GLORIA

GEOMAR Library Ocean Research Information Access

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
  • 1
    Electronic Resource
    Electronic Resource
    Phenotypic plasticity of Ammannia spp. in competition with rice (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Weed research 37 (1997), S. 0 
    Details
    ISSN: 1365-3180
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The annual broadleaved weeds Ammannia auriculata Wild, and A. coccinea Rottb. are widespread and competitive in California rice (Oryza sativa L.) fields. We studied Ammannia spp. biology in a greenhouse pot experiment. Weeds were grown alone and in competition with rice (cv. M–202), and harvested six times over 122 days. Compared with growth alone, competition reduced Ammannia spp. total plant dry weight (DW), shoot DW and leaf area in all but the first harvest. However, weed height differed at only one harvest (85 days after planting). Ammannia spp. responded to competition with increased shoot:root DW ratios, increased stem:other shoot DW ratios, decreased stem diameters, fewer but elongated internodes and fewer branches. This suggests that light capture was more important than nutrient capture for maintaining Ammannia spp. growth. The weeds appear to lodge easily in rice fields because competitive growth responses make them top heavy and unstable. Weed seed DW declined by 97% in competition, which showed the importance of crop interference to Ammannia spp. control. Plasticity may help Ammannia spp. to escape common control practices (e.g. high crop plant densities or early herbicide application), and probably contributes to its widespread distribution. Thus, Ammannia spp. plasticity should be more fully considered when designing management strategies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3180.1997.tb01820.x
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Studies of the effects of inhaled magnesium on airway reactivity to histamine and adenosine monophosphate in asthmatic subjects (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Clinical & experimental allergy 27 (1997), S. 0 
    Details
    ISSN: 1365-2222
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Background Magnesium is a cation with smooth muscle relaxant and anti-inflammatory effects and may therefore have a role in the therapy of asthma. Several studies have investigated the effects of intravenous magnesium in acute or stable asthma, but little is known about the effects of inhaled magnesium.Objective To measure the effects of a single inhaled nebulized dose of 180 mg magnesium sulphate on airway reactivity to a direct-acting bronchoconstrictor (histamine) and an indirect-acting bronchoconstrictor (adenosine monophosphate [AMP]) in asthmatic subjects.Objective Two separate randomized, double-blind, placebo-controlled crossover studies, each involving 10 asthmatic subjects. In the histamine study, airway reactivity to histamine was measured and lung function allowed to recover spontaneously over 50 min before administering nebulized magnesium sulphate or saline placebo. Airway reactivity to histamine was then measured at 5 and 50 min. In the AMP study, a single measurement of airway reactivity was made 5 min after magnesium or placebo.Results In the histamine study, the provocative dose required to reduce FEV1 by 20% (PD20FEV1) was significantly lower after magnesium than after placebo, by a mean (95% CI) of 1.02 (0.22–1.82) doubling doses at 5 min (P= 0.018), and 1.0 (0.3–1.7) doubling doses at 50 min (P= 0.01). In the AMP study, PD20FEV1 was also significantly lower at 5 min after magnesium than after saline, by 0.64 (0.12–1.16) doubling doses (P= 0.023), though this difference was not statistically significant after adjustment for differences in baseline FEV1 on the two study days.Conclusions Inhaled magnesium did not protect against the effects of these direct and indirect bronchoconstrictor stimuli in subjects with asthma, and may have increased airway reactivity to histamine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2222.1997.tb00743.x
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Photomicrographic atlas of Atlantic herring embryonic development (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 51 (1997), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The development of the Atlantic herring is related to a staging series intended to provide a standard background for studies of herring embryonic development. The series is based on herring embryos from the Isle of Man (Irish Sea) stock reared at 8°C. The stages are named rather than numbered in order to simplify usage and the series has been sub-divided into five periods: zygote and cleavage, blastula, gastrula, segmentation, and organogenesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1997.tb01535.x
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    A High-Energy Monochromatic Laue (MonoLaue) X-ray Diffuse Scattering Study of KMnF3 using an Image Plate (1997)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 30 (1997), S. 16-20 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The technique of high-energy monochromatic Laue X-ray scattering using image plates to record the diffraction patterns is presented. A tunable wiggler beamline is used as an X-ray source. It is shown that such experimental conditions present many advantages over conventional tube sources and photographic films. A study of diffuse scattering in the perovskite compound KMnF3 is presented to illustrate this in a qualitative way.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889896000696
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    An X-ray-induced insulator–metal transition in a magnetoresistive manganite (1997)
    [s.l.] : Nature Publishing Group
    Nature 386 (1997), S. 813-815 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The x = 0 and x = 1 end-members of the Pr!_xCaxMnO3 family are insulating antiferromagnets with the manganese ion in the Mn3+ and Mn4+ valence states, respectively10. For intermediate x, the average Mn valence is non-integer and the material is generally semiconducting or metallic at high ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/386813a0
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Nestling obesity in procellariiform seabirds: temporal and stochastic variation in provisioning and growth of short-tailed shearwaters Puffinus tenuirostris (1997)
    Springer
    Oecologia 112 (1997), S. 4-11 
    Details
    ISSN: 1432-1939
    Keywords: Key words Procellariiformes ; Nutrition ; Obesity ; Chick growth ; Life history
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Procellariiform seabirds such as short-tailed shearwaters Puffinus tenuirostris accumulate large quantities of lipid during the nestling period. The functional significance of this pattern of development remains unclear, but has been related both to temporal variation in feeding conditions around the colony and to stochastic variation in the foraging success of individual parents. This paper examines temporal and age-specific variation in the pattern of food delivery to nestling short-tailed shearwaters, which have one of the lowest provisioning rates of any procellariiforms and are known to experience occasional long intervals between feeds. We assess whether variation in the provisioning rates of chicks was associated primarily with temporal variation in food delivery at the level of the colony or with stochastic variation in food delivery at the level of the individual. We then discuss this variability in the context of nestling obesity. For all but the youngest chick age-classes, individual meals delivered by adults averaged 141 g, which was 25% of adult body mass. The proportion of chicks fed each night was low (49%) and highly variable (coefficient of variation = 82%), which means that occasional long intervals between feeds would be expected to arise simply by chance. In keeping with this, intervals between feeding events for individual chicks followed a negative exponential distribution with a mean of 2 nights and a maximum interval of 13 nights. There was significant temporal variation in food delivery, but deviations from expected values for both feeding frequency and meal size were restricted to a small number of nights, included values both higher and lower than expected and did not persist for more than 2 nights in succession. These data suggest that even among those species with very low feeding frequencies and occasional long intervals between feeds, nestling obesity in Procellariiformes should be regarded as a response to chronic stochastic variability in food delivery at the level of the individual chick rather than as insurance against sporadic temporal variation at the level of the colony.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004420050276
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    An adverse matching effect for the HLA-B locus in corneal transplantation (1997)
    Springer
    Transplant international 10 (1997), S. 145-149 
    Details
    ISSN: 1432-2277
    Keywords: Key words Corneal transplantation ; HLA-B locus ; HLA-B locus ; corneal transplantation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The results of tissue typing on 115 recipient/donor pairs prior to corneal grafting were analyzed with the proportional hazard regression model for the incidence of the first rejection episode and for graft failure from rejection. Like other investigators, we found that a previously failed corneal graft and the degree of recipient corneal vascularization were significant risk factors for graft rejection. ABO blood group matching had no effect. The absence of mismatches in both the HLA-A and HLA-DR loci decreased the incidence of rejection. However, no difference was observed for the presence of one versus two mismatches. Regression results for the HLA-A and DR loci were not significant. Surprisingly, matching for one or both HLA-B alleles resulted in a significantly higher incidence of graft rejection episodes (P 〈 0.005) and of graft failure (P 〈 0.052). This adverse matching effect for the B locus was proportional to the number of mismatches.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001470050029
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    The velocity equations for dilatant granular flow and a new exact solution (1997)
    Springer
    Zeitschrift für angewandte Mathematik und Physik 48 (1997), S. 1-8 
    Details
    ISSN: 0044-2275
    Keywords: Key words.Plastic regimes, kinematically determined, granular materials, optimal systems, exact solutions.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract. For axially symmetric flow of dilatant granular materials, the velocity equations uncouple from the stress equations in certain plastic regimes, and assuming dilatant double shearing a set of three first order partial differential equations are obtained. These equations turn out to be deceptive because although simple in appearance, the determination of simple exact solutions is non-trivial. Here we show that all the known functional forms of existing solutions also arise systematically by consideration of the "optimal systems" of the classical Lie symmetries which indicates that any further solution types most likely arise from non-classical symmetries. For one of the known families we present a special case which admits a particularly simple closed form expression, which has not been previously given in the literature. For this particular special case the integral curves (streamlines) can be readily obtained as well as a simple analytical "approximation" for the particle paths. The streamlines and the validity of the analytical approximation are shown graphically.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00001461
    Location Call Number Limitation 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...