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101.
Pawlaczyk-?uszczyńska M Dudarewicz A Zamojska M Sliwinska-Kowalska M 《International journal of occupational safety and ergonomics》2011,17(3):255-269
This study aimed to assess exposure to sound and the risk of noise-induced hearing loss (NIHL) in orchestral musicians. Sound pressure level was measured in 1 opera and 3 symphony orchestras; questionnaires were filled in. On the basis of that data, the risk of NIHL was assessed according to Standard No. ISO 1999:1990. Classical orchestral musicians are usually exposed to sound at equivalent continuous A-weighted sound pressure levels of 81?90 dB (10th?90th percentiles), for 20?45 h (10th?90th percentiles) per week. Occupational exposure to such sound levels over 40 years of employment might cause hearing loss (expressed as a mean hearing threshold level at 2, 3, 4 kHz exceeding 35 dB) of up to 26%. Playing the horn, trumpet, tuba and percussion carries the highest risk (over 20%). 相似文献
102.
Jinkai Xue Seyed Hesam-Aldin Samaei Jianfei Chen Ariana Doucet Kelvin Tsun Wai Ng 《Frontiers of Environmental Science & Engineering》2022,16(5):58
103.
104.
Petr Babula Pavel Ryant Vojtech Adam Josef Zehnalek Ladislav Havel Rene Kizek 《Environmental Chemistry Letters》2009,7(4):353-361
Fertilization by phosphorus and also nitrogen fertilizers are the main source of cadmium soil contamination. Cadmium is relatively easily taken up by plants and then consequently enters their food chain. We investigated whether the cultivation medium with or without sulphates supplement affects the synthesis of protective low molecular mass thiols such as cysteine, reduced glutathione, oxidized glutathione and phytochelatins (PC2) in Dionaea muscipula treated with cadmium(II) ions at 0, 1, 5, 10, 25, 50, 100, 250, 500 and 1,000 μM for 6 weeks. The plants cultivated in the presence of sulphates showed higher cadmium tolerance due to faster growth and lesser number of necrosis hallmarks. Further, we utilized liquid chromatography with electrochemical detection for determination of the thiols in plant tissues. In the case of the plants cultivated on media supplemented with sulphates for 6 weeks the average PC2 level was 2,830 ng/g of fresh weight (FW). However, the plants cultivated on media without the presence of sulphates on average contained 1,160 ng PC2/g FW. Results obtained showed the positive effect of sulphur supplementation in cadmium detoxification processes in plants. In addition to thiol content, we also determined level of majority secondary metabolite of Venus flytrap, naphthoquinone plumbagin. Generally, the presence of sulphates in the media enhanced the protective mechanism and did not affect directly the synthesis of secondary metabolite plumbagin. 相似文献
105.
描述了香港新机场侯机厅的基本几何结构特点,在没有扰乱机场的正常运作的情况下,对侯机厅的火灾安全分区进行了实地考查,对候机厅内的零售店发生轰燃所需的最小热释放速率进行了调查。 相似文献
106.
107.
The dynamics of arsenic in four paddy fields in the Bengal delta 总被引:4,自引:0,他引:4
Stroud JL Norton GJ Islam MR Dasgupta T White RP Price AH Meharg AA McGrath SP Zhao FJ 《Environmental pollution (Barking, Essex : 1987)》2011,159(4):947-953
Irrigation with arsenic contaminated groundwater in the Bengal Delta may lead to As accumulation in the soil and rice grain. The dynamics of As concentration and speciation in paddy fields during dry season (boro) rice cultivation were investigated at 4 sites in Bangladesh and West Bengal, India. Three sites which were irrigated with high As groundwater had elevated As concentrations in the soils, showing a significant gradient from the irrigation inlet across the field. Arsenic concentration and speciation in soil pore water varied temporally and spatially; higher As concentrations were associated with an increasing percentage of arsenite, indicating a reductive mobilization. Concentrations of As in rice grain varied by 2-7 fold within individual fields and were poorly related with the soil As concentration. A field site employing alternating flooded-dry irrigation produced the lowest range of grain As concentration, suggesting a lower soil As availability caused by periodic aerobic conditions. 相似文献
108.
Mikołaj Urbanowski Paweł Socha Paweł Dąbrowski Wioletta Nowaczewska Anna Sadakierska-Chudy Tadeusz Dobosz Krzysztof Stefaniak Adam Nadachowski 《Die Naturwissenschaften》2010,97(4):411-415
An upper second permanent molar from a human was found alongside numerous tools of the Micoquian tradition and was excavated
in Stajnia Cave, which is located over 100 km North of the Carpathian Mountains in southern Poland. The age of these finds
has been established within a time-span of late Saalian to early Weichselian, most likely to OIS 5c or 5a, according to the
palaeontological, geological, archaeological and absolute dating of the layer from which they were obtained. An examination
of the morphology of the human molar indicates that this tooth exhibits many traits frequently occurring in Neanderthal upper
molars. Although the occurrence of derived Neanderthal traits in the Stajnia molar cannot be firmly established because of
degradation of its cusps, the presence of the above-mentioned features allows the assertion that this tooth belonged to a
Neanderthal. The age of the Stajnia tooth and the archaeological context of this find also indicate that this molar is of
Neanderthal origin. 相似文献
109.
M. A. A. Pinheiro L. F. A. Duarte T. R. Toledo M. L. Adam R. A. Torres 《Environmental monitoring and assessment》2013,185(10):8273-8285
In Brazil, the state of São Paulo contains both preserved areas (Juréia-Itatins Ecological Station) and extremely impacted ones (Cubatão Municipality). This study evaluated the concentrations of five metals (Cu, Cd, Cr, Pb, and Hg) in two mangroves with different levels of anthropogenic impact and the apparent genotoxicity to Ucides cordatus. Water and sediment samples were obtained, and metal concentrations were determined with an atomic absorption spectrophotometer. The genotoxic impact was quantified based on the number of micronucleated cells per 1,000 analyzed (MN‰), using hemolymph slides stained with Giemsa. Metal concentrations in water were below the detection limit, except for lead, although no significant difference was observed between the areas (P?>?0.05). Sediment from Cubatão had higher concentrations of Cd, Pb, Cr, and Cu than sediment from Juréia-Itatins (P?<?0.05), but no significant differences in metal concentrations were detected among depth strata of the sediment (P?>?0.05). Crabs from Cubatão had a 2.6 times higher mean frequency of micronucleated cells (5.2?±?1.8 MN‰) than those from Juréia-Itatins (2.0?±?1.0 MN‰; P?<?0.0001). The more-polluted conditions found in the mangrove sediments of Cubatão were reflected in the micronucleus assay, demonstrating their genotoxic effect; however, genetic damage should be attributed to a synergistic effect with other kinds of pollutants previously recorded in different environments of Cubatão. U. cordatus proved to be an excellent bioindicator of mangrove pollution. This study established, for the first time, the normal frequency of MN‰ in a population of this species within an ecological station. 相似文献
110.
In the first part of the article, the column and the bag experiments concerning removal of polycyclic aromatic hydrocarbons (PAHs) and nonpolar oil (NPO) from tunnel wash waters using organic sorbent materials have been described. This part presents the results of removal of toxic metals. The metals of concern (Al, As, Cd, Cr, Cu, Fe, Pb, Mo, Ni, and Zn) were selected based on the priority toxicant pollutants defined in surface water quality criteria. Concentrations of these metals in the collected effluent... 相似文献