Glass Fibre
Mostrando 25-36 de 50 artigos, teses e dissertações.
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25. Lung cancer among glass fibre production workers: a case-control study.
A cohort study among 4734 employees at an English glass fibre plant previously reported no excess of lung cancer mortality either overall or when examined in broad occupational groups. To investigate occupation in more detail, and to test the hypothesis that processes producing or using finer (respirable) fibres may be related to a higher risk of lung cancer
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26. Formation of 8-hydroxydeoxyguanosine by asbestos and man made mineral fibres.
Samples of rockwool and glass fibre were compared with chrysotile fibres for their capacity to hydroxylate 2-deoxyguanosine to 8-hydroxydeoxyguanosine, a reaction that is mediated by formation of hydroxyl radicals. All three fibres produced 8-hydroxydeoxyguanosine in the absence of H2O2. The chrysotile fibres were most potent and produced about ten times mor
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27. Dermatoses in the Manufacture of Glass Fibre
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28. Glass fibres: absence of pulmonary hazard in production workers
Hill, J. W., Whitehead, W. S., Cameron, J. D., and Hedgecock, G. A. (1973).British Journal of Industrial Medicine,30, 174-179. Glass fibres: absence of pulmonary hazard in production workers. Seventy fibreglass workers with a mean of 19·85 years in the industry are compared with a control group having no exposure to glass fibre but otherwise matched for age
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29. Foreign body granuloma of the penis caused by occupational glass fibre exposure.
We report a patient who presented with the suspected diagnosis of syphilis. Clinical findings included a penile ulcer, positive history of syphilis more than 20 years ago, and positive syphilis serology (TPHA, FTA-Abs). A biopsy showed a plasma-cell rich inflammation with granuloma formation. Since a birefractory structure was observed in the biopsy possibly
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30. Mortality experience of glass fibre workers.
A historical prospective mortality study was conducted at an insulating wool plant in Ontario, Canada, on 2576 men who had worked for at least 90 days and were employed between 1955 and 1977. Eighty eight deaths were found in the 97.2% of men traced. Mortality was compared by the person-years method with that of the Ontario population. Measurements taken sin
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31. Fibrogenic effect of wollastonite compared with asbestos dust and dusts containing quartz.
The distribution of length and diameter and the aspect ratio of crocidolite asbestos, a mineral substitute for asbestos (wollastonite), a manmade mineral fibre (glass wool), and synthetic fibres (polypropylene and polyacrylonitrite) were determined by light microscopy with phase contrast and, for crocidolite, also with transmission electron microscopy. The s
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32. The mechanical properties of ciliary bundles of turtle cochlear hair cells.
The mechanical behaviour of the ciliary bundles of hair cells in the turtle cochlea was examined by deflecting them with flexible glass fibres of known compliance during simultaneous intracellular recording of the cell's membrane potential. Bundle motion was monitored through the attached fibre partially occluding a light beam incident on a photodiode array.
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33. The influence of muscle respiration and glycolysis on surface and intracellular pH in fibres of the rat soleus.
Extracellular pH (pHo) and intracellular pH (pHi) of superficial fibres of the rat soleus muscle were measured in vitro using pH-sensitive glass micro-electrodes. The origin of the pH gradient existing between the bulk phase of extracellular solution and the surface of muscle fibres was investigated. The pHo decreased almost linearly over a distance of 285 m
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34. Interganglionic segregation of distinct vagal afferent fibre phenotypes in guinea-pig airways.
1. The present study addressed the hypothesis that jugular and nodose vagal ganglia contain the somata of functionally and anatomically distinct airway afferent fibres. 2. Anatomical investigations were performed by injecting guinea-pig airways with the neuronal tracer Fast Blue. The animals were killed 7 days later, and the ganglia were removed and immunost
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35. The effect of leakage on micro-electrode measurements of intracellular sodium activity in crab muscle fibres.
The effect of lowering extracellular Na (Nao) on the intracellular Na activity has been measured in single muscle fibres from the crab Carcinus maenas using Na+-sensitive glass micro-electrodes. Measurements have been made with recessed-tip micro-electrodes inserted radially into intact fibres, and with axial electrodes in cannulated fibres. Reducing Nao to
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36. Lateral distribution of sodium and potassium channels in frog skeletal muscle: measurements with a patch-clamp technique.
We describe a method for recording Na+ and K+ currents (INa and IK) from small, voltage-clamped patches of sarcolemma by means of fire-polished glass micropipettes of 7-15 microns tip diameter. Recordings can be made successively from many areas of one fibre. On a given fibre, the amplitudes of INa and IK varied from point to point. Maximum Na+ current densi