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  • 1
    Electronic Resource
    Electronic Resource
    Evidence for nystatin micelles in L-cell membranes from fluorescence photobleaching measurements of diffusion (1986)
    s.l. : American Chemical Society
    Biochemistry 25 (1986), S. 177-181 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00349a026
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  • 2
    Electronic Resource
    Electronic Resource
    Distributions of fluorescence decay times for parinaric acids in phospholipid membranes (1987)
    s.l. : American Chemical Society
    Biochemistry 26 (1987), S. 6272-6277 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00393a047
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  • 3
    Electronic Resource
    Electronic Resource
    Direct diffusion measurements of naphthacene on chemically derivatized silica gels (1991)
    s.l. : American Chemical Society
    Langmuir 7 (1991), S. 2821-2826 
    Details
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/la00059a067
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  • 4
    Electronic Resource
    Electronic Resource
    Synthesis and surfactant behavior of an unusual cyclic triester based on a cis,cis-1,3,5-cyclohexanetriol headgroup (1991)
    s.l. : American Chemical Society
    Langmuir 7 (1991), S. 2425-2427 
    Details
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/la00059a004
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Monolayers of Polylauroyl Macrocyclic Polyamides and Nitrobenzoxadiazole (NBD) Labeled Polylauroyl Macrocyclic Polyamides at the Air-Water Interface (1994)
    s.l. : American Chemical Society
    Langmuir 10 (1994), S. 4630-4636 
    Details
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/la00024a040
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Inverse kinematic problem for a random gradient medium in geometric optics approximation (1990)
    Springer
    Pure and applied geophysics 132 (1990), S. 417-437 
    Details
    ISSN: 1420-9136
    Keywords: Scattering ; random inhomogeneities ; travel time ; inversion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Scattering at random inhomogeneities in a gradient medium results in systematic deviations of the rays and travel times of refracted body waves from those corresponding to the deterministic velocity component. The character of the difference depends on the parameters of the deterministic and random velocity component. However, at great distances to the source, independently of the velocity parameters (weakly or strongly inhomogeneous medium), the most probable depth of the ray turning point is smaller than that corresponding to the deterministic velocity component, the most probable travel times also being lower. The relative uncertainty in the deterministic velocity component, derived from the mean travel times using methods developed for laterally homogeneous media (for instance, the Herglotz-Wiechert method), is systematic in character, but does not exceed the contrast of velocity inhomogeneities by magnitude. The gradient of the deterministic velocity component has a significant effect on the travel-time fluctuations. The variance at great distances to the source is mainly controlled by shallow inhomogeneities. The travel-time flucutations are studied only for weakly inhomogeneous media.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00874372
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  • 7
    Electronic Resource
    Electronic Resource
    A sensitive method for determining nitrogen-15 isotope in urea (1997)
    Springer
    Marine biology 128 (1997), S. 191-195 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A method is presented in which the 15N at.% of urea is determined with high precision on liquid samples containing as little as 10 nmol of urea. The method involves removal of interference from NH4 + initially present in the sample by cation exchange. Urea in the sample is subsequently hydrolyzed to NH4 + by the enzyme urease. Liberated NH4 + is separated from the alkaline sample by diffusion as NH3 through a helium gas phase where it is finally oxidized to N2 by reaction with hypobromite iodine. The isotopically labeled N2 thus formed is mixed with the N2 initially present in the sample, and the 15N at.% of urea is calculated from the relative amounts of 14N15N and 15N15N by means of the isotope pairing principle. The presented method for 15N-urea analysis proved to be precise (SE 〈 0.4 at.%, n = 5), when applied on both marine and freshwater samples with an 15N enrichment 〉1 at.%, and interference was found only from volatile methyl amines.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002270050082
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  • 8
    Electronic Resource
    Electronic Resource
    Gating of somatosensory evoked potentials during voluntary movement of the lower limb in man (1998)
    Springer
    Experimental brain research 120 (1998), S. 143-152 
    Details
    ISSN: 1432-1106
    Keywords: Key words Somatosensory evoked potential ; Gating ; H-reflex ; Voluntary movement ; Human
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Somatosensory evoked potentials (SEPs) evoked by stimulation of the tibial nerve (TN) in the popliteal fossa, the sural nerve (Sur) at the lateral malleole, and an Achilles tendon (Achilles) tap were recorded before and during voluntary plantarflexion, dorsiflexion, and cocontraction of the ipsi- and contralateral foot in normal subjects. Suppression (gating) of the TN-SEP began around 60 ms before the onset of electromyographic activity (EMG), and became maximal 50–100 ms after the onset of EMG. Similar gating was observed for the SEP evoked by activation of muscle afferents (Achilles) and cutaneous afferents (Sur). The TN-SEP was similarly depressed at the onset of a plantarflexion as at the onset of dorsiflexion. A depression, although much smaller, was also observed at the onset of movement of the contralateral limb. The depression of the TN-SEP after the onset of EMG decreased when fast-conducting afferents were blocked by ischemia below the knee joint. The TN-SEP was equally depressed during tonic dorsiflexion, plantarflexion, and cocontraction of dorsi- and plantarflexors. The TN-SEP was depressed for up to 300 ms when preceded by stimulation of Sur or a biceps femoris tendon tap. Gating of lower limb SEPs thus appears to have both central and peripheral components of which neither seems to be specific for the muscle being contracted or the sensory afferents being stimulated. We encourage that caution is taken when drawing functional conclusions regarding movement-specific modulation of afferent inflow to the somatosensory cortex based on observations of gating of lower limb SEP.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002210050388
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  • 9
    Electronic Resource
    Electronic Resource
    Recruitment of extensor-carpi-radialis motor units by transcranial magnetic stimulation and radial-nerve stimulation in human subjects (1999)
    Springer
    Experimental brain research 128 (1999), S. 557-562 
    Details
    ISSN: 1432-1106
    Keywords: Key words H-reflex ; Motor units ; Motor evoked potentials ; Motoneuron recruitment ; Transcranial magnetic stimulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  The responses of 34 extensor-carpi-radialis motor units to graded transcranial magnetic stimulation (TMS) and electrical stimulation of the radial nerve were investigated in six human subjects. Simultaneously with the recording of the single motor-unit discharges, motor-evoked potentials (MEPs) and H-reflexes evoked by the two types of stimulation were recorded by surface electrodes and expressed as a percentage of the maximal motor response (Mmax). Ten motor units were activated in the H-reflex when it was less than 5% of Mmax, but not in the MEP even when it was 15% of Mmax. The opposite was observed for three motor units. Eleven motor units were recruited by both stimuli, but with significantly different recruitment thresholds. Only ten motor units had a threshold similar to TMS and radial nerve stimulation. From these observations, we suggest that caution should be taken when making conclusions regarding motor cortical excitability based on changes in the size of MEPs, even when it is ensured that there are no similar changes in background EMG-activity or H-reflexes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002210050881
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  • 10
    Electronic Resource
    Electronic Resource
    Evidence suggesting that a transcortical reflex pathway contributes to cutaneous reflexes in the tibialis anterior muscle during walking in man (1999)
    Springer
    Experimental brain research 124 (1999), S. 59-68 
    Details
    ISSN: 1432-1106
    Keywords: Key words Long-latency reflexes ; Magnetic brain stimulation ; Sensory feedback
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Stimulation of cutaneous foot afferents has been shown to evoke a facilitation of the tibialis anterior (TA) EMG-activity at a latency of 70–95 ms in the early and middle swing phase of human walking. The present study investigated the underlying mechanism for this facilitation. In those subjects in whom it was possible to elicit a reflex during tonic dorsiflexion while seated (6 out of 17 tested), the facilitation in the TA EMG evoked by stimulation of the sural nerve (3 shocks, 3-ms interval, 2.0–2.5× perception threshold) was found to have the same latency in the swing phase of walking. The facilitation observed during tonic dorsiflexion has been suggested to be – at least partly – mediated by a transcortical pathway. To investigate whether a similar mechanism contributes to the facilitation observed during walking, magnetic stimulation of the motor cortex (1.2× motor threshold) was applied in the early swing phase at different intervals in relation to the cutaneous stimulation in 17 subjects. In 13 of the subjects, the motor potentials evoked by the magnetic stimulation (MEPs) were more facilitated by prior sural-nerve stimulation (conditioning-test intervals of 50–80 ms) than the algebraic sum of the control MEP and the cutaneous facilitation in the EMG when evoked separately. In four of these subjects, a tibialis anterior H-reflex could also be evoked during walking. In none of the subjects was an increase of the H-reflex similar to that for the MEP observed. In five experiments on four subjects, MEPs evoked by magnetic and electrical cortical stimulation were compared. In four of these experiments, only the magnetically induced MEPs were facilitated by prior stimulation of the sural nerve. We suggest that a transcortical pathway may also contribute to late cutaneous reflexes during walking.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002210050600
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