ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 2000-2004  (30)
  • 1985-1989  (17)
  • 1
    Electronic Resource
    Electronic Resource
    The influence of arbuscular mycorrhizal colonization and environment on root development in soil (2003)
    Oxford, UK : Blackwell Science Ltd
    European journal of soil science 54 (2003), S. 0 
    Details
    ISSN: 1365-2389
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The production of fine roots is one of the principal means by which carbon, fixed during photosynthesis, enters the soil, and quantifying the production for particular combinations of environmental and biotic factors is important for predicting the sequestration of carbon in the soils of grassland ecosystems. Arbuscular mycorrhizal fungi (AMF) can have a major effect on the production of roots, and we studied how colonization by AMF affects the lifespan of roots. Twenty per cent of control roots of Trifolium repens survived for longer than 42 days whereas 37% survived that long in AMF-colonized plants. The overall survival of the roots of Lolium perenne was less than in T. repens: around 10% of roots survived beyond 42 days and this was not affected by AMF colonization. Previous studies have shown that lifespans of roots can be affected by temperature. We tested the hypothesis that these observations are linked to a change in the morphology of the root system caused by temperature and also by AMF. We found that inoculation with AMF in a microcosm study using Plantago lanceolata grown at various temperatures, with and without AMF, showed no clear effect of AMF on branching patterns. Temperature had a significant effect on total lengths, numbers and branching rates of some higher orders of roots. Total lengths of both secondary and tertiary roots grown at 27°C were about double those of plants grown at 15°C. Colonization by AMF tended to reduce this effect. Evidently the effect of colonization by AMF on root lifespan depends on the species. Increased branching, and thus a greater proportion of ephemeral roots, was responsible for shortening the lives of the roots at increased temperature, which suggests a strong link between lifespan and morphology.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1351-0754.2003.0565.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    High-spatial-resolution semiconductor characterization using a microwave eddy current probe (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 78 (2001), S. 129-131 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report on the design and application of a high-resolution microwave eddy current probe that consists of a microfabricated coil with inner and outer widths of 6 and 20 μm, respectively, integrated with a coplanar waveguide. In addition to improved spatial resolution, we implement a stub-matching technique, which enables us to make high-sensitivity measurements. We demonstrate the utility of our device by measuring the minority-carrier lifetime in a thin In0.53Ga0.47As film. Although our present demonstration does not allow us to reuse the sample, with minor changes this technique can be made noncontact and nondestructive. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1337639
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Infrared multiphoton dissociation of some oxygen-containing hydrocarbon ions. Differentiation of isomeric ion structures in the gas phase (1985)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 107 (1985), S. 8036-8042 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00312a040
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    The Topsat satellite (2001)
    Bingley : Emerald
    Aircraft engineering and aerospace technology 73 (2001), S. 380-382 
    Details
    ISSN: 0002-2667
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This paper discusses the Topsat satellite, currently being built by a partnership between DERA Space, Rutherford Appleton Laboratory, Surrey Satellite Technology Ltd and InfoTerra Ltd (Formerly NRSC). Topsat will have the capability to provide imagery at 25m panchromatic and 5m colour resolution, direct to the user at a mobile ground station, from a 125kg microsatellite in low Earth orbit. Its low-cost philosophy includes wide use of commercial off-the-shelf components and the goal of a one-year mission life.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/EUM0000000005626
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    facet.materialart.
    Unknown
    Reinvigorating the Debt Strategy (1989)
    Washington, D.C. : Periodicals Archive Online (PAO)
    Finance and Development. 26:3 (1989:Sept.) 8 
    Details
    ISSN: 0015-1947
    Topics: Economics
    Notes: The Debt Strategy
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:e355-1989-026-03-000003
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    The Experience of Rural Poverty in Malay Novels (1989)
    Cambridge : Cambridge University Press
    Modern Asian studies 23 (1989), S. 25-47 
    Details
    ISSN: 0026-749X
    Source: Cambridge Journals Digital Archives
    Topics: Ethnic Sciences , History , Political Science , Economics
    Notes: In significant contrast with Indonesian writing there is in Malay literature a body of work concerned with rural life. That this is the case suggests the degree to which Malay writers even today have their roots in the agricultural cycle of peasant experience. Those who now work in clerical jobs, in publishing, in journalism, in teaching, those in fact who make up the writers of the novels, however divorced and remote their present life-styles and occupations are from their origins, still look back to the village as the world of their formative experience. It is a world with which they are intimate and familiar, a source of spiritual reassurance, of values which they may not endorse, but which they understand fully, in opposition to the alien environment of the modern city where the totality of life is fragmented into exclusive and contradictory domains of experience. And it is precisely because the writers are not so removed from rural life in space and time, that when they do cast a glance backwards they are never tempted to review that life through the distorting lens of nostalgia. On the contrary, there is the realistic acknowledgement that their own moving away from the village has also been an escape. There is, therefore, ambivalence: the village is perceived as the repository of Malay culture, the locus of traditional values, yet at the same time it is a locus of ignorance, frustration and poverty, somewhere to return for spiritual regeneration, but never again for permanent residence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1017/S0026749X00011409
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Comparison of white clover and ammonium nitrate as nitrogen sources for tall fescue (1989)
    Springer
    Nutrient cycling in agroecosystems 21 (1989), S. 109-111 
    Details
    ISSN: 1573-0867
    Keywords: Legumes ; nitrogen fixation ; tall fescue ; white clover ; nitrogen fertilizer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract White clover was compared against five rates of nitrogen fertilizer (NH4NO3) as sources of N for tall fescue over a 3 year period. The white clover-tall fescue combination produced as much forage as tall fescue alone fertilized with 132–198 kg N ha−1 in the first 2 years. However, in the third year the white clover-tall fescue combination only produced as much forage as tall fescue alone fertilized with 0–66 kg N ha−1 as a result of a large decline in the stand of white clover. Tall fescue alone showed a significant response to fertilization up to the maximum rate of 264 kg N ha−1. Tall fescue fertilized with 264 kg N ha−1 produced significantly more forage than the white clover-tall fescue combination in all 3 years.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01080535
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    The fate of nitrogen from incorporated cover crop and green manure residues (2000)
    Springer
    Nutrient cycling in agroecosystems 56 (2000), S. 153-163 
    Details
    ISSN: 1573-0867
    Keywords: available N ; cover crop ; crop uptake ; green manure ; incorporation ; N2O
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Nitrogen retention and release following the incorporation of cover crops and green manures were examined in field trials in NE Scotland. These treatments reduced the amounts of nitrate-N by between 10–20 kg ha-1 thereby lowering the potential for leaching and gaseous N losses. However, uptake of N by overwintering crops was low, reflecting the short day-lengths and low soil temperatures associated with this part of Britain. Vegetation that had regenerated naturally was as effective as sown cover crops at taking up N over winter and in returning N to the soil for the following crop. Incorporation of residues generally resulted in lower mineralisation rates and reduced N2O emissions than the cultivation of bare ground, indicating a temporary immobilisation of soil N following incorporation. Emissions from incorporated cover crops ranged from 23–44 g N2O-N ha-1 over 19 days, compared with 61 g N2O-N ha-1 emitted from bare ground. Emissions from incorporated green manures ranged from 409–580 g N2O-N ha-1 over 53 days with 462 g N2O-N ha-1 emitted from bare ground. Significant positive correlations between N2O and soil NO3 - after incorporation (r=0.8–0.9; P〈0.001 and r=0.1–0.4; P〈0.05 for cover crops and green manures, respectively) suggest that this N2O was mainly produced during nitrification. There was no significant effect of either cover cropping or green manuring on the N content or yield of the subsequent oats crop, suggesting that N was not sufficiently limiting in this soil for any benefits to become apparent immediately. However, benefits of increased sustainability as a result of increased organic matter concentrations may be seen in long-term organic rotations, and such systems warrant investigation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009825606341
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Antisense RNA inhibition of polygalacturonase gene expression in transgenic tomatoes (1988)
    [s.l.] : Nature Publishing Group
    Nature 334 (1988), S. 724-726 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Polygalacturonase (PG) plays an important role in fruit softening by partially solubilizing the pectin fraction of the cell walls9'11. It is synthesized de novo12 as a result of the accumulation of PG mRNA13"15 when fruit ripen. We have previously isolated and characterized a complementary DNA ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/334724a0
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Intraspecific interference among larvae in a semivoltine dragonfly population (1987)
    Springer
    Oecologia 71 (1987), S. 447-456 
    Details
    ISSN: 1432-1939
    Keywords: Benthos ; Cannibalism ; Competition ; Field experiment ; Odonata ; Predation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary This study focuses on ways that the size distribution of individuals influences the types and intensities of competitive interactions within a population of aquatic arthropod predators. Three field experiments and one laboratory experiment were designed to test for feeding interference, interference mortality, and dispersal effects within and between larval size classes of the primarily semivoltine dragonfly Tetragoneuria cynosura in Bays Mountain Lake. One field experiment documented the temporal pattern of colonization of large-mesh cylinders by the small, first-year-class larvae during a 30-day period; the results are consistent with passive (density-independent) colonization. A second field experiment examined the effect of large, second-year-class larvae at densities of 1 or 3 per cylinder (14 or 42 m-2) on colonization by small larvae; this colonization was inhibited at the high density of large larvae. In the laboratory experiment, when larvae of the two size-classes were together in the same aquarium, small larvae moved around less than when by themselves (dispersal inhibition). Thus the inhibition of colonization observed in the field may result from interference mortality, rather than from a flight response to the presence of larger conspecifics. To evaluate this interpretation, the third field experiment measured the in-situ functional response of large larvae to each other and to their small conspecific prey. Results suggest a type 1 (linear) functional response, with feeding inteference among large larvae. Moreover, the interference mortality inflicted by larger larvae on smaller conspecifics was apparently more intense on larger individuals within the small size-class. Taken together, the three field experiments and a statistical power analysis show how colonization and interference interact to determine the local density of small larvae, and why such interference effects are difficult to detect experimentally in the field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00378720
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...