ERGONOMICS |
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Ergonomics (or human factors) is the scientific discipline concerned with the understanding of interactions among humans and other elements of a system, and the profession that applies theory, principles, data, and methods to design in order to optimize human well-being and overall system performance (definition adopted by the International Ergonomics Association in 2000).
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OPHTHALMOLOGY |
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Ophthalmology is the branch of medicine which deals with the diseases of the eye and their treatment. The word ophthalmology comes from the Greek roots ophthalmos meaning eye and logos meaning word; ophthalmology literally means "the science of eyes." As a discipline it applies to animal eyes also, since the differences from human practice are surprisingly minor and are related mainly to differences in anatomy or prevalence, not differences in disease processes. By convention the term ophthalmologist is more restricted and implies a medically trained specialist. Since ophthalmologists perform operations on eyes, they are generally categorized as surgeons.
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ORTHOPEDICS |
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Orthopedics - The branch of medicine that deals with the prevention or correction of injuries or disorders of the skeletal system and associated muscles, joints, and ligaments. Orthopedic surgery or orthopedics (Commonwealth: "orthopaedics") is the branch of surgery concerned with acute, chronic, traumatic, and recurrent injuries and other disorders of the musculoskeletal system, its muscular and bone parts. Apart from the mechanical considerations, it also is concerned with the pathology, genetics, intrinsic, extrinsic, and biomechanical factors involved.
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POLLUTION |
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Pollution is the release of environmental contaminants. Carbon monoxide, sulfur dioxide, chlorofluorocarbons (CFCs), and nitrogen oxides produced by industry and motor vehicles are common air pollutants. Sunlight converts nitrogen oxides and hydrocarbons to ozone or smog. Water pollutants may consist of a wide range of organic and inorganic chemicals such as heavy metals, petrochemicals, chloroform, and bacteria. Water pollution may also occur in the form of thermal pollution and dissolved oxygen depletion. Soil contamination is an important aspect of environmental pollution; this phenomenon occurs when chemicals are released by spill or underground storage tank leakage. Among the most significant soil contaminants are hydrocarbons, heavy metals, MTBE, herbicides, pesticides and chlorinated hydrocarbons. The U.S., Russia, China and Japan are the world leaders in air pollution emissions; however, Canada is the number two country on a per capita basis.
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SURGERY - ORTHOPEDIC |
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Orthopedic surgery or orthopedics (Commonwealth: "orthopaedics") is the branch of surgery concerned with acute, chronic, traumatic, and recurrent injuries and other disorders of the musculoskeletal system, its muscular and bone parts. Apart from the mechanical considerations, it also is concerned with the pathology, genetics, intrinsic, extrinsic, and biomechanical factors involved.
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