The conduction of iodide ions in gel polymer electrolytes and the performance of dye sensitized solar cells containing such an electrolyte can be enhanced by incorporating a salt having a bulky cation. In this work, polyacrylonitrile (PAN) and Hex 4 N + I¯ based gel electrolytes with ethylene carbonate and propylene carbonate as plasticizers have been studied. The variation of conductivity and molar conductivity with salt concentration has been discussed in order to understand the mechanism of iodide ion conductivity in this system. Out of the various compositions studied, the electrolyte containing 120 % salt with respect to weight of PAN showed the highest conductivity, 2.0 × 10-3 Scm −1 at 25 °C and a glass transition at-102.3 °C. The electrolytes exhibit predominantly ionic behaviour and because of the bulky cation a negligible cationic transport is shown. A quasi-solid-state dye sensitized solar cell was fabricated employing the optimized gel electrolyte. This cell showed an energy conversion efficiency of 3.1 % and a short circuit current density of 8.1 mAcm-2 under irradiation of 1000 Wm-2 .
Entrapment of the median and posterior tibial nerves in the carpal and tarsal tunnels, respectively, in Paget's disease, are described. In each, decompression resulted in a complete relief of sensory symptoms. Factors in the genesis of selective wasting of the thenar pad are outlined.Deformity of hone is a characteristic feature of Paget's disease. This is associated with an alteration in the texture and internal architecture of bone and consists microscopically of bone showing irregular cement lines and crenated o r scalloped edges flanked by osteoclasts. The marrow spaces arc often filled with loosely textured fibrous tissue. Occasionally there may he a laying down of pagetoid bone (pseudocallus), in relation to a diseased vertebral body (Direkze & Milnes 1970). In such states the circumferential of narrowing of the spinal canal leads to a compression of the spinal cord and the nerves in their course within the spinal canal. Deformity of long bones such as the radius or the tibia as a result of Paget's disease may lead to a compression of the median and posterior tibial nerves in their course within the carpal and tarsal tunnels, respectively. This paper reports two such cases. Case historiesCase I . M.W., female aged 68 years, presented with numbness and tingling in thc distribution of the median nerve supply of the right hand of 2 years duration. Her symptoms were made worse by household duties. This 2 year period was punctuated by episodes of excruciating pain confined to the hand lasting 2-3 days, symptoms being usually worse at night. There was no history of neck pain, sensory symptoms referable to the othix-limbs or difficulty with sphincter control.Clinical examination showed a marked deformity of the right wrist, wasting and weakness of the abductor pollicis brevis and impairment of pain and touch in the distribution of the median supply of the right hand. The reflex pattern in the limbs was compatible with cervical spondylosis. The pIantar responses were flexor.Znuestigations. The haemoglobin, sedimentation ratc, plasma proteins and serum calcium were normal. The alkaline phosphatase was 298 ILA. units. Radiology showed Paget's discase of the pelvis and the right radius (Figure 1 ) . The cervical spine showed narrowing of the C5-6 disc space. The skull mas normal. 24'
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