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  • 1
    Electronic Resource
    Electronic Resource
    Cavity-locked ring-down spectroscopy (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 3991-3997 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have performed cavity ring-down spectroscopy by locking a high-finesse resonator to the probe laser. We have obtained combination overtone spectra of water vapor in the ambient environment with a baseline noise of 5×10−9 cm−1 for decay constants (R=99.93% reflectors) of 1 μs. This cavity-locked approach ensures single transverse mode excitation, reduces shot-to-shot fluctuations in the decay constant to 4×10−3, and eliminates oscillations in spectral backgrounds. This approach also allows ring-down decay acquisition rates limited only by the ring-down and buildup constants of the resonator, and holds the promise of offering truly shot-noise-limited cavity ring-down spectroscopy measurements. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.367155
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  • 2
    Electronic Resource
    Electronic Resource
    Dietary effects on (pro)insulin biosynthesis and insulin-degrading activity in islets from sand rats
    Amsterdam : Elsevier
    Molecular and Cellular Endocrinology 43 (1985), S. 95-103 
    Details
    ISSN: 0303-7207
    Keywords: [^3H]leucine incorporation ; insulin degradation ; islet of Langerhans ; islet ultrastructure ; sand rats ; thiol-protein disulfide oxidoreductase
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0303-7207(85)90046-2
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  • 3
    Electronic Resource
    Electronic Resource
    Microbiologically safe aseptic packing of food products
    Amsterdam : Elsevier
    Trends in Food Science and Technology 4 (1993), S. 21-25 
    Details
    ISSN: 0924-2244
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0924-2244(05)80007-X
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  • 4
    Electronic Resource
    Electronic Resource
    Microbiologically safe aseptic packing of food products
    Amsterdam : Elsevier
    Trends in Food Science and Technology 4 (1993), S. 21-25 
    Details
    ISSN: 0924-2244
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0924-2244(05)80007-X
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  • 5
    Electronic Resource
    Electronic Resource
    Isoelectric focusing-immunoassay: A new technique applied to the high molecular weight a-component from bovine insulin
    Amsterdam : Elsevier
    Analytical Biochemistry 53 (1973), S. 650-653 
    Details
    ISSN: 0003-2697
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0003-2697(73)90118-8
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  • 6
    Electronic Resource
    Electronic Resource
    Effects of sodium selenite on microbial activity of mull, moder and mor soils (1988)
    Springer
    Biology and fertility of soils 6 (1988), S. 148-152 
    Details
    ISSN: 1432-0789
    Keywords: Selenite ; Se-effects on soil ; Mull ; Moder ; Mor ; N-Mineralization ; Enzym activity ; CO2-production
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Effects of Na2SeO3 on microbial activity of mull, moder and mor soils were investigated with perfusion experiments under controlled laboratory conditions. Treatments with Se at 50 mg/kg reduced carbon dioxide production and dehydrogenase activity in the mor and moder soils. Se at 250 (Ah) to 1000 (L) mg/kg had to be added to the mull soil in order to affect both parameters. In contrast to the effect on respiration and dehydrogenase activity, N mineralization, especially ammonification, was stimulated by the addition of Se. This is probably due to secondary effects such as dissolution of organic matter and P desorption. The relative inhibition of arylsulfatase activity was closely correlated with a decrease in soil respiration. It was conduded that the reduction of arylsulfatase activity in Se-treated soils was the result of a reduction in enzyme synthesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00257665
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  • 7
    Electronic Resource
    Electronic Resource
    Combination effects of heavy metals and fluoranthene on soil bacteria (1997)
    Springer
    Biology and fertility of soils 25 (1997), S. 274-278 
    Details
    ISSN: 1432-0789
    Keywords: Key words Heavy metals ; Fluoranthene ; Combination effects ; Soil bacteria ; Ecotoxicity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The effects of (1) Cd, Cu, Zn, and fluoranthene (FLA), separately applied, and (2) combinations of one of these heavy metals with FLA on the growth of bacteria were studied in agar plate experiments. The bacteria were extracted from A horizons of a Eutric Regosol and a Calcic Chernozem. Significant reductions of bacterial counts were observed for both soils at concentrations 〉 1.0 mg Cd l–1, 0.5 mg Cu l–1, and 0.5 mg Zn l–1, respectively. Additions of FLA up to 100 mg l–1 did not result in increasing reductions of bacterial growth in the Regosol. Only 0.5, 2, and 100 mg FLA l–1 caused significant reductions of 22–27%. Bacterial counts were not affected by 0.2 mg FLA l–1. Low concentrations of heavy metals which were not affective when added separately were found to reduce bacterial growth when applied in combination with 0.2 mg FLA l–1. At higher levels of heavy metals up to 2.5 mg l–1, addition of FLA also increased the toxicity of the metals. It is assumed that the enhancement of toxicity by FLA is due to an alteration of the permeability of bacterial cell membranes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003740050314
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  • 8
    Electronic Resource
    Electronic Resource
    Long-term effects of different inorganic pollutants on nitrogen transformations in a sandy cambisol (1989)
    Springer
    Biology and fertility of soils 7 (1989), S. 254-258 
    Details
    ISSN: 1432-0789
    Keywords: N-mineralisation ; Nitrification ; Arginine ammonification ; Inorganic pollutants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Long-term effects of 12 inorganic pollutants on N transformations were studied in a sandy cambisol. As, Be, Br, Cd, Cr, F, Pb, Hg, Se, Sn, and V were added to the soil as inorganic salts in 1975 and 1976. Soil samples were taken in 1984 to determine total N mineralisation and nitrification. All pollutants except Se and Sn inhibited N mineralisation. The most toxic elements under investigation were Be and Hg. Nitrification was reduced to a lower degree than total N mineralisation. As, Be, Cd, Cr, F, Pb, Se, and Sn failed to inhibit this process at all. It is assumed that nitrifying bacteria became adapted to these pollutants in the course of time. The arginine-ammonification method was less sensitive in detecting the effects of pollutants on N transformation than the N mineralisation test.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00709657
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  • 9
    Electronic Resource
    Electronic Resource
    Fluoride-induced changes in chemical properties and microbial activity of mull, moder and mor soils (1987)
    Springer
    Biology and fertility of soils 5 (1987), S. 49-55 
    Details
    ISSN: 1432-0789
    Keywords: Fluoride ; F-effects on soils ; Mull ; Moder ; Mor ; Dehydrogenase activity (DHA) ; Alkaline phosphatase ; Arylsulphatase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Fluoride-induced changes of chemical properties and microbial activities in humus soils were investigated in 12-week lysimeter experiments. The mull soil showed the highest F-adsorption capacity, in which 94% of the fluoride added was retained after addition of 4.5 mg F/cm2 as NaF. The moder and mor soils only adsorbed 52% and 41%, respectively. F-additions induced leaching of organic matter, Fe, Al and P and increases in soil pH in the moder and mor. In contrast no Al, Fe and P was leached from the mull and only minor amounts of organic matter dissolved after a single application of 4.5 mg F/cm2. Treatments with NaF up to 3700 mg F/kg did not significantly reduce respiration in any of the humus forms. Dehydrogenase, alkaline phosphatase and arylsulfatase activities as well as nitrification were inhibited at much lower F-additions in the moder and mor soils. A significant decrease in ammonification was observed in the moder. In contrast, microbial processes in the mull soil were not inhibited. This is due to its high adsorption capacity and the relatively low toxicity of F-ions. According to computations using GEOCHEM, the F-ion was the most abundant species in mull lysimeter leachates. Leachates of moder and mor soils contained mainly AIF-complexes (90%–99%). The lack of any effects from NaF treatment on soil respiration is attributed to the observed positive effects, e.g. dissolution of organic matter, desorption of P and increases in soil pH.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00264346
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  • 10
    Electronic Resource
    Electronic Resource
    Effects of single and successive additions of cadmium, nickel and zinc on carbon dioxide evolution and dehydrogenase activity in a sandy luvisol (1991)
    Springer
    Biology and fertility of soils 11 (1991), S. 34-37 
    Details
    ISSN: 1432-0789
    Keywords: Cadmium ; Nickel ; Zinc ; Successive addition ; Soil respiration ; Dehydrogenase activity ; Carbon dioxide production
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The effects of single and successive additions of Cd, Ni, and Zn on CO2 evolution and dehydrogenase activity in a sandy luvisol were investigated in batch experiments under laboratory conditions. Successive additions of Cd, Ni, and Zn inhibited soil respiration relatively more than single doses, even before the same amount of metals had been added. In general, split additions of all metals reduced dehydrogenase activities in all soils to a lesser degree until the 28th day. Thereafter both modes of metal addition had the same effects throughout although the last successive addition was added on the 35th day. It is assumed that the relatively greater effect, especially on CO2 evolution, of successive additions during the first period was due to short-term increases metal concentrations in the soil solution after each application.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00335831
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