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  • 1
    Electronic Resource
    Electronic Resource
    Solvent effects in organic chemistry. XIV. Complexing of sodium ion by various common solvents as ligands in acetone solutions (1972)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 94 (1972), S. 4776-4777 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00768a081
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  • 2
    Electronic Resource
    Electronic Resource
    Nitrogen transformations in tropical soils under conventional and sustainable farming systems (1996)
    Springer
    Biology and fertility of soils 21 (1996), S. 252-256 
    Details
    ISSN: 1432-0789
    Keywords: Nitrification ; Tropical soil ; Sustainable farming ; Nitrifier population ; Management practices ; Crop rotation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Samples of alluvial soil from mixed sandstone shale and slate and of Taiwan clay were collected from two sites, both managed under a similar crop rotation scheme. The fields were further divided into sections which were managed under either conventional farming or sustainable farming practices. When the soil samples were collected in April 1989, after 1 year of operation under conventional or sustainable practices, the nitrification activities of both soils managed under sustainable practices practices. The nitrifying activities in Taiwan clay samples collected in April 1993 which had been managed with chemical or with organic fertilizer were not significantly different. However, nitrifying activity in the alluvial soil was higher under sustainable than under conventional practices. Numbers of NH 4 + -oxidizing bacteria were not significantly different in any of the soil samples irrespective of the different management practices. In contrast, higher numbers of NO 2 - -oxidizing bacteria were detected in both soils managed sustainably. The results also indicated that the composition of NH 4 + -oxidizing bacteria differed in the alluvial soil when managed with different kinds of fertilizer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00334900
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  • 3
    Electronic Resource
    Electronic Resource
    Nitrogen transformations in tropical soils under conventional and sustainable farming systems (1996)
    Springer
    Biology and fertility of soils 21 (1996), S. 252-256 
    Details
    ISSN: 1432-0789
    Keywords: Key words Nitrification ; Tropical soil ; Sustainable farming ; Nitrifier population ; Management practices ; Crop rotation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Samples of alluvial soil from mixed sandstone shale and slate and of Taiwan clay were collected from two sites, both managed under a similar crop rotation scheme. The fields were further divided into sections which were managed under either conventional farming or sustainable farming practices. When the soil samples were collected in April 1989, after 1 year of operation under conventional or sustainable practices, the nitrification activities of both soils managed under sustainable practices had improved dramatically compared to the conventional practices. The nitrifying activities in Taiwan clay samples collected in April 1993 which had been managed with chemical or with organic fertilizer were not significantly different. However, nitrifying activity in the alluvial soil was higher under sustainable than under conventional practices. Numbers of NH-oxidizing bacteria were not significantly different in any of the soil samples irrespective of the different management practices. In contrast, higher numbers of NO-oxidizing bacteria were detected in both soils managed sustainably. The results also indicated that the composition of NH-oxidizing bacteria differed in the alluvial soil when managed with different kinds of fertilizer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00334900
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  • 4
    Electronic Resource
    Electronic Resource
    Nitrification and nitrifying potential of tropical and subtropical soils (1993)
    Springer
    Biology and fertility of soils 15 (1993), S. 87-90 
    Details
    ISSN: 1432-0789
    Keywords: Nitrification ; Tropical soil ; Subtropical soil ; Nitrifying population
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Nitrification was measured in five different soils (slate alluvial soil, sandstone shale alluvial soil, sandstone shale and slate alluvial soil, red soil, and Taiwan clay). In these soils different lag periods were recorded before the onset of nitrification. Nitrifying activity was highest in sandstone shale alluvial soil and the lowest in acidic red soil. A part from those in the red soil, the numbers of nitrifying bacteria detected were all higher than numbers reported in temperate soils. However, there were no clear relationships between the numbers of nitrifying bacteria and the rate of nitrification in these soils. When soil cores were incubated for 3 weeks, no NO inf2 sup- or NO inf3 sup- was defected in the slate alluvial soil. This was ascribed to denitrification.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00336423
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  • 5
    Electronic Resource
    Electronic Resource
    Effects of Rhizobium and vesicular-arbuscular mycorrhiza inoculations on nodulation, symbiotic nitrogen fixation and soybean yield in subtropical-tropical fields (1988)
    Springer
    Biology and fertility of soils 6 (1988), S. 165-169 
    Details
    ISSN: 1432-0789
    Keywords: Rhizobium ; Glomus ; VA mycorrhiza ; Soybean inoculation ; Glycine max ; Symbiotic N2 fixation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Field experiments were carried out to determine the effects of single and mixed inoculations with Rhizobium and vesicular-arbuscular mycorrhiza (VAM) on nodulation, symbiotic N2 fixation and yield of soybeans in six Taiwan subtropical-tropical sites. Inoculation with Rhizobium alone significantly increased nodulation, nodule weight and nitrogenase activity of nodules in three out of six experimental fields, and affected soybean yields in the range −13% to + 134%. Inoculation with VAM fungi alone did not have a significant effect on nodulation and nitrogenase activity. Mycorrhiza inoculation affected soybean yields in the range −13% to + 65%, but only the yield increases at one out of six sites with N application were statistically significant. Mixed inoculation with Rhizobium and mycorrhiza affected yields in the range −8% to + 145% A synergistic effect from mixed inoculation of Rhizobium-mycorrhiza on soybean yields was found in one out of six experimental fields. The yield response to N application (40 kg N ha−1) in these six paddy-field trials was not significant. These results suggest that single or mixed inoculation of rhizobia can greatly assist soybean grain yields and can replace N fertilizers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00257668
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  • 6
    Electronic Resource
    Electronic Resource
    Capital markets, urban unemployment and land
    Amsterdam : Elsevier
    Journal of Development Economics 38 (1992), S. 407-413 
    Details
    ISSN: 0304-3878
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Political Science , Economics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0304-3878(92)90008-W
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  • 7
    Electronic Resource
    Electronic Resource
    Foreign capital inflows and welfare in an economy with imperfect competition
    Amsterdam : Elsevier
    Journal of Development Economics 45 (1994), S. 141-154 
    Details
    ISSN: 0304-3878
    Keywords: Imperfect competition ; International capital mobility ; Welfare ; [JEL classification codes] F21 ; [JEL classification codes] O18
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Political Science , Economics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0304-3878(94)90064-7
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  • 8
    Electronic Resource
    Electronic Resource
    Imported materials prices, urban unemployment, and welfare
    Amsterdam : Elsevier
    International Review of Economics and Finance 1 (1992), S. 121-132 
    Details
    ISSN: 1059-0560
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Economics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/1059-0560(92)90029-C
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  • 9
    Electronic Resource
    Electronic Resource
    Unemployment, wage indexation and commercial policies
    Amsterdam : Elsevier
    Journal of Macroeconomics 15 (1993), S. 165-174 
    Details
    ISSN: 0164-0704
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Economics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0164-0704(93)90059-U
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  • 10
    Electronic Resource
    Electronic Resource
    Enrichment enhances the expression of sgk, a glucocorticoid-induced gene, and facilitates spatial learning through glutamate AMPA receptor mediation (2003)
    Oxford, UK : Blackwell Science Ltd
    European journal of neuroscience 18 (2003), S. 0 
    Details
    ISSN: 1460-9568
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: We have previously demonstrated that the serum and glucocorticoid-inducible kinase (sgk) gene plays a causal role in facilitating memory performance in rats. Environment enrichment is known to facilitate spatial learning. We therefore examined the effect of enrichment on sgk expression. We also examined the role of sgk in spatial and nonspatial learning and the regulation of sgk expression by activation of different glutamate receptors. Both real-time polymerase chain reaction and Western blot analyses revealed that enrichment training preferentially increased sgk mRNA and protein levels in the hippocampus. Transfection of sgk mutant DNA to the hippocampal CA1 area markedly impaired spatial learning, fear-conditioning learning and novel object-recognition learning in rats, but enrichment training effectively reversed these learning deficits. Meanwhile, S422A mutant DNA transfection prevented enrichment-induced spatial learning facilitation. In studying glutamate receptor regulation of sgk expression, we found that blockade of N-methyl-d-aspartate (NMDA) receptors in general, and the NR2B subunit in particular both effectively blocked enrichment-induced spatial learning facilitation, but they did not block enrichment-induced sgk expression. Upon various glutamate agonist infusions, only α-amino-3-hydroxy-5-methylisoxazole-4-propionic acid (AMPA) increased sgk mRNA levels significantly in the hippocampus. Furthermore, blockade of AMPA receptors effectively blocked both enrichment-induced spatial learning facilitation and sgk expression. These results indicate that there is a dissociation between NMDA receptor activation and sgk expression. Enrichment enhanced spatial learning through both NMDA and AMPA receptor activation, whereas enrichment-induced sgk expression is specifically mediated through AMPA receptors. These results suggest that sgk could serve as a novel molecular mechanism, in addition to the NMDA receptor NR2B, underlying enrichment-induced learning facilitation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1460-9568.2003.03032.x
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