Bone Marrow Mesenchymal Stem Cell and Vein Conduit on Sciatic Nerve Repair in Rats
Kamal Seyed ForoutanAli KhodarahmiHootan AlaviSepehr PedramMohamadreza Baghaban EslaminejadSima Bordbar
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Abstract:
Peripheral nerve repair with sufficient functional recovery is an important issue in reconstructive surgery. Stem cells have attracted extensive research interest in recent years.The purpose of this study was to compare the vein conduit technique, with and without the addition of mesenchymal stem cells in gap-less nerve injury repair in rats.In this study, 36 Wistar rats were randomly allocated to three groups: In the first group, nerve repair was performed with simple neurorrhaphy (control group), in the second group, nerve repair was done with vein conduit over site (vein conduit group) and in the third group, bone marrow stem cells were instilled into the vein conduit (stem cell group) after nerve repair with vein conduit over site. Six weeks after the intervention, the sciatic function index, electrophysiological study and histological examination were performed.All animals tolerated the surgical procedures and survived well. The sciatic function index and latency were significantly improved in the vein conduit (P = 0.04 and 0.03, respectively) and stem cell group (P = 0.02 and 0.03, respectively) compared with the control group. No significant difference was observed in sciatic function and latency between the vein conduit and stem-cell groups. Moreover, histological analysis showed no significant difference in regenerative density between these two groups.The results of this study showed that the meticulous microsurgical nerve repair, which was performed using the vein tubulization induced significantly better sciatic nerve regeneration. However, the addition of bone marrow mesenchymal stem cell to vein conduit failed to promote any significant changes in regeneration outcome.Keywords:
Electrical conduit
Various comparison between siphon outlet conduit and straight outlet conduit,which are applied to a vertical installed axial pump,is completed and the following conclusions are obtained:①Under the condition of lower lift head,the hydraulic loss of the siphon outlet conduit is obviously less than that of the straight outlet conduit;②Manner of water current cut off for the siphon outlet conduit is very simple,reliable and economical,and that for the straight outlet conduit can not compare with it at all;③Under the condition of water levels to meet the requirement of siphon outlet conduit,to adopt the siphon outlet conduit is more reliable,more economical and more reasonable than to adopt the straight outlet conduit;④More attention should be highly paid to the selection for the type of the outlet conduit of a vertical installed axial pump system.
Electrical conduit
Siphon (mollusc)
Lift (data mining)
Hydraulic head
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Filled conduit is adopted as an example to analyze the finite elements of its structure by ANSYS program. The distributed law of the annular stress of conduit is analyzed and it is pointed out that the conduit top, bottom and side are the key conduit sections. Meanwhile, the results of ANSYS analysis are compared with those of structural mechanics and BEM method. At the same time, the deformation of backfilled earth around conduit is analyzed and compared with Anson Marston's theory.
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Electrical conduit
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The construction of a new optical fiber cable communication system involves the costly operation of installing the cables underground, and, in addition, such installation work is subject to numerous regulations. It is therefore preferable, to incorporate new optical fiber cables within existing conduit, into which power cable has already been installed. However, if any collapse or blockage has occurred within the existing power cable conduit, this may make the inclusion of optical fiber cables impracticable. Therefore, it is necessary to have a device which is capable of inspecting the condition inside of the existing power cable conduit, prior to the optical fiber cables being installed. Tokyo Electric Power Company and Fujikura Ltd. have jointly developed the self-advancing conduit inspection robot, and the 'small conduit after-laying method' for including a small conduit for optical fiber cables, within an existing power cable conduit. The authors describe the robot and experience with it in practice. >
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Optical fiber cable
Power cable
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Abstract : This report presents the results obtained by CERL over the past 3 years under its investigation of the shielding properties on conduit systems, conduit-related hardware, and the effects of improper field assembly on the shielding of conduit systems. The measurements were made by injecting EMP-type current pulses onto test conduits and measuring the signal picked up on a sense wire inside the conduit. Results are presented for the measurement of both diffusion and leakage signals. The diffusion signal provides a base line for the conduit shielding since it is the optimum shielding obtainable for a given size and material of conduit. The leakage signals represent a degradation of the conduit shielding due to the insertion of conduit hardware required to assemble the conduit runs, or to the improper assembly of the conduit system. Included in the leakage study were various hardware items including couplings, unions, conduits of various sizes, flexible conduit, condulets, lock nuts, threaded hubs, and a variety of condulet gaskets. In addition, the effects of thread corrosion, use of different conductive compounds, various methods of compound application, welding near couplings, and the inadequate tightening of threaded joints were evaluated. The greatest single factor in the degradation of the shielding effectiveness of conduit assemblies was the inadequate tightening of conduit joints.
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Leakage (economics)
Gasket
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The basic structural analysis of filled conduit was done with the ANSYS program. The basic process includes building of model, applying of boundary condition and loads, solving of model and analysis of result. The distributed law of annular stress of conduit was done. This paper pointed that the sections of conduit top, conduit bottom and conduit side were the key sections. The stress of conduit of ANSYS analysis method was compared with The Structural Method and BEM Method. At the same time, the deformation of backfilled earth around conduit was done and compared to the theory of Anson Marston.
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Electrical conduit
Great saphenous vein
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This report presents the results obtained by CERL over the past 3 years under its investigation of the shielding properties on conduit systems, conduit-related hardware, and the effects of improper field assembly on the shielding of conduit systems. The measurements were made by injecting EMP-type current pulses onto test conduits and measuring the signal picked up on a sense wire inside the conduit. Results are presented for the measurement of both diffusion and leakage signals. The diffusion signal provides a base line for the conduit shielding since it is the optimum shielding obtainable for a given size and material of conduit. The leakage signals represent a degradation of the conduit shielding due to the insertion of conduit hardware required to assemble the conduit runs, or to the improper assembly of the conduit system. Included in the leakage study were various hardware items including couplings, unions, conduits of various sizes, flexible conduit, condulets, lock nuts, threaded hubs, and a variety of condulet gaskets. In addition, the effects of thread corrosion, use of different conductive compounds, various methods of compound application, welding near couplings, and the inadequate tightening of threaded joints were evaluated. The greatest single factor in the degradation of themore » shielding effectiveness of conduit assemblies was the inadequate tightening of conduit joints. (GRA)« less
Electrical conduit
Gasket
Leakage (economics)
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The construction of a new optical fiber cable communication system involves the costly operation of installing the cables underground, and, in addition, such installation work is subject to numerous regulations. It is therefore preferable, to incorporate new optical fiber cables within existing conduit, into which power cable has already been installed. However, if any collapse or blockage has occurred within the existing power cable conduit, this may make the inclusion of optical fiber cables impracticable. Therefore, it is necessary to have a device which is capable of inspecting the condition inside of the existing power cable conduit, prior to the optical fiber cables being installed. Tokyo Electric Power Company and Fujikura Ltd. have jointly developed the self-advancing conduit inspection robot, and the 'small conduit after-laying method' for including a small conduit for optical fiber cables, within an existing power cable conduit. The authors describe the robot and experience with it in practice. >
Electrical conduit
Installation
Optical fiber cable
Power cable
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