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  • 1
    Electronic Resource
    Electronic Resource
    Determinants of leaf litter patchiness in mixed species New Jersey pine barrens forest and its possible influence on soil and soil biota (2000)
    Springer
    Biology and fertility of soils 31 (2000), S. 288-293 
    Details
    ISSN: 1432-0789
    Keywords: Key words Pine barrens ; Litter ; Mycorrhizae ; Ericaceous shrub layer ; Community structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract  We have identified the importance of ground layer ericaceous shrub density as a determinant of leaf litter patch size in upland oak/pine communities of the New Jersey pine barrens. Litter patch area is directly proportional to the number of ericaceous stems. This observation has been confirmed by experimentation where leaf litter patches accumulated under artificial stems for a period of 2 years. Leaf litter patches of different sizes contain differing proportions of leaf species. Large patches contain a significantly higher proportion of oak leaves than small patches. Difference in physical structure of large and small patches, due to leaf species composition and due to differential leaf chemistries, result in differences in soil characteristics and soil biota under the patches. Soil moisture and organic matter content of upper soil layers are greater under large litter patches than under small ones. We have preliminary evidence that these changes influence the community structure of ectomycorrhizae developing under patches of different sizes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003740050658
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  • 2
    Electronic Resource
    Electronic Resource
    Dissolved reactive phosphorus in a Calcaric Fluvisol as affected by the addition of agricultural wastes (2004)
    Oxford, UK : Blackwell Publishing Ltd
    Soil use and management 20 (2004), S. 0 
    Details
    ISSN: 1475-2743
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract. Land application of organic wastes can result in the accumulation of available soil phosphorus (P) and in an increase risk of eutrophication of surface and shallow groundwaters. We conducted laboratory experiments to examine the effect of waste application on the concentration of dissolved reactive phosphorus (DRP) in 1:5 soil to 0.005 m CaCl2 suspensions. Ten organic wastes, of which eight were mature composts, were applied to a P-rich Calcaric Fluvisol at rates ranging from 0 to 10% of soil by weight, and the difference in DRP concentration between suspensions containing waste and the untreated control (ΔDRP) was measured over a period of 300 days. In half of the suspensions of each waste–soil combination, 80 mg P (as KH2PO4) kg−1 soil was applied at day 14. Values of ΔDRP were generally positive, but a significant number of negative values were also recorded for some wastes and application rates, particularly at later sampling times if inorganic P had been added. Regression analyses revealed that ΔDRP (i) increased with increasing soluble reactive P at all times and (ii) increased in the short term, but decreased in the long term with increasing water soluble organic carbon in the waste. The fact that ΔDRP was sometimes negative for some waste types suggests that application of organic waste to soil does not necessarily increase eutrophication risks caused by soil P losses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1475-2743.2004.tb00339.x
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  • 3
    Electronic Resource
    Electronic Resource
    Propanil activity, uptake and metabolism in resistant Echinochloa spp. biotypes (2001)
    Oxford UK : Blackwell Science Ltd
    Weed research 41 (2001), S. 0 
    Details
    ISSN: 1365-3180
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Field resistance of Echinochloa spp. to propanil has been previously reported in Costa Rica, Colombia and Arkansas (USA). In this study, the mechanism of resistance was investigated in three resistant (R) and three susceptible (S) biotypes. The shoot fresh weight reduction in pot-grown plants from a post-emergence spray of propanil at 2.44 kg a.i. ha−1 on biotypes R/S from Costa Rica, Colombia and Arkansas was 35/98%, 25/79% and 20/82% respectively. In vitro chlorophyll fluorescence data from leaf tissue incubated in propanil showed that photosynthesis was inhibited in all biotypes, indicating that the propanil-binding site and enzyme were not altered. After transfer to herbicide-free solution, photosynthesis recovered only in resistant biotypes, indicating that the mechanism of resistance was caused by enhanced metabolism of the herbicide. Simultaneous treatment with fenitrothion, an aryl acylamidase inhibitor, prevented the recovery of photosynthesis in leaf tissue in two resistant biotypes. In contrast, the cytochrome P450 mono-oxygenase inhibitor, 1-aminobenzotriazole, did not prevent recovery from propanil in leaf tissue. Application of 14C-propanil to the second leaf of intact Echinochloa plants showed that c. 90% of the radioactivity remained in the treated leaf for up to 72 h after application. No major differences in translocation between R and S biotype plants were found. TLC analysis of tissue extracts from the treated leaves showed substantially less radioactivity associated with propanil, present after 72 h in rice or in the three R biotypes, compared with S biotypes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3180.2001.00231.x
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  • 4
    Electronic Resource
    Electronic Resource
    Evolution of recombination in a solid HDDR processed Nd14Fe79B7 alloy : The 6th joint magnetism and magnetic materials (MMM)−intermag conference (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 6825-6827 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A high-resolution scanning electron microscope was used to study the microstructural changes occurring during the desorption and recombination stages in a cast Nd14Fe79B7 alloy HDDR processed at 780 °C. Phase identification was based on backscattered electron contrast. In the early stages of desorption, the disproportionated structure in the matrix coarsens to produce a mixture of Nd-rich (NdH2 and/or Nd) and Fe-rich (αFe and/or Fe2B) clusters. At the center of the specimen, regions of recombined multicrystalline Nd2Fe14B phase are observed associated with Nd- and Fe-rich clusters. When desorption of hydrogen is almost complete, the microstructure consists of a Nd2Fe14B matrix with a few remaining Nd- and Fe-rich clusters. The subsequent completion of recombination results in a multigrained Nd2Fe14B structure, some grains being separated by Nd-rich material. The magnetic properties of the Nd14Fe79B7 alloy have been measured at significant stages during the desorption/recombination process at 600 °C, the stages being deduced from electrical resistivity measurements. Initially, the material is noncoercive with a high magnetization at 1100 kA/m, reflecting the high proportion of αFe in the sample. As recombination proceeds, the magnetization drops and the coercivity increases as the fine-grained Nd2Fe14B develops and the αFe disappears.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358143
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  • 5
    Electronic Resource
    Electronic Resource
    A simple Stark modulator (1991)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 62 (1991), S. 963-965 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A simple, all solid-state, circuit is described that produces a square wave with variable amplitude from 0 to 1000 V and a frequency of 120 kHz into a capacitive load. The device is of application to Stark modulation in microwave and gas radical e.s.r. spectroscopy. It has certain advantages over previous systems, being more compact, excluding supply short circuits, providing an output that is automatically real zero based and being continuously variable over the range 0–1000 V, thus avoiding the need for capacitive division.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141985
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  • 6
    Electronic Resource
    Electronic Resource
    The use of chiral iron complexes in mechanistic studies: The decarbonylation of carbonyl(pentahapto-cyclopentadienyl)triphenylphosphineiron acyls
    Amsterdam : Elsevier
    Journal of Organometallic Chemistry 74 (1974), S. C17-C20 
    Details
    ISSN: 0022-328X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0022-328X(00)83778-X
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  • 7
    Electronic Resource
    Electronic Resource
    The first seco-asbestinin: A novel class of diterpene from the Caribbean gorgonian Briareum asbestinum (Pallas)
    Amsterdam : Elsevier
    Tetrahedron Letters 35 (1994), S. 5793-5796 
    Details
    ISSN: 0040-4039
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0040-4039(00)78186-X
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  • 8
    Electronic Resource
    Electronic Resource
    Mechanical Behavior of Al-Mg-Si Alloys Reinforced with Ceramic and Intermetallic Particles (2003)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 416-418 (Feb. 2003), p. 219-227 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/06/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.416-418.219.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Dinosaur nests at the sea shore (1995)
    [s.l.] : Nature Publishing Group
    Nature 376 (1995), S. 731-732 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR - Beach deposits of the Arenisca de Aren Formation1 (southern Pyrenees, Maastrichtian, Upper Cretaceous) are rich in dinosaur eggs and bones, distributed over an area of about 15 km2 along the northern flank of the Tremp syncline (Fig. 1). At one locality (Bastus, Lleida) ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/376731a0
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  • 10
    Electronic Resource
    Electronic Resource
    Marine antitumor agents: 14-deoxycrassin and pseudoplexaurol, new cembranoid diterpenes from the Caribbean gorgonianPseudoplexaura porosa (1993)
    Springer
    Cellular and molecular life sciences 49 (1993), S. 179-181 
    Details
    ISSN: 1420-9071
    Keywords: Gorgonian ; antitumor agent ; cembranoid diterpene ; Pseudoplexaura porosa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Two new cytotoxic antitumor diterpenoids of the cembrane class, named 14-deoxycrassin (3) and pseudoplexaurol (4), have been isolated from the Caribbean gorgonian octocoralPseudoplexaura porosa. The structure of lactone3, possessing the infrequently encountered α-methylene-δ-lactone ring, has been established from spectral and chemical data and that of alcohol4 has been established from spectral data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01989427
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