1,721,052 research outputs found
The regenerating muscle as an experimental model for the study of factors which affect muscle differentiation or adaptation
No full textBupivacaine-induced regeneration was studied in the rat soleus muscle in the presence or absence
of innervation, in the presence of tetrodotoxin (TTX)-induced block of nerve impulse
conduction, and/or in the presence of vinblastine-induced block of nerve axoplasmic flow.
Part of experiments were carried out on tenotomized muscles. Regenerated muscles were
analysed for myosin heavy chain (MHC) composition 14 days after bupivacaine injection. In
TTX-paralysed-regenerated muscles type 1 and type 2A MHC isoforms were not expressed.
In denervated-regenerated muscles type 1 isoform was lacking, while all fast isoforms (2A,
2B, 2X) were expressed. Tenotomy alone increased type 2A fibres, but did not modify the effects
of surgical or functional denervation. Vinblastine-block caused up-regulation of 2A isoform
expression in non-tenotomized muscles. The results confirm the essential role played by
neuromotor impulses for type 1 and type 2A isoform expression. They also support the
hypothesis that axoplasmic flow carries some chemical factor inhibiting 2A isoform expression
Generazione di impulsi solitonici stabili in una cavita' non risonante in fibra all'erbio
No full textSoliton generation in the normal dispersion regime from a continuously frequency shifted fiber laser
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Age-related changes in electrophysiological properties of fast and slow rat skeletal muscles.
No full textDesign optimization of waveguide bends in photonic crystals
No full textIn this paper, a fast and robust optimization scheme is presented and applied to the optimal design of planar photonic crystals. It is based on a parallel hybrid (stochastic-deterministic) algorithm coupled to a semi-analytic solution of full Maxwell equations by multiple scattering technique. The numerical results of the optimal design of different waveguide bends are presented
Bandwidth Limits of Soliton Transmission with Sliding Filters
No full textThe limitations to the maximum transmission capacity in a long distance soliton transmission system with sliding guiding filters are studied. Shown is that sliding the center frequency of the filters may substantially stabilize the soliton even in the case of strong resonance overlap with the radiation that originates from the periodic amplification. This permits a considerable reduction of both the minimum pulse width and pulse-to-pulse separation in the transmission
DEVICE AND METHOD FOR COMPENSATING POLARIZATION MODE DISPERSION IN AN OPTICAL COMMUNICATION SYSTEM
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