonifying bacteria in the profile were significantly increased (P〈 0.05) by lowering the water level from 0 to 50 cm. These increases occurred mainly in the surface 20 cm horizon, where 80%–90% of the ammonifying bacteria in the profile occurred. Mineral N in fresh samples, which was present almost entirely as ammonium, decreased sharply with depth below 20 cm, and on two occasions concentrations were significantly greater (P〈0.05) in plots with water levels at 20 and 50 cm than in the flooded peat. Readily mineralized N, produced during waterlogged incubation at 30°C for 9 weeks, was significantly greater (P〈0.05) on eight occasions in samples from plots with water levels at 20 or 50 cm than in those where the water level was at the surface. Calculations showed that the increases in N availability as a result of lowering the water-table could be attributed mainly to deeper rooting.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00257664
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  • 5
    Electronic Resource
    Electronic Resource
    Freezing as a means of preserving samples in soil respiration studies (1989)
    Springer
    Biology and fertility of soils 8 (1989), S. 95-96 
    Details
    ISSN: 1432-0789
    Keywords: Soil respiration ; Substrate-induced respiration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Freezing was investigated as a means of preserving samples in soil respiration studies. Concentrations of CO2 in the headspaces of incubation bottles before and after freezing, and respiration rates derived from fresh or frozen samples were not significantly different over periods of up to 30 days. Freezing permits many samples to be assayed for respiratory activity at one time, increases the accuracy of the incubation period and defers the need to analyse headspace concentrations of CO2 until it is convenient.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00260523
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  • 6
    Electronic Resource
    Electronic Resource
    A null allele of esterase D is a marker for genetic events in retinoblastoma formation (1987)
    Springer
    Human genetics 〈Berlin〉 76 (1987), S. 33-36 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The development of homozygosity or hemizygosity in the 13q14 region by deletion, mitotic recombination, or chromosomal loss has been interpreted as a primary event in retinoblastoma. This finding is consistent with the hypothesis that inactivation of both alleles of a gene located at 13q14.11 is required for tumorigenesis. Observations reported by Benedict and colleagues in one case of bilateral retinoblastoma, LA-RB 69, provided early evidence in favor of this hypothesis. By examining levels of esterase D, an enzyme also mapping to 13q14.11, it was previously inferred that one chromosome 13 in this patient's somatic cells contained a submicroscopic deletion of the Rb and esterase D loci and that this chromosome was retained in her tumor while the normal chromosome 13 was lost. Using a rabbit anti-esterase D antibody and the esterase D cDNA probe, we have found that (1) low but detectable quantities of esterase D protein and enzymatic activity are present in tumor cells from LA-RB 69; (2) fibroblast from this patient contain two copies of the esterase D gene, indicated by heterozygosity at an ApaI polymorphic site within this gene; and (3) tumor cells from the same patient are homozygous at this site, indicating loss and reduplication of the esterase D locus. These results demonstrate that one of the two esterase D alleles in this patient acted as a “null” or silent allele — that is, was present in the genome with markedly decreased protein expression. This mutant allele acted as a marker for tumor-associated loss of chromosome 13 heterozygosity, in concordance with previous proposals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00283046
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  • 7
    Electronic Resource
    Electronic Resource
    Microspore growth and anther staging in barley anther culture (1986)
    Springer
    Plant cell reports 5 (1986), S. 47-49 
    Details
    ISSN: 1432-203X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Nuclear growth, microspore cell growth and cell cycle stage were examined in microspores of anthers of Hordeum vulgare L. cv. Klages taken from florets of the middle of the spike as per anther staging methods. Although there was wide variation in nuclear size at all stages of the cell cycle, mean nuclear size appeared to be a good indicator of cell cycle stage for microspores within anthers. Microspore cell size increased considerably during Gl of the cell cycle. Anthers bearing microspores cytologically characterized as in the mid-uninucleate stage, which have proven to yield high levels of callus production, were determined to be in G1 of the cell cycle and were regularly found in spikes taken from tillers in which the base of the flag leaf had emerged 0 to 3 cm above the penultimate leaf.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00269716
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  • 8
    Electronic Resource
    Electronic Resource
    Hydrogen dissociation below 1 K (1987)
    Springer
    Journal of low temperature physics 66 (1987), S. 277-304 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report on an investigation of hydrogen dissociation at dilution refrigerator temperatures. The objective of this study is to develop a low-temperature hydrogen atom source for experiments on spin-polarized atomic hydrogen. We find that, in a discharge tube coated with a solid H2 layer and a superfluid He film, hydrogen dissociation is mediated by a glow discharge supported by He vapor. The He discharge provides the energetic particles needed for removing H atoms from the solid H2 coating. In order to strike a He discharge, the He vapor pressure has to correspond to a wall temperature of 0.60–0.75 K. The best results are obtained close to the low-temperature threshold for ignition, or at even lower temperatures if the rf discharge pulse is preceded by a heat pulse adjusted to flash-evaporate the required initial He density. Hydrogen atom yields of 1013 H/discharge pulse are typical, and scale with the pulsed rf energy as long as the discharge volume is not overheated and remains in good thermal contact with its cooling jacket. In these conditions the H flux from the dissociator is proportional to the average rf power with a dissociation efficiency of ∼3%. With a dilution refrigerator circulation of 0.3 mmole/sec of3He, H fluxes of 5×1013 H/sec are obtained in steady-state discharge conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00682258
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  • 9
    Electronic Resource
    Electronic Resource
    Oscillatory convection in a dilute3He-superfluid4He solution (1985)
    Springer
    Journal of low temperature physics 59 (1985), S. 305-345 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Convective instabilities in a rectangular, unity-aspect-ratio Rayleigh-Bénard cell with a solution of 1.46%3He in superfluid4He have been studied in the temperature range 0.70–1.05 K, with a corresponding Prandtl number range of 0.045〈σ〈0.15. The onset of stationary convection is much like that in a classical, one-component fluid. The oscillatory instability is studied by using an extremely sensitive local temperature probe. It is found that the total heat transport efficiency is suppressed by the oscillations in the entire range of Prandtl number we have studied. The local temperature probe indicates a striking difference in the oscillatory amplitude when the sense of rotation of the convective rolls is reversed. The magnitude of the convective velocity is deduced from both the initial slope of the Nusselt number near the onset of the stationary convection and the frequency of the oscillations. Determinations of the temperature dependence of the convective velocity using these two methods agree very well. The observed behavior of the oscillatory frequency and onset condition supports the theory of oscillatory convection for a classical, low-Prandtl-number, one-component fluid.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00683781
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  • 10
    Electronic Resource
    Electronic Resource
    Evaluation of some quality characteristics in cassava storage roots (1985)
    Springer
    Plant foods for human nutrition 35 (1985), S. 121-129 
    Details
    ISSN: 1573-9104
    Keywords: cassava ; root quality ; plant age ; post harvest deterioration ; root starch content ; cooking evaluations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The susceptibility to physiological deterioration and the hardness (penetration) of fresh peeled cassava roots as well as the cooking time, taste and texture of cooked roots of four (one local and three promising) cultivars at four plant ages (6, 8, 10 and 12 months) were evaluated. Variety or cultivar, plant age and their interactions significantly affected all these parameters. Roots produced by the local cultivar (M Col 113) had lower DM contents and susceptibility to physiological deterioration, a longer cooking time and higher penetration measurements than the promising cultivars. Physiological deterioration and penetration values tended to decrease, whereas cooking time increased as the plants became older. The variation in correlation coefficients between quality and chemical parameters among the different cultivars was substantial, with no correlation being significant in all four cultivars. The experimental results demonstrate the great variability among cassava cultivars in the root quality factors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01092127
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