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  • 1
    Electronic Resource
    Electronic Resource
    Embryonic silk gland development in Bombyx: molecular cloning and expression of the Bombyx trachealess gene (1999)
    Springer
    Development genes and evolution 209 (1999), S. 507-514 
    Details
    ISSN: 1432-041X
    Keywords: Key words trachealess ; Silk gland ; Trachea ; Bombyx mori
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  We describe embryonic development of the Bombyx silk gland. To extend the analysis further we isolated a Bombyx counterpart gene ofthe Drosophila trachealess (trh) gene. Bombyx trh encodes a protein of 849 amino acids. When compared with the amino acid sequence of Drosophila trh, the identity of Bombyx bHLH, PAS-A and PAS-B domains is 100%, 97%, and 80%, respectively. Northern blot analysis revealed the presence of a single Bombyx trh transcript of 5.4 kb. We analyzed the expression pattern of the Bombyx trh transcript during embryogenesis by in situ hybridization. Bombyx trh mRNA was first detected in the tracheal primordial cells at around embryonic stage 18. Thereafter levels of Bombyx trh mRNA increased, and the high expression level was maintained until hatching. At embryonic stage 19 the transcript was also detected in the posterior basal region of the labial segment from where the silk gland invaginates. By the blastokinesis stage (around stage 23), the silk gland was lengthened, and, interestingly, the Bombyx trh transcript was restricted to the anterior silk gland. These results suggest that Bombyx trh plays a role in the formation of the trachea and the anterior silk glands.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004270050283
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  • 2
    Electronic Resource
    Electronic Resource
    An intracellular study of neuronal organization in the visual cortex (1974)
    Springer
    Experimental brain research 21 (1974), S. 45-66 
    Details
    ISSN: 1432-1106
    Keywords: Visual cortex ; Efferent cells ; Non-efferent cells ; Synaptic connection ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Neuronal connections in the visual cortex of cat (areas 17 and 18) were studied with intracellular recording and electrical stimulation techniques under Nembutal anaesthesia. Four types of axonal projection were seen; 1. association efferent cells projecting to adjacent cerebral cortex on the ipsilateral side, 2. commissural efferent cells to visual cortex on the contralateral side, 3. corticofugal efferent cells to the ipsilateral lateral geniculate body and superior colliculus, and 4. non-efferent cells whose projection is confined within the visual cortex. Both association and commissural efferent cells were located in layer III, corticofugal efferent cells in layer V and non-efferent cells in layers II–VI. Upon these cells two types of synaptic actions were exerted by the specific visual afferents that originate from the lateral geniculate body; 1. type I, monosynaptic excitation plus disynaptic inhibition and 2. type II, disynaptic excitation plus trisynaptic inhibition. Type I effects were found in layers III–V, and type II in layers II and VI. In the border region between areas 17 and 18 monosynaptic excitation and disynaptic inhibition were produced also by the commissural efferents originating from the contralateral visual cortex. On the basis of these results, a possible neuronal circuitry in the visual cortex is postulated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00234257
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  • 3
    Electronic Resource
    Electronic Resource
    Synaptic excitation of red nucleus neurones by fibres from interpositus nucleus (1970)
    Springer
    Experimental brain research 11 (1970), S. 187-198 
    Details
    ISSN: 1432-1106
    Keywords: Red nucleus ; Interpositus nucleus ; Unitary EPSP
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Electrophysiological properties of the interpositus-rubral transmission were studied in anaesthetized cats. The axons of interpositus neurones were stimulated either at their origin in the interpositus nucleus or at their terminal in the ventrolateral nucleus of the thalamus. Impulses of the interpositus axons produced in the red nucleus neurones excitatory postsynaptic potentials (EPSPs) monosynaptically. As a unique feature, these EPSPs exhibited very little facilitation or depression during double shock or tetanic stimulation. Correspondingly, the unitary EPSPs evoked by the threshold stimulation showed little failure during many successive trials. The number of the interpositus axons converging onto a single red nucleus cell was about 50, when calculated from the ratio of the maximum rising slopes between the unitary and maximal EPSPs evoked from the interpositus nucleus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00234322
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  • 4
    Electronic Resource
    Electronic Resource
    Precentral unit activity related to control of arm movements (1977)
    Springer
    Experimental brain research 29 (1977), S. 85-95 
    Details
    ISSN: 1432-1106
    Keywords: Load compensation ; Motor cortex ; Monkey
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary 1. Precentral neural activity was studied in relation to steady loads in a Cebus monkey trained to make self-paced elbow flexions and extensions into learned target positions in which the arm had to be held steady between movements. The same steady loads were applied in about 15 successive trials. 2. Single unit records were analyzed from 75 task-related precentral cortical cells. Out of 57 activated neurons, 18 reached peak discharge before or at movement onset, 31 after movement onset, and 8 had gradually rising discharge throughout holding and movement. 3. Different steady loads were tested adequately for 52 neurons. Of these 13 displayed a clear increase of the static discharge rate during the hold phase; a weak trend in the same direction was seen in additional 11 neurons. Four neurons appeared to be related to position rather than to load, and 24 neurons did not change their static discharge rate under different loads. 4. Increasing load produced also dynamic changes of firing frequency in 8 neurons: an increase of the peak frequency, a shortening of the rise time to peak, and advanced onset time. Increased peak frequency was positively correlated with increased peak acceleration of the movement. 5. It is likely that these dynamic changes occurring before or shortly after movement onset are programmed and not the consequence of proprioceptive feedback.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00236877
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Evidence for tight coupling of phospholipase activation and Ca^2^+ influx during acrosome reaction of golden hamster spermatozoa
    Amsterdam : Elsevier
    Comparative Biochemistry and Physiology -- Part B: Biochemistry and 95 (1990), S. 635-639 
    Details
    ISSN: 0305-0491
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0305-0491(90)90033-P
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Laboratory tests of excitation and attenuation of coda waves using 2-D models of scattering media
    Amsterdam : Elsevier
    Physics of the Earth and Planetary Interiors 67 (1991), S. 36-47 
    Details
    ISSN: 0031-9201
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0031-9201(91)90058-P
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Trichoharzin, a new polyketide produced by the imperfect fungus Trichoderma harzianum separated from the marine sponge Micale cecilia
    Amsterdam : Elsevier
    Tetrahedron Letters 34 (1993), S. 7925-7928 
    Details
    ISSN: 0040-4039
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0040-4039(00)61513-7
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  • 8
    Electronic Resource
    Electronic Resource
    Book review (1981)
    Springer
    Primates 22 (1981), S. 142-143 
    Details
    ISSN: 0032-8332
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02382567
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    Paper (German National Licenses)
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