نتایج جستجو برای: effects 85 or 90 dba
تعداد نتایج: 4744575 فیلتر نتایج به سال:
DBA/1 (audiogenic seizure-susceptible) and A/Jax (seizure-resistant) mice were subjected to bell-ringing sound and an approximate 80-90 per cent effective carcinogen ic dose of 20-methylcholanthrene and observed for time of tumor induction and ulti mate fate. There was a delay in the time of tumor induction (latent period) in DBA/1 mice subjected to audio stimulus as compared with DBA/1 control...
Exposure estimates were required to support an epidemiological study of occupational noise and cardiovascular disease. The study cohort consisted of male industrial workers employed at two nuclear facilities in England between 1945 and 1999 (n=2412). Historical noise exposure data were available from 6850 sound pressure measurements collected since 1965. Additional information was obtained from...
BACKGROUND Intensive care units (ICUs) in human hospitals are consistently noisy environments with sound levels sufficient to substantially decrease sleep quality. Sound levels in veterinary ICUs have not been studied previously, but environmental sound has been shown to alter activity in healthy dogs. HYPOTHESIS Veterinary ICUs, like those in human medicine, will exceed international guideli...
El objetivo de esta investigación radica en: identificar los factores riesgo que pueden afectar la salud auditiva del personal CCICEV Escuela Politécnica Nacional, evaluar riesgos y proponer las medidas control permitan el cumplimiento normativa vigente respecto a exposición laboral ruido en Ecuador. En CCICEV, se llegó determinar existe sobreexposición ruido, ya luego realizar evaluación físic...
The aim of this study was to determine the daily noise exposure levels in black tea processing factories and evaluate its effects on employees' occupational health safety. In study, sound pressure level dBA values were measured at ear employees each production unit three operating Artvin Province. These where measurements made consist withering, curling, oxidation, drying (boiler stove) classif...
برای تحقق اهداف برنامههای توسعه کشور، هماهنگ نمودن اهداف ملی با واقعیتهای منطقه‌ای امری اجتناب‌ناپذیر می‌باشد. بر همین اساس، تخصیص منابع باید بر اساس توانمندی ها و مزیت‌های نسبی مناطق صورت پذیرد. لذا، هر منطقه متناسب با ویژگیهای خاص خود نیازمند برنامههای ویژه‌ای است که لازمه هرگونه اقدامی در این زمینه نیز شناسایی وضعیت گذشته و موجود مناطق مختلف بر اساس روشهای علمی مناسب می‌باشد. مط...
Diamond Blackfan anemia (DBA; OMIM105650) is a rare congenital anemia with erythroid (Ery) hypoplasia, developmental abnormalities, growth retardation, and an increased risk of malignancy. About half of DBA cases are caused by heterozygous mutations in genes encoding ribosomal proteins, leading to haploinsufficiency or, less frequently, dominant-negative effects with consequent defects in ribos...
The DBA/2J strain is a model for early-onset, progressive hearing loss in humans, as confirmed in the present study. DBA/2J mice showed progression of hearing loss to low-frequency sounds from ultrasonic-frequency sounds and profound hearing loss at all frequencies before 7 months of age. It is known that the early-onset hearing loss of DBA/2J mice is caused by affects in the ahl (Cdh23(ahl)) a...
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