Xem 1-15 trên 15 kết quả Human dust
  • Introduction: Phencyclidine (PCP) ( Fig. 8.1), a synthetic arylcyclohexylamine hallucinogen, had been first applied as an anaesthetic to animals and then to humans for a short period. PCP is known by street names of “angel dust” and “crystal”. Illicit use of PCP first appeared during mid-1960s along the West Coast, and then peaked in the United States in 1979; illicit PCP use declined by 1992. However, daily use of PCP has remained stable among young school seniors over the past decade; PCP is thus being an important drug of abuse [1–3].

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  • Drawing people and figure art is exciting and challenging in any medium in this short art lesson we will produce a fairly small rendering of the female nude in vine charcoal. Charcoal is typically a medium to be loved or loathed. In an instant it can create those rich blacks that any graphite artist will envy, having squandered hours to achieve the same result. However, there comes a price, and that price is dust.

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  • Airborne suspended particulate matter can be of primary origin, i.e. emitted directly into the atmosphere or of secondary origin, i.e. formed in the atmosphere from gaseous species by either homogeneous or heterogeneous chemical reactions. Due to these different emission sources, particles have different chemical composition and size distributions. Depending on their size, particles have a different potential to be transported over either long or short distances [1]. Primary particles can be produced from either natural or anthropogenic sources.

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  • Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học Critical Care giúp cho các bạn có thêm kiến thức về ngành y học đề tài: House dust mite major allergens Der p 1 and Der p 5 activate human airway-derived epithelial cells by protease-dependent and protease-independent mechanisms...

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  • Tham khảo sách 'nerves and common sense', y tế - sức khoẻ, y học thường thức phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học 'Respiratory Research cung cấp cho các bạn kiến thức về ngành y đề tài:"Interleukin-17A mRNA and protein expression within cells from the human bronchoalveolar space after exposure to organic dust...

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  • In January 2004, President George W. Bush announced new elements of the national space policy by issuing the Vision for Space Exploration (VSE). The new policy set out goals for NASA, including that of exploring the “solar system and beyond” with human and robotic missions—specifically, to “extend human presence across the solar system, starting with a human return to the Moon by the year 2020.” In the year that followed, NASA created the Exploration Systems Mission Directorate (ESMD) as the primary agent for the development of the exploration program.

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  • The lungs are the main route for dust entering the human body. Dust deposition in the pulmonary system varies considerably according to the granulometry of ultrafine dusts and their airborne behaviour. Normally, for coarser dusts encountered in work environments, the proportion of dusts deposited in the alveolar region increases as particle diameter decreases, reaching a maximum value of around 20% for 3-micrometre particles. This percentage then diminishes gradually.

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  • Perhaps one day the Beltsville Agricultural Research Center will stumble upon the dust’s value for growing bigger and healthier soil organism populations, crops, forests—even a fading human race. Someone, perhaps the U.S. Congress, should probably inform them immediately, however. John Hamaker and this writer have tried at length to communicate with many USDA people, including the Secretary and Assistant Secretary of Agriculture, the Chief of the Forest Service.

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  • Besides the blowing dust and the heavenly bodies, little else moves on the Martian landscape. This lack of movement might seem to be strangest of all, for we humans are used to motion. Almost from birth, infants follow motion with their eyes, and from then on we are continually aware of things moving about, starting, stopping, turning, bouncing. On earth we see liquids flowing, people moving, and the wind stirring the leaves of trees. Although we can not see them, we know that the very atoms and molecules of matter are continuously in motion. Even mosses and lichens that...

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  • One redundant characteristic of dismantling operations of nuclear facilities is the lack of exhaustive and accurate data relating to the actual state of the facilities. Most of the time the harsh working conditions (heat, dust, radiological contamination...) are rated far too severe for human workers to carry out the work. As a consequence robots are set to take over from human staff. It is necessary to use flexible, powerful and remotely-operated manipulator arms that are fitted with specially-designed processes and tools for cutting, handling and cleaning-up....

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  • How beautiful to see Once more a shepherd of mankind indeed. Who loved his charge, but never loved to lead; One whose meek flock the people joyed to be, Not lured by any cheat of birth, But by his clear-grained human worth, And brave old wisdom of sincerity! They knew that outward grace is dust; They could not choose but trust In that sure-footed mind's unfaltering skill, And supple-tempered will That bent like perfect steel to spring again and thrust. His was no lonely mountain-peak of mind, Thrusting to thin air o'er our cloudy bars, A sea-mark now, now lost in vapors blind; Broad prairie...

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  • Mercury released through sewage plants and storm sewers often contaminates the sediments of lakes and rivers on a local scale. However, most of the human-generated mercury that enters the aquatic system is deposited through the atmosphere in rain, snow or attached to small dust particles. Mercury also enters lakes directly from natural geologic sources. In lakes that have been created by hydro dams, very high levels of mercury are often found as a result of natural bacterial processes that become greatly accelerated by the flooding of land and decomposition of vegetation.

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  • The European Union’s CAREX database of occupational exposures to carcinogens estimated that in the early 1990s 22-24 million workers in the then 15 EU member states were exposed to carcinogens classified as group 1 by the International Agency for Research on Cancer – those known to cause cancer in humans. Overall, 32 million workers, 23 per cent of the working population, had workplace exposures associated by the CAREX database with an occupational cancer risk.

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  • The human body has various defence mechanisms to eliminate these undesirable foreign objects. Two processes are involved: chemical dissolution for soluble particles and physical translocation, i.e., transport from one place to another, for insoluble or low-solubility particles. Soluble ultrafine dusts will act at the solubilization site and will not be discussed here, since the effects are highly variable depending on the dust composition and identical to those of larger dusts which are also solubilized.

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