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  • 1
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    Response of Genotypes of Hyalella azteca to Zinc Toxicity (1999)
    Springer
    Details
    Publication Date: 1999-07-01
    Print ISSN: 0007-4861
    Electronic ISSN: 1432-0800
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Published by Springer
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    PAPER CURRENT
  • 2
    Electronic Resource
    Electronic Resource
    Effects of N addition rates on the productivity ofPicea sitchensis,Thuja plicata, andTsuga heterophylla seedlings (1996)
    Springer
    Trees 10 (1996), S. 189-197 
    Details
    ISSN: 1432-2285
    Keywords: Nitrogen ; Picea sitchensis ; Relative growth rates ; Thuja plicata ; Tsuga heterophylla
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Seedlings ofPicea sitchensis, Thuja plicata andTsuga heterophylla were supplied N hydroponically at one of four exponentially increasing rates of addition (0.09, 0.07, 0.05, or 0.025 gN-1 day-1) for up to 3 months in a naturally illuminated glasshouse. Relative growth rates (RGR) were analyzed as a function of N uptake, the allocation of assimilated N to foliage (LNFR), foliar N concentrations (Nla) and met assimilation rates (NAR), which were combined to estimate N productivity (RGR per unit whole-plant N concentration). Nitrogen accumulation, biomass and N partitioning and RGR and its components varied with species in response to the different N regimes.T. heterophylla had the lowest maximum wholeplant N concentrations (wpN) and specific absorption rates for N and exhibited the least plasticity in root: shoot ratios as wpN increased from 11–21 mg g-1. In all species, RGR increased linearly with wpN, while LNFR increased curvilinearly. Foliar N (Nla) increased linearly with wpN and NAR increased linearly with Nla. The RGRs ofT. heterophylla were highest at wpNs up to 18 mg g-1, a result of higher foliar N use efficiencies (NAR/Nla). However, RGR increased more with wpN inT. plicata andP. sitchensis. Although LNFR increased with wpN in all species, foliar N use efficiency declined, possibly due to an increased partitioning of foliar soluble N to non-photosynthetic compounds. Thus, in each species, N productivity did not increase above intermediate levels of wpN: 14 mg g-1 inT. heterophylla, 16 mg g-1 inP. sitchensis and 17 mg g-1 inT. plicata.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02340771
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  • 3
    Electronic Resource
    Electronic Resource
    Effects of N addition rates on the productivity ofPicea Sitchensis,Thuja plicata, andTsuga heterophylla seedlings (1996)
    Springer
    Trees 10 (1996), S. 198-205 
    Details
    ISSN: 1432-2285
    Keywords: Nitrogen ; Photosynthesis ; Picea sitchensis ; Thuja plicata ; Tsuga heterophylla
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The effects of differing, exponentially increasing rates of N addition (0.025, 0.05, 0.07 and 0.09 gN gN-1day-1) on photosynthesis, discrimination against13C and partitioning of foliar N to chlorophyll and major photosynthetic proteins were compared in seedlings of the evergreen conifersPicea sitchensis, Thuja plicata andTsuga heterophylla. T. heterophylla had the lowest range of foliar N concentrations (Nlm). Across species, photosynthetic rates (A) increased linearly with Nlm to a maximum at 21 mg g-1 and declined at higher Nlms. Species differences inA resulted from differences in Nlm, not from differences in photosynthetic N use efficiency. Self-shading may have causedA to decline at a high Nlm inP. sitchensis andT. plicata. Measurements of gas exchange and δ13C suggested that carboxylation capacity increased more than did stomatal conductance as Nlm increased. The responses were small and confined to Nlms associated with the lesser rates of N addition. Concentrations of total protein, ribulose 1,5-bisphosphate carboxylase (RUBISCO) and the light harvesting chlorophyll a/b protein complex (LHC) increased with Nlm, but the fraction of foliar N allocated to RUBISCO and LHC increased with Nlm only inP. sitchensis and only between the 0.025 and 0.05N regimes. The responsiveness ofA and concentrations of RUBISCO to Nlm were less than reported for deciduous C3 species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02340772
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  • 4
    Electronic Resource
    Electronic Resource
    Existence and nonexistence of steady-state solutions for a selection-migration model in population genetics (1989)
    Springer
    Journal of mathematical biology 27 (1989), S. 91-104 
    Details
    ISSN: 1432-1416
    Keywords: Population genetics ; Bifurcation theory ; Indefinite weight functions ; Sub- and supersolutions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract We discuss a selection-migration model in population genetics, involving two alleles A 1 and A 2 such that A 1 is at an advantage over A 2 in certain subregions and at a disadvantage in others. It is shown that if A 1 is at an overall disadvantage to A 2 and the rate of gene flow is sufficiently large than A 1 must die out; on the other hand, if the two alleles are in some sense equally advantaged overall, then A 1 and A 2 can coexist no matter how great the rate of gene flow.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00276083
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  • 5
    Electronic Resource
    Electronic Resource
    Improper actions and higher connectivity at infinity (2000)
    Springer
    Commentarii mathematici Helvetici 75 (2000), S. 171-188 
    Details
    ISSN: 1420-8946
    Keywords: Key words. Connectivity at infinity, Artin groups, duality groups.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract. Given an improper action (= cell stabilizers are infinite) of a group G on a CW-complex $ {\cal X} $ , we present criteria, based on connectivity at infinity properties of the cell stabilizers under the action of G that imply connectivity at infinity properties for G. A refinement of this idea yields information on the topology at infinity of Artin groups, and it gives significant progress on the question of which Artin groups are duality groups.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000140050118
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  • 6
    Electronic Resource
    Electronic Resource
    Mutagenic potential of plants grown on municipal sewage sludge-amended soil (1991)
    Springer
    Archives of environmental contamination and toxicology 20 (1991), S. 385-390 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract TheSalmonella/microsome assay was used to monitor the mutagenic potential of the organic extract of plants grown on municipal sewage sludge amended soils. The solvent-extractabie organic chemicals from sewage sludge, unamended Padina fine sand (Grossarenic Paleustalf), sludge amended Padina fine sand, and two forage crops; alfalfa (Medicago sativa) and coastal bermudagrass (Cynodon dactylon) were tested withSalmonella strain TA98 with and without metabolic activation. The mutagenic potential of the sludge-amended soil was greater than that of the unamended soil. Fractions extracted from the sludge amended soil over a 154 day period displayed an increase in mutagenicity. None of the plant extracts, whether collected from plants grown on sludge amended or unamended soils, induced a positive response (doubling of revertants at two consecutive dose levels) in the bioassay. Thus, for the evaluated conditions, plants are not likely to translocate significant quantities of organic mutagens from municipal sludge amended soil.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01064408
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  • 7
    Electronic Resource
    Electronic Resource
    The effects of dietary calcium and chlordecone on cholinesterase, triglycerides, low density lipoproteins, and cholesterol in serum of rat (1993)
    Springer
    Archives of environmental contamination and toxicology 24 (1993), S. 365-367 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract Male, Sprague-Dawley rats were treated with 0, 1, 10, 50, 100 ppm chlordecone (Cd) mixed in calcium-sufficient (Ca-S) or calcium-deficient (Ca-D) diet for 15 days. A significant decrease in body weight gain was observed in 100 ppm of Cd-treated rats. Cholinesterase (ChE) activity was significantly decreased in serum of Ca-D rats. Chlordecone did not alter serum ChE activity in both Ca-S and Ca-D rats. However, Cd decreases serum triglycerides, low density lipoproteins (LDL) and cholesterol in both Ca-S and Ca-D rats. Rats fed with Ca-S or Ca-D diet exhibited differential sensitivity to Cd-toxicity. Decreased levels of serum triglycerides, LDL and cholesterol suggest that Cd might interfere in lipid metabolism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01128735
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  • 8
    Electronic Resource
    Electronic Resource
    Effects of increasing Mg++ ion concentration on the PKU monitoring assay (1979)
    Springer
    Cellular and molecular life sciences 35 (1979), S. 462-463 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Inaccuracies in a commonly used bacterial inhibition assay for blood phenylalanine levels arise when the Mg++ ion concentration in the assay medium is increased. This has practical implications in the diagnosis and management of phenylketonuria.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01922707
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  • 9
    Electronic Resource
    Electronic Resource
    DNA in wheat seeds from European archaeological sites (1994)
    Springer
    Cellular and molecular life sciences 50 (1994), S. 571-575 
    Details
    ISSN: 1420-9071
    Keywords: Ancient DNA ; archaeobotany ; carbonized grain ; DNA sequences ; glutenin alleles ; seed proteins ; Triticum ; wheat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract We have used hybridization analysis to detect ancient DNA in wheat seeds collected from three archaeological sites in Europe and the Middle East. One of these samples, carbonizedT. spelta dated to the first millennium BC, has yielded PCR products after amplification with primers directed at the leader regions of the HMW (high molecular weight) glutenin alleles. Sequences obtained from these products suggest that the DNA present in the Danebury seeds is chemically damaged, as expected for ancient DNA, and also indicate that it should be possible to study the genetic variability of archaeological wheat by ancient DNA analysis. Finally, we describe a PCR-based system that enables tetraploid and hexaploid wheats to be distinguished.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01921727
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  • 10
    Electronic Resource
    Electronic Resource
    Effects of N addition rates on the productivity of Picea sitchensis, Thuja plicata, and Tsuga heterophylla seedlings (1996)
    Springer
    Trees 10 (1996), S. 189-197 
    Details
    ISSN: 0931-1890
    Keywords: Key words Nitrogen ; Picea sitchensis ; Relative growth rates ; Thuja plicata ; Tsuga heterophylla
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract  Seedlings of Picea sitchensis, Thuja plicata and Tsuga heterophylla were supplied N hydroponically at one of four exponentially increasing rates of addition (0.09, 0.07, 0.05, or 0.025 gN–1 day–1) for up to 3 months in a naturally illuminated glasshouse. Relative growth rates (RGR) were analyzed as a function of N uptake, the allocation of assimilated N to foliage (LNFR), foliar N concentrations (Nla) and met assimilation rates (NAR), which were combined to estimate N productivity (RGR per unit whole-plant N concentration). Nitrogen accumulation, biomass and N partitioning and RGR and its components varied with species in response to the different N regimes. T. heterophylla had the lowest maximum whole-plant N concentrations (wpN) and specific absorption rates for N and exhibited the least plasticity in root : shoot ratios as wpN increased from 11 – 21 mg g–1. In all species, RGR increased linearly with wpN, while LNFR increased curvilinearly. Foliar N (Nla) increased linearly with wpN and NAR increased linearly with Nla. The RGRs of T. heterophylla were highest at wpNs up to 18 mg g–1, a result of higher foliar N use efficiencies (NAR/Nla). However, RGR increased more with wpN in T. plicata and P. sitchensis. Although LNFR increased with wpN in all species, foliar N use efficiency declined, possibly due to an increased partitioning of foliar soluble N to non-photosynthetic compounds. Thus, in each species, N productivity did not increase above intermediate levels of wpN: 14 mg g–1 in T. heterophylla, 16 mg g–1 in P. sitchensis and 17 mg g–1 in T. plicata.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00009647
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