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  • 1
    Electronic Resource
    Electronic Resource
    The nitrogen balance of Raphanus sativus x raphanistrum plants. II. Growth, nitrogen redistribution and photosynthesis under NO3− deprivation (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 11 (1988), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract. Wild radish plants deprived of, and continuously supplied with solution NO−3 for 7 d following 3 weeks growth at high NO−3 supply were compared in terms of changes in dry weight, leaf area, photosynthesis and the partitioning of carbon and nitrogen (NH2-N and NO−3-N) among individual organs. Initial levels of NO−3-N accounted for 25% of total plant N. Following termination of NO−3 supply, whole plant dry weight growth was not significantly reduced for 3 d, during which time plant NH2-N concentration declined by about 25% relative to NO−3-supplied plants, and endogenous NO−3-N content was reduced to nearly zero. Older leaves lost NO−3 and NH2-N, and roots and young leaves gained NH2-N in response to N stress. Relative growth rate declined due both to decreased net assimilation rate and a decrease in leaf area ratio. A rapid increase in specific leaf weight was indicative of a greater sensitivity to N stress of leaf expansion compared to carbon gain. In response to N stress, photosynthesis per unit leaf area was more severely inhibited in older leaves, whereas weight-based rates were equally inhibited among all leaf ages. Net photosynthesis was strongly correlated with leaf NH2-N concentration, and the relationship was not significantly different for leaves of NO3−-supplied compared to NO−3-deprived plants. Simulations of the time course of NO−3 depletion for plants of various NH2-N and NO−3 compositions and relative growth rates indicated that environmental conditions may influence the importance of NO−3 accumulation as a buffer against fluctuations in the N supply to demand ratio.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3040.1988.tb01160.x
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  • 2
    Electronic Resource
    Electronic Resource
    The nitrogen balance of Raphanus sativus X raphanistrum plants. I. Daily nitrogen use under high nitrate supply (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 8 (1985), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Growth-chamber cultivated Raphanus plants accumulate nitrate during their vegetative growth. After 25 days of growth at a constant supply to the roots of 1 mol m−3 (NO−3) in a balanced nutrient solution, the oldest leaves (eight-leaf stage) accumulated 2.5% NO−3-nitrogen (NO3-N) in their lamina, and almost 5% NO3-N in their petioles on a dry weight basis. This is equivalent to approximately 190 and 400 mol−3 m−3 concentration of NO−3 in the lamina and the petiole, respectively, as calculated on a total tissue water content basis. Measurements were made of root NO−3 uptake, NO−3 fluxes in the xylem, nitrate uptake by the mesophyll cells, and nitrate reduction as measured by an in vivo test. NO−3 uptake by roots and mesophyll cells was greater in the light than in the dark. The NO−3 concentration in the xylem fluid was constant with leaf age, but showed a distinct daily variation as a result of the independent fluxes of root uptake, transpiration and mesophyll uptake. NO−3 was reduced in the leaf at a higher rate in the light than in the dark. The reduction was inhibited at the high concentrations calculated to exist in the mesophyll vacuoles, but reduction continued at a low rate, even when there was no supply from the incubation medium. Sixty-four per cent of the NO−3 influx was turned into organic nitrogen, with the remaining NO−3 accumulating in both the light and the dark.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/1365-3040.ep11611835
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  • 3
    Electronic Resource
    Electronic Resource
    Identifiability of DNA distribution from flow cytometric data with cell debris (1988)
    Springer
    Bulletin of mathematical biology 50 (1988), S. 209-225 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract In flow cytometric measurement of cell DNA distribution one of the major problems is accounting for the effect of fragmentation in the staining process. This work considers a recent probabilistic model that has been proposed for the fragmentation process and species under which conditions it is possible to uniquely identify the DNA distributions of the original population using flow cytometric data. Attention is given both to the normal and to the polyploid case.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02458881
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  • 4
    Electronic Resource
    Electronic Resource
    Changes in intracellular pH and cell volume during the early phase of DMSO-induced differentiation of friend erythroleukemia cells (1987)
    Springer
    Cellular and molecular life sciences 43 (1987), S. 914-916 
    Details
    ISSN: 1420-9071
    Keywords: Friend cells ; differentiation ; intracellular pH ; cell volume
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Changes in intracellular pH and water volume were measured after treatment of Friend erythroleukemia cells with 1.5% DMSO. It was found that a continuous decrease in pHi occurred, beginning 1 h after induction and a decline in pHi of 0.18 was measured after 9 h. In addition a decline in cellular water volume, of 12% only 15 min after induction, and 23% after 9 h, was observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01951665
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  • 5
    Electronic Resource
    Electronic Resource
    The carbon balance of flowers of Diplacus aurantiacus (Scrophulariaceae) (1985)
    Springer
    Oecologia 66 (1985), S. 530-535 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Measurements and modeling of photosynthesis, respiration and growth in flowers of Diplacus aurantiacus, a semidrought-deciduous shrub, indicate that they can provide 18%–25% of their total carbon requirements through photosynthesis of flower parts. Daily photosynthetic carbon fixation exceeds daily respiratory CO2 loss during most non-fruiting stages of development. However, this carbon gain fails to meet the requirements for new biomass construction during bud growth and corolla expansion. During fruiting stages, insufficient carbon is fixed to fully supply either respiration or growth. The calyx performs most of the flower's photosynthesis throughout the life of the flower. However, during stages of fruit development, the contribution of the ovary to flower photosynthesis may equal that of the calyx.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00379345
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  • 6
    Electronic Resource
    Electronic Resource
    Responses of wild plants to nitrate availability (1989)
    Springer
    Oecologia 79 (1989), S. 542-550 
    Details
    ISSN: 1432-1939
    Keywords: Bromus ; Relative growth rate ; Nitrate uptake ; Limiting external concentration ; Grasses
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Two annual species of Bromus, an invader (B. hordeaceus, ex B. mollis) and a non-invader (B. intermedius), were grown for 28 days in growth chambers, at 5 and 100 μM NO 3 - in flowing nutrient solution. No differences between the two species were observed at either NO 3 - level, in terms of relative growth rate (RGR) or its components, dry matter partitioning, specific NO 3 - absorption rate, nitrogen concentration, and other characteristics of NO 3 - uptake and photosynthesis. The effects of decreasing NO 3 - concentration in the solution were mainly to decrease the NO 3 - concentration in the plants through decreased absorption rate, and to decrease the leaf area ratio through increased specific leaf mass and decreased leaf mass ratio. Organic nitrogen concentration varied little between the two treatments, which may be the reason why photosynthetic rates were not altered. Consequently, RGR was only slightly decreased in the 5-μM treatment compared to the 100-μM treatment. This is in contrast with other species, where growth is reduced at much higher NO 3 - concentrations. These discrepancies may be related to differences in RGR, since a log-linear relationship was found between RGR and the NO 3 - concentration at which growth is first reduced. In addition, a strong linear relationship was found between the RGR of these species and their maximum absorption rate for nitrate, suggesting that the growth of species with low maximum RGR may be partly regulated by nutrient uptake.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00378673
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  • 7
    Electronic Resource
    Electronic Resource
    Seed weight and seed resources in relation to plant growth rate (1988)
    Springer
    Oecologia 76 (1988), S. 158-159 
    Details
    ISSN: 1432-1939
    Keywords: Energy content ; Relative growth rate ; Seed weight
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Relative growth rate in radish is not influenced by initial seed weight.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00379615
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  • 8
    Electronic Resource
    Electronic Resource
    Compensating effects to growth of carbon partitioning changes in response to SO2-induced photosynthetic reduction in radish (1988)
    Springer
    Oecologia 75 (1988), S. 502-506 
    Details
    ISSN: 1432-1939
    Keywords: Carbon allocation ; Photosynthetic performance ; SO2 inhibition ; Growth analysis ; Radish
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Exposure of plants to SO2 reduced their photosynthetic performance due tio reductions in carboxylating capacity. Although the reduced carbon gain resulted in a lower growth rate of SO2-exposed plants over that of controls, their loss of potential growth was minimized because of proportional increases in allocation to new leaf material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00776411
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  • 9
    Electronic Resource
    Electronic Resource
    Responses of glomerular filtration, renal blood flow and salt-water handling to acute cardioselective and non-selective β-adrenoceptor blockade in essential hypertension (1989)
    Springer
    European journal of clinical pharmacology 36 (1989), S. 343-345 
    Details
    ISSN: 1432-1041
    Keywords: metoprolol ; pindolol ; renal haemodynamics ; salt-water handling ; hypertension ; beta-adrenoceptor blockade ; ISA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The effects on renal hemodynamics and salt-water handling of equipotent doses of the cardioselective β-blocker metoprolol (M, 100 mg) and of the non-selective (intrinsic sympathetic activity) β-antagonist pindolol (P, 10 mg) were compared in 30 WHO Grade 1–2 hypertensive men. M lowered pulse rate more than P. Systolic pressure was equally reduced by both agents, and diastolic and mean pressures were decreased only after P. Glomerular filtration rate was not significantly altered by either antagonist, and renal blood flow decreased by approximately 11% both after M and P. Renal vascular resistance was unchanged after P, and was increased by 10% after M. It is concluded that, like the effects on central haemodynamics, ISA is more important in the renal response to β-adrenoceptor blockade than is β-receptor selectivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00558292
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  • 10
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    Differential cross sections for coherent and incoherent neutral-pion photoproduction from calcium (1989)
    American Physical Society
    Details
    Publication Date: 1989-07-31
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society
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