Workday
Mostrando 13-24 de 26 artigos, teses e dissertações.
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13. A redução do trabalho vivo e a tese do fim da centralidade do trabalho em schaff e gorz : uma critica marxista
In this work are diseussed some propositions regarding theend of labor centrality in modem capitalism through the analysis of the writings of two main supporters of this stream: Adam Sehaff and Andre Gorz. These authors defend that, due to the teehnological improvements along the past decades, the historical working elass produetion and, therefore, working e
Publicado em: 2002
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14. Seringueiros da Amazônia: sobreviventes da fartura. / Rubbers tappers of Amazônia: survivors of plenty.
This research was carried out in the Reservista Extrativista do Rio Ouro Preto, in the Municipality of Gujará-Mirim, in the north east of the State of Rondônia. The Pacaás Novos River is situated at a point after a two-hour motor boat trip up the Mamoré River, where the Reserva Extrativista de Gujará-Mirim starts. A three-hour trip further up the Mamor�
Publicado em: 2002
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15. Efficiency and daily work effort in sugar cane cutters.
Productivity (metric tons (tonnes)/day), efficiency (kg cane cut/litre Vo2), and effort (percent Vo2 max sustained during an 8-hour workday) have been measured in 54 Colombian sugar cane cutters. In workers who sustained less than 40% Vo2 max during the workday, the effort expended was related to productivity (4 = 0-71) but efficiency and productivity were n
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16. Acute effects of ELF electromagnetic fields: a field study of linesmen working with 400 kV power lines.
The aim of the study was to investigate the possible acute effects of exposure to electric and magnetic fields. Twenty six experienced linesmen, aged 25 to 52, were studied during two working days while performing a simulated routine inspection of insulators on steel poles of a 400 kV power line. During one of the working days the inspection was performed on
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17. Dimethylethylamine in mould core manufacturing: exposure, metabolism, and biological monitoring.
The exposure and metabolism of dimethylethylamine (DMEA) was studied in 12 mould core makers in four different foundries using the Ashland cold box technique. The mean time weighted average (TWA) full work shift DMEA exposure concentration was 3.7 mg/m3. Inhaled DMEA was excreted into urine as the original amine and as its metabolite dimethylethylamine-N-oxi
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18. Exposure dependent increase in DNA single strand breaks in leucocytes from workers exposed to low concentrations of styrene.
Single strand breaks in DNA were monitored in leucocytes from 17 men occupationally exposed to styrene. Personal air monitoring was carried out during one workday with two diffusion samplers and a portable photoionisation detector placed in the breathing zone. Exposure to styrene was also monitored by analysing styrene in blood and urine and mandelic acid in
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19. Stainless steel manual metal arc welding fumes in rats.
Forty two male Wistar rats were exposed to manual metal arc (MMA) stainless steel (SS) welding fumes generated by an automatic welding device for "nose-only" exposure. The exposure simulated an actual MMA/SS welding environment as closely as possible. For the retention study, the duration of exposure was one hour per workday for one, two, three, of four week
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20. Excretion of 1,2,4-benzenetriol in the urine of workers exposed to benzene.
Urine samples were collected from 152 workers (64 men, 88 women) who had been exposed to benzene, 53 workers (men only) exposed to a mixture of benzene and toluene, and 213 non-exposed controls (113 men, 100 women). The samples were analysed for 1,2,4-benzentriol (a minor metabolite of benzene) by high performance liquid chromatography. The time weighted ave
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21. Comparison of direct-plating and enrichment methods for isolation of Vibrio cholerae from diarrhea patients.
A direct-plating method on thiosulfate citrate bile salts sucrose agar (DIR-TCBS) in conjunction with enrichment in alkaline peptone water (APW) incubated for both 6 h and 24 h followed by subculture onto TCBS (APW6h-TCBS and APW24h-TCBS, respectively) was performed on 16,034 rectal swab samples for isolating Vibrio cholerae. A total of 2,932 (18.3%) rectal
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22. Increase in neuropsychiatric symptoms after occupational exposure to low levels of styrene.
The results of this study suggest that exposure to styrene below the current Swedish permissible exposure limit of 20 ppm induces neurotoxic effects expressed as an increased number of neuropsychiatric symptoms. Twenty men exposed to styrene at a plastics factory participated. The reference group included 20 non-exposed men matched for age, working schedule,
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23. Exposure to hydrogen sulphide and respiratory function.
A study was carried out to assess possible effects of low concentrations of hydrogen sulphide on respiratory function. The cohort comprised 26 male pulp mill workers (mean age 40.3, range 22-60 years) with a daily exposure to hydrogen sulphide in the workplace, and 10 volunteers, who had asthma (three men, mean age 40.7, range 33 to 50 years, and seven women
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24. Acute neurobehavioural effects of toluene.
An acute inhalation chamber study of 42 college students was performed to investigate the relation between exposure to 0, 75, and 150 ppm of toluene and changes in central nervous system function and symptoms. Paid subjects were exposed for seven hours over three days. Verbal and visual short term memory (Sternberg, digit span, Benton, pattern memory); perce