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  • 1
    Electronic Resource
    Electronic Resource
    Characteristics of the sensory discharge of the muscle spindle in Xenopus laevis (1974)
    Springer
    Biological cybernetics 15 (1974), S. 99-110 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract Single isolated muscle spindles from the toad Xenopus laevis were studied with regard to their response to different levels of steady stretch and to their response to small precisely controlled length variations. The spectral distribution of the applied variations was designed to be essentially uniform in the region between 0.04 Hz and a number of selectable upper limits none exceeding 20 Hz. The results obtained relate to the statistics of receptor discharge intervals, to receptor transfer functions and to the coding and decoding of sensory information. The conclusion is that spectral analysis techniques can be used to clarify many aspects of muscle spindle behavior.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00270654
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  • 2
    Electronic Resource
    Electronic Resource
    A Linear Transfer Function underlying Impulse Frequency Modulation in a Cockroach Mechanoreceptor (1963)
    [s.l.] : Nature Publishing Group
    Nature 197 (1963), S. 699-700 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In the investigation reported here we have extended this work, following essentially the same theoretical and experimental approach except in details of apparatus and methods of data analysis. In our preparation the isolated femur was mounted by insect pins, which also served as recording ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/197699a0
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  • 3
    Electronic Resource
    Electronic Resource
    An Inherent Character of Plant Species of Drier Habitats (1957)
    [s.l.] : Nature Publishing Group
    Nature 180 (1957), S. 698-699 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THAT angiosperm species of drier habitats (excluding the succulents which have a different metabolic regime) have drier tissues than similar species of moister places, when each is observed in its modal habitat, has become established1-2. It is sometimes forgotten that the whole or greater part of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/180698a0
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  • 4
    Electronic Resource
    Electronic Resource
    Heinz Bodies in Extravasated Erythrocytes (1958)
    [s.l.] : Nature Publishing Group
    Nature 182 (1958), S. 455-455 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A similar type of fragmentation and distortion of the red cells is sometimes seen in hsemothorax fluids, and this led us to examine the red cells by supravital staining with methyl violet. By this means Heinz bodies were demonstrated in the majority of serous and cystic fluids, and sometimes in ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/182455a0
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  • 5
    Electronic Resource
    Electronic Resource
    Temperature dependence of termolecular association reactions N2+ + 2N2 .fwdarw. N4+ + N2 and O2+ + 2O2 .fwdarw. O4+ + O2 occurring in free jet expansions below 20 K (1989)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 93 (1989), S. 8031-8037 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100361a015
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  • 6
    Electronic Resource
    Electronic Resource
    Types of Motor Units in the Skeletal Muscle of Xenopus laevis (1968)
    [s.l.] : Nature Publishing Group
    Nature 217 (1968), S. 281-283 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Slow muscle fibres isolated from Xenopus laevis have been found to be histochemically1, functionally1,2 and structurally (unpublished results of R. S. Smith and S. Page) distinct from the two types of fast fibres. In our previous study1 of the group of slow fibres, we were unable to find evidence ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/217281a0
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  • 7
    Electronic Resource
    Electronic Resource
    Analysis of ytterbium arsenide films grown on GaAs by molecular beam epitaxy (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 99-101 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: X-ray photoelectron spectroscopy has been used to investigate thin single-crystal films of ytterbium arsenide grown epitaxially on GaAs by molecular beam epitaxy. Sputter profiles indicate the absence of oxide impurities and the presence of only trivalent ytterbium, which means that the epitaxial film is composed entirely of YbAs. X-ray diffraction analysis revealed a moderate imperfection of the crystalline quality of the YbAs and a lattice misfit of about 8×10−3 with respect to GaAs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100361
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  • 8
    Electronic Resource
    Electronic Resource
    Photoluminescence study on undoped single quantum well pseudomorphic structures (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 2158-2160 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this letter, photoluminescence results obtained from two different undoped multilayered pseudomorphic structures grown by molecular beam epitaxy are compared. Intense and spectrally narrow emission was observed from both GaAs/InxGa1−xAs/GaAs and AlxGa1−xAs/InxGa1−xAs/GaAs structures. Excitonic emission from the quantum wells was confirmed by measurements of photoluminescence excitation spectra. The intensity and temperature dependences of the photoluminescence also revealed emission arising from bound excitons and impurities in the quantum wells. Intrinsic and extrinsic emission from confined levels was confirmed by the recorded photoluminescence excitation spectra along with intensity and temperature dependences. In the asymmetric AlxGa1−xAs/InxGa1−xAs/GaAs structure large changes were observed in the photoluminescence intensity under continuous optical excitation which are caused by the optical excitation of defects in the ternary AlxGa1−xAs on top of the pseudomorphically grown InxGa1−xAs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100304
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  • 9
    Electronic Resource
    Electronic Resource
    Persistence of Axonal Transport in Isolated Axons of the Mouse (1993)
    Oxford, UK : Blackwell Publishing Ltd
    European journal of neuroscience 5 (1993), S. 0 
    Details
    ISSN: 1460-9568
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: We have examined the hypothesis, for the case of mouse axons, that isolating an axon from its cell body will lead to a rapid failure of fast axonal transport as anterogradely moving organelles vacate the axon in a proximo-distal direction, and retrogradely moving organelles vacate it in the opposite direction. We used CD1 and BALB/c mice and the Wallerian degeneration-resistant mutant C57BL/Ola. Sciatic nerves were cut high in the thigh; at various times up to 8 days later nerves were removed from the animal and individual myelinated axons from the segment distal to the cut were examined by video light microscopy to detect rapid organelle transport. Bidirectional fast organelle transport did decrease in amount with time but not nearly as rapidly as predicted, and anterograde and retrograde organelle velocities remained normal through time. In the C57BL/Ola mouse some structurally preserved axons contained organelles that transported at normal velocities in the anterograde and retrograde directions for as long as 8 days after axotomy. To test one of the possible origins of transported organelles in long-surviving axons we examined organelle transport very close to narrow lesions in axons bathed in a medium compatible with intracellular function. No organelles crossed the lesion but bidirectional organelle transport took place proximal and distal to the lesion; the amounts were compatible with the interpretation that ∼30% of organelles reversed transport direction on either side of the lesion. We propose that at least some of the organelles that undergo persistent transport in axons isolated from their cell bodies shuttle back and forth between the ends of the isolated segment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1460-9568.1993.tb00967.x
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  • 10
    Electronic Resource
    Electronic Resource
    LINE CURRENT FILTERING OF FIXED-LOOP TRANSIENT ELECTROMAGNETIC DATA (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 41 (1993), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: The VLF filtering technique of Karous and Hjelt has been applied to fixed-loop step-response transient electromagnetic data. This allows the data measured in each channel to be converted to an equivalent current-density pseudosection.For a conductive half-space, the maximum value of the equivalent current density starts near the transmitter loop and migrates outwards as a function of delay time. The rate of migration tends to increase as a function of delay time, with the increase being faster for a surficial conductive layer than it is for a half-space.Theoretical and field examples show that the currents tend to be more persistent in the relatively conductive areas, so that a pseudosection which is the average of the current densities at all delay times will highlight the more conductive zones.In resistive ground, it is not so critical to average the pseudosections as a particular delay time may give a better idea of the conductivity structure. For example, the latest possible delay time will reveal the most conductive features.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1993.tb00893.x
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