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  • Digitale Medien  (16)
  • 1990-1994  (14)
  • 1900-1904  (2)
  • 1993  (4)
  • 1992  (4)
  • 1990  (6)
  • 1903  (2)
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Materialart
  • Digitale Medien  (16)
Erscheinungszeitraum
  • 1990-1994  (14)
  • 1900-1904  (2)
Jahr
Schlagwörter
  • 1
    Digitale Medien
    Digitale Medien
    Improved stability of thin cobalt disilicide films using BF2 implantation (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 61 (1992), S. 2920-2922 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The thermal stability of ∼50 nm CoSi2 and TiSi2 thin films after BF2+ implantation was investigated. The electrical characteristics of silicide films were evaluated after high temperature annealing as a function of implanted BF2+ energy. It was observed that implantation with a projected range near the silicide/silicon interface produced the most stable films. The silicide/silicon interface morphology was investigated using scanning tunneling microscopy, where with appropriate BF2 implantation conditions, smoother interfaces were seen after high temperature annealing. The stabilizing effect is attributed to fluorine segregation into the silicide grain boundaries and at the silicide/silicon interface.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.108022
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  • 2
    Digitale Medien
    Digitale Medien
    Water availability in a restored soil (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Soil use and management 8 (1992), S. 0 
    Details
    ISSN: 1475-2743
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract. The water contents of a restored and an undisturbed soil were monitored over two ‘dry’ growing seasons in order to examine the differences in crop water availability from different horizons. Bulk density was approximately 10% greater in the topsoil of restored land than in undisturbed land, and the water holding capacity was less, probably because there was less organic matter. In the subsoil a major problem was the inability of the soil to allow winter rainfall to recharge the water reserves. Bulk density and penetration resistance were greater in the restored subsoil than in the undisturbed subsoil. Increases in penetration resistance on drying may have restricted rooting activity, especially in the restored subsoil.Ripping of the subsoil to a depth greater than the usual 0.5 m, possibly early in the year in a grass crop to allow new root growth to exploit the cracks, may increase water availability for future dry seasons.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1475-2743.1992.tb00897.x
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  • 3
    Digitale Medien
    Digitale Medien
    The immunology of primary sclerosing cholangitis (1990)
    Springer
    Springer seminars in immunopathology 12 (1990), S. 121-128 
    Details
    ISSN: 1432-2196
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Conclusion A number of recent studies have been discussed which provide strong evidence that genetic and immunological factors are important in the pathogenesis of PSC. Current evidence suggests that PSC is, like primary biliary cirrhosis, an immunologically mediated disease [8]. It seems likely that the immunological destruction of the biliary system is triggered in genetically predisposed individuals by viruses or bacteria [8]. The association with ulcerative colitis may be explained by the passage of viral or bacterial organisms across the damaged colonic epithelial barrier into the systemic circulation. Further studies are needed to confirm this attractive hypothesis.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00192687
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  • 4
    Digitale Medien
    Digitale Medien
    Interactions between two neurons in contact chemosensilla of the grasshopper, Schistocerca americana (1990)
    Springer
    Journal of comparative physiology 167 (1990), S. 431-436 
    Details
    ISSN: 1432-1351
    Schlagwort(e): Contact chemosensilla ; Grasshopper ; Inhibition ; Nicotine
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary The tibial contact chemosensilla of Schistocerca americana contain several neurons, one of which responds to nicotine hydrogen tartrate and certain other compounds. The activity of this cell is sometimes briefly interrupted by the firing of a second cell in the same sensillum which usually only fires a few times in the first 500 ms of a stimulation. The evidence suggests that the nicotine-sensitive cell is directly inhibited by the activity of the second cell. Not all cells in the sensillum produce the same effect.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00192578
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  • 5
    Digitale Medien
    Digitale Medien
    Of animals and men (1992)
    [s.l.] : Nature Publishing Group
    Nature 357 (1992), S. 187-187 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] SIR - I was surprised that Nature1 thought it necessary to make something of a conundrum of the fact that Charles Darwin was a strong supporter of physiology and recognized the need for experiment on animals. In 1875, largely in response to a vigorous antivivisection-ist campaign, the Cardwell ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/357187a0
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  • 6
    Digitale Medien
    Digitale Medien
    A Simple Form of Tide Predictor (1903)
    [s.l.] : Nature Publishing Group
    Nature 68 (1903), S. 322-322 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] FOR the past four years a very simple form of tide-predicting machine, the invention of Captain A. Inglis, the harbour-master, has been in use at Port Adelaide for the construction of the yearly published tide tables. The tides at Port Adelaide are rather peculiar in their behaviour, this being ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/068322a0
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  • 7
    Digitale Medien
    Digitale Medien
    Tides at Port Darwin (1903)
    [s.l.] : Nature Publishing Group
    Nature 68 (1903), S. 295-295 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] ALONG the north-west coast of Australia the tidal wave, flowing in from the Indian Ocean, produces at most places a large rise and fall. At Port Darwin the mean spring range is about 24 feet, but the range is sometimes as much as 30 feet. A tide gauge of Lord Kelvin's pattern was set up here by ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/068295b0
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  • 8
    Digitale Medien
    Digitale Medien
    The effect of oximes on the dihydropyridine-sensitive Ca current of isolated guinea-pig ventricular myocytes (1993)
    Springer
    Pflügers Archiv 422 (1993), S. 325-331 
    Details
    ISSN: 1432-2013
    Schlagwort(e): Myocyte ; Voltage clamp ; Ionic currents ; Oximes
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Exposure of isolated guinea-pig ventricular myocytes to the uncharged oximes 2,3 butanedionemonoxine (BDM) and norPAM (but not by the charged PAM) results in a dose-dependent reduction of the duration of the action potential. The nifedipine-sensitive Ca current is fully inhibited by BDM (IC505.8±0.4 mM) and nor PAM but is little affected by PAM. This inhibition is unaltered by the presence of BAY K 8644 but is antagonized by isoprenaline. The effect of isoprenaline is more pronounced when the solution in the patch pipette contains the non-hydrolysable analogue of adenosine 5′-triphosphate, ATPγS (the IC50 is increased to 44.0±5.2 mM). A hastening of the inactivation of the L-type Ca current persists when either 10 mM 1,2-bis(2-aminophenoxy)-ethane-N, N, N′, N-tetraacetic acid (BAPTA) or 3 mM ATPγS is present in the pipette solution or when BAY K 8644 or isoprenaline are present in the bathing fluid. These results suggest that the inhibition of the Ca current is due to the phosphatase-like activity of the oximes but differs in some respects from previous work where a reduced level of phosphorylation is achieved by the introduction of protein kinase inhibitors or protein phosphatases into the sarcoplasm in guinea-pig myocytes. These differences could be explained if Ca channel availability is regulated by at least two sites of cAMP-dependent phosphorylation with oximes able to rapidly dephosphorylate both sites, while one of these sites is not readily dephosphorylated by the endogenous phosphatases.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00374287
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  • 9
    Digitale Medien
    Digitale Medien
    A novel resin-filled ion-sensitive micro-electrode suitable for intracellular measurements in isolated cardiac myocytes (1990)
    Springer
    Pflügers Archiv 416 (1990), S. 196-200 
    Details
    ISSN: 1432-2013
    Schlagwort(e): Myocyte ; Intracellular ions
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract A method for the manufacture of ion-sensitive micro-electrodes, which can be readily used with small single cells, is described in detail. A glass pipette with a tip size of 1 μm, essentially similar to those used as suction electrodes in whole-cell recording, when silanized and with its tip filled with a suitable ion-sensitive resin, producesan ion-sensitive electrode with fast electrical and chemical response times. These electrodes can be applied to the cell membrane of isolated myocytes and penetration achieved without cell damage, by the application of suction. For the estimation of intracellular ionic activities they can be used in conjunction with a separate conventional KCl-filled micro-electrode or a suction voltage electrode. The technique is illustrated by the measurement of intracellular Na+, Ca2+ and pH. It is possible that these electrodes can also be used to measure local changes in ionic activity in restricted areas.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00370242
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  • 10
    Digitale Medien
    Digitale Medien
    Olfactory sensitivity of gomphocerine grasshoppers to the odours of host and non-host plants (1990)
    Springer
    Entomologia experimentalis et applicata 55 (1990), S. 205-212 
    Details
    ISSN: 1570-7458
    Schlagwort(e): Olfactory sensitivity ; grasshoppers ; electroantennogram ; Larrea ; hostplant
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Beschreibung / Inhaltsverzeichnis: Résumé Les réponses antennaires ont été examinées par électroantennogramme aux odeurs de plantes hôtes et non hôtes d'orthoptères Gomphocerinae de comportements alimentaires différents: Bootettix argentatus, monophage sur une dicotylédone, Larrea; Ligurotettix coquilletti, oligophage de dicotylédones; Cibolacris parviceps, polyphage; Chorthippus curtipennis, graminivore. Les types de réponse des quatre espèces étaient très voisins, mais les réponses aux odeurs de Larrea de B. argentatus et L. coquilletti, spécialistes de cette plante, étaient relativement plus fortes. Ces résultats suggèrent une similarité globale considérable dans la composition des populations de récepteurs olfactifs de ces quatre espèces d'orthoptères mais aussi une certaine spécificité pour les odeurs de la plante hôte au niveau antennaire.
    Notizen: Abstract Antennal responses to host and non-host odours were recorded, using the electroantennogram technique, from four gomphocerine grasshoppers with different feeding habits: Bootettix argentatus (monophagous on Larrea, a dicotyledonous plant), Ligurotettix coquilletti (oligophagous on dicotyledonous plants), Cibolacris parviceps (polyphagous) and Chorthippus curtipennis (graminivorous). The patterns of responses across the plant odours were similar for all four grasshopper species, but there was a relatively greater response to the odour of Larrea in B. argentatus and L. coquilletti which specialise on this plant. This suggests that there is considerable overall similarity in the make up of the olfactory receptor populations of these four grasshoppers species, but that some specificity for hostplant odour does exist at the antennal level.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00190659
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