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  • 1990-1994  (4)
  • 1975-1979  (3)
  • 1915-1919
  • 1993  (4)
  • 1975  (3)
  • 1
    Digitale Medien
    Digitale Medien
    The importance of palpation in food selection by a polyphagous grasshopper (Orthoptera: Acrididae) (1993)
    Springer
    Journal of insect behavior 6 (1993), S. 79-91 
    Details
    ISSN: 1572-8889
    Schlagwort(e): associative learning ; grasshopper ; palpation ; plant surface
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The behavioral responses of final-instar nymphs of Schistocerca americanato a variety of acceptable and unacceptable plants were recorded. Palpation occurred on all plants and the palps are involved in both acceptance and rejection. On most unacceptable plants, rejection was at first dependent on biting the leaf, but subsequently on Lantana, Machaeranthera, Moms,and Physalis,rejection often occurred after palpation of the surface alone. This is consistent with the suggestion that associative learning occurs. This response did not wane even when the insects had been without food for over 2 h. There was also some evidence of an innate response to the surface characteristics of Physalis.The features of the surfaces that produced these responses were not determined.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01049149
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  • 2
    Digitale Medien
    Digitale Medien
    Cerebral intraventricular haemorrhage in a young adult (1993)
    Springer
    International journal of legal medicine 105 (1993), S. 243-245 
    Details
    ISSN: 1437-1596
    Schlagwort(e): Intraventricular haemorrhage ; Head injury ; Traumatic subarachnoid haemorrhage ; Intraventrikuläre Blutung ; Kopftrauma ; Traumatische Subarachnoidalblutung
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin , Rechtswissenschaft
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Der Fall eines 26 Jahre alten Mannes wird beschrieben, welcher nach einer Episode von Traumen eine tödliche intraventrikuläre Hirnblutung erlitt. Bei der Obduktion wurde nach dem ersten Eindruck eine traumatische Subarachnoidalblutung vermutet, und die anfängliche Untersuchung war daher auf die Strukturen des Halses und auf die Vertebralarterien gerichtet, jedoch mit negativen Resultaten. Die Sektion des fixierten Gehirns zeigte eine massive intraventrikuläre Blutung mit sekundärer Beteiligung des Subarachnoidalraums und Ausbreitung in das Hirnparenchym. Keine Blutungsquellen oder natürliche Erkrankungen der Hirngefäße konnten gefunden werden. Die praktischen Aspekte der Diagnose und der vorsichtige Ansatz, welcher notwendig ist, um Subarachnoidalblutungen zu interpretieren, werden betont. Die Bedeutung der intraventrikulären Blutung nach Trauma ist mit der Einführung der Computertomographie offensichtlicher geworden. Die Implikationen dieses und ähnlicher Fälle werden bedacht.
    Notizen: Summary A case of a 26-year-old man who suffered a fatal intraventricular cerebral haemorrhage following an episode of trauma is described. The initial appearance at necropsy suggested a traumatic subarachnoid haemorrhage and initial investigation was directed towards the anterior neck structures and the vertebral arteries with negative results. Dissection of the fixed brain showed a massive intraventricular bleed with secondary involvement of the subarachnoid space and dissection into the cerebral parenchyma. No bleeding points or natural disease of the cerebral vessels could be identified. The practical aspects of diagnosis and the cautious approach necessary in interpreting subarachnoid bleeding is emphasised. The significance of intraventricular haemorrhage following trauma has become more apparent with the advent of computed tomographic scanning. The implications for this and similar cases are considered.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01642802
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  • 3
    Digitale Medien
    Digitale Medien
    OSO-7 results on coronal emission near 304 Å (1975)
    Springer
    Solar physics 43 (1975), S. 337-350 
    Details
    ISSN: 1573-093X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The spectral composition and spatial distribution of equatorial coronal emission near 304 Å is examined. Spectral scans indicate that the predominant line is from Si xi. Comparisons of observations with calculations of intensity changes with altitude indicate that collisional excitation is important near the Sun but that photoexcitation becomes dominant beyond about 1.3 R ⊙ from the solar center. Observed and calculated intensities are in approximate agreement for abundances and electron densities that are within the range of observed values.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00152358
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  • 4
    Digitale Medien
    Digitale Medien
    Abundance of Fe relative to H at 1.5 solar radii (1975)
    Springer
    Solar physics 42 (1975), S. 487-496 
    Details
    ISSN: 1573-093X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The abundance of Fe relative to H is obtained by using resonantly scattered intensities of λ 284 of Fe XV that were measured with OSO-7 and resonantly scattered intensities of Lα of H I that were obtained by Gabriel (1971). Because of possible differences in electron densities along lines of sight for these non-simultaneous measurements and in relative calibrations, results are rather uncertain but still indicate that the average Fe abundance relative to H in the corona appears to be at least as large as a recent photospheric abundance. Some limitations in using this method for obtaining abundances are examined for future experiments with simultaneous measurements and well calibrated detectors.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00149928
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  • 5
    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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  • 6
    Digitale Medien
    Digitale Medien
    Exploration geochemistry—Distribution of elements and recognition of anomalies (1975)
    Springer
    Mathematical geology 7 (1975), S. 415-446 
    Details
    ISSN: 1573-8868
    Schlagwort(e): data processing ; discriminant analysis ; graphics ; mapping ; sampling ; simulation ; geochemistry
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Mathematik
    Notizen: Abstract The exploration geochemist faces a serious problem in reconciling theoretical statistics with the empirical distribution of elements in materials in the earth's crust. The results of computer-simulation experiments being conducted by the Exploration Geochemistry Group at the University of New Brunswick illustrate some of the problems of the relation between frequency distributions and spatial distributions of elements and raise some interesting questions about sampling patterns and physical size of samples. Most importantly, the simulation experiments and empirical examples support the contention that attempts to make an assumption of normality more efficient by performing log transformations on positively skewed data may defeat the purpose of statistical analysis for exploration work. New developments in computer-data presentation and interpretation, including population sorting and classification, illustrate the increasing use of the computer in exploration geochemistry.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02080498
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  • 7
    Digitale Medien
    Digitale Medien
    Miticide bioassays with spider mites (Acari: Tetranychidae): effect of test method, exposure period and mortality criterion on the precision of response estimates (1993)
    Springer
    Experimental and applied acarology 17 (1993), S. 695-708 
    Details
    ISSN: 1572-9702
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Six different bioassay methods were evaluated using propargite (Omite 30% wettable powder (WP) and fenbutatin oxide (Torque 50% (WP) and 55% suspension concentrate (SC)) with twospotted spider mite, Tetranychus uriticae Koch (TSM) and European red mite, Panonychus ulmi Koch (ERM) to document their utility and precision for estimating median lethal concentrations (LC). For each method, two post-treatment exposure periods and mortality criteria were used. Post-treatment exposure period and mortality criterion had a significant influence on the precision of LC50 estimates for all tested miticides with all bioassays methods. Twenty four hour (h) post-treatment exposure was found to be the most suitable for the slide dip and Petri dish methods while 48h was the most appropriate for leaf disc methods. Scoring moribund mites as dead was the most satisfactory criterion for ensuring that biossays were as simple and precise as possible. The Petri dish residue-Potter tower method (PDR-PT) estimated the responses of TSM and ERM to propargite with high precision. The same method was not as precise for fenbutatin oxide formulations. Because significant mite run-off occurred with the leaf disc methods, their precision was not fully established. The slide dip method gave less precise estimates of LC50 values for propargite (WP) and fenbutatin oxide (WP), while the same method gave more precise LC50 estimates for fenbutatin oxide (SC) than the PDR-PT method. The toxicity of candidate miticides was found to be method-and species-dependent.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00058509
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