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  • 1990-1994  (38)
  • 1980-1984
  • 1991  (38)
  • 11
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Grass and forage science 46 (1991), S. 0 
    ISSN: 1365-2494
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Preliminary studies were carried out on the effect of stocking rate during late autumn on a continuously stocked Lolium perenne-dominated sward at an upland site in central Scotland. Measurements were made of L. perenne tiller population density on 29 September and 2 November and of L. perenne net production, mean sward height and total herbage mass in early and late October and early and late November. Stocking rates were 12 ewes per ha during October and 8 and 16 ewes per ha during November. Sward height and herbage mass declined with time and more rapidly at the higher stocking rate. L. perenne growth per tiller and per unit area was influenced by time but not by stocking rate and was closely related to the 5·5°C soil temperature at 10 cm depth. Tiller senescence was greatly reduced at the higher stocking rate and/or the consequentially lower sward height and herbage mass. Tiller net production was therefore sustained at a positive level on the higher stocked sward throughout November while on the lower stocked sward it fell below zero early in November.
    Type of Medium: Electronic Resource
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  • 12
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Pneumolysin, a membrane-damaging toxin, is known to activate the classical complement pathway. We have shown that 1 μg ml−1 of pneumolysin can activate complement, which is a much lower level than observed previously. We have identified two distinct regions of pneumolysin which show homology with a contiguous sequence within acute-phase proteins, including human C-reactive protein (CRP). Site-directed mutagenesis of the pneumolysin gene was used to change residues common to pneumolysin and CRP. Some of the modified toxins had a reduced ability both to activate complement and bind antibody. We suggest that the ability of pneumolysin to activate complement is related to its ability to bind the Fc portion of immunoglobulin G.
    Type of Medium: Electronic Resource
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  • 13
    Electronic Resource
    Electronic Resource
    Springer
    Planta 183 (1991), S. 209-217 
    ISSN: 1432-2048
    Keywords: Ethylene binding ; Pisum (ethylene binding)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Using in-vivo assays at least two classes of ethylene-binding site are shown to exist in pea epicotyls. These classes appear to have identical affinities for ethylene with a KD of 6 · 10−11-8 · 10−11 M; the fast associating class has high and appropriate affinities for physiologically active analogues of ethylene, and CO2 is without effect upon bfinding. Experiments involving suppression of endogenous ethylene production demonstrate that previous work may have underestimated both the amount of binding sites present and the affinity of such sites for ethylene. The apparent inhibition of binding by silver appears to be the consequence of a stimulation of endogenous ethylene production. The possible role of the sites as ethylene receptors is discussed.
    Type of Medium: Electronic Resource
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  • 14
    ISSN: 1432-1939
    Keywords: A/Ci ; C3 ; CAM ; Pi regeneration ; RuBP carboxylase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Seedlings of nine tropical species varying in growth and carbon metabolism were exposed to twice the current atmospheric level of CO2 for a 3 month period on Barro Colorado Island, Panama. A doubling of the CO2 concentration resulted in increases in photosynthesis and greater water use efficiency (WUE) for all species possessing C3 metabolism, when compared to the ambient condition. No desensitization of photosynthesis to increased CO2 was observed during the 3 month period. Significant increases in total plant dry weight were also noted for 4 out of the 5 C3 species tested and in one CAM species, Aechmea magdalenae at high CO2. In contrast, no significant increases in either photosynthesis or total plant dry weight were noted for the C4 grass, Paspallum conjugatum. Increases in the apparent quantum efficiency (AQE) for all C3 species suggest that elevated CO2 may increase photosynthetic rate relative to ambient CO2 over a wide range of light conditions. The response of CO2 assimilation to internal Ci suggested a reduction in either the RuBP and/or Pi regeneration limitation with long term exposure to elevated CO2. This experiment suggests that: (1) a global rise in CO2 may have significant effects on photosynthesis and productivity in a wide variety of tropical species, and (2) increases in productivity and photosynthesis may be related to physiological adaptation(s) to increased CO2.
    Type of Medium: Electronic Resource
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  • 15
    ISSN: 1432-1262
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Deux électrodes anales non invasives de contact d'un diamètre similaire ont été comparées, l'une avec les plaques d'électrode orientées circulairement dans le canal anal et l'autre avec les plaques suivant le grand axe du canal anal. II existait une augmentation significative de l'amplitude des signaux électriques enregistrés au repos et durant la contraction du sphincter anal externe pour les électrodes placées lonitudinalement chez 117 patients. Une contraction inappropriée du sphincter anal externe durant la défécation était plus facilement détectée en utilisant des électrodes longitudinales chez 52 patients explorés pour constipation irréductible. L'électrode longitudinale détectait l'amplitude de réponse au déclenchement du réflexe pudendo-anal plus facilement que l'électrode circulaire, mais chez 12 des 117 malades le signal électrique du réflexe pudendo-anal était soit absent, soit n'était pas détecté avec une électrode circonférentielle tandis que l'électrode longitudinale détectait la présence d'une réponse de basse amplitude chez 11 d'entre eux. La comparaison entre l'électrode lo et l'électrode invasive par fil d'acier inoxydable fin montrait trait une corrélation pour l'EMG de base du sphincter anal externe (r-0.91,p〈0.01), le tracé de contraction volontaire (r=0.99,p〈0.001) et le tracé de défécation (r=0.91,p〈0.01). Ainsi l'électrode longitudinale par plaque améliore l'enregistrement de l'activité électromyographique.
    Notes: Abstract Two non-invasive anal plug electrodes of similar size have been compared, one with the electrode plates orientated circularly in the anal canal and the other with the plates in the long axis of the anal canal. There was a significant increase in the amplitude in the EMG signals recorded at rest and during squeeze from the external anal sphincter with a longitudinally placed electrode in 117 patients. Inappropriate contraction of the external anal sphincter when straining at stool was more readily detected using the longitudinal electrode in 52 patients investigated for intractable constipation. The longitudily electrode detected the amplitude of the response to the elicitation of a pudeno-anal reflex more readily than the circular electrode. When in 12 of the 117 the pudenoanal reflex EMG signal was either absent or not detected with the circumferential plug electrode, the longitudinal electrode detected the presence of a low amplitude response in 11 of these. When the non-invasive longitudinal electrode was compared to invasive fine wire stainless steel electrodes, a correlation was found for extern anal sphincter resting EMG (r=0.99,p〈0.01), voluntary squeeze EMG (r=0.99,p〈0.001) and strain EMG (r=0.91,p〈0.01). The longitudinal anal plug electrode thus facilitates surface acquisition of EMG activity.
    Type of Medium: Electronic Resource
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  • 16
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    Unknown
    London, etc. : Periodicals Archive Online (PAO)
    Slavonic and East European review. 69:2 (1991:Apr.) 329 
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  • 17
    Electronic Resource
    Electronic Resource
    Springer
    Cancer chemotherapy and pharmacology 28 (1991), S. 315-317 
    ISSN: 1432-0843
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The pharmakokinetic profiles of intraperitoneally infused platinum analogues were determined in 13 women exhibiting minimal residual disease following surgery and systemic chemotherapy for epithelial ovarian cancer of fallopian tube carcinoma by following the disposition of tracer doses of195mPt radiolabel. Six patients received iproplatin, four were given cisplatin and three received carboplatin. The present data demonstrate no difference in the disposition of total platinum between these three analogues, but differences in the kinetics of free platinum may exist.
    Type of Medium: Electronic Resource
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  • 18
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract The acute toxicity (96-hr median lethal concentrations (LC50s) of ten chlorinated isomers of benzene, phenol, ethane, and ethylene to the American flagfish (Jordanella floridae) were determined in both static and flowthrough systems. Chronic toxicity to embryo-larval fish was also estimated from hatching success and post-hatch survival as well as fry growth rates and survival. Maximum acceptable toxicant concentrations (MATC) were estimated where possible. In general, for both acute and chronic toxicity tests, the order of increasing relative toxicity based on the water-borne exposure concentrations was: chloroethanes, chloroethylenes, chlorobenzenes, and chlorophenols. Within groups, more highly chlorinated isomers were usually more toxic. The presence of suspended or colloidal 1,2,4,5-tetrachlorobenzene was observed in acute toxicity testing and affected toxicity estimates.
    Type of Medium: Electronic Resource
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  • 19
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We investigated the developmental potential of cells carrying the paternal duplication of the region distal to the T(7B3; 15C)9H translocation breakpoint on Chr? (ref. 7) in chimaeras. Blastocysts carrying the paternal duplication of distal Chr 7 (PatDi7) were expected at a frequency of about 17% ...
    Type of Medium: Electronic Resource
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  • 20
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A mixture of fullerenes was synthesized by contact arc evaporation8 of graphite under 300 torr of He. After Soxhlet extraction with toluene, C60 was separated from the mixture by column chromatography on neutral alumina with 5% toluene in hexane as eluant. The purity of C60 was 〉99.9% relative to ...
    Type of Medium: Electronic Resource
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